RTL/backend/controllers/lnd/webSocketClient.js

import request from 'request-promise';
import * as fs from 'fs';
import { join } from 'path';
import { Logger } from '../../utils/logger.js';
import { Common } from '../../utils/common.js';
import { WSServer } from '../../utils/webSocketServer.js';
export class LNDWebSocketClient {
    constructor() {
        this.logger = Logger;
        this.common = Common;
        this.wsServer = WSServer;
        this.webSocketClients = [];
        this.connect = (selectedNode) => {
            try {
                const clientExists = this.webSocketClients.find((wsc) => wsc.selectedNode.index === selectedNode.index);
                if (!clientExists && selectedNode.ln_server_url) {
                    const newWebSocketClient = { selectedNode: selectedNode };
                    this.webSocketClients.push(newWebSocketClient);
                }
            }
            catch (err) {
                throw new Error(err);
            }
        };
        this.fetchUnpaidInvoices = (selectedNode) => {
            this.logger.log({ selectedNode: selectedNode, level: 'INFO', fileName: 'WebSocketClient', msg: 'Getting Unpaid Invoices..' });
            const options = this.setOptionsForSelNode(selectedNode);
            options.url = selectedNode.ln_server_url + '/v1/invoices?pending_only=true';
            return request(options).then((body) => {
                this.logger.log({ selectedNode: selectedNode, level: 'INFO', fileName: 'WebSocketClient', msg: 'Unpaid Invoices Received', data: body });
                if (body.invoices && body.invoices.length > 0) {
                    body.invoices.forEach((invoice) => {
                        if (invoice.state === 'OPEN') {
                            this.subscribeToInvoice(options, selectedNode, invoice.r_hash);
                        }
                    });
                }
                return null;
            }).catch((errRes) => {
                const err = this.common.handleError(errRes, 'WebSocketClient', 'Pending Invoices Error', selectedNode);
                return ({ message: err.message, error: err.error });
            });
        };
        this.subscribeToInvoice = (options, selectedNode, rHash) => {
            rHash = rHash.replace(/\+/g, '-').replace(/[/]/g, '_');
            this.logger.log({ selectedNode: selectedNode, level: 'INFO', fileName: 'WebSocketClient', msg: 'Subscribing to Invoice ' + rHash + ' ..' });
            options.url = selectedNode.ln_server_url + '/v2/invoices/subscribe/' + rHash;
            request(options).then((msg) => {
                this.logger.log({ selectedNode: selectedNode, level: 'INFO', fileName: 'WebSocketClient', msg: 'Invoice Information Received for ' + rHash });
                if (typeof msg === 'string') {
                    const results = msg.split('\n');
                    msg = (results.length && results.length > 1) ? JSON.parse(results[1]) : JSON.parse(msg);
                    msg.result.r_preimage = msg.result.r_preimage ? Buffer.from(msg.result.r_preimage, 'base64').toString('hex') : '';
                    msg.result.r_hash = msg.result.r_hash ? Buffer.from(msg.result.r_hash, 'base64').toString('hex') : '';
                    msg.result.description_hash = msg.result.description_hash ? Buffer.from(msg.result.description_hash, 'base64').toString('hex') : null;
                }
                msg['type'] = 'invoice';
                msg['source'] = 'LND';
                const msgStr = JSON.stringify(msg);
                this.logger.log({ selectedNode: selectedNode, level: 'INFO', fileName: 'WebSocketClient', msg: 'Invoice Info Received', data: msgStr });
                this.wsServer.sendEventsToAllLNClients(msgStr, selectedNode);
            }).catch((errRes) => {
                const err = this.common.handleError(errRes, 'Invoices', 'Subscribe to Invoice Error for ' + rHash, selectedNode);
