@meddv/ngx-mqtt
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This library isn't just a wrapper around MQTT.js for angular. It uses observables and takes care of subscription handling and message routing.
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{"version":3,"file":"meddv-ngx-mqtt.mjs","sources":["../../../projects/ngx-mqtt/src/lib/mqtt.model.ts","../../../projects/ngx-mqtt/src/lib/mqtt.module.ts","../../../projects/ngx-mqtt/src/lib/mqtt.service.ts","../../../projects/ngx-mqtt/src/public-api.ts","../../../projects/ngx-mqtt/src/meddv-ngx-mqtt.ts"],"sourcesContent":["import { Stream } from 'stream';\r\nimport {MqttClient, IClientOptions, IClientPublishOptions, IStream, IConnackPacket} from 'mqtt';\r\nimport {IPacket} from \"mqtt-packet\";\r\n\r\nexport enum MqttConnectionState {\r\n CLOSED,\r\n CONNECTING,\r\n CONNECTED\r\n}\r\n\r\nexport interface IMqttServiceOptions extends IClientOptions {\r\n /**\r\n * whether a new connection should be created\r\n * on creating an instance of the service\r\n */\r\n connectOnCreate?: boolean;\r\n /** the hostname of the mqtt broker */\r\n hostname?: string;\r\n /** the port to connect with websocket to the broker */\r\n port?: number;\r\n /** the path parameters to connect to e.g. `/mqtt` */\r\n path?: string;\r\n protocol?: 'wss' | 'ws';\r\n /** if the url is provided, hostname, port path and protocol are ignored */\r\n url?: string;\r\n}\r\n\r\nexport interface IMqttMessage extends IPacket {\r\n /** the mqtt topic to which this message was published to */\r\n topic: string;\r\n /** the payload */\r\n payload: string | Buffer;\r\n /** the quality of service */\r\n qos: number;\r\n /** if this message is a retained message */\r\n retain: boolean;\r\n /** if this message is a duplicate */\r\n dup: boolean;\r\n}\r\n\r\nexport interface IPublishOptions extends IClientPublishOptions { }\r\nexport interface IOnConnectEvent extends IConnackPacket { }\r\nexport interface IOnErrorEvent extends Error {\r\n type?: string;\r\n}\r\nexport interface IOnMessageEvent extends IMqttMessage { }\r\nexport interface IOnSubackEvent {\r\n granted: boolean;\r\n filter: string;\r\n}\r\n\r\nexport interface IMqttClient extends MqttClient {\r\n stream: IStream;\r\n}\r\n\r\nexport interface IOnPacketsendEvent extends IPacket { }\r\nexport interface IOnPacketreceiveEvent extends IPacket { }\r\n","import {\r\n NgModule,\r\n ModuleWithProviders,\r\n InjectionToken\r\n} from '@angular/core';\r\nimport { IMqttClient, IMqttServiceOptions } from './mqtt.model';\r\n\r\nexport const MQTT_SERVICE_OPTIONS: IMqttServiceOptions = {\r\n connectOnCreate: true,\r\n hostname: 'localhost',\r\n port: 1884,\r\n path: ''\r\n};\r\n\r\nexport const MqttServiceConfig = new InjectionToken<IMqttServiceOptions>('NgxMqttServiceConfig');\r\nexport const MqttClientService = new InjectionToken<IMqttClient>('NgxMqttClientService');\r\n\r\n@NgModule()\r\nexport class MqttModule {\r\n static forRoot(config: IMqttServiceOptions, client?: IMqttClient): ModuleWithProviders<MqttModule> {\r\n return {\r\n ngModule: MqttModule,\r\n providers: [\r\n {\r\n provide: MqttServiceConfig,\r\n useValue: config\r\n },\r\n {\r\n provide: MqttClientService,\r\n useValue: client\r\n }\r\n ]\r\n };\r\n }\r\n}\r\n","import { EventEmitter, Inject, Injectable } from '@angular/core';\r\nimport { IClientPublishOptions, IClientSubscribeOptions, ISubscriptionGrant} from 'mqtt';\r\nimport { Packet } from 'mqtt-packet';\r\n\r\nimport mqtt from 'mqtt';\r\nconst connect = mqtt.connect;\r\ntype MqttClient = mqtt.MqttClient;\r\n\r\nimport { BehaviorSubject, merge, Observable, Observer, Subject, Subscription, Unsubscribable, using } from 'rxjs';\r\nimport { filter, publish, publishReplay, refCount } from 'rxjs/operators';\r\n\r\nimport {\r\n IMqttMessage,\r\n IMqttServiceOptions,\r\n IOnConnectEvent,\r\n IOnErrorEvent,\r\n IOnPacketreceiveEvent,\r\n IOnPacketsendEvent,\r\n IOnSubackEvent,\r\n IPublishOptions,\r\n MqttConnectionState\r\n} from './mqtt.model';\r\n\r\nimport { MqttClientService, MqttServiceConfig } from './mqtt.module';\r\n\r\n// A javascript function that takes two objects and merges them recursively\r\nfunction mergeDeep(target: any, ...sources: any[]): any {\r\n if (!sources.length) {\r\n return target;\r\n }\r\n const source = sources.shift();\r\n\r\n if (isObject(target) && isObject(source)) {\r\n for (const key in source) {\r\n if (isObject(source[key])) {\r\n if (!target[key]) {\r\n Object.assign(target, { [key]: {} });\r\n }\r\n mergeDeep(target[key], source[key]);\r\n } else {\r\n Object.assign(target, { [key]: source[key] });\r\n }\r\n }\r\n }\r\n\r\n return mergeDeep(target, ...sources);\r\n}\r\n\r\nfunction isObject(item: any): item is Object {\r\n return item && typeof item === 'object' && !Array.isArray(item);\r\n}\r\n\r\n/**\r\n * With an instance of MqttService, you can observe and subscribe to MQTT in multiple places, e.g. in different components,\r\n * to only subscribe to the broker once per MQTT filter.\r\n * It also handles proper unsubscription from the broker, if the last observable with a filter is closed.\r\n */\r\n@Injectable({\r\n providedIn: 'root',\r\n})\r\nexport class MqttService {\r\n private client!: MqttClient;\r\n\r\n /**\r\n * The constructor needs [connection options]{@link IMqttServiceOptions} regarding the broker and some\r\n * options to configure behavior of this service, like if the connection to the broker\r\n * should be established on creation of this service or not.\r\n */\r\n constructor(\r\n @Inject(MqttServiceConfig) private options: IMqttServiceOptions,\r\n @Inject(MqttClientService) client?: MqttClient\r\n ) {\r\n if (options.connectOnCreate !== false) {\r\n this.connect({}, client);\r\n }\r\n\r\n this.state.subscribe();\r\n }\r\n\r\n /**\r\n * gets the _clientId\r\n */\r\n public get clientId() {\r\n return this._clientId;\r\n }\r\n\r\n /** An EventEmitter to listen to connect messages */\r\n public get onConnect(): EventEmitter<IOnConnectEvent> {\r\n return this._onConnect;\r\n }\r\n\r\n /** An EventEmitter to listen to reconnect messages */\r\n public get onReconnect(): EventEmitter<void> {\r\n return this._onReconnect;\r\n }\r\n\r\n /** An EventEmitter to listen to close messages */\r\n public get onClose(): EventEmitter<void> {\r\n return this._onClose;\r\n }\r\n\r\n /** An EventEmitter to listen to offline events */\r\n public get onOffline(): EventEmitter<void> {\r\n return this._onOffline;\r\n }\r\n\r\n /** An EventEmitter to listen to error events */\r\n public get onError(): EventEmitter<IOnErrorEvent> {\r\n return this._onError;\r\n }\r\n\r\n /** An EventEmitter to listen to close messages */\r\n public get onEnd(): EventEmitter<void> {\r\n return this._onEnd;\r\n }\r\n\r\n /** An EventEmitter to listen to message events */\r\n public get onMessage(): EventEmitter<Packet> {\r\n return this._onMessage;\r\n }\r\n\r\n /** An EventEmitter to listen to packetsend messages */\r\n public get onPacketsend(): EventEmitter<IOnPacketsendEvent> {\r\n return this._onPacketsend;\r\n }\r\n\r\n /** An EventEmitter to listen to packetreceive messages */\r\n public get onPacketreceive(): EventEmitter<IOnPacketreceiveEvent> {\r\n return this._onPacketreceive;\r\n }\r\n\r\n /** An EventEmitter to listen to suback events */\r\n public get onSuback(): EventEmitter<IOnSubackEvent> {\r\n return this._onSuback;\r\n }\r\n\r\n /** An actual connection state **/\r\n public get connectionState(): MqttConnectionState {\r\n return this.state.value;\r\n }\r\n\r\n /** a map of all