feat: Update ci workflow to only work on pushes to main branch and pull requests.

.editorconfig

@@ -0,0 +1,7 @@
+root = true
+
+[*.swift]
+indent_style = space
+indent_size = 2
+tab_width = 2
+trim_trailing_whitespace = true

.gitea/workflows/ci.yaml

@@ -0,0 +1,22 @@
+---
+name: CI
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+
+jobs:
+  test:
+    name: Run Tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Setup Docker buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Run Test
+        run: make test-docker
+      - name: Cleanup.
+        if: always()
+        run: docker compose --file docker/docker-compose-test.yaml down

.gitea/workflows/release.yml

@@ -0,0 +1,68 @@
+#
+name: Create and publish a Docker image
+
+# Configures this workflow to run every time a change is pushed to the branch called `release`.
+on:
+  push:
+    branches: ['release']
+    tags:
+      - '*'
+  workflow_dispatch:
+
+# Defines two custom environment variables for the workflow. These are used for the Container registry domain, and a name for the Docker image that this workflow builds.
+env:
+  REGISTRY: git.housh.dev
+  IMAGE_NAME: ${{ gitea.repository }}
+
+# There is a single job in this workflow. It's configured to run on the latest available version of Ubuntu.
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    # Sets the permissions granted to the `GITHUB_TOKEN` for the actions in this job.
+    permissions:
+      contents: read
+      packages: write
+      attestations: write
+      id-token: write
+      #
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      # Uses the `docker/login-action` action to log in to the Container registry registry using the account and password that will publish the packages. Once published, the packages are scoped to the account defined here.
+      - name: Log in to the Container registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ gitea.actor }}
+          password: ${{ secrets.CONTAINER_TOKEN }}
+      # This step uses [docker/metadata-action](https://github.com/docker/metadata-action#about) to extract tags and labels that will be applied to the specified image. The `id` "meta" allows the output of this step to be referenced in a subsequent step. The `images` value provides the base name for the tags and labels.
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=semver,pattern={{version}}
+            type=sha
+      # This step uses the `docker/build-push-action` action to build the image, based on your repository's `Dockerfile`. If the build succeeds, it pushes the image to GitHub Packages.
+      # It uses the `context` parameter to define the build's context as the set of files located in the specified path. For more information, see "[Usage](https://github.com/docker/build-push-action#usage)" in the README of the `docker/build-push-action` repository.
+      # It uses the `tags` and `labels` parameters to tag and label the image with the output from the "meta" step.
+      - name: Build and push Docker image
+        id: push
+        uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+        with:
+          context: .
+          file: docker/Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+
+      # This step generates an artifact attestation for the image, which is an unforgeable statement about where and how it was built. It increases supply chain security for people who consume the image. For more information, see "[AUTOTITLE](/actions/security-guides/using-artifact-attestations-to-establish-provenance-for-builds)."
+#       - name: Generate artifact attestation
+#         uses: actions/attest-build-provenance@v1
+#         with:
+#           subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME}}
+#           subject-digest: ${{ steps.push.outputs.digest }}
+#           push-to-registry: true
+#           github-token: ${{ secrets.CONTAINER_TOKEN }}

.github/workflows/release.yml

@@ -5,11 +5,14 @@ name: Create and publish a Docker image
 on:
   push:
     branches: ['release']
+    tags:
+      - '*'
+  workflow_dispatch:
 
 # Defines two custom environment variables for the workflow. These are used for the Container registry domain, and a name for the Docker image that this workflow builds.
 env:
   REGISTRY: ghcr.io
-  IMAGE_NAME: swift-mqtt-dewpoint
+  IMAGE_NAME: ${{ github.repository }}
 
 # There is a single job in this workflow. It's configured to run on the latest available version of Ubuntu.
 jobs:
@@ -38,6 +41,10 @@ jobs:
         uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=semver,pattern={{version}}
+            type=sha
       # This step uses the `docker/build-push-action` action to build the image, based on your repository's `Dockerfile`. If the build succeeds, it pushes the image to GitHub Packages.
       # It uses the `context` parameter to define the build's context as the set of files located in the specified path. For more information, see "[Usage](https://github.com/docker/build-push-action#usage)" in the README of the `docker/build-push-action` repository.
       # It uses the `tags` and `labels` parameters to tag and label the image with the output from the "meta" step.

.gitignore

@@ -5,7 +5,10 @@
 xcuserdata/
 DerivedData/
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
-.dewPoint-env
+.dewPoint-env*
 .topics
 mqtt_password.txt
 .env
+.smbdelete*
+buildServer.json
+.nvim/*

.swiftformat

@@ -0,0 +1,11 @@
+--self init-only
+--indent 2
+--ifdef indent
+--trimwhitespace always
+--wraparguments before-first
+--wrapparameters before-first
+--wrapcollections preserve
+--wrapconditions after-first
+--typeblanklines preserve
+--commas inline
+--stripunusedargs closure-only

.swiftlint.yml

@@ -0,0 +1,9 @@
+disabled_rules:
+  - closing_brace
+  - fuction_body_length
+
+included:
+  - Sources
+  - Tests
+
+ignore_multiline_statement_conditions: true

.swiftpm/dewpoint-controller-Package.xctestplan

@@ -0,0 +1,28 @@
+{
+  "configurations" : [
+    {
+      "id" : "AFB1047B-4742-43D2-AFB9-680C1CB2D273",
+      "name" : "Test Scheme Action",
+      "options" : {
+
+      }
+    }
+  ],
+  "defaultOptions" : {
+    "targetForVariableExpansion" : {
+      "containerPath" : "container:",
+      "identifier" : "dewpoint-controller",
+      "name" : "dewpoint-controller"
+    }
+  },
+  "testTargets" : [
+    {
+      "target" : {
+        "containerPath" : "container:",
+        "identifier" : "IntegrationTests",
+        "name" : "IntegrationTests"
+      }
+    }
+  ],
+  "version" : 1
+}

.swiftpm/xcode/xcshareddata/xcschemes/Bootstrap.xcscheme

@@ -1,67 +0,0 @@
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-            buildForArchiving = "YES"
-            buildForAnalyzing = "YES">
-            <BuildableReference
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-               BlueprintIdentifier = "Bootstrap"
-               BuildableName = "Bootstrap"
-               BlueprintName = "Bootstrap"
-               ReferencedContainer = "container:">
-            </BuildableReference>
-         </BuildActionEntry>
-      </BuildActionEntries>
-   </BuildAction>
-   <TestAction
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-      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
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-      useCustomWorkingDirectory = "NO"
-      ignoresPersistentStateOnLaunch = "NO"
-      debugDocumentVersioning = "YES"
-      debugServiceExtension = "internal"
-      allowLocationSimulation = "YES">
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-      shouldUseLaunchSchemeArgsEnv = "YES"
-      savedToolIdentifier = ""
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-      debugDocumentVersioning = "YES">
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-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "Bootstrap"
-            BuildableName = "Bootstrap"
-            BlueprintName = "Bootstrap"
-            ReferencedContainer = "container:">
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.swiftpm/xcode/xcshareddata/xcschemes/Client.xcscheme

@@ -1,67 +0,0 @@
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-               BuildableName = "Client"
-               BlueprintName = "Client"
-               ReferencedContainer = "container:">
-            </BuildableReference>
-         </BuildActionEntry>
-      </BuildActionEntries>
-   </BuildAction>
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-      shouldUseLaunchSchemeArgsEnv = "YES">
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-      </Testables>
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-   <LaunchAction
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-      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
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-      allowLocationSimulation = "YES">
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.swiftpm/xcode/xcshareddata/xcschemes/ClientLive.xcscheme

@@ -1,67 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<Scheme
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-         </BuildActionEntry>
-      </BuildActionEntries>
-   </BuildAction>
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.swiftpm/xcode/xcshareddata/xcschemes/DewPointEnvironment.xcscheme

@@ -1,67 +0,0 @@
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-            buildForArchiving = "YES"
-            buildForAnalyzing = "YES">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "DewPointEnvironment"
-               BuildableName = "DewPointEnvironment"
-               BlueprintName = "DewPointEnvironment"
-               ReferencedContainer = "container:">
-            </BuildableReference>
-         </BuildActionEntry>
-      </BuildActionEntries>
-   </BuildAction>
-   <TestAction
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-      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
-      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      shouldUseLaunchSchemeArgsEnv = "YES">
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-      </Testables>
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-      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      launchStyle = "0"
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.swiftpm/xcode/xcshareddata/xcschemes/EnvVars.xcscheme

@@ -1,67 +0,0 @@
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-               ReferencedContainer = "container:">
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.swiftpm/xcode/xcshareddata/xcschemes/Models.xcscheme

@@ -1,67 +0,0 @@
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.swiftpm/xcode/xcshareddata/xcschemes/dewPoint-controller-Package.xcscheme

@@ -1,222 +0,0 @@
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-            buildForProfiling = "YES"
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-            buildForAnalyzing = "YES">
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-         <BuildActionEntry
-            buildForTesting = "YES"
-            buildForRunning = "YES"
-            buildForProfiling = "YES"
-            buildForArchiving = "YES"
-            buildForAnalyzing = "YES">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "dewPoint-controller"
-               BuildableName = "dewPoint-controller"
-               BlueprintName = "dewPoint-controller"
-               ReferencedContainer = "container:">
-            </BuildableReference>
-         </BuildActionEntry>
-         <BuildActionEntry
-            buildForTesting = "YES"
-            buildForRunning = "YES"
-            buildForProfiling = "NO"
-            buildForArchiving = "NO"
-            buildForAnalyzing = "YES">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "ClientTests"
-               BuildableName = "ClientTests"
-               BlueprintName = "ClientTests"
-               ReferencedContainer = "container:">
-            </BuildableReference>
-         </BuildActionEntry>
-         <BuildActionEntry
-            buildForTesting = "YES"
-            buildForRunning = "YES"
-            buildForProfiling = "NO"
-            buildForArchiving = "NO"
-            buildForAnalyzing = "YES">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "dewPoint-controllerTests"
-               BuildableName = "dewPoint-controllerTests"
-               BlueprintName = "dewPoint-controllerTests"
-               ReferencedContainer = "container:">
-            </BuildableReference>
-         </BuildActionEntry>
-         <BuildActionEntry
-            buildForTesting = "YES"
-            buildForRunning = "YES"
-            buildForProfiling = "YES"
-            buildForArchiving = "YES"
-            buildForAnalyzing = "YES">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "TopicsLive"
-               BuildableName = "TopicsLive"
-               BlueprintName = "TopicsLive"
-               ReferencedContainer = "container:">
-            </BuildableReference>
-         </BuildActionEntry>
-      </BuildActionEntries>
-   </BuildAction>
-   <TestAction
-      buildConfiguration = "Debug"
-      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
-      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      shouldUseLaunchSchemeArgsEnv = "YES">
-      <Testables>
-         <TestableReference
-            skipped = "NO">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "ClientTests"
-               BuildableName = "ClientTests"
-               BlueprintName = "ClientTests"
-               ReferencedContainer = "container:">
-            </BuildableReference>
-         </TestableReference>
-         <TestableReference
-            skipped = "NO">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "dewPoint-controllerTests"
-               BuildableName = "dewPoint-controllerTests"
-               BlueprintName = "dewPoint-controllerTests"
-               ReferencedContainer = "container:">
-            </BuildableReference>
-         </TestableReference>
-      </Testables>
-   </TestAction>
-   <LaunchAction
-      buildConfiguration = "Debug"
-      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
-      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      launchStyle = "0"
-      useCustomWorkingDirectory = "NO"
-      ignoresPersistentStateOnLaunch = "NO"
-      debugDocumentVersioning = "YES"
-      debugServiceExtension = "internal"
-      allowLocationSimulation = "YES">
-      <MacroExpansion>
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "dewPoint-controller"
-            BuildableName = "dewPoint-controller"
-            BlueprintName = "dewPoint-controller"
-            ReferencedContainer = "container:">
-         </BuildableReference>
-      </MacroExpansion>
-   </LaunchAction>
-   <ProfileAction
-      buildConfiguration = "Release"
-      shouldUseLaunchSchemeArgsEnv = "YES"
-      savedToolIdentifier = ""
-      useCustomWorkingDirectory = "NO"
-      debugDocumentVersioning = "YES">
-      <MacroExpansion>
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "dewPoint-controller"
-            BuildableName = "dewPoint-controller"
-            BlueprintName = "dewPoint-controller"
-            ReferencedContainer = "container:">
-         </BuildableReference>
-      </MacroExpansion>
-   </ProfileAction>
-   <AnalyzeAction
-      buildConfiguration = "Debug">
-   </AnalyzeAction>
-   <ArchiveAction
-      buildConfiguration = "Release"
-      revealArchiveInOrganizer = "YES">
-   </ArchiveAction>
-</Scheme>

.swiftpm/xcode/xcshareddata/xcschemes/dewPoint-controller.xcscheme

@@ -1,126 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<Scheme
-   LastUpgradeVersion = "1330"
-   version = "1.3">
-   <BuildAction
-      parallelizeBuildables = "YES"
-      buildImplicitDependencies = "YES">
-      <BuildActionEntries>
-         <BuildActionEntry
-            buildForTesting = "YES"
-            buildForRunning = "YES"
-            buildForProfiling = "YES"
-            buildForArchiving = "YES"
-            buildForAnalyzing = "YES">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "dewPoint-controller"
-               BuildableName = "dewPoint-controller"
-               BlueprintName = "dewPoint-controller"
-               ReferencedContainer = "container:">
-            </BuildableReference>
-         </BuildActionEntry>
-         <BuildActionEntry
-            buildForTesting = "YES"
-            buildForRunning = "YES"
-            buildForProfiling = "NO"
-            buildForArchiving = "NO"
-            buildForAnalyzing = "YES">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "ClientTests"
-               BuildableName = "ClientTests"
-               BlueprintName = "ClientTests"
-               ReferencedContainer = "container:">
-            </BuildableReference>
-         </BuildActionEntry>
-         <BuildActionEntry
-            buildForTesting = "YES"
-            buildForRunning = "YES"
-            buildForProfiling = "NO"
-            buildForArchiving = "NO"
-            buildForAnalyzing = "YES">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "dewPoint-controllerTests"
-               BuildableName = "dewPoint-controllerTests"
-               BlueprintName = "dewPoint-controllerTests"
-               ReferencedContainer = "container:">
-            </BuildableReference>
-         </BuildActionEntry>
-      </BuildActionEntries>
-   </BuildAction>
-   <TestAction
-      buildConfiguration = "Debug"
-      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
-      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      shouldUseLaunchSchemeArgsEnv = "YES">
-      <Testables>
-         <TestableReference
-            skipped = "NO">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "ClientTests"
-               BuildableName = "ClientTests"
-               BlueprintName = "ClientTests"
-               ReferencedContainer = "container:">
-            </BuildableReference>
-         </TestableReference>
-         <TestableReference
-            skipped = "NO">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "dewPoint-controllerTests"
-               BuildableName = "dewPoint-controllerTests"
-               BlueprintName = "dewPoint-controllerTests"
-               ReferencedContainer = "container:">
-            </BuildableReference>
-         </TestableReference>
-      </Testables>
-   </TestAction>
-   <LaunchAction
-      buildConfiguration = "Debug"
-      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
-      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      launchStyle = "0"
-      useCustomWorkingDirectory = "NO"
-      ignoresPersistentStateOnLaunch = "NO"
-      debugDocumentVersioning = "YES"
-      debugServiceExtension = "internal"
-      allowLocationSimulation = "YES">
-      <BuildableProductRunnable
-         runnableDebuggingMode = "0">
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "dewPoint-controller"
-            BuildableName = "dewPoint-controller"
-            BlueprintName = "dewPoint-controller"
-            ReferencedContainer = "container:">
-         </BuildableReference>
-      </BuildableProductRunnable>
-   </LaunchAction>
-   <ProfileAction
-      buildConfiguration = "Release"
-      shouldUseLaunchSchemeArgsEnv = "YES"
-      savedToolIdentifier = ""
-      useCustomWorkingDirectory = "NO"
-      debugDocumentVersioning = "YES">
-      <BuildableProductRunnable
-         runnableDebuggingMode = "0">
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "dewPoint-controller"
-            BuildableName = "dewPoint-controller"
-            BlueprintName = "dewPoint-controller"
-            ReferencedContainer = "container:">
-         </BuildableReference>
-      </BuildableProductRunnable>
-   </ProfileAction>
-   <AnalyzeAction
-      buildConfiguration = "Debug">
-   </AnalyzeAction>
-   <ArchiveAction
-      buildConfiguration = "Release"
-      revealArchiveInOrganizer = "YES">
-   </ArchiveAction>
-</Scheme>

Dockerfile

@@ -1,13 +0,0 @@
-
-# Build the executable
-FROM swift:5.10 AS build
-WORKDIR /build
-COPY ./Package.* ./
-RUN swift package resolve
-COPY . .
-RUN swift build --enable-test-discovery -c release -Xswiftc -g
-
-# Run image
-FROM swift:5.10
-WORKDIR /run
-COPY --from=build /build/.build/release /run

Makefile

@@ -1,24 +1,39 @@
+DOCKER_IMAGE_NAME?="swift-mqtt-dewpoint"
+DOCKER_TAG_NAME?="latest"
 
-bootstrap-env:
+.PHONY: bootstrap
+bootstrap:
 	@cp Bootstrap/dewPoint-env-example .dewPoint-env
 
-bootstrap-topics:
+.PHONY: build
-	@cp Bootstrap/topics-example .topics
-
-bootstrap: bootstrap-env bootstrap-topics
-
 build:
-	@swift build
+	@swift build -Xswiftc -strict-concurrency=complete
 
+.PHONY: build-docker
+build-docker:
+	@docker build \
+		--file docker/Dockerfile \
+		--tag "${DOCKER_IMAGE_NAME}:${DOCKER_TAG_NAME}" .
+
+.PHONY: clean
+clean:
+	rm -rf .build
+
+.PHONY: run
 run:
-	@swift run dewPoint-controller
+	@swift run dewpoint-controller
-
-start-mosquitto:
-	@docker-compose start mosquitto
-
-stop-mosquitto:
-	@docker-compose rm -f mosquitto || true
 
+.PHONY: test-docker
 test-docker:
-	@docker-compose run -i test
+	@docker compose --file docker/docker-compose-test.yaml \
-	@docker-compose kill mosquitto-test
+		run --build --remove-orphans -i --rm test
+	@docker compose --file docker/docker-compose-test.yaml down
+
+.PHONY: start-mosquitto
+start-mosquitto:
+	@docker compose --file docker/docker-compose.yaml \
+		up -d mosquitto
+
+.PHONY: test-swift
+test-swift: start-mosquitto
+	@swift test --enable-code-coverage

