On Wed, Jul 15, 2015 at 2:17 AM, Jeff Waller <[email protected]> wrote:
> When dispatching from an asynchronous operation using C++, the function
> node::MakeCallback is
> supposed to automatically set the domain of the callback. So if method
> throws, then an event will
> be sent to the domain. At least that's the expectation. From the node
> source, it appears that recv
> is used to obtain the domain to which these events will posted
>
> NODE_EXTERN v8::Handle<v8::Value> MakeCallback(
>
> v8::Isolate* isolate,
>
> v8::Handle<v8::Object> recv,
>
> const char* method,
>
> int argc,
>
> v8::Handle<v8::Value>* argv);
>
>
>
>
> Local<Context> context = recv->CreationContext();
> Environment* env = Environment::GetCurrent(context);
>
> and then later
>
> if (env->using_domains())
>
> etc.
>
> What recv is and how's it's derived is a mystery. I can't find it
> documented. I've tried
> various values for recv: args.This(), Context()->Global(), the callback
> itself, etc. saved directly
> as a Persistent or saved as a object contained in a Persistent Array... all
> approaches fail. So
> here I am. If anyone knows what this object is or can suggest a next step,
> thanks in advance.
|recv| is the receiver object, the value of the |this| object inside
the function call.
If your code looks like this:
var addon = require('/path/to/addon.node');
var callback = function() { /* ... */ };
addon.makeCallback(callback);
Then args.This() equals |addon|, the native module object, and won't
normally have the .domain property that MakeCallback() looks for.
You can pass in the receiver explicitly and pass it on to MakeCallback:
var recv = { domain: process.domain, /* ... */ };
addon.makeCallback(recv, callback);
Or if you want |recv| to show up as args.This():
addon.makeCallback.call(recv, callback);
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