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|
// 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 "config.h"
#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/fileapi/Blob.h"
#include "core/fileapi/FileReaderLoader.h"
#include "core/fileapi/FileReaderLoaderClient.h"
#include "core/streams/UnderlyingSource.h"
#include "modules/fetch/BodyStreamBuffer.h"
namespace blink {
class Body::BlobHandleReceiver final : public BodyStreamBuffer::BlobHandleCreatorClient {
public:
explicit BlobHandleReceiver(Body* body)
: m_body(body)
{
}
void didCreateBlobHandle(PassRefPtr<BlobDataHandle> handle) override
{
ASSERT(m_body);
m_body->readAsyncFromBlob(handle);
m_body = nullptr;
}
void didFail(PassRefPtrWillBeRawPtr<DOMException> exception) override
{
ASSERT(m_body);
m_body->didBlobHandleReceiveError(exception);
m_body = nullptr;
}
void trace(Visitor* visitor) override
{
BodyStreamBuffer::BlobHandleCreatorClient::trace(visitor);
visitor->trace(m_body);
}
private:
Member<Body> m_body;
};
class Body::ReadableStreamSource : public GarbageCollectedFinalized<ReadableStreamSource>, public UnderlyingSource {
USING_GARBAGE_COLLECTED_MIXIN(ReadableStreamSource);
public:
ReadableStreamSource(Body* body) : m_body(body) { }
~ReadableStreamSource() override { }
void pullSource() override { m_body->pullSource(); }
ScriptPromise cancelSource(ScriptState* scriptState, ScriptValue reason) override
{
return ScriptPromise();
}
void trace(Visitor* visitor) override
{
visitor->trace(m_body);
UnderlyingSource::trace(visitor);
}
private:
Member<Body> m_body;
};
void Body::pullSource()
{
if (!m_streamAccessed) {
// We do not download data unless the user explicitly uses the
// ReadableStream object in order to avoid performance regression,
// because currently Chrome cannot handle Streams efficiently
// especially with ServiceWorker or Blob.
return;
}
if (m_bodyUsed) {
m_stream->error(DOMException::create(InvalidStateError, "The stream is locked."));
return;
}
ASSERT(!m_loader);
if (buffer()) {
// If the body has a body buffer, we read all data from the buffer and
// create a blob and then put the data from the blob to |m_stream|.
// FIXME: Put the data directry from the buffer.
buffer()->readAllAndCreateBlobHandle(contentTypeForBuffer(), new BlobHandleReceiver(this));
return;
}
RefPtr<BlobDataHandle> blobHandle = blobDataHandle();
if (!blobHandle.get()) {
blobHandle = BlobDataHandle::create(BlobData::create(), 0);
}
readAsyncFromBlob(blobHandle);
}
ScriptPromise Body::readAsync(ScriptState* scriptState, ResponseType type)
{
if (m_bodyUsed)
return ScriptPromise::reject(scriptState, V8ThrowException::createTypeError(scriptState->isolate(), "Already read"));
// 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 Body::readAsync. 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).
ExecutionContext* executionContext = scriptState->executionContext();
if (!executionContext)
return ScriptPromise();
m_bodyUsed = true;
m_responseType = type;
ASSERT(!m_resolver);
m_resolver = ScriptPromiseResolver::create(scriptState);
ScriptPromise promise = m_resolver->promise();
if (m_streamAccessed) {
// 'body' attribute was accessed and the stream source started pulling.
switch (m_stream->state()) {
case ReadableStream::Readable:
readAllFromStream(scriptState);
return promise;
case ReadableStream::Waiting:
// m_loader is working and m_resolver will be resolved when it
// ends.
return promise;
case ReadableStream::Closed:
case ReadableStream::Errored:
m_resolver->resolve(m_stream->closed(scriptState).v8Value());
return promise;
break;
}
ASSERT_NOT_REACHED();
return promise;
}
if (buffer()) {
buffer()->readAllAndCreateBlobHandle(contentTypeForBuffer(), new BlobHandleReceiver(this));
return promise;
}
readAsyncFromBlob(blobDataHandle());
return promise;
}
void Body::readAsyncFromBlob(PassRefPtr<BlobDataHandle> handle)
{
if (m_streamAccessed) {
FileReaderLoader::ReadType readType = FileReaderLoader::ReadAsArrayBuffer;
m_loader = adoptPtr(new FileReaderLoader(readType, this));
m_loader->start(executionContext(), handle);
return;
}
FileReaderLoader::ReadType readType = FileReaderLoader::ReadAsText;
RefPtr<BlobDataHandle> blobHandle = handle;
if (!blobHandle.get()) {
blobHandle = BlobDataHandle::create(BlobData::create(), 0);
}
switch (m_responseType) {
case ResponseAsArrayBuffer:
readType = FileReaderLoader::ReadAsArrayBuffer;
break;
case ResponseAsBlob:
if (blobHandle->size() != kuint64max) {
// If the size of |blobHandle| is set correctly, creates Blob from
// it.