Package.resolved

@@ -1,61 +1,195 @@
 {
-  "object": {
+  "originHash" : "486be5d69e4f0ba7b9f42046df31a727c7e394e4ecfae5671e1b194bed7c9e9b",
-    "pins": [
+  "pins" : [
-      {
+    {
-        "package": "mqtt-nio",
+      "identity" : "combine-schedulers",
-        "repositoryURL": "https://github.com/swift-server-community/mqtt-nio.git",
+      "kind" : "remoteSourceControl",
-        "state": {
+      "location" : "https://github.com/pointfreeco/combine-schedulers",
-          "branch": null,
+      "state" : {
-          "revision": "ca8af7a30c4690456ce7de276cd0f037489ba707",
+        "revision" : "9fa31f4403da54855f1e2aeaeff478f4f0e40b13",
-          "version": "2.5.3"
+        "version" : "1.0.2"
-        }
-      },
-      {
-        "package": "swift-log",
-        "repositoryURL": "https://github.com/apple/swift-log.git",
-        "state": {
-          "branch": null,
-          "revision": "5d66f7ba25daf4f94100e7022febf3c75e37a6c7",
-          "version": "1.4.2"
-        }
-      },
-      {
-        "package": "swift-nio",
-        "repositoryURL": "https://github.com/apple/swift-nio",
-        "state": {
-          "branch": null,
-          "revision": "6aa9347d9bc5bbfe6a84983aec955c17ffea96ef",
-          "version": "2.33.0"
-        }
-      },
-      {
-        "package": "swift-nio-ssl",
-        "repositoryURL": "https://github.com/apple/swift-nio-ssl.git",
-        "state": {
-          "branch": null,
-          "revision": "b5260a31c2a72a89fa684f5efb3054d8725a2316",
-          "version": "2.18.0"
-        }
-      },
-      {
-        "package": "swift-nio-transport-services",
-        "repositoryURL": "https://github.com/apple/swift-nio-transport-services.git",
-        "state": {
-          "branch": null,
-          "revision": "8ab824b140d0ebcd87e9149266ddc353e3705a3e",
-          "version": "1.11.4"
-        }
-      },
-      {
-        "package": "swift-psychrometrics",
-        "repositoryURL": "https://github.com/swift-psychrometrics/swift-psychrometrics",
-        "state": {
-          "branch": null,
-          "revision": "03573545c3750b406921eb22a9575c8062beef88",
-          "version": "0.1.2"
-        }
       }
-    ]
+    },
-  },
+    {
-  "version": 1
+      "identity" : "dotenv",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/swiftpackages/DotEnv.git",
+      "state" : {
+        "revision" : "1f15bb9de727d694af1d003a1a5d7a553752850f",
+        "version" : "3.0.0"
+      }
+    },
+    {
+      "identity" : "mqtt-nio",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/swift-server-community/mqtt-nio.git",
+      "state" : {
+        "revision" : "267b83ab5690d463ff00585a4fd6dc54b698e1d2",
+        "version" : "2.11.0"
+      }
+    },
+    {
+      "identity" : "swift-argument-parser",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-argument-parser.git",
+      "state" : {
+        "revision" : "41982a3656a71c768319979febd796c6fd111d5c",
+        "version" : "1.5.0"
+      }
+    },
+    {
+      "identity" : "swift-async-algorithms",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-async-algorithms.git",
+      "state" : {
+        "revision" : "5c8bd186f48c16af0775972700626f0b74588278",
+        "version" : "1.0.2"
+      }
+    },
+    {
+      "identity" : "swift-atomics",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-atomics.git",
+      "state" : {
+        "revision" : "cd142fd2f64be2100422d658e7411e39489da985",
+        "version" : "1.2.0"
+      }
+    },
+    {
+      "identity" : "swift-clocks",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/pointfreeco/swift-clocks",
+      "state" : {
+        "revision" : "b9b24b69e2adda099a1fa381cda1eeec272d5b53",
+        "version" : "1.0.5"
+      }
+    },
+    {
+      "identity" : "swift-collections",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-collections.git",
+      "state" : {
+        "revision" : "671108c96644956dddcd89dd59c203dcdb36cec7",
+        "version" : "1.1.4"
+      }
+    },
+    {
+      "identity" : "swift-concurrency-extras",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/pointfreeco/swift-concurrency-extras",
+      "state" : {
+        "revision" : "163409ef7dae9d960b87f34b51587b6609a76c1f",
+        "version" : "1.3.0"
+      }
+    },
+    {
+      "identity" : "swift-custom-dump",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/pointfreeco/swift-custom-dump",
+      "state" : {
+        "revision" : "82645ec760917961cfa08c9c0c7104a57a0fa4b1",
+        "version" : "1.3.3"
+      }
+    },
+    {
+      "identity" : "swift-dependencies",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/pointfreeco/swift-dependencies",
+      "state" : {
+        "revision" : "96eecd47660e8307877acb8c41cc5295ba7350a7",
+        "version" : "1.5.2"
+      }
+    },
+    {
+      "identity" : "swift-log",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-log.git",
+      "state" : {
+        "revision" : "9cb486020ebf03bfa5b5df985387a14a98744537",
+        "version" : "1.6.1"
+      }
+    },
+    {
+      "identity" : "swift-nio",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-nio",
+      "state" : {
+        "revision" : "914081701062b11e3bb9e21accc379822621995e",
+        "version" : "2.76.1"
+      }
+    },
+    {
+      "identity" : "swift-nio-ssl",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-nio-ssl.git",
+      "state" : {
+        "revision" : "b5260a31c2a72a89fa684f5efb3054d8725a2316",
+        "version" : "2.18.0"
+      }
+    },
+    {
+      "identity" : "swift-nio-transport-services",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-nio-transport-services.git",
+      "state" : {
+        "revision" : "8ab824b140d0ebcd87e9149266ddc353e3705a3e",
+        "version" : "1.11.4"
+      }
+    },
+    {
+      "identity" : "swift-psychrometrics",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/swift-psychrometrics/swift-psychrometrics",
+      "state" : {
+        "revision" : "6a457f3cefd9477f7aa76b2fb8ad557988c447bd",
+        "version" : "0.2.3"
+      }
+    },
+    {
+      "identity" : "swift-service-lifecycle",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/swift-server/swift-service-lifecycle.git",
+      "state" : {
+        "revision" : "f70b838872863396a25694d8b19fe58bcd0b7903",
+        "version" : "2.6.2"
+      }
+    },
+    {
+      "identity" : "swift-syntax",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/swiftlang/swift-syntax",
+      "state" : {
+        "revision" : "0687f71944021d616d34d922343dcef086855920",
+        "version" : "600.0.1"
+      }
+    },
+    {
+      "identity" : "swift-system",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-system.git",
+      "state" : {
+        "revision" : "c8a44d836fe7913603e246acab7c528c2e780168",
+        "version" : "1.4.0"
+      }
+    },
+    {
+      "identity" : "swift-tagged",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/pointfreeco/swift-tagged",
+      "state" : {
+        "revision" : "3907a9438f5b57d317001dc99f3f11b46882272b",
+        "version" : "0.10.0"
+      }
+    },
+    {
+      "identity" : "xctest-dynamic-overlay",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/pointfreeco/xctest-dynamic-overlay",
+      "state" : {
+        "revision" : "770f990d3e4eececb57ac04a6076e22f8c97daeb",
+        "version" : "1.4.2"
+      }
+    }
+  ],
+  "version" : 3
 }

Package.swift

@@ -2,99 +2,118 @@
 
 import PackageDescription
 
+let swiftSettings: [SwiftSetting] = [
+  .enableExperimentalFeature("StrictConcurrency"),
+  .enableUpcomingFeature("InferSendableCaptures")
+]
+
 let package = Package(
-  name: "dewPoint-controller",
+  name: "dewpoint-controller",
   platforms: [
-    .macOS(.v12)
+    .macOS(.v14)
   ],
   products: [
-    .executable(name: "dewPoint-controller", targets: ["dewPoint-controller"]),
+    .executable(name: "dewpoint-controller", targets: ["DewPointController"]),
-    .library(name: "Bootstrap", targets: ["Bootstrap"]),
+    .library(name: "CliClient", targets: ["CliClient"]),
-    .library(name: "DewPointEnvironment", targets: ["DewPointEnvironment"]),
-    .library(name: "EnvVars", targets: ["EnvVars"]),
     .library(name: "Models", targets: ["Models"]),
-    .library(name: "Client", targets: ["Client"]),
+    .library(name: "MQTTManager", targets: ["MQTTManager"]),
-    .library(name: "ClientLive", targets: ["ClientLive"]),
+    .library(name: "MQTTConnectionService", targets: ["MQTTConnectionService"]),
+    .library(name: "SensorsService", targets: ["SensorsService"])
   ],
   dependencies: [
+    .package(url: "https://github.com/apple/swift-argument-parser.git", from: "1.3.0"),
+    .package(url: "https://github.com/apple/swift-async-algorithms", from: "1.0.0"),
+    .package(url: "https://github.com/apple/swift-log", from: "1.6.0"),
+    .package(url: "https://github.com/swiftpackages/DotEnv.git", from: "3.0.0"),
+    .package(url: "https://github.com/pointfreeco/swift-dependencies", from: "1.5.2"),
+    .package(url: "https://github.com/pointfreeco/swift-custom-dump", from: "1.0.0"),
+    .package(url: "https://github.com/swift-psychrometrics/swift-psychrometrics", exact: "0.2.3"),
     .package(url: "https://github.com/swift-server-community/mqtt-nio.git", from: "2.0.0"),
-    .package(url: "https://github.com/apple/swift-nio", from: "2.0.0"),
+    .package(url: "https://github.com/swift-server/swift-service-lifecycle.git", from: "2.3.0")
-    .package(url: "https://github.com/swift-psychrometrics/swift-psychrometrics", from: "0.1.0")
   ],
   targets: [
-    .executableTarget(
-      name: "dewPoint-controller",
-      dependencies: [
-        "Bootstrap",
-        "ClientLive",
-        "TopicsLive",
-        .product(name: "MQTTNIO", package: "mqtt-nio"),
-        .product(name: "NIO", package: "swift-nio")
-      ]
-    ),
-    .testTarget(
-      name: "dewPoint-controllerTests",
-      dependencies: ["dewPoint-controller"]
-    ),
     .target(
-      name: "Bootstrap",
+      name: "CliClient",
-      dependencies: [
-        "DewPointEnvironment",
-        "EnvVars",
-        "ClientLive",
-        "Models",
-        .product(name: "MQTTNIO", package: "mqtt-nio"),
-        .product(name: "NIO", package: "swift-nio")
-      ]
-    ),
-    .target(
-      name: "DewPointEnvironment",
-      dependencies: [
-        "EnvVars",
-        "Client",
-        "Models",
-        .product(name: "MQTTNIO", package: "mqtt-nio"),
-      ]
-    ),
-    .target(
-      name: "EnvVars",
-      dependencies: []
-    ),
-    .target(
-      name: "Models",
-      dependencies: [
-        .product(name: "Psychrometrics", package: "swift-psychrometrics"),
-      ]
-    ),
-    .target(
-      name: "Client",
       dependencies: [
         "Models",
-        .product(name: "CoreUnitTypes", package: "swift-psychrometrics"),
+        .product(name: "Dependencies", package: "swift-dependencies"),
-        .product(name: "NIO", package: "swift-nio"),
+        .product(name: "DependenciesMacros", package: "swift-dependencies"),
-        .product(name: "Psychrometrics", package: "swift-psychrometrics")
+        .product(name: "DotEnv", package: "DotEnv"),
-      ]
-    ),
-    .target(
-      name: "ClientLive",
-      dependencies: [
-        "Client",
-        "EnvVars",
         .product(name: "MQTTNIO", package: "mqtt-nio")
       ]
     ),
     .testTarget(
-      name: "ClientTests",
+      name: "CliClientTests",
       dependencies: [
-        "Client",
+        "CliClient"
-        "ClientLive"
+      ],
+      resources: [
+        .copy("test.env"),
+        .copy("test-env.json")
+      ]
+    ),
+    .executableTarget(
+      name: "DewPointController",
+      dependencies: [
+        "CliClient",
+        "MQTTConnectionService",
+        "SensorsService",
+        .product(name: "ArgumentParser", package: "swift-argument-parser"),
+        .product(name: "CustomDump", package: "swift-custom-dump"),
+        // .product(name: "DotEnv", package: "DotEnv"),
+        .product(name: "PsychrometricClientLive", package: "swift-psychrometrics")
       ]
     ),
     .target(
-      name: "TopicsLive",
+      name: "Models",
       dependencies: [
-        "Models"
+        .product(name: "Logging", package: "swift-log"),
+        .product(name: "PsychrometricClient", package: "swift-psychrometrics")
+      ],
+      swiftSettings: swiftSettings
+    ),
+    .target(
+      name: "MQTTManager",
+      dependencies: [
+        .product(name: "AsyncAlgorithms", package: "swift-async-algorithms"),
+        .product(name: "Dependencies", package: "swift-dependencies"),
+        .product(name: "DependenciesMacros", package: "swift-dependencies"),
+        .product(name: "MQTTNIO", package: "mqtt-nio")
+      ],
+      swiftSettings: swiftSettings
+    ),
+    .target(
+      name: "MQTTConnectionService",
+      dependencies: [
+        "Models",
+        "MQTTManager",
+        .product(name: "ServiceLifecycle", package: "swift-service-lifecycle")
+      ],
+      swiftSettings: swiftSettings
+    ),
+    .testTarget(
+      name: "IntegrationTests",
+      dependencies: [
+        "DewPointController",
+        "MQTTConnectionService",
+        "MQTTManager",
+        "SensorsService",
+        .product(name: "PsychrometricClientLive", package: "swift-psychrometrics"),
+        .product(name: "ServiceLifecycleTestKit", package: "swift-service-lifecycle")
       ]
     ),
+    .target(
+      name: "SensorsService",
+      dependencies: [
+        "Models",
+        "MQTTManager",
+        .product(name: "Dependencies", package: "swift-dependencies"),
+        .product(name: "DependenciesMacros", package: "swift-dependencies"),
+        .product(name: "MQTTNIO", package: "mqtt-nio"),
+        .product(name: "PsychrometricClient", package: "swift-psychrometrics"),
+        .product(name: "ServiceLifecycle", package: "swift-service-lifecycle")
+      ],
+      swiftSettings: swiftSettings
+    )
   ]
 )

README.md

@@ -1,3 +1,7 @@
-# dewPoint-controller
+# dewpoint-controller
 
-A description of this package.
+![CI](https://git.housh.dev/michael/swift-mqtt-dewpoint/actions/workflows/ci.yaml/badge.svg?branch=main)
+
+Listens to an MQTT broker for temperature and humidity sensors and calculates
+the dew-point temperature and enthalpy for the sensor, then publishes those back
+to the MQTT broker.

Sources/Bootstrap/Bootstrap.swift

@@ -1,167 +0,0 @@
-import ClientLive
-import DewPointEnvironment
-import EnvVars
-import Logging
-import Foundation
-import Models
-import MQTTNIO
-import NIO
-
-/// Sets up the application environment and connections required.
-///
-/// - Parameters:
-///   - eventLoopGroup: The event loop group for the application.
-///   - logger: An optional logger for debugging.
-///   - autoConnect: A flag whether to auto-connect to the MQTT broker or not.
-public func bootstrap(
-  eventLoopGroup: EventLoopGroup,
-  logger: Logger? = nil,
-  autoConnect: Bool = true
-) -> EventLoopFuture<DewPointEnvironment> {
-  
-  logger?.debug("Bootstrapping Dew Point Controller...")
-  
-  return loadEnvVars(eventLoopGroup: eventLoopGroup, logger: logger)
-    .and(loadTopics(eventLoopGroup: eventLoopGroup, logger: logger))
-    .makeDewPointEnvironment(eventLoopGroup: eventLoopGroup, logger: logger)
-    .connectToMQTTBroker(autoConnect: autoConnect, logger: logger)
-}
-
-/// Loads the ``EnvVars`` either using the defualts, from a file in the root directory under `.dewPoint-env` or in the shell / application environment.
-///
-/// - Parameters:
-///   - eventLoopGroup: The event loop group for the application.
-///   - logger: An optional logger for debugging.
-private func loadEnvVars(
-  eventLoopGroup: EventLoopGroup,
-  logger: Logger?
-) -> EventLoopFuture<EnvVars> {
-  
-  logger?.debug("Loading env vars...")
-  
-  // TODO: Need to have the env file path passed in / dynamic.
-  let envFilePath = URL(fileURLWithPath: #file)
-    .deletingLastPathComponent()
-    .deletingLastPathComponent()
-    .deletingLastPathComponent()
-    .appendingPathComponent(".dewPoint-env")
-  
-  let decoder = JSONDecoder()
-  let encoder = JSONEncoder()
-  
-  let defaultEnvVars = EnvVars()
-  
-  let defaultEnvDict = (try? encoder.encode(defaultEnvVars))
-    .flatMap { try? decoder.decode([String: String].self, from: $0) }
-    ?? [:]
-  
-  // Read from file `.dewPoint-env` file if it exists.
-  let localEnvVarsDict = (try? Data(contentsOf: envFilePath))
-    .flatMap { try? decoder.decode([String: String].self, from: $0) }
-    ?? [:]
-    
-  // Merge with variables in the shell environment.
-  let envVarsDict = defaultEnvDict
-    .merging(localEnvVarsDict, uniquingKeysWith: { $1 })
-    .merging(ProcessInfo.processInfo.environment, uniquingKeysWith: { $1 })
-  
-  // Produces the final env vars from the merged items or uses defaults if something
-  // went wrong.
-  let envVars = (try? JSONSerialization.data(withJSONObject: envVarsDict))
-    .flatMap { try? decoder.decode(EnvVars.self, from: $0) }
-  ?? defaultEnvVars
-  
-  logger?.debug("Done loading env vars...")
-  return eventLoopGroup.next().makeSucceededFuture(envVars)
-}
-
-// MARK: TODO perhaps make loading from file an option passed in when app is launched.
-/// Load the topics from file in application root directory at `.topics`, if available or fall back to the defualt.
-///
-///  - Parameters:
-///   - eventLoopGroup: The event loop group for the application.
-///   - logger: An optional logger for debugging.
-private func loadTopics(eventLoopGroup: EventLoopGroup, logger: Logger?) -> EventLoopFuture<Topics> {
-  
-  logger?.debug("Loading topics from file...")
-  
-  let topicsFilePath = URL(fileURLWithPath: #file)
-    .deletingLastPathComponent()
-    .deletingLastPathComponent()
-    .deletingLastPathComponent()
-    .appendingPathComponent(".topics")
-  
-  let decoder = JSONDecoder()
-  
-  // Attempt to load the topics from file in root directory.
-  let localTopics = (try? Data.init(contentsOf: topicsFilePath))
-    .flatMap { try? decoder.decode(Topics.self, from: $0) }
-  
-  logger?.debug(
-    localTopics == nil
-      ? "Failed to load topics from file, falling back to defaults."
-      : "Done loading topics from file."
-  )
-  
-  // If we were able to load from file use that, else fallback to the defaults.
-  return eventLoopGroup.next().makeSucceededFuture(localTopics ?? .init())
-}
-
-extension EventLoopFuture where Value == (EnvVars, Topics) {
-  
-  /// Creates the ``DewPointEnvironment`` for the application after the ``EnvVars`` have been loaded.
-  ///
-  ///  - Parameters:
-  ///   - eventLoopGroup: The event loop group for the application.
-  ///   - logger: An optional logger for the application.
-  fileprivate func makeDewPointEnvironment(
-    eventLoopGroup: EventLoopGroup,
-    logger: Logger?
-  ) -> EventLoopFuture<DewPointEnvironment> {
-      map { envVars, topics in
-        let mqttClient = MQTTClient(envVars: envVars, eventLoopGroup: eventLoopGroup, logger: logger)
-        return DewPointEnvironment.init(
-          envVars: envVars,
-          mqttClient: mqttClient,
-          topics: topics
-        )
-      }
-  }
-}
-
-extension EventLoopFuture where Value == DewPointEnvironment {
-  
-  /// Connects to the MQTT broker after the ``DewPointEnvironment`` has been setup.
-  ///
-  /// - Parameters:
-  ///   - logger: An optional logger for debugging.
-  fileprivate func connectToMQTTBroker(autoConnect: Bool, logger: Logger?) -> EventLoopFuture<DewPointEnvironment> {
-    guard autoConnect else { return self }
-    return flatMap { environment in
-      logger?.debug("Connecting to MQTT Broker...")
-      return environment.mqttClient.connect()
-        .map { _ in
-          logger?.debug("Successfully connected to MQTT Broker...")
-          return environment
-        }
-    }
-  }
-}
-
-extension MQTTNIO.MQTTClient {
-  
-  fileprivate convenience init(envVars: EnvVars, eventLoopGroup: EventLoopGroup, logger: Logger?) {
-    self.init(
-      host: envVars.host,
-      port: envVars.port != nil ? Int(envVars.port!) : nil,
-      identifier: envVars.identifier,
-      eventLoopGroupProvider: .shared(eventLoopGroup),
-      logger: logger,
-      configuration: .init(
-        version: .v5_0,
-        userName: envVars.userName,
-        password: envVars.password
-      )
-    )
-  }
-}

