slavery-js/dist/network/Connection.cjs.map

A simple clustering app that allows you to scale an application on multiple thread, containers or machines

{"version":3,"sources":["../../src/network/Connection.ts"],"sourcesContent":["import { io } from \"socket.io-client\";\nimport { Socket } from 'socket.io';\nimport log from '../utils/log.js';\nimport type Listener from './types/Listener.js';\n\nclass Connection {\n    /*\n     * this class is manager for the socket instance\n     * it takes either a socket or a host and port to create the socket\n     * if it takes the host and port it will consider that connection is a server\n     * if it takes a socket it will consider that connection is a client\n     *\n     * it manages conenction, the listeners and the available emitters */\n    private socket: Socket | any;\n    private request_id: number = 0;\n    // this node information\n    public name?: string;\n    public id?: string;\n    public listeners: Listener[] = [];\n    public type: 'client' | 'server';\n    public host?: string;\n    public port?: number;\n    // is connected or not\n    public isConnected: boolean;\n    // ot target of the socket\n    public socketId: string;\n    public targetType: 'client' | 'server';\n    public targetName?: string;\n    public targetId?: string;\n    public targetListeners: Listener[] = [];\n    public targetHost?: string;\n    public targetPort?: number;\n    // callbacks\n    private onConnectCallback: Function;\n    public onDisconnectCallback: Function;\n    public onSetListenersCallback: Function;\n\n    /*\n     * @param Node: Node\n     * @param socket: Socket\n     * @param host: string\n     * @param port: number\n     * @param id: string\n     * @param name: string\n     * */\n\n    constructor({ socket, host, port, id, name, listeners, timeout,\n                onConnect, onDisconnect, onSetListeners } : {\n        id?: string, socket?: Socket, host?: string,\n        port?: number, name?: string, listeners?: Listener[],\n        timeout?: number, onConnect?: Function, onDisconnect?: Function,\n        onSetListeners?: Function\n    }) {\n        // callbacks\n        this.onConnectCallback = onConnect || (() => {});\n        this.onDisconnectCallback = onDisconnect || (() => {});\n        this.onSetListenersCallback = onSetListeners || (() => {});\n        // set listeners\n        if(listeners) this.listeners = listeners;\n        // if get a socket to connect to the server\n        if (socket && name) {\n            this.type = 'server';\n            this.name = name;\n            this.targetType = 'client';\n            // the socket\n            this.socket = socket;\n            // get the id of client\n            this.targetId = socket.handshake.auth.id;\n            //log('[Connection][server] targetId: ', this.targetId)\n            // since we are already getting the socket\n            this.isConnected = true;\n            // if get a host and port to connect to the server\n        } else if (host && port && id) {\n            this.type = 'client';\n            this.targetType = 'server';\n            // use the id\n            this.id = id;\n            this.socket = io(`ws://${host}:${port}`, {\n                auth: { id },\n                timeout: timeout || 1000 * 60 // 1 minute\n            });\n            // since we are not connected yet\n            this.isConnected = false;\n        } else\n            throw new Error('Connection must have either a socket and a name or a host and port');\n        // set the socket id\n        this.socketId = this.socket.id;\n        // initialize the listeners\n        this.initilaizeListeners()\n    }\n\n    private initilaizeListeners(): void {\n        /* this function inizializes the default listeners for the socket */\n        // set the object listeners \n        this.listeners.forEach( l => {\n            this.socket.removeAllListeners(l.event);\n            this.socket.on(l.event, this.respond(l.event, async (parameters:any) => {\n                //log(`[${this.id}] [Connection][initilaizeListeners] got event: ${l.event} from ${this.targetName}: `, parameters)\n                return await l.callback(parameters);\n            }));\n        });\n        // if target is asking for connections\n        this.socket.on(\"_listeners\", this.respond(\"_listeners\", () => this.getListeners()));\n        // if the target is sending a their listeners\n        this.socket.on(\"_set_listeners\", this.respond(\"_set_listeners\", (listeners: string[]) => {\n            //log(`[${this.id}] [Connection][Node] got liteners from ${this.targetName}: `, listeners)\n            this.targetListeners =\n                listeners.map(event => ({ event, callback: () => {} }));\n            this.onSetListenersCallback(this.targetListeners);\n            return 'ok';\n        }));\n        // if target is asking for name\n        this.socket.on(\"_name\", this.respond(\"_name\", () => this.name));\n        // if target is asking for id\n        this.socket.on(\"_id\", () => this.id);\n        // on connected\n        this.socket.on(\"connect\", async () => {\n            //log(`[connection][${this.socket.id}] is connected, querying target name and listeners:`)\n            // ask for listeners\n            this.targetName = await this.queryTargetName();\n            this.targetListeners = await this.queryTargetListeners();\n            //log(`[connection][${this.socket.id}] target name: ${this.targetName}, target listeners: ${this.targetListeners}`)\n            this.isConnected = true;\n            this.onConnectCallback(this);\n        });\n        // if it disconnects\n        this.socket.on(\"reconnect\", async (attempt: number) => {\n            //log(`[connection][${this.socket.id}] is reconnected, attempt: ${attempt}`)\n            this.targetName = await this.queryTargetName();\n            