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stream: cleanup use of _readableState.ended #29645

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stream: cleanup use of _readableState.ended #29645

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ckarande
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Replaces references to Readable stream's internal state
_readableState.ended with readableEnded.

One thing to highlight that readable stream internally (L#216)
sets the readableEnded property using _readableState.endEmitted and
not _readableState.ended. The files changed in this PR used
_readableState.ended state.

Although all existing tests pass and it seems correct to rely on the
_readableState.endEmitted to know when the stream ended, please
suggest if this could be a potential issue.

cc: @addaleax @mcollina

Refs: #445

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines

@nodejs-github-bot nodejs-github-bot added http2 Issues or PRs related to the http2 subsystem. net Issues and PRs related to the net subsystem. worker Issues and PRs related to Worker support. labels Sep 21, 2019
addaleax
addaleax previously approved these changes Sep 21, 2019
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One thing to highlight that readable stream internally (L#216)
sets the readableEnded property using _readableState.endEmitted and
not _readableState.ended. The files changed in this PR used
_readableState.ended state.

Although all existing tests pass and it seems correct to rely on the
_readableState.endEmitted to know when the stream ended, please
suggest if this could be a potential issue.

Does that mean that e.g. the .push(null) in the worker code can fail because .push(null) has already been called earlier, but the 'end' event just hasn’t been emitted yet?

@ckarande
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I don't this so. As per the readable stream current implementation, any subsequent .push(null) invocations after first .push(null) until the end event is emitted would have no impact on the state of the stream or cause any events or error.

addaleax
addaleax approved these changes Sep 21, 2019
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LGTM but I’d feel more comfortable if there was a test somewhere (whether it already exists or not) that makes sure that repeated .push(null) calls do not lead to errors :)

@ckarande
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Yes, makes sense. I will look for one if exists or add it as part of this PR if missing. Thanks.

@ckarande
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ckarande commented Sep 21, 2019 •
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I couldn't find an existing test verifying multiple .push(null) is safe. I just added one as part of this PR.

mcollina
mcollina approved these changes Sep 21, 2019
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LGTM

@trivikr trivikr added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Sep 21, 2019
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CI: https://ci.nodejs.org/job/node-test-pull-request/25626/

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danbev commented Sep 24, 2019

Landed in fed05cc, and e078e48.

@danbev danbev closed this Sep 24, 2019
danbev pushed a commit that referenced this pull request Sep 24, 2019
@ckarande @danbev
stream: cleanup use of internal ended state
fed05cc 
PR-URL: #29645
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
danbev pushed a commit that referenced this pull request Sep 24, 2019
@ckarande @danbev
stream: add test for multiple .push(null)
e078e48 
PR-URL: #29645
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
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mscdex commented Sep 24, 2019 •
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The subsystem prefix on the second commit should have been test instead of stream.

BridgeAR pushed a commit that referenced this pull request Sep 24, 2019
@ckarande @BridgeAR
stream: cleanup use of internal ended state
4f00ef5 
PR-URL: #29645
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
BridgeAR pushed a commit that referenced this pull request Sep 24, 2019
@ckarande @BridgeAR
stream: add test for multiple .push(null)
83fff25 
PR-URL: #29645
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
@BridgeAR BridgeAR mentioned this pull request Sep 24, 2019
Merged
BridgeAR pushed a commit that referenced this pull request Sep 25, 2019
@ckarande @BridgeAR
stream: cleanup use of internal ended state
b100897 
PR-URL: #29645
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
BridgeAR pushed a commit that referenced this pull request Sep 25, 2019
@ckarande @BridgeAR
stream: add test for multiple .push(null)
f016823 
PR-URL: #29645
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
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@mcollina mcollina mcollina approved these changes

@addaleax addaleax addaleax approved these changes

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@trivikr trivikr trivikr approved these changes

@ZYSzys ZYSzys ZYSzys approved these changes

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@ckarande @addaleax @nodejs-github-bot @danbev @mscdex @mcollina @BridgeAR @trivikr @ZYSzys