"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.getHandlers = exports.init = void 0;
const logger_1 = require("./logger");
const logger = (0, logger_1.getInstance)();
function init(proxy, option) {
const handlers = getHandlers(option);
for (const eventName of Object.keys(handlers)) {
proxy.on(eventName, handlers[eventName]);
}
// https://github.com/webpack/webpack-dev-server/issues/1642
proxy.on('econnreset', (error, req, res, target) => {
logger.error(`[HPM] ECONNRESET: %O`, error);
});
// https://github.com/webpack/webpack-dev-server/issues/1642#issuecomment-1104325120
proxy.on('proxyReqWs', (proxyReq, req, socket, options, head) => {
socket.on('error', (error) => {
logger.error(`[HPM] WebSocket error: %O`, error);
});
});
logger.debug('[HPM] Subscribed to http-proxy events:', Object.keys(handlers));
}
exports.init = init;
function getHandlers(options) {
// https://github.com/nodejitsu/node-http-proxy#listening-for-proxy-events
const proxyEventsMap = {
error: 'onError',
proxyReq: 'onProxyReq',
proxyReqWs: 'onProxyReqWs',
proxyRes: 'onProxyRes',
open: 'onOpen',
close: 'onClose',
};
const handlers = {};
for (const [eventName, onEventName] of Object.entries(proxyEventsMap)) {
// all handlers for the http-proxy events are prefixed with 'on'.
// loop through options and try to find these handlers
// and add them to the handlers object for subscription in init().
const fnHandler = options ? options[onEventName] : null;
if (typeof fnHandler === 'function') {
handlers[eventName] = fnHandler;
}
}
// add default error handler in absence of error handler
if (typeof handlers.error !== 'function') {
handlers.error = defaultErrorHandler;
}
// add default close handler in absence of close handler
if (typeof handlers.close !== 'function') {
handlers.close = logClose;
}
return handlers;
}
exports.getHandlers = getHandlers;
function defaultErrorHandler(err, req, res) {
// Re-throw error. Not recoverable since req & res are empty.
if (!req && !res) {
throw err; // "Error: Must provide a proper URL as target"
}
const host = req.headers && req.headers.host;
const code = err.code;
if (res.writeHead && !res.headersSent) {
if (/HPE_INVALID/.test(code)) {
res.writeHead(502);
}
else {
switch (code) {
case 'ECONNRESET':
case 'ENOTFOUND':
case 'ECONNREFUSED':
case 'ETIMEDOUT':
res.writeHead(504);
break;
default:
res.writeHead(500);
}
}
}
res.end(`Error occurred while trying to proxy: ${host}${req.url}`);
}
function logClose(req, socket, head) {
// view disconnected websocket connections
logger.info('[HPM] Client disconnected');
}