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Copyright (c) .NET Foundation. All rights reserved.\r\n// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.\r\n\r\nimport { HandshakeProtocol, HandshakeRequestMessage, HandshakeResponseMessage } from \"./HandshakeProtocol\";\r\nimport { IConnection } from \"./IConnection\";\r\nimport { CancelInvocationMessage, CompletionMessage, IHubProtocol, InvocationMessage, MessageType, StreamInvocationMessage, StreamItemMessage } from \"./IHubProtocol\";\r\nimport { ILogger, LogLevel } from \"./ILogger\";\r\nimport { IStreamResult } from \"./Stream\";\r\nimport { Arg, Subject } from \"./Utils\";\r\n\r\nconst DEFAULT_TIMEOUT_IN_MS: number = 30 * 1000;\r\n\r\n/** Represents a connection to a SignalR Hub. */\r\nexport class HubConnection {\r\n private readonly connection: IConnection;\r\n private readonly logger: ILogger;\r\n private protocol: IHubProtocol;\r\n private handshakeProtocol: HandshakeProtocol;\r\n private callbacks: { [invocationId: string]: (invocationEvent: StreamItemMessage | CompletionMessage, error?: Error) => void };\r\n private methods: { [name: string]: Array<(...args: any[]) => void> };\r\n private id: number;\r\n private closedCallbacks: Array<(error?: Error) => void>;\r\n private timeoutHandle?: any;\r\n private receivedHandshakeResponse: boolean;\r\n\r\n /** The server timeout in milliseconds.\r\n *\r\n * If this timeout elapses without receiving any messages from the server, the connection will be terminated with an error.\r\n * The default timeout value is 30,000 milliseconds (30 seconds).\r\n */\r\n public serverTimeoutInMilliseconds: number;\r\n\r\n /** @internal */\r\n // Using a public static factory method means we can have a private constructor and an _internal_\r\n // create method that can be used by HubConnectionBuilder. An \"internal\" constructor would just\r\n // be stripped away and the '.d.ts' file would have no constructor, which is interpreted as a\r\n // public parameter-less constructor.\r\n public static create(connection: IConnection, logger: ILogger, protocol: IHubProtocol): HubConnection {\r\n return new HubConnection(connection, logger, protocol);\r\n }\r\n\r\n private constructor(connection: IConnection, logger: ILogger, protocol: IHubProtocol) {\r\n Arg.isRequired(connection, \"connection\");\r\n Arg.isRequired(logger, \"logger\");\r\n Arg.isRequired(protocol, \"protocol\");\r\n\r\n this.serverTimeoutInMilliseconds = DEFAULT_TIMEOUT_IN_MS;\r\n\r\n this.logger = logger;\r\n this.protocol = protocol;\r\n this.connection = connection;\r\n this.handshakeProtocol = new HandshakeProtocol();\r\n\r\n this.connection.onreceive = (data: any) => this.processIncomingData(data);\r\n this.connection.onclose = (error?: Error) => this.connectionClosed(error);\r\n\r\n this.callbacks = {};\r\n this.methods = {};\r\n this.closedCallbacks = [];\r\n this.id = 0;\r\n }\r\n\r\n /** Starts the connection.\r\n *\r\n * @returns {Promise} A Promise that resolves when the connection has been successfully established, or rejects with an error.\r\n */\r\n public async start(): Promise {\r\n const handshakeRequest: HandshakeRequestMessage = {\r\n protocol: this.protocol.name,\r\n version: this.protocol.version,\r\n };\r\n\r\n this.logger.log(LogLevel.Debug, \"Starting HubConnection.\");\r\n\r\n this.receivedHandshakeResponse = false;\r\n\r\n await this.connection.start(this.protocol.transferFormat);\r\n\r\n this.logger.log(LogLevel.Debug, \"Sending handshake request.\");\r\n\r\n await this.connection.send(this.handshakeProtocol.writeHandshakeRequest(handshakeRequest));\r\n\r\n this.logger.log(LogLevel.Information, `Using HubProtocol '${this.protocol.name}'.`);\r\n\r\n // defensively cleanup timeout in case we receive a message from the server before we finish start\r\n this.cleanupTimeout();\r\n this.configureTimeout();\r\n }\r\n\r\n /** Stops the connection.\r\n *\r\n * @returns {Promise} A Promise that resolves when the connection has been successfully terminated, or rejects with an error.\r\n */\r\n public stop(): Promise {\r\n this.logger.log(LogLevel.Debug, \"Stopping HubConnection.