Sources/CliClient/CliClient.swift

@@ -0,0 +1,224 @@
+import Dependencies
+import DependenciesMacros
+import DotEnv
+import Foundation
+import Logging
+import Models
+import MQTTNIO
+import NIO
+
+public extension DependencyValues {
+  var cliClient: CliClient {
+    get { self[CliClient.self] }
+    set { self[CliClient.self] = newValue }
+  }
+}
+
+/// Represents the interface needed for the command line application.
+///
+///
+@DependencyClient
+public struct CliClient {
+
+  /// Parse a log level from the given `EnvVars`.
+  public var logLevel: @Sendable (EnvVars) -> Logger.Level = { _ in .debug }
+
+  /// Generate the `EnvVars` with the given parameters.
+  public var makeEnvVars: @Sendable (EnvVarsRequest) async throws -> EnvVars
+
+  /// Generate the `MQTTClient` with the given parameters.
+  public var makeClient: @Sendable (ClientRequest) throws -> MQTTClient
+
+  /// Attempt to parse a string to an `MQTTClient.Version`.
+  public var parseMqttClientVersion: @Sendable (String) -> MQTTClient.Version?
+
+  /// Represents the parameters needed to create an `MQTTClient`.
+  ///
+  public struct ClientRequest: Sendable {
+
+    /// The environment variables used to create the client.
+    public let environment: EnvVars
+
+    /// The event loop group for the client.
+    public let eventLoopGroup: MultiThreadedEventLoopGroup
+
+    /// A logger to use with the client.
+    public let logger: Logger?
+
+    /// Create a new client request.
+    ///
+    /// - Parameters:
+    ///   - environment: The environment variables to use.
+    ///   - eventLoopGroup: The event loop group to use on the client.
+    ///   - logger: An optional logger to use on the client.
+    public init(
+      environment: EnvVars,
+      eventLoopGroup: MultiThreadedEventLoopGroup,
+      logger: Logger?
+    ) {
+      self.environment = environment
+      self.eventLoopGroup = eventLoopGroup
+      self.logger = logger
+    }
+
+  }
+
+  public struct EnvVarsRequest: Sendable {
+
+    public let envFilePath: String?
+    public let logger: Logger?
+    public let mqttClientVersion: String?
+
+    public init(
+      envFilePath: String? = nil,
+      logger: Logger? = nil,
+      version mqttClientVersion: String? = nil
+    ) {
+      self.envFilePath = envFilePath
+      self.logger = logger
+      self.mqttClientVersion = mqttClientVersion
+    }
+
+  }
+}
+
+extension CliClient: DependencyKey {
+  public static let testValue: CliClient = Self()
+  public static var liveValue: CliClient {
+    Self(
+      logLevel: { Logger.Level.from(environment: $0) },
+      makeEnvVars: {
+        try await EnvVars.load(
+          dotEnvFile: $0.envFilePath,
+          logger: $0.logger,
+          version: $0.mqttClientVersion
+        )
+      },
+      makeClient: {
+        MQTTClient(
+          environment: $0.environment,
+          eventLoopGroup: $0.eventLoopGroup,
+          logger: $0.logger
+        )
+      },
+      parseMqttClientVersion: { .init(string: $0) }
+    )
+  }
+}
+
+// MARK: - Helpers
+
+extension EnvironmentDependency {
+  func dotEnvDict(path: String?) async throws -> [String: String] {
+    guard let path,
+          let file = FileType(path: path)
+    else { return [:] }
+    return try await load(file)
+  }
+}
+
+extension EnvVars {
+
+  /// Load the `EnvVars` from the environment.
+  ///
+  /// - Paramaters:
+  ///   - dotEnvFile: An optional environment file to load.
+  ///   - logger: An optional logger to use for debugging.
+  ///   - version: A version that is specified from command line, ignoring any environment variable.
+  static func load(
+    dotEnvFile: String?,
+    logger: Logger?,
+    version: String?
+  ) async throws -> EnvVars {
+    @Dependency(\.environment) var environment
+
+    let defaultEnvVars = EnvVars()
+    let coders = environment.coders()
+
+    let defaultEnvDict = (try? coders.encode(defaultEnvVars))
+      .flatMap { try? coders.decode([String: String].self, from: $0) }
+      ?? [:]
+
+    let dotEnvDict = try await environment.dotEnvDict(path: dotEnvFile)
+    let envVarsDict = defaultEnvDict
+      .merging(environment.processInfo(), uniquingKeysWith: { $1 })
+      .merging(dotEnvDict, uniquingKeysWith: { $1 })
+
+    var envVars = (try? JSONSerialization.data(withJSONObject: envVarsDict))
+      .flatMap { try? coders.decode(EnvVars.self, from: $0) }
+      ?? defaultEnvVars
+
+    if let version {
+      envVars.version = version
+    }
+
+    logger?.debug("Done loading EnvVars...")
+
+    return envVars
+  }
+}
+
+@_spi(Internal)
+public extension MQTTClient {
+  convenience init(
+    environment envVars: EnvVars,
+    eventLoopGroup: EventLoopGroup,
+    logger: Logger?
+  ) {
+    self.init(
+      host: envVars.host,
+      port: envVars.port != nil ? Int(envVars.port!) : nil,
+      identifier: envVars.identifier,
+      eventLoopGroupProvider: .shared(eventLoopGroup),
+      logger: logger,
+      configuration: .init(
+        version: .parseOrDefault(string: envVars.version),
+        disablePing: false,
+        userName: envVars.userName,
+        password: envVars.password
+      )
+    )
+  }
+}
+
+@_spi(Internal)
+public extension MQTTClient.Version {
+  static let `default` = Self.v3_1_1
+
+  static func parseOrDefault(string: String?) -> Self {
+    guard let string, let value = Self(string: string) else {
+      return .default
+    }
+    return value
+  }
+
+  init?(string: String) {
+    if string.contains("5") {
+      self = .v5_0
+    } else if string.contains("3") {
+      self = .v3_1_1
+    } else {
+      return nil
+    }
+  }
+}
+
+extension Logger.Level {
+
+  /// Parse a `Logger.Level` from the loaded `EnvVars`.
+  static func from(environment envVars: EnvVars) -> Self {
+    // If the log level was set via an environment variable.
+    if let logLevel = envVars.logLevel {
+      return logLevel
+    }
+    // Parse the appEnv to derive an log level.
+    switch envVars.appEnv {
+    case .staging, .development:
+      return .debug
+    case .production:
+      return .info
+    case .testing:
+      return .trace
+    }
+  }
+}

Sources/CliClient/EnvironmentDependency.swift

@@ -0,0 +1,134 @@
+import Dependencies
+import DependenciesMacros
+import DotEnv
+import Foundation
+import Models
+
+@_spi(Internal)
+public extension DependencyValues {
+
+  /// A dependecy responsible for loding environment variables.
+  ///
+  /// This is just used internally of this module, but is useful to
+  /// override for testing purposes, so import using `@_spi(Internal)`.
+  var environment: EnvironmentDependency {
+    get { self[EnvironmentDependency.self] }
+    set { self[EnvironmentDependency.self] = newValue }
+  }
+}
+
+/// Responsible for loading environment variables and files.
+///
+///
+@_spi(Internal)
+@DependencyClient
+public struct EnvironmentDependency: Sendable {
+
+  public var coders: @Sendable () -> any Coderable = { JSONCoders() }
+
+  /// Load the variables based on the request.
+  public var load: @Sendable (FileType) async throws -> [String: String] = { _ in [:] }
+
+  /// Load the environment variables based on the current process environment.
+  ///
+  /// You can override this to use an empty environment, which is useful for testing purposes.
+  public var processInfo: @Sendable () -> [String: String] = { [:] }
+
+  /// Represents the types of files that can be loaded and decoded into
+  /// the environment.
+  public enum FileType: Equatable {
+    case dotEnv(path: String)
+    case json(path: String)
+
+    public init?(path: String) {
+      let strings = path.split(separator: ".")
+      guard let ext = strings.last else {
+        return nil
+      }
+      switch ext {
+      case "env":
+        self = .dotEnv(path: path)
+      case "json":
+        self = .json(path: path)
+      default:
+        return nil
+      }
+    }
+  }
+}
+
+struct DecodeError: Error {}
+
+@_spi(Internal)
+extension EnvironmentDependency: DependencyKey {
+
+  public static let testValue: EnvironmentDependency = Self()
+
+  public static func live(
+    decoder: JSONDecoder = .init(),
+    encoder: JSONEncoder = .init()
+  ) -> Self {
+    Self(
+      coders: { JSONCoders(decoder: decoder, encoder: encoder) },
+      load: { file in
+        switch file {
+        case let .dotEnv(path: path):
+          let file = try DotEnv.read(path: path)
+          return file.lines.reduce(into: [String: String]()) { partialResult, line in
+            partialResult[line.key] = line.value
+          }
+        case let .json(path: path):
+          let url = url(for: path)
+          return try decoder.decode(
+            [String: String].self,
+            from: Data(contentsOf: url)
+          )
+        }
+      },
+      processInfo: { ProcessInfo.processInfo.environment }
+    )
+  }
+
+  public static let liveValue: EnvironmentDependency = .live()
+}
+
+/// A type that encode and decode values.
+///
+/// This is really just here to override tests with coders that will throw an error,
+/// instead of encoding or decoding data.
+///
+@_spi(Internal)
+public protocol Coderable {
+  func encode<T: Encodable>(_ instance: T) throws -> Data
+  func decode<T: Decodable>(_ type: T.Type, from data: Data) throws -> T
+}
+
+struct JSONCoders: Coderable {
+
+  let decoder: JSONDecoder
+  let encoder: JSONEncoder
+
+  init(
+    decoder: JSONDecoder = .init(),
+    encoder: JSONEncoder = .init()
+  ) {
+    self.decoder = decoder
+    self.encoder = encoder
+  }
+
+  func encode<T>(_ instance: T) throws -> Data where T: Encodable {
+    try encoder.encode(instance)
+  }
+
+  func decode<T>(_ type: T.Type, from data: Data) throws -> T where T: Decodable {
+    try decoder.decode(T.self, from: data)
+  }
+}
+
+private func url(for path: String) -> URL {
+  #if os(Linux)
+    return URL(fileURLWithPath: path)
+  #else
+    return URL(filePath: path)
+  #endif
+}

Sources/Client/Interface.swift

@@ -1,44 +0,0 @@
-import CoreUnitTypes
-import Logging
-import Foundation
-import Models
-import NIO
-import Psychrometrics
-
-public struct Client {
-  
-  /// Add the publish listeners to the MQTT Broker, to be notified of published changes.
-  public var addListeners: () -> Void
-  
-  /// Connect to the MQTT Broker.
-  public var connect: () -> EventLoopFuture<Void>
-  
-  public var publishSensor: (SensorPublishRequest) -> EventLoopFuture<Void>
-  
-  /// Subscribe to appropriate topics / events.
-  public var subscribe: () -> EventLoopFuture<Void>
-  
-  /// Disconnect and close the connection to the MQTT Broker.
-  public var shutdown: () -> EventLoopFuture<Void>
-  
-  public init(
-    addListeners: @escaping () -> Void,
-    connect: @escaping () -> EventLoopFuture<Void>,
-    publishSensor: @escaping (SensorPublishRequest) -> EventLoopFuture<Void>,
-    shutdown: @escaping () -> EventLoopFuture<Void>,
-    subscribe: @escaping () -> EventLoopFuture<Void>
-  ) {
-    self.addListeners = addListeners
-    self.connect = connect
-    self.publishSensor = publishSensor
-    self.shutdown = shutdown
-    self.subscribe = subscribe
-  }
-  
-  public enum SensorPublishRequest {
-    case mixed(State.Sensors.TemperatureHumiditySensor<State.Sensors.Mixed>)
-    case postCoil(State.Sensors.TemperatureHumiditySensor<State.Sensors.PostCoil>)
-    case `return`(State.Sensors.TemperatureHumiditySensor<State.Sensors.Return>)
-    case supply(State.Sensors.TemperatureHumiditySensor<State.Sensors.Supply>)
-  }
-}

Sources/ClientLive/Helpers.swift

@@ -1,261 +0,0 @@
-import CoreUnitTypes
-import Logging
-import Models
-import MQTTNIO
-import NIO
-import NIOFoundationCompat
-import Psychrometrics
-
-/// Represents a type that can be initialized by a ``ByteBuffer``.
-protocol BufferInitalizable {
-  init?(buffer: inout ByteBuffer)
-}
-
-extension Double: BufferInitalizable {
-
-  /// Attempt to create / parse a double from a byte buffer.
-  init?(buffer: inout ByteBuffer) {
-    guard let string = buffer.readString(
-        length: buffer.readableBytes,
-        encoding: String.Encoding.utf8
-    )
-    else { return nil }
-    self.init(string)
-  }
-}
-
-extension Temperature: BufferInitalizable {
-  /// Attempt to create / parse a temperature from a byte buffer.
-  init?(buffer: inout ByteBuffer) {
-    guard let value = Double(buffer: &buffer) else { return nil }
-    self.init(value, units: .celsius)
-  }
-}
-
-extension RelativeHumidity: BufferInitalizable {
-  /// Attempt to create / parse a relative humidity from a byte buffer.
-  init?(buffer: inout ByteBuffer) {
-    guard let value = Double(buffer: &buffer) else { return nil }
-    self.init(value)
-  }
-}
-
-extension MQTTNIO.MQTTClient {
-  /// Logs a failure for a given topic and error.
-  func logFailure(topic: String, error: Error) {
-    logger.error("\(topic): \(error)")
-  }
-}
-
-extension Result where Success == MQTTPublishInfo {
-  func logIfFailure(client: MQTTNIO.MQTTClient, topic: String) -> ByteBuffer? {
-    switch self {
-    case let .success(value):
-      guard value.topicName == topic else { return nil }
-      return value.payload
-    case let .failure(error):
-      client.logFailure(topic: topic, error: error)
-      return nil
-    }
-  }
-}
-
-extension Optional where Wrapped == ByteBuffer {
-
-  func parse<T>(as type: T.Type) -> T? where T: BufferInitalizable {
-    switch self {
-    case var .some(buffer):
-      return T.init(buffer: &buffer)
-    case .none:
-      return nil
-    }
-  }
-}
-
-fileprivate struct TemperatureAndHumiditySensorKeyPathEnvelope {
-
-  let humidityTopic: KeyPath<Topics.Sensors, String>
-  let temperatureTopic: KeyPath<Topics.Sensors, String>
-  let temperatureState: WritableKeyPath<State.Sensors, Temperature?>
-  let humidityState: WritableKeyPath<State.Sensors, RelativeHumidity?>
-
-  func addListener(to client: MQTTNIO.MQTTClient, topics: Topics, state: State) {
-
-    let temperatureTopic = topics.sensors[keyPath: temperatureTopic]
-    client.logger.trace("Adding listener for topic: \(temperatureTopic)")
-    client.addPublishListener(named: temperatureTopic) { result in
-      result.logIfFailure(client: client, topic: temperatureTopic)
-        .parse(as: Temperature.self)
-        .map { temperature in
-          state.sensors[keyPath: temperatureState] = temperature
-        }
-    }
-
-    let humidityTopic = topics.sensors[keyPath: humidityTopic]
-    client.logger.trace("Adding listener for topic: \(humidityTopic)")
-    client.addPublishListener(named: humidityTopic) { result in
-      result.logIfFailure(client: client, topic: humidityTopic)
-        .parse(as: RelativeHumidity.self)
-        .map { humidity in
-          state.sensors[keyPath: humidityState] = humidity
-        }
-    }
-  }
-}
-
-extension Array where Element == TemperatureAndHumiditySensorKeyPathEnvelope {
-  func addListeners(to client: MQTTNIO.MQTTClient, topics: Topics, state: State) {
-    _ = self.map { envelope in
-      envelope.addListener(to: client, topics: topics, state: state)
-    }
-  }
-}
-
-extension Array where Element == MQTTSubscribeInfo {
-  static func sensors(topics: Topics) -> Self {
-    [
-      .init(topicFilter: topics.sensors.mixedAirSensor.temperature, qos: .atLeastOnce),
-      .init(topicFilter: topics.sensors.mixedAirSensor.humidity, qos: .atLeastOnce),
-      .init(topicFilter: topics.sensors.postCoilSensor.temperature, qos: .atLeastOnce),
-      .init(topicFilter: topics.sensors.postCoilSensor.humidity, qos: .atLeastOnce),
-      .init(topicFilter: topics.sensors.returnAirSensor.temperature, qos: .atLeastOnce),
-      .init(topicFilter: topics.sensors.returnAirSensor.humidity, qos: .atLeastOnce),
-      .init(topicFilter: topics.sensors.supplyAirSensor.temperature, qos: .atLeastOnce),
-      .init(topicFilter: topics.sensors.supplyAirSensor.humidity, qos: .atLeastOnce),
-    ]
-  }
-}
-
-extension State {
-  func addSensorListeners(to client: MQTTNIO.MQTTClient, topics: Topics) {
-    let envelopes: [TemperatureAndHumiditySensorKeyPathEnvelope] = [
-      .init(
-        humidityTopic: \.mixedAirSensor.humidity,
-        temperatureTopic: \.mixedAirSensor.temperature,
-        temperatureState: \.mixedAirSensor.temperature,
-        humidityState: \.mixedAirSensor.humidity
-      ),
-      .init(
-        humidityTopic: \.postCoilSensor.humidity,
-        temperatureTopic: \.postCoilSensor.temperature,
-        temperatureState: \.postCoilSensor.temperature,
-        humidityState: \.postCoilSensor.humidity
-      ),
-      .init(
-        humidityTopic: \.returnAirSensor.humidity,
-        temperatureTopic: \.returnAirSensor.temperature,
-        temperatureState: \.returnAirSensor.temperature,
-        humidityState: \.returnAirSensor.humidity
-      ),
-      .init(
-        humidityTopic: \.supplyAirSensor.humidity,
-        temperatureTopic: \.supplyAirSensor.temperature,
-        temperatureState: \.supplyAirSensor.temperature,
-        humidityState: \.supplyAirSensor.humidity
-      ),
-    ]
-    envelopes.addListeners(to: client, topics: topics, state: self)
-  }
-}
-
-extension Client.SensorPublishRequest {
-
-  func dewPointData(topics: Topics, units: PsychrometricEnvironment.Units?) -> (DewPoint, String)? {
-    switch self {
-    case let .mixed(sensor):
-      guard let dp = sensor.dewPoint(units: units) else { return nil }
-      return (dp, topics.sensors.mixedAirSensor.dewPoint)
-    case let .postCoil(sensor):
-      guard let dp = sensor.dewPoint(units: units) else { return nil }
-      return (dp, topics.sensors.postCoilSensor.dewPoint)
-    case let .return(sensor):
-      guard let dp = sensor.dewPoint(units: units) else { return nil }
-      return (dp, topics.sensors.returnAirSensor.dewPoint)
-    case let .supply(sensor):
-      guard let dp = sensor.dewPoint(units: units) else { return nil }
-      return (dp, topics.sensors.supplyAirSensor.dewPoint)
-    }
-  }
-
-  func enthalpyData(altitude: Length, topics: Topics, units: PsychrometricEnvironment.Units?) -> (EnthalpyOf<MoistAir>, String)? {
-    switch self {
-    case let .mixed(sensor):
-      guard let enthalpy = sensor.enthalpy(altitude: altitude, units: units) else { return nil }
-      return (enthalpy, topics.sensors.mixedAirSensor.enthalpy)
-    case let .postCoil(sensor):
-      guard let enthalpy = sensor.enthalpy(altitude: altitude, units: units) else { return nil }
-      return (enthalpy, topics.sensors.postCoilSensor.enthalpy)
-    case let .return(sensor):
-      guard let enthalpy = sensor.enthalpy(altitude: altitude, units: units) else { return nil }
-      return (enthalpy, topics.sensors.returnAirSensor.enthalpy)
-    case let .supply(sensor):
-      guard let enthalpy = sensor.enthalpy(altitude: altitude, units: units) else { return nil }
-      return (enthalpy, topics.sensors.supplyAirSensor.enthalpy)
-    }
-  }
-
-  func setHasProcessed(state: State) {
-    switch self {
-    case .mixed:
-      state.sensors.mixedAirSensor.needsProcessed = false
-    case .postCoil:
-      state.sensors.postCoilSensor.needsProcessed = false
-    case .return:
-      state.sensors.returnAirSensor.needsProcessed = false
-    case .supply:
-      state.sensors.supplyAirSensor.needsProcessed = false
-    }
-  }
-}
-
-extension MQTTNIO.MQTTClient {
-
-  func publishDewPoint(
-    request: Client.SensorPublishRequest,
-    state: State,
-    topics: Topics
-  ) -> EventLoopFuture<(MQTTNIO.MQTTClient, Client.SensorPublishRequest, State, Topics)> {
-    guard let (dewPoint, topic) = request.dewPointData(topics: topics, units: state.units)
-    else {
-      logger.trace("No dew point for sensor.")
-      return eventLoopGroup.next().makeSucceededFuture((self, request, state, topics))
-    }
-    let roundedDewPoint = round(dewPoint.rawValue * 100) / 100
-    logger.debug("Publishing dew-point: \(dewPoint), to: \(topic)")
-    return publish(
-      to: topic,
-      payload: ByteBufferAllocator().buffer(string: "\(roundedDewPoint)"),
-      qos: .atLeastOnce,
-      retain: true
-    )
-    .map { (self, request, state, topics) }
-  }
-}
-
-extension EventLoopFuture where Value == (Client.SensorPublishRequest, State) {
-  func setHasProcessed() -> EventLoopFuture<Void> {
-    map { request, state in
-      request.setHasProcessed(state: state)
-    }
-  }
-}
-
-extension EventLoopFuture where Value == (MQTTNIO.MQTTClient, Client.SensorPublishRequest, State, Topics) {
-  func publishEnthalpy() -> EventLoopFuture<(Client.SensorPublishRequest, State)> {
-    flatMap { client, request, state, topics in
-      guard let (enthalpy, topic) = request.enthalpyData(altitude: state.altitude, topics: topics, units: state.units)
-      else {
-        client.logger.trace("No enthalpy for sensor.")
-        return client.eventLoopGroup.next().makeSucceededFuture((request, state))
-      }
-      let roundedEnthalpy = round(enthalpy.rawValue * 100) / 100
-      client.logger.debug("Publishing enthalpy: \(enthalpy), to: \(topic)")
-      return client.publish(
-        to: topic,
-        payload: ByteBufferAllocator().buffer(string: "\(roundedEnthalpy)"),
-        qos: .atLeastOnce
-      )
-        .map { (request, state) }
-    }
-  }
-}

