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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/basictypes.h"
#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_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 QuicConnectionHelper;
class QuicCryptoServerConfig;
class QuicSession;
namespace tools {
class QuicPacketWriterWrapper;
namespace test {
class QuicDispatcherPeer;
} // namespace test
class DeleteSessionsAlarm;
class QuicEpollConnectionHelper;
class QuicDispatcher : public QuicServerSessionVisitor {
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. |supported_versions| specifies the
// list of supported QUIC versions.
QuicDispatcher(const QuicConfig& config,
const QuicCryptoServerConfig& crypto_config,
const QuicVersionVector& supported_versions,
EpollServer* epoll_server);
virtual ~QuicDispatcher();
void Initialize(int fd);
// Process the incoming packet by creating a new session, passing it to
// an existing session, or passing it to the TimeWaitListManager.
virtual void ProcessPacket(const IPEndPoint& server_address,
const IPEndPoint& client_address,
const QuicEncryptedPacket& packet);
// Called when the socket becomes writable to allow queued writes to happen.
virtual void OnCanWrite();
// Returns true if there's anything in the blocked writer list.
virtual bool HasPendingWrites() const;
// Sends ConnectionClose frames to all connected clients.
void Shutdown();
// QuicServerSessionVisitor interface implementation:
// Ensure that the closed connection is cleaned up asynchronously.
virtual void OnConnectionClosed(QuicConnectionId connection_id,
QuicErrorCode error) OVERRIDE;
// Queues the blocked writer for later resumption.
virtual void OnWriteBlocked(QuicBlockedWriterInterface* writer) OVERRIDE;
typedef base::hash_map<QuicConnectionId, QuicSession*> SessionMap;
// Deletes all sessions on the closed session list and clears the list.
void DeleteSessions();
const SessionMap& session_map() const { return session_map_; }
WriteBlockedList* write_blocked_list() { return &write_blocked_list_; }
protected:
// Instantiates a new low-level packet writer. Caller takes ownership of the
// returned object.
QuicPacketWriter* CreateWriter(int fd);
// Instantiates a new top-level writer wrapper. Takes ownership of |writer|.
// Caller takes ownership of the returned object.
virtual QuicPacketWriterWrapper* CreateWriterWrapper(
QuicPacketWriter* writer);
virtual QuicSession* CreateQuicSession(QuicConnectionId connection_id,
const IPEndPoint& server_address,
const IPEndPoint& client_address);
QuicConnection* CreateQuicConnection(QuicConnectionId connection_id,
const IPEndPoint& server_address,
const IPEndPoint& client_address);
// Replaces the packet writer with |writer|. Takes ownership of |writer|.
void set_writer(QuicPacketWriter* writer);
QuicTimeWaitListManager* time_wait_list_manager() {
return time_wait_list_manager_.get();
}
EpollServer* epoll_server() { return epoll_server_; }
const QuicVersionVector& supported_versions() const {
return supported_versions_;
}
// Called by |framer_visitor_| when the public header has been parsed.
virtual bool OnUnauthenticatedPublicHeader(
const QuicPacketPublicHeader& header);
const IPEndPoint& current_server_address() {
return current_server_address_;
}
const QuicEncryptedPacket& current_packet() {
return *current_packet_;
}
const QuicConfig& config() const { return config_; }
const QuicCryptoServerConfig& crypto_config() const { return crypto_config_; }
private:
class QuicFramerVisitor;
friend class net::tools::test::QuicDispatcherPeer;
// Called by |framer_visitor_| when the private header has been parsed
// of a data packet that is destined for the time wait manager.
void OnUnauthenticatedHeader(const QuicPacketHeader& header);
// Removes the session from the session map and write blocked list, and
// adds the ConnectionId to the time-wait list.
void CleanUpSession(SessionMap::iterator it);
bool HandlePacketForTimeWait(const QuicPacketPublicHeader& header);
const QuicConfig& config_;
const QuicCryptoServerConfig& crypto_config_;
// The list of connections waiting to write.
WriteBlockedList write_blocked_list_;
SessionMap session_map_;
// Entity that manages connection_ids 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 helper used for all connections.
scoped_ptr<QuicEpollConnectionHelper> helper_;
// The writer to write to the socket with. We require a writer wrapper to
// allow replacing writer implementation without disturbing running
// connections.
scoped_ptr<QuicPacketWriterWrapper> writer_;
// This vector contains QUIC versions which we currently support.
// This should be ordered such that the highest supported version is the first
// element, with subsequent elements in descending order (versions can be
// skipped as necessary).
const QuicVersionVector supported_versions_;
// Information about the packet currently being handled.
IPEndPoint current_client_address_;
IPEndPoint current_server_address_;
const QuicEncryptedPacket* current_packet_;
QuicFramer framer_;
scoped_ptr<QuicFramerVisitor> framer_visitor_;
DISALLOW_COPY_AND_ASSIGN(QuicDispatcher);
};
} // namespace tools
} // namespace net
#endif // NET_TOOLS_QUIC_QUIC_DISPATCHER_H_
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