cluster: support windowsHide option for workers #17412

toddwong · 2017-12-01T03:36:26Z

Fixes: #17370

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

Affected core subsystem(s)

cluster

bnoordhuis

LGTM with a couple of comments about the test.

bnoordhuis · 2017-12-01T10:18:15Z

test/parallel/test-cluster-fork-windowsHide.js

+    assert.strictEqual(signal, null);
+  }));
+
+  cstdout.on('data', (data) => {


Call cstdout.setEncoding('utf8'), then you don't have to .toString('utf8') below.

Yeah, you are right, cstdout.setEncoding('utf8') make more sense here. Just deal too much binary data these days :D .

bnoordhuis · 2017-12-01T10:19:00Z

test/parallel/test-cluster-fork-windowsHide.js

+      worker.disconnect();
+    }
+  });
+  cstdin.write(msg, 'utf8');


You don't have to specify 'utf8' if you're writing a string, that's the default encoding.

I wasn't aware of that...

bnoordhuis · 2017-12-01T10:19:20Z

test/parallel/test-cluster-fork-windowsHide.js

+    process.stdout.write(data);
+  });
+  process.on('disconnect', function() {
+    process.stdin.pause();


Can you explain why you call .pause() here?

The stdin keeps the worker from exiting. That's the only way I know to get rid of it.

mscdex · 2017-12-01T12:47:45Z

Shouldn't the test actually check that the console window doesn't exist somehow (e.g. using Powershell)?

mscdex · 2017-12-01T12:48:25Z

Also, the test could probably be skipped on non-Windows platforms.

bnoordhuis · 2017-12-01T13:13:04Z

I'd say it's good to test that windowsHide doesn't have an adverse effect on other platforms.

cjihrig · 2017-12-01T13:32:53Z

test/parallel/test-cluster-fork-windowsHide.js

+  process.stdin.on('data', (data) => {
+    process.stdout.write(data);
+  });
+  process.on('disconnect', function() {


It doesn't really matter, just curious why you used a function here but arrow functions everywhere else.

My bad. A little careless. I wasn't expecting the stdin would block the process from exiting at the beginning, and put the disconnect handler a little later, and not notice the coding style difference.

toddwong · 2017-12-01T13:34:19Z

@mscdex I must confess that this test is just for "formally"(sorry about my English, can't find a proper word...) completeness according to the PR requirements (tests and/or benchmarks are included).

Actually, I don't know how to automatically test it at all, and very interested in advises.

@bnoordhuis So my test actually useful I think.

PS: Thanks for reviewing.

toddwong · 2017-12-01T16:11:50Z

Just polished the test code a little bit according to the above reviews

bnoordhuis

LGTM, thanks. CI: https://ci.nodejs.org/job/node-test-pull-request/11845/

If there is a way to test with PS that the windows aren't actually created that would be even more awesome, but I have no idea how you'd test that.

toddwong · 2017-12-02T08:44:09Z

@bnoordhuis Just checked "test/parallel/test-child-process-windows-hide.js" and got some inspiration. See the commit 242d80c .

The idea is that, we just make sure the windowsHide option is passed to the underlying child_process.fork function correctly. And child_process.fork will make sure it passed to libuv finally. And libuv may do the real test for us (Not sure if/how it does, though).

bnoordhuis · 2017-12-02T12:34:52Z

What @mscdex was getting at is using some powershell-fu to check if the worker has a console window associated with it. I'm by no means a PS guru but I expect it would look something like this:

const output = child_process.execSync(
    `powershell -ExecutionPolicy Unrestricted -NoProfile  -c ` +
    `"Get-Process -Id ${worker.process.pid} | where ..."`)
    .toString('utf8');

Where ... checks if the Process object has a window associated with it or not. I don't know what the right property is but, given the plethora of Process properties, there must be one.

bnoordhuis · 2017-12-02T12:36:40Z

And libuv may do the real test for us (Not sure if/how it does, though).

