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[v6.x backport] http: eliminate capture of ClientRequest in Agent #15500

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[v6.x backport] http: eliminate capture of ClientRequest in Agent #15500

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58 changes: 31 additions & 27 deletions lib/_http_agent.js
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Original file line number Diff line number Diff line change
Expand Up @@ -206,37 +206,41 @@ Agent.prototype.createSocket = function(req, options, cb) {
}
self.sockets[name].push(s);
debug('sockets', name, self.sockets[name].length);

function onFree() {
self.emit('free', s, options);
}
s.on('free', onFree);

function onClose(err) {
debug('CLIENT socket onClose');
// This is the only place where sockets get removed from the Agent.
// If you want to remove a socket from the pool, just close it.
// All socket errors end in a close event anyway.
self.removeSocket(s, options);
}
s.on('close', onClose);

function onRemove() {
// We need this function for cases like HTTP 'upgrade'
// (defined by WebSockets) where we need to remove a socket from the
// pool because it'll be locked up indefinitely
debug('CLIENT socket onRemove');
self.removeSocket(s, options);
s.removeListener('close', onClose);
s.removeListener('free', onFree);
s.removeListener('agentRemove', onRemove);
}
s.on('agentRemove', onRemove);
installListeners(self, s, options);
cb(null, s);
}
};

Agent.prototype.removeSocket = function(s, options) {
function installListeners(agent, s, options) {
function onFree() {
debug('CLIENT socket onFree');
agent.emit('free', s, options);
}
s.on('free', onFree);

function onClose(err) {
debug('CLIENT socket onClose');
// This is the only place where sockets get removed from the Agent.
// If you want to remove a socket from the pool, just close it.
// All socket errors end in a close event anyway.
agent.removeSocket(s, options);
}
s.on('close', onClose);

function onRemove() {
// We need this function for cases like HTTP 'upgrade'
// (defined by WebSockets) where we need to remove a socket from the
// pool because it'll be locked up indefinitely
debug('CLIENT socket onRemove');
agent.removeSocket(s, options);
s.removeListener('close', onClose);
s.removeListener('free', onFree);
s.removeListener('agentRemove', onRemove);
}
s.on('agentRemove', onRemove);
}

Agent.prototype.removeSocket = function removeSocket(s, options) {
var name = this.getName(options);
debug('removeSocket', name, 'writable:', s.writable);
var sets = [this.sockets];
Expand Down