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repl: handle null thrown #14306

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benjamingr
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@benjamingr benjamingr commented Jul 16, 2017 •
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  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines
Affected core subsystem(s)

repl

Fixes #12373

@nodejs-github-bot nodejs-github-bot added the repl Issues and PRs related to the REPL subsystem. label Jul 16, 2017
benjamingr
benjamingr commented Jul 16, 2017
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test/parallel/test-repl-sigint.js Outdated
@@ -35,6 +35,7 @@ child.stdout.once('data', common.mustCall(() => {

child.on('close', function(code) {
assert.strictEqual(code, 0);
console.log(stdout);
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whoops

@benjamingr benjamingr mentioned this pull request Jul 17, 2017
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TimothyGu
TimothyGu reviewed Jul 17, 2017
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lib/repl.js Outdated
if (isError && e.stack) {
top.outputStream.write(`${e.stack}\n`);
} else {
top.outputStream.write(`Error: ${e}\n`);
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Well, things that are thrown aren't necessarily always errors. Maybe Thrown: or just ${e}\n?

(Also does this work with symbols?)

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@TimothyGu I preferred to make the smaller changed - for it to work with symbols we'd need to wrap it in String (I can do that).

I can change the terminology from Error: to Thrown: I was hoping we could get a little bikeshedding on the message.

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Yeah well, this kinda goes back to #13784, which is still in limbo because of the lack of a good way to stringify an object.

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@TimothyGu yes, but I think String is a good middle ground - I don't want it to be bulletproof - I want it to be useful for users.

TimothyGu
TimothyGu reviewed Jul 17, 2017
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lib/repl.js Outdated
if (isError && e.stack) {
top.outputStream.write(`${e.stack}\n`);
} else {
top.outputStream.write(`Error: ${e}\n`);
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Yeah well, this kinda goes back to #13784, which is still in limbo because of the lack of a good way to stringify an object.

test/parallel/test-repl-null-thrown.js
input: process.stdin
});

replserver.emit('line', 'process.nextTick(() => { throw null; })');
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Is the process.nextTick necessary?

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@TimothyGu yes, to reproduce the issue - without the nextTick it doesn't crash the REPL.

repl: don't terminate on null thrown
4dfe7fd 
Previous behavior was to assume an error is a proper error in the
repl module. A check was added to not terminate the process on thrown
repl errors that are `null` or `undefined`.

PR-URL: nodejs#14306
Fixes: nodejs#12373
Reviewed-By: Anna Henningsen <anna@addaleax.net>
@benjamingr benjamingr force-pushed the repl-handle-null-thrown branch from 3200c5a to 4dfe7fd Compare July 17, 2017 08:18
@benjamingr
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@TimothyGu renamed "Error: " to "Thrown: " and handled thrown symbols.

TimothyGu
TimothyGu approved these changes Jul 17, 2017
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LGTM.

lib/repl.js
internalUtil.decorateErrorStack(e);
const isError = internalUtil.isError(e);
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Why not process.binding('util').isNativeError?

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@TimothyGu Not sure that's the behaviour I'd want - I'd like people to (optimally) be able to override Symbol.toStringTag (or even the name) and take the "Error like" path if they really need to.

I don't feel strongly about this though. If you do - let me know and I'll change it.

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Sounds good to me.

jasnell
jasnell reviewed Jul 17, 2017
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test/parallel/test-repl-null-thrown.js
replserver.emit('line', '.exit');

setTimeout(() => {
console.log(text);
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extraneous console.log() output?

Fishrock123
Fishrock123 approved these changes Jul 17, 2017
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CI: https://ci.nodejs.org/job/node-test-pull-request/9200/

cjihrig
cjihrig approved these changes Jul 17, 2017
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LGTM. I am curious why people aren't asking for all of the obnoxious scenarios from #12400 though :-D

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I mean, we can still craft weird scenarios with @@toStringTag, @@toPrimitive, valueOf, toString, stack, Proxys, etc. I know I've fallen into the traps of bikeshedding before (sorry @cjihrig), but this seems like as KISS of a threshold as any. And I guess the user deserves to get some weird error if they does one or more of those things.

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Landed in 380e814.

@TimothyGu TimothyGu closed this Jul 19, 2017
@benjamingr
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@TimothyGu note: you landed this without passing CI (last CI was failing due to changed error message). I've started a CI in https://ci.nodejs.org/job/node-test-pull-request/9246/console

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@benjamingr I didn't land this BTW, I just noticed it was landed w/o a "landed" comment.

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@TimothyGu I landed and immediately force reverted because of the CI (and posted in #node-dev) - currently waiting for CI to land this.

@benjamingr benjamingr reopened this Jul 19, 2017
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@benjamingr Ah oops. Sorry, should've let you handle this (and checked IRC...)

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ARM fanned failure on inspector/test-inspector-port-cluster unrelated.

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Landed in 030a028 🎉

@benjamingr benjamingr closed this Jul 19, 2017
benjamingr pushed a commit that referenced this pull request Jul 19, 2017
repl: don't terminate on null thrown
030a028 
Previous behavior was to assume an error is a proper error in the
repl module. A check was added to not terminate the process on thrown
repl errors that are `null` or `undefined`.

PR-URL: #14306
Fixes: #12373
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com
addaleax pushed a commit that referenced this pull request Jul 22, 2017
@addaleax
repl: don't terminate on null thrown
ef3139a 
Previous behavior was to assume an error is a proper error in the
repl module. A check was added to not terminate the process on thrown
repl errors that are `null` or `undefined`.

PR-URL: #14306
Fixes: #12373
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com
Fishrock123 pushed a commit that referenced this pull request Jul 24, 2017
@Fishrock123
repl: don't terminate on null thrown
34821f6 
Previous behavior was to assume an error is a proper error in the
repl module. A check was added to not terminate the process on thrown
repl errors that are `null` or `undefined`.

PR-URL: #14306
Fixes: #12373
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com
@addaleax addaleax mentioned this pull request Jul 24, 2017
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@addaleax addaleax mentioned this pull request Aug 2, 2017
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@MylesBorins
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Should this be backported to v6.x-staging? If yes please follow the guide and raise a backport PR, if no let me know or add the dont-land-on label.

@IonicaBizau IonicaBizau mentioned this pull request Oct 27, 2017
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ping @benjamingr

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ping @benjamingr

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@jasnell jasnell jasnell left review comments

@TimothyGu TimothyGu TimothyGu approved these changes

@addaleax addaleax addaleax approved these changes

@Fishrock123 Fishrock123 Fishrock123 approved these changes

@cjihrig cjihrig cjihrig approved these changes

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