                const errStr = ((typeof err === 'object' && err.message) ? JSON.stringify({ error: err.message + ' ' + rHash }) : (typeof err === 'object') ? JSON.stringify({ error: err + ' ' + rHash }) : ('{ "error": ' + err + ' ' + rHash + ' }'));
                this.wsServer.sendErrorToAllLNClients(errStr, selectedNode);
            });
        };
        this.subscribeToPayment = (options, selectedNode, paymentHash) => {
            this.logger.log({ selectedNode: selectedNode, level: 'INFO', fileName: 'WebSocketClient', msg: 'Subscribing to Payment ' + paymentHash + ' ..' });
            options.url = selectedNode.ln_server_url + '/v2/router/track/' + paymentHash;
            request(options).then((msg) => {
                this.logger.log({ selectedNode: selectedNode, level: 'INFO', fileName: 'WebSocketClient', msg: 'Payment Information Received for ' + paymentHash });
                msg['type'] = 'payment';
                msg['source'] = 'LND';
                const msgStr = JSON.stringify(msg);
                this.logger.log({ selectedNode: selectedNode, level: 'INFO', fileName: 'WebSocketClient', msg: 'Payment Info Received', data: msgStr });
                this.wsServer.sendEventsToAllLNClients(msgStr, selectedNode);
            }).catch((errRes) => {
                const err = this.common.handleError(errRes, 'Payment', 'Subscribe to Payment Error for ' + paymentHash, selectedNode);
                const errStr = ((typeof err === 'object' && err.message) ? JSON.stringify({ error: err.message + ' ' + paymentHash }) : (typeof err === 'object') ? JSON.stringify({ error: err + ' ' + paymentHash }) : ('{ "error": ' + err + ' ' + paymentHash + ' }'));
                this.wsServer.sendErrorToAllLNClients(errStr, selectedNode);
            });
        };
        this.setOptionsForSelNode = (selectedNode) => {
            const options = { url: '', rejectUnauthorized: false, json: true, form: null };
            try {
                options['headers'] = { 'Grpc-Metadata-macaroon': fs.readFileSync(join(selectedNode.macaroon_path, 'admin.macaroon')).toString('hex') };
            }
            catch (err) {
                this.logger.log({ selectedNode: selectedNode, level: 'ERROR', fileName: 'WebSocketClient', msg: 'Set Options Error', error: JSON.stringify(err) });
            }
            return options;
        };
        this.disconnect = (selectedNode) => {
            const clientExists = this.webSocketClients.find((wsc) => wsc.selectedNode.index === selectedNode.index);
            if (clientExists) {
                this.logger.log({ selectedNode: clientExists.selectedNode, level: 'INFO', fileName: 'CLWebSocket', msg: 'Disconnecting from the LND\'s Websocket Server..' });
                const clientIdx = this.webSocketClients.findIndex((wsc) => wsc.selectedNode.index === selectedNode.index);
                this.webSocketClients.splice(clientIdx, 1);
            }
        };
        this.updateSelectedNode = (newSelectedNode) => {
            const clientIdx = this.webSocketClients.findIndex((wsc) => +wsc.selectedNode.index === +newSelectedNode.index);
            let newClient = this.webSocketClients[clientIdx];
            if (!newClient) {
                newClient = { selectedNode: null };
            }
            newClient.selectedNode = JSON.parse(JSON.stringify(newSelectedNode));
            this.webSocketClients[clientIdx] = newClient;
            if (this.webSocketClients[clientIdx].selectedNode.ln_version === '' || !this.webSocketClients[clientIdx].selectedNode.ln_version || this.common.isVersionCompatible(this.webSocketClients[clientIdx].selectedNode.ln_version, '0.11.0')) {
                this.fetchUnpaidInvoices(this.webSocketClients[clientIdx].selectedNode);
            }
        };
        this.wsServer.eventEmitterLND.on('CONNECT', (nodeIndex) => {
            this.connect(this.common.findNode(+nodeIndex));
        });
        this.wsServer.eventEmitterLND.on('DISCONNECT', (nodeIndex) => {
            this.disconnect(this.common.findNode(+nodeIndex));
        });
    }
}
export const LNDWSClient = new LNDWebSocketClient();