| 1 | {"version":3,"file":"MqttOverWS.mjs","sources":["../../../src/Providers/MqttOverWS.ts"],"sourcesContent":["// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.\n// SPDX-License-Identifier: Apache-2.0\nimport { Observable } from 'rxjs';\nimport { ConsoleLogger, Hub } from '@aws-amplify/core';\nimport { amplifyUuid } from '@aws-amplify/core/internals/utils';\nimport { ConnectionState, } from '../types/PubSub';\n// eslint-disable-next-line @typescript-eslint/ban-ts-comment\n// @ts-ignore this module is expected to not have declaration file\nimport * as Paho from '../vendor/paho-mqtt.js';\nimport { CONNECTION_CHANGE, ConnectionStateMonitor, } from '../utils/ConnectionStateMonitor';\nimport { ReconnectEvent, ReconnectionMonitor, } from '../utils/ReconnectionMonitor';\nimport { AbstractPubSub } from './PubSub';\nimport { AMPLIFY_SYMBOL, CONNECTION_STATE_CHANGE } from './constants';\nconst logger = new ConsoleLogger('MqttOverWS');\nexport function mqttTopicMatch(filter, topic) {\n const filterArray = filter.split('/');\n const { length } = filterArray;\n const topicArray = topic.split('/');\n for (let i = 0; i < length; ++i) {\n const left = filterArray[i];\n const right = topicArray[i];\n if (left === '#')\n return topicArray.length >= length;\n if (left !== '+' && left !== right)\n return false;\n }\n return length === topicArray.length;\n}\nclass ClientsQueue {\n constructor() {\n this.promises = new Map();\n }\n async get(clientId, clientFactory) {\n const cachedPromise = this.promises.get(clientId);\n if (cachedPromise)\n return cachedPromise;\n if (clientFactory) {\n const newPromise = clientFactory(clientId);\n this.promises.set(clientId, newPromise);\n newPromise.catch(() => this.promises.delete(clientId));\n return newPromise;\n }\n return undefined;\n }\n get allClients() {\n return Array.from(this.promises.keys());\n }\n remove(clientId) {\n this.promises.delete(clientId);\n }\n}\nconst dispatchPubSubEvent = (payload) => {\n Hub.dispatch('pubsub', payload, 'PubSub', AMPLIFY_SYMBOL);\n};\nconst topicSymbol = typeof Symbol !== 'undefined' ? Symbol('topic') : '@@topic';\nexport class MqttOverWS extends AbstractPubSub {\n constructor(options = {}) {\n super({ ...options, clientId: options.clientId || amplifyUuid() });\n this._clientsQueue = new ClientsQueue();\n this.connectionStateMonitor = new ConnectionStateMonitor();\n this.reconnectionMonitor = new ReconnectionMonitor();\n this._topicObservers = new Map();\n this._clientIdObservers = new Map();\n // Monitor the connection health state and pass changes along to Hub\n this.connectionStateMonitor.connectionStateObservable.subscribe(connectionStateChange => {\n dispatchPubSubEvent({\n event: CONNECTION_STATE_CHANGE,\n data: {\n provider: this,\n connectionState: connectionStateChange,\n },\n message: `Connection state is ${connectionStateChange}`,\n });\n this.connectionState = connectionStateChange;\n // Trigger reconnection when the connection is disrupted\n if (connectionStateChange === ConnectionState.ConnectionDisrupted) {\n this.reconnectionMonitor.record(ReconnectEvent.START_RECONNECT);\n }\n else if (connectionStateChange !== ConnectionState.Connecting) {\n // Trigger connected to halt reconnection attempts\n this.reconnectionMonitor.record(ReconnectEvent.HALT_RECONNECT);\n }\n });\n }\n get clientId() {\n return this.options.clientId;\n }\n get endpoint() {\n return Promise.resolve(this.options.endpoint);\n }\n get clientsQueue() {\n return this._clientsQueue;\n }\n get isSSLEnabled() {\n return !this.options\n .aws_appsync_dangerously_connect_to_http_endpoint_for_testing;\n }\n onDisconnect({ clientId, errorCode, ...args }) {\n if (errorCode !== 0) {\n logger.warn(clientId, JSON.stringify({ errorCode, ...args }, null, 2));\n if (!clientId) {\n return;\n }\n const clientIdObservers = this._clientIdObservers.get(clientId);\n if (!clientIdObservers) {\n return;\n }\n this.disconnect(clientId);\n }\n }\n async newClient({ url, clientId }) {\n logger.debug('Creating new MQTT client', clientId);\n this.connectionStateMonitor.record(CONNECTION_CHANGE.OPENING_CONNECTION);\n // eslint-disable-next-line @typescript-eslint/ban-ts-comment\n // @ts-ignore this module is expected to not have declaration file\n const client = new Paho.Client(url, clientId);\n client.onMessageArrived = ({ destinationName: topic, payloadString: msg, }) => {\n this._onMessage(topic, msg);\n };\n client.onConnectionLost = ({ errorCode, ...args }) => {\n this.onDisconnect({ clientId, errorCode, ...args });\n this.connectionStateMonitor.record(CONNECTION_CHANGE.CLOSED);\n };\n const connected = await new Promise((resolve, _reject) => {\n client.connect({\n