65 lines
2.3 KiB
JavaScript
Executable File
65 lines
2.3 KiB
JavaScript
Executable File
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.getHandlers = exports.init = void 0;
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const _ = require("lodash");
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const logger_1 = require("./logger");
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const logger = logger_1.getInstance();
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function init(proxy, option) {
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const handlers = getHandlers(option);
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for (const eventName of Object.keys(handlers)) {
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proxy.on(eventName, handlers[eventName]);
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}
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logger.debug('[HPM] Subscribed to http-proxy events:', Object.keys(handlers));
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}
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exports.init = init;
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function getHandlers(options) {
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// https://github.com/nodejitsu/node-http-proxy#listening-for-proxy-events
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const proxyEvents = ['error', 'proxyReq', 'proxyReqWs', 'proxyRes', 'open', 'close'];
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const handlers = {};
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for (const event of proxyEvents) {
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// all handlers for the http-proxy events are prefixed with 'on'.
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// loop through options and try to find these handlers
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// and add them to the handlers object for subscription in init().
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const eventName = _.camelCase('on ' + event);
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const fnHandler = _.get(options, eventName);
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if (_.isFunction(fnHandler)) {
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handlers[event] = fnHandler;
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}
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}
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// add default error handler in absence of error handler
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if (!_.isFunction(handlers.error)) {
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handlers.error = defaultErrorHandler;
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}
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// add default close handler in absence of close handler
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if (!_.isFunction(handlers.close)) {
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handlers.close = logClose;
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}
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return handlers;
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}
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exports.getHandlers = getHandlers;
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function defaultErrorHandler(err, req, res) {
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const host = req.headers && req.headers.host;
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const code = err.code;
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if (res.writeHead && !res.headersSent) {
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if (/HPE_INVALID/.test(code)) {
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res.writeHead(502);
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}
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else {
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switch (code) {
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case 'ECONNRESET':
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case 'ENOTFOUND':
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case 'ECONNREFUSED':
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res.writeHead(504);
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break;
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default:
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res.writeHead(500);
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}
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}
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}
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res.end('Error occured while trying to proxy to: ' + host + req.url);
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}
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function logClose(req, socket, head) {
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// view disconnected websocket connections
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logger.info('[HPM] Client disconnected');
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}
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