\");\r\n\r\n this.cleanupTimeout();\r\n return this.connection.stop();\r\n }\r\n\r\n /** Invokes a streaming hub method on the server using the specified name and arguments.\r\n *\r\n * @typeparam T The type of the items returned by the server.\r\n * @param {string} methodName The name of the server method to invoke.\r\n * @param {any[]} args The arguments used to invoke the server method.\r\n * @returns {IStreamResult} An object that yields results from the server as they are received.\r\n */\r\n public stream(methodName: string, ...args: any[]): IStreamResult {\r\n const invocationDescriptor = this.createStreamInvocation(methodName, args);\r\n\r\n const subject = new Subject(() => {\r\n const cancelInvocation: CancelInvocationMessage = this.createCancelInvocation(invocationDescriptor.invocationId);\r\n const cancelMessage: any = this.protocol.writeMessage(cancelInvocation);\r\n\r\n delete this.callbacks[invocationDescriptor.invocationId];\r\n\r\n return this.connection.send(cancelMessage);\r\n });\r\n\r\n this.callbacks[invocationDescriptor.invocationId] = (invocationEvent: CompletionMessage | StreamItemMessage, error?: Error) => {\r\n if (error) {\r\n subject.error(error);\r\n return;\r\n }\r\n\r\n if (invocationEvent.type === MessageType.Completion) {\r\n if (invocationEvent.error) {\r\n subject.error(new Error(invocationEvent.error));\r\n } else {\r\n subject.complete();\r\n }\r\n } else {\r\n subject.next((invocationEvent.item) as T);\r\n }\r\n };\r\n\r\n const message = this.protocol.writeMessage(invocationDescriptor);\r\n\r\n this.connection.send(message)\r\n .catch((e) => {\r\n subject.error(e);\r\n delete this.callbacks[invocationDescriptor.invocationId];\r\n });\r\n\r\n return subject;\r\n }\r\n\r\n /** Invokes a hub method on the server using the specified name and arguments. Does not wait for a response from the receiver.\r\n *\r\n * The Promise returned by this method resolves when the client has sent the invocation to the server. The server may still\r\n * be processing the invocation.\r\n *\r\n * @param {string} methodName The name of the server method to invoke.\r\n * @param {any[]} args The arguments used to invoke the server method.\r\n * @returns {Promise} A Promise that resolves when the invocation has been successfully sent, or rejects with an error.\r\n */\r\n public send(methodName: string, ...args: any[]): Promise {\r\n const invocationDescriptor = this.createInvocation(methodName, args, true);\r\n\r\n const message = this.protocol.writeMessage(invocationDescriptor);\r\n\r\n return this.connection.send(message);\r\n }\r\n\r\n /** Invokes a hub method on the server using the specified name and arguments.\r\n *\r\n * The Promise returned by this method resolves when the server indicates it has finished invoking the method. When the promise\r\n * resolves, the server has finished invoking the method. If the server method returns a result, it is produced as the result of\r\n * resolving the Promise.\r\n *\r\n * @typeparam T The expected return type.\r\n * @param {string} methodName The name of the server method to invoke.\r\n * @param {any[]} args The arguments used to invoke the server method.\r\n * @returns {Promise} A Promise that resolves with the result of the server method (if any), or rejects with an error.\r\n */\r\n public invoke(methodName: string, ...args: any[]): Promise {\r\n const invocationDescriptor = this.createInvocation(methodName, args, false);\r\n\r\n const p = new Promise((resolve, reject) => {\r\n this.callbacks[invocationDescriptor.invocationId] = (invocationEvent: StreamItemMessage | CompletionMessage, error?: Error) => {\r\n if (error) {\r\n reject(error);\r\n return;\r\n }\r\n if (invocationEvent.type === MessageType.Completion) {\r\n const completionMessage = invocationEvent as CompletionMessage;\r\n if (completionMessage.error) {\r\n reject(new Error(completionMessage.error));\r\n } else {\r\n resolve(completionMessage.result);\r\n }\r\n } else {\r\n reject(new Error(`Unexpected message type: ${invocationEvent.type}`));\r\n }\r\n };\r\n\r\n const message = this.protocol.writeMessage(invocationDescriptor);\r\n\r\n this.connection.send(message)\r\n .catch((e) => {\r\n reject(e);\r\n delete this.callbacks[invocationDescriptor.invocationId];\r\n });\r\n });\r\n\r\n return p;\r\n }\r\n\r\n /** Registers a handler that will be invoked when the hub method with the specified method name is invoked.