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let window: any;\nconst _global = typeof global !== 'undefined' ? global : (typeof window !== 'undefined' ? window : {});\nconst NativeWebSocket = _global.WebSocket || _global.MozWebSocket;\n\nimport * as Backoff from 'backo2';\nimport { default as EventEmitterType, EventEmitter, ListenerFn } from 'eventemitter3';\nimport isString from './utils/is-string';\nimport isObject from './utils/is-object';\nimport { ExecutionResult } from 'graphql/execution/execute';\nimport { print } from 'graphql/language/printer';\nimport { DocumentNode } from 'graphql/language/ast';\nimport { getOperationAST } from 'graphql/utilities/getOperationAST';\nimport $$observable from 'symbol-observable';\n\nimport { GRAPHQL_WS } from './protocol';\nimport { MIN_WS_TIMEOUT, WS_TIMEOUT } from './defaults';\nimport MessageTypes from './message-types';\n\nexport interface Observer<T> {\n  next?: (value: T) => void;\n  error?: (error: Error) => void;\n  complete?: () => void;\n}\n\nexport interface Observable<T> {\n  subscribe(observer: Observer<T>): {\n    unsubscribe: () => void;\n  };\n}\n\nexport interface OperationOptions {\n  query?: string | DocumentNode;\n  variables?: Object;\n  operationName?: string;\n  [key: string]: any;\n}\n\nexport type FormatedError = Error & {\n  originalError?: any;\n};\n\nexport interface Operation {\n  options: OperationOptions;\n  handler: (error: Error[], result?: any) => void;\n}\n\nexport interface Operations {\n  [id: string]: Operation;\n}\n\nexport interface Middleware {\n  applyMiddleware(options: OperationOptions, next: Function): void;\n}\n\nexport type ConnectionParams = {\n  [paramName: string]: any,\n};\n\nexport type ConnectionParamsOptions = ConnectionParams | Function | Promise<ConnectionParams>;\n\nexport interface ClientOptions {\n  connectionParams?: ConnectionParamsOptions;\n  minTimeout?: number;\n  timeout?: number;\n  reconnect?: boolean;\n  reconnectionAttempts?: number;\n  connectionCallback?: (error: Error[], result?: any) => void;\n  lazy?: boolean;\n  inactivityTimeout?: number;\n  wsOptionArguments?: any[];\n}\n\nexport class SubscriptionClient {\n  public client: any;\n  public operations: Operations;\n  private url: string;\n  private nextOperationId: number;\n  private connectionParams: Function;\n  private minWsTimeout: number;\n  private wsTimeout: number;\n  private unsentMessagesQueue: Array<any>; // queued messages while websocket is opening.\n  private reconnect: boolean;\n  private reconnecting: boolean;\n  private reconnectionAttempts: number;\n  private backoff: any;\n  private connectionCallback: any;\n  private eventEmitter: EventEmitterType;\n  private lazy: boolean;\n  private inactivityTimeout: number;\n  private inactivityTimeoutId: any;\n  private closedByUser: boolean;\n  private wsImpl: any;\n  private wsProtocols: string | string[];\n  private wasKeepAliveReceived: boolean;\n  private tryReconnectTimeoutId: any;\n  private checkConnectionIntervalId: any;\n  private maxConnectTimeoutId: any;\n  private middlewares: Middleware[];\n  private maxConnectTimeGenerator: any;\n  private wsOptionArguments: any[];\n\n  constructor(\n    url: string,\n    options?: ClientOptions,\n    webSocketImpl?: any,\n    webSocketProtocols?: string | string[],\n  ) {\n    const {\n      connectionCallback = undefined,\n      connectionParams = {},\n      minTimeout = MIN_WS_TIMEOUT,\n      timeout = WS_TIMEOUT,\n      reconnect = false,\n      reconnectionAttempts = Infinity,\n      lazy = false,\n      inactivityTimeout = 0,\n      wsOptionArguments = [],\n    } = (options || {});\n\n    this.wsImpl = webSocketImpl || NativeWebSocket;\n    if (!this.wsImpl) {\n      throw new Error('Unable to find native implementation, or alternative implementation for WebSocket!');\n    }\n\n    this.wsProtocols = webSocketProtocols || GRAPHQL_WS;\n    this.connectionCallback = connectionCallback;\n    this.url = url;\n    this.operations = {};\n    this.nextOperationId = 0;\n    this.minWsTimeout = minTimeout;\n    this.wsTimeout = timeout;\n    this.unsentMessagesQueue = [];\n    this.reconnect = reconnect;\n    this.reconnecting = false;\n    this.reconnectionAttempts = reconnectionAttempts;\n    this.lazy = !!lazy;\n    this.inactivityTimeout = inactivityTimeout;\n    this.closedByUser = false;\n    this.backoff = new Backoff({ jitter: 0.5 });\n    this.eventEmitter = new EventEmitter();\n    this.middlewares = [];\n    this.client = null;\n    this.maxConnectTimeGenerator = this.createMaxConnectTimeGenerator();\n    this.connectionParams = this.getConnectionParams(connectionParams);\n    this.wsOptionArguments = wsOptionArguments;\n\n    if (!this.lazy) {\n      this.connect();\n    }\n  }\n\n  public get status() {\n    if (this.client === null) {\n      return this.wsImpl.CLOSED;\n    }\n\n    return this.client.readyState;\n  }\n\n  public close(isForced = true, closedByUser = true) {\n    this.clearInactivityTimeout();\n    if (this.client !== null) {\n      this.closedByUser = closedByUser;\n\n      if (isForced) {\n        this.clearCheckConnectionInterval();\n        this.clearMaxConnectTimeout();\n        this.clearTryReconnectTimeout();\n        this.unsubscribeAll();\n        this.sendMessage(undefined, MessageTypes.GQL_CONNECTION_TERMINATE, null);\n      }\n\n      this.client.close();\n      this.client.onopen = null;\n      this.client.onclose = null;\n      this.client.onerror = null;\n      this.client.onmessage = null;\n      this.client = null;\n      this.eventEmitter.emit('disconnected');\n\n      if (!isForced) {\n        this.tryReconnect();\n      }\n    }\n  }\n\n  public request(request: OperationOptions): Observable<ExecutionResult> {\n    const getObserver = this.getObserver.bind(this);\n    const executeOperation = this.executeOperation.bind(this);\n    const unsubscribe = this.unsubscribe.bind(this);\n\n    let opId: string;\n\n    this.clearInactivityTimeout();\n\n    return {\n      [$$observable]() {\n        return this;\n      },\n      subscribe(\n        observerOrNext: ((Observer<ExecutionResult>) | ((v: ExecutionResult) => void)),\n        onError?: (error: Error) => void,\n        onComplete?: () => void,\n      ) {\n        const observer = getObserver(observerOrNext, onError, onComplete);\n\n        opId = executeOperation(request, (error: Error[], result: any) => {\n          if ( error === null && result === null ) {\n            if ( observer.complete ) {\n              observer.complete();\n            }\n          } else if (error) {\n            if ( observer.error ) {\n              observer.error(error[0]);\n            }\n          } else {\n            if ( observer.next ) {\n              observer.next(result);\n            }\n          }\n        });\n\n        return {\n          unsubscribe: () => {\n            if ( opId ) {\n              unsubscribe(opId);\n              opId = null;\n            }\n          },\n        };\n      },\n    };\n  }\n\n  public on(eventName: string, callback: ListenerFn, context?: any): Function {\n    const handler = this.eventEmitter.on(eventName, callback, context);\n\n    return () => {\n      handler.off(eventName, callback, context);\n    };\n  }\n\n  public onConnected(callback: ListenerFn, context?: any): Function {\n    return this.on('connected', callback, context);\n  }\n\n  public onConnecting(callback: ListenerFn, context?: any): Function {\n    return this.on('connecting', callback, context);\n  }\n\n  public onDisconnected(callback: ListenerFn, context?: any): Function {\n    return this.on('disconnected', callback, context);\n  }\n\n  public onReconnected(callback: ListenerFn, context?: any): Function {\n    return this.on('reconnected', callback, context);\n  }\n\n  public onReconnecting(callback: ListenerFn, context?: any): Function {\n    return this.on('reconnecting', callback, context);\n  }\n\n  public onError(callback: ListenerFn, context?: any): Function {\n    return this.on('error', callback, context);\n  }\n\n  public unsubscribeAll() {\n    