Bug 194319 – Web Inspector: "Worker not found" uncaught protocol errors

• Component: Web Inspector
• Status: RESOLVED FIXED

[Joseph Pecoraro]

"Worker not found" uncaught protocol errors

Steps to Reproduce:
1. Inspect maps.google.com
2. Reload a few times
  => Errors, Worker was created+terminated in the backend before frontend could send messages, okay to not find the worker.

Steps to Reproduce:
1. Inspect maps.google.com
2. Cross origin navigate to a page without workers
  => Potential Errors, leftover worker targets in WI.targets

[Joseph Pecoraro]

Created attachment 361248 [details]
[PATCH] Proposed Fix

[Matt Baker]

Comment on attachment 361248 [details]
[PATCH] Proposed Fix

View in context: https://bugs.webkit.org/attachment.cgi?id=361248&action=review

r=me

> Source/WebInspectorUI/ChangeLog:12
> +        frame, but for now this is the only a page transition can kill

Grammar: "the only a page" -> "the only way a page"

> Source/WebInspectorUI/UserInterface/Base/Main.js:232
> +    let workerTargets = WI.targets.filter((x) => x.type === WI.Target.Type.Worker);

Nit: rename x to target.

[Joseph Pecoraro]

(In reply to Matt Baker from comment #2)
> Comment on attachment 361248 [details]
> [PATCH] Proposed Fix
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=361248&action=review
> 
> r=me
> 
> > Source/WebInspectorUI/ChangeLog:12
> > +        frame, but for now this is the only a page transition can kill
> 
> Grammar: "the only a page" -> "the only way a page"

Doh! Thanks

> > Source/WebInspectorUI/UserInterface/Base/Main.js:232
> > +    let workerTargets = WI.targets.filter((x) => x.type === WI.Target.Type.Worker);
> 
> Nit: rename x to target.

There is already a target I don't want to shadow, and I think it is clear from context.

[Devin Rousso]

Comment on attachment 361248 [details]
[PATCH] Proposed Fix

View in context: https://bugs.webkit.org/attachment.cgi?id=361248&action=review

>> Source/WebInspectorUI/ChangeLog:12
>> +        frame, but for now this is the only a page transition can kill
> 
> Grammar: "the only a page" -> "the only way a page"

err, I think he means "but for now only a page transition can kill all worker targets."

>> Source/WebInspectorUI/UserInterface/Base/Main.js:232
>> +    let workerTargets = WI.targets.filter((x) => x.type === WI.Target.Type.Worker);
> 
> Nit: rename x to target.

We don't want to use `target` since that already exists in this function.  I think `item` is a better/clearer name.

> Source/WebInspectorUI/UserInterface/Controllers/WorkerManager.js:58
> +        WorkerAgent.initialized(workerId).catch(function(){});

Rather than just silently handling failure, maybe we can do an engineering-build-only log?  Like a `console.assert(false, ...);`?

> Source/WebInspectorUI/UserInterface/Protocol/Connection.js:311
> +        // Ignore errors if a worker went away quickly.

We should also have this comment in WorkerManager.js.

> Source/WebInspectorUI/UserInterface/Protocol/Connection.js:312
> +        WorkerAgent.sendMessageToWorker(this._workerId, message).catch(function(){});

Ditto (>WorkerManager.js:58).

[Joseph Pecoraro]

> > Source/WebInspectorUI/UserInterface/Controllers/WorkerManager.js:58
> > +        WorkerAgent.initialized(workerId).catch(function(){});
> 
> Rather than just silently handling failure, maybe we can do an
> engineering-build-only log?  Like a `console.assert(false, ...);`?

I don't want to assert(false) for something we know can and will happen. Jus loading maps.google.com for example.

[Joseph Pecoraro]

Created attachment 361308 [details]
[PATCH] For Landing

[WebKit Commit Bot]

Comment on attachment 361308 [details]
[PATCH] For Landing

Clearing flags on attachment: 361308

Committed r241039: <https://trac.webkit.org/changeset/241039>

[Radar WebKit Bug Importer]

<rdar://problem/47860997>