mirror of
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105 lines
3.2 KiB
C++
105 lines
3.2 KiB
C++
// Copyright (c) 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "net/quic/chromium/quic_chromium_packet_reader.h"
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#include "base/location.h"
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#include "base/metrics/histogram_macros.h"
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#include "base/single_thread_task_runner.h"
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#include "base/threading/thread_task_runner_handle.h"
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#include "net/base/net_errors.h"
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#include "net/quic/platform/api/quic_clock.h"
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namespace net {
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QuicChromiumPacketReader::QuicChromiumPacketReader(
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DatagramClientSocket* socket,
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QuicClock* clock,
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Visitor* visitor,
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int yield_after_packets,
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QuicTime::Delta yield_after_duration,
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const NetLogWithSource& net_log)
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: socket_(socket),
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visitor_(visitor),
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read_pending_(false),
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num_packets_read_(0),
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clock_(clock),
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yield_after_packets_(yield_after_packets),
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yield_after_duration_(yield_after_duration),
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yield_after_(QuicTime::Infinite()),
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read_buffer_(new IOBufferWithSize(static_cast<size_t>(kMaxPacketSize))),
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net_log_(net_log),
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weak_factory_(this) {}
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QuicChromiumPacketReader::~QuicChromiumPacketReader() {}
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void QuicChromiumPacketReader::StartReading() {
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for (;;) {
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if (read_pending_)
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return;
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if (num_packets_read_ == 0)
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yield_after_ = clock_->Now() + yield_after_duration_;
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DCHECK(socket_);
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read_pending_ = true;
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int rv = socket_->Read(read_buffer_.get(), read_buffer_->size(),
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base::Bind(&QuicChromiumPacketReader::OnReadComplete,
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weak_factory_.GetWeakPtr()));
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UMA_HISTOGRAM_BOOLEAN("Net.QuicSession.AsyncRead", rv == ERR_IO_PENDING);
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if (rv == ERR_IO_PENDING) {
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num_packets_read_ = 0;
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return;
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}
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if (++num_packets_read_ > yield_after_packets_ ||
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clock_->Now() > yield_after_) {
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num_packets_read_ = 0;
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// Data was read, process it.
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// Schedule the work through the message loop to 1) prevent infinite
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// recursion and 2) avoid blocking the thread for too long.
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base::ThreadTaskRunnerHandle::Get()->PostTask(
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FROM_HERE, base::Bind(&QuicChromiumPacketReader::OnReadComplete,
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weak_factory_.GetWeakPtr(), rv));
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} else {
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if (!ProcessReadResult(rv)) {
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return;
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}
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}
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}
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}
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size_t QuicChromiumPacketReader::EstimateMemoryUsage() const {
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// Return the size of |read_buffer_|.
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return kMaxPacketSize;
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}
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bool QuicChromiumPacketReader::ProcessReadResult(int result) {
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read_pending_ = false;
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if (result == 0)
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result = ERR_CONNECTION_CLOSED;
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if (result < 0) {
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visitor_->OnReadError(result, socket_);
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return false;
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}
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QuicReceivedPacket packet(read_buffer_->data(), result, clock_->Now());
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IPEndPoint local_address;
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IPEndPoint peer_address;
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socket_->GetLocalAddress(&local_address);
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socket_->GetPeerAddress(&peer_address);
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return visitor_->OnPacket(
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packet, QuicSocketAddress(QuicSocketAddressImpl(local_address)),
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QuicSocketAddress(QuicSocketAddressImpl(peer_address)));
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}
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void QuicChromiumPacketReader::OnReadComplete(int result) {
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if (ProcessReadResult(result)) {
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StartReading();
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}
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}
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} // namespace net
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