feat: Finishes filter pressure drop calculator

Dockerfile

@@ -1,8 +1,14 @@
+# NOTE: Builds currently fail when building in release mode.
+
+ARG SWIFT_MODE="debug"
+
 # ================================
 # Build image
 # ================================
 FROM swift:6.0-noble AS build
 
+ARG SWIFT_MODE
+
 # Install OS updates
 RUN export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true \
     && apt-get -q update \
@@ -17,7 +23,7 @@ WORKDIR /build
 # as long as your Package.swift/Package.resolved
 # files do not change.
 COPY ./Package.* ./
-RUN swift package resolve \
+RUN --mount=type=cache,target=/build/.build swift package resolve \
   $([ -f ./Package.resolved ] && echo "--force-resolved-versions" || true)
 
 # Copy entire repo into container
@@ -25,22 +31,27 @@ COPY . .
 
 # Build the application, with optimizations, with static linking, and using jemalloc
 # N.B.: The static version of jemalloc is incompatible with the static Swift runtime.
-RUN swift build -c release \
+RUN --mount=type=cache,target=/build/.build swift build \
+  -c ${SWIFT_MODE} \
   --product App \
   --static-swift-stdlib \
+  -Xswiftc -g \
   -Xlinker -ljemalloc
 
 # Switch to the staging area
 WORKDIR /staging
 
 # Copy main executable to staging area
-RUN cp "$(swift build --package-path /build -c release --show-bin-path)/App" ./
+RUN --mount=type=cache,target=/build/.build cp \
+  "$(swift build --package-path /build -c ${SWIFT_MODE} --show-bin-path)/App" ./
 
 # Copy static swift backtracer binary to staging area
-RUN cp "/usr/libexec/swift/linux/swift-backtrace-static" ./
+RUN --mount=type=cache,target=/build/.build \
+  cp "/usr/libexec/swift/linux/swift-backtrace-static" ./
 
 # Copy resources bundled by SPM to staging area
-RUN find -L "$(swift build --package-path /build -c release --show-bin-path)/" -regex '.*\.resources$' -exec cp -Ra {} ./ \;
+RUN --mount=type=cache,target=/build/.build \
+  find -L "$(swift build --package-path /build -c ${SWIFT_MODE} --show-bin-path)/" -regex '.*\.resources$' -exec cp -Ra {} ./ \;
 
 # Copy any resources from the public directory and views directory if the directories exist
 # Ensure that by default, neither the directory nor any of its contents are writable.

Dockerfile.dev

@@ -1,4 +1,66 @@
-FROM swift:6.0-noble
+# NOTE: Builds currently fail when building in release mode.
+
+ARG SWIFT_MODE="debug"
+# ================================
+# Build image
+# ================================
+FROM swift:6.0-noble AS build
+
+ARG SWIFT_MODE
+
+# Install OS updates
+RUN export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true \
+    && apt-get -q update \
+    && apt-get -q dist-upgrade -y \
+    && apt-get install -y libjemalloc-dev
+
+# Set up a build area
+WORKDIR /build
+
+# First just resolve dependencies.
+# This creates a cached layer that can be reused
+# as long as your Package.swift/Package.resolved
+# files do not change.
+COPY ./Package.* ./
+RUN --mount=type=cache,target=/build/.build swift package resolve \
+  $([ -f ./Package.resolved ] && echo "--force-resolved-versions" || true)
+
+# Copy entire repo into container
+COPY . .
+
+# Build the application, with optimizations, with static linking, and using jemalloc
+# N.B.: The static version of jemalloc is incompatible with the static Swift runtime.
+RUN --mount=type=cache,target=/build/.build swift build \
+  -c ${SWIFT_MODE} \
+  --product App \
+  --static-swift-stdlib \
+  -Xswiftc -g \
+  -Xlinker -ljemalloc
+
+# Switch to the staging area
+WORKDIR /staging
+
+# Copy main executable to staging area
+RUN --mount=type=cache,target=/build/.build cp \
+  "$(swift build --package-path /build -c ${SWIFT_MODE} --show-bin-path)/App" ./
+
+# Copy static swift backtracer binary to staging area
+RUN --mount=type=cache,target=/build/.build \
+  cp "/usr/libexec/swift/linux/swift-backtrace-static" ./
+
+# Copy resources bundled by SPM to staging area
+RUN --mount=type=cache,target=/build/.build \
+  find -L "$(swift build --package-path /build -c ${SWIFT_MODE} --show-bin-path)/" -regex '.*\.resources$' -exec cp -Ra {} ./ \;
+
+# Copy any resources from the public directory and views directory if the directories exist
+# Ensure that by default, neither the directory nor any of its contents are writable.
+RUN [ -d /build/Public ] && { mv /build/Public ./Public && chmod -R a-w ./Public; } || true
+RUN [ -d /build/Resources ] && { mv /build/Resources ./Resources && chmod -R a-w ./Resources; } || true
+
+# ================================
+# Run image
+# ================================
+FROM ubuntu:noble
 
