src/libs/ec/cpp/ECSocket.h

   1 //
   2 // This file is part of the aMule Project.
   3 //
   4 // Copyright (c) 2004-2008 aMule Team ( admin@amule.org / http://www.amule.org )
   5 // Copyright (c) 2004-2008 Angel Vidal Veiga ( kry@users.sourceforge.net )
   6 //
   7 // Any parts of this program derived from the xMule, lMule or eMule project,
   8 // or contributed by third-party developers are copyrighted by their
   9 // respective authors.
  10 //
  11 // This program is free software; you can redistribute it and/or modify
  12 // it under the terms of the GNU General Public License as published by
  13 // the Free Software Foundation; either version 2 of the License, or
  14 // (at your option) any later version.
  15 //
  16 // This program is distributed in the hope that it will be useful,
  17 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 // GNU General Public License for more details.
  20 //
  21 // You should have received a copy of the GNU General Public License
  22 // along with this program; if not, write to the Free Software
  23 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
  24 //
  25
  26 #ifndef ECSOCKET_H
  27 #define ECSOCKET_H
  28
  29
  30 #include <deque>        // Needed for std::deque
  31 #include <memory>       // Needed for std::auto_ptr     // Do_not_auto_remove (mingw-gcc-3.4.5)
  32 #include <string>
  33 #include <vector>
  34
  35 #include <zlib.h>       // Needed for packet (de)compression
  36 #include "../../../Types.h"     // Needed for uint32_t
  37
  38 #include <wx/defs.h>    // Needed for wx/debug.h
  39 #include <wx/debug.h>   // Needed for wxASSERT
  40
  41 enum ECSocketErrors {
  42         EC_ERROR_NOERROR,
  43         EC_ERROR_INVOP,
  44         EC_ERROR_IOERR,
  45         EC_ERROR_INVADDR,
  46         EC_ERROR_INVSOCK,
  47         EC_ERROR_NOHOST,
  48         EC_ERROR_INVPORT,
  49         EC_ERROR_WOULDBLOCK,
  50         EC_ERROR_TIMEDOUT,
  51         EC_ERROR_MEMERR,
  52         EC_ERROR_DUMMY,
  53         EC_ERROR_UNKNOWN
  54 };
  55
  56 class CECPacket;
  57 class CQueuedData;
  58
  59 /*! \class CECSocket
  60  *
  61  * \brief Socket handler for External Communications (EC).
  62  *
  63  * CECSocket takes care of the transmission of EC packets
  64  */
  65
  66 class CECSocket{
  67         friend class CECPacket;
  68         friend class CECTag;
  69
  70 private:
  71         static const unsigned int EC_SOCKET_BUFFER_SIZE = 2048;
  72         const bool m_use_events;
  73
  74         // Output related data
  75         std::deque<CQueuedData *> m_output_queue;
  76
  77         // zlib (deflation) buffers
  78         std::vector<unsigned char> m_in_ptr;
  79         std::vector<unsigned char> m_out_ptr;
  80         std::auto_ptr<CQueuedData> m_curr_rx_data;
  81         std::auto_ptr<CQueuedData> m_curr_tx_data;
  82
  83         // This transfer only
  84         uint32_t m_rx_flags;
  85         uint32_t m_tx_flags;
  86         uint32_t m_my_flags;
  87         size_t m_bytes_needed;
  88         bool m_in_header;
  89
  90
  91         uint32_t m_curr_packet_len;
  92         z_stream m_z;
  93
  94 public:
  95         CECSocket(bool use_events);
  96         virtual ~CECSocket();
  97
  98         bool ConnectSocket(uint32_t ip, uint16_t port);
  99
 100         void CloseSocket() { InternalClose(); }
 101
 102         /**
 103          * Sends an EC packet and returns immediately.
 104          *
 105          * @param packet The CECPacket packet to be sent.
 106          *
 107          * This is an asynchronous call, the function returns
 108          * immediately and the packet is sent on idle time.
 109          *
 110          * @note It's the caller's responsibilty to \c delete
 111          * the \e packet.
 112          */
 113         void SendPacket(const CECPacket *packet);
 114
 115         /**
 116          * Sends an EC packet and waits for a reply.
 117          *
 118          * @param request The CECPacket packet to be sent.
 119          * @return The reply packet for the request.
