rpc-websockets
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JSON-RPC 2.0 implementation over WebSockets for Node.js
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* WebSocket implements a browser-side WebSocket specification.\n * @module Client\n */\n\n\"use strict\"\n\nimport { EventEmitter } from \"eventemitter3\"\n\nimport {\n BrowserWebSocketType,\n NodeWebSocketType,\n IWSClientAdditionalOptions,\n} from \"./client.types.js\"\n\nclass WebSocketBrowserImpl extends EventEmitter\n{\n socket: BrowserWebSocketType\n\n /** Instantiate a WebSocket class\n * @constructor\n * @param {String} address - url to a websocket server\n * @param {(Object)} options - websocket options\n * @param {(String|Array)} protocols - a list of protocols\n * @return {WebSocketBrowserImpl} - returns a WebSocket instance\n */\n constructor(address: string, options: {}, protocols?: string | string[])\n {\n super()\n\n this.socket = new window.WebSocket(address, protocols)\n\n this.socket.onopen = () => this.emit(\"open\")\n this.socket.onmessage = (event) => this.emit(\"message\", event.data)\n this.socket.onerror = (error) => this.emit(\"error\", error)\n this.socket.onclose = (event) =>\n {\n this.emit(\"close\", event.code, event.reason)\n }\n }\n\n /**\n * Sends data through a websocket connection\n * @method\n * @param {(String|Object)} data - data to be sent via websocket\n * @param {Object} optionsOrCallback - ws options\n * @param {Function} callback - a callback called once the data is sent\n * @return {Undefined}\n */\n send(\n data: Parameters<BrowserWebSocketType[\"send\"]>[0],\n optionsOrCallback: (\n error?: Error\n ) => void | Parameters<NodeWebSocketType[\"send\"]>[1],\n callback?: () => void\n )\n {\n const cb = callback || optionsOrCallback\n\n try\n {\n this.socket.send(data)\n cb()\n }\n catch (error)\n {\n cb(error)\n }\n }\n\n /**\n * Closes an underlying socket\n * @method\n * @param {Number} code - status code explaining why the connection is being closed\n * @param {String} reason - a description why the connection is closing\n * @return {Undefined}\n * @throws {Error}\n */\n close(code?: number, reason?: string)\n {\n this.socket.close(code, reason)\n }\n\n addEventListener<K extends keyof WebSocketEventMap>(\n type: K,\n listener: (ev: WebSocketEventMap[K]) => any,\n options?: boolean | AddEventListenerOptions\n ): void\n {\n this.socket.addEventListener(type, listener, options)\n }\n}\n\n/**\n * factory method for common WebSocket instance\n * @method\n * @param {String} address - url to a websocket server\n * @param {(Object)} options - websocket options\n * @return {Undefined}\n */\nexport function WebSocket(\n address: string,\n options: IWSClientAdditionalOptions\n)\n{\n return new WebSocketBrowserImpl(address, options)\n}\n","\"use strict\"\n\nexport interface DataPack<\n T,\n R extends string | ArrayBufferLike | Blob | ArrayBufferView\n> {\n encode(value: T): R;\n decode(value: R): T;\n}\n\nexport class DefaultDataPack implements DataPack<Object, string>\n{\n encode(value: Object): string\n {\n return JSON.stringify(value)\n }\n\n decode(value: string): Object\n {\n return JSON.parse(value)\n }\n}\n","/**\n * \"Client\" wraps \"ws\" or a browser-implemented \"WebSocket\" library\n * according to the environment providing JSON RPC 2.0 support on top.