\r\n *\r\n * @param {string} methodName The name of the hub method to define.\r\n * @param {Function} newMethod The handler that will be raised when the hub method is invoked.\r\n */\r\n public on(methodName: string, newMethod: (...args: any[]) => void) {\r\n if (!methodName || !newMethod) {\r\n return;\r\n }\r\n\r\n methodName = methodName.toLowerCase();\r\n if (!this.methods[methodName]) {\r\n this.methods[methodName] = [];\r\n }\r\n\r\n // Preventing adding the same handler multiple times.\r\n if (this.methods[methodName].indexOf(newMethod) !== -1) {\r\n return;\r\n }\r\n\r\n this.methods[methodName].push(newMethod);\r\n }\r\n\r\n /** Removes all handlers for the specified hub method.\r\n *\r\n * @param {string} methodName The name of the method to remove handlers for.\r\n */\r\n public off(methodName: string): void;\r\n\r\n /** Removes the specified handler for the specified hub method.\r\n *\r\n * You must pass the exact same Function instance as was previously passed to {@link @aspnet/signalr.HubConnection.on}. Passing a different instance (even if the function\r\n * body is the same) will not remove the handler.\r\n *\r\n * @param {string} methodName The name of the method to remove handlers for.\r\n * @param {Function} method The handler to remove. This must be the same Function instance as the one passed to {@link @aspnet/signalr.HubConnection.on}.\r\n */\r\n public off(methodName: string, method: (...args: any[]) => void): void;\r\n public off(methodName: string, method?: (...args: any[]) => void): void {\r\n if (!methodName) {\r\n return;\r\n }\r\n\r\n methodName = methodName.toLowerCase();\r\n const handlers = this.methods[methodName];\r\n if (!handlers) {\r\n return;\r\n }\r\n if (method) {\r\n const removeIdx = handlers.indexOf(method);\r\n if (removeIdx !== -1) {\r\n handlers.splice(removeIdx, 1);\r\n if (handlers.length === 0) {\r\n delete this.methods[methodName];\r\n }\r\n }\r\n } else {\r\n delete this.methods[methodName];\r\n }\r\n\r\n }\r\n\r\n /** Registers a handler that will be invoked when the connection is closed.\r\n *\r\n * @param {Function} callback The handler that will be invoked when the connection is closed. Optionally receives a single argument containing the error that caused the connection to close (if any).\r\n */\r\n public onclose(callback: (error?: Error) => void) {\r\n if (callback) {\r\n this.closedCallbacks.push(callback);\r\n }\r\n }\r\n\r\n private processIncomingData(data: any) {\r\n this.cleanupTimeout();\r\n\r\n if (!this.receivedHandshakeResponse) {\r\n data = this.processHandshakeResponse(data);\r\n this.receivedHandshakeResponse = true;\r\n }\r\n\r\n // Data may have all been read when processing handshake response\r\n if (data) {\r\n // Parse the messages\r\n const messages = this.protocol.parseMessages(data, this.logger);\r\n\r\n for (const message of messages) {\r\n switch (message.type) {\r\n case MessageType.Invocation:\r\n this.invokeClientMethod(message);\r\n break;\r\n case MessageType.StreamItem:\r\n case MessageType.Completion:\r\n const callback = this.callbacks[message.invocationId];\r\n if (callback != null) {\r\n if (message.type === MessageType.Completion) {\r\n delete this.callbacks[message.invocationId];\r\n }\r\n callback(message);\r\n }\r\n break;\r\n case MessageType.Ping:\r\n // Don't care about pings\r\n break;\r\n case MessageType.Close:\r\n this.logger.log(LogLevel.Information, \"Close message received from server.\");\r\n\r\n // We don't want to wait on the stop itself.