Sources/ClientLive/Live.swift

@@ -1,158 +0,0 @@
-import Foundation
-@_exported import Client
-import CoreUnitTypes
-import Models
-import MQTTNIO
-import NIO
-import Psychrometrics
-
-extension Client {
-
-  // The state passed in here needs to be a class or we get escaping errors in the `addListeners` method.
-  public static func live(
-    client: MQTTNIO.MQTTClient,
-    state: State,
-    topics: Topics
-  ) -> Self {
-    .init(
-      addListeners: {
-        state.addSensorListeners(to: client, topics: topics)
-      },
-      connect: {
-        client.connect()
-          .map { _ in }
-      },
-      publishSensor: { request in
-        client.publishDewPoint(request: request, state: state, topics: topics)
-          .publishEnthalpy()
-          .setHasProcessed()
-      },
-      shutdown: {
-        client.disconnect()
-          .map { try? client.syncShutdownGracefully() }
-      },
-      subscribe: {
-        // Sensor subscriptions
-        client.subscribe(to: .sensors(topics: topics))
-        .map { _ in }
-      }
-    )
-  }
-}
-
-import Logging
-import NIOTransportServices
-import EnvVars
-
-public class AsyncClient {
-  //public static let eventLoopGroup = NIOTSEventLoopGroup()
-  public static let eventLoopGroup = MultiThreadedEventLoopGroup(numberOfThreads: 1)
-  public let client: MQTTClient
-  public private(set) var shuttingDown: Bool
-
-  var logger: Logger { client.logger }
-
-  public init(envVars: EnvVars, logger: Logger) {
-    let config = MQTTClient.Configuration.init(
-      version: .v3_1_1,
-      userName: envVars.userName,
-      password: envVars.password,
-      useSSL: false,
-      useWebSockets: false,
-      tlsConfiguration: nil,
-      webSocketURLPath: nil
-    )
-    self.client = .init(
-      host: envVars.host,
-      identifier: envVars.identifier,
-      eventLoopGroupProvider: .shared(Self.eventLoopGroup),
-      logger: logger,
-      configuration: config
-    )
-    self.shuttingDown = false
-  }
-
-  public func connect() async {
-    do {
-      try await self.client.connect()
-      self.client.addCloseListener(named: "AsyncClient") { [self] result in
-        guard !self.shuttingDown else { return }
-        Task {
-          self.logger.debug("Connection closed.")
-          self.logger.debug("Reconnecting...")
-          await self.connect()
-        }
-      }
-      logger.debug("Connection successful.")
-    } catch {
-      logger.trace("Connection Failed.\n\(error)")
-    }
-  }
-
-  public func shutdown() async {
-    self.shuttingDown = true
-    try? await self.client.disconnect()
-    try? await self.client.shutdown()
-  }
-
-  func addSensorListeners() async {
-
-  }
-
-  // Need to save the recieved values somewhere.
-  func addPublishListener<T>(
-    topic: String,
-    decoding: T.Type
-  ) async throws where T: BufferInitalizable {
-    _ = try await self.client.subscribe(to: [.init(topicFilter: topic, qos: .atLeastOnce)])
-    Task {
-      let listener = self.client.createPublishListener()
-      for await result in listener {
-        switch result {
-        case let .success(packet):
-          var buffer = packet.payload
-          guard let value = T.init(buffer: &buffer) else {
-            logger.debug("Could not decode buffer: \(buffer)")
-            return
-          }
-          logger.debug("Recieved value: \(value)")
-        case let .failure(error):
-          logger.trace("Error:\n\(error)")
-        }
-      }
-    }
-  }
-
-
-  private func publish(string: String, to topic: String) async throws {
-    try await self.client.publish(
-      to: topic,
-      payload: ByteBufferAllocator().buffer(string: string),
-      qos: .atLeastOnce
-    )
-  }
-
-  private func publish(double: Double, to topic: String) async throws {
-    let rounded = round(double * 100) / 100
-    try await publish(string: "\(rounded)", to: topic)
-  }
-
-  func publishDewPoint(_ request: Client.SensorPublishRequest) async throws {
-    // fix
-    guard let (dewPoint, topic) = request.dewPointData(topics: .init(), units: nil) else { return }
-    try await self.publish(double: dewPoint.rawValue, to: topic)
-    logger.debug("Published dewpoint: \(dewPoint.rawValue), to: \(topic)")
-  }
-
-  func publishEnthalpy(_ request: Client.SensorPublishRequest) async throws {
-    // fix
-    guard let (enthalpy, topic) = request.enthalpyData(altitude: .seaLevel, topics: .init(), units: nil) else { return }
-    try await self.publish(double: enthalpy.rawValue, to: topic)
-    logger.debug("Publihsed enthalpy: \(enthalpy.rawValue), to: \(topic)")
-  }
-
-  public func publishSensor(_ request: Client.SensorPublishRequest) async throws {
-    try await publishDewPoint(request)
-    try await publishEnthalpy(request)
-  }
-}

Sources/DewPointController/Application.swift

@@ -0,0 +1,21 @@
+import ArgumentParser
+import Dependencies
+import Foundation
+import Logging
+import Models
+import MQTTConnectionService
+import MQTTManager
+import MQTTNIO
+import NIO
+import PsychrometricClientLive
+import SensorsService
+import ServiceLifecycle
+
+@main
+struct Application: AsyncParsableCommand {
+  static let configuration = CommandConfiguration(
+    commandName: "dewpoint-controller",
+    abstract: "Command for running the dewpoint mqtt service.",
+    subcommands: [Run.self, Debug.self]
+  )
+}

Sources/DewPointController/DebugCommand.swift

@@ -0,0 +1,74 @@
+import ArgumentParser
+import CliClient
+import CustomDump
+import Dependencies
+import DotEnv
+import Foundation
+import Logging
+import Models
+
+extension Application {
+
+  struct Debug: AsyncParsableCommand {
+
+    static let configuration: CommandConfiguration = .init(
+      commandName: "debug",
+      abstract: "Debug the environment variables and command line arguments."
+    )
+
+    @OptionGroup
+    var options: SharedOptions
+
+    @Flag(
+      name: [.customLong("show-password")],
+      help: "Don't redact the password from the console."
+    )
+    var showPassword: Bool = false
+
+    mutating func run() async throws {
+      @Dependency(\.cliClient) var client
+      let logger = Logger(label: "debug-command")
+
+      print("--------------------------")
+      print("Running debug command...")
+      if let envFile = options.envFile {
+        print("Reading env file: \(envFile)")
+        print("--------------------------")
+      } else {
+        print("No env file set.")
+        print("--------------------------")
+      }
+
+      print("Loading EnvVars")
+      print("--------------------------")
+      let envVars = try await client.makeEnvVars(options.envVarsRequest(logger: logger))
+      printEnvVars(envVars: envVars, showPassword: showPassword)
+      print("--------------------------")
+
+      if let logLevel = options.logLevel {
+        print("Log Level option: \(logLevel)")
+        print("--------------------------")
+      } else {
+        print("Log Level option: nil")
+        print("--------------------------")
+      }
+    }
+
+    private func printEnvVars(envVars: EnvVars, showPassword: Bool) {
+      // show the proper password to show depending on if it exists
+      // and if we should redact it or not.
+      var passwordString: String?
+      switch (showPassword, envVars.password) {
+      case (true, .none), (_, .none):
+        break
+      case (true, let .some(password)):
+        passwordString = password
+      case (false, .some):
+        passwordString = "<redacted>"
+      }
+      var envVars = envVars
+      envVars.password = passwordString
+      customDump(envVars)
+    }
+  }
+}

Sources/DewPointController/RunCommand.swift

@@ -0,0 +1,90 @@
+import ArgumentParser
+import CliClient
+import Dependencies
+import Foundation
+import Logging
+import Models
+import MQTTConnectionService
+import MQTTManager
+import MQTTNIO
+import NIO
+import PsychrometricClientLive
+import SensorsService
+import ServiceLifecycle
+
+extension Application {
+  /// Run the controller.
+  ///
+  struct Run: AsyncParsableCommand {
+
+    static let configuration = CommandConfiguration(
+      commandName: "run",
+      abstract: "Run the controller."
+    )
+
+    @OptionGroup
+    var options: SharedOptions
+
+    mutating func run() async throws {
+      @Dependency(\.cliClient) var cliClient
+
+      let (mqtt, logger) = try await cliClient.setupRun(options: options)
+      logger.info("Setting up environment...")
+
+      do {
+        try await withDependencies {
+          $0.psychrometricClient = .liveValue
+          $0.mqtt = .live(client: mqtt, logger: logger)
+        } operation: {
+          let mqttConnection = MQTTConnectionService(logger: logger)
+          let sensors = SensorsService(sensors: .live, logger: logger)
+
+          var serviceGroupConfiguration = ServiceGroupConfiguration(
+            services: [
+              mqttConnection,
+              sensors
+            ],
+            gracefulShutdownSignals: [.sigterm, .sigint],
+            logger: logger
+          )
+          // These settings prevent services from running forever after we've
+          // received a shutdown signal. In general it should not needed unless the
+          // services don't shutdown their async streams properly.
+          serviceGroupConfiguration.maximumCancellationDuration = .seconds(5)
+          serviceGroupConfiguration.maximumGracefulShutdownDuration = .seconds(10)
+
+          let serviceGroup = ServiceGroup(configuration: serviceGroupConfiguration)
+
+          logger.info("Starting dewpoint-controller!")
+          try await serviceGroup.run()
+        }
+
+        // Here we've received a shutdown signal and shutdown all the
+        // services.
+        try await mqtt.shutdown()
+      } catch {
+        // If something fails, shutdown the mqtt client.
+        try await mqtt.shutdown()
+      }
+    }
+  }
+}
+
+private extension CliClient {
+  func setupRun(
+    eventLoopGroup: MultiThreadedEventLoopGroup = .init(numberOfThreads: 1),
+    loggerLabel: String = "dewpoint-controller",
+    options: Application.SharedOptions
+  ) async throws -> (MQTTClient, Logger) {
+    var logger = Logger(label: loggerLabel)
+    let environment = try await makeEnvVars(options.envVarsRequest(logger: logger))
+    logger.logLevel = logLevel(environment)
+    let client = try makeClient(.init(
+      environment: environment,
+      eventLoopGroup: eventLoopGroup,
+      logger: logger
+    ))
+
+    return (client, logger)
+  }
+}

Sources/DewPointController/SharedOptions.swift

@@ -0,0 +1,52 @@
+import ArgumentParser
+import CliClient
+import Logging
+import Models
+import MQTTNIO
+
+extension Application {
+
+  struct SharedOptions: ParsableArguments {
+    @Option(
+      name: [.short, .customLong("env-file")],
+      help: "A file path to an env file."
+    )
+    var envFile: String?
+
+    @Option(
+      name: [.short, .customLong("log-level")],
+      help: "Set the logging level."
+    )
+    var logLevelContainer: LogLevelContainer?
+
+    @Option(
+      name: [.short, .long],
+      help: "Set the MQTT connecition version."
+    )
+    var version: String?
+
+    func envVarsRequest(logger: Logger?) -> CliClient.EnvVarsRequest {
+      .init(envFilePath: envFile, logger: logger, version: version)
+    }
+
+    var logLevel: Logger.Level? { logLevelContainer?.logLevel }
+
+  }
+}
+
+/// A container type for making `Logger.Level` into a type
+/// that can be parsed as a command line argument.  This is
+/// to suppress warnings vs. having `Logger.Level` adopt the
+/// protocol.
+@_spi(Internal)
+public struct LogLevelContainer: ExpressibleByArgument {
+  public let logLevel: Logger.Level?
+
+  public init?(argument: String) {
+    self.logLevel = .init(rawValue: argument.lowercased())
+  }
+
+  public func callAsFunction() -> Logger.Level? {
+    logLevel
+  }
+}

Sources/DewPointEnvironment/Environment.swift

@@ -1,21 +0,0 @@
-import Client
-import EnvVars
-import Models
-import MQTTNIO
-
-public struct DewPointEnvironment {
-  
-  public var envVars: EnvVars
-  public var mqttClient: MQTTNIO.MQTTClient
-  public var topics: Topics
-  
-  public init(
-    envVars: EnvVars,
-    mqttClient: MQTTNIO.MQTTClient,
-    topics: Topics = .init()
-  ) {
-    self.envVars = envVars
-    self.mqttClient = mqttClient
-    self.topics = topics
-  }
-}

Sources/MQTTConnectionService/MQTTConnectionService.swift

@@ -0,0 +1,38 @@
+import Dependencies
+import Logging
+import Models
+import MQTTManager
+import ServiceLifecycle
+
+public struct MQTTConnectionService: Service {
+
+  private let logger: Logger?
+
+  public init(
+    logger: Logger? = nil
+  ) {
+    var logger = logger
+    logger?[metadataKey: "type"] = "mqtt-connection-service"
+    self.logger = logger
+  }
+
+  /// The entry-point of the service which starts the connection
+  /// to the MQTT broker and handles graceful shutdown of the
+  /// connection.
+  public func run() async throws {
+    @Dependency(\.mqtt) var mqtt
+    try await mqtt.connect()
+
+    try await withGracefulShutdownHandler {
+      for await event in try mqtt.connectionStream().cancelOnGracefulShutdown() {
+        // We don't really need to do anything with the events, so just logging
+        // for now.  But we need to iterate on an async stream for the service to
+        // continue to run and handle graceful shutdowns.
+        logger?.trace("Received connection event: \(event)")
+      }
+    } onGracefulShutdown: {
+      self.logger?.trace("Received graceful shutdown.")
+      mqtt.shutdown()
+    }
+  }
+}