\n * @module Client\n */\n\n\"use strict\"\n\nimport NodeWebSocket from \"ws\"\nimport { EventEmitter } from \"eventemitter3\"\nimport {\n ICommonWebSocket,\n IWSClientAdditionalOptions,\n NodeWebSocketType,\n ICommonWebSocketFactory,\n} from \"./client/client.types.js\"\n\nimport { DataPack, DefaultDataPack } from \"./utils.js\"\n\ninterface IQueueElement {\n promise: [\n Parameters<ConstructorParameters<typeof Promise>[0]>[0],\n Parameters<ConstructorParameters<typeof Promise>[0]>[1]\n ];\n timeout?: ReturnType<typeof setTimeout>;\n}\n\nexport interface IQueue {\n [x: number | string]: IQueueElement;\n}\n\nexport interface IWSRequestParams {\n [x: string]: any;\n [x: number]: any;\n}\n\nexport class CommonClient extends EventEmitter\n{\n private address: string\n private rpc_id: number | string\n private queue: IQueue\n private options: IWSClientAdditionalOptions & NodeWebSocket.ClientOptions\n private autoconnect: boolean\n private ready: boolean\n private reconnect: boolean\n private reconnect_timer_id: NodeJS.Timeout\n private reconnect_interval: number\n private max_reconnects: number\n private rest_options: IWSClientAdditionalOptions &\n NodeWebSocket.ClientOptions\n private current_reconnects: number\n private generate_request_id: (\n method: string,\n params: object | Array<any>\n ) => number | string\n private socket: ICommonWebSocket\n private webSocketFactory: ICommonWebSocketFactory\n private dataPack: DataPack<object, string>\n\n /**\n * Instantiate a Client class.\n * @constructor\n * @param {webSocketFactory} webSocketFactory - factory method for WebSocket\n * @param {String} address - url to a websocket server\n * @param {Object} options - ws options object with reconnect parameters\n * @param {Function} generate_request_id - custom generation request Id\n * @param {DataPack} dataPack - data pack contains encoder and decoder\n * @return {CommonClient}\n */\n constructor(\n webSocketFactory: ICommonWebSocketFactory,\n address = \"ws://localhost:8080\",\n {\n autoconnect = true,\n reconnect = true,\n reconnect_interval = 1000,\n max_reconnects = 5,\n ...rest_options\n } = {},\n generate_request_id?: (\n method: string,\n params: object | Array<any>\n ) => number | string,\n dataPack?: DataPack<object, string>\n )\n {\n super()\n\n this.webSocketFactory = webSocketFactory\n\n this.queue = {}\n this.rpc_id = 0\n\n this.address = address\n this.autoconnect = autoconnect\n this.ready = false\n this.reconnect = reconnect\n this.reconnect_timer_id = undefined\n this.reconnect_interval = reconnect_interval\n this.max_reconnects = max_reconnects\n this.rest_options = rest_options\n this.current_reconnects = 0\n this.generate_request_id = generate_request_id || (() => typeof this.rpc_id === \"number\"\n ? ++this.rpc_id\n : Number(this.rpc_id) + 1)\n\n if (!dataPack) this.dataPack = new DefaultDataPack()\n else this.dataPack = dataPack\n\n if (this.autoconnect)\n this._connect(this.address, {\n autoconnect: this.autoconnect,\n reconnect: this.reconnect,\n reconnect_interval: this.reconnect_interval,\n max_reconnects: this.max_reconnects,\n ...this.rest_options,\n })\n }\n\n /**\n * Connects to a defined server if not connected already.\n * @method\n * @return {Undefined}\n */\n connect()\n {\n if (this.socket) return\n\n this._connect(this.address, {\n autoconnect: this.autoconnect,\n reconnect: this.reconnect,\n reconnect_interval: this.reconnect_interval,\n max_reconnects: this.max_reconnects,\n ...this.rest_options,\n })\n }\n\n /**\n * Calls a registered RPC method on server.\n * @method\n * @param {String} method - RPC method name\n * @param {Object|Array} params - optional method parameters\n * @param {Number} timeout - RPC reply timeout value\n * @param {Object} ws_opts - options passed to ws\n * @return {Promise}\n */\n call(\n method: string,\n params?: IWSRequestParams,\n timeout?: number,\n ws_opts?: Parameters<NodeWebSocketType[\"send\"]>[1]\n )\n {\n if (!ws_opts && \"object\" === typeof timeout)\n {\n ws_opts = timeout\n timeout = null\n }\n\n return new Promise((resolve, reject) =>\n {\n if (!this.ready) return reject(new Error(\"socket