run observatory from command line with web app

[Tomasz Kubacki]

Hi,

I tried to connect to observatory from cmd, so I've done following

1. generated new app with: stagehand web-simple

2. pub get

3. pub serve 

4. then - following instructions here https://www.dartlang.org/tools/observatory/get-started.html -  started observatory with:

 /usr/local/opt/dart/Chromium.app/Contents/MacOS/Chromium --DART_FLAGS="--steal_breakpoints --pause-isolates-on-start" http://localhost:8080

and got this output:

MacBook-Pro-Tomasz:simpleWebApp tomek$ /usr/local/opt/dart/Chromium.app/Contents/MacOS/Chromium --DART_FLAGS="--steal_breakpoints --pause-isolates-on-start" http://localhost:8080

[19274:1291:0809/183329:ERROR:renderer_main.cc(207)] Running without renderer sandbox

[19275:1291:0809/183329:ERROR:renderer_main.cc(207)] Running without renderer sandbox

Observatory listening on http://127.0.0.1:56065

Observatory listening on http://127.0.0.1:56068

[19279:1291:0809/183334:ERROR:renderer_main.cc(207)] Running without renderer sandbox

Observatory listening on http://127.0.0.1:56072

[19280:1291:0809/183336:ERROR:renderer_main.cc(207)] Running without renderer sandbox

Observatory listening on http://127.0.0.1:56078

First it's strange that Observatory seems to start twice (sic!). Observatory page states:

"Disconnected from VM: Connection saw corrupt JSON message: FormatException: SyntaxError: Unexpected number 

[Connect to a VM]"

Screenshot: http://ibin.co/2BZ6xo1JVk1a

My dart --version

Dart VM version: 1.11.3 (Mon Aug  3 04:37:15 2015) on "macos_x64"

Any idea why it's not starting ?

[Tomasz Kubacki]

Ok it seems above *is* working fine on linux - filled bug here: https://github.com/dart-lang/sdk/issues/24029

[John McCutchan]

Hi,

An Observatory is hosted for each Dart VM instance. When starting up, Dartium opens multiple tabs, resulting in multiple VM instances. 

A simpler way to use Observatory with Dartium is:

1) Launch Dartium without any command line flags.

2) Navigate a tab to your Dart app.

3) Open up DevTools and you'll see the URL for the Observatory for this tab.

HTH,

John

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[Tomasz Kubacki]

John,

Thanks for your reply.

I followed your instructions but stil can't connect to app vm and got:

Disconnected from VM: Connection saw corrupt JSON message: FormatException: SyntaxError: Unexpected number 

[Connect to a VM]

Is there any way I can dig deeper ?

cheers,

t.k

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[John Mccutchan]

Hi,

I have just tested 1.12.0-dev5.2 macos_ia32 locally with a Box2D web application. Everything worked when I did the following:

0) $ pub serve

1) $ dartium --DART_FLAGS="--steal_breakpoints --pause-isolates-on-start"

2) Navigate to localhost:8080

3) Open up DevTools

4) Click the Observatory link.

I tried the CPU profile and everything looked good.

Without a reproducible using the latest dev channel release I can't do much more.

Thanks,

John

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