Sources/MQTTManager/Interface.swift

@@ -0,0 +1,221 @@
+import AsyncAlgorithms
+import Dependencies
+import DependenciesMacros
+import Foundation
+import Logging
+import MQTTNIO
+import NIO
+
+public extension DependencyValues {
+
+  /// A dependency that is responsible for managing the connection to
+  /// an MQTT broker, listen to topics, and publish values back to the
+  /// broker.
+  var mqtt: MQTTManager {
+    get { self[MQTTManager.self] }
+    set { self[MQTTManager.self] = newValue }
+  }
+}
+
+/// Represents the interface needed to connect, listen, and publish to an MQTT broker.
+///
+@DependencyClient
+public struct MQTTManager: Sendable {
+
+  public typealias ListenStream = AsyncStream<MQTTPublishInfo>
+
+  /// Connect to the MQTT broker.
+  public var connect: @Sendable () async throws -> Void
+
+  /// Create a stream of connection events.
+  ///
+  /// - SeeAlso: ``Event``
+  public var connectionStream: @Sendable () throws -> AsyncStream<Event>
+
+  private var _listen: @Sendable ([String], MQTTQoS) async throws -> ListenStream
+
+  /// Publish a value to the MQTT broker for a given topic.
+  public var publish: @Sendable (PublishRequest) async throws -> Void
+
+  /// Shutdown the connection to the MQTT broker.
+  public var shutdown: @Sendable () -> Void
+
+  private var _withClient: @Sendable ((MQTTClient) async throws -> Void) async throws -> Void
+
+  public init(
+    connect: @escaping @Sendable () async throws -> Void,
+    connectionStream: @escaping @Sendable () throws -> AsyncStream<MQTTManager.Event>,
+    listen: @escaping @Sendable ([String], MQTTQoS) async throws -> MQTTManager.ListenStream,
+    publish: @escaping @Sendable (MQTTManager.PublishRequest) async throws -> Void,
+    shutdown: @escaping @Sendable () -> Void,
+    withClient: @escaping @Sendable ((MQTTClient) async throws -> Void) async throws -> Void = { _ in unimplemented() }
+  ) {
+    self.connect = connect
+    self.connectionStream = connectionStream
+    self._listen = listen
+    self.publish = publish
+    self.shutdown = shutdown
+    self._withClient = withClient
+  }
+
+  /// Create an async stream that listens for changes to the given topics.
+  ///
+  /// - Parameters:
+  ///   - topics: The topics to listen for changes to.
+  ///   - qos: The MQTTQoS for the subscription.
+  public func listen(
+    to topics: [String],
+    qos: MQTTQoS = .atLeastOnce
+  ) async throws -> ListenStream {
+    try await _listen(topics, qos)
+  }
+
+  /// Create an async stream that listens for changes to the given topics.
+  ///
+  /// - Parameters:
+  ///   - topics: The topics to listen for changes to.
+  ///   - qos: The MQTTQoS for the subscription.
+  public func listen(
+    _ topics: String...,
+    qos: MQTTQoS = .atLeastOnce
+  ) async throws -> ListenStream {
+    try await listen(to: topics, qos: qos)
+  }
+
+  /// Publish a new value to the given topic.
+  ///
+  /// - Parameters:
+  ///   - payload: The value to publish.
+  ///   - topicName: The topic to publish the new value to.
+  ///   - qos: The MQTTQoS.
+  ///   - retain: The retain flag.
+  public func publish(
+    _ payload: ByteBuffer,
+    to topicName: String,
+    qos: MQTTQoS,
+    retain: Bool = false,
+    properties: MQTTProperties = .init()
+  ) async throws {
+    try await publish(.init(
+      topicName: topicName,
+      payload: payload,
+      qos: qos,
+      retain: retain,
+      properties: properties
+    ))
+  }
+
+  /// Perform an operation with the underlying MQTTClient, this can be useful in
+  /// tests, so this module needs imported with `@_spi(Internal) import MQTTManager` to use this method.
+  @_spi(Internal)
+  public func withClient(
+    _ callback: @Sendable (MQTTClient) async throws -> Void
+  ) async throws {
+    try await _withClient(callback)
+  }
+
+  /// Represents connection events that clients can listen for and
+  /// react accordingly.
+  public enum Event: Equatable, Sendable {
+    case connected
+    case disconnected
+    case shuttingDown
+  }
+
+  /// Represents the parameters required to publish a new value to the
+  /// MQTT broker.
+  public struct PublishRequest: Sendable {
+
+    /// The topic to publish the new value to.
+    public let topicName: String
+
+    /// The value to publish.
+    public let payload: ByteBuffer
+
+    /// The qos of the request.
+    public let qos: MQTTQoS
+
+    /// The retain flag for the request.
+    public let retain: Bool
+
+    public let properties: MQTTProperties
+
+    /// Create a new publish request.
+    ///
+    /// - Parameters:
+    ///   - topicName: The topic to publish to.
+    ///   - payload: The value to publish.
+    ///   - qos: The qos of the request.
+    ///   - retain: The retain flag of the request.
+    public init(
+      topicName: String,
+      payload: ByteBuffer,
+      qos: MQTTQoS,
+      retain: Bool,
+      properties: MQTTProperties
+    ) {
+      self.topicName = topicName
+      self.payload = payload
+      self.qos = qos
+      self.retain = retain
+      self.properties = properties
+    }
+  }
+
+}
+
+public extension MQTTManager {
+  /// Create the live manager.
+  ///
+  static func live(
+    client: MQTTClient,
+    cleanSession: Bool = false,
+    logger: Logger? = nil,
+    alwaysReconnect: Bool = true
+  ) -> Self {
+    let manager = ConnectionManager(
+      client: client,
+      logger: logger,
+      alwaysReconnect: alwaysReconnect
+    )
+    return .init(
+      connect: { try await manager.connect(cleanSession: cleanSession) },
+      connectionStream: {
+        MQTTConnectionStream(client: client, logger: logger)
+          .start()
+          .removeDuplicates()
+          .eraseToStream()
+      },
+      listen: { topics, qos in
+        try await manager.listen(to: topics, qos: qos)
+      },
+      publish: { request in
+        let topic = request.topicName
+        guard client.isActive() else {
+          logger?.debug("Client is not active, unable to publish to topic: \(topic)")
+          return
+        }
+        logger?.trace("Begin publishing to topic: \(topic)")
+        defer { logger?.debug("Done publishing to topic: \(topic)") }
+        try await client.publish(
+          to: request.topicName,
+          payload: request.payload,
+          qos: request.qos,
+          retain: request.retain,
+          properties: request.properties
+        ).get()
+      },
+      shutdown: {
+        Task { try await client.shutdown() }
+        manager.shutdown()
+      },
+      withClient: { callback in
+        try await callback(client)
+      }
+    )
+  }
+}
+
+extension MQTTManager: TestDependencyKey {
+  public static let testValue: MQTTManager = Self()
+}

Sources/MQTTManager/Internal/ConnectionManager.swift

@@ -0,0 +1,98 @@
+import Foundation
+import Logging
+import MQTTNIO
+
+actor ConnectionManager {
+  private let client: MQTTClient
+  private let logger: Logger?
+  private let name: String
+  private let shouldReconnect: Bool
+  private var hasConnected: Bool = false
+  private var listeners: [TopicListenerStream] = []
+  private var isShuttingDown = false
+
+  init(
+    client: MQTTClient,
+    logger: Logger?,
+    alwaysReconnect: Bool
+  ) {
+    var logger = logger
+    logger?[metadataKey: "instance"] = "\(Self.self)"
+    self.logger = logger
+
+    self.client = client
+    self.name = UUID().uuidString
+    self.shouldReconnect = alwaysReconnect
+  }
+
+  deinit {
+    if !isShuttingDown {
+      let message = """
+      Did not properly close the connection manager. This can lead to
+      dangling references.
+
+      Please call `shutdown` to properly close all connections and listener streams.
+      """
+      logger?.warning("\(message)")
+      self.shutdown()
+    }
+  }
+
+  private func setHasConnected() {
+    hasConnected = true
+  }
+
+  func listen(
+    to topics: [String],
+    qos: MQTTQoS
+  ) async throws -> MQTTManager.ListenStream {
+    let listener = TopicListenerStream(client: client, logger: logger, topics: topics, qos: qos)
+    listeners.append(listener)
+    await listener.start()
+    return listener.stream
+  }
+
+  func connect(
+    cleanSession: Bool
+  ) async throws {
+    guard !hasConnected else { return }
+    do {
+      try await client.connect(cleanSession: cleanSession)
+      setHasConnected()
+
+      client.addCloseListener(named: name) { [weak self] _ in
+        guard let `self` else { return }
+        self.logger?.debug("Connection closed.")
+        if self.shouldReconnect {
+          self.logger?.debug("Reconnecting...")
+          Task {
+            try await self.connect(cleanSession: cleanSession)
+          }
+        }
+      }
+
+      client.addShutdownListener(named: name) { _ in
+        self.shutdown()
+      }
+
+    } catch {
+      logger?.trace("Failed to connect: \(error)")
+      throw error
+    }
+  }
+
+  private func shutdownListeners() {
+    _ = listeners.map { $0.shutdown() }
+    listeners = []
+    isShuttingDown = true
+  }
+
+  nonisolated func shutdown(withLogging: Bool = true) {
+    if withLogging {
+      logger?.trace("Shutting down connection.")
+    }
+    client.removeCloseListener(named: name)
+    client.removeShutdownListener(named: name)
+    Task { await shutdownListeners() }
+  }
+}

Sources/MQTTManager/Internal/ConnectionStream.swift

@@ -0,0 +1,74 @@
+import Foundation
+import Logging
+import MQTTNIO
+
+@_spi(Internal)
+public actor MQTTConnectionStream: Sendable {
+
+  public typealias Element = MQTTManager.Event
+
+  private let client: MQTTClient
+  private let continuation: AsyncStream<Element>.Continuation
+  private let logger: Logger?
+  nonisolated let name: String
+  private let stream: AsyncStream<Element>
+  private var isShuttingDown = false
+
+  public init(client: MQTTClient, logger: Logger?) {
+    var logger = logger
+    logger?[metadataKey: "type"] = "\(Self.self)"
+    self.logger = logger
+
+    let (stream, continuation) = AsyncStream<Element>.makeStream()
+    self.client = client
+    self.continuation = continuation
+    self.name = UUID().uuidString
+    self.stream = stream
+  }
+
+  deinit { stop() }
+
+  public nonisolated func start() -> AsyncStream<Element> {
+    // Check if the client is active and yield the initial result.
+    continuation.yield(client.isActive() ? .connected : .disconnected)
+
+    // Continually check if the client is active.
+    let task = Task {
+      let isShuttingDown = await self.isShuttingDown
+      while !Task.isCancelled, !isShuttingDown {
+        try await Task.sleep(for: .milliseconds(100))
+        continuation.yield(client.isActive() ? .connected : .disconnected)
+      }
+    }
+
+    // Register listener on the client for when the connection
+    // closes.
+    client.addCloseListener(named: name) { _ in
+      self.logger?.trace("Client has disconnected.")
+      self.continuation.yield(.disconnected)
+    }
+
+    // Register listener on the client for when the client
+    // is shutdown.
+    client.addShutdownListener(named: name) { _ in
+      self.logger?.trace("Client is shutting down, ending connection stream: \(self.name)")
+      self.continuation.yield(.shuttingDown)
+      Task { await self.setIsShuttingDown() }
+      task.cancel()
+      self.stop()
+    }
+
+    return stream
+  }
+
+  private func setIsShuttingDown() {
+    isShuttingDown = true
+  }
+
+  public nonisolated func stop() {
+    client.removeCloseListener(named: name)
+    client.removeShutdownListener(named: name)
+    continuation.finish()
+  }
+
+}

Sources/MQTTManager/Internal/TopicListenerStream.swift

@@ -0,0 +1,141 @@
+import Foundation
+import Logging
+import MQTTNIO
+
+actor TopicListenerStream {
+
+  typealias Stream = MQTTManager.ListenStream
+
+  private let client: MQTTClient
+  private let configuration: Configuration
+  private let continuation: Stream.Continuation
+  private let logger: Logger?
+  private let name: String
+  let stream: Stream
+  private var shuttingDown: Bool = false
+  private var onShutdownHandler: (@Sendable () -> Void)?
+
+  init(
+    client: MQTTClient,
+    logger: Logger?,
+    topics: [String],
+    qos: MQTTQoS
+  ) {
+    // Setup the logger so we can more easily decipher log messages.
+    var logger = logger
+    logger?[metadataKey: "type"] = "\(Self.self)"
+    self.logger = logger
+
+    let (stream, continuation) = Stream.makeStream()
+    self.client = client
+    self.configuration = .init(qos: qos, topics: topics)
+    self.continuation = continuation
+    self.name = UUID().uuidString
+    self.stream = stream
+  }
+
+  struct Configuration: Sendable {
+    let qos: MQTTQoS
+    let topics: [String]
+  }
+
+  deinit {
+    if !shuttingDown {
+      let message = """
+      Shutdown was not called on topic listener. This could lead to potential errors or
+      the stream never ending.
+
+      Please ensure that you call shutdown on the listener.
+      """
+      client.logger.warning("\(message)")
+      continuation.finish()
+    }
+    client.removePublishListener(named: name)
+    client.removeShutdownListener(named: name)
+  }
+
+  private func subscribe() async throws {
+    guard !shuttingDown else { return }
+    logger?.debug("Begin subscribing to topics.")
+    do {
+      _ = try await client.subscribe(to: configuration.topics.map {
+        MQTTSubscribeInfo(topicFilter: $0, qos: configuration.qos)
+      })
+    } catch {
+      logger?.error("Received error while subscribing to topics: \(configuration.topics)")
+      throw TopicListenerError.failedToSubscribe
+    }
+    logger?.debug("Done subscribing to topics.")
+  }
+
+  public func start() {
+    logger?.trace("Starting listener for topics: \(configuration.topics)")
+
+    let stream = MQTTConnectionStream(client: client, logger: logger)
+      .start()
+      .removeDuplicates()
+      .eraseToStream()
+
+    let task = Task {
+      // Listen for connection events to restablish the stream upon a
+      // client becoming disconnected / reconnected, and properly shutdown
+      // the stream on the client being shutdown.
+      for await event in stream {
+        logger?.trace("Received event: \(event)")
+        switch event {
+        case .shuttingDown:
+          shutdown()
+        case .disconnected:
+          try await Task.sleep(for: .milliseconds(100))
+        case .connected:
+          try await subscribe()
+          client.addPublishListener(named: name) { result in
+            switch result {
+            case let .failure(error):
+              self.logger?.error("Received error while listening: \(error)")
+            case let .success(publishInfo):
+              if self.configuration.topics.contains(publishInfo.topicName) {
+                self.logger?.debug("Recieved new value for topic: \(publishInfo.topicName)")
+                self.continuation.yield(publishInfo)
+              }
+            }
+          }
+        }
+      }
+    }
+
+    onShutdownHandler = { task.cancel() }
+  }
+
+  private func setIsShuttingDown() {
+    shuttingDown = true
+    onShutdownHandler = nil
+  }
+
+  public nonisolated func shutdown() {
+    client.logger.trace("Closing topic listener...")
+    continuation.finish()
+    client.removePublishListener(named: name)
+    client.removeShutdownListener(named: name)
+    Task {
+      await onShutdownHandler?()
+      await self.setIsShuttingDown()
+    }
+  }
+
+}
+
+// MARK: - Errors
+
+public enum TopicListenerError: Error {
+  case connectionTimeout
+  case failedToSubscribe
+}
+
+public struct MQTTListenResultError: Error {
+  let underlyingError: any Error
+
+  init(_ underlyingError: any Error) {
+    self.underlyingError = underlyingError
+  }
+}

Sources/Models/EnvVars.swift

@@ -1,29 +1,36 @@
 import Foundation
+import Logging
 
 /// Holds common settings for connecting to your MQTT broker.  The default values can be used,
 /// they can be loaded from the shell environment, or from a file located in the root directory.
 ///
 /// This allows us to keep sensitve settings out of the repository.
-public struct EnvVars: Codable, Equatable {
+public struct EnvVars: Codable, Equatable, Sendable {
-  
+
   /// The current app environment.
   public var appEnv: AppEnv
-  
+
   /// The MQTT host.
   public var host: String
-  
+
   /// The MQTT port.
   public var port: String?
-  
+
   /// The identifier to use when connecting to the MQTT broker.
   public var identifier: String
-  
+
   /// The MQTT user name.
   public var userName: String?
-  
+
   /// The MQTT user password.
   public var password: String?
-  
+
+  /// Set a custom logging level.
+  public var logLevel: Logger.Level?
+
+  /// Set the mqtt broker version.
+  public var version: String?
+
   /// Create a new ``EnvVars``
   ///
   /// - Parameters:
@@ -37,18 +44,22 @@ public struct EnvVars: Codable, Equatable {
     appEnv: AppEnv = .development,
     host: String = "127.0.0.1",
     port: String? = "1883",
-    identifier: String = "dewPoint-controller",
+    identifier: String = "dewpoint-controller",
     userName: String? = "mqtt_user",
-    password: String? = "secret!"
+    password: String? = "secret!",
-  ){
+    logLevel: Logger.Level? = nil,
+    version: String? = nil
+  ) {
     self.appEnv = appEnv
     self.host = host
     self.port = port
     self.identifier = identifier
     self.userName = userName
     self.password = password
+    self.logLevel = logLevel
+    self.version = version
   }
-  
+
   /// Custom coding keys.
   private enum CodingKeys: String, CodingKey {
     case appEnv = "APP_ENV"
@@ -57,10 +68,12 @@ public struct EnvVars: Codable, Equatable {
     case identifier = "MQTT_IDENTIFIER"
     case userName = "MQTT_USERNAME"
     case password = "MQTT_PASSWORD"
+    case logLevel = "LOG_LEVEL"
+    case version = "MQTT_VERSION"
   }
-  
+
   /// Represents the different app environments.
-  public enum AppEnv: String, Codable {
+  public enum AppEnv: String, Codable, Sendable {
     case development
     case production
     case staging

Sources/Models/Mode.swift

@@ -1,37 +0,0 @@
-import CoreUnitTypes
-
-/// Represents the different modes that the controller can be in.
-public enum Mode: Equatable {
-  
-  /// Allows controller to run in humidify or dehumidify mode.
-  case auto
-  
-  /// Only handle humidify mode.
-  case humidifyOnly(HumidifyMode)
-  
-  /// Only handle dehumidify mode.
-  case dehumidifyOnly(DehumidifyMode)
-  
-  /// Don't control humidify or dehumidify modes.
-  case off
-  
-  /// Represents the control modes for the humidify control state.
-  public enum HumidifyMode: Equatable {
-    
-    /// Control humidifying based off dew-point.
-    case dewPoint(Temperature)
-    
-    /// Control humidifying based off relative humidity.
-    case relativeHumidity(RelativeHumidity)
-  }
-  
-  /// Represents the control modes for the dehumidify control state.
-  public enum DehumidifyMode: Equatable {
-    
-    /// Control dehumidifying based off dew-point.
-    case dewPoint(high: Temperature, low: Temperature)
-    
-    /// Control humidifying based off relative humidity.
-    case relativeHumidity(high: RelativeHumidity, low: RelativeHumidity)
-  }
-}

Sources/Models/State.swift

@@ -1,104 +0,0 @@
-import Foundation
-import Psychrometrics
-
-// TODO: Make this a struct, then create a Store class that holds the state??
-public final class State {
-  
-  public var altitude: Length
-  public var sensors: Sensors
-  public var units: PsychrometricEnvironment.Units {
-    didSet {
-      PsychrometricEnvironment.shared.units = units
-    }
-  }
-  
-  public init(
-    altitude: Length = .seaLevel,
-    sensors: Sensors = .init(),
-    units: PsychrometricEnvironment.Units = .imperial
-  ) {
-    self.altitude = altitude
-    self.sensors = sensors
-    self.units = units
-  }
-  
-  public struct Sensors: Equatable {
-    
-    public var mixedAirSensor: TemperatureHumiditySensor<Mixed>
-    public var postCoilSensor: TemperatureHumiditySensor<PostCoil>
-    public var returnAirSensor: TemperatureHumiditySensor<Return>
-    public var supplyAirSensor: TemperatureHumiditySensor<Supply>
-    
-    public init(
-      mixedAirSensor: TemperatureHumiditySensor<Mixed> = .init(),
-      postCoilSensor: TemperatureHumiditySensor<PostCoil> = .init(),
-      returnAirSensor: TemperatureHumiditySensor<Return> = .init(),
-      supplyAirSensor: TemperatureHumiditySensor<Supply> = .init()
-    ) {
-      self.mixedAirSensor = mixedAirSensor
-      self.postCoilSensor = postCoilSensor
-      self.returnAirSensor = returnAirSensor
-      self.supplyAirSensor = supplyAirSensor
-    }
-    
-    public var needsProcessed: Bool {
-      mixedAirSensor.needsProcessed
-        || postCoilSensor.needsProcessed
-        || returnAirSensor.needsProcessed
-        || supplyAirSensor.needsProcessed
-    }
-  }
-}
-
-extension State.Sensors {
-  
-  public struct TemperatureHumiditySensor<Location>: Equatable {
-    
-    @TrackedChanges
-    public var temperature: Temperature?
-    
-    @TrackedChanges
-    public var humidity: RelativeHumidity?
-    
-    public var needsProcessed: Bool {
-      get { $temperature.needsProcessed || $humidity.needsProcessed }
-      set {
-        $temperature.needsProcessed = newValue
-        $humidity.needsProcessed = newValue
-      }
-    }
-    
-    public func dewPoint(units: PsychrometricEnvironment.Units? = nil) -> DewPoint? {
-      guard let temperature = temperature,
-            let humidity = humidity,
-            !temperature.rawValue.isNaN,
-            !humidity.rawValue.isNaN
-      else { return nil }
-      return .init(dryBulb: temperature, humidity: humidity, units: units)
-    }
-    
-    public func enthalpy(altitude: Length, units: PsychrometricEnvironment.Units? = nil) -> EnthalpyOf<MoistAir>? {
-      guard let temperature = temperature,
-            let humidity = humidity,
-            !temperature.rawValue.isNaN,
-            !humidity.rawValue.isNaN
-      else { return nil }
-      return .init(dryBulb: temperature, humidity: humidity, altitude: altitude, units: units)
-    }
-    
-    public init(
-      temperature: Temperature? = nil,
-      humidity: RelativeHumidity? = nil,
-      needsProcessed: Bool = false
-    ) {
-      self._temperature = .init(wrappedValue: temperature, needsProcessed: needsProcessed)
-      self._humidity = .init(wrappedValue: humidity, needsProcessed: needsProcessed)
-    }
-  }
-  
-  // MARK: - Temperature / Humidity Sensor Location Namespaces
-  public enum Mixed { }
-  public enum PostCoil { }
-  public enum Return { }
-  public enum Supply { }
-}

