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code cleanup #19896

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code cleanup #19896

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vishal7201
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@vishal7201 vishal7201 commented Apr 9, 2018 •
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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 stream Issues and PRs related to the stream subsystem. label Apr 9, 2018
richardlau
richardlau reviewed Apr 9, 2018
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lib/_stream_readable.js Outdated
(state.needReadable ||
state.length < state.highWaterMark ||
state.length === 0);
(state.needReadable || state.length < state.highWaterMark);
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Can state.highWaterMark be 0? If so, < should probably be <=.

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this should be <=.

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We should probably add a test for this case.

@richardlau
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cc @nodejs/streams

@BridgeAR
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BridgeAR commented Apr 9, 2018

@vishal7201 seems like something went wrong when updating your PR. Would you mind to rebase? :-)

BridgeAR
BridgeAR reviewed Apr 10, 2018
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lib/_stream_readable.js Outdated
@@ -311,8 +311,7 @@ function chunkInvalid(state, chunk) {
// 'readable' event will be triggered.
function needMoreData(state) {
return !state.ended &&
(state.length < state.highWaterMark ||
state.length === 0);
(state.length < state.highWaterMark);
}
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Suggestion: this function could be inlined. It only has a single call site.

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Also needs to be <= as above

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@vishal7201 vishal7201 Apr 11, 2018 •
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with <= , a test case is failing AssertionError [ERR_ASSERTION]: true strictEqual false at Object.<anonymous> (node/test/parallel/test-stream2-objects.js:212:12)

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True, this is ok.

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can you remove the parenthesis? They are not needed anymore.

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can prob also be a one liner as this looks like it's <80 chars

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yes. I will do that

mcollina
mcollina approved these changes Apr 11, 2018
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LGTM

MoonBall
MoonBall reviewed Apr 12, 2018
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lib/_stream_readable.js
@@ -434,7 +432,7 @@ Readable.prototype.read = function(n) {
debug('need readable', doRead);

// if we currently have less than the highWaterMark, then also read some
if (state.length === 0 || state.length - n < state.highWaterMark) {
if (state.length - n < state.highWaterMark) {
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Please note that state.highWaterMark, state.length and n maybe equal 0. So if they all equal 0, state.length - n < state.highWaterMark doesn't equal to state.length === 0 || state.length - n < state.highWaterMark.

I suggest that this change would be with another PR because code cleaning shouldn't change code logic.

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Nice catch @MoonBall

@trivikr
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trivikr commented Apr 15, 2018

This appears to be a fix for #19893

@vishal7201:

kodemill added a commit to kodemill/node that referenced this pull request May 28, 2018
@kodemill
stream: inline needMoreData function
ee2cbec 
Inline the needMoreData function since it has only one call place.
Update the related comment.
Add a test for the edge case where HWM=0 and state.length=0.
Add a test for ReadableStream.read(n) method's edge case where
n, HWM and state.length are all zero.
This proves that there is no easy way to simplify the check at
https://github.com/nodejs/node/blob/master/lib/_stream_readable.js#L440

Fixes: nodejs#19893
Refs: nodejs#19896
@kodemill kodemill mentioned this pull request May 29, 2018
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mcollina pushed a commit that referenced this pull request Jun 2, 2018
@kodemill @mcollina
stream: inline needMoreData function
1c07ebf 
Inline the needMoreData function since it has only one call place.
Update the related comment.
Add a test for the edge case where HWM=0 and state.length=0.
Add a test for ReadableStream.read(n) method's edge case where
n, HWM and state.length are all zero.
This proves that there is no easy way to simplify the check at
https://github.com/nodejs/node/blob/master/lib/_stream_readable.js#L440

Fixes: #19893
Refs: #19896

PR-URL: #21009
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Lance Ball <lball@redhat.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
MylesBorins pushed a commit that referenced this pull request Jun 6, 2018
@kodemill @MylesBorins
stream: inline needMoreData function
44fe78b 
Inline the needMoreData function since it has only one call place.
Update the related comment.
Add a test for the edge case where HWM=0 and state.length=0.
Add a test for ReadableStream.read(n) method's edge case where
n, HWM and state.length are all zero.
This proves that there is no easy way to simplify the check at
https://github.com/nodejs/node/blob/master/lib/_stream_readable.js#L440

Fixes: #19893
Refs: #19896

PR-URL: #21009
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Lance Ball <lball@redhat.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
@apapirovski
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I'm going to close this out given that this has had no follow up in two months and there are issues with it, as expressed abbove. @vishal7201 please feel free to reopen if you would like to follow up on this!

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@mcollina mcollina mcollina approved these changes

@mafintosh mafintosh mafintosh left review comments

@richardlau richardlau richardlau left review comments

@BridgeAR BridgeAR BridgeAR left review comments

@MoonBall MoonBall MoonBall left review comments

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@vishal7201 @richardlau @BridgeAR @trivikr @apapirovski @mcollina @mafintosh @MoonBall @nodejs-github-bot