Object.keys(this.operations).forEach( subId => {\n      this.unsubscribe(subId);\n    });\n  }\n\n  public applyMiddlewares(options: OperationOptions): Promise<OperationOptions> {\n    return new Promise((resolve, reject) => {\n      const queue = (funcs: Middleware[], scope: any) => {\n        const next = (error?: any) => {\n          if (error) {\n            reject(error);\n          } else {\n            if (funcs.length > 0) {\n              const f = funcs.shift();\n              if (f) {\n                f.applyMiddleware.apply(scope, [options, next]);\n              }\n            } else {\n              resolve(options);\n            }\n          }\n        };\n        next();\n      };\n\n      queue([...this.middlewares], this);\n    });\n  }\n\n  public use(middlewares: Middleware[]): SubscriptionClient {\n    middlewares.map((middleware) => {\n      if (typeof middleware.applyMiddleware === 'function') {\n        this.middlewares.push(middleware);\n      } else {\n        throw new Error('Middleware must implement the applyMiddleware function.');\n      }\n    });\n\n    return this;\n  }\n\n  private getConnectionParams(connectionParams: ConnectionParamsOptions): Function {\n    return (): Promise<ConnectionParams> => new Promise((resolve, reject) => {\n      if (typeof connectionParams === 'function') {\n        try {\n          return resolve(connectionParams.call(null));\n        } catch (error) {\n          return reject(error);\n        }\n      }\n\n      resolve(connectionParams);\n    });\n  }\n\n  private executeOperation(options: OperationOptions, handler: (error: Error[], result?: any) => void): string {\n    if (this.client === null) {\n      this.connect();\n    }\n\n    const opId = this.generateOperationId();\n    this.operations[opId] = { options: options, handler };\n\n    this.applyMiddlewares(options)\n      .then(processedOptions => {\n        this.checkOperationOptions(processedOptions, handler);\n        if (this.operations[opId]) {\n          this.operations[opId] = { options: processedOptions, handler };\n          this.sendMessage(opId, MessageTypes.GQL_START, processedOptions);\n        }\n      })\n      .catch(error => {\n        this.unsubscribe(opId);\n        handler(this.formatErrors(error));\n      });\n\n    return opId;\n  }\n\n  private getObserver<T>(\n    observerOrNext: ((Observer<T>) | ((v: T) => void)),\n    error?: (e: Error) => void,\n    complete?: () => void,\n  ) {\n    if ( typeof observerOrNext === 'function' ) {\n      return {\n        next: (v: T) => observerOrNext(v),\n        error: (e: Error) => error && error(e),\n        complete: () => complete && complete(),\n      };\n    }\n\n    return observerOrNext;\n  }\n\n  private createMaxConnectTimeGenerator() {\n    const minValue = this.minWsTimeout;\n    const maxValue = this.wsTimeout;\n\n    return new Backoff({\n      min: minValue,\n      max: maxValue,\n      factor: 1.2,\n    });\n  }\n\n  private clearCheckConnectionInterval() {\n    if (this.checkConnectionIntervalId) {\n      clearInterval(this.checkConnectionIntervalId);\n      this.checkConnectionIntervalId = null;\n    }\n  }\n\n  private clearMaxConnectTimeout() {\n    if (this.maxConnectTimeoutId) {\n      clearTimeout(this.maxConnectTimeoutId);\n      this.maxConnectTimeoutId = null;\n    }\n    }\n\n  private clearTryReconnectTimeout() {\n    if (this.tryReconnectTimeoutId) {\n      clearTimeout(this.tryReconnectTimeoutId);\n      this.tryReconnectTimeoutId = null;\n    }\n  }\n\n  private clearInactivityTimeout() {\n    if (this.inactivityTimeoutId) {\n      clearTimeout(this.inactivityTimeoutId);\n      this.inactivityTimeoutId = null;\n    }\n  }\n\n  private setInactivityTimeout() {\n    if (this.inactivityTimeout > 0 && Object.keys(this.operations).length === 0) {\n      this.inactivityTimeoutId = setTimeout(() => {\n        if (Object.keys(this.operations).length === 0) {\n          this.close();\n        }\n      }, this.inactivityTimeout);\n    }\n  }\n\n  private