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content / common / service_worker / race_network_request_read_buffer_manager.cc [blame]
// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/342213636): Remove this and spanify to fix the errors.
#pragma allow_unsafe_buffers
#endif
#include "content/common/service_worker/race_network_request_read_buffer_manager.h"
#include "base/check_op.h"
#include "base/containers/span.h"
#include "base/memory/scoped_refptr.h"
#include "base/metrics/field_trial_params.h"
#include "content/common/features.h"
#include "mojo/public/c/system/types.h"
#include "net/base/io_buffer.h"
#include "services/network/public/cpp/features.h"
namespace content {
RaceNetworkRequestReadBufferManager::RaceNetworkRequestReadBufferManager(
mojo::ScopedDataPipeConsumerHandle consumer_handle)
: consumer_handle_(std::move(consumer_handle)),
watcher_(FROM_HERE,
mojo::SimpleWatcher::ArmingPolicy::MANUAL,
base::SequencedTaskRunner::GetCurrentDefault()) {}
RaceNetworkRequestReadBufferManager::~RaceNetworkRequestReadBufferManager() =
default;
void RaceNetworkRequestReadBufferManager::Watch(
mojo::SimpleWatcher::ReadyCallbackWithState callback) {
watcher_.Watch(consumer_handle_.get(),
MOJO_HANDLE_SIGNAL_READABLE | MOJO_HANDLE_SIGNAL_PEER_CLOSED,
MOJO_WATCH_CONDITION_SATISFIED, std::move(callback));
}
void RaceNetworkRequestReadBufferManager::ArmOrNotify() {
watcher_.ArmOrNotify();
}
void RaceNetworkRequestReadBufferManager::CancelWatching() {
watcher_.Cancel();
}
std::pair<MojoResult, base::span<const char>>
RaceNetworkRequestReadBufferManager::ReadData() {
CHECK_EQ(BytesRemaining(), 0u);
size_t num_bytes = 0;
MojoResult result;
bool is_query_data_size_mode = base::GetFieldTrialParamByFeatureAsBool(
features::kServiceWorkerAutoPreload, "query_data_size", false);
if (is_query_data_size_mode) {
result = consumer_handle_->ReadData(MOJO_READ_DATA_FLAG_QUERY,
base::span<uint8_t>(), num_bytes);
CHECK_EQ(result, MOJO_RESULT_OK);
// Sometimes queried |num_bytes| is zero. So explicitly set >=1 byte size
// here to avoid receiving |MOJO_RESULT_INVALID_ARGUMENT| from
// DataPipe::ReadData(), which happens if the |num_bytes| is zero.
if (num_bytes == 0) {
num_bytes = network::features::GetDataPipeDefaultAllocationSize();
CHECK_GT(num_bytes, 0u);
}
} else {
num_bytes = base::GetFieldTrialParamByFeatureAsInt(
features::kServiceWorkerAutoPreload, "read_buffer_size",
network::features::GetDataPipeDefaultAllocationSize(
network::features::DataPipeAllocationSize::kLargerSizeIfPossible));
}
scoped_refptr<net::IOBuffer> buffer =
base::MakeRefCounted<net::IOBufferWithSize>(num_bytes);
result = consumer_handle_->ReadData(MOJO_READ_DATA_FLAG_NONE, buffer->span(),
num_bytes);
if (result == MOJO_RESULT_OK) {
buffer_ = base::MakeRefCounted<net::DrainableIOBuffer>(std::move(buffer),
num_bytes);
}
return std::make_pair(result, buffer_ ? base::as_chars(buffer_->span())
: base::span<const char>());
}
void RaceNetworkRequestReadBufferManager::ConsumeData(size_t num_bytes_read) {
CHECK(buffer_);
buffer_->DidConsume(num_bytes_read);
}
size_t RaceNetworkRequestReadBufferManager::BytesRemaining() const {
return buffer_ ? buffer_->BytesRemaining() : 0;
}
base::span<const char> RaceNetworkRequestReadBufferManager::RemainingBuffer()
const {
CHECK(buffer_);
// When there are remaining bytes in |buffer_|, returns them as
// base::span with the actual data size. IOBuffer::span() returns the span
// with the size of the whole buffer, even if data is partially consumed. So
// subspan it with the remaining data size.
return base::as_chars(buffer_->span()).subspan(0, buffer_->BytesRemaining());
}
} // namespace content