Sources/Models/TemperatureAndHumiditySensor.swift

@@ -0,0 +1,152 @@
+import Dependencies
+import PsychrometricClient
+
+/// Represents a temperature and humidity sensor that can be used to derive
+/// the dew-point temperature and enthalpy values.
+///
+/// > Note: Temperature values are received in `celsius`.
+public struct TemperatureAndHumiditySensor: Identifiable, Sendable {
+
+  @Dependency(\.psychrometricClient) private var psychrometrics
+
+  /// The identifier of the sensor, same as the location.
+  public var id: Location { location }
+
+  /// The altitude of the sensor.
+  public let altitude: Length
+
+  /// The current humidity value of the sensor.
+  @TrackedChanges
+  public var humidity: RelativeHumidity?
+
+  /// The location identifier of the sensor
+  public let location: Location
+
+  /// The current temperature value of the sensor.
+  @TrackedChanges
+  public var temperature: DryBulb?
+
+  /// The topics to listen for updated sensor values.
+  public let topics: Topics
+
+  /// Create a new temperature and humidity sensor.
+  ///
+  /// - Parameters:
+  ///   - location: The location of the sensor.
+  ///   - altitude: The altitude of the sensor.
+  ///   - temperature: The current temperature value of the sensor.
+  ///   - humidity: The current relative humidity value of the sensor.
+  ///   - needsProcessed: If the sensor needs to be processed.
+  public init(
+    location: Location,
+    altitude: Length = .feet(800.0),
+    temperature: DryBulb? = nil,
+    humidity: RelativeHumidity? = nil,
+    needsProcessed: Bool = false,
+    topics: Topics? = nil
+  ) {
+    self.altitude = altitude
+    self.location = location
+    self._temperature = TrackedChanges(wrappedValue: temperature, needsProcessed: needsProcessed)
+    self._humidity = TrackedChanges(wrappedValue: humidity, needsProcessed: needsProcessed)
+    self.topics = topics ?? .init(location: location)
+  }
+
+  /// The calculated dew-point temperature of the sensor.
+  public var dewPoint: DewPoint? {
+    get async {
+      guard let temperature = temperature,
+            let humidity = humidity,
+            !temperature.value.isNaN,
+            !humidity.value.isNaN
+      else { return nil }
+      return try? await psychrometrics.dewPoint(.dryBulb(
+        .fahrenheit(temperature.fahrenheit),
+        relativeHumidity: humidity
+      ))
+    }
+  }
+
+  /// The calculated enthalpy of the sensor.
+  public var enthalpy: EnthalpyOf<MoistAir>? {
+    get async {
+      guard let temperature = temperature,
+            let humidity = humidity,
+            !temperature.value.isNaN,
+            !humidity.value.isNaN
+      else { return nil }
+      return try? await psychrometrics.enthalpy.moistAir(
+        .dryBulb(.fahrenheit(temperature.fahrenheit), relativeHumidity: humidity, altitude: altitude, units: .imperial)
+      )
+    }
+  }
+
+  /// Check whether any of the sensor values have changed and need processed.
+  ///
+  /// - Note: Setting a value will set to both the temperature and humidity properties.
+  public var needsProcessed: Bool {
+    get { $temperature.needsProcessed || $humidity.needsProcessed }
+    set {
+      $temperature.needsProcessed = newValue
+      $humidity.needsProcessed = newValue
+    }
+  }
+
+  /// Represents the different locations of a temperature and humidity sensor, which can
+  /// be used to derive the topic to both listen and publish new values to.
+  public enum Location: String, CaseIterable, Equatable, Hashable, Sendable {
+    case mixedAir = "mixed_air"
+    case postCoil = "post_coil"
+    case `return`
+    case supply
+  }
+
+  /// Represents the MQTT topics to listen for updated sensor values on.
+  public struct Topics: Equatable, Hashable, Sendable {
+
+    /// The dew-point temperature topic for the sensor.
+    public let dewPoint: String
+
+    /// The enthalpy topic for the sensor.
+    public let enthalpy: String
+
+    /// The humidity topic of the sensor.
+    public let humidity: String
+
+    /// The temperature topic of the sensor.
+    public let temperature: String
+
+    public init(
+      dewPoint: String,
+      enthalpy: String,
+      humidity: String,
+      temperature: String
+    ) {
+      self.dewPoint = dewPoint
+      self.enthalpy = enthalpy
+      self.humidity = humidity
+      self.temperature = temperature
+    }
+
+    public init(topicPrefix: String? = "frankensystem", location: TemperatureAndHumiditySensor.Location) {
+      var prefix = topicPrefix ?? ""
+      if prefix.reversed().starts(with: "/") {
+        prefix = "\(prefix.dropLast())"
+      }
+      self.init(
+        dewPoint: "\(prefix)/sensor/\(location.rawValue)_dew_point/state",
+        enthalpy: "\(prefix)/sensor/\(location.rawValue)_enthalpy/state",
+        humidity: "\(prefix)/sensor/\(location.rawValue)_humidity/state",
+        temperature: "\(prefix)/sensor/\(location.rawValue)_temperature/state"
+      )
+    }
+  }
+}
+
+public extension Array where Element == TemperatureAndHumiditySensor {
+  static var live: Self {
+    TemperatureAndHumiditySensor.Location.allCases.map {
+      TemperatureAndHumiditySensor(location: $0)
+    }
+  }
+}

Sources/Models/Topics.swift

@@ -1,269 +0,0 @@
-
-/// A container for all the different topics that are needed by the application.
-public struct Topics: Codable, Equatable {
-  
-  /// The command topics the application can publish to.
-  public var commands: Commands
-  
-  /// The sensor topics the application can read from / write to.
-  public var sensors: Sensors
-  
-  /// The set point topics the application can read set point values from.
-  public var setPoints: SetPoints
-  
-  /// The state topics the application can read state values from.
-  public var states: States
-  
-  /// Create the topics required by the application.
-  ///
-  /// - Parameters:
-  ///   - sensors: The sensor topics.
-  ///   - setPoints: The set point topics
-  ///   - states: The states topics
-  ///   - relays: The relay topics
-  public init(
-    commands: Commands = .init(),
-    sensors: Sensors = .init(),
-    setPoints: SetPoints = .init(),
-    states: States = .init()
-  ) {
-    self.commands = commands
-    self.sensors = sensors
-    self.setPoints = setPoints
-    self.states = states
-  }
-  
-  /// Represents the sensor topics.
-  public struct Sensors: Codable, Equatable {
-    
-    public var mixedAirSensor: TemperatureAndHumiditySensor<State.Sensors.Mixed>
-    public var postCoilSensor: TemperatureAndHumiditySensor<State.Sensors.PostCoil>
-    public var returnAirSensor: TemperatureAndHumiditySensor<State.Sensors.Return>
-    public var supplyAirSensor: TemperatureAndHumiditySensor<State.Sensors.Supply>
-    
-    public init(
-      mixedAirSensor: TemperatureAndHumiditySensor<State.Sensors.Mixed> = .default(location: "mixed=air"),
-      postCoilSensor: TemperatureAndHumiditySensor<State.Sensors.PostCoil> = .default(location: "post-coil"),
-      returnAirSensor: TemperatureAndHumiditySensor<State.Sensors.Return> = .default(location: "return"),
-      supplyAirSensor: TemperatureAndHumiditySensor<State.Sensors.Supply> = .default(location: "supply")
-    ) {
-      self.mixedAirSensor = mixedAirSensor
-      self.postCoilSensor = postCoilSensor
-      self.returnAirSensor = returnAirSensor
-      self.supplyAirSensor = supplyAirSensor
-    }
-    
-    public struct TemperatureAndHumiditySensor<Location>: Codable, Equatable {
-      public var temperature: String
-      public var humidity: String
-      public var dewPoint: String
-      public var enthalpy: String
-      
-      /// Create a new sensor topic container.
-      ///
-      /// - Parameters:
-      ///   - temperature: The temperature sensor topic.
-      ///   - humidity: The humidity sensor topic.
-      ///   - dewPoint: The dew point sensor topic.
-      public init(
-        temperature: String,
-        humidity: String,
-        dewPoint: String,
-        enthalpy: String
-      ) {
-        self.temperature = temperature
-        self.humidity = humidity
-        self.dewPoint = dewPoint
-        self.enthalpy = enthalpy
-      }
-    }
-  }
-  
-  /// A container for set point related topics used by the application.
-  public struct SetPoints: Codable, Equatable {
-    
-    /// The topic for the humidify set point.
-    public var humidify: Humidify
-    
-    /// The topics for dehumidification set points.
-    public var dehumidify: Dehumidify
-    
-    /// Create a new set point topic container.
-    ///
-    /// - Parameters:
-    ///   - humidify: The topic for humidification set points.
-    ///   - dehumidify: The topics for dehumidification set points.
-    public init(
-      humidify: Humidify = .init(),
-      dehumidify: Dehumidify = .init()
-    ) {
-      self.humidify = humidify
-      self.dehumidify = dehumidify
-    }
-    
-    /// A container for the humidification set point topics used by the application.
-    public struct Humidify: Codable, Equatable {
-      
-      /// The topic for dew point control mode set point.
-      public var dewPoint: String
-      
-      /// The topic for relative humidity control mode set point.
-      public var relativeHumidity: String
-      
-      /// Create a new container for the humidification set point topics.
-      ///
-      /// - Parameters:
-      ///   - dewPoint: The topic for dew point control mode set point.
-      ///   - relativeHumidity: The topic for relative humidity control mode set point.
-      public init(
-        dewPoint: String = "set_points/humidify/dew_point",
-        relativeHumidity: String = "set_points/humidify/relative_humidity"
-      ) {
-        self.dewPoint = dewPoint
-        self.relativeHumidity = relativeHumidity
-      }
-    }
-    
-    /// A container for dehumidifcation set point topics.
-    public struct Dehumidify: Codable, Equatable {
-      
-      /// A low setting for dew point control modes.
-      public var lowDewPoint: String
-      
-      /// A high setting for dew point control modes.
-      public var highDewPoint: String
-      
-      /// A low setting for relative humidity control modes.
-      public var lowRelativeHumidity: String
-      
-      /// A high setting for relative humidity control modes.
-      public var highRelativeHumidity: String
-      
-      /// Create a new container for dehumidification set point topics.
-      ///
-      /// - Parameters:
-      ///   - lowDewPoint: A low setting for dew point control modes.
-      ///   - highDewPoint: A high setting for dew point control modes.
-      ///   - lowRelativeHumidity: A low setting for relative humidity control modes.
-      ///   - highRelativeHumidity: A high setting for relative humidity control modes.
-      public init(
-        lowDewPoint: String = "set_points/dehumidify/low_dew_point",
-        highDewPoint: String = "set_points/dehumidify/high_dew_point",
-        lowRelativeHumidity: String = "set_points/dehumidify/low_relative_humidity",
-        highRelativeHumidity: String = "set_points/dehumidify/high_relative_humidity"
-      ) {
-        self.lowDewPoint = lowDewPoint
-        self.highDewPoint = highDewPoint
-        self.lowRelativeHumidity = lowRelativeHumidity
-        self.highRelativeHumidity = highRelativeHumidity
-      }
-    }
-  }
-  
-  /// A container for control state topics used by the application.
-  public struct States: Codable, Equatable {
-    
-    /// The topic for the control mode.
-    public var mode: String
-    
-    /// The relay state topics.
-    public var relays: Relays
-    
-    /// Create a new container for control state topics.
-    ///
-    /// - Parameters:
-    ///   - mode: The topic for the control mode.
-    public init(
-      mode: String = "states/mode",
-      relays: Relays = .init()
-    ) {
-      self.mode = mode
-      self.relays = relays
-    }
-    
-    /// A container for reading the current state of a relay.
-    public struct Relays: Codable, Equatable {
-      
-      /// The dehumidification stage-1 relay topic.
-      public var dehumdification1: String
-      
-      /// The dehumidification stage-2 relay topic.
-      public var dehumidification2: String
-      
-      /// The humidification relay topic.
-      public var humdification: String
-      
-      /// Create a new container for relay state topics.
-      ///
-      /// - Parameters:
-      ///   - dehumidification1: The dehumidification stage-1 relay topic.
-      ///   - dehumidification2: The dehumidification stage-2 relay topic.
-      ///   - humidification: The humidification relay topic.
-      public init(
-        dehumidefication1: String = "states/relays/dehumidification_1",
-        dehumidification2: String = "states/relays/dehumidification_2",
-        humidification: String = "states/relays/humidification"
-      ) {
-        self.dehumdification1 = dehumidefication1
-        self.dehumidification2 = dehumidification2
-        self.humdification = humidification
-      }
-    }
-  }
-  
-  /// A container for commands topics that the application can publish to.
-  public struct Commands: Codable, Equatable {
-    
-    /// The relay command topics.
-    public var relays: Relays
-    
-    /// Create a new command topics container.
-    ///
-    ///  - Parameters:
-    ///   - relays: The relay command topics.
-    public init(relays: Relays = .init()) {
-      self.relays = relays
-    }
-    
-    /// A container for relay command topics used by the application.
-    public struct Relays: Codable, Equatable {
-      
-      /// The dehumidification stage-1 relay topic.
-      public var dehumidification1: String
-      
-      /// The dehumidification stage-2 relay topic.
-      public var dehumidification2: String
-      
-      /// The humidification relay topic.
-      public var humidification: String
-      
-      /// Create a new container for commanding relays.
-      ///
-      /// - Parameters:
-      ///   - dehumidification1: The dehumidification stage-1 relay topic.
-      ///   - dehumidification2: The dehumidification stage-2 relay topic.
-      ///   - humidification: The humidification relay topic.
-      public init(
-        dehumidification1: String = "relays/dehumidification_1",
-        dehumidification2: String = "relays/dehumidification_2",
-        humidification: String = "relays/humidification"
-      ) {
-        self.dehumidification1 = dehumidification1
-        self.dehumidification2 = dehumidification2
-        self.humidification = humidification
-      }
-    }
-  }
-}
-
-// MARK: Helpers
-extension Topics.Sensors.TemperatureAndHumiditySensor {
-  public static func `default`(location: String) -> Self {
-    .init(
-      temperature: "sensors/\(location)/temperature",
-      humidity: "sensors/\(location)/humidity",
-      dewPoint: "sensors/\(location)/dew-point",
-      enthalpy: "sensors/\(location)/enthalpy"
-    )
-  }
-}

Sources/Models/TrackedChanges.swift

@@ -1,11 +1,20 @@
-
+/// A property wrapper that tracks changes of a property.
+///
+/// This allows values to only publish changes if they have changed since the
+/// last time they were recieved.
 @propertyWrapper
-public struct TrackedChanges<Value> {
+public struct TrackedChanges<Value: Sendable>: Sendable {
-  
+
+  /// The current tracking state.
   private var tracking: TrackingState
+
+  /// The current wrapped value.
   private var value: Value
-  private var isEqual: (Value, Value) -> Bool
+
-  
+  /// Used to check if a new value is equal to an old value.
+  private var isEqual: @Sendable (Value, Value) -> Bool
+
+  /// Access to the underlying property that we are wrapping.
   public var wrappedValue: Value {
     get { value }
     set {
@@ -16,22 +25,34 @@ public struct TrackedChanges<Value> {
       tracking = .needsProcessed
     }
   }
-  
+
+  /// Create a new property that tracks it's changes.
+  ///
+  /// - Parameters:
+  ///   - wrappedValue: The value that we are wrapping.
+  ///   - needsProcessed: Whether this value needs processed (default = false).
+  ///   - isEqual: Method to compare old values against new values.
   public init(
     wrappedValue: Value,
     needsProcessed: Bool = false,
-    isEqual: @escaping (Value, Value) -> Bool
+    isEqual: @escaping @Sendable (Value, Value) -> Bool
   ) {
     self.value = wrappedValue
     self.tracking = needsProcessed ? .needsProcessed : .hasProcessed
     self.isEqual = isEqual
   }
-  
+
+  /// Represents whether a wrapped value has changed and needs processed or not.
   enum TrackingState {
+
+    /// The state when nothing has changed and we've already processed the current value.
     case hasProcessed
+
+    /// The state when the value has changed and has not been processed yet.
     case needsProcessed
   }
-  
+
+  /// Whether the value needs processed.
   public var needsProcessed: Bool {
     get { tracking == .needsProcessed }
     set {
@@ -42,7 +63,7 @@ public struct TrackedChanges<Value> {
       }
     }
   }
-  
+
   public var projectedValue: Self {
     get { self }
     set { self = newValue }
@@ -54,11 +75,26 @@ extension TrackedChanges: Equatable where Value: Equatable {
     lhs.wrappedValue == rhs.wrappedValue
       && lhs.needsProcessed == rhs.needsProcessed
   }
-  
+
+  /// Create a new property that tracks it's changes, using the default equality check.
+  ///
+  /// - Parameters:
+  ///   - wrappedValue: The value that we are wrapping.
+  ///   - needsProcessed: Whether this value needs processed (default = false).
   public init(
     wrappedValue: Value,
     needsProcessed: Bool = false
   ) {
-    self.init(wrappedValue: wrappedValue, needsProcessed: needsProcessed, isEqual: ==)
+    self.init(wrappedValue: wrappedValue, needsProcessed: needsProcessed) {
+      $0 == $1
+    }
+  }
+}
+
+extension TrackedChanges: Hashable where Value: Hashable {
+
+  public func hash(into hasher: inout Hasher) {
+    hasher.combine(wrappedValue)
+    hasher.combine(needsProcessed)
   }
 }