 # Make sure all system packages are up to date, and install only essential packages.
 RUN export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true \
@@ -10,23 +72,29 @@ RUN export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true \
       tzdata \
 # If your app or its dependencies import FoundationNetworking, also install `libcurl4`.
       libcurl4 \
+      curl \
 # If your app or its dependencies import FoundationXML, also install `libxml2`.
       # libxml2 \
-      sqlite3 \
     && rm -r /var/lib/apt/lists/*
 
-# Set up a build area
+# Create a vapor user and group with /app as its home directory
+RUN useradd --user-group --create-home --system --skel /dev/null --home-dir /app vapor
+
+# Switch to the new home directory
 WORKDIR /app
 
-# First just resolve dependencies.
-# This creates a cached layer that can be reused
-# as long as your Package.swift/Package.resolved
-# files do not change.
-COPY ./Package.* ./
-RUN swift package resolve \
-  $([ -f ./Package.resolved ] && echo "--force-resolved-versions" || true)
+# Copy built executable and any staged resources from builder
+COPY --from=build --chown=vapor:vapor /staging /app
 
-# Copy entire repo into container
-COPY . .
+# Provide configuration needed by the built-in crash reporter and some sensible default behaviors.
+ENV SWIFT_BACKTRACE=enable=yes,sanitize=yes,threads=all,images=all,interactive=no,swift-backtrace=./swift-backtrace-static
 
-CMD ["swift", "test"]
+# Ensure all further commands run as the vapor user
+USER vapor:vapor
+
+# Let Docker bind to port 8080
+EXPOSE 8080
+
+# Start the Vapor service when the image is run, default to listening on 8080 in production environment
+ENTRYPOINT ["./App"]
+CMD ["serve", "--env", "production", "--hostname", "0.0.0.0", "--port", "8080"]

Package.swift

@@ -107,5 +107,6 @@ var swiftSettings: [SwiftSetting] { [
   .enableExperimentalFeature("StrictConcurrency=complete"),
   .enableUpcomingFeature("ExistentialAny"),
   .enableUpcomingFeature("ConciseMagicFile"),
-  .enableUpcomingFeature("ForwardTrailingClosures")
+  .enableUpcomingFeature("ForwardTrailingClosures"),
+  .enableUpcomingFeature("InferSendableFromCaptures")
 ] }

Sources/ApiController/ApiController.swift

@@ -42,8 +42,7 @@ extension ApiController: DependencyKey {
 
       case let .calculateFilterPressureDrop(request):
         logger.debug("Calculating filter pressure drop: \(request)")
-        // FIX:
-        fatalError()
+        return try await request.respond(logger: logger)
 
       case let .calculateHVACSystemPerformance(request):
         logger.debug("Calculating hvac system performance: \(request)")

