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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.
*/
#ifndef __STUNREQUESTMANAGER_H__
#define __STUNREQUESTMANAGER_H__
#include "talk/base/sigslot.h"
#include "talk/base/thread.h"
#include "talk/p2p/base/stun.h"
#include <map>
#include <string>
namespace cricket {
class StunRequest;
// Manages a set of STUN requests, sending and resending until we receive a
// response or determine that the request has timed out.
class StunRequestManager {
public:
StunRequestManager(Thread* thread);
~StunRequestManager();
// Starts sending the given request (perhaps after a delay).
void Send(StunRequest* request);
void SendDelayed(StunRequest* request, int delay);
// Removes a stun request that was added previously. This will happen
// automatically when a request succeeds, fails, or times out.
void Remove(StunRequest* request);
// Removes all stun requests that were added previously.
void Clear();
// Determines whether the given message is a response to one of the
// outstanding requests, and if so, processes it appropriately.
bool CheckResponse(StunMessage* msg);
bool CheckResponse(const char* data, size_t size);
// Raised when there are bytes to be sent.
sigslot::signal2<const void*, size_t> SignalSendPacket;
private:
typedef std::map<std::string, StunRequest*> RequestMap;
Thread* thread_;
RequestMap requests_;
friend class StunRequest;
};
// Represents an individual request to be sent. The STUN message can either be
// constructed beforehand or built on demand.
class StunRequest : public MessageHandler {
public:
StunRequest();
StunRequest(StunMessage* request);
virtual ~StunRequest();
// The manager handling this request (if it has been scheduled for sending).
StunRequestManager* manager() { return manager_; }
// Returns the transaction ID of this request.
const std::string& id() { return id_; }
// Returns the STUN type of the request message.
const StunMessageType type();
// Handles messages for sending and timeout.
void OnMessage(Message* pmsg);
// Time elapsed since last send (in ms)
uint32 Elapsed() const;
protected:
int count_;
bool timeout_;
// Fills in the actual request to be sent. Note that the transaction ID will
// already be set and cannot be changed.
virtual void Prepare(StunMessage* request) {}
// Called when the message receives a response or times out.
virtual void OnResponse(StunMessage* response) {}
virtual void OnErrorResponse(StunMessage* response) {}
virtual void OnTimeout() {}
virtual int GetNextDelay();
private:
StunRequestManager* manager_;
std::string id_;
StunMessage* msg_;
uint32 tstamp_;
void set_manager(StunRequestManager* manager);
friend class StunRequestManager;
};
} // namespace cricket
#endif // __STUNREQUESTMANAGER_H__
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