feat: Begins using swift argument parser and creating cli client dependency

Sources/DewPointController/Application.swift

@@ -1,3 +1,4 @@
+import ArgumentParser
 import Dependencies
 import Foundation
 import Logging
@@ -11,106 +12,10 @@ import SensorsService
 import ServiceLifecycle
 
 @main
-struct Application {
-
-  /// The main entry point of the application.
-  static func main() async throws {
-    let eventloopGroup = MultiThreadedEventLoopGroup(numberOfThreads: 1)
-    var logger = Logger(label: "dewpoint-controller")
-    logger.logLevel = .trace
-
-    logger.info("Starting dewpoint-controller!")
-
-    let environment = loadEnvVars(logger: logger)
-
-    if environment.appEnv == .production {
-      logger.debug("Updating logging level to info.")
-      logger.logLevel = .info
-    }
-
-    let mqtt = MQTTClient(
-      envVars: environment,
-      eventLoopGroup: eventloopGroup,
-      logger: logger
-    )
-
-    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
-        )
-        serviceGroupConfiguration.maximumCancellationDuration = .seconds(5)
-        serviceGroupConfiguration.maximumGracefulShutdownDuration = .seconds(10)
-
-        let serviceGroup = ServiceGroup(configuration: serviceGroupConfiguration)
-
-        try await serviceGroup.run()
-      }
-
-      try await mqtt.shutdown()
-      try await eventloopGroup.shutdownGracefully()
-    } catch {
-      try await eventloopGroup.shutdownGracefully()
-    }
-  }
-}
-
-// MARK: - Helpers
-
-private func loadEnvVars(logger: Logger) -> EnvVars {
-  let defaultEnvVars = EnvVars()
-  let encoder = JSONEncoder()
-  let decoder = JSONDecoder()
-
-  let defaultEnvDict = (try? encoder.encode(defaultEnvVars))
-    .flatMap { try? decoder.decode([String: String].self, from: $0) }
-    ?? [:]
-
-  let envVarsDict = defaultEnvDict
-    .merging(ProcessInfo.processInfo.environment, uniquingKeysWith: { $1 })
-
-  let envVars = (try? JSONSerialization.data(withJSONObject: envVarsDict))
-    .flatMap { try? decoder.decode(EnvVars.self, from: $0) }
-    ?? defaultEnvVars
-
-  logger.debug("Done loading EnvVars...")
-
-  return envVars
-}
-
-private extension MQTTNIO.MQTTClient {
-  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: .v3_1_1,
-        disablePing: false,
-        userName: envVars.userName,
-        password: envVars.password
-      )
-    )
-  }
-}
-
-private extension Array where Element == TemperatureAndHumiditySensor {
-  static var live: Self {
-    TemperatureAndHumiditySensor.Location.allCases.map { location in
-      TemperatureAndHumiditySensor(location: location)
-    }
-  }
+struct Application: AsyncParsableCommand {
+  static let configuration = CommandConfiguration(
+    commandName: "dewpoint-controller",
+    abstract: "Command for running the dewpoint mqtt service.",
+    subcommands: [Run.self, Debug.self]
+  )
 }