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[x] stream: eos avoid listeners when possible #28751

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ronag wants to merge 4 commits into from
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[x] stream: eos avoid listeners when possible #28751

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feaa7a3
stream: eos avoid listeners when not legacy compat
ronag Jul 18, 2019
07a93a0
stream: conditionally create legacy handlers
ronag Jul 30, 2019
d213f7a
stream: prefer let over var
ronag Jul 30, 2019
edb7e47
stream: conditionally create error handler
ronag Jul 30, 2019
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103 changes: 61 additions & 42 deletions 103 lib/internal/streams/end-of-stream.js
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Original file line number Diff line number Diff line change
Expand Up @@ -9,10 +9,6 @@ const {
} = require('internal/errors').codes;
const { once } = require('internal/util');

function isRequest(stream) {
return stream.setHeader && typeof stream.abort === 'function';
}

function eos(stream, opts, callback) {
if (arguments.length === 2) {
callback = opts;
Expand All @@ -31,28 +27,33 @@ function eos(stream, opts, callback) {
let readable = opts.readable || (opts.readable !== false && stream.readable);
let writable = opts.writable || (opts.writable !== false && stream.writable);

const onlegacyfinish = () => {
if (!stream.writable) onfinish();
};

var writableEnded = stream._writableState && stream._writableState.finished;
const onfinish = () => {
writable = false;
writableEnded = true;
if (!readable) callback.call(stream);
};
const isLegacyRequest = typeof stream.writableFinished !== 'boolean' &&
stream.setHeader && typeof stream.abort === 'function';
const isLegacyWritable = typeof stream.writableFinished !== 'boolean' &&
writable && !stream._writableState;

let writableEnded = stream._writableState && stream._writableState.finished;
let onfinish;
if (writable || isLegacyRequest || isLegacyWritable) {
onfinish = () => {
writable = false;
writableEnded = true;
if (!readable) callback.call(stream);
};
stream.on('finish', onfinish);
}

var readableEnded = stream.readableEnded ||
let readableEnded = stream.readableEnded ||
(stream._readableState && stream._readableState.endEmitted);
const onend = () => {
readable = false;
readableEnded = true;
if (!writable) callback.call(stream);
};

const onerror = (err) => {
callback.call(stream, err);
};
let onend;
if (readable) {
onend = () => {
readable = false;
readableEnded = true;
if (!writable) callback.call(stream);
};
stream.on('end', onend);
}

const onclose = () => {
let err;
Expand All @@ -67,36 +68,54 @@ function eos(stream, opts, callback) {
return callback.call(stream, err);
}
};
stream.on('close', onclose);

const onrequest = () => {
stream.req.on('finish', onfinish);
};
let onrequest;
let onlegacyfinish;

if (isRequest(stream)) {
if (isLegacyRequest) {
onrequest = () => {
stream.req.on('finish', onfinish);
};
stream.on('complete', onfinish);
stream.on('abort', onclose);
if (stream.req) onrequest();
else stream.on('request', onrequest);
} else if (writable && !stream._writableState) { // legacy streams
} else if (isLegacyWritable) {
onlegacyfinish = () => {
if (!stream.writable) onfinish();
};
stream.on('end', onlegacyfinish);
stream.on('close', onlegacyfinish);
}

stream.on('end', onend);
stream.on('finish', onfinish);
if (opts.error !== false) stream.on('error', onerror);
stream.on('close', onclose);
let onerror;
if (opts.error !== false) {
onerror = (err) => {
callback.call(stream, err);
};
stream.on('error', onerror);
}

