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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 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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 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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"]}
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