m_resolver->resolve(Blob::create(blobHandle));
m_resolver.clear();
return;
}
// If the size is not set, read as ArrayBuffer and create a new blob to
// get the size.
// FIXME: This workaround is not good for performance.
// When we will stop using Blob as a base system of Body to support
// stream, this problem should be solved.
readType = FileReaderLoader::ReadAsArrayBuffer;
break;
case ResponseAsFormData:
// FIXME: Implement this.
ASSERT_NOT_REACHED();
break;
case ResponseAsJSON:
case ResponseAsText:
break;
default:
ASSERT_NOT_REACHED();
}
m_loader = adoptPtr(new FileReaderLoader(readType, this));
m_loader->start(m_resolver->scriptState()->executionContext(), blobHandle);
return;
}
void Body::readAllFromStream(ScriptState* scriptState)
{
// With the current loading mechanism, the data is loaded atomically.
ASSERT(m_stream->isDraining());
TrackExceptionState es;
// FIXME: Implement and use another |read| method that doesn't
// need an exception state and V8ArrayBuffer.
ScriptValue value = m_stream->read(scriptState, es);
ASSERT(!es.hadException());
ASSERT(m_stream->state() == ReadableStream::Closed);
ASSERT(!value.isEmpty() && V8ArrayBuffer::hasInstance(value.v8Value(), scriptState->isolate()));
DOMArrayBuffer* buffer = V8ArrayBuffer::toImpl(value.v8Value().As<v8::Object>());
didFinishLoadingViaStream(buffer);
m_resolver.clear();
m_stream->close();
}
ScriptPromise Body::arrayBuffer(ScriptState* scriptState)
{
return readAsync(scriptState, ResponseAsArrayBuffer);
}
ScriptPromise Body::blob(ScriptState* scriptState)
{
return readAsync(scriptState, ResponseAsBlob);
}
ScriptPromise Body::formData(ScriptState* scriptState)
{
return readAsync(scriptState, ResponseAsFormData);
}
ScriptPromise Body::json(ScriptState* scriptState)
{
return readAsync(scriptState, ResponseAsJSON);
}
ScriptPromise Body::text(ScriptState* scriptState)
{
return readAsync(scriptState, ResponseAsText);
}
ReadableStream* Body::body()
{
if (!m_streamAccessed) {
m_streamAccessed = true;
if (m_stream->isPulling()) {
// The stream has been pulling, but the source ignored the
// instruction because it didn't know the user wanted to use the
// ReadableStream interface. Now it knows the user does, so have
// the source start pulling.
m_streamSource->pullSource();
}
}
return m_stream;
}
bool Body::bodyUsed() const
{
return m_bodyUsed;
}
void Body::setBodyUsed()
{
m_bodyUsed = true;
}
bool Body::streamAccessed() const
{
return m_streamAccessed;
}
void Body::stop()
{
// Canceling the load will call didFail which will remove the resolver.