Sources/SensorsService/SensorsService.swift

@@ -0,0 +1,212 @@
+import Dependencies
+import DependenciesMacros
+import Foundation
+import Logging
+import Models
+import MQTTManager
+import MQTTNIO
+import NIO
+import PsychrometricClient
+import ServiceLifecycle
+
+/// Service that is responsible for listening to changes of the temperature and humidity
+/// sensors, then publishing back the calculated dew-point temperature and enthalpy for
+/// the sensor location.
+///
+///
+public actor SensorsService: Service {
+
+  @Dependency(\.mqtt) var mqtt
+
+  /// The logger to use for the service.
+  private let logger: Logger?
+
+  /// The sensors that we are listening for updates to, so
+  /// that we can calculate the dew-point temperature and enthalpy
+  /// values to publish back to the MQTT broker.
+  private var sensors: [TemperatureAndHumiditySensor]
+
+  private var topics: [String] {
+    sensors.reduce(into: [String]()) { array, sensor in
+      array.append(sensor.topics.temperature)
+      array.append(sensor.topics.humidity)
+    }
+  }
+
+  /// Create a new sensors service that listens to the passed in
+  /// sensors.
+  ///
+  /// - Note: The service will fail to start if the array of sensors is not greater than 0.
+  ///
+  /// - Parameters:
+  ///   - sensors: The sensors to listen for changes to.
+  ///   - logger: An optional logger to use.
+  public init(
+    sensors: [TemperatureAndHumiditySensor],
+    logger: Logger? = nil
+  ) {
+    self.sensors = sensors
+    self.logger = logger
+  }
+
+  /// Start the service with graceful shutdown, which will attempt to publish
+  /// any pending changes to the MQTT broker, upon a shutdown signal.
+  public func run() async throws {
+    precondition(sensors.count > 0, "Sensors should not be empty.")
+
+    let stream = try await makeStream()
+
+    await withGracefulShutdownHandler {
+      for await result in stream.cancelOnGracefulShutdown() {
+        logger?.debug("Received result for topic: \(result.topic)")
+        await handleResult(result)
+      }
+    } onGracefulShutdown: {
+      self.logger?.debug("Received graceful shutdown.")
+      Task {
+        try await self.shutdown()
+      }
+    }
+  }
+
+  @_spi(Internal)
+  public func shutdown() async throws {
+    try await publishUpdates()
+  }
+
+  private func makeStream() async throws -> AsyncStream<(buffer: ByteBuffer, topic: String)> {
+    // ignore duplicate values, to prevent publishing dew-point and enthalpy
+    // changes to frequently.
+    try await mqtt.listen(to: topics)
+      .map { ($0.payload, $0.topicName) }
+      .removeDuplicates { lhs, rhs in
+        lhs.buffer == rhs.buffer
+          && lhs.topic == rhs.topic
+      }
+      .eraseToStream()
+  }
+
+  private func handleResult(_ result: (buffer: ByteBuffer, topic: String)) async {
+    do {
+      let topic = result.topic
+      assert(topics.contains(topic))
+      logger?.debug("Begin handling result for topic: \(topic)")
+
+      func decode<V: BufferInitalizable>(_: V.Type) -> V? {
+        return V(buffer: result.buffer)
+      }
+
+      if topic.contains("temperature") {
+        logger?.debug("Begin handling temperature result.")
+        guard let temperature = decode(DryBulb.self) else {
+          logger?.debug("Failed to decode temperature: \(result.buffer)")
+          throw DecodingError()
+        }
+        logger?.debug("Decoded temperature: \(temperature)")
+        try sensors.update(topic: topic, keyPath: \.temperature, with: temperature)
+
+      } else if topic.contains("humidity") {
+        logger?.debug("Begin handling humidity result.")
+        guard let humidity = decode(RelativeHumidity.self) else {
+          logger?.debug("Failed to decode humidity: \(result.buffer)")
+          throw DecodingError()
+        }
+        logger?.debug("Decoded humidity: \(humidity)")
+        try sensors.update(topic: topic, keyPath: \.humidity, with: humidity)
+      }
+
+      try await publishUpdates()
+      logger?.debug("Done handling result for topic: \(topic)")
+    } catch {
+      logger?.error("Received error while handling result: \(error)")
+    }
+  }
+
+  private func publish(_ double: Double?, to topic: String) async throws {
+    guard let double else { return }
+    try await mqtt.publish(
+      ByteBufferAllocator().buffer(string: "\(double)"),
+      to: topic,
+      qos: .exactlyOnce,
+      retain: true
+    )
+    logger?.debug("Published update to topic: \(topic)")
+  }
+
+  private func publishUpdates() async throws {
+    for sensor in sensors.filter(\.needsProcessed) {
+      try await publish(sensor.dewPoint?.fahrenheit, to: sensor.topics.dewPoint)
+      try await publish(sensor.enthalpy?.value, to: sensor.topics.enthalpy)
+      try sensors.hasProcessed(sensor)
+    }
+  }
+}
+
+// MARK: - Errors
+
+struct DecodingError: Error {}
+struct SensorNotFoundError: Error {}
+
+// MARK: - Helpers
+
+private extension TemperatureAndHumiditySensor.Topics {
+  func contains(_ topic: String) -> Bool {
+    temperature == topic || humidity == topic
+  }
+}
+
+private extension Array where Element == TemperatureAndHumiditySensor {
+
+  mutating func update<V>(
+    topic: String,
+    keyPath: WritableKeyPath<TemperatureAndHumiditySensor, V>,
+    with value: V
+  ) throws {
+    guard let index = firstIndex(where: { $0.topics.contains(topic) }) else {
+      throw SensorNotFoundError()
+    }
+    self[index][keyPath: keyPath] = value
+  }
+
+  mutating func hasProcessed(_ sensor: TemperatureAndHumiditySensor) throws {
+    guard let index = firstIndex(where: { $0.id == sensor.id }) else {
+      throw SensorNotFoundError()
+    }
+    self[index].needsProcessed = false
+  }
+}
+
+/// Represents a type that can be initialized by a ``ByteBuffer``.
+protocol BufferInitalizable {
+  init?(buffer: ByteBuffer)
+}
+
+extension Double: BufferInitalizable {
+
+  /// Attempt to create / parse a double from a byte buffer.
+  init?(buffer: ByteBuffer) {
+    let string = String(buffer: buffer)
+    self.init(string)
+  }
+}
+
+extension Tagged: BufferInitalizable where RawValue: BufferInitalizable {
+  init?(buffer: ByteBuffer) {
+    guard let value = RawValue(buffer: buffer) else { return nil }
+    self.init(value)
+  }
+}
+
+extension Humidity<Relative>: BufferInitalizable {
+  init?(buffer: ByteBuffer) {
+    guard let value = Double(buffer: buffer) else { return nil }
+    self.init(value)
+  }
+}
+
+extension Temperature<DryAir>: BufferInitalizable {
+  init?(buffer: ByteBuffer) {
+    guard let value = Double(buffer: buffer) else { return nil }
+    self.init(value, units: .celsius)
+  }
+}

Sources/TopicsLive/Live.swift

@@ -1,52 +0,0 @@
-import Models
-
-// TODO: Fix other live topics
-extension Topics {
-  
-  public static let live = Self.init(
-    commands: .init(),
-    sensors: .init(
-      mixedAirSensor: .live(location: .mixedAir),
-      postCoilSensor: .live(location: .postCoil),
-      returnAirSensor: .live(location: .return),
-      supplyAirSensor: .live(location: .supply)),
-    setPoints: .init(),
-    states: .init()
-  )
-}
-
-extension Topics.Sensors {
-  fileprivate enum Location: CustomStringConvertible {
-    case mixedAir
-    case postCoil
-    case `return`
-    case supply
-    
-    var description: String {
-      switch self {
-      case .mixedAir:
-        return "mixed_air"
-      case .postCoil:
-        return "post_coil"
-      case .return:
-        return "return"
-      case .supply:
-        return "supply"
-      }
-    }
-  }
-}
-
-extension Topics.Sensors.TemperatureAndHumiditySensor {
-  fileprivate static func live(
-    prefix: String = "frankensystem",
-    location: Topics.Sensors.Location
-  ) -> Self {
-    .init(
-      temperature: "\(prefix)/sensor/\(location.description)_temperature/state",
-      humidity: "\(prefix)/sensor/\(location.description)_humidity/state",
-      dewPoint: "\(prefix)/sensor/\(location.description)_dew_point/state",
-      enthalpy: "\(prefix)/sensor/\(location.description)_enthalpy/state"
-    )
-  }
-}

Sources/dewPoint-controller/main.swift

@@ -1,73 +0,0 @@
-import Bootstrap
-import ClientLive
-import CoreUnitTypes
-import Logging
-import Models
-import MQTTNIO
-import NIO
-import TopicsLive
-import Foundation
-
-var logger: Logger = {
-  var logger = Logger(label: "dewPoint-logger")
-  logger.logLevel = .debug
-  return logger
-}()
-
-logger.info("Starting Swift Dew Point Controller!")
-
-let eventLoopGroup = MultiThreadedEventLoopGroup(numberOfThreads: 1)
-var environment = try bootstrap(eventLoopGroup: eventLoopGroup, logger: logger, autoConnect: false).wait()
-
-// Set the log level to info only in production mode.
-if environment.envVars.appEnv == .production {
-  logger.logLevel = .info
-}
-
-// Set up the client, topics and state.
-environment.topics = .live
-let state = State()
-let client = Client.live(client: environment.mqttClient, state: state, topics: environment.topics)
-
-defer {
-  logger.debug("Disconnecting")
-}
-
-// Add topic listeners.
-client.addListeners()
-
-while true {
-  if !environment.mqttClient.isActive() {
-    logger.trace("Connecting to MQTT broker...")
-    try client.connect().wait()
-    try client.subscribe().wait()
-    Thread.sleep(forTimeInterval: 1)
-  }
-  
-  // Check if sensors need processed.
-  if state.sensors.needsProcessed {
-    logger.debug("Sensor state has changed...")
-    if state.sensors.mixedAirSensor.needsProcessed {
-      logger.trace("Publishing mixed air sensor.")
-      try client.publishSensor(.mixed(state.sensors.mixedAirSensor)).wait()
-    }
-    if state.sensors.postCoilSensor.needsProcessed {
-      logger.trace("Publishing post coil sensor.")
-      try client.publishSensor(.postCoil(state.sensors.postCoilSensor)).wait()
-    }
-    if state.sensors.returnAirSensor.needsProcessed {
-      logger.trace("Publishing return air sensor.")
-      try client.publishSensor(.return(state.sensors.returnAirSensor)).wait()
-    }
-    if state.sensors.supplyAirSensor.needsProcessed {
-      logger.trace("Publishing supply air sensor.")
-      try client.publishSensor(.supply(state.sensors.supplyAirSensor)).wait()
-    }
-  }
-
-//  logger.debug("Fetching dew point...")
-//
-//  logger.debug("Published dew point...")
-  
-  Thread.sleep(forTimeInterval: 5)
-}

Tests/CliClientTests/CliClientTests.swift

@@ -0,0 +1,212 @@
+@_spi(Internal) import CliClient
+import Dependencies
+import Foundation
+import Logging
+import Models
+import MQTTNIO
+import XCTest
+
+final class CliClientTests: XCTestCase {
+
+  override func invokeTest() {
+    withDependencies {
+      $0.cliClient = .liveValue
+      $0.environment = .liveValue
+      $0.environment.processInfo = { [:] }
+    } operation: {
+      super.invokeTest()
+    }
+  }
+
+  func testParsingMQTTVersion() {
+    @Dependency(\.cliClient) var cliClient
+
+    let arguments = [
+      (MQTTClient.Version.v3_1_1, ["3", "3.1", "3.1.1", "00367894"]),
+      (MQTTClient.Version.v5_0, ["5", "5.1", "5.1.1", "00000500012"]),
+      (nil, ["0", "0.1", "0.1.1", "0000000001267894", "blob"])
+    ]
+
+    for (version, strings) in arguments {
+      for string in strings {
+        XCTAssertEqual(cliClient.parseMqttClientVersion(string), version)
+      }
+    }
+
+    XCTAssertEqual(MQTTClient.Version.parseOrDefault(string: nil), .v3_1_1)
+  }
+
+  func testLogLevelFromEnvironment() {
+    @Dependency(\.cliClient) var cliClient
+
+    let arguments = [
+      (Logger.Level.debug, EnvVars(appEnv: .staging, logLevel: nil)),
+      (Logger.Level.debug, EnvVars(appEnv: .development, logLevel: nil)),
+      (Logger.Level.info, EnvVars(appEnv: .production, logLevel: nil)),
+      (Logger.Level.trace, EnvVars(appEnv: .testing, logLevel: nil)),
+      (Logger.Level.info, EnvVars(appEnv: .staging, logLevel: .info)),
+      (Logger.Level.trace, EnvVars(appEnv: .development, logLevel: .trace)),
+      (Logger.Level.warning, EnvVars(appEnv: .production, logLevel: .warning)),
+      (Logger.Level.debug, EnvVars(appEnv: .testing, logLevel: .debug))
+    ]
+
+    for (expected, envVars) in arguments {
+      XCTAssertEqual(expected, cliClient.logLevel(envVars))
+    }
+  }
+
+  func testMakeEnvVars() async throws {
+    @Dependency(\.cliClient) var cliClient
+    @Dependency(\.environment) var environment
+
+    let arguments = [
+      (
+        CliClient.EnvVarsRequest(envFilePath: nil, logger: nil, version: nil),
+        EnvVars()
+      ),
+      (
+        CliClient.EnvVarsRequest(envFilePath: nil, logger: nil, version: "3"),
+        EnvVars(version: "3")
+      ),
+      (
+        CliClient.EnvVarsRequest(
+          envFilePath: "test.env", // Needs to be a bundled resource.
+          logger: nil,
+          version: nil
+        ),
+        EnvVars.test
+      ),
+      (
+        CliClient.EnvVarsRequest(
+          envFilePath: "test-env.json", // Needs to be a bundled resource.
+          logger: nil,
+          version: nil
+        ),
+        EnvVars.test
+      )
+    ]
+
+    for (request, expectedEnvVars) in arguments {
+      var request = request
+      if let file = request.envFilePath {
+        request = .init(
+          envFilePath: cleanFilePath(file),
+          logger: request.logger,
+          version: request.mqttClientVersion
+        )
+      }
+      let result = try await cliClient.makeEnvVars(request)
+      XCTAssertEqual(result, expectedEnvVars)
+    }
+  }
+
+  func testMakeEnvVarsWithFailingDecoder() async throws {
+    try await withDependencies {
+      $0.environment.coders = { ThrowingDecoder() }
+    } operation: {
+      @Dependency(\.cliClient) var cliClient
+      let envVars = try await cliClient.makeEnvVars(.init())
+      XCTAssertEqual(envVars, EnvVars())
+    }
+  }
+
+  func testMakeEnvVarsWithFailingEncoder() async throws {
+    try await withDependencies {
+      $0.environment.coders = { ThrowingEncoder() }
+    } operation: {
+      @Dependency(\.cliClient) var cliClient
+      let envVars = try await cliClient.makeEnvVars(.init())
+      XCTAssertEqual(envVars, EnvVars())
+    }
+  }
+
+  func testFileType() {
+    let arguments = [
+      (EnvironmentDependency.FileType.dotEnv(path: "test.env"), "test.env"),
+      (EnvironmentDependency.FileType.json(path: "test.json"), "test.json"),
+      (nil, "test"),
+      (nil, "")
+    ]
+
+    for (expected, file) in arguments {
+      XCTAssertEqual(EnvironmentDependency.FileType(path: file), expected)
+    }
+  }
+
+  func testEnvironmentLiveValueProcessInfo() {
+    let environment = EnvironmentDependency.liveValue
+    XCTAssertEqual(environment.processInfo(), ProcessInfo.processInfo.environment)
+  }
+
+  func testMakeClient() throws {
+    @Dependency(\.cliClient) var cliClient
+    let envVars = EnvVars.test
+    let client = try cliClient.makeClient(.init(
+      environment: envVars,
+      eventLoopGroup: .init(numberOfThreads: 1),
+      logger: nil
+    ))
+
+    XCTAssertEqual(client.host, envVars.host)
+    XCTAssertEqual(client.port, Int(envVars.port!))
+    XCTAssertEqual(client.identifier, envVars.identifier)
+    XCTAssertEqual(client.configuration.version, .v5_0)
+    XCTAssertEqual(client.configuration.userName, envVars.userName)
+    XCTAssertEqual(client.configuration.password, envVars.password)
+
+    try client.syncShutdownGracefully()
+  }
+}
+
+// - MARK: Helper
+
+private func cleanFilePath(_ path: String) -> String {
+  #if os(Linux)
+    return "Tests/CliClientTests/\(path)"
+  #else
+    let split = path.split(separator: ".")
+    let fileName = split.first!
+    let ext = split.last!
+    let url = Bundle.module.url(forResource: String(fileName), withExtension: String(ext))!.absoluteString
+    let cleaned = url.split(separator: "file://").last!
+    return String(cleaned)
+  #endif
+}
+
+extension EnvVars {
+  static let test = EnvVars(
+    appEnv: .testing,
+    host: "test.mqtt",
+    port: "1234",
+    identifier: "testing-mqtt",
+    userName: "test-user",
+    password: "super-secret",
+    logLevel: .debug,
+    version: "5.0"
+  )
+}
+
+struct ThrowingDecoder: Coderable {
+
+  func encode<T>(_ instance: T) throws -> Data where T: Encodable {
+    try JSONEncoder().encode(instance)
+  }
+
+  func decode<T>(_ type: T.Type, from data: Data) throws -> T where T: Decodable {
+    throw DecodeError()
+  }
+}
+
+struct ThrowingEncoder: Coderable {
+
+  func encode<T>(_ instance: T) throws -> Data where T: Encodable {
+    throw EncodeError()
+  }
+
+  func decode<T>(_ type: T.Type, from data: Data) throws -> T where T: Decodable {
+    try JSONDecoder().decode(T.self, from: data)
+  }
+}
+
+struct DecodeError: Error {}
+struct EncodeError: Error {}

Tests/CliClientTests/test-env.json

@@ -0,0 +1,10 @@
+{
+  "APP_ENV": "testing",
+  "MQTT_HOST": "test.mqtt",
+  "MQTT_PORT": "1234",
+  "MQTT_IDENTIFIER": "testing-mqtt",
+  "MQTT_USERNAME": "test-user",
+  "MQTT_PASSWORD": "super-secret",
+  "LOG_LEVEL": "debug",
+  "MQTT_VERSION": "5.0"
+}

Tests/CliClientTests/test.env

@@ -0,0 +1,8 @@
+APP_ENV="testing"
+MQTT_HOST="test.mqtt"
+MQTT_PORT="1234"
+MQTT_IDENTIFIER="testing-mqtt"
+MQTT_USERNAME="test-user"
+MQTT_PASSWORD="super-secret"
+LOG_LEVEL="debug"
+MQTT_VERSION="5.0"

Tests/ClientTests/AsyncClientTests.swift

@@ -1,45 +0,0 @@
-import XCTest
-import EnvVars
-import Logging
-import Models
-@testable import ClientLive
-import Psychrometrics
-
-final class AsyncClientTests: XCTestCase {
-  
-  static let hostname = ProcessInfo.processInfo.environment["MOSQUITTO_SERVER"] ?? "localhost"
-  
-  static let logger: Logger = {
-    var logger = Logger(label: "AsyncClientTests")
-    logger.logLevel = .trace
-    return logger
-  }()
-  
-  func createClient(identifier: String) -> AsyncClient {
-    let envVars = EnvVars.init(
-      appEnv: .testing,
-      host: Self.hostname,
-      port: "1883",
-      identifier: identifier,
-      userName: nil,
-      password: nil
-    )
-    return .init(envVars: envVars, logger: Self.logger)
-  }
-  
-  func testConnectAndShutdown() async throws {
-    let client = createClient(identifier: "testConnectAndShutdown")
-    await client.connect()
-    await client.shutdown()
-  }
-  
-  func testPublishingSensor() async throws {
-    let client = createClient(identifier: "testPublishingSensor")
-    await client.connect()
-    let topic = Topics().sensors.mixedAirSensor.dewPoint
-    try await client.addPublishListener(topic: topic, decoding: Temperature.self)
-    try await client.publishSensor(.mixed(.init(temperature: 71.123, humidity: 50.5, needsProcessed: true)))
-    try await client.publishSensor(.mixed(.init(temperature: 72.123, humidity: 50.5, needsProcessed: true)))
-    await client.shutdown()
-  }
-}

