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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.
//
// A server side dispatcher which dispatches a given client's data to their
// stream.
#ifndef NET_TOOLS_QUIC_QUIC_DISPATCHER_H_
#define NET_TOOLS_QUIC_QUIC_DISPATCHER_H_
#include <list>
#include "base/containers/hash_tables.h"
#include "base/memory/scoped_ptr.h"
#include "net/base/ip_endpoint.h"
#include "net/base/linked_hash_map.h"
#include "net/quic/quic_blocked_writer_interface.h"
#include "net/quic/quic_packet_writer.h"
#include "net/quic/quic_protocol.h"
#include "net/tools/epoll_server/epoll_server.h"
#include "net/tools/quic/quic_server_session.h"
#include "net/tools/quic/quic_time_wait_list_manager.h"
#if defined(COMPILER_GCC)
namespace BASE_HASH_NAMESPACE {
template<>
struct hash<net::QuicBlockedWriterInterface*> {
std::size_t operator()(
const net::QuicBlockedWriterInterface* ptr) const {
return hash<size_t>()(reinterpret_cast<size_t>(ptr));
}
};
}
#endif
namespace net {
class EpollServer;
class QuicConfig;
class QuicCryptoServerConfig;
class QuicSession;
namespace tools {
namespace test {
class QuicDispatcherPeer;
} // namespace test
class DeleteSessionsAlarm;
class QuicEpollConnectionHelper;
class QuicDispatcher : public QuicPacketWriter, public QuicSessionOwner {
public:
// Ideally we'd have a linked_hash_set: the boolean is unused.
typedef linked_hash_map<QuicBlockedWriterInterface*, bool> WriteBlockedList;
// Due to the way delete_sessions_closure_ is registered, the Dispatcher
// must live until epoll_server Shutdown.
QuicDispatcher(const QuicConfig& config,
const QuicCryptoServerConfig& crypto_config,
int fd,
EpollServer* epoll_server);
virtual ~QuicDispatcher();
// QuicPacketWriter
virtual WriteResult WritePacket(
const char* buffer, size_t buf_len,
const IPAddressNumber& self_address,
const IPEndPoint& peer_address,
QuicBlockedWriterInterface* writer) OVERRIDE;
virtual bool IsWriteBlockedDataBuffered() const OVERRIDE;
virtual void ProcessPacket(const IPEndPoint& server_address,
const IPEndPoint& client_address,
QuicGuid guid,
const QuicEncryptedPacket& packet);
// Called when the underyling connection becomes writable to allow
// queued writes to happen.
//
// Returns true if more writes are possible, false otherwise.
virtual bool OnCanWrite();
// Sends ConnectionClose frames to all connected clients.
void Shutdown();
// Ensure that the closed connection is cleaned up asynchronously.
virtual void OnConnectionClosed(QuicGuid guid, QuicErrorCode error) OVERRIDE;
// Sets the fd and creates a default packet writer with that fd.
void set_fd(int fd);
typedef base::hash_map<QuicGuid, QuicSession*> SessionMap;
virtual QuicSession* CreateQuicSession(
QuicGuid guid,
const IPEndPoint& client_address);
// Deletes all sessions on the closed session list and clears the list.
void DeleteSessions();
const SessionMap& session_map() const { return session_map_; }
// Uses the specified |writer| instead of QuicSocketUtils and takes ownership
// of writer.
void UseWriter(QuicPacketWriter* writer);
WriteBlockedList* write_blocked_list() { return &write_blocked_list_; }
protected:
const QuicConfig& config_;
const QuicCryptoServerConfig& crypto_config_;
QuicTimeWaitListManager* time_wait_list_manager() {
return time_wait_list_manager_.get();
}
QuicEpollConnectionHelper* helper() { return helper_.get(); }
EpollServer* epoll_server() { return epoll_server_; }
private:
friend class net::tools::test::QuicDispatcherPeer;
// Removes the session from the session map and write blocked list, and
// adds the GUID to the time-wait list.
void CleanUpSession(SessionMap::iterator it);
// The list of connections waiting to write.
WriteBlockedList write_blocked_list_;
SessionMap session_map_;
// Entity that manages guids in time wait state.
scoped_ptr<QuicTimeWaitListManager> time_wait_list_manager_;
// An alarm which deletes closed sessions.
scoped_ptr<DeleteSessionsAlarm> delete_sessions_alarm_;
// The list of closed but not-yet-deleted sessions.
std::list<QuicSession*> closed_session_list_;
EpollServer* epoll_server_; // Owned by the server.
// The connection for client-server communication
int fd_;
// True if the session is write blocked due to the socket returning EAGAIN.
// False if we have gotten a call to OnCanWrite after the last failed write.
bool write_blocked_;
// The helper used for all connections.
scoped_ptr<QuicEpollConnectionHelper> helper_;
// The writer to write to the socket with.
scoped_ptr<QuicPacketWriter> writer_;
DISALLOW_COPY_AND_ASSIGN(QuicDispatcher);
};
} // namespace tools
} // namespace net
#endif // NET_TOOLS_QUIC_QUIC_DISPATCHER_H_
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