124 lines
3.2 KiB
Swift
124 lines
3.2 KiB
Swift
import Foundation
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import Logging
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import Models
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import MQTTNIO
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import NIO
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import ServiceLifecycle
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/// Manages the MQTT broker connection.
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public actor MQTTConnectionService: Service {
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private let cleanSession: Bool
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private let client: MQTTClient
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private let internalEventStream: ConnectionStream
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nonisolated var logger: Logger { client.logger }
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private let name: String
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public init(
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cleanSession: Bool = true,
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client: MQTTClient
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) {
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self.cleanSession = cleanSession
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self.client = client
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self.internalEventStream = .init()
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self.name = UUID().uuidString
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}
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deinit {
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self.logger.debug("MQTTConnectionService is gone.")
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self.internalEventStream.stop()
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}
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/// The entry-point of the service.
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///
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/// This method connects to the MQTT broker and manages the connection.
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/// It will attempt to gracefully shutdown the connection upon receiving
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/// a shutdown signals.
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public func run() async throws {
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await withGracefulShutdownHandler {
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await withDiscardingTaskGroup { group in
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group.addTask { await self.connect() }
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group.addTask {
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await self.internalEventStream.start { self.client.isActive() }
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}
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for await event in self.internalEventStream.events.cancelOnGracefulShutdown() {
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if event == .shuttingDown {
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break
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}
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self.logger.trace("Sending connection event: \(event)")
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}
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group.cancelAll()
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}
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} onGracefulShutdown: {
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self.logger.trace("Received graceful shutdown.")
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self.shutdown()
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}
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}
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func connect() async {
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do {
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try await client.connect(cleanSession: cleanSession)
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client.addCloseListener(named: name) { _ in
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Task {
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self.logger.debug("Connection closed.")
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self.logger.debug("Reconnecting...")
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await self.connect()
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}
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}
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logger.debug("Connection successful.")
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} catch {
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logger.trace("Failed to connect: \(error)")
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}
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}
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private nonisolated func shutdown() {
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logger.debug("Begin shutting down MQTT broker connection.")
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client.removeCloseListener(named: name)
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internalEventStream.stop()
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_ = client.disconnect()
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try? client.syncShutdownGracefully()
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logger.info("MQTT broker connection closed.")
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}
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}
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extension MQTTConnectionService {
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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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private actor ConnectionStream: Sendable {
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private let continuation: AsyncStream<MQTTConnectionService.Event>.Continuation
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let events: AsyncStream<MQTTConnectionService.Event>
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init() {
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let (stream, continuation) = AsyncStream.makeStream(of: MQTTConnectionService.Event.self)
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self.events = stream
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self.continuation = continuation
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}
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deinit {
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stop()
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}
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func start(isActive connectionIsActive: @escaping () -> Bool) async {
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try? await Task.sleep(for: .seconds(1))
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let event: MQTTConnectionService.Event = connectionIsActive()
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? .connected
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: .disconnected
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continuation.yield(event)
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}
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nonisolated func stop() {
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continuation.yield(.shuttingDown)
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continuation.finish()
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}
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}
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}
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