mqtt observables by filter */\r\n public observables: { [filterString: string]: Observable<IMqttMessage> } = {};\r\n /** the connection state */\r\n public state: BehaviorSubject<MqttConnectionState> = new BehaviorSubject<MqttConnectionState>(MqttConnectionState.CLOSED);\r\n /** an observable of the last mqtt message */\r\n public messages: Subject<IMqttMessage> = new Subject<IMqttMessage>();\r\n\r\n private _clientId = this._generateClientId();\r\n private _connectTimeout = 10000;\r\n private _reconnectPeriod = 10000;\r\n private _url!: string;\r\n\r\n private _onConnect: EventEmitter<IOnConnectEvent> = new EventEmitter<IOnConnectEvent>();\r\n private _onReconnect: EventEmitter<void> = new EventEmitter<void>();\r\n private _onClose: EventEmitter<void> = new EventEmitter<void>();\r\n private _onOffline: EventEmitter<void> = new EventEmitter<void>();\r\n private _onError: EventEmitter<IOnErrorEvent> = new EventEmitter<IOnErrorEvent>();\r\n private _onEnd: EventEmitter<void> = new EventEmitter<void>();\r\n private _onMessage: EventEmitter<Packet> = new EventEmitter<Packet>();\r\n private _onSuback: EventEmitter<IOnSubackEvent> = new EventEmitter<IOnSubackEvent>();\r\n private _onPacketsend: EventEmitter<IOnPacketsendEvent> = new EventEmitter<IOnPacketsendEvent>();\r\n private _onPacketreceive: EventEmitter<IOnPacketreceiveEvent> = new EventEmitter<IOnPacketreceiveEvent>();\r\n\r\n /**\r\n * This static method shall be used to determine whether a MQTT\r\n * topic matches a given filter. The matching rules are specified in the MQTT\r\n * standard documentation and in the library test suite.\r\n *\r\n * @param {string} filter A filter may contain wildcards like '#' and '+'.\r\n * @param {string} topic A topic may not contain wildcards.\r\n * @return {boolean} true on match and false otherwise.\r\n */\r\n public static filterMatchesTopic(filterString: string, topic: string): boolean {\r\n if (filterString[0] === '#' && topic[0] === '$') {\r\n return false;\r\n }\r\n // Preparation: split and reverse on '/'. The JavaScript split function is sane.\r\n const fs = (filterString || '').split('/').reverse();\r\n const ts = (topic || '').split('/').reverse();\r\n // This function is tail recursive and compares both arrays one element at a time.\r\n const match = (): boolean => {\r\n // Cutting of the last element of both the filter and the topic using pop().\r\n const f = fs.pop();\r\n const t = ts.pop();\r\n switch (f) {\r\n // In case the filter level is '#', this is a match no matter whether\r\n // the topic is undefined on this level or not ('#' matches parent element as well!).\r\n case '#':\r\n return true;\r\n // In case the filter level is '+', we shall dive into the recursion only if t is not undefined.\r\n case '+':\r\n return t ? match() : false;\r\n // In all other cases the filter level must match the topic level,\r\n // both must be defined and the filter tail must match the topic\r\n // tail (which is determined by the recursive call of match()).\r\n default:\r\n return f === t && (f === undefined ? true : match());\r\n }\r\n };\r\n return match();\r\n }\r\n\r\n /**\r\n * connect manually connects to the mqtt broker.\r\n */\r\n public connect(opts?: IMqttServiceOptions, client?: MqttClient) {\r\n const options = mergeDeep(this.options || {}, opts);\r\n const protocol = options.protocol || 'ws';\r\n const hostname = options.hostname || 'localhost';\r\n if (options.url) {\r\n this._url = options.url;\r\n } else {\r\n this._url = `${protocol}://${hostname}`;\r\n this._url += options.port ? `:${options.port}` : '';\r\n this._url += options.path ? `${options.path}` : '';\r\n }\r\n this.state.next(MqttConnectionState.CONNECTING);\r\n const mergedOptions = mergeDeep({\r\n clientId: this._clientId,\r\n