No, libuv just passes it on to the OS.

toddwong · 2017-12-02T13:17:14Z

@bnoordhuis Just checked, there is a MainWindowHandle property. But there is another problem, the console windows won't be there for service processes even if they are spawned with windowsHide: false. Not sure if the CI runs as a service or not.

bnoordhuis · 2017-12-02T13:41:31Z

I'm reasonably sure the CI runs tests as a regular process and user.

Fixes: nodejs#17370

toddwong · 2017-12-02T16:09:46Z

@bnoordhuis @mscdex Added the fancy PowerShell thing! 😃

mscdex · 2017-12-02T17:09:35Z

test/parallel/test-cluster-fork-windowsHide.js

+    process.send({ type: 'workerOnline' });
+
+    let output = '0';
+    if (process.platform === 'win32')


Braces please for multi-line bodies.

bnoordhuis

One suggestion, otherwise nice work.

bnoordhuis · 2017-12-03T10:31:10Z

test/parallel/test-cluster-fork-windowsHide.js

+
+let patchedFork = child_process.fork;
+child_process.fork = (...args) => patchedFork.apply(this, args);
+const cluster = require('cluster');


You can get rid of the monkey-patch now because ultimately it doesn't how matter how the option is passed down, as long as the observable effect is the same.

Presumably the child_process.spawn() call can go too? I admit I don't quite understand why you run the tests in a child process.

I keep the monkey-patch just in case some one run the tests on other platforms or in a windows service session. Not sure if this is necessary or practically useful.

It seems Windows only allocate a new console window for an attaching process spawned by a detached process.

If process D is spawned by process C with detached: true , and process W is spawned by process D with detached: false, W will get a new black console window popped up.

if D is spawned by C with detached: false or W is spawned by D with detached: true, no console window will pop up for W.

C = Command, D = Daemon, W = worker, practically.

That's why the test need to be run in a (detached) child process.

@bnoordhuis Is this OK?

I keep the monkey-patch just in case some one run the tests on other platforms or in a windows service session. Not sure if this is necessary or practically useful.

Neither, I'd say. :-)

Can you add a comment to the test that explains why it spawns a child process first? I get it now from your explanation but it's not obvious from just looking at the code.

Sure, i'll add the comment, and remove the monkey-patch thing.

BridgeAR · 2017-12-12T22:26:49Z

@mscdex @bnoordhuis @cjihrig would you mind to take another look? It seems like all comments got addressed.

toddwong · 2017-12-14T03:50:46Z

Thanks, guys. Sorry I forgot leave a message for the last commit.

toddwong · 2017-12-29T02:01:54Z

Hi, guys,

It's been a while. Would this be landed any soon?

bnoordhuis · 2017-12-29T12:03:17Z

Sorry for the delay. New CI because the old one is inaccessible and I've added the 'ready' label.

https://ci.nodejs.org/job/node-test-commit/15130/

toddwong · 2018-01-05T11:15:41Z

Thanks!

Fixes: #17370 PR-URL: #17412 Fixes: #17370 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: James M Snell <jasnell@gmail.com>

MylesBorins · 2018-01-24T09:22:03Z

Should this have been semver minor?

Refs: nodejs#17412

PR-URL: #19578 Refs: #17412 Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

Fixes: #17370 PR-URL: #17412 Fixes: #17370 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #19578 Refs: #17412 Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

Fixes: #17370 PR-URL: #17412 Fixes: #17370 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #19578 Refs: #17412 Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

Notable Changes: * async_hooks: - rename PromiseWrap.parentId (Ali Ijaz Sheikh) #18633 - remove runtime deprecation (Ali Ijaz Sheikh) #19517 - deprecate unsafe emit{Before,After} (Ali Ijaz Sheikh) #18513 * cluster: - add cwd to cluster.settings (cjihrig) #18399 - support windowsHide option for workers (Todd Wong) #17412 * crypto: - allow passing null as IV unless required (Tobias Nießen) #18644 * deps: - upgrade npm to 6.2.0 (Kat Marchán) #21592 - upgrade libuv to 1.19.2 (cjihrig) #18918 - Upgrade node-inspect to 1.11.5 (Jan Krems) #21055 * fs,net: - support as and as+ flags in stringToFlags() (Sarat Addepalli) #18801 - emit 'ready' for fs streams and sockets (Sameer Srivastava) #19408 * http, http2: - add options to http.createServer() (Peter Marton) #15752 - add 103 Early Hints status code (Yosuke Furukawa) #16644 - add http fallback options to .createServer (Peter Marton) #15752 * n-api: - take n-api out of experimental (Michael Dawson) #19262 * perf_hooks: - add warning when too many entries in the timeline (James M Snell) #18087 * src: - add public API for managing NodePlatform (Cheng Zhao) #16981 - allow --perf-(basic-)?prof in NODE\_OPTIONS (Leko) #17600 - node internals' postmortem metadata (Matheus Marchini) #14901 * tls: - expose Finished messages in TLSSocket (Anton Salikhmetov) #19102 * **trace_events**: - add file pattern cli option (Andreas Madsen) #18480 * util: - implement util.getSystemErrorName() (Joyee Cheung) #18186 PR-URL: #21593

