Make Response::body return v8-extra based stream behind flag

third_party/WebKit/Source/modules/fetch/Body.cpp

 // Copyright 2014 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.
 
 #include "modules/fetch/Body.h"
 
-#include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/V8ArrayBuffer.h"
 #include "bindings/core/v8/V8ThrowException.h"
 #include "core/dom/DOMArrayBuffer.h"
 #include "core/dom/DOMTypedArray.h"
 #include "core/fileapi/Blob.h"
 #include "core/frame/UseCounter.h"
-#include "core/streams/ReadableStreamController.h"
-#include "core/streams/ReadableStreamOperations.h"
-#include "core/streams/UnderlyingSourceBase.h"
 #include "modules/fetch/BodyStreamBuffer.h"
 #include "modules/fetch/FetchDataLoader.h"
 #include "public/platform/WebDataConsumerHandle.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 namespace {
@@ skipping 67 matching lines @@
         v8::Local<v8::String> inputString = v8String(isolate, string);
         v8::TryCatch trycatch(isolate);
         v8::Local<v8::Value> parsed;
         if (v8Call(v8::JSON::Parse(isolate, inputString), parsed, trycatch))
             resolver()->resolve(parsed);
         else
             resolver()->reject(trycatch.Exception());
     }
 };
 
-class UnderlyingSourceFromDataConsumerHandle final : public UnderlyingSourceBase, public WebDataConsumerHandle::Client {
-    EAGERLY_FINALIZE();
-    DECLARE_EAGER_FINALIZATION_OPERATOR_NEW();
-public:
-    UnderlyingSourceFromDataConsumerHandle(ScriptState* scriptState, PassOwnPtr<WebDataConsumerHandle> handle)
-        : UnderlyingSourceBase(scriptState)
-        , m_scriptState(scriptState)
-        , m_reader(handle->obtainReader(this))
-    {
-    }
-
-    ScriptPromise pull(ScriptState* scriptState) override
-    {
-        didGetReadable();
-        return ScriptPromise::castUndefined(scriptState);
-    }
-
-    ScriptPromise cancel(ScriptState* scriptState, ScriptValue reason) override
-    {
-        m_reader = nullptr;
-        return ScriptPromise::castUndefined(scriptState);
-    }
-
-    void didGetReadable() override
-    {
-        while (controller()->desiredSize() > 0) {
-            size_t available = 0;
-            const void* buffer = nullptr;
-            WebDataConsumerHandle::Result result = m_reader->beginRead(&buffer, WebDataConsumerHandle::FlagNone, &available);
-            if (result == WebDataConsumerHandle::Ok) {
-                RefPtr<ArrayBuffer> arrayBuffer = ArrayBuffer::create(available, 1);
-                memcpy(arrayBuffer->data(), buffer, available);
-                m_reader->endRead(available);
-                controller()->enqueue(DOMUint8Array::create(arrayBuffer.release(), 0, available));
-            } else if (result == WebDataConsumerHandle::ShouldWait) {
-                break;
-            } else if (result == WebDataConsumerHandle::Done) {
-                m_reader = nullptr;
-                controller()->close();
-                break;
-            } else {
-                m_reader = nullptr;
-                controller()->error(V8ThrowException::createTypeError(m_scriptState->isolate(), "Network error"));
-                break;
-            }
-        }
-    }
-
-private:
-    RefPtr<ScriptState> m_scriptState;
-    OwnPtr<WebDataConsumerHandle::Reader> m_reader;
-};
-
 } // namespace
 
 ScriptPromise Body::arrayBuffer(ScriptState* scriptState)
 {
     ScriptPromise promise = rejectInvalidConsumption(scriptState);
     if (!promise.isEmpty())
         return promise;
 
     // When the main thread sends a V8::TerminateExecution() signal to a worker
     // thread, any V8 API on the worker thread starts returning an empty
     // handle. This can happen in this function. To avoid the situation, we
     // first check the ExecutionContext and return immediately if it's already
     // gone (which means that the V8::TerminateExecution() signal has been sent
     // to this worker thread).
     if (!scriptState->getExecutionContext())
         return ScriptPromise();
 
     ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     promise = resolver->promise();
     if (bodyBuffer()) {
-        bodyBuffer()->startLoading(scriptState->getExecutionContext(), FetchDataLoader::createLoaderAsArrayBuffer(), new BodyArrayBufferConsumer(resolver));
+        bodyBuffer()->startLoading(FetchDataLoader::createLoaderAsArrayBuffer(), new BodyArrayBufferConsumer(resolver));
     } else {
         resolver->resolve(DOMArrayBuffer::create(0u, 1));
     }
     return promise;
 }
 
 ScriptPromise Body::blob(ScriptState* scriptState)
 {
     ScriptPromise promise = rejectInvalidConsumption(scriptState);
     if (!promise.isEmpty())
         return promise;
 