reconnectPeriod: this._reconnectPeriod,\r\n connectTimeout: this._connectTimeout\r\n }, options);\r\n\r\n if (this.client) {\r\n this.client.end(true);\r\n }\r\n\r\n if (!client) {\r\n this.client = connect(this._url, mergedOptions);\r\n } else {\r\n this.client = client;\r\n }\r\n this._clientId = mergedOptions.clientId;\r\n\r\n this.client.on('connect', this._handleOnConnect);\r\n this.client.on('reconnect', this._handleOnReconnect);\r\n this.client.on('close', this._handleOnClose);\r\n this.client.on('offline', this._handleOnOffline);\r\n this.client.on('error', this._handleOnError);\r\n (this.client as any).stream.on('error', this._handleOnError);\r\n this.client.on('end', this._handleOnEnd);\r\n this.client.on('message', this._handleOnMessage);\r\n this.client.on('packetsend', this._handleOnPacketsend);\r\n this.client.on('packetreceive', this._handleOnPacketreceive);\r\n }\r\n\r\n /**\r\n * disconnect disconnects from the mqtt client.\r\n * This method `should` be executed when leaving the application.\r\n */\r\n public disconnect(force = true) {\r\n if (!this.client) {\r\n throw new Error('mqtt client not connected');\r\n }\r\n this.client.end(force);\r\n }\r\n\r\n /**\r\n * With this method, you can observe messages for a mqtt topic.\r\n * The observable will only emit messages matching the filter.\r\n * The first one subscribing to the resulting observable executes a mqtt subscribe.\r\n * The last one unsubscribing this filter executes a mqtt unsubscribe.\r\n * Every new subscriber gets the latest message.\r\n */\r\n public observeRetained(filterString: string, opts: IClientSubscribeOptions = { qos: 1 }): Observable<IMqttMessage> {\r\n return this._generalObserve(filterString, () => publishReplay(1), opts);\r\n }\r\n\r\n /**\r\n * With this method, you can observe messages for a mqtt topic.\r\n * The observable will only emit messages matching the filter.\r\n * The first one subscribing to the resulting observable executes a mqtt subscribe.\r\n * The last one unsubscribing this filter executes a mqtt unsubscribe.\r\n */\r\n public observe(filterString: string, opts: IClientSubscribeOptions = { qos: 1 }): Observable<IMqttMessage> {\r\n return this._generalObserve(filterString, () => publish(), opts);\r\n }\r\n\r\n /**\r\n * With this method, you can observe messages for a mqtt topic.\r\n * The observable will only emit messages matching the filter.\r\n * The first one subscribing to the resulting observable executes a mqtt subscribe.\r\n * The last one unsubscribing this filter executes a mqtt unsubscribe.\r\n * Depending on the publish function, the messages will either be replayed after new\r\n * subscribers subscribe or the messages are just passed through\r\n */\r\n private _generalObserve(filterString: string, publishFn: Function, opts: IClientSubscribeOptions): Observable<IMqttMessage> {\r\n if (!this.client) {\r\n throw new Error('mqtt client not connected');\r\n }\r\n if (!this.observables[filterString]) {\r\n const rejected: Subject<IMqttMessage> = new Subject();\r\n this.observables[filterString] = using(\r\n // resourceFactory: Do the actual ref-counting MQTT subscription.\r\n // refcount is decreased on unsubscribe.\r\n () => {\r\n const subscription: Subscription = new Subscription();\r\n this.client.subscribe(filterString, opts, (err: any, granted: ISubscriptionGrant[] | undefined) => {\r\n if (granted) { // granted can be undefined when an error occurs when the client is disconnecting\r\n granted.forEach((granted_: ISubscriptionGrant) => {\r\n if (granted_.qos === 128) {\r\n delete this.observables[granted_.topic];\r\n this.client.unsubscribe(granted_.topic);\r\n rejected.error(`subscription for '${granted_.topic}' rejected!`);\r\n }\r\n this._onSuback.emit({ filter: filterString, granted: granted_.qos !