Tests/ClientTests/ClientTests.swift

@@ -1,186 +0,0 @@
-import Client
-@testable import ClientLive
-import CoreUnitTypes
-import Foundation
-import Logging
-import Models
-import MQTTNIO
-import NIO
-import NIOConcurrencyHelpers
-import XCTest
-
-final class ClientLiveTests: XCTestCase {
-  static let hostname = ProcessInfo.processInfo.environment["MOSQUITTO_SERVER"] ?? "localhost"
-  let topics = Topics()
-  
-//  func test_mqtt_subscription() throws {
-//    let mqttClient = createMQTTClient(identifier: "test_subscription")
-//    _ = try mqttClient.connect().wait()
-//    let sub = try mqttClient.v5.subscribe(
-//      to: [mqttClient.mqttSubscription(topic: "test/subscription")]
-//    ).wait()
-//    XCTAssertEqual(sub.reasons[0], .grantedQoS1)
-//    try mqttClient.disconnect().wait()
-//    try mqttClient.syncShutdownGracefully()
-//  }
-  
-  func test_mqtt_listener() throws {
-    let lock = Lock()
-    var publishRecieved: [MQTTPublishInfo] = []
-    let payloadString = "test"
-    let payload = ByteBufferAllocator().buffer(string: payloadString)
-    
-    let client = self.createMQTTClient(identifier: "testMQTTListener_publisher")
-    _ = try client.connect().wait()
-    client.addPublishListener(named: "test") { result in
-      switch result {
-      case .success(let publish):
-        var buffer = publish.payload
-        let string = buffer.readString(length: buffer.readableBytes)
-        XCTAssertEqual(string, payloadString)
-        lock.withLock {
-          publishRecieved.append(publish)
-        }
-      case .failure(let error):
-        XCTFail("\(error)")
-      }
-    }
-    
-    try client.publish(to: "testMQTTSubscribe", payload: payload, qos: .atLeastOnce, retain: true).wait()
-    let sub = try client.v5.subscribe(to: [.init(topicFilter: "testMQTTSubscribe", qos: .atLeastOnce)]).wait()
-    XCTAssertEqual(sub.reasons[0], .grantedQoS1)
-    
-    Thread.sleep(forTimeInterval: 2)
-    lock.withLock {
-      XCTAssertEqual(publishRecieved.count, 1)
-    }
-    
-    try client.disconnect().wait()
-    try client.syncShutdownGracefully()
-    
-  }
-  
-  func test_client2_returnTemperature_listener() throws {
-    let mqttClient = createMQTTClient(identifier: "return-temperature-tests")
-    let state = State()
-    let topics = Topics()
-    let client = Client.live(client: mqttClient, state: state, topics: topics)
-    
-    client.addListeners()
-    try client.connect().wait()
-    try client.subscribe().wait()
-    
-    _ = try mqttClient.publish(
-      to: topics.sensors.returnAirSensor.temperature,
-      payload: ByteBufferAllocator().buffer(string: "75.1234"),
-      qos: .atLeastOnce
-    ).wait()
-    
-    Thread.sleep(forTimeInterval: 2)
-    
-    XCTAssertEqual(state.sensors.returnAirSensor.temperature, .celsius(75.1234))
-    try mqttClient.disconnect().wait()
-    try mqttClient.syncShutdownGracefully()
-
-//    try client.shutdown().wait()
-  }
-  
-  func test_client2_returnSensor_publish() throws {
-    let mqttClient = createMQTTClient(identifier: "return-temperature-tests")
-    let state = State()
-    let topics = Topics()
-    let client = Client.live(client: mqttClient, state: state, topics: topics)
-    
-    client.addListeners()
-    try client.connect().wait()
-    try client.subscribe().wait()
-    
-    _ = try mqttClient.publish(
-      to: topics.sensors.returnAirSensor.temperature,
-      payload: ByteBufferAllocator().buffer(string: "75.1234"),
-      qos: .atLeastOnce
-    ).wait()
-    
-    _ = try mqttClient.publish(
-      to: topics.sensors.returnAirSensor.humidity,
-      payload: ByteBufferAllocator().buffer(string: "\(50.0)"),
-      qos: .atLeastOnce
-    ).wait()
-    
-    Thread.sleep(forTimeInterval: 2)
-    XCTAssert(state.sensors.returnAirSensor.needsProcessed)
-    
-    try client.publishSensor(.return(state.sensors.returnAirSensor)).wait()
-    XCTAssertFalse(state.sensors.returnAirSensor.needsProcessed)
-    
-    try mqttClient.disconnect().wait()
-    try mqttClient.syncShutdownGracefully()
-
-//    try client.shutdown().wait()
-  }
-  
-//  func test_fetch_humidity() throws {
-//    let lock = Lock()
-//    let publishClient = createMQTTClient(identifier: "publishHumidity")
-//    let mqttClient = createMQTTClient(identifier: "fetchHumidity")
-//    _ = try publishClient.connect().wait()
-//    let client = try createClient(mqttClient: mqttClient)
-//    var humidityRecieved: [RelativeHumidity] = []
-//
-//    _ = try publishClient.publish(
-//      to: topics.sensors.humidity,
-//      payload: ByteBufferAllocator().buffer(string: "\(50.0)"),
-//      qos: .atLeastOnce
-//    ).wait()
-//
-//    Thread.sleep(forTimeInterval: 2)
-//    try publishClient.disconnect().wait()
-//    let humidity = try client.fetchHumidity(.init(topic: self.topics.sensors.humidity)).wait()
-//    XCTAssertEqual(humidity, 50)
-//    Thread.sleep(forTimeInterval: 2)
-//    lock.withLock {
-//      humidityRecieved.append(humidity)
-//    }
-//    try mqttClient.disconnect().wait()
-//    try mqttClient.syncShutdownGracefully()
-//  }
-  
-  // MARK: - Helpers
-  func createMQTTClient(identifier: String) -> MQTTNIO.MQTTClient {
-    MQTTNIO.MQTTClient(
-          host: Self.hostname,
-          port: 1883,
-          identifier: identifier,
-          eventLoopGroupProvider: .shared(eventLoopGroup),
-          logger: self.logger,
-          configuration: .init(version: .v5_0)
-      )
-  }
-  
-//  func createWebSocketClient(identifier: String) -> MQTTNIO.MQTTClient {
-//    MQTTNIO.MQTTClient(
-//          host: Self.hostname,
-//          port: 8080,
-//          identifier: identifier,
-//          eventLoopGroupProvider: .createNew,
-//          logger: self.logger,
-//          configuration: .init(useWebSockets: true, webSocketURLPath: "/mqtt")
-//      )
-//  }
-  
-  // Uses default topic names.
-//  func createClient(mqttClient: MQTTNIO.MQTTClient, autoConnect: Bool = true) throws -> Client.MQTTClient {
-//    if autoConnect {
-//      _ = try mqttClient.connect().wait()
-//    }
-//    return .live(client: mqttClient, topics: .init())
-//  }
-  
-  let logger: Logger = {
-      var logger = Logger(label: "MQTTTests")
-      logger.logLevel = .trace
-      return logger
-  }()
-  
-  let eventLoopGroup = MultiThreadedEventLoopGroup.init(numberOfThreads: 1)
-}

Tests/IntegrationTests/IntegrationTests.swift

@@ -0,0 +1,214 @@
+import Dependencies
+
+// @_spi(Internal) import dewpoint_controller
+import Logging
+import Models
+import MQTTConnectionService
+@_spi(Internal) import MQTTManager
+import MQTTNIO
+import NIO
+import PsychrometricClientLive
+@_spi(Internal) import SensorsService
+import ServiceLifecycle
+import ServiceLifecycleTestKit
+import XCTest
+
+final class IntegrationTests: XCTestCase {
+  static let hostname = ProcessInfo.processInfo.environment["MOSQUITTO_SERVER"] ?? "localhost"
+
+  static let logger: Logger = {
+    var logger = Logger(label: "IntegrationTests")
+    logger.logLevel = .info
+    return logger
+  }()
+
+  override func invokeTest() {
+    let client = createClient(identifier: "\(Self.self)")
+    withDependencies {
+      $0.mqtt = .live(client: client, logger: Self.logger)
+      $0.psychrometricClient = PsychrometricClient.liveValue
+    } operation: {
+      super.invokeTest()
+    }
+  }
+
+  func testConnectionServiceShutdown() async throws {
+    @Dependency(\.mqtt) var mqtt
+    do {
+      let service = MQTTConnectionService(logger: Self.logger)
+      let task = Task { try await service.run() }
+      defer { task.cancel() }
+
+      try await Task.sleep(for: .milliseconds(200))
+
+      // check the connection is active here.
+      try await mqtt.withClient { client in
+        XCTAssert(client.isActive())
+      }
+      mqtt.shutdown()
+
+      try await Task.sleep(for: .milliseconds(500))
+      // check the connection is active here.
+      try await mqtt.withClient { client in
+        XCTAssertFalse(client.isActive())
+      }
+    } catch {
+      mqtt.shutdown()
+      try await Task.sleep(for: .milliseconds(500))
+    }
+  }
+
+  func testMQTTConnectionStream() async throws {
+    let client = createClient(identifier: "testNonManagedStream")
+    let manager = MQTTManager.live(
+      client: client,
+      logger: Self.logger,
+      alwaysReconnect: false
+    )
+    defer { manager.shutdown() }
+    let connectionStream1 = MQTTConnectionStream(client: client, logger: Self.logger)
+    let connectionStream2 = MQTTConnectionStream(client: client, logger: Self.logger)
+    var events1 = [MQTTManager.Event]()
+    var events2 = [MQTTManager.Event]()
+
+    let stream1 = connectionStream1.start()
+    let stream2 = connectionStream2.start()
+
+    _ = try await manager.connect()
+
+    Task {
+      while !client.isActive() {
+        try await Task.sleep(for: .milliseconds(100))
+      }
+      try await Task.sleep(for: .milliseconds(200))
+      try await client.disconnect()
+      try await Task.sleep(for: .milliseconds(500))
+      manager.shutdown()
+      try await Task.sleep(for: .milliseconds(500))
+      connectionStream1.stop()
+      connectionStream2.stop()
+    }
+
+    for await event in stream1.removeDuplicates() {
+      events1.append(event)
+    }
+    for await event in stream2.removeDuplicates() {
+      events2.append(event)
+    }
+
+    XCTAssertEqual(events1, [.disconnected, .connected, .disconnected, .shuttingDown])
+    XCTAssertEqual(events2, [.disconnected, .connected, .disconnected, .shuttingDown])
+  }
+
+  func testListeningResumesAfterDisconnectThenReconnect() async throws {
+    struct TimeoutError: Error {}
+
+    let sensor = TemperatureAndHumiditySensor(location: .return)
+    let results = ResultContainer()
+
+    try await withDependencies {
+      $0.mqtt.publish = results.append
+    } operation: {
+      @Dependency(\.mqtt) var manager
+
+      let sensorsService = SensorsService(sensors: [sensor], logger: Self.logger)
+      let task = Task { try await sensorsService.run() }
+      defer { task.cancel() }
+
+      try await manager.connect()
+      defer { manager.shutdown() }
+
+      try await manager.withClient { client in
+        try await client.disconnect()
+        try await client.connect()
+
+        while !client.isActive() {
+          try await Task.sleep(for: .milliseconds(100))
+        }
+
+        // Give time to re-subscribe.
+        try await Task.sleep(for: .milliseconds(200))
+
+        try await client.publish(
+          to: sensor.topics.temperature,
+          payload: ByteBufferAllocator().buffer(string: "25"),
+          qos: .atLeastOnce,
+          retain: false
+        )
+        try await client.publish(
+          to: sensor.topics.humidity,
+          payload: ByteBufferAllocator().buffer(string: "50"),
+          qos: .atLeastOnce,
+          retain: false
+        )
+      }
+
+      var timeoutCount = 0
+      while !(await results.count == 2) {
+        guard timeoutCount < 20 else {
+          throw TimeoutError()
+        }
+        try await Task.sleep(for: .milliseconds(100))
+        timeoutCount += 1
+      }
+
+      let results = await results.results()
+
+      XCTAssertEqual(results.count, 2)
+      XCTAssert(results.contains(where: { $0.topicName == sensor.topics.dewPoint }))
+      XCTAssert(results.contains(where: { $0.topicName == sensor.topics.enthalpy }))
+      try await sensorsService.shutdown()
+    }
+  }
+
+  func createClient(identifier: String) -> MQTTClient {
+    let envVars = EnvVars(
+      appEnv: .testing,
+      host: Self.hostname,
+      port: "1883",
+      identifier: identifier,
+      userName: nil,
+      password: nil
+    )
+    let eventLoopGroup = MultiThreadedEventLoopGroup(numberOfThreads: 1)
+    // return .init(envVars: envVars, eventLoopGroup: eventLoopGroup, logger: Self.logger)
+    let config = MQTTClient.Configuration(
+      version: .v3_1_1,
+      userName: envVars.userName,
+      password: envVars.password,
+      useSSL: false,
+      useWebSockets: false,
+      tlsConfiguration: nil,
+      webSocketURLPath: nil
+    )
+    return .init(
+      host: Self.hostname,
+      identifier: identifier,
+      eventLoopGroupProvider: .shared(eventLoopGroup),
+      logger: Self.logger,
+      configuration: config
+    )
+  }
+}
+
+// - MARK: Helpers
+struct TopicNotFoundError: Error {}
+
+actor ResultContainer: Sendable {
+
+  private var storage = [MQTTManager.PublishRequest]()
+
+  init() {}
+
+  @Sendable func append(_ result: MQTTManager.PublishRequest) async {
+    storage.append(result)
+  }
+
+  var count: Int {
+    get async { storage.count }
+  }
+
+  func results() async -> [MQTTManager.PublishRequest] {
+    storage
+  }
+}

Tests/dewPoint-controllerTests/dewPoint_controllerTests.swift

@@ -1,47 +0,0 @@
-import XCTest
-import class Foundation.Bundle
-
-//final class dewPoint_controllerTests: XCTestCase {
-//    func testExample() throws {
-//        // This is an example of a functional test case.
-//        // Use XCTAssert and related functions to verify your tests produce the correct
-//        // results.
-//
-//        // Some of the APIs that we use below are available in macOS 10.13 and above.
-//        guard #available(macOS 10.13, *) else {
-//            return
-//        }
-//
-//        // Mac Catalyst won't have `Process`, but it is supported for executables.
-//        #if !targetEnvironment(macCatalyst)
-//
-//        let fooBinary = productsDirectory.appendingPathComponent("dewPoint-controller")
-//
-//        let process = Process()
-//        process.executableURL = fooBinary
-//
-//        let pipe = Pipe()
-//        process.standardOutput = pipe
-//
-//        try process.run()
-//        process.waitUntilExit()
-//
-//        let data = pipe.fileHandleForReading.readDataToEndOfFile()
-//        let output = String(data: data, encoding: .utf8)
-//
-//        XCTAssertEqual(output, "Hello, world!\n")
-//        #endif
-//    }
-//
-//    /// Returns path to the built products directory.
-//    var productsDirectory: URL {
-//      #if os(macOS)
-//        for bundle in Bundle.allBundles where bundle.bundlePath.hasSuffix(".xctest") {
-//            return bundle.bundleURL.deletingLastPathComponent()
-//        }
-//        fatalError("couldn't find the products directory")
-//      #else
-//        return Bundle.main.bundleURL
-//      #endif
-//    }
-//}

docker-compose.yaml

@@ -1,47 +0,0 @@
-# run this with docker-compose -f docker/docker-compose.yml run test
-services:
-  server:
-    image: swift-mqtt-dewpoint:latest
-    env_file: .env
-    command: /bin/bash -xc "./dewPoint-controller"
-
-  test:
-    image: swift:latest
-    #build:
-    #context: ./
-    platform: linux/amd64
-    working_dir: /app
-    networks:
-      - test
-    volumes:
-      - .:/app
-    depends_on:
-      - mosquitto-test
-    environment:
-      - MOSQUITTO_SERVER=mosquitto-test
-    command: /bin/bash -xc "swift package clean && swift test"
-
-  mosquitto-test:
-    image: eclipse-mosquitto
-    networks:
-      - test
-    volumes:
-      - ./mosquitto/config:/mosquitto/config
-      - ./mosquitto/certs:/mosquitto/certs
-
-  mosquitto:
-    image: eclipse-mosquitto
-    volumes:
-      - ./mosquitto/config:/mosquitto/config
-      - ./mosquitto/certs:/mosquitto/certs
-    ports:
-      - "1883:1883"
-      - "8883:8883"
-      - "8080:8080"
-      - "8081:8081"
-
-networks:
-  test:
-    driver: bridge
-    external: false
-

docker/Dockerfile

@@ -0,0 +1,15 @@
+# Used this to build the release version of the image.
+# Build the executable
+ARG SWIFT_IMAGE_VERSION="5.10"
+
+FROM swift:${SWIFT_IMAGE_VERSION} AS build
+WORKDIR /build
+COPY ./Package.* ./
+RUN swift package resolve
+COPY . .
+RUN swift build -c release -Xswiftc -g
+
+# Run image
+FROM swift:${SWIFT_IMAGE_VERSION}-slim
+COPY --from=build /build/.build/release/dewpoint-controller /usr/local/bin
+CMD ["/bin/bash", "-xc", "/usr/local/bin/dewpoint-controller run"]

docker/Dockerfile.mosquitto

@@ -0,0 +1,5 @@
+# Used to build a local MQTT broker for development and
+# testing.
+FROM eclipse-mosquitto:latest
+COPY ./mosquitto/config/mosquitto.conf /mosquitto/config/mosquitto.conf
+EXPOSE 1883

docker/Dockerfile.test

@@ -0,0 +1,9 @@
+# Used to build a test image.
+ARG SWIFT_IMAGE_VERSION="5.10"
+FROM swift:${SWIFT_IMAGE_VERSION}
+WORKDIR /app
+COPY ./Package.* ./
+RUN swift package resolve
+COPY . .
+RUN swift build
+CMD ["/bin/bash", "-xc", "swift", "test"]

docker/docker-compose-test.yaml

@@ -0,0 +1,19 @@
+# run this with docker-compose run test
+name: swift-mqtt-dewpoint-test
+
+services:
+  test:
+    build:
+      context: ..
+      dockerfile: docker/Dockerfile.test
+    working_dir: /app
+    depends_on:
+      - mosquitto
+    environment:
+      - MOSQUITTO_SERVER=mosquitto
+    command: /bin/bash -xc "swift test"
+
+  mosquitto:
+    build:
+      context: ..
+      dockerfile: docker/Dockerfile.mosquitto

docker/docker-compose.yaml

@@ -0,0 +1,20 @@
+# run this with docker-compose run dewpoint_controller
+name: swift-mqtt-dewpoint
+
+services:
+  dewpoint_controller:
+    container_name: dewpoint-controller
+    build:
+      context: ..
+      dockerfile: docker/Dockerfile
+    depends_on:
+      - mosquitto
+    environment:
+      - MQTT_HOST=mosquitto
+
+  mosquitto:
+    build:
+      context: ..
+      dockerfile: docker/Dockerfile.mosquitto
+    ports:
+      - "1883:1883"