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// Copyright 2016 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 "content/browser/service_worker/service_worker_stream_reader.h"
#include "content/browser/resource_context_impl.h"
#include "content/browser/service_worker/service_worker_version.h"
#include "content/browser/streams/stream.h"
#include "content/browser/streams/stream_context.h"
#include "content/browser/streams/stream_registry.h"
#include "net/base/io_buffer.h"
namespace content {
ServiceWorkerStreamReader::ServiceWorkerStreamReader(
ServiceWorkerURLRequestJob* owner,
scoped_refptr<ServiceWorkerVersion> streaming_version)
: owner_(owner),
stream_pending_buffer_size_(0),
streaming_version_(streaming_version) {
streaming_version_->AddStreamingURLRequestJob(owner_);
}
ServiceWorkerStreamReader::~ServiceWorkerStreamReader() {
if (streaming_version_) {
streaming_version_->RemoveStreamingURLRequestJob(owner_);
streaming_version_ = nullptr;
}
if (stream_) {
stream_->RemoveReadObserver(this);
stream_->Abort();
stream_ = nullptr;
}
if (!waiting_stream_url_.is_empty()) {
StreamRegistry* stream_registry =
GetStreamContextForResourceContext(owner_->resource_context())
->registry();
stream_registry->RemoveRegisterObserver(waiting_stream_url_);
stream_registry->AbortPendingStream(waiting_stream_url_);
}
}
void ServiceWorkerStreamReader::Start(const GURL& stream_url) {
DCHECK(!stream_);
DCHECK(waiting_stream_url_.is_empty());
StreamContext* stream_context =
GetStreamContextForResourceContext(owner_->resource_context());
stream_ = stream_context->registry()->GetStream(stream_url);
if (!stream_) {
waiting_stream_url_ = stream_url;
// Wait for StreamHostMsg_StartBuilding message from the ServiceWorker.
stream_context->registry()->SetRegisterObserver(waiting_stream_url_, this);
return;
}
stream_->SetReadObserver(this);
owner_->OnResponseStarted();
}
int ServiceWorkerStreamReader::ReadRawData(net::IOBuffer* buf, int buf_size) {
DCHECK(stream_);
DCHECK(waiting_stream_url_.is_empty());
int bytes_read = 0;
switch (stream_->ReadRawData(buf, buf_size, &bytes_read)) {
case Stream::STREAM_HAS_DATA:
DCHECK_GT(bytes_read, 0);
return bytes_read;
case Stream::STREAM_COMPLETE:
DCHECK_EQ(0, bytes_read);
owner_->RecordResult(ServiceWorkerMetrics::REQUEST_JOB_STREAM_RESPONSE);
return 0;
case Stream::STREAM_EMPTY:
stream_pending_buffer_ = buf;
stream_pending_buffer_size_ = buf_size;
return net::ERR_IO_PENDING;
case Stream::STREAM_ABORTED:
// Handle this as connection reset.
owner_->RecordResult(
ServiceWorkerMetrics::REQUEST_JOB_ERROR_STREAM_ABORTED);
return net::ERR_CONNECTION_RESET;
}
NOTREACHED();
return net::ERR_FAILED;
}
void ServiceWorkerStreamReader::OnDataAvailable(Stream* stream) {
// Do nothing if stream_pending_buffer_ is empty, i.e. there's no ReadRawData
// operation waiting for IO completion.
if (!stream_pending_buffer_)
return;
// stream_pending_buffer_ is set to the IOBuffer instance provided to
// ReadRawData() by URLRequestJob.
int result = 0;
switch (stream_->ReadRawData(stream_pending_buffer_.get(),
stream_pending_buffer_size_, &result)) {
case Stream::STREAM_HAS_DATA:
DCHECK_GT(result, 0);
break;
case Stream::STREAM_COMPLETE:
// Calling NotifyReadComplete with 0 signals completion.
DCHECK(!result);
owner_->RecordResult(ServiceWorkerMetrics::REQUEST_JOB_STREAM_RESPONSE);
break;
case Stream::STREAM_EMPTY:
NOTREACHED();
break;
case Stream::STREAM_ABORTED:
// Handle this as connection reset.
result = net::ERR_CONNECTION_RESET;
owner_->RecordResult(
ServiceWorkerMetrics::REQUEST_JOB_ERROR_STREAM_ABORTED);
break;
}
// Clear the buffers before notifying the read is complete, so that it is
// safe for the observer to read.
stream_pending_buffer_ = nullptr;
stream_pending_buffer_size_ = 0;
owner_->OnReadRawDataComplete(result);
}
void ServiceWorkerStreamReader::OnStreamRegistered(Stream* stream) {
StreamContext* stream_context =
GetStreamContextForResourceContext(owner_->resource_context());
stream_context->registry()->RemoveRegisterObserver(waiting_stream_url_);
waiting_stream_url_ = GURL();
stream_ = stream;
stream_->SetReadObserver(this);
owner_->OnResponseStarted();
}
} // namespace content
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