736046 - nsXMLHttpRequest::Send fails with mChannel being implemented in JS

Status: RESOLVED DUPLICATE of bug 682305

(Core :: DOM: Core & HTML, defect)

Description

[Alexandre Poirot [:ochameau]]

Attachment: Scratchpad test case

I was trying to implement a nsIChannel object in javascript and face the following platform bug.

The "end user" error looks like this:
$ request.send(null)
Component returned failure code: 0x80004005 (NS_ERROR_FAILURE)
nsresult: 0x80004005 (NS_ERROR_FAILURE)

It is being due to following code returning 2147500037 (NS_ERROR_FAILURE):
  rv = mChannel->AsyncOpen(listener, nsnull);
http://mxr.mozilla.org/mozilla-central/source/content/base/src/nsXMLHttpRequest.cpp#2833

Where `mChannel` is a xpcom object implemented in Javascript.

This error seems to be due to non-reflectiveness of nsXMLHttpRequest.
Following call dispatch an NS_ERROR_NO_INTERFACE error:
http://mxr.mozilla.org/mozilla-central/source/js/xpconnect/src/XPCWrappedNative.cpp#1986
1988     if (mScriptableInfo &&
1989         mScriptableInfo->GetFlags().ClassInfoInterfacesOnly() &&
1990         !mSet->HasInterface(aInterface) &&
1991         !mSet->HasInterfaceWithAncestor(aInterface)) {
1992         return NS_ERROR_NO_INTERFACE;
1993     }

Because nsXMLHttpRequest scriptable flags are set to:
64 #define DOM_DEFAULT_SCRIPTABLE_FLAGS                                       
65   (DEFAULT_SCRIPTABLE_FLAGS |                                              
66    nsIXPCScriptable::DONT_ENUM_QUERY_INTERFACE |                           
67    nsIXPCScriptable::CLASSINFO_INTERFACES_ONLY)


I attached a scratchpad test case that highlight this issue.
Unfortunatly I was not able to reduce it to less code, as I think we need to register a custom protocol in order to make XHR use a JS channel.

Comment 1

[Boris Zbarsky [:bzbarsky]]

This looks like a duplicate of bug 682305, right?

Comment 2

[Blake Kaplan (:mrbkap) (inactive)]

Oops, yeah.