checkOperationOptions(options: OperationOptions, handler: (error: Error[], result?: any) => void) {\n    const { query, variables, operationName } = options;\n\n    if (!query) {\n      throw new Error('Must provide a query.');\n    }\n\n    if (!handler) {\n      throw new Error('Must provide an handler.');\n    }\n\n    if (\n      ( !isString(query) && !getOperationAST(query, operationName)) ||\n      ( operationName && !isString(operationName)) ||\n      ( variables && !isObject(variables))\n    ) {\n      throw new Error('Incorrect option types. query must be a string or a document,' +\n        '`operationName` must be a string, and `variables` must be an object.');\n    }\n  }\n\n  private buildMessage(id: string, type: string, payload: any) {\n    const payloadToReturn = payload && payload.query ?\n      {\n        ...payload,\n        query: typeof payload.query === 'string' ? payload.query : print(payload.query),\n      } :\n      payload;\n\n    return {\n      id,\n      type,\n      payload: payloadToReturn,\n    };\n  }\n\n  // ensure we have an array of errors\n  private formatErrors(errors: any): FormatedError[] {\n    if (Array.isArray(errors)) {\n      return errors;\n    }\n\n    // TODO  we should not pass ValidationError to callback in the future.\n    // ValidationError\n    if (errors && errors.errors) {\n      return this.formatErrors(errors.errors);\n    }\n\n    if (errors && errors.message) {\n      return [errors];\n    }\n\n    return [{\n      name: 'FormatedError',\n      message: 'Unknown error',\n      originalError: errors,\n    }];\n  }\n\n  private sendMessage(id: string, type: string, payload: any) {\n    this.sendMessageRaw(this.buildMessage(id, type, payload));\n  }\n\n  // send message, or queue it if connection is not open\n  private sendMessageRaw(message: Object) {\n    switch (this.status) {\n      case this.wsImpl.OPEN:\n        let serializedMessage: string = JSON.stringify(message);\n        try {\n          JSON.parse(serializedMessage);\n        } catch (e) {\n          this.eventEmitter.emit('error', new Error(`Message must be JSON-serializable. Got: ${message}`));\n        }\n\n        this.client.send(serializedMessage);\n        break;\n      case this.wsImpl.CONNECTING:\n        this.unsentMessagesQueue.push(message);\n\n        break;\n      default:\n        if (!this.reconnecting) {\n          this.eventEmitter.emit('error', new Error('A message was not sent because socket is not connected, is closing or ' +\n            'is already closed. Message was: ' + JSON.stringify(message)));\n        }\n    }\n  }\n\n  private generateOperationId(): string {\n    return String(++this.nextOperationId);\n  }\n\n  private tryReconnect() {\n    if (!this.reconnect || this.backoff.attempts >= this.reconnectionAttempts) {\n      return;\n    }\n\n    if (!this.reconnecting) {\n      Object.keys(this.operations).forEach((key) => {\n        this.unsentMessagesQueue.push(\n          this.buildMessage(key, MessageTypes.GQL_START, this.operations[key].options),\n        );\n      });\n      this.reconnecting = true;\n    }\n\n    this.clearTryReconnectTimeout();\n\n    const delay = this.backoff.duration();\n    this.tryReconnectTimeoutId = setTimeout(() => {\n      this.connect();\n    }, delay);\n  }\n\n  private flushUnsentMessagesQueue() {\n    this.unsentMessagesQueue.forEach((message) => {\n      this.sendMessageRaw(message);\n    });\n    this.unsentMessagesQueue = [];\n  }\n\n  private checkConnection() {\n    if (this.wasKeepAliveReceived) {\n      this.wasKeepAliveReceived = false;\n      return;\n    }\n\n    if (!this.reconnecting) {\n      this.close(false, true);\n    }\n  }\n\n  private checkMaxConnectTimeout() {\n    this.clearMaxConnectTimeout();\n\n    // Max timeout trying to connect\n    this.maxConnectTimeoutId = setTimeout(() => {\n      if (this.status !