this.targetListeners = await this.queryTargetListeners();\n            this.isConnected = true;\n            this.onConnectCallback(this);\n        });\n        // if it disconnects\n        this.socket.on(\"diconnect\", () => {\n            //log(`[connection][${this.socket.id}] is disconnected`)\n            this.isConnected = false;\n            this.onDisconnectCallback(this);\n        });\n    }\n\n    public async connected(): Promise<boolean> {\n        return new Promise((resolve, reject) => {\n            let interval: NodeJS.Timeout;\n            let timeout: NodeJS.Timeout\n            // set interval to check for connection\n            interval = setInterval(() => {\n                if(this.isConnected) {\n                    clearInterval(interval);\n                    clearTimeout(timeout);\n                    resolve(true);\n                }\n            }, 100); // 100 ms\n            // set timeout to reject if no connection\n            timeout = setTimeout(() => {\n                clearInterval(interval);\n                reject(false);\n            }, 1000 * 60 ); // 1 minute\n        })\n    }\n\n\n    public getType(){\n        return this.type;\n    }\n\n    public on(event: string, callback: Function): void {\n        this.socket.on(event, callback);\n    }\n\n    public emit(event: string, data: any): void {\n        this.socket.emit(event, data);\n    }\n\n    public getName(): string | undefined {\n        return this.name;\n    }\n\n    // this is the id of the conenction?\n    public getId(): string | undefined {\n        return this.id;\n    }\n\n    public getTargetName(): string | undefined {\n        return this.targetName;\n    }\n\n    // this is the id of the target client\n    public getTargetId(): string | undefined {\n        return this.targetId;\n    }\n\n    public async setListeners(listeners: Listener[]): Promise<void> {\n        // set the listeners on the socket\n        listeners.forEach( l => {\n            this.listeners.push(l);\n            // remove the listener if it exists\n            this.socket.removeAllListeners(l.event);\n            // add new listener\n            this.socket.on(l.event, this.respond(l.event, async (parameters:any) => {\n                // run the callback defined in the listner\n                return await l.callback(parameters);\n            }));    \n        });\n        // update the listeners on the target\n        if(this.type === 'server'){\n            //let response = \n            await this.query('_set_listeners', listeners.map(listener => listener.event));\n            //if(response === 'ok') log('[Connection]<setListeners> listeners set successfully')\n        }\n    }\n\n    public addListeners(listeners: Listener[]): void {\n        // make sure we are not adding the same listener\n        const eventMap = new Map(this.listeners.map(l => [l.event, l]));\n        // add the listeners\n        listeners.forEach( l => eventMap.set(l.event, l) );\n        // set the listeners in the connection\n        this.listeners = Array.from(eventMap.values());\n        // set the listeners on the socket\n        this.setListeners(this.listeners);\n    }\n\n    public getTargetListeners(): Listener[] {\n        return this.targetListeners;\n    }\n\n    public onSetListeners(callback: Function): void {\n        this.onSetListenersCallback = callback;\n    }\n\n    public onConnect(callback: Function): void {\n        this.onConnectCallback = callback;\n    }\n\n    public onDisconnect(callback: Function): void {\n        this.onDisconnectCallback = callback;\n    }\n\n    private queryTargetListeners(): Promise<Listener[]> {\n        // query the target listeners\n        return this.query('_listeners');\n    }\n\n    private queryTargetName(): Promise<string> {\n        // query the target name\n        return this.query('_name');\n    }\n\n    // this function need to be awaited\n    public query(event: string, data?: any): Promise<any> {\n        /* this function makes the query to the socket and waits for the response */\n        return new Promise((resolve, reject) => {\n            // set a time out\n            let timeout = setTimeout( () => { reject('timeout') }, 1000 * 60); // 1 minute\n            // get request id\n            let request_id = ++this.request_id;\n            if (this.request_id >= Number.MAX_SAFE_INTEGER - 1) this.request_id = 0;\n            // send the query\n            this.socket.emit(event, {data, request_id: request_id});\n            this.socket.on(event + `_${request_id}_response`, (response: any) => {\n                //log('[Connection][Query] got response from ', this.targetType, 'event: ', event, 'response: ', response)\n                // clear the timeout\n                clearTimeout(timeout);\n                // clear the listener\n                this.socket.removeAllListeners(event + `_${request_id}_response`);\n                // resolve the response\n                resolve(response);\n            });\n        });\n    }\n\n    public send = this.query;\n\n    private respond(event: string, callback: Function) {\n        /* this is a wrapper function to respond to a query */\n        return async (parameters: any) => {\n            let data = parameters.data;\n            let request_id = parameters.request_id;\n            let response = await callback(data);\n            this.socket.emit(event + `_${request_id}_response`, response);\n        }\n    }\n\n    public getListeners(): any[] {\n        if(this.type === 'server')\n            return this.listeners;\n        else if(this.type === 'client')\n            return this.socket._callbacks;\n        else\n            throw new Error('Connection type not recognized');\n    }\n\n    public close(): void {\n        this.socket.disconnect();\n    }\n\n}\n\nexport default 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