return function() {
stream.removeListener('complete', onfinish);
stream.removeListener('abort', onclose);
stream.removeListener('request', onrequest);
if (stream.req) stream.req.removeListener('finish', onfinish);
stream.removeListener('end', onlegacyfinish);
stream.removeListener('close', onlegacyfinish);
stream.removeListener('finish', onfinish);
stream.removeListener('end', onend);
stream.removeListener('error', onerror);
if (onrequest) {
stream.removeListener('complete', onfinish);
stream.removeListener('abort', onclose);
stream.removeListener('request', onrequest);
if (stream.req) stream.req.removeListener('finish', onfinish);
} else if (onlegacyfinish) {
stream.removeListener('end', onlegacyfinish);
stream.removeListener('close', onlegacyfinish);
}
if (onerror) {
stream.removeListener('error', onerror);
}
if (onfinish) {
stream.removeListener('finish', onfinish);
}
if (onend) {
stream.removeListener('end', onend);
}
stream.removeListener('close', onclose);
};
}
Expand Down
77 changes: 75 additions & 2 deletions 77 test/parallel/test-stream-finished.js
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Original file line number Diff line number Diff line change
Expand Up @@ -155,6 +155,15 @@ const { promisify } = require('util');
rs.resume();
}

{
const streamLike = new EE();
streamLike.readableEnded = true;
streamLike.readable = true;
finished(streamLike, common.mustCall);
checkListeners(streamLike, 'legacy');
streamLike.emit('close');
}

// Test that calling returned function removes listeners
{
const ws = new Writable({
Expand All @@ -163,24 +172,88 @@ const { promisify } = require('util');
}
});
const removeListener = finished(ws, common.mustNotCall());
checkListeners(ws);
removeListener();
checkListeners(ws, 'none');
ws.end();
}

{
const rs = new Readable();
const removeListeners = finished(rs, common.mustNotCall());
checkListeners(rs);
removeListeners();
checkListeners(rs, 'none');

rs.emit('close');
rs.push(null);
rs.resume();
}

{
const req = Object.assign(new EE(), {
setHeader() {},
abort() {}
});
const removeListeners = finished(req, common.mustNotCall());
checkListeners(req, 'legacyrequest');
removeListeners();
checkListeners(req, 'none');
}

{
const streamLike = new EE();
streamLike.readableEnded = true;
streamLike.readable = true;
finished(streamLike, common.mustCall);
streamLike.emit('close');
const removeListeners = finished(streamLike, common.mustCall);
checkListeners(streamLike);
removeListeners();
checkListeners(streamLike, 'none');
}

{
const streamLike = new EE();
streamLike.readableEnded = true;
streamLike.writable = true;
const removeListeners = finished(streamLike, common.mustCall);
checkListeners(streamLike, 'legacywritable');
removeListeners();
checkListeners(streamLike, 'none');
}

function checkListeners(stream, type) {
if (type === 'legacyrequest') {
assert.strictEqual(stream.listenerCount('complete'), 1);
assert.strictEqual(stream.listenerCount('abort'), 1);
assert.strictEqual(stream.listenerCount('request'), 1);
assert.strictEqual(stream.listenerCount('close'), 1);
assert.strictEqual(stream.listenerCount('finish'), 1);
assert.strictEqual(stream.listenerCount('end'), 0);
assert.strictEqual(stream.listenerCount('request'), 1);
} else if (type === 'legacywritable') {
assert.strictEqual(stream.listenerCount('complete'), 0);
assert.strictEqual(stream.listenerCount('abort'), 0);
assert.strictEqual(stream.listenerCount('request'), 0);
assert.strictEqual(stream.listenerCount('close'), 2);
assert.strictEqual(stream.listenerCount('finish'), 1);
assert.strictEqual(stream.listenerCount('end'), 1);
} else if (type === 'none') {
assert.strictEqual(stream.listenerCount('complete'), 0);
assert.strictEqual(stream.listenerCount('abort'), 0);
assert.strictEqual(stream.listenerCount('request'), 0);
assert.strictEqual(stream.listenerCount('close'), 0);
assert.strictEqual(stream.listenerCount('end'), 0);
assert.strictEqual(stream.listenerCount('finish'), 0);
} else {
assert.strictEqual(stream.listenerCount('complete'), 0);
assert.strictEqual(stream.listenerCount('abort'), 0);
assert.strictEqual(stream.listenerCount('request'), 0);
assert.strictEqual(stream.listenerCount('close'), 1);
if (stream.writable) {
assert.strictEqual(stream.listenerCount('finish'), 1);
}
if (stream.readable) {
assert.strictEqual(stream.listenerCount('end'), 1);
}
}
}
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