Response construction with a ReadableStream

third_party/WebKit/Source/modules/fetch/ReadableStreamDataConsumerHandle.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ReadableStreamDataConsumerHandle_h
+#define ReadableStreamDataConsumerHandle_h
+
+#include "modules/ModulesExport.h"
+#include "modules/fetch/FetchDataConsumerHandle.h"
+#include "wtf/Forward.h"
+#include "wtf/PassOwnPtr.h"
+#include "wtf/RefPtr.h"
+#include <v8.h>
+
+namespace blink {
+
+class ScriptState;
+
+// This class is a FetchDataConsumerHandle pulling bytes from ReadableStream
+// implemented with V8 Extras.
+// The stream will be immediately locked by the handle and will never be
+// released.
+// TODO(yhirano): CURRENTLY THIS HANDLE SUPPORTS READING ONLY FROM THE THREAD ON
+// WHICH IT IS CREATED. FIX THIS.
+// TODO(yhirano): This implementation may cause leaks because the handle and
+// the reader own a strong reference to the associated ReadableStreamReader.
+// Fix it.
+class MODULES_EXPORT ReadableStreamDataConsumerHandle final : public FetchDataConsumerHandle {
+    WTF_MAKE_NONCOPYABLE(ReadableStreamDataConsumerHandle);
+public:
+    static PassOwnPtr<ReadableStreamDataConsumerHandle> create(ScriptState* scriptState, v8::Local<v8::Value> stream)
+    {
+        return adoptPtr(new ReadableStreamDataConsumerHandle(scriptState, stream));
+    }
+    ~ReadableStreamDataConsumerHandle() override;
+
+private:
+    class ReadingContext;
+    ReadableStreamDataConsumerHandle(ScriptState*, v8::Local<v8::Value> stream);
+    Reader* obtainReaderInternal(Client*) override;
+    const char* debugName() const override { return "ReadableStreamDataConsumerHandle"; }
+
+    RefPtr<ReadingContext> m_readingContext;
+};
+
+} // namespace blink
+
+#endif // ReadableStreamDataConsumerHandle_h