If I press F5 in Chrome nothing happens but this:
CDT: {"id":34,"method":"Page.reload","params":{"ignoreCache":false}}
V8: {"error":{"code":-32601,"message":"'Page.reload' wasn't found"},"id":34}
V8 does not seem to understand "Log.*", "Page.*", "Emulation.*",
"Rendering.*", "DOM.*", "CSS.*", etc. messages though we could write logic
to react accordingly to these kind of commands.
"Runtime.*", "Debugger.*" messages work when they are forwarded from CDT to
V8.
For example:
CDT: {"id":6,"method":"Runtime.enable"}
V8: {"id":6,"result":{}}
...
CDT:
{"id":25,"method":"Debugger.setBreakpointByUrl","params":{"lineNumber":0,"url":"1.js","columnNumber":0,"condition":""}}
V8:
{"id":25,"result":{"breakpointId":"1.js:0:0","locations":[{"scriptId":"26","lineNumber":0,"columnNumber":0}]}}
It looks Chrome never closes the WS connection (except when the inspector
tab itself is closed) and even the WS pings are sent.
In my application I do not have logic to close the WS connection (except
when my app quits) and I do not have WS reconnect logic either.
On Tuesday, 4 April 2017 07:08:05 UTC+1, Zac Hansen wrote:
>
> do you have it working if you connect with chrome then refresh chrome that
> it works?
>
> When I reconnect to the same embedded v8 app, I get a slightly different
> set of messages that don't properly set up the debugger the second time.
>
> Thanks.
>
>
> On Thursday, March 23, 2017 at 9:32:15 AM UTC-7, DánielN wrote:
>>
>> Eventually I managed to sort it out. It does not seem to have huge
>> interest about it but I share it anyway, someone might find it useful.
>> Basically we have to create a web socket server along with our VM that we
>> want to debug. Anything that comes through the ws connection (commands from
>> CDT) has to be forwarded to the InspectorClient
>> (v8_inspector::V8InspectorClient,
>> v8_inspector::V8InspectorSession::dispatchProtocolMessage method) and
>> anything (events and responses) that comes from the InspectorFrontend
>> (v8_inspector::V8Inspector::Channel) has to be sent through the ws
>> connection. We do not want to touch the JSON messages at all, no need for
>> parsing. We just forward them to CDT/V8. The tricky bit is the
>> runMessageLoopOnPause and quitMessageLoopOnPause methods. They have to be
>> overridden. runMessageLoopOnPause should not return and has to handle
>> messages until quitMessageLoopOnPause is called. That's it. In CDT we can
>> see the call stack, scripts, we set break points, whatever. Launch your
>> browser with --remote-debugging-port=2222 then type
>> http://localhost:2222/devtools/inspector.html?ws=localhost:2000
>> (localhost:2000 where the ws server listens) and you can start debugging
>> your v8 context.
>>
>> On Friday, 3 March 2017 09:41:44 UTC, DánielN wrote:
>>>
>>> I have just started exploring debugging. I am lifting code
>>> (InspectorClient, InspectorFrontend) from d8 to my test project. I would
>>> like to connect my embedded v8 VM to CDT and debug it. Does anyone have
>>> some simple example that does that? It seems to me to be a long way and a
>>> big learning curve from dismantling d8 code to connect to CDT.
>>> Any help would be very much appreciated.
>>>
>>> On Friday, 3 March 2017 09:21:43 UTC, Ben Noordhuis wrote:
>>>>
>>>> On Fri, Mar 3, 2017 at 10:10 AM, Rishi Kumar <[email protected]>
>>>> wrote:
>>>> > Hi,
>>>> >
>>>> > I was reading and using the debugging protocol from this page
>>>> > https://github.com/v8/v8/wiki/Debugging-Protocol . Its looks like it
>>>> has
>>>> > been removed from the github wiki. I dont know how to get that link
>>>> page to
>>>> > complete my work. I need these protocol documentation which was clear
>>>> and
>>>> > proper in that page link. is anyone can help me to get that ?
>>>>
>>>> This is the new API:
>>>> https://github.com/v8/v8/wiki/Debugging-over-the-V8-Inspector-API
>>>>
>>>> The old JSON-based protocol was deprecated two or three years ago and
>>>> was removed recently.
>>>>
>>>
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