     // See above comment.
     if (!scriptState->getExecutionContext())
         return ScriptPromise();
 
     ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     promise = resolver->promise();
     if (bodyBuffer()) {
-        bodyBuffer()->startLoading(scriptState->getExecutionContext(), FetchDataLoader::createLoaderAsBlobHandle(mimeType()), new BodyBlobConsumer(resolver));
+        bodyBuffer()->startLoading(FetchDataLoader::createLoaderAsBlobHandle(mimeType()), new BodyBlobConsumer(resolver));
     } else {
         OwnPtr<BlobData> blobData = BlobData::create();
         blobData->setContentType(mimeType());
         resolver->resolve(Blob::create(BlobDataHandle::create(blobData.release(), 0)));
     }
     return promise;
 
 }
 
 ScriptPromise Body::json(ScriptState* scriptState)
 {
     ScriptPromise promise = rejectInvalidConsumption(scriptState);
     if (!promise.isEmpty())
         return promise;
 
     // See above comment.
     if (!scriptState->getExecutionContext())
         return ScriptPromise();
 
     ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     promise = resolver->promise();
     if (bodyBuffer()) {
-        bodyBuffer()->startLoading(scriptState->getExecutionContext(), FetchDataLoader::createLoaderAsString(), new BodyJsonConsumer(resolver));
+        bodyBuffer()->startLoading(FetchDataLoader::createLoaderAsString(), new BodyJsonConsumer(resolver));
     } else {
         resolver->reject(V8ThrowException::createSyntaxError(scriptState->isolate(), "Unexpected end of input"));
     }
     return promise;
 }
 
 ScriptPromise Body::text(ScriptState* scriptState)
 {
     ScriptPromise promise = rejectInvalidConsumption(scriptState);
     if (!promise.isEmpty())
         return promise;
 
     // See above comment.
     if (!scriptState->getExecutionContext())
         return ScriptPromise();
 
     ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     promise = resolver->promise();
     if (bodyBuffer()) {
-        bodyBuffer()->startLoading(scriptState->getExecutionContext(), FetchDataLoader::createLoaderAsString(), new BodyTextConsumer(resolver));
+        bodyBuffer()->startLoading(FetchDataLoader::createLoaderAsString(), new BodyTextConsumer(resolver));
     } else {
         resolver->resolve(String());
     }
     return promise;
 }
 
-ReadableByteStream* Body::body()
-{
-    return bodyBuffer() ? bodyBuffer()->stream() : nullptr;
-}
-
-ReadableByteStream* Body::bodyWithUseCounter()
+ScriptValue Body::bodyWithUseCounter(ScriptState* scriptState)
 {
     UseCounter::count(getExecutionContext(), UseCounter::FetchBodyStream);
-    return body();
-}
-
-ScriptValue Body::v8ExtraStreamBody(ScriptState* scriptState)
-{
-    if (bodyUsed() || isBodyLocked() || !bodyBuffer())
-        return ScriptValue(scriptState, v8::Undefined(scriptState->isolate()));
-    OwnPtr<FetchDataConsumerHandle> handle = bodyBuffer()->releaseHandle(scriptState->getExecutionContext());
-    return ReadableStreamOperations::createReadableStream(scriptState,
-        new UnderlyingSourceFromDataConsumerHandle(scriptState, handle.release()),
-        ScriptValue(scriptState, v8::Undefined(scriptState->isolate())));
+    if (!bodyBuffer())
+        return ScriptValue::createNull(scriptState);
+    ScriptValue stream = bodyBuffer()->stream();
+    ASSERT(stream.getScriptState() == scriptState);
+    return stream;
 }
 
 bool Body::bodyUsed()
 {
     return bodyBuffer() && bodyBuffer()->isStreamDisturbed();
 }
 
 bool Body::isBodyLocked()
 {
     return bodyBuffer() && bodyBuffer()->isStreamLocked();
 }
 
 bool Body::hasPendingActivity() const
 {
     if (getExecutionContext()->activeDOMObjectsAreStopped())
         return false;
     if (!bodyBuffer())
         return false;
     return bodyBuffer()->hasPendingActivity();
 }
 
-Body::Body(ExecutionContext* context)
-    : ActiveScriptWrappable(this)
-    , ActiveDOMObject(context)
-{
-    suspendIfNeeded();
-}
+Body::Body(ExecutionContext* context) : ActiveScriptWrappable(this) , ContextLifecycleObserver(context) {}
 
 ScriptPromise Body::rejectInvalidConsumption(ScriptState* scriptState)
 {
     if (isBodyLocked() || bodyUsed())
         return ScriptPromise::reject(scriptState, V8ThrowException::createTypeError(scriptState->isolate(), "Already read"));
     return ScriptPromise();
 }
 
 } // namespace blink