xud/dist/http/HttpServer.js

Exchange Union Daemon

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const http_1 = __importDefault(require("http"));
const HttpService_1 = __importDefault(require("./HttpService"));
class HttpServer {
    constructor(logger, service) {
        this.logger = logger;
        this.processRequest = (req, res) => __awaiter(this, void 0, void 0, function* () {
            let statusCode = 200;
            let resJson;
            let reqJson;
            try {
                reqJson = yield this.reqToJson(req);
            }
            catch (err) {
                statusCode = 400;
                resJson = { message: JSON.stringify(err), retry: false };
            }
            if (reqJson) {
                try {
                    switch (req.url) {
                        case '/preimage':
                            resJson = yield this.httpService.providePreimage(reqJson);
                            break;
                        case '/incoming-transfer':
                            resJson = yield this.httpService.incomingTransfer(reqJson);
                            break;
                        case '/deposit-confirmed':
                            reqJson = this.httpService.depositConfirmed(reqJson);
                            break;
                        default:
                            throw new Error(`unable to process request to ${req.url}`);
                    }
                }
                catch (err) {
                    const msg = `processing request to ${req.url} failed`;
                    this.logger.error(msg, err);
                    statusCode = 500;
                    resJson = { message: msg };
                }
            }
            res.writeHead(statusCode, { 'Content-Type': 'application/json' });
            res.end(JSON.stringify(resJson));
        });
        this.requestListener = (req, res) => __awaiter(this, void 0, void 0, function* () {
            if (!req.headers['content-length']) {
                res.writeHead(411);
                res.end();
                return;
            }
            const SUPPORTED_ENDPOINTS = [
                '/preimage',
                '/incoming-transfer',
                '/deposit-confirmed',
            ];
            if (req.url && SUPPORTED_ENDPOINTS.includes(req.url)) {
                yield this.processRequest(req, res);
            }
            else {
                res.writeHead(404);
                res.end();
            }
        });
        this.reqToJson = (req) => {
            return new Promise((resolve, reject) => {
                const body = [];
                req.on('data', (chunk) => {
                    body.push(chunk);
                }).on('end', () => {
                    const bodyStr = Buffer.concat(body).toString();
                    const reqContentLength = parseInt(req.headers['content-length'] || '', 10);
                    if (bodyStr.length !== reqContentLength) {
                        reject('invalid content-length header');
                        return;
                    }
                    try {
                        const reqJson = JSON.parse(bodyStr);
                        this.logger.debug(`http server request json: ${JSON.stringify(reqJson)}`);
                        resolve(reqJson);
                    }
                    catch (err) {
                        reject('cannot parse request json');
                    }
                });
            });
        };
        /**
         * Starts the server and begins listening on the provided port.
         */
        this.listen = (port, host) => __awaiter(this, void 0, void 0, function* () {
            return new Promise((resolve, reject) => {
                const listenErrHandler = (err) => {
                    reject(err);
                };
                this.server.listen(port, host).once('listening', () => {
                    this.logger.info(`http server listening on ${host}:${port}`);
                    this.server.removeListener('error', listenErrHandler);
                    resolve();
                }).on('error', listenErrHandler);
            });
        });
        /**
         * Stops listening for requests.
         */
        this.close = () => {
            return new Promise((resolve) => {
                this.server.close(() => {
                    this.logger.info('http server has closed');
                    resolve();
                });
            });
        };
        this.server = http_1.default.createServer(this.requestListener);
        this.httpService = new HttpService_1.default(service);
    }
}
exports.default = HttpServer;
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