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http: Eliminate ClientRequest capture by Agent socket listeners #10134

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http: Eliminate ClientRequest capture by Agent socket listeners #10134

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3967101
Eliminate capture of "cb" in createSocket context
evantorrie Dec 5, 2016
f774e72
change to local function instead of prototype
evantorrie Dec 6, 2016
eb5b0d3
change self to agent
evantorrie Dec 7, 2016
518d33d
http: eliminate capture of ClientRequest in Agent
evantorrie Dec 8, 2016
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56 changes: 30 additions & 26 deletions lib/_http_agent.js
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Original file line number Diff line number Diff line change
Expand Up @@ -206,36 +206,40 @@ Agent.prototype.createSocket = function createSocket(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);
}
};

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);
Expand Down