> On 03-Aug-2016, at 3:48 PM, Ben Noordhuis <i...@bnoordhuis.nl> wrote:
>
> On Wed, Aug 3, 2016 at 11:40 AM, Abhishek Singh
> <singhabhishek....@gmail.com> wrote:
>> Hi Ben,
>>
>> Apologies for not providing the background. I’m trying to leverage C++ API
>> to drive V8 JSON debugger for embedded V8 use case, not sure if leveraging
>> JS API to drive debugger would be of utility in this situation. Here is high
>> level workflow pipeline for this use case:
>>
>> * There is a Golang server that listens on some sockets and receives
>> json/base64 encoded docs
>> * Golang guy pipelines the docs to CGO to embedded C++ V8
>> implementation(primarily extending some functionalities that JS provides by
>> default).
>> * Golang server gets http calls encapsulating different JSON based V8
>> debugger request commands and(CGO <-> V8 communication happens) accordingly
>> execution of user supplied code to be executed by embedded v8 needs to
>> pause/continue etc
>>
>> =========
>>
>> Based on this use case, I very likely need to leverage
>> v8::Debug::SetMessageHandler and v8::Debug::SendCommand apis to handle user
>> requests to enforce breakpoints/continue/evaluate etc. So I was hoping if
>> anyone could share sample standalone code on top of C++ V8 debugger api(if
>> they have it lying somewhere around).
>
> In that case perhaps you can look at test/cctest/test-debug.cc for
> inspiration?
>
Yeah, I referred to it for initial implementation - at least I’m getting
response codes to requests properly. I’ll tell you current problem I’ve:
* I’m asked V8 to setup breakpoint(line#2 column#0) on using JSON protocol and
I got success message as response -
{"seq":1,"request_seq":579,"type":"response","command":"setbreakpoint","success":true,"body":{"type":"scriptId","breakpoint":1,"script_id":37,"line":2,"column":0,"actual_locations":[{"line":3,"column":2,"script_id":37}]},"refs":[],"running":true}
Function against which this BP has seen setup looks something like this:
1 function OnUpdate(doc, meta) {
2 log(meta.key);
3 if (meta.type === “json”) {
4 log(doc);
5 }
6 }
* Given that set breakpoint call returned success, I was expecting OnUpdate()
function to pause execution at the breakpoint when function is called
next(until I fire continue call). But what I observe “OnUpdate” continues
business as usual i.e. as if no BP has been set.
Not sure what exactly I’m missing here. I suppose I might need to AssignContext
like it’s done in node[0] and probably fetch the Context under which debug
commands were setup inside MessageHandler[1]
[0]https://github.com/nodejs/node/blob/master/src/debug-agent.cc#L122-L123
[1]https://github.com/nodejs/node/blob/master/src/debug-agent.cc#L315-L318
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