if (m_loader)
m_loader->cancel();
}
bool Body::hasPendingActivity() const
{
if (m_resolver)
return true;
if (m_streamAccessed && (m_stream->state() == ReadableStream::Readable || m_stream->state() == ReadableStream::Waiting))
return true;
return false;
}
void Body::trace(Visitor* visitor)
{
visitor->trace(m_resolver);
visitor->trace(m_stream);
visitor->trace(m_streamSource);
ActiveDOMObject::trace(visitor);
}
Body::Body(ExecutionContext* context)
: ActiveDOMObject(context)
, m_bodyUsed(false)
, m_streamAccessed(false)
, m_responseType(ResponseType::ResponseUnknown)
, m_streamSource(new ReadableStreamSource(this))
, m_stream(new ReadableStreamImpl<ReadableStreamChunkTypeTraits<DOMArrayBuffer>>(context, m_streamSource))
{
m_stream->didSourceStart();
}
Body::Body(const Body& copy_from)
: ActiveDOMObject(copy_from.lifecycleContext())
, m_bodyUsed(copy_from.bodyUsed())
, m_responseType(ResponseType::ResponseUnknown)
, m_streamSource(new ReadableStreamSource(this))
, m_stream(new ReadableStreamImpl<ReadableStreamChunkTypeTraits<DOMArrayBuffer>>(copy_from.executionContext(), m_streamSource))
{
m_stream->didSourceStart();
}
void Body::resolveJSON(const String& string)
{
ASSERT(m_responseType == ResponseAsJSON);
ScriptState::Scope scope(m_resolver->scriptState());
v8::Isolate* isolate = m_resolver->scriptState()->isolate();
v8::Local<v8::String> inputString = v8String(isolate, string);
v8::TryCatch trycatch;
v8::Local<v8::Value> parsed = v8::JSON::Parse(inputString);
if (parsed.IsEmpty()) {
if (trycatch.HasCaught())
m_resolver->reject(trycatch.Exception());
else
m_resolver->reject(v8::Exception::Error(v8::String::NewFromUtf8(isolate, "JSON parse error")));
return;
}
m_resolver->resolve(parsed);
}
// FileReaderLoaderClient functions.
void Body::didStartLoading() { }
void Body::didReceiveData() { }
void Body::didFinishLoading()
{
if (!executionContext() || executionContext()->activeDOMObjectsAreStopped())
return;
if (m_streamAccessed) {
didFinishLoadingViaStream(m_loader->arrayBufferResult().get());
m_resolver.clear();
m_stream->close();
return;
}
switch (m_responseType) {
case ResponseAsArrayBuffer:
m_resolver->resolve(m_loader->arrayBufferResult());
break;
case ResponseAsBlob: {
ASSERT(blobDataHandle()->size() == kuint64max);
OwnPtr<BlobData> blobData = BlobData::create();
RefPtr<DOMArrayBuffer> buffer = m_loader->arrayBufferResult();
blobData->appendBytes(buffer->data(), buffer->byteLength());
const size_t length = blobData->length();
m_resolver->resolve(Blob::create(BlobDataHandle::create(blobData.release(), length)));
break;
}
case ResponseAsFormData:
ASSERT_NOT_REACHED();
break;
case ResponseAsJSON:
resolveJSON(m_loader->stringResult());
break;
case ResponseAsText:
m_resolver->resolve(m_loader->stringResult());
break;
default:
ASSERT_NOT_REACHED();
}
m_resolver.clear();
m_stream->close();
}
void Body::didFinishLoadingViaStream(DOMArrayBuffer* buffer)
{
if (!m_bodyUsed) {
// |m_stream| is pulling.
ASSERT(m_streamAccessed);
m_stream->enqueue(buffer);
return;
}
switch (m_responseType) {
case ResponseAsArrayBuffer:
m_resolver->resolve(buffer);
break;
case ResponseAsBlob: {
OwnPtr<BlobData> blobData = BlobData::create();
blobData->appendBytes(buffer->data(), buffer->byteLength());
m_resolver->resolve(Blob::create(BlobDataHandle::create(blobData.release(), blobData->length())));
break;
}
case ResponseAsFormData:
ASSERT_NOT_REACHED();
break;
case ResponseAsJSON: {
String s = String::fromUTF8(static_cast<const char*>(buffer->data()), buffer->byteLength());
if (s.isNull())
m_resolver->reject(DOMException::create(NetworkError, "Invalid utf-8 string"));
else
resolveJSON(s);
break;
}
case ResponseAsText: {
String s = String::fromUTF8(static_cast<const char*>(buffer->data()), buffer->byteLength());
if (s.isNull())
m_resolver->reject(DOMException::create(NetworkError, "Invalid utf-8 string"));
else
m_resolver->resolve(s);
break;
}
default:
ASSERT_NOT_REACHED();
}
}
void Body::didFail(FileError::ErrorCode code)
{
if (!executionContext() || executionContext()->activeDOMObjectsAreStopped())
return;
if (m_resolver) {
// FIXME: We should reject the promise.
m_resolver->resolve("");
m_resolver.clear();
}
m_stream->error(DOMException::create(NetworkError, "network error"));
}
void Body::didBlobHandleReceiveError(PassRefPtrWillBeRawPtr<DOMException> exception)
{
if (!m_resolver)
return;
m_resolver->reject(exception);
m_resolver.clear();
}
} // namespace blink
|
