zlib: simplify flushing mechanism #23186
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CI: https://ci.nodejs.org/job/node-test-pull-request/17538/ (:heavy_check_mark:) I’d like to run CITGM on this once we’re back to a mostly normal state there – I’m not thinking this should be a breaking change, but I’d like to be extra-sure. Edit: Benchmark CI: https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/241/ |
jasnell
approved these changes
Oct 1, 2018
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Any other volunteers to review? :) |
addaleax
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Previously, flushing on zlib streams was implemented through
stream 'drain' handlers. This has a number of downsides; in
particular, it is complex, and could lead to unpredictable
behaviour, since it meant that in a sequence like
```js
compressor.write('abc');
compressor.flush();
waitForMoreDataAsynchronously(() => {
compressor.write('def');
});
```
it was not fully deterministic whether the flush happens after
the second chunk is written or the first one.
This commit replaces this mechanism by one that piggy-backs
along the stream’s write queue, using a “special” `Buffer`
instance that signals that a flush is currently due.
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CITGM results were full of compilation errors because I forgot to rebase… Again: https://ci.nodejs.org/view/Node.js-citgm/job/citgm-smoker/1576/ |
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Landed in e688fe6 |
addaleax
added a commit
that referenced
this pull request
Oct 9, 2018
Previously, flushing on zlib streams was implemented through
stream 'drain' handlers. This has a number of downsides; in
particular, it is complex, and could lead to unpredictable
behaviour, since it meant that in a sequence like
```js
compressor.write('abc');
compressor.flush();
waitForMoreDataAsynchronously(() => {
compressor.write('def');
});
```
it was not fully deterministic whether the flush happens after
the second chunk is written or the first one.
This commit replaces this mechanism by one that piggy-backs
along the stream’s write queue, using a “special” `Buffer`
instance that signals that a flush is currently due.
PR-URL: #23186
Reviewed-By: James M Snell <[email protected]>
targos
pushed a commit
that referenced
this pull request
Oct 10, 2018
Previously, flushing on zlib streams was implemented through
stream 'drain' handlers. This has a number of downsides; in
particular, it is complex, and could lead to unpredictable
behaviour, since it meant that in a sequence like
```js
compressor.write('abc');
compressor.flush();
waitForMoreDataAsynchronously(() => {
compressor.write('def');
});
```
it was not fully deterministic whether the flush happens after
the second chunk is written or the first one.
This commit replaces this mechanism by one that piggy-backs
along the stream’s write queue, using a “special” `Buffer`
instance that signals that a flush is currently due.
PR-URL: #23186
Reviewed-By: James M Snell <[email protected]>
This was referenced Oct 10, 2018
jasnell
pushed a commit
that referenced
this pull request
Oct 17, 2018
Previously, flushing on zlib streams was implemented through
stream 'drain' handlers. This has a number of downsides; in
particular, it is complex, and could lead to unpredictable
behaviour, since it meant that in a sequence like
```js
compressor.write('abc');
compressor.flush();
waitForMoreDataAsynchronously(() => {
compressor.write('def');
});
```
it was not fully deterministic whether the flush happens after
the second chunk is written or the first one.
This commit replaces this mechanism by one that piggy-backs
along the stream’s write queue, using a “special” `Buffer`
instance that signals that a flush is currently due.
PR-URL: #23186
Reviewed-By: James M Snell <[email protected]>
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Previously, flushing on zlib streams was implemented through stream 'drain' handlers. This has a number of downsides; in particular, it is complex, and could lead to unpredictable behaviour, since it meant that in a sequence like
it was not fully deterministic whether the flush happens after the second chunk is written or the first one.
This commit replaces this mechanism by one that piggy-backs along the stream’s write queue, using a “special”
Bufferinstance that signals that a flush is currently due.Checklist
make -j4 test(UNIX), orvcbuild test(Windows) passes