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http: Change free sockets behavior to LIFO from FIFO. #31526

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http: Change free sockets behavior to LIFO from FIFO. #31526

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http: Change free sockets behavior to LIFO from FIFO.
rustyconover Jan 26, 2020
b43479f
test: Add test http agent keepalive LIFO behavior
rustyconover Feb 29, 2020
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17 changes: 11 additions & 6 deletions lib/_http_agent.js
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Original file line number Diff line number Diff line change
Expand Up @@ -112,11 +112,16 @@ function Agent(options) {
if (this.sockets[name])
count += this.sockets[name].length;

if (count > this.maxSockets || freeLen >= this.maxFreeSockets) {
socket.destroy();
} else if (this.keepSocketAlive(socket)) {
freeSockets = freeSockets || [];
this.freeSockets[name] = freeSockets;
if (this.keepSocketAlive(socket) &&
this.maxFreeSockets > 0 &&
count <= this.maxSockets) {
if (freeLen >= this.maxFreeSockets) {
const oldest = this.freeSockets[name].shift();
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nit, freeSockets.shift()

oldest.destroy();
} else {
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nit, else if (!freeSockets)

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I'm not quite following, could you explain a bit more.

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the block inside of the else is for the case when !freeSockets, could be simplified

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it's a nit, no biggie

freeSockets = freeSockets || [];
this.freeSockets[name] = freeSockets;
}
socket[async_id_symbol] = -1;
socket._httpMessage = null;
this.removeSocket(socket, options);
Expand Down Expand Up @@ -207,7 +212,7 @@ Agent.prototype.addRequest = function addRequest(req, options, port/* legacy */,

if (freeLen) {
// We have a free socket, so use that.
const socket = this.freeSockets[name].shift();
const socket = this.freeSockets[name].pop();
// Guard against an uninitialized or user supplied Socket.
const handle = socket._handle;
if (handle && typeof handle.asyncReset === 'function') {
Expand Down