not ready\"))\n\n const rpc_id = this.generate_request_id(method, params)\n\n const message = {\n jsonrpc: \"2.0\",\n method: method,\n params: params || undefined,\n id: rpc_id,\n }\n\n this.socket.send(this.dataPack.encode(message), ws_opts, (error) =>\n {\n if (error) return reject(error)\n\n this.queue[rpc_id] = { promise: [resolve, reject] }\n\n if (timeout)\n {\n this.queue[rpc_id].timeout = setTimeout(() =>\n {\n delete this.queue[rpc_id]\n reject(new Error(\"reply timeout\"))\n }, timeout)\n }\n })\n })\n }\n\n /**\n * Logins with the other side of the connection.\n * @method\n * @param {Object} params - Login credentials object\n * @return {Promise}\n */\n async login(params: IWSRequestParams)\n {\n const resp = await this.call(\"rpc.login\", params)\n\n if (!resp) throw new Error(\"authentication failed\")\n\n return resp\n }\n\n /**\n * Fetches a list of client's methods registered on server.\n * @method\n * @return {Array}\n */\n async listMethods()\n {\n return await this.call(\"__listMethods\")\n }\n\n /**\n * Sends a JSON-RPC 2.0 notification to server.\n * @method\n * @param {String} method - RPC method name\n * @param {Object} params - optional method parameters\n * @return {Promise}\n */\n notify(method: string, params?: IWSRequestParams)\n {\n return new Promise<void>((resolve, reject) =>\n {\n if (!this.ready) return reject(new Error(\"socket not ready\"))\n\n const message = {\n jsonrpc: \"2.0\",\n method: method,\n params,\n }\n\n this.socket.send(this.dataPack.encode(message), (error) =>\n {\n if (error) return reject(error)\n\n resolve()\n })\n })\n }\n\n /**\n * Subscribes for a defined event.\n * @method\n * @param {String|Array} event - event name\n * @return {Undefined}\n * @throws {Error}\n */\n async subscribe(event: string | Array<string>)\n {\n if (typeof event === \"string\") event = [event]\n\n const result = await this.call(\"rpc.on\", event)\n\n if (typeof event === \"string\" && result[event] !== \"ok\")\n throw new Error(\n \"Failed subscribing to an event '\" + event + \"' with: \" + result[event]\n )\n\n return result\n }\n\n /**\n * Unsubscribes from a defined event.\n * @method\n * @param {String|Array} event - event name\n * @return {Undefined}\n * @throws {Error}\n */\n async unsubscribe(event: string | Array<string>)\n {\n if (typeof event === \"string\") event = [event]\n\n const result = await this.call(\"rpc.off\", event)\n\n if (typeof event === \"string\" && result[event] !== \"ok\")\n throw new Error(\"Failed unsubscribing from an event with: \" + result)\n\n return result\n }\n\n /**\n * Closes a WebSocket connection gracefully.\n * @method\n * @param {Number} code - socket close code\n * @param {String} data - optional data to be sent before closing\n * @return {Undefined}\n */\n close(code?: number, data?: string)\n {\n this.socket.close(code || 1000, data)\n }\n\n /**\n * Enable / disable automatic reconnection.\n * @method\n * @param {Boolean} reconnect - enable / disable reconnection\n * @return {Undefined}\n */\n setAutoReconnect(reconnect: boolean)\n {\n this.reconnect = reconnect\n }\n\n /**\n * Set the interval between reconnection attempts.\n * @method\n * @param {Number} interval - reconnection interval in milliseconds\n * @return {Undefined}\n */\n setReconnectInterval(interval: number)\n {\n this.reconnect_interval = interval\n }\n\n /**\n * Set the maximum number of reconnection attempts.\n * @method\n * @param {Number} max_reconnects - maximum reconnection attempts\n * @return {Undefined}\n */\n setMaxReconnects(max_reconnects: number)\n {\n this.max_reconnects = max_reconnects\n }\n\n /**\n * Connection/Message handler.