== 128 });\r\n });\r\n }\r\n });\r\n subscription.add(() => {\r\n delete this.observables[filterString];\r\n this.client.unsubscribe(filterString);\r\n });\r\n return subscription;\r\n },\r\n // observableFactory: Create the observable that is consumed from.\r\n // This part is not executed until the Observable returned by\r\n // `observe` gets actually subscribed.\r\n (subscription: Unsubscribable | void) => merge(rejected, this.messages))\r\n .pipe(\r\n filter((msg: IMqttMessage) => MqttService.filterMatchesTopic(filterString, msg.topic)),\r\n publishFn(),\r\n refCount()\r\n ) as Observable<IMqttMessage>;\r\n }\r\n return this.observables[filterString];\r\n }\r\n\r\n /**\r\n * This method returns an observable for a topic with optional options.\r\n * After subscribing, the actual mqtt publication will be executed and\r\n * the observable will emit an empty value and completes, if publishing was successful\r\n * or throws an error, if the publication fails.\r\n */\r\n public publish(topic: string, message: string | Buffer, options: IClientPublishOptions = {}): Observable<void> {\r\n if (!this.client) {\r\n throw new Error('mqtt client not connected');\r\n }\r\n return Observable.create((obs: Observer<void>) => {\r\n this.client.publish(topic, message, options, (error: Error | undefined) => {\r\n if (error) {\r\n obs.error(error);\r\n } else {\r\n obs.next();\r\n obs.complete();\r\n }\r\n });\r\n });\r\n }\r\n\r\n /**\r\n * This method publishes a message for a topic with optional options.\r\n * If an error occurs, it will throw.\r\n */\r\n public unsafePublish(topic: string, message: string | Buffer, options: IPublishOptions = {}): void {\r\n if (!this.client) {\r\n throw new Error('mqtt client not connected');\r\n }\r\n this.client.publish(topic, message, options, (error: Error | undefined) => {\r\n if (error) {\r\n throw (error);\r\n }\r\n });\r\n }\r\n\r\n private _handleOnConnect = (e: IOnConnectEvent) => {\r\n if (this.options.connectOnCreate === true) {\r\n Object.keys(this.observables).forEach((filterString: string) => {\r\n this.client.subscribe(filterString);\r\n });\r\n }\r\n this.state.next(MqttConnectionState.CONNECTED);\r\n this._onConnect.emit(e);\r\n }\r\n\r\n private _handleOnReconnect = () => {\r\n if (this.options.connectOnCreate === true) {\r\n Object.keys(this.observables).forEach((filterString: string) => {\r\n this.client.subscribe(filterString);\r\n });\r\n }\r\n this.state.next(MqttConnectionState.CONNECTING);\r\n this._onReconnect.emit();\r\n }\r\n\r\n private _handleOnClose = () => {\r\n this.state.next(MqttConnectionState.CLOSED);\r\n this._onClose.emit();\r\n }\r\n\r\n private _handleOnOffline = () => {\r\n this._onOffline.emit();\r\n }\r\n\r\n private _handleOnError = (e: IOnErrorEvent) => {\r\n this._onError.emit(e);\r\n console.error(e);\r\n }\r\n\r\n private _handleOnEnd = () => {\r\n this._onEnd.emit();\r\n }\r\n\r\n private _handleOnMessage = (topic: string, payload: Buffer, packet: Packet) => {\r\n this._onMessage.emit(packet);\r\n if (packet.cmd === 'publish') {\r\n this.messages.next(packet as any);\r\n }\r\n }\r\n\r\n private _handleOnPacketsend = (e: IOnPacketsendEvent) => {\r\n this._onPacketsend.emit(e);\r\n }\r\n\r\n private _handleOnPacketreceive = (e: IOnPacketreceiveEvent) => {\r\n this._onPacketreceive.emit(e);\r\n }\r\n\r\n private _generateClientId() {\r\n return 'client-' + Math.random().toString(36).substr(2, 19);\r\n }\r\n}\r\n","/*\r\n * Public API Surface of ngx-mqtt\r\n */\r\n\r\nexport * from './lib/mqtt.model';\r\nexport * from './lib/mqtt.service';\r\nexport * from './lib/mqtt.module';","/**\n * Generated bundle index. Do not edit.\n */\n\nexport * from 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