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// Copyright (c) 2012 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 "net/quic/reliable_quic_stream.h"
#include "net/quic/quic_session.h"
using base::StringPiece;
namespace net {
ReliableQuicStream::ReliableQuicStream(QuicStreamId id,
QuicSession* session)
: sequencer_(this),
id_(id),
session_(session),
visitor_(NULL),
stream_bytes_read_(0),
stream_bytes_written_(0),
stream_error_(QUIC_STREAM_NO_ERROR),
connection_error_(QUIC_NO_ERROR),
read_side_closed_(false),
write_side_closed_(false),
fin_buffered_(false),
fin_sent_(false) {
}
ReliableQuicStream::~ReliableQuicStream() {
}
bool ReliableQuicStream::WillAcceptStreamFrame(
const QuicStreamFrame& frame) const {
if (read_side_closed_) {
return true;
}
if (frame.stream_id != id_) {
LOG(ERROR) << "Error!";
return false;
}
return sequencer_.WillAcceptStreamFrame(frame);
}
bool ReliableQuicStream::OnStreamFrame(const QuicStreamFrame& frame) {
DCHECK_EQ(frame.stream_id, id_);
if (read_side_closed_) {
DLOG(INFO) << "Ignoring frame " << frame.stream_id;
// We don't want to be reading: blackhole the data.
return true;
}
// Note: This count include duplicate data received.
stream_bytes_read_ += frame.data.length();
bool accepted = sequencer_.OnStreamFrame(frame);
if (frame.fin) {
sequencer_.CloseStreamAtOffset(frame.offset + frame.data.size(), true);
}
return accepted;
}
void ReliableQuicStream::OnStreamReset(QuicRstStreamErrorCode error) {
stream_error_ = error;
TerminateFromPeer(false); // Full close.
}
void ReliableQuicStream::ConnectionClose(QuicErrorCode error, bool from_peer) {
if (error != QUIC_NO_ERROR) {
stream_error_ = QUIC_STREAM_CONNECTION_ERROR;
connection_error_ = error;
}
if (from_peer) {
TerminateFromPeer(false);
} else {
CloseWriteSide();
CloseReadSide();
}
}
void ReliableQuicStream::TerminateFromPeer(bool half_close) {
if (!half_close) {
CloseWriteSide();
}
CloseReadSide();
}
void ReliableQuicStream::Close(QuicRstStreamErrorCode error) {
stream_error_ = error;
session()->SendRstStream(id(), error);
}
bool ReliableQuicStream::IsHalfClosed() const {
return sequencer_.IsHalfClosed();
}
bool ReliableQuicStream::HasBytesToRead() const {
return sequencer_.HasBytesToRead();
}
const IPEndPoint& ReliableQuicStream::GetPeerAddress() const {
return session_->peer_address();
}
QuicConsumedData ReliableQuicStream::WriteData(StringPiece data, bool fin) {
return WriteOrBuffer(data, fin);
}
QuicConsumedData ReliableQuicStream::WriteOrBuffer(StringPiece data, bool fin) {
DCHECK(!fin_buffered_);
QuicConsumedData consumed_data(0, false);
fin_buffered_ = fin;
if (queued_data_.empty()) {
consumed_data = WriteDataInternal(string(data.data(), data.length()), fin);
DCHECK_LE(consumed_data.bytes_consumed, data.length());
}
// If there's unconsumed data or an unconsumed fin, queue it.
if (consumed_data.bytes_consumed < data.length() ||
(fin && !consumed_data.fin_consumed)) {
queued_data_.push_back(
string(data.data() + consumed_data.bytes_consumed,
data.length() - consumed_data.bytes_consumed));
}
return QuicConsumedData(data.size(), true);
}
void ReliableQuicStream::OnCanWrite() {
bool fin = false;
while (!queued_data_.empty()) {
const string& data = queued_data_.front();
if (queued_data_.size() == 1 && fin_buffered_) {
fin = true;
}
QuicConsumedData consumed_data = WriteDataInternal(data, fin);
if (consumed_data.bytes_consumed == data.size() &&
fin == consumed_data.fin_consumed) {
queued_data_.pop_front();
} else {
queued_data_.front().erase(0, consumed_data.bytes_consumed);
break;
}
}
}
QuicConsumedData ReliableQuicStream::WriteDataInternal(
StringPiece data, bool fin) {
if (write_side_closed_) {
DLOG(ERROR) << "Attempt to write when the write side is closed";
return QuicConsumedData(0, false);
}
QuicConsumedData consumed_data =
session()->WriteData(id(), data, stream_bytes_written_, fin);
stream_bytes_written_ += consumed_data.bytes_consumed;
if (consumed_data.bytes_consumed == data.length()) {
if (fin && consumed_data.fin_consumed) {
fin_sent_ = true;
CloseWriteSide();
}
} else {
session_->MarkWriteBlocked(id());
}
return consumed_data;
}
void ReliableQuicStream::CloseReadSide() {
if (read_side_closed_) {
return;
}
DLOG(INFO) << "Done reading from stream " << id();
read_side_closed_ = true;
if (write_side_closed_) {
DLOG(INFO) << "Closing stream: " << id();
session_->CloseStream(id());
}
}
void ReliableQuicStream::CloseWriteSide() {
if (write_side_closed_) {
return;
}
DLOG(INFO) << "Done writing to stream " << id();
write_side_closed_ = true;
if (read_side_closed_) {
DLOG(INFO) << "Closing stream: " << id();
session_->CloseStream(id());
}
}
void ReliableQuicStream::OnClose() {
if (visitor_) {
Visitor* visitor = visitor_;
// Calling Visitor::OnClose() may result the destruction of the visitor,
// so we need to ensure we don't call it again.
visitor_ = NULL;
visitor->OnClose(this);
}
}
} // namespace net
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