\n * @method\n * @private\n * @param {String} address - WebSocket API address\n * @param {Object} options - ws options object\n * @return {Undefined}\n */\n private _connect(\n address: string,\n options: IWSClientAdditionalOptions & NodeWebSocket.ClientOptions\n )\n {\n clearTimeout(this.reconnect_timer_id)\n this.socket = this.webSocketFactory(address, options)\n\n this.socket.addEventListener(\"open\", () =>\n {\n this.ready = true\n this.emit(\"open\")\n this.current_reconnects = 0\n })\n\n this.socket.addEventListener(\"message\", ({ data: message }) =>\n {\n if (message instanceof ArrayBuffer)\n message = Buffer.from(message).toString()\n\n try\n {\n message = this.dataPack.decode(message)\n }\n catch (error)\n {\n return\n }\n\n // check if any listeners are attached and forward event\n if (message.notification && this.listeners(message.notification).length)\n {\n if (!Object.keys(message.params).length)\n return this.emit(message.notification)\n\n const args = [message.notification]\n\n if (message.params.constructor === Object) args.push(message.params)\n // using for-loop instead of unshift/spread because performance is better\n else\n for (let i = 0; i < message.params.length; i++)\n args.push(message.params[i])\n\n // run as microtask so that pending queue messages are resolved first\n // eslint-disable-next-line prefer-spread\n return Promise.resolve().then(() =>\n {\n // eslint-disable-next-line prefer-spread\n this.emit.apply(this, args)\n })\n }\n\n if (!this.queue[message.id])\n {\n // general JSON RPC 2.0 events\n if (message.method)\n {\n // run as microtask so that pending queue messages are resolved first\n return Promise.resolve().then(() =>\n {\n this.emit(message.method, message?.params)\n })\n }\n\n return\n }\n\n // reject early since server's response is invalid\n if (\"error\" in message === \"result\" in message)\n this.queue[message.id].promise[1](\n new Error(\n \"Server response malformed. Response must include either \\\"result\\\"\" +\n \" or \\\"error\\\", but not both.\"\n )\n )\n\n if (this.queue[message.id].timeout)\n clearTimeout(this.queue[message.id].timeout)\n\n if (message.error) this.queue[message.id].promise[1](message.error)\n else this.queue[message.id].promise[0](message.result)\n\n delete this.queue[message.id]\n })\n\n this.socket.addEventListener(\"error\", (error) => this.emit(\"error\", error))\n\n this.socket.addEventListener(\"close\", ({ code, reason }) =>\n {\n if (this.ready)\n // Delay close event until internal state is updated\n setTimeout(() => this.emit(\"close\", code, reason), 0)\n\n this.ready = false\n this.socket = undefined\n\n if (code === 1000) return\n\n this.current_reconnects++\n\n if (\n this.reconnect &&\n (this.max_reconnects > this.current_reconnects ||\n this.max_reconnects === 0)\n )\n this.reconnect_timer_id = setTimeout(\n () => this._connect(address, options),\n this.reconnect_interval\n )\n })\n }\n}\n","\"use strict\"\n\nimport { WebSocket } from \"./lib/client/websocket.browser.js\"\nimport { CommonClient } from \"./lib/client.js\"\nimport { IWSClientAdditionalOptions } from \"./lib/client/client.types.js\"\n\nexport class Client extends CommonClient\n{\n constructor(\n address = \"ws://localhost:8080\",\n {\n autoconnect = true,\n reconnect = true,\n reconnect_interval = 1000,\n max_reconnects = 5,\n }: IWSClientAdditionalOptions = {},\n generate_request_id?: (\n method: string,\n params: object | Array<any>\n ) => number | string\n )\n {\n super(\n WebSocket,\n address,\n {\n autoconnect,\n reconnect,\n reconnect_interval,\n max_reconnects,\n },\n generate_request_id\n )\n }\n}\n\nexport * from \"./lib/client.js\"\nexport * from \"./lib/client/websocket.browser.js\"\nexport * from \"./lib/client/client.types.js\"\nexport * from \"./lib/utils.js\"\n"]}