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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/quic_session.h"
#include "net/quic/quic_connection.h"
using base::StringPiece;
using base::hash_map;
using base::hash_set;
using std::vector;
namespace net {
QuicSession::QuicSession(QuicConnection* connection, bool is_server)
: connection_(connection),
max_open_streams_(kDefaultMaxStreamsPerConnection),
next_stream_id_(is_server ? 2 : 3),
is_server_(is_server),
largest_peer_created_stream_id_(0) {
connection_->set_visitor(this);
}
QuicSession::~QuicSession() {
}
bool QuicSession::OnPacket(const IPEndPoint& self_address,
const IPEndPoint& peer_address,
const QuicPacketHeader& header,
const vector<QuicStreamFrame>& frames) {
if (header.guid != connection()->guid()) {
DLOG(INFO) << "Got packet header for invalid GUID: " << header.guid;
return false;
}
for (size_t i = 0; i < frames.size(); ++i) {
// TODO(rch) deal with the error case of stream id 0
if (IsClosedStream(frames[i].stream_id)) continue;
ReliableQuicStream* stream = GetStream(frames[i].stream_id);
if (stream == NULL) return false;
if (!stream->WillAcceptStreamFrame(frames[i])) return false;
// TODO(alyssar) check against existing connection address: if changed, make
// sure we update the connection.
}
for (size_t i = 0; i < frames.size(); ++i) {
ReliableQuicStream* stream = GetStream(frames[i].stream_id);
if (stream) {
stream->OnStreamFrame(frames[i]);
}
}
return true;
}
void QuicSession::OnRstStream(const QuicRstStreamFrame& frame) {
ReliableQuicStream* stream = GetStream(frame.stream_id);
if (!stream) {
return; // Errors are handled by GetStream.
}
stream->OnStreamReset(frame.error_code, frame.offset);
}
void QuicSession::ConnectionClose(QuicErrorCode error, bool from_peer) {
while (stream_map_.size() != 0) {
ReliableStreamMap::iterator it = stream_map_.begin();
QuicStreamId id = it->first;
it->second->ConnectionClose(error, from_peer);
// The stream should call CloseStream as part of ConnectionClose.
if (stream_map_.find(id) != stream_map_.end()) {
LOG(DFATAL) << "Stream failed to close under ConnectionClose";
CloseStream(id);
}
}
}
int QuicSession::WriteData(QuicStreamId id, StringPiece data,
QuicStreamOffset offset, bool fin) {
return connection_->SendStreamData(id, data, offset, fin, NULL);
}
void QuicSession::SendRstStream(QuicStreamId id,
QuicErrorCode error,
QuicStreamOffset offset) {
connection_->SendRstStream(id, error, offset);
CloseStream(id);
}
void QuicSession::CloseStream(QuicStreamId stream_id) {
DLOG(INFO) << "Closing stream " << stream_id;
ReliableStreamMap::iterator it = stream_map_.find(stream_id);
if (it == stream_map_.end()) {
DLOG(INFO) << "Stream is already closed: " << stream_id;
return;
}
stream_map_.erase(it);
}
bool QuicSession::IsHandshakeComplete() {
return GetCryptoStream()->handshake_complete();
}
void QuicSession::ActivateStream(ReliableQuicStream* stream) {
LOG(INFO) << "num_streams: " << stream_map_.size()
<< ". activating " << stream->id();
DCHECK(stream_map_.count(stream->id()) == 0);
stream_map_[stream->id()] = stream;
}
QuicStreamId QuicSession::GetNextStreamId() {
QuicStreamId id = next_stream_id_;
next_stream_id_ += 2;
return id;
}
ReliableQuicStream* QuicSession::GetStream(const QuicStreamId stream_id) {
if (stream_id == kCryptoStreamId) {
return GetCryptoStream();
}
ReliableStreamMap::iterator it = stream_map_.find(stream_id);
if (it != stream_map_.end()) {
return it->second;
}
if (stream_id % 2 == next_stream_id_ % 2) {
// We've received a frame for a locally-created stream that is not
// currently active. This is an error.
connection()->SendConnectionClose(QUIC_PACKET_FOR_NONEXISTENT_STREAM);
return NULL;
}
return GetIncomingReliableStream(stream_id);
}
ReliableQuicStream* QuicSession::GetIncomingReliableStream(
QuicStreamId stream_id) {
if (IsClosedStream(stream_id)) {
return NULL;
}
implicitly_created_streams_.erase(stream_id);
if (stream_id > largest_peer_created_stream_id_) {
// TODO(rch) add unit test for this
if (stream_id - largest_peer_created_stream_id_ > kMaxStreamIdDelta) {
connection()->SendConnectionClose(QUIC_INVALID_STREAM_ID);
return NULL;
}
if (largest_peer_created_stream_id_ != 0) {
for (QuicStreamId id = largest_peer_created_stream_id_ + 2;
id < stream_id;
id += 2) {
implicitly_created_streams_.insert(id);
}
}
largest_peer_created_stream_id_ = stream_id;
}
ReliableQuicStream* stream = CreateIncomingReliableStream(stream_id);
if (stream == NULL) {
connection()->SendConnectionClose(QUIC_TOO_MANY_OPEN_STREAMS);
return NULL;
}
ActivateStream(stream);
return stream;
}
bool QuicSession::IsClosedStream(QuicStreamId id) {
DCHECK_NE(0u, id);
if (id == kCryptoStreamId) {
return false;
}
if (stream_map_.count(id) != 0) {
// Stream is active
return false;
}
if (id % 2 == next_stream_id_ % 2) {
// Locally created streams are strictly in-order. If the id is in the
// range of created streams and it's not active, it must have been closed.
return id < next_stream_id_;
}
// For peer created streams, we also need to consider implicitly created
// streams.
return id <= largest_peer_created_stream_id_ &&
implicitly_created_streams_.count(id) == 0;
}
size_t QuicSession::GetNumOpenStreams() {
return stream_map_.size() + implicitly_created_streams_.size();
}
} // namespace net
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