Sources/ApiController/Extensions/FilterPressureDrop.swift

@@ -0,0 +1,156 @@
+import Foundation
+import Logging
+import Routes
+
+public extension FilterPressureDrop.Request {
+
+  func respond(logger: Logger) async throws -> FilterPressureDrop.Response {
+    switch self {
+    case let .basic(request):
+      return try request.respond(logger: logger)
+    case let .fanLaw(request):
+      return try request.respond(logger: logger)
+    }
+  }
+
+}
+
+private extension FilterPressureDrop.Request.Basic {
+
+  func respond(logger: Logger) throws -> FilterPressureDrop.Response {
+    try validate()
+
+    let cfmPerTon = Double(climateZone.cfmPerTon)
+    let totalCFM = systemSize * cfmPerTon
+    // calculate filter area in sq. ft.
+    let filterArea = (filterWidth * filterHeight) / 144
+    let filterVelocity = totalCFM / filterArea
+    let initialPressureDrop = filterType.initialPressureDrop(velocity: filterVelocity)
+    let maxPressureDrop = 0.15
+
+    var warnings = [String]()
+
+    if filterVelocity > 350 {
+      warnings.append(
+        """
+        Face velocity exceeds 350 FPM - consider using a larger filter to reduce pressure drop and
+        improve system efficiency.
+        """
+      )
+    }
+
+    if initialPressureDrop > (maxPressureDrop / 2) {
+      warnings.append(
+        """
+        Initial pressure drop is more than 50% of maximum allowable - consider using a larger filter or different
+        filter type with lower initial pressure drop.
+        """
+      )
+    }
+
+    return .basic(.init(
+      filterArea: filterArea,
+      feetPerMinute: filterVelocity,
+      initialPressureDrop: initialPressureDrop,
+      maxPressureDrop: maxPressureDrop,
+      warnings: warnings
+    ))
+  }
+
+  func validate() throws {
+    guard systemSize > 0 else {
+      throw ValidationError(message: "System size should be greater than 0.")
+    }
+    guard filterWidth > 0 else {
+      throw ValidationError(message: "Filter width should be greater than 0.")
+    }
+    guard filterHeight > 0 else {
+      throw ValidationError(message: "Filter height should be greater than 0.")
+    }
+  }
+}
+
+private extension FilterPressureDrop.Request.FanLaw {
+
+  func respond(logger: Logger) throws -> FilterPressureDrop.Response {
+    try validate()
+
+    // calculate filter area in square ft.
+    let filterArea = (filterWidth * filterHeight) / 144
+    let faceVelocity = designAirflow / filterArea
+    let velocityRatio = designAirflow / ratedAirflow
+    let pressureRatio = pow(velocityRatio, 2)
+    let predictedPressureDrop = ratedPressureDrop * pressureRatio
+
+    return .fanLaw(.init(
+      predictedPressureDrop: predictedPressureDrop,
+      velocityRatio: velocityRatio,
+      pressureRatio: pressureRatio,
+      faceVelocity: faceVelocity
+    ))
+  }
+
+  func validate() throws {
+    guard filterWidth > 0 else {
+      throw ValidationError(message: "Filter width should be greater than 0.")
+    }
+    guard filterHeight > 0 else {
+      throw ValidationError(message: "Filter height should be greater than 0.")
+    }
+    guard filterDepth > 0 else {
+      throw ValidationError(message: "Filter depth should be greater than 0.")
+    }
+    guard ratedAirflow > 0 else {
+      throw ValidationError(message: "Rated airflow should be greater than 0.")
+    }
+    guard ratedPressureDrop > 0 else {
+      throw ValidationError(message: "Rated pressure drop should be greater than 0.")
+    }
+    guard designAirflow > 0 else {
+      throw ValidationError(message: "Design airflow should be greater than 0.")
+    }
+  }
+}
+
+extension FilterPressureDrop.FilterType {
+
+  // swiftlint:disable cyclomatic_complexity
+  func initialPressureDrop(velocity: Double) -> Double {
+    switch self {
+    case .fiberglass:
+      if velocity <= 300 {
+        return 0.05
+      } else if velocity <= 350 {
+        return 0.08
+      } else {
+        return 0.12
+      }
+    case .pleatedBasic:
+      if velocity <= 300 {
+        return 0.08
+      } else if velocity <= 350 {
+        return 0.12
+      } else {
+        return 0.15
+      }
+    case .pleatedBetter:
+      if velocity <= 300 {
+        return 0.15
+      } else if velocity <= 350 {
+        return 0.18
+      } else {
+        return 0.22
+      }
+    case .pleatedBest:
+      if velocity <= 300 {
+        return 0.20
+      } else if velocity <= 350 {
+        return 0.25
+      } else {
+        return 0.3
+      }
+    }
+  }
+
+  // swiftlint:enable cyclomatic_complexity
+}