Notable Changes: * async_hooks: - rename PromiseWrap.parentId (Ali Ijaz Sheikh) nodejs#18633 - remove runtime deprecation (Ali Ijaz Sheikh) nodejs#19517 - deprecate unsafe emit{Before,After} (Ali Ijaz Sheikh) nodejs#18513 * cluster: - add cwd to cluster.settings (cjihrig) nodejs#18399 - support windowsHide option for workers (Todd Wong) nodejs#17412 * crypto: - allow passing null as IV unless required (Tobias Nießen) nodejs#18644 * deps: - upgrade npm to 6.2.0 (Kat Marchán) nodejs#21592 - upgrade libuv to 1.19.2 (cjihrig) nodejs#18918 - Upgrade node-inspect to 1.11.5 (Jan Krems) nodejs#21055 * fs,net: - support as and as+ flags in stringToFlags() (Sarat Addepalli) nodejs#18801 - emit 'ready' for fs streams and sockets (Sameer Srivastava) nodejs#19408 * http, http2: - add options to http.createServer() (Peter Marton) nodejs#15752 - add 103 Early Hints status code (Yosuke Furukawa) nodejs#16644 - add http fallback options to .createServer (Peter Marton) nodejs#15752 * n-api: - take n-api out of experimental (Michael Dawson) nodejs#19262 * perf_hooks: - add warning when too many entries in the timeline (James M Snell) nodejs#18087 * src: - add public API for managing NodePlatform (Cheng Zhao) nodejs#16981 - allow --perf-(basic-)?prof in NODE\_OPTIONS (Leko) nodejs#17600 - node internals' postmortem metadata (Matheus Marchini) nodejs#14901 * tls: - expose Finished messages in TLSSocket (Anton Salikhmetov) nodejs#19102 * **trace_events**: - add file pattern cli option (Andreas Madsen) nodejs#18480 * util: - implement util.getSystemErrorName() (Joyee Cheung) nodejs#18186 PR-URL: nodejs#21593

Notable Changes: * async_hooks: - rename PromiseWrap.parentId (Ali Ijaz Sheikh) #18633 - remove runtime deprecation (Ali Ijaz Sheikh) #19517 - deprecate unsafe emit{Before,After} (Ali Ijaz Sheikh) #18513 * cluster: - add cwd to cluster.settings (cjihrig) #18399 - support windowsHide option for workers (Todd Wong) #17412 * crypto: - allow passing null as IV unless required (Tobias Nießen) #18644 * deps: - upgrade npm to 6.4.1 (Kat Marchán) #22591 - upgrade libuv to 1.19.2 (cjihrig) #18918 - Upgrade node-inspect to 1.11.5 (Jan Krems) #21055 * fs,net: - support as and as+ flags in stringToFlags() (Sarat Addepalli) #18801 - emit 'ready' for fs streams and sockets (Sameer Srivastava) #19408 * http, http2: - add options to http.createServer() (Peter Marton) #15752 - add 103 Early Hints status code (Yosuke Furukawa) #16644 - add http fallback options to .createServer (Peter Marton) #15752 * n-api: - take n-api out of experimental (Michael Dawson) #19262 * perf_hooks: - add warning when too many entries in the timeline (James M Snell) #18087 * src: - add public API for managing NodePlatform (Cheng Zhao) #16981 - allow --perf-(basic-)?prof in NODE\_OPTIONS (Leko) #17600 - node internals' postmortem metadata (Matheus Marchini) #14901 * tls: - expose Finished messages in TLSSocket (Anton Salikhmetov) #19102 * **trace_events**: - add file pattern cli option (Andreas Madsen) #18480 * util: - implement util.getSystemErrorName() (Joyee Cheung) #18186 PR-URL: #21593

