71 lines
1.9 KiB
Swift
71 lines
1.9 KiB
Swift
import Dependencies
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import DependenciesMacros
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import Foundation
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import Logging
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import Models
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import ServiceLifecycle
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/// Represents the interface needed for the ``MQTTConnectionService``.
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///
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/// See ``MQTTConnectionManagerLive`` module for live implementation.
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@DependencyClient
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public struct MQTTConnectionManager: Sendable {
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public var connect: @Sendable () async throws -> AsyncStream<Event>
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public var shutdown: () -> Void
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public enum Event: Sendable {
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case connected
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case disconnected
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case shuttingDown
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}
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}
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extension MQTTConnectionManager: TestDependencyKey {
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public static var testValue: MQTTConnectionManager {
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Self()
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}
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}
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public extension DependencyValues {
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/// A dependency that is responsible for managing the connection to
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/// an MQTT broker.
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var mqttConnectionManager: MQTTConnectionManager {
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get { self[MQTTConnectionManager.self] }
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set { self[MQTTConnectionManager.self] = newValue }
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}
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}
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// MARK: - MQTTConnectionService
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public actor MQTTConnectionService: Service {
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@Dependency(\.mqttConnectionManager) var manager
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private nonisolated let logger: Logger?
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public init(
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logger: Logger? = nil
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) {
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self.logger = logger
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}
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/// The entry-point of the service which starts the connection
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/// to the MQTT broker and handles graceful shutdown of the
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/// connection.
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public func run() async throws {
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try await withGracefulShutdownHandler {
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let stream = try await manager.connect()
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for await event in stream.cancelOnGracefulShutdown() {
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// We don't really need to do anything with the events, so just logging
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// for now. But we need to iterate on an async stream for the service to
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// continue to run and handle graceful shutdowns.
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logger?.trace("Received connection event: \(event)")
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}
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manager.shutdown()
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} onGracefulShutdown: {
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self.logger?.trace("Received graceful shutdown.")
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}
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}
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}
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