var _ = require('lodash')
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var logger = require('./logger').getInstance()
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module.exports = {
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init: init,
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getHandlers: getProxyEventHandlers
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}
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function init(proxy, opts) {
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var handlers = getProxyEventHandlers(opts)
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_.forIn(handlers, function(handler, eventName) {
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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: ', _.keys(handlers))
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}
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function getProxyEventHandlers(opts) {
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// https://github.com/nodejitsu/node-http-proxy#listening-for-proxy-events
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var proxyEvents = [
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'error',
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'proxyReq',
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'proxyReqWs',
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'proxyRes',
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'open',
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'close'
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]
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var handlers = {}
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_.forEach(proxyEvents, function(event) {
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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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var eventName = _.camelCase('on ' + event)
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var fnHandler = _.get(opts, 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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function defaultErrorHandler(err, req, res) {
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var host = req.headers && req.headers.host
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var 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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} 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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