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fs: do not emit 'finish' before 'open' on writing empty file #29930

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fs: do not emit 'finish' before 'open' on writing empty file #29930

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@ronag ronag commented Oct 11, 2019 •
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'finish' could previously be emitted before the file has been
created when ending a write stream without having written any
data.

Refs: expressjs/multer#238

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

@nodejs-github-bot nodejs-github-bot added the fs Issues and PRs related to the fs subsystem / file system. label Oct 11, 2019
This was referenced Oct 11, 2019
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@ronag ronag force-pushed the fs-fix-write-stream-open-final branch from 936bd44 to c0ba9a2 Compare October 11, 2019 10:19
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ronag commented Oct 11, 2019

@Trott @mcollina

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The commit has the wrong subsystem prefix. It’s not stream, but rather fs.

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Trott commented Oct 11, 2019

@nodejs/fs

@Trott Trott changed the title stream: don't emit 'finish' before 'open' on write empty file fs: do not emit 'finish' before 'open' on writing empty file Oct 11, 2019
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Trott commented Oct 11, 2019

The commit has the wrong subsystem prefix. It’s not stream, but rather fs.

I tried to amend the commit message but don't have permission to the nxtedition/node.git repo. But I did change the title of this PR to what I would recommend the commit message be changed to.

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LGTM with commit messages/subsytem changed to fs (and assuming no CI surprises).

Will run CITGM too to make sure this fixes the multer issue and doesn't unexpectedly create issues somewhere else.

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Trott commented Oct 11, 2019

CITGM: https://ci.nodejs.org/view/Node.js-citgm/job/citgm-smoker/2049/

@Trott Trott added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Oct 11, 2019
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fs: don't emit 'finish' before 'open' on write empty file
f341a47 
'finish' could previously be emitted before the file has been
created when ending a write stream without having written any
data.

Refs: expressjs/multer#238
@ronag ronag force-pushed the fs-fix-write-stream-open-final branch from c0ba9a2 to f341a47 Compare October 11, 2019 13:54
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ronag commented Oct 11, 2019

amended commit msg

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LGTM

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CI: https://ci.nodejs.org/job/node-test-pull-request/25958/

@Trott Trott added this to the 13.0.0 milestone Oct 11, 2019
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Trott commented Oct 12, 2019

CITGM: https://ci.nodejs.org/view/Node.js-citgm/job/citgm-smoker/2049/

CITGM results look great. No multer failures anymore and no new unexpected failures.

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nodejs-github-bot commented Oct 12, 2019 •
edited by Trott
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CI: https://ci.nodejs.org/job/node-test-pull-request/25979/ ✔️

Trott pushed a commit that referenced this pull request Oct 13, 2019
@ronag @Trott
fs: do not emit 'finish' before 'open' on write empty file
ba45367 
'finish' could previously be emitted before the file has been
created when ending a write stream without having written any
data.

Refs: expressjs/multer#238

PR-URL: #29930
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
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Trott commented Oct 13, 2019

Landed in ba45367. Thanks!

@Trott Trott closed this Oct 13, 2019
@Trott Trott mentioned this pull request Oct 15, 2019
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targos pushed a commit that referenced this pull request Oct 18, 2019
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fs: do not emit 'finish' before 'open' on write empty file
8ebc945 
'finish' could previously be emitted before the file has been
created when ending a write stream without having written any
data.

Refs: expressjs/multer#238

PR-URL: #29930
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
@BethGriggs BethGriggs mentioned this pull request Oct 21, 2019
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It looks like this may be causing some test failures in userland: see sindresorhus/copy-file#38

https://travis-ci.org/sindresorhus/cp-file/jobs/602461047#L280

In this case, errno is undefined whereas before it was -5.

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previously the first error emitted from the fs readable stream was EIO; now it's ERR_STREAM_WRITE_AFTER_END. going to guess that's because the latter now comes out of "open" and the former out of "finish"

given this test is doing some monkeypatching in its harness, we can probably just work around that, but wanted to make sure this was intended?

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ronag commented Oct 24, 2019

@boneskull: I'm not sure I'm following. Can you provide a simple example?

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@ronag I can't really, as it's not my code and I don't really understand the intent. But I can tell you that previous to Node.js v12.13.0, the first error emitted from a writable stream in this test case was one w/ code EIO; and now it's one with ERR_STREAM_WRITE_AFTER_END.

https://github.com/sindresorhus/cp-file/blob/master/test/async.js#L244

@boneskull boneskull mentioned this pull request Oct 24, 2019
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@boneskull would you mind opening a new issue in this repo? Would you mind confirming that Node 12.12.0 was working as expected.

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@lpinca lpinca lpinca approved these changes

@Fishrock123 Fishrock123 Fishrock123 approved these changes

@addaleax addaleax addaleax approved these changes

@Trott Trott Trott approved these changes

@mcollina mcollina mcollina approved these changes

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