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serve sourcemap for socket.io-client #2482

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merged 4 commits into from
Nov 24, 2016
Merged

serve sourcemap for socket.io-client #2482

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e59220a
serve sourcemap from server
paradite Mar 10, 2016
00db9e5
handled case where sourcemap is not available
paradite Mar 10, 2016
66ed6d7
Merge branch 'master' into sourcemap
paradite Nov 23, 2016
e35f4bd
update sourcemap for on demand load and ETag standard
paradite Nov 23, 2016
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41 changes: 40 additions & 1 deletion lib/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@ module.exports = Server;
*/

var clientSource = undefined;
var clientSourceMap = undefined;

/**
* Server constructor.
Expand Down Expand Up @@ -98,6 +99,11 @@ Server.prototype.serveClient = function(v){

if (v && !clientSource) {
clientSource = read(require.resolve('socket.io-client/socket.io.js'), 'utf-8');
try {
clientSourceMap = read(require.resolve('socket.io-client/socket.io.js.map'), 'utf-8');
} catch(err) {
debug('could not load sourcemap file');
}
}

return this;
Expand Down Expand Up @@ -255,11 +261,14 @@ Server.prototype.attach = function(srv, opts){
Server.prototype.attachServe = function(srv){
debug('attaching client serving req handler');
var url = this._path + '/socket.io.js';
var urlMap = this._path + '/socket.io.js.map';
var evs = srv.listeners('request').slice(0);
var self = this;
srv.removeAllListeners('request');
srv.on('request', function(req, res) {
if (0 === req.url.indexOf(url)) {
if (0 === req.url.indexOf(urlMap)) {
self.serveMap(req, res);
} else if (0 === req.url.indexOf(url)) {
self.serve(req, res);
} else {
for (var i = 0; i < evs.length; i++) {
Expand Down Expand Up @@ -299,6 +308,36 @@ Server.prototype.serve = function(req, res){
res.end(clientSource);
};

/**
* Handles a request serving `/socket.io.js.map`
*
* @param {http.Request} req
* @param {http.Response} res
* @api private
*/

Server.prototype.serveMap = function(req, res){
// Per the standard, ETags must be quoted:
// https://tools.ietf.org/html/rfc7232#section-2.3
var expectedEtag = '"' + clientVersion + '"';

var etag = req.headers['if-none-match'];
if (etag) {
if (expectedEtag == etag) {
debug('serve client 304');
res.writeHead(304);
res.end();
return;
}
}

debug('serve client sourcemap');
res.setHeader('Content-Type', 'application/json');
res.setHeader('ETag', expectedEtag);
res.writeHead(200);
res.end(clientSourceMap);
};

/**
* Binds socket.io to an engine.io instance.
*
Expand Down