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/*
* libjingle
* Copyright 2004--2005, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// P2PSocket wraps up the state management of the connection between two
// P2P clients. Clients have candidate ports for connecting, and connections
// which are combinations of candidates from each end (Alice and Bob each
// have candidates, one candidate from Alice and one candidate from Bob are
// used to make a connection, repeat to make many connections).
//
// When all of the available connections become invalid (non-writable), we
// kick off a process of determining more candidates and more connections.
//
#ifndef _CRICKET_P2P_BASE_P2PSOCKET_H_
#define _CRICKET_P2P_BASE_P2PSOCKET_H_
#include <vector>
#include <string>
#include "talk/base/sigslot.h"
#include "talk/p2p/base/candidate.h"
#include "talk/p2p/base/port.h"
#include "talk/p2p/base/portallocator.h"
namespace cricket {
// Adds the port on which the candidate originated.
class RemoteCandidate: public Candidate {
public:
RemoteCandidate(const Candidate& c, Port* origin_port)
: Candidate(c), origin_port_(origin_port) {}
Port* origin_port() { return origin_port_; }
private:
Port* origin_port_;
};
// P2PSocket manages the candidates and connection process to keep two P2P
// clients connected to each other.
class P2PSocket : public MessageHandler, public sigslot::has_slots<> {
public:
enum State {
STATE_CONNECTING = 0, // establishing writability
STATE_WRITABLE, // connected - ready for writing
};
P2PSocket(const std::string &name, PortAllocator *allocator);
virtual ~P2PSocket();
// Typically SocketManager calls these
const std::string &name() const;
void StartProcessingCandidates();
void AddRemoteCandidates(const std::vector<Candidate> &remote_candidates);
void OnSignalingReady();
void Reset();
// Typically the Session Client calls these
int Send(const char *data, size_t len);
int SetOption(Socket::Option opt, int value);
int GetError();
State state();
bool writable();
const std::vector<Connection *>& connections();
Connection* best_connection() { return best_connection_; }
Thread *thread();
sigslot::signal2<P2PSocket *, State> SignalState;
sigslot::signal0<> SignalRequestSignaling;
sigslot::signal3<P2PSocket *, const char *, size_t> SignalReadPacket;
sigslot::signal2<P2PSocket *, const SocketAddress &> SignalConnectionChanged;
sigslot::signal2<P2PSocket *, const std::vector<Candidate>&>
SignalCandidatesReady;
sigslot::signal1<P2PSocket *> SignalConnectionMonitor;
// Handler for internal messages.
virtual void OnMessage(Message *pmsg);
private:
void set_state(State state);
void UpdateConnectionStates();
void RequestSort();
void SortConnections();
void SwitchBestConnectionTo(Connection* conn);
void HandleWritable();
void HandleNotWritable();
void HandleAllTimedOut();
Connection* GetBestConnectionOnNetwork(Network* network);
bool CreateConnections(const Candidate &remote_candidate, Port* origin_port,
bool readable);
bool CreateConnection(Port* port, const Candidate& remote_candidate,
Port* origin_port, bool readable);
void RememberRemoteCandidate(const Candidate& remote_candidate,
Port* origin_port);
void OnUnknownAddress(Port *port, const SocketAddress &addr,
StunMessage *stun_msg,
const std::string &remote_username);
void OnPortReady(PortAllocatorSession *session, Port* port);
void OnCandidatesReady(PortAllocatorSession *session,
const std::vector<Candidate>& candidates);
void OnConnectionStateChange(Connection *connection);
void OnConnectionDestroyed(Connection *connection);
void OnPortDestroyed(Port* port);
void OnAllocate();
void OnReadPacket(Connection *connection, const char *data, size_t len);
void OnSort();
void OnPing();
bool IsPingable(Connection* conn);
Connection* FindNextPingableConnection();
uint32 NumPingableConnections();
PortAllocatorSession* allocator_session() {
return allocator_sessions_.back();
}
void AddAllocatorSession(PortAllocatorSession* session);
Thread *worker_thread_;
State state_;
bool waiting_for_signaling_;
int error_;
std::string name_;
PortAllocator *allocator_;
std::vector<PortAllocatorSession*> allocator_sessions_;
std::vector<Port *> ports_;
std::vector<Connection *> connections_;
Connection *best_connection_;
std::vector<RemoteCandidate> remote_candidates_;
bool pinging_started_; // indicates whether StartGetAllCandidates has been called
bool sort_dirty_; // indicates whether another sort is needed right now
bool was_writable_;
bool was_timed_out_;
typedef std::map<Socket::Option, int> OptionMap;
OptionMap options_;
DISALLOW_EVIL_CONSTRUCTORS(P2PSocket);
};
} // namespace cricket
#endif // _CRICKET_P2P_BASE_P2PSOCKET_H_
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