Sources/Routes/Models/FilterPressureDrop.swift

@@ -15,11 +15,11 @@ public enum FilterPressureDrop {
 
     public struct Basic: Codable, Equatable, Sendable {
 
-      let systemSize: Double
-      let climateZone: ClimateZone
-      let filterType: FilterType
-      let filterWidth: Double
-      let filterHeight: Double
+      public let systemSize: Double
+      public let climateZone: ClimateZone
+      public let filterType: FilterType
+      public let filterWidth: Double
+      public let filterHeight: Double
 
       public init(
         systemSize: Double,
@@ -38,12 +38,12 @@ public enum FilterPressureDrop {
 
     public struct FanLaw: Codable, Equatable, Sendable {
 
-      let filterWidth: Double
-      let filterHeight: Double
-      let filterDepth: Double
-      let ratedAirflow: Double
-      let ratedPressureDrop: Double
-      let designAirflow: Double
+      public let filterWidth: Double
+      public let filterHeight: Double
+      public let filterDepth: Double
+      public let ratedAirflow: Double
+      public let ratedPressureDrop: Double
+      public let designAirflow: Double
 
       public init(
         filterWidth: Double,

Sources/ViewController/HomePage.swift

@@ -44,7 +44,7 @@ struct HomePage: HTML, Sendable {
         route: .capacitor(.index)
       )
       group(
-        label: "Filter Pressure Drop",
+        label: "Filter Sizing",
         description: FilterPressureDrop.description,
         svg: .funnel,
         route: .filterPressureDrop(.index)

Sources/ViewController/Live.swift

@@ -103,15 +103,10 @@ extension ViewController: DependencyKey {
       case let .filterPressureDrop(route):
         switch route {
         case let .index(mode: mode):
-          // FIX: remove response.
-          #if DEBUG
-            return request.respond(FilterPressureDropForm(mode: mode, response: .mock(mode: mode ?? .basic)))
-          #else
           return request.respond(FilterPressureDropForm(mode: mode, response: nil))
-          #endif
-        case .submit:
-          // FIX: implement.
-          fatalError()
+        case let .submit(request):
+          let response = try await request.respond(logger: logger)
+          return FilterPressureDropResponse(response: response)
         }
 
       case let .hvacSystemPerformance(route):

Sources/ViewController/Views/FilterPressureDrop.swift

@@ -25,9 +25,6 @@ struct FilterPressureDropForm: HTML, Sendable {
       .attributes(.class("mb-6"))
     }
 
-    // FIX: Remove when done.
-    WarningBox("This is under construction and does not work currently.")
-
     form(
       .hx.post(route: .filterPressureDrop(.index)),
       .hx.target("#result")
@@ -41,8 +38,6 @@ struct FilterPressureDropForm: HTML, Sendable {
         }
         div {
           SubmitButton(label: "Calculate Pressure Drop")
-            // FIX: Remove when done.
-            .attributes(.disabled)
         }
       }
     }
@@ -127,7 +122,7 @@ struct FilterPressureDropForm: HTML, Sendable {
                 .attributes(.type(.number), .step("0.1"), .min("0.1"), .required)
             }
             LabeledContent(label: "Filter Pressure Drop: (in. w.c.)") {
-              Input(id: "ratedPressure", placeholder: "Rated or measured pressure drop")
+              Input(id: "ratedPressureDrop", placeholder: "Rated or measured pressure drop")
                 .attributes(.type(.number), .step("0.1"), .min("0.1"), .required)
             }
             LabeledContent(label: "Design Airflow: (CFM)") {