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75 lines
2.6 KiB
75 lines
2.6 KiB
3 years ago
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"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 logger_1 = require("./logger");
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const logger = (0, 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 proxyEventsMap = {
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error: 'onError',
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proxyReq: 'onProxyReq',
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proxyReqWs: 'onProxyReqWs',
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proxyRes: 'onProxyRes',
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open: 'onOpen',
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close: 'onClose',
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};
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const handlers = {};
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for (const [eventName, onEventName] of Object.entries(proxyEventsMap)) {
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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 fnHandler = options ? options[onEventName] : null;
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if (typeof fnHandler === 'function') {
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handlers[eventName] = 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 (typeof handlers.error !== 'function') {
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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 (typeof handlers.close !== 'function') {
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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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// Re-throw error. Not recoverable since req & res are empty.
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if (!req && !res) {
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throw err; // "Error: Must provide a proper URL as target"
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}
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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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case 'ETIMEDOUT':
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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 occurred while trying to proxy: ${host}${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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