== this.wsImpl.OPEN) {\n        this.reconnecting = true;\n        this.close(false, true);\n      }\n    }, this.maxConnectTimeGenerator.duration());\n  }\n\n  private connect() {\n    this.client = new this.wsImpl(this.url, this.wsProtocols, ...this.wsOptionArguments);\n\n    this.checkMaxConnectTimeout();\n\n    this.client.onopen = async () => {\n      if (this.status === this.wsImpl.OPEN) {\n        this.clearMaxConnectTimeout();\n        this.closedByUser = false;\n        this.eventEmitter.emit(this.reconnecting ? 'reconnecting' : 'connecting');\n\n        try {\n          const connectionParams: ConnectionParams = await this.connectionParams();\n\n          // Send CONNECTION_INIT message, no need to wait for connection to success (reduce roundtrips)\n          this.sendMessage(undefined, MessageTypes.GQL_CONNECTION_INIT, connectionParams);\n          this.flushUnsentMessagesQueue();\n        } catch (error) {\n          this.sendMessage(undefined, MessageTypes.GQL_CONNECTION_ERROR, error);\n          this.flushUnsentMessagesQueue();\n        }\n      }\n    };\n\n    this.client.onclose = () => {\n      if (!this.closedByUser) {\n        this.close(false, false);\n      }\n    };\n\n    this.client.onerror = (err: Error) => {\n      // Capture and ignore errors to prevent unhandled exceptions, wait for\n      // onclose to fire before attempting a reconnect.\n      this.eventEmitter.emit('error', err);\n    };\n\n    this.client.onmessage = ({ data }: {data: any}) => {\n      this.processReceivedData(data);\n    };\n  }\n\n  private processReceivedData(receivedData: any) {\n    let parsedMessage: any;\n    let opId: string;\n\n    try {\n      parsedMessage = JSON.parse(receivedData);\n      opId = parsedMessage.id;\n    } catch (e) {\n      throw new Error(`Message must be JSON-parseable. Got: ${receivedData}`);\n    }\n\n    if (\n      [ MessageTypes.GQL_DATA,\n        MessageTypes.GQL_COMPLETE,\n        MessageTypes.GQL_ERROR,\n      ].indexOf(parsedMessage.type) !== -1 && !this.operations[opId]\n    ) {\n      this.unsubscribe(opId);\n\n      return;\n    }\n\n    switch (parsedMessage.type) {\n      case MessageTypes.GQL_CONNECTION_ERROR:\n        if (this.connectionCallback) {\n          this.connectionCallback(parsedMessage.payload);\n        }\n        break;\n\n      case MessageTypes.GQL_CONNECTION_ACK:\n        this.eventEmitter.emit(this.reconnecting ? 'reconnected' : 'connected', parsedMessage.payload);\n        this.reconnecting = false;\n        this.backoff.reset();\n        this.maxConnectTimeGenerator.reset();\n\n        if (this.connectionCallback) {\n          this.connectionCallback();\n        }\n        break;\n\n      case MessageTypes.GQL_COMPLETE:\n        const handler = this.operations[opId].handler;\n        delete this.operations[opId];\n        handler.call(this, null, null);\n        break;\n\n      case MessageTypes.GQL_ERROR:\n        this.operations[opId].handler(this.formatErrors(parsedMessage.payload), null);\n        delete this.operations[opId];\n        break;\n\n      case MessageTypes.GQL_DATA:\n        const parsedPayload = !parsedMessage.payload.errors ?\n          parsedMessage.payload : {...parsedMessage.payload, errors: this.formatErrors(parsedMessage.payload.errors)};\n        this.operations[opId].handler(null, parsedPayload);\n        break;\n\n      case MessageTypes.GQL_CONNECTION_KEEP_ALIVE:\n        const firstKA = typeof this.wasKeepAliveReceived === 'undefined';\n        this.wasKeepAliveReceived = true;\n\n        if (firstKA) {\n          this.checkConnection();\n        }\n\n        if (this.checkConnectionIntervalId) {\n          clearInterval(this.checkConnectionIntervalId);\n          this.checkConnection();\n        }\n        this.checkConnectionIntervalId = setInterval(this.checkConnection.bind(this), this.wsTimeout);\n        break;\n\n      default:\n        throw new Error('Invalid message type!');\n    }\n  }\n\n  private unsubscribe(opId: string) {\n    if (this.operations[opId]) {\n      delete this.operations[opId];\n      this.setInactivityTimeout();\n      this.sendMessage(opId, MessageTypes.GQL_STOP, undefined);\n    }\n  }\n}\n"]}