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net: Track state of setNoDelay and prevent unnecessary system calls. #31543

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net: Track state of setNoDelay and prevent unnecessary system calls. #31543

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d16af09
net: Track state of setNoDelay and prevent unnecessary system calls.
rustyconover Jan 28, 2020
dc6c315
Change to camelcase.
rustyconover Jan 28, 2020
5dfc9eb
Update test/parallel/test-net-socket-setnodelay.js
rustyconover Jan 30, 2020
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10 changes: 7 additions & 3 deletions lib/net.js
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Original file line number Diff line number Diff line change
Expand Up @@ -257,7 +257,7 @@ function initSocketHandle(self) {

const kBytesRead = Symbol('kBytesRead');
const kBytesWritten = Symbol('kBytesWritten');

const kSetNoDelay = Symbol('kSetNoDelay');

function Socket(options) {
if (!(this instanceof Socket)) return new Socket(options);
Expand All @@ -271,6 +271,7 @@ function Socket(options) {
this[kHandle] = null;
this._parent = null;
this._host = null;
this[kSetNoDelay] = false;
this[kLastWriteQueueSize] = 0;
this[kTimeout] = null;
this[kBuffer] = null;
Expand Down Expand Up @@ -488,8 +489,11 @@ Socket.prototype.setNoDelay = function(enable) {
}

// Backwards compatibility: assume true when `enable` is omitted
if (this._handle.setNoDelay)
this._handle.setNoDelay(enable === undefined ? true : !!enable);
const newValue = enable === undefined ? true : !!enable;
if (this._handle.setNoDelay && newValue !== this[kSetNoDelay]) {
this[kSetNoDelay] = newValue;
this._handle.setNoDelay(newValue);
}

return this;
};
Expand Down
12 changes: 10 additions & 2 deletions test/parallel/test-net-socket-setnodelay.js
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Original file line number Diff line number Diff line change
Expand Up @@ -20,18 +20,26 @@ socket.setNoDelay();

socket = new net.Socket({
handle: {
setNoDelay: common.mustCall(genSetNoDelay(true), truthyValues.length)
setNoDelay: common.mustCall(genSetNoDelay(true), 1)
}
});
truthyValues.forEach((testVal) => socket.setNoDelay(testVal));

socket = new net.Socket({
handle: {
setNoDelay: common.mustCall(genSetNoDelay(false), falseyValues.length)
setNoDelay: common.mustNotCall()
}
});
falseyValues.forEach((testVal) => socket.setNoDelay(testVal));

socket = new net.Socket({
handle: {
setNoDelay: common.mustCall(() => {}, 3)
}
});
truthyValues.concat(falseyValues).concat(truthyValues)
.forEach((testVal) => socket.setNoDelay(testVal));

// If a handler doesn't have a setNoDelay function it shouldn't be called.
// In the case below, if it is called an exception will be thrown
socket = new net.Socket({
Expand Down