useSSL: this.isSSLEnabled,\n mqttVersion: 3,\n onSuccess: () => {\n resolve(true);\n },\n onFailure: () => {\n if (clientId)\n this._clientsQueue.remove(clientId);\n this.connectionStateMonitor.record(CONNECTION_CHANGE.CLOSED);\n resolve(false);\n },\n });\n });\n if (connected) {\n this.connectionStateMonitor.record(CONNECTION_CHANGE.CONNECTION_ESTABLISHED);\n }\n return client;\n }\n async connect(clientId, options = {}) {\n return this.clientsQueue.get(clientId, async (inputClientId) => {\n const client = await this.newClient({\n ...options,\n clientId: inputClientId,\n });\n if (client) {\n // Once connected, subscribe to all topics registered observers\n this._topicObservers.forEach((_value, key) => {\n client.subscribe(key);\n });\n }\n return client;\n });\n }\n async disconnect(clientId) {\n const client = await this.clientsQueue.get(clientId);\n if (client && client.isConnected()) {\n client.disconnect();\n }\n this.clientsQueue.remove(clientId);\n this.connectionStateMonitor.record(CONNECTION_CHANGE.CLOSED);\n }\n async publish({ topics, message }) {\n const targetTopics = [].concat(topics);\n const msg = JSON.stringify(message);\n const client = await this.clientsQueue.get(this.clientId);\n if (client) {\n logger.debug('Publishing to topic(s)', targetTopics.join(','), message);\n targetTopics.forEach(topic => {\n client.send(topic, msg);\n });\n }\n else {\n logger.debug('Publishing to topic(s) failed', targetTopics.join(','), message);\n }\n }\n _onMessage(topic, msg) {\n try {\n const matchedTopicObservers = [];\n this._topicObservers.forEach((observerForTopic, observerTopic) => {\n if (mqttTopicMatch(observerTopic, topic)) {\n matchedTopicObservers.push(observerForTopic);\n }\n });\n const parsedMessage = JSON.parse(msg);\n if (typeof parsedMessage === 'object') {\n parsedMessage[topicSymbol] = topic;\n }\n matchedTopicObservers.forEach(observersForTopic => {\n observersForTopic.forEach(observer => {\n observer.next(parsedMessage);\n });\n });\n }\n catch (error) {\n logger.warn('Error handling message', error, msg);\n }\n }\n subscribe({ topics, options = {}, }) {\n const targetTopics = [].concat(topics);\n logger.debug('Subscribing to topic(s)', targetTopics.join(','));\n let reconnectSubscription;\n return new Observable(observer => {\n targetTopics.forEach(topic => {\n // this._topicObservers is used to notify the observers according to the topic received on the message\n let observersForTopic = this._topicObservers.get(topic);\n if (!observersForTopic) {\n observersForTopic = new Set();\n this._topicObservers.set(topic, observersForTopic);\n }\n observersForTopic.add(observer);\n });\n const { clientId = this.clientId } = options;\n // this._clientIdObservers is used to close observers when client gets disconnected\n let observersForClientId = this._clientIdObservers.get(clientId);\n if (!observersForClientId) {\n observersForClientId = new Set();\n }\n if (observersForClientId) {\n observersForClientId.add(observer);\n this._clientIdObservers.set(clientId, observersForClientId);\n }\n (async () => {\n const getClient = async () => {\n try {\n const { url = await this.endpoint } = options;\n const client = await this.connect(clientId, { url });\n if (client !== undefined) {\n targetTopics.forEach(topic => {\n client.subscribe(topic);\n });\n }\n }\n catch (e) {\n logger.debug('Error forming connection', e);\n }\n };\n // Establish the initial connection\n await getClient();\n // Add an observable to the reconnection list to manage reconnection for this subscription\n reconnectSubscription = new Observable(reconnectSubscriptionObserver => {\n this.reconnectionMonitor.addObserver(reconnectSubscriptionObserver);\n }).subscribe(() => {\n getClient();\n });\n })();\n return async () => {\n const client = await this.clientsQueue.get(clientId);\n reconnectSubscription?.unsubscribe();\n if (client) {\n this._clientIdObservers.get(clientId)?.delete(observer);\n // No more observers per client => client not needed anymore\n if (this._clientIdObservers.get(clientId)?.size === 0) {\n this.disconnect(clientId);\n this.connectionStateMonitor.record(CONNECTION_CHANGE.CLOSING_CONNECTION);\n this._clientIdObservers.delete(clientId);\n }\n targetTopics.forEach(topic => {\n const observersForTopic = this._topicObservers.get(topic) ||\n new Set();\n observersForTopic.delete(observer);\n // if no observers exists for the topic, topic should be removed\n if (observersForTopic.size === 0) {\n this._topicObservers.delete(topic);\n if (client.isConnected()) {\n client.unsubscribe(topic);\n }\n }\n });\n }\n return null;\n };\n });\n 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