Bug 1331862. Part 2 - add functions to collect debugging info asynchronously. r=kaku

MozReview-Commit-ID: 4btaZqUqyLn

--HG--
extra : rebase_source : 80289bb88f7359062575e2b7f7da06e00f78cd51
extra : source : 7e011787cb911799f47b55aeba986bf05c30ed27

dom/media/MediaDecoder.cpp

@@ -1755,6 +1755,27 @@ MediaDecoder::DumpDebugInfo()
   }
 }
 
+RefPtr<MediaDecoder::DebugInfoPromise>
+MediaDecoder::RequestDebugInfo()
+{
+  MOZ_DIAGNOSTIC_ASSERT(!IsShutdown());
+
+  auto str = GetDebugInfo();
+  if (!GetStateMachine()) {
+    return DebugInfoPromise::CreateAndResolve(str, __func__);
+  }
+
+  return GetStateMachine()->RequestDebugInfo()->Then(
+    AbstractThread::MainThread(), __func__,
+    [str] (const nsACString& aString) {
+      nsCString result = str + nsCString("\n") + aString;
+      return DebugInfoPromise::CreateAndResolve(result, __func__);
+    },
+    [str] () {
+      return DebugInfoPromise::CreateAndResolve(str, __func__);
+    });
+}
+
 void
 MediaDecoder::NotifyAudibleStateChanged()
 {

dom/media/MediaDecoder.h

@@ -477,6 +477,9 @@ private:
 
   virtual void DumpDebugInfo();
 
+  using DebugInfoPromise = MozPromise<nsCString, bool, true>;
+  RefPtr<DebugInfoPromise> RequestDebugInfo();
+
 protected:
   virtual ~MediaDecoder();
 

dom/media/MediaDecoderStateMachine.cpp

@@ -3683,6 +3683,17 @@ MediaDecoderStateMachine::DumpDebugInfo()
     AbstractThread::AssertDispatchSuccess, AbstractThread::TailDispatch);
 }
 
+RefPtr<MediaDecoder::DebugInfoPromise>
+MediaDecoderStateMachine::RequestDebugInfo()
+{
+  using PromiseType = MediaDecoder::DebugInfoPromise;
+  RefPtr<PromiseType::Private> p = new PromiseType::Private(__func__);
+  OwnerThread()->Dispatch(NS_NewRunnableFunction([this, p] () {
+    p->Resolve(GetDebugInfo(), __func__);
+  }), AbstractThread::AssertDispatchSuccess, AbstractThread::TailDispatch);
+  return p.forget();
+}
+
 void MediaDecoderStateMachine::AddOutputStream(ProcessedMediaStream* aStream,
                                                bool aFinishWhenEnded)
 {

dom/media/MediaDecoderStateMachine.h

@@ -162,6 +162,7 @@ public:
   };
 
   void DumpDebugInfo();
+  RefPtr<MediaDecoder::DebugInfoPromise> RequestDebugInfo();
 
   void AddOutputStream(ProcessedMediaStream* aStream, bool aFinishWhenEnded);
   // Remove an output stream added with AddOutputStream.