uploadmanager.h

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/*
 * Copyright (C) 2001-2006 Jacek Sieka, arnetheduck on gmail point com
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#if !defined(UPLOAD_MANAGER_H)
#define UPLOAD_MANAGER_H

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include "UserConnection.h"
#include "Singleton.h"

#include "ClientManagerListener.h"
#include <deque>
#include "File.h"
#include "MerkleTree.h"

class Upload : public Transfer, public Flags {
public:
	enum Flags {
		FLAG_USER_LIST = 0x01,
		FLAG_TTH_LEAVES = 0x02,
		FLAG_ZUPLOAD = 0x04,
		FLAG_PARTIAL_LIST = 0x08
	};

	typedef Upload* Ptr;
	typedef vector<Ptr> List;
	typedef List::iterator Iter;
	
	Upload() : tth(NULL), file(NULL) { }
	virtual ~Upload() { 
		delete file;
		delete tth;
	}
	
	User::Ptr& getUser() { dcassert(getUserConnection() != NULL); return getUserConnection()->getUser(); }
	
	GETSET(string, fileName, FileName);
	GETSET(string, localFileName, LocalFileName);
	GETSET(TTHValue*, tth, TTH);
	GETSET(InputStream*, file, File);
};

class UploadManagerListener {
public:
	virtual ~UploadManagerListener() { }
	template<int I>	struct X { enum { TYPE = I };  };
	
	typedef X<0> Complete;
	typedef X<1> Failed;
	typedef X<2> Starting;
	typedef X<3> Tick;
	typedef X<4> WaitingAddFile;
	typedef X<5> WaitingRemoveUser;

	virtual void on(Starting, Upload*) throw() { }
	virtual void on(Tick, const Upload::List&) throw() { }
	virtual void on(Complete, Upload*) throw() { }
	virtual void on(Failed, Upload*, const string&) throw() { }
	virtual void on(WaitingAddFile, const User::Ptr, const string&) throw() { }
	virtual void on(WaitingRemoveUser, const User::Ptr) throw() { }

};

class UploadManager : private ClientManagerListener, private UserConnectionListener, public Speaker<UploadManagerListener>, private TimerManagerListener, public Singleton<UploadManager>
{
public:
	
	/** @return Number of uploads. */ 
	size_t getUploadCount() { Lock l(cs); return uploads.size(); }

	/**
	 * @remarks This is only used in the tray icons. Could be used in
	 * MainFrame too.
	 *
	 * @return Average download speed in Bytes/s
	 */
	int getAverageSpeed() {
		Lock l(cs);
		int avg = 0;
		for(Upload::Iter i = uploads.begin(); i != uploads.end(); ++i) {
			Upload* u = *i;
			avg += (int)u->getRunningAverage();
		}
		return avg;
	}
	
	/** @return Number of free slots. */
	int getFreeSlots() { return max((SETTING(SLOTS) - running), 0); }
	
	/** @internal */
	bool getAutoSlot() {
		/** A 0 in settings means disable */
		if(SETTING(MIN_UPLOAD_SPEED) == 0)
			return false;
		/** Only grant one slot per 30 sec */
		if(GET_TICK() < getLastGrant() + 30*1000)
			return false;
		/** Grant if upload speed is less than the threshold speed */
		return getAverageSpeed() < (SETTING(MIN_UPLOAD_SPEED)*1024);
	}

	/** @internal */
	int getFreeExtraSlots() { return max(3 - getExtra(), 0); }
	
	/** @param aUser Reserve an upload slot for this user and connect. */
	void reserveSlot(const User::Ptr& aUser);

	typedef set<string> FileSet;
	typedef hash_map<User::Ptr, FileSet, User::HashFunction> FilesMap;
	void clearUserFiles(const User::Ptr&);
	vector<User::Ptr> getWaitingUsers();
	const FileSet& getWaitingUserFiles(const User::Ptr &);

	/** @internal */
	void addConnection(UserConnection::Ptr conn) {
		conn->addListener(this);
		conn->setState(UserConnection::STATE_GET);
	}

	GETSET(int, running, Running);
	GETSET(int, extra, Extra);
	GETSET(u_int32_t, lastGrant, LastGrant);
private:
	Upload::List uploads;
	CriticalSection cs;

	typedef HASH_SET<User::Ptr, User::HashFunction> SlotSet;
	typedef SlotSet::iterator SlotIter;
	SlotSet reservedSlots;

	typedef pair<User::Ptr, u_int32_t> WaitingUser;
	typedef deque<WaitingUser> UserDeque;

	struct UserMatch {
		UserMatch(const User::Ptr& u) : u(u) { }
		User::Ptr u;
		bool operator()(const WaitingUser& wu) { return wu.first == u; }
	};

	struct WaitingUserFresh {
		bool operator()(const WaitingUser& wu) { return wu.second > GET_TICK() - 5*60*1000; }
	};

	//functions for manipulating waitingFiles and waitingUsers
	UserDeque waitingUsers;		//this one merely lists the users waiting for slots
	FilesMap waitingFiles;		//set of files which this user has asked for
	void addFailedUpload(UserConnection::Ptr source, string filename);

	friend class Singleton<UploadManager>;
	UploadManager() throw();
	virtual ~UploadManager() throw();

	void removeConnection(UserConnection::Ptr aConn);
	void removeUpload(Upload* aUpload);

	// ClientManagerListener
	virtual void on(ClientManagerListener::UserDisconnected, const User::Ptr& aUser) throw();
	
	// TimerManagerListener
	virtual void on(TimerManagerListener::Second, u_int32_t aTick) throw();
	virtual void on(TimerManagerListener::Minute, u_int32_t aTick) throw();

	// UserConnectionListener
	virtual void on(BytesSent, UserConnection*, size_t, size_t) throw();
	virtual void on(Failed, UserConnection*, const string&) throw();
	virtual void on(Get, UserConnection*, const string&, int64_t) throw();
	virtual void on(GetBlock, UserConnection* conn, const string& line, int64_t resume, int64_t bytes) throw() { onGetBlock(conn, line, resume, bytes, false); }
	virtual void on(GetZBlock, UserConnection* conn, const string& line, int64_t resume, int64_t bytes) throw() { onGetBlock(conn, line, resume, bytes, true); }
	virtual void on(Send, UserConnection*) throw();
	virtual void on(GetListLength, UserConnection* conn) throw();
	virtual void on(TransmitDone, UserConnection*) throw();
	
	virtual void on(AdcCommand::GET, UserConnection*, const AdcCommand&) throw();
	virtual void on(AdcCommand::GFI, UserConnection*, const AdcCommand&) throw();

	void onGetBlock(UserConnection* aSource, const string& aFile, int64_t aResume, int64_t aBytes, bool z);
	bool prepareFile(UserConnection* aSource, const string& aType, const string& aFile, int64_t aResume, int64_t aBytes, bool listRecursive = false);
};

#endif // !defined(UPLOAD_MANAGER_H)