stream: fix not calling cleanup() when unpiping all streams. #18266

MoonBall · 2018-01-20T03:46:46Z

After a readable stream pipes more than one writable streams, I calls readable.unpipe() to remove all piped writable stream. I find that only the first piped writable stream calls the cleanup(), the others don't call cleanup().

Checklist

make -j4 test (UNIX), or vcbuild test (Windows) passes
tests and/or benchmarks are included
documentation is changed or added
commit message follows commit guidelines

Affected core subsystem(s)

stream

lpinca · 2018-01-20T07:21:41Z

lib/_stream_readable.js

@@ -758,8 +758,10 @@ Readable.prototype.unpipe = function(dest) {
    state.pipesCount = 0;
    state.flowing = false;

-    for (var i = 0; i < len; i++)
+    for (var i = 0; i < len; i++) {
+      unpipeInfo = { hasUnpiped: false };


For other reviewers, we need a new object becausedest sets unpipeInfo.hasUnpiped to true when 'unpipe' is emitted.

On second thought, doesn't this make the hasUnpiped guard useless? I mean, no matter what, dest will always find hasUnpiped false.

I found the PR which adds the hasUnpiped. you can see it.

@lpinca hasUnpiped solved the situation that a readable stram piped the same writable stream more than one time. This change has no influence to it.

Ok yes, it seems correct as this is for the "remove all" case.

lpinca · 2018-01-20T07:22:56Z

lib/_stream_readable.js

@@ -758,8 +758,10 @@ Readable.prototype.unpipe = function(dest) {
    state.pipesCount = 0;
    state.flowing = false;

-    for (var i = 0; i < len; i++)
+    for (var i = 0; i < len; i++) {
+      unpipeInfo = { hasUnpiped: false };
      dests[i].emit('unpipe', this, unpipeInfo);


Tiny nit: I'd just create the new object here, without using the above assignment.

There are three situations to use unpipeInfo. The above assignment can be used in two situations. I’m also fine to assign it just before using it.

lpinca · 2018-01-20T08:08:34Z

lib/_stream_readable.js

@@ -758,8 +758,12 @@ Readable.prototype.unpipe = function(dest) {
    state.pipesCount = 0;
    state.flowing = false;

-    for (var i = 0; i < len; i++)
+    // use the above assignment
+    dests[0].emit('unpipe', this, unpipeInfo);


What I meant in my previous comment was:

for (var i = 0; i < len; i++) dests[i].emit('unpipe', this, { hasUnpiped: false });

Refs: nodejs#12746

targos · 2018-01-20T08:49:14Z

/cc @nodejs/streams

apapirovski

The fix here seems good although I would prefer a test that accounts for more stuff within cleanup().

mcollina

LGTM

MoonBall · 2018-01-20T14:12:53Z

@apapirovski I added more test contents.

lpinca · 2018-01-21T20:21:16Z

test/parallel/test-stream-pipe-unpipe-streams.js

+
+    const unpipeChecker = common.mustCall(() => {
+      assert.strictEqual(
+        dest.listenerCount('unpipe'), 1,


Nit: I'd simplify this as

assert.deepStrictEqual(dest.listeners('unpipe'), [unpipeChecker]);

lpinca · 2018-01-21T20:30:18Z

test/parallel/test-stream-pipe-unpipe-streams.js

+    srcCheckEventNames.forEach((eventName) => {
+      assert.strictEqual(
+        source.listenerCount(eventName), 0,
+        `source's '${eventName}' event listeners don't be cleaned up`


Nit: replace "don't be cleaned up" with "not removed", same below.

BridgeAR · 2018-02-01T16:05:28Z

CI https://ci.nodejs.org/job/node-test-pull-request/12891/

addaleax · 2018-02-04T15:51:14Z

@MoonBall I think with this we can remove unpipeInfo altogether?

MoonBall · 2018-02-04T16:41:47Z

@addaleax The #12746 will be reverted If we remove unpipeInfo altogether. This PR didn't change the intention of #12746. It just fixed that calling unpipe() doesn't remove all piped stream.

This PR makes sure the object emitted as the 'unpipe' event in the destination stream is not shared between destination, as it would be muted. Refs: #12746 PR-URL: #18266 Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]> Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Anna Henningsen <[email protected]>

mcollina · 2018-02-05T11:32:39Z

Landed as a52b7a2.

This PR makes sure the object emitted as the 'unpipe' event in the destination stream is not shared between destination, as it would be muted. Refs: #12746 PR-URL: #18266 Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]> Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Anna Henningsen <[email protected]>

nodejs-github-bot added the stream Issues and PRs related to the stream subsystem. label Jan 20, 2018

lpinca approved these changes Jan 20, 2018

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lpinca reviewed Jan 20, 2018

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stream: fix not calling cleanup() when unpiping all streams.

3500d5f

Refs: nodejs#12746

MoonBall force-pushed the fix-unpiping-all-piped-streams branch from 08153b1 to 3500d5f Compare January 20, 2018 08:26

apapirovski approved these changes Jan 20, 2018

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mcollina approved these changes Jan 20, 2018

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mcollina added lts-watch-v6.x labels Jan 20, 2018

陈刚 added 2 commits January 20, 2018 22:04

Add more test content

020956f

Fix lint

8da1b72

lpinca approved these changes Jan 21, 2018

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Fix code style

eba4582

jasnell approved these changes Jan 22, 2018

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maclover7 force-pushed the master branch from bb5575a to 993b716 Compare January 26, 2018 22:02

cjihrig force-pushed the master branch from 993b716 to 082f952 Compare January 26, 2018 22:36

BridgeAR approved these changes Feb 1, 2018

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BridgeAR added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Feb 1, 2018

addaleax approved these changes Feb 4, 2018

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mcollina closed this Feb 5, 2018

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stream: fix not calling cleanup() when unpiping all streams. #18266

stream: fix not calling cleanup() when unpiping all streams. #18266

MoonBall commented Jan 20, 2018 •

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mcollina commented Feb 5, 2018

stream: fix not calling cleanup() when unpiping all streams. #18266

stream: fix not calling cleanup() when unpiping all streams. #18266

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MoonBall commented Jan 20, 2018 • edited Loading

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Affected core subsystem(s)

lpinca Jan 20, 2018 • edited Loading

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