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fs: make sure to write entire buffer #49211

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atlowChemi
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fs.write(v) is not guaranteed to write everything in a single
call. Make sure we don't assume so.

Refs: #42434 (comment)

@nodejs-github-bot nodejs-github-bot added fs Issues and PRs related to the fs subsystem / file system. needs-ci PRs that need a full CI run. labels Aug 17, 2023
anonrig
anonrig reviewed Aug 17, 2023
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benchmark output:

                                                                                              confidence improvement accuracy (*)    (**)   (***)
fs/write-stream-throughput.js size=1024 encodingType='asc' dur=5                                             -0.97 %       ±2.40%  ±3.19%  ±4.15%
fs/write-stream-throughput.js size=1024 encodingType='buf' dur=5                                              0.81 %       ±1.53%  ±2.03%  ±2.65%
fs/write-stream-throughput.js size=1024 encodingType='utf' dur=5                                              1.61 %       ±1.75%  ±2.33%  ±3.06%
fs/write-stream-throughput.js size=1048576 encodingType='asc' dur=5                                           0.09 %       ±2.32%  ±3.09%  ±4.02%
fs/write-stream-throughput.js size=1048576 encodingType='buf' dur=5                                          -0.38 %       ±0.60%  ±0.80%  ±1.03%
fs/write-stream-throughput.js size=1048576 encodingType='utf' dur=5                                          -0.38 %       ±1.50%  ±1.99%  ±2.60%
fs/write-stream-throughput.js size=2 encodingType='asc' dur=5                                                -0.31 %       ±2.03%  ±2.71%  ±3.53%
fs/write-stream-throughput.js size=2 encodingType='buf' dur=5                                                -0.53 %       ±1.74%  ±2.32%  ±3.02%
fs/write-stream-throughput.js size=2 encodingType='utf' dur=5                                                -0.13 %       ±2.22%  ±2.96%  ±3.85%
fs/write-stream-throughput.js size=65535 encodingType='asc' dur=5                                     **     -1.64 %       ±1.05%  ±1.40%  ±1.85%
fs/write-stream-throughput.js size=65535 encodingType='buf' dur=5                                             0.09 %       ±1.02%  ±1.37%  ±1.80%
fs/write-stream-throughput.js size=65535 encodingType='utf' dur=5                                             0.06 %       ±1.18%  ±1.57%  ±2.04%


Be aware that when doing many comparisons the risk of a false-positive
result increases. In this case, there are 142 comparisons, you can thus
expect the following amount of false-positive results:
  7.10 false positives, when considering a   5% risk acceptance (*, **, ***),
  1.42 false positives, when considering a   1% risk acceptance (**, ***),
  0.14 false positives, when considering a 0.1% risk acceptance (***)

ronag
ronag reviewed Aug 21, 2023
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Existing tests pass and it's quite tricky make tests for this. You probably need to pass a custom "fs" implementation into the stream which will return EAGAIN.

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CI: https://ci.nodejs.org/job/node-test-pull-request/53493/

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CI: https://ci.nodejs.org/job/node-test-pull-request/53497/

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CI: https://ci.nodejs.org/job/node-test-pull-request/53504/

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ronag
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@atlowChemi atlowChemi force-pushed the write-all branch 2 times, most recently from 2c9b7e0 to 20d51d2 Compare August 23, 2023 13:44
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@atlowChemi atlowChemi added author ready PRs that have at least one approval, no pending requests for changes, and a CI started. commit-queue-squash Add this label to instruct the Commit Queue to squash all the PR commits into the first one. labels Aug 24, 2023
atlowChemi added a commit to atlowChemi/node that referenced this pull request Aug 24, 2023
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fs: make sure to write entire buffer
feb5b0f 
fs.write(v) is not guaranteed to write everything in a single
call. Make sure we don't assume so.

PR-URL: nodejs#49211
Co-authored-by: Chemi Atlow <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Robert Nagy <[email protected]>
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Landed in feb5b0f

@atlowChemi atlowChemi closed this Aug 24, 2023
@atlowChemi atlowChemi deleted the write-all branch August 24, 2023 05:36
This was referenced Aug 25, 2023
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UlisesGascon pushed a commit that referenced this pull request Sep 10, 2023
@ronag @atlowChemi @UlisesGascon
fs: make sure to write entire buffer
88ba79b 
fs.write(v) is not guaranteed to write everything in a single
call. Make sure we don't assume so.

PR-URL: #49211
Co-authored-by: Chemi Atlow <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Robert Nagy <[email protected]>
@UlisesGascon UlisesGascon mentioned this pull request Sep 10, 2023
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@aduh95 aduh95 mentioned this pull request Sep 20, 2023
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richardlau pushed a commit that referenced this pull request Sep 28, 2023
@ronag @atlowChemi @richardlau
fs: make sure to write entire buffer
7a3e1ff 
fs.write(v) is not guaranteed to write everything in a single
call. Make sure we don't assume so.

PR-URL: #49211
Co-authored-by: Chemi Atlow <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Robert Nagy <[email protected]>
This was referenced Oct 6, 2023
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alexfernandez pushed a commit to alexfernandez/node that referenced this pull request Nov 1, 2023
@ronag @atlowChemi @alexfernandez
fs: make sure to write entire buffer
febb608 
fs.write(v) is not guaranteed to write everything in a single
call. Make sure we don't assume so.

PR-URL: nodejs#49211
Co-authored-by: Chemi Atlow <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Robert Nagy <[email protected]>
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@ronag ronag ronag approved these changes

@benjamingr benjamingr benjamingr approved these changes

@anonrig anonrig Awaiting requested review from anonrig

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