@aws-amplify/pubsub/dist/esm/Providers/MqttOverWS.mjs.map

Pubsub category of aws-amplify

{"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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