Notable Changes: * async_hooks: - rename PromiseWrap.parentId (Ali Ijaz Sheikh) #18633 - remove runtime deprecation (Ali Ijaz Sheikh) #19517 - deprecate unsafe emit{Before,After} (Ali Ijaz Sheikh) #18513 * cluster: - add cwd to cluster.settings (cjihrig) #18399 - support windowsHide option for workers (Todd Wong) #17412 * crypto: - allow passing null as IV unless required (Tobias Nießen) #18644 * deps: - upgrade npm to 6.2.0 (Kat Marchán) #21592 - upgrade libuv to 1.19.2 (cjihrig) #18918 - Upgrade node-inspect to 1.11.5 (Jan Krems) #21055 * fs,net: - support as and as+ flags in stringToFlags() (Sarat Addepalli) #18801 - emit 'ready' for fs streams and sockets (Sameer Srivastava) #19408 * http, http2: - add options to http.createServer() (Peter Marton) #15752 - add 103 Early Hints status code (Yosuke Furukawa) #16644 - add http fallback options to .createServer (Peter Marton) #15752 * n-api: - take n-api out of experimental (Michael Dawson) #19262 * perf_hooks: - add warning when too many entries in the timeline (James M Snell) #18087 * src: - add public API for managing NodePlatform (Cheng Zhao) #16981 - allow --perf-(basic-)?prof in NODE\_OPTIONS (Leko) #17600 - node internals' postmortem metadata (Matheus Marchini) #14901 * tls: - expose Finished messages in TLSSocket (Anton Salikhmetov) #19102 * **trace_events**: - add file pattern cli option (Andreas Madsen) #18480 * util: - implement util.getSystemErrorName() (Joyee Cheung) #18186 PR-URL: #21593

nodejs-github-bot added the cluster Issues and PRs related to the cluster subsystem. label Dec 1, 2017

bnoordhuis approved these changes Dec 1, 2017

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cjihrig approved these changes Dec 1, 2017

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toddwong force-pushed the hwcicf branch from 4e07b0e to 0b9373a Compare December 1, 2017 16:09

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cluster: support windowsHide option for workers

45134fb

Fixes: nodejs#17370

toddwong force-pushed the hwcicf branch from d4e3f43 to 45134fb Compare December 2, 2017 16:06

mscdex reviewed Dec 2, 2017

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fixup! cluster: support windowsHide option for workers

e8d752e

bnoordhuis reviewed Dec 3, 2017

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MylesBorins force-pushed the master branch from b7405ab to 7f086dd Compare December 8, 2017 16:37

fixup! cluster: support windowsHide option for workers

cc4081a

BridgeAR approved these changes Dec 12, 2017

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jasnell approved these changes Dec 12, 2017

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bnoordhuis added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Dec 29, 2017

BridgeAR closed this Jan 5, 2018

MylesBorins mentioned this pull request Jan 10, 2018

v9.4.0 proposal #18069

Merged

TimothyGu removed the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Jan 13, 2018

MylesBorins added the semver-minor PRs that contain new features and should be released in the next minor version. label Jan 24, 2018

tniessen added a commit to tniessen/node that referenced this pull request Mar 24, 2018

doc: add missing metadata for settings.windowsHide

82dcee3

Refs: nodejs#17412

tniessen mentioned this pull request Mar 24, 2018

doc: add missing metadata for cluster.settings.windowsHide #19578

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MylesBorins mentioned this pull request Aug 16, 2018

v8.12.0 proposal #21593

Merged

cluster: support windowsHide option for workers #17412

cluster: support windowsHide option for workers #17412

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toddwong commented Dec 1, 2017

Checklist

Affected core subsystem(s)

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