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http: fix ServerResponse does not emit 'close'
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Refs #2453.
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@koichik
koichik committed Jan 6, 2012
1 parent 78dbb4b commit dd9593c
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Showing 3 changed files with 37 additions and 20 deletions.
7 changes: 7 additions & 0 deletions doc/api/http.markdown
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Expand Up @@ -247,6 +247,13 @@ authentication details.
This object is created internally by a HTTP server--not by the user. It is
passed as the second parameter to the `'request'` event. It is a `Writable Stream`.

### Event: 'close'

`function () { }`

Indicates that the underlaying connection was terminated before
`response.end()` was called or able to flush.

### response.writeContinue()

Sends a HTTP/1.1 100 Continue message to the client, indicating that
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36 changes: 20 additions & 16 deletions lib/http.js
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Expand Up @@ -343,22 +343,6 @@ util.inherits(OutgoingMessage, stream.Stream);
exports.OutgoingMessage = OutgoingMessage;


OutgoingMessage.prototype.assignSocket = function(socket) {
assert(!socket._httpMessage);
socket._httpMessage = this;
this.socket = socket;
this.connection = socket;
this._flush();
};


OutgoingMessage.prototype.detachSocket = function(socket) {
assert(socket._httpMessage == this);
socket._httpMessage = null;
this.socket = this.connection = null;
};


OutgoingMessage.prototype.destroy = function(error) {
this.socket.destroy(error);
};
Expand Down Expand Up @@ -792,6 +776,26 @@ exports.ServerResponse = ServerResponse;

ServerResponse.prototype.statusCode = 200;

function onServerResponseClose() {
this._httpMessage.emit('close');
}

ServerResponse.prototype.assignSocket = function(socket) {
assert(!socket._httpMessage);
socket._httpMessage = this;
socket.on('close', onServerResponseClose);
this.socket = socket;
this.connection = socket;
this._flush();
};

ServerResponse.prototype.detachSocket = function(socket) {
assert(socket._httpMessage == this);
socket.removeListener('close', onServerResponseClose);
socket._httpMessage = null;
this.socket = this.connection = null;
};

ServerResponse.prototype.writeContinue = function() {
this._writeRaw('HTTP/1.1 100 Continue' + CRLF + CRLF, 'ascii');
this._sent100 = true;
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14 changes: 10 additions & 4 deletions test/simple/test-http-response-close.js
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Expand Up @@ -23,15 +23,20 @@ var common = require('../common');
var assert = require('assert');
var http = require('http');

var gotEnd = false;
var requestGotEnd = false;
var responseGotEnd = false;

var server = http.createServer(function(req, res) {
res.writeHead(200);
res.write('a');

req.on('close', function() {
console.error('aborted');
gotEnd = true;
console.error('request aborted');
requestGotEnd = true;
});
res.on('close', function() {
console.error('response aborted');
responseGotEnd = true;
});
});
server.listen(common.PORT);
Expand All @@ -51,5 +56,6 @@ server.on('listening', function() {
});

process.on('exit', function() {
assert.ok(gotEnd);
assert.ok(requestGotEnd);
assert.ok(responseGotEnd);
});

6 comments on commit dd9593c

@vulkanr
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i think "assignSocket" is called every time on keep-alive connections. The "close" event listeners will just keep ramping up until hitting the listener limit.

@bnoordhuis
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Do you have a test case I can try? The logic seems okay to me and I see a removal for every added 'close' listener.

@vulkanr
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plain vanilla handler:

app.get('/test', function(req,res) {
res.end();
});

  1. every "curl" (using localhost) will result in an exception (actually showing a bigger problem than i reported):
    curl -v http://localhost:8888/test

Uncaught TypeError: Cannot call method 'emit' of null
at Socket.onServerResponseClose (http.js:780:21)
at Socket.emit (events.js:88:20)
at Array. (net.js:320:10)
at EventEmitter._tickCallback (node.js:192:40)

  1. to show the problem i reported - simply issue that "curl" with multiple urls (default in curl is keep-alive). example:
    curl -v http://localhost:8888/test http://localhost:8888/test http://localhost:8888/test http://localhost:8888/test http://localhost:8888/test http://localhost:8888/test http://localhost:8888/test http://localhost:8888/test http://localhost:8888/test http://localhost:8888/test http://localhost:8888/test

server warning/exception:
(node) warning: possible EventEmitter memory leak detected. 11 listeners added. Use emitter.setMaxListeners() to increase limit.
Trace:
at Socket. (events.js:139:15)
at ServerResponse.assignSocket (http.js:786:10)
at HTTPParser.onIncoming (http.js:1454:11)
at HTTPParser.onHeadersComplete (http.js:102:31)
at Socket.ondata (http.js:1387:22)
at TCP.onread (net.js:354:27)

@bnoordhuis
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That's probably a bug in whatever library you're using. Below is a plain Node example that works fine with curl or ab -k:

require('http').createServer(function(req, res) {
  res.end();
}).listen(8000);

@vulkanr
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you are right. sorry for the trouble. it was an old piece of code which got included in my test. upgrade to 0.6.8 kicked the error in.

@kelnishi
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How did you resolve this? I've got the exact same error, but I'm not sure what old code would cause this.
edit: found the cause. It was the long-stack-traces module.

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