stream: eos on closed #28748

ronag · 2019-07-18T11:16:40Z

stream.finished should be invoked if stream is already closed/destroyed. Currently there is a potential deadlock depending on when stream.finished is called.

For writable premature close is close before finish, i.e. it should look for finished instead of ended.

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

Trott · 2019-07-23T00:00:53Z

/ping @nodejs/streams

nodejs-github-bot · 2019-07-23T00:01:28Z

CI: https://ci.nodejs.org/job/node-test-pull-request/24624/

mcollina

Would you mind to add the equivalent test for Readable as well?

lib/internal/streams/end-of-stream.js

test/parallel/test-stream-eos.js

ronag · 2019-07-23T07:33:23Z

@mcollina updated

lib/internal/streams/end-of-stream.js

ronag · 2019-08-02T06:35:42Z

@benjamingr ping

mcollina

LGTM

mcollina · 2019-08-03T16:53:48Z

@nodejs/tsc this needs another review.

ronag · 2019-08-06T09:26:39Z

@mcollina: Should this maybe result in a ERR_STREAM_DESTROYED?

ronag · 2019-09-01T14:15:38Z

Yes please.

@mcollina: done

ronag · 2019-09-01T15:59:24Z

@Trott: Updated PR description to describe the included changes from the other PR (which is now closed).

ronag · 2019-09-01T15:59:48Z

This needs another CITGM (once Travis is ok) given the recent changes.

ronag · 2019-09-01T16:00:49Z

lib/internal/streams/end-of-stream.js

-      return callback.call(stream, err);
+      callback.call(stream, new ERR_STREAM_PREMATURE_CLOSE());
+    } else if (writable && !writableFinished) {
+      callback.call(stream, new ERR_STREAM_PREMATURE_CLOSE());
    }


There is an added test for this change. We should always be emitting premature close unless we've seen finish or end events. I don't think this actually changes anything in practice.

nodejs-github-bot · 2019-09-01T17:39:14Z

CI: https://ci.nodejs.org/job/node-test-pull-request/25315/

nodejs-github-bot · 2019-09-01T18:01:57Z

CI: https://ci.nodejs.org/job/node-test-pull-request/25317/

mcollina · 2019-09-02T14:33:39Z

This will need a rebase, otherwise it looks good to land.

ronag · 2019-09-02T14:53:18Z

rebased

nodejs-github-bot · 2019-09-02T15:11:00Z

CI: https://ci.nodejs.org/job/node-test-pull-request/25326/

mcollina · 2019-09-03T08:29:26Z

Landed in b03845b

Make stream.finished callback invoked if stream is already closed/destroyed. PR-URL: #28748 Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Trivikram Kamat <[email protected]>

mafintosh · 2019-09-23T13:19:19Z

A little late to the party here, but this includes a big change in behaviour for streams.

Since the finished flag is used instead of the ended flag, this PR changes the behaiviour of eos to the following:

const stream = require('stream')
const ws = new stream.Writable({
  write (data, enc, cb) {
    process.nextTick(cb, null)
  }
})

finished(ws, function (err) {
  console.log('This used to *not* error:', err)
})

ws.write('data')
ws.end()
ws.emit('close') // modules tend to emit close on resource close but in a non error state

I was just bitten by this in a debugging session, so unsure if that was an intentional change?
If so I think it should be clearly documented :)

Streams are hard.

ronag force-pushed the stream-eos-on-closed branch 8 times, most recently from 3c57be4 to c9d1e19 Compare July 22, 2019 06:42

mcollina requested changes Jul 23, 2019

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mcollina requested changes Jul 23, 2019

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ronag mentioned this pull request Jul 23, 2019

stream: finished depends on internal API #28813

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ronag force-pushed the stream-eos-on-closed branch from c9d1e19 to 3816f11 Compare July 23, 2019 07:30

ronag force-pushed the stream-eos-on-closed branch 2 times, most recently from aefe068 to 1588c78 Compare July 23, 2019 07:37

mcollina requested changes Jul 23, 2019

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mcollina added the semver-major PRs that contain breaking changes and should be released in the next major version. label Jul 23, 2019

ronag force-pushed the stream-eos-on-closed branch 3 times, most recently from 40b4c0b to 39ca23a Compare July 24, 2019 09:46

Fishrock123 added the stream Issues and PRs related to the stream subsystem. label Jul 24, 2019

mcollina approved these changes Aug 2, 2019

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benjamingr approved these changes Aug 3, 2019

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mcollina requested a review from a team August 3, 2019 16:53

ronag mentioned this pull request Aug 6, 2019

stream: cleanup #29000

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2 tasks

ronag mentioned this pull request Sep 1, 2019

stream: eos premature close #28720

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4 tasks

ronag commented Sep 1, 2019

View reviewed changes

ronag added 12 commits September 2, 2019 16:49

stream: eos on closed

820074e

fixup: check ended and finished

729cd05

fixup: http response doesn't have destroyed, use aborted instead

e662280

fixup: tests

3ec6ecc

fixup: more tests

27a9624

fixup: merge nodejs#28720

5641590

fixup: sligthly simplify and add more tests

41a692a

fixup: test descriptions

3be0454

fixup: linting

53c04a3

fixup: merge duplicate test files

e8284ec

fixup: comments styling

a4542b7

fixup: typo when merging tests

9b5a84e

ronag force-pushed the stream-eos-on-closed branch from db6eb4f to 9b5a84e Compare September 2, 2019 14:52

mcollina closed this Sep 3, 2019

BethGriggs mentioned this pull request Sep 9, 2019

2019-10-22, Version 13.0.0 (Current) #29504

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stream: eos on closed #28748

stream: eos on closed #28748

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mafintosh commented Sep 23, 2019

stream: eos on closed #28748

stream: eos on closed #28748

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