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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "services/network/data_pipe_element_reader.h"
#include "base/check_op.h"
#include "base/containers/span.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/location.h"
#include "base/numerics/safe_conversions.h"
#include "base/task/sequenced_task_runner.h"
#include "mojo/public/c/system/types.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
namespace network {
DataPipeElementReader::DataPipeElementReader(
scoped_refptr<ResourceRequestBody> resource_request_body,
mojo::PendingRemote<mojom::DataPipeGetter> data_pipe_getter)
: resource_request_body_(std::move(resource_request_body)),
data_pipe_getter_(std::move(data_pipe_getter)),
handle_watcher_(FROM_HERE,
mojo::SimpleWatcher::ArmingPolicy::MANUAL,
base::SequencedTaskRunner::GetCurrentDefault()) {}
DataPipeElementReader::~DataPipeElementReader() {}
int DataPipeElementReader::Init(net::CompletionOnceCallback callback) {
DCHECK(callback);
// Init rewinds the stream. Throw away current state.
read_callback_.Reset();
buf_ = nullptr;
buf_length_ = 0;
handle_watcher_.Cancel();
size_ = 0;
bytes_read_ = 0;
// Need to do this to prevent any previously pending ReadCallback() invocation
// from running.
weak_factory_.InvalidateWeakPtrs();
// Get a new data pipe and start.
mojo::ScopedDataPipeProducerHandle producer_handle;
if (mojo::CreateDataPipe(nullptr, producer_handle, data_pipe_) !=
MOJO_RESULT_OK) {
return net::ERR_FAILED;
}
data_pipe_getter_->Read(std::move(producer_handle),
base::BindOnce(&DataPipeElementReader::ReadCallback,
weak_factory_.GetWeakPtr()));
handle_watcher_.Watch(
data_pipe_.get(), MOJO_HANDLE_SIGNAL_READABLE,
base::BindRepeating(&DataPipeElementReader::OnHandleReadable,
base::Unretained(this)));
init_callback_ = std::move(callback);
return net::ERR_IO_PENDING;
}
uint64_t DataPipeElementReader::GetContentLength() const {
return size_;
}
uint64_t DataPipeElementReader::BytesRemaining() const {
return size_ - bytes_read_;
}
int DataPipeElementReader::Read(net::IOBuffer* buf,
int buf_length,
net::CompletionOnceCallback callback) {
DCHECK(callback);
DCHECK(!read_callback_);
DCHECK(!init_callback_);
DCHECK(!buf_);
int result = ReadInternal(buf, buf_length);
if (result == net::ERR_IO_PENDING) {
buf_ = buf;
buf_length_ = buf_length;
read_callback_ = std::move(callback);
}
return result;
}
void DataPipeElementReader::ReadCallback(int32_t status, uint64_t size) {
if (status == net::OK)
size_ = size;
if (init_callback_)
std::move(init_callback_).Run(status);
}
void DataPipeElementReader::OnHandleReadable(MojoResult result) {
DCHECK(read_callback_);
DCHECK(buf_);
// Final result of the Read() call, to be passed to the consumer.
int read_result;
if (result == MOJO_RESULT_OK) {
read_result = ReadInternal(buf_.get(), buf_length_);
} else {
read_result = net::ERR_FAILED;
}
buf_ = nullptr;
buf_length_ = 0;
if (read_result != net::ERR_IO_PENDING)
std::move(read_callback_).Run(read_result);
}
int DataPipeElementReader::ReadInternal(net::IOBuffer* buf, int buf_length) {
DCHECK(buf);
DCHECK_GT(buf_length, 0);
if (BytesRemaining() == 0)
return net::OK;
size_t num_bytes = base::checked_cast<size_t>(buf_length);
MojoResult rv = data_pipe_->ReadData(MOJO_READ_DATA_FLAG_NONE,
buf->first(num_bytes), num_bytes);
if (rv == MOJO_RESULT_OK) {
bytes_read_ += num_bytes;
return base::checked_cast<int>(num_bytes);
}
if (rv == MOJO_RESULT_SHOULD_WAIT) {
handle_watcher_.ArmOrNotify();
return net::ERR_IO_PENDING;
}
return net::ERR_FAILED;
}
} // namespace network
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