\r\n // tslint:disable-next-line:no-floating-promises\r\n this.connection.stop(message.error ? new Error(\"Server returned an error on close: \" + message.error) : null);\r\n break;\r\n default:\r\n this.logger.log(LogLevel.Warning, \"Invalid message type: \" + message.type);\r\n break;\r\n }\r\n }\r\n }\r\n\r\n this.configureTimeout();\r\n }\r\n\r\n private processHandshakeResponse(data: any): any {\r\n let responseMessage: HandshakeResponseMessage;\r\n let remainingData: any;\r\n\r\n try {\r\n [remainingData, responseMessage] = this.handshakeProtocol.parseHandshakeResponse(data);\r\n } catch (e) {\r\n const message = \"Error parsing handshake response: \" + e;\r\n this.logger.log(LogLevel.Error, message);\r\n\r\n const error = new Error(message);\r\n\r\n // We don't want to wait on the stop itself.\r\n // tslint:disable-next-line:no-floating-promises\r\n this.connection.stop(error);\r\n throw error;\r\n }\r\n if (responseMessage.error) {\r\n const message = \"Server returned handshake error: \" + responseMessage.error;\r\n this.logger.log(LogLevel.Error, message);\r\n\r\n // We don't want to wait on the stop itself.\r\n // tslint:disable-next-line:no-floating-promises\r\n this.connection.stop(new Error(message));\r\n } else {\r\n this.logger.log(LogLevel.Debug, \"Server handshake complete.\");\r\n }\r\n\r\n return remainingData;\r\n }\r\n\r\n private configureTimeout() {\r\n if (!this.connection.features || !this.connection.features.inherentKeepAlive) {\r\n // Set the timeout timer\r\n this.timeoutHandle = setTimeout(() => this.serverTimeout(), this.serverTimeoutInMilliseconds);\r\n }\r\n }\r\n\r\n private serverTimeout() {\r\n // The server hasn't talked to us in a while. It doesn't like us anymore ... :(\r\n // Terminate the connection, but we don't need to wait on the promise.\r\n // tslint:disable-next-line:no-floating-promises\r\n this.connection.stop(new Error(\"Server timeout elapsed without receiving a message from the server.\"));\r\n }\r\n\r\n private invokeClientMethod(invocationMessage: InvocationMessage) {\r\n const methods = this.methods[invocationMessage.target.toLowerCase()];\r\n if (methods) {\r\n methods.forEach((m) => m.apply(this, invocationMessage.arguments));\r\n if (invocationMessage.invocationId) {\r\n // This is not supported in v1. So we return an error to avoid blocking the server waiting for the response.\r\n const message = \"Server requested a response, which is not supported in this version of the client.\";\r\n this.logger.log(LogLevel.Error, message);\r\n\r\n // We don't need to wait on this Promise.\r\n // tslint:disable-next-line:no-floating-promises\r\n this.connection.stop(new Error(message));\r\n }\r\n } else {\r\n this.logger.log(LogLevel.Warning, `No client method with the name '${invocationMessage.target}' found.`);\r\n }\r\n }\r\n\r\n private connectionClosed(error?: Error) {\r\n const callbacks = this.callbacks;\r\n this.callbacks = {};\r\n\r\n Object.keys(callbacks)\r\n .forEach((key) => {\r\n const callback = callbacks[key];\r\n callback(undefined, error ? error : new Error(\"Invocation canceled due to connection being closed.\"));\r\n });\r\n\r\n this.cleanupTimeout();\r\n\r\n this.closedCallbacks.forEach((c) => c.apply(this, [error]));\r\n }\r\n\r\n private cleanupTimeout(): void {\r\n if (this.timeoutHandle) {\r\n clearTimeout(this.timeoutHandle);\r\n }\r\n }\r\n\r\n private createInvocation(methodName: string, args: any[], nonblocking: boolean): InvocationMessage {\r\n if (nonblocking) {\r\n return {\r\n arguments: args,\r\n target: methodName,\r\n type: MessageType.Invocation,\r\n };\r\n } else {\r\n const id = this.id;\r\n this.id++;\r\n\r\n return {\r\n arguments: args,\r\n invocationId: id.toString(),\r\n target: methodName,\r\n type: MessageType.Invocation,\r\n };\r\n }\r\n }\r\n\r\n private createStreamInvocation(methodName: string, args: any[]): StreamInvocationMessage {\r\n const id = this.id;\r\n this.id++;\r\n\r\n return {\r\n arguments: args,\r\n invocationId: id.toString(),\r\n target: methodName,\r\n type: MessageType.StreamInvocation,\r\n };\r\n }\r\n\r\n private createCancelInvocation(id: string): CancelInvocationMessage {\r\n return {\r\n invocationId: id,\r\n type: MessageType.CancelInvocation,\r\n };\r\n }\r\n}\r\n"]}