 120          *
 121          * Unlike SendPacket(), this call is synchronous and blocking.
 122          * The packet is sent immediately (or at least as soon as possible),
 123          * and the function does not return until a reply is received,
 124          * or a timeout encountered.
 125          *
 126          * The returned packet will be allocated on the heap with \c new,
 127          * or \c NULL is returned in case of an error (timeout).
 128          *
 129          * @note It's the caller's responsibilty to \c delete both
 130          * request and reply.
 131          *
 132          * @note OnPacketReceived() won't be called for packets
 133          * received via this function.
 134          */
 135         const CECPacket *SendRecvPacket(const CECPacket *request);
 136
 137         /**
 138          * Event handler function called when a new packet is received.
 139          *
 140          * @param packet The packet that has been received.
 141          * @return The reply packet or \c NULL if no reply needed.
 142          *
 143          * In this function the application should process the received
 144          * packet, and create a reply if necessary. The reply must be allocated
 145          * on the heap with \c new. If no reply is necessary, the return
 146          * value of the function should be \c NULL. The library will \c delete
 147          * both packets.
 148          *
 149          * @note This function won't be called for packets received via the
 150          * SendRecvPacket() function.
 151          */
 152         virtual const CECPacket *OnPacketReceived(const CECPacket *packet);
 153
 154         /**
 155          * Get a message describing the error.
 156          *
 157          * @param error The code of the error for which a message should be returned.
 158          * @return The text descibing the error.
 159          */
 160         virtual std::string     GetLastErrorMsg();
 161
 162         /**
 163          * Error handler.
 164          *
 165          * This function is called when an error occurs. Use GetLastError() and
 166          * GetErrorMsg() to find out the nature of the error.
 167          *
 168          * The default error handler prints out an error message in debug builds,
 169          * and destroys the socket.
 170          */
 171         virtual void OnError();
 172
 173
 174         /**
 175          * Socket lost event handler.
 176          *
 177          * This function is called when the socket is lost (either because of a network
 178          * failure or because the remote end closed the socket gracefully).
 179          *
 180          * The default handler destroys the socket.
 181          */
 182         virtual void OnLost();
 183
 184         /**
 185          * Event handler for connection events.
 186          *
 187          * This function is called when a connection attempt succeeds. When CECSocket
 188          * is compiled with ECSOCKET_USE_EVENTS == 0, WaitOnConnect() should be called
 189          * for this to work.
 190          */
 191         virtual void OnConnect();
 192
 193         void OnInput();
 194         void OnOutput();
 195
 196         bool WouldBlock() { return InternalGetLastError() == EC_ERROR_WOULDBLOCK; }
 197         bool GotError() { return InternalGetLastError() != EC_ERROR_NOERROR; }
 198
 199         void SocketRead(void* ptr, size_t len) { InternalRead(ptr,len); }
 200         void SocketWrite(const void* ptr, size_t len) { InternalWrite(ptr,len); }
 201         bool SocketError() { return InternalError() && GotError(); }
 202
 203         size_t GetLastCount() { return InternalLastCount(); }
 204         bool WaitSocketConnect(long secs = -1, long msecs = 0) { return InternalWaitOnConnect(secs,msecs); }
 205         bool WaitSocketWrite(long secs = -1, long msecs = 0) { return InternalWaitForWrite(secs,msecs); }
 206         bool WaitSocketRead(long secs = -1, long msecs = 0) { return InternalWaitForRead(secs,msecs); }
 207
 208         bool IsSocketConnected() { return InternalIsConnected(); }
 209
 210         void DestroySocket() { return InternalDestroy(); }
 211
 212  private:
 213         const CECPacket *ReadPacket();
 214         void WritePacket(const CECPacket *packet);
 215
 216         // These 4 methods are to be used by CECPacket & CECTag
 217         bool    ReadNumber(void *buffer, size_t len);
 218         bool    ReadBuffer(void *buffer, size_t len);
 219
 220         bool    WriteNumber(const void *buffer, size_t len);
 221         bool    WriteBuffer(const void *buffer, size_t len);
 222
 223         // Internal stuff
 224         bool    FlushBuffers();
 225
 226         size_t  ReadBufferFromSocket(void *buffer, size_t len);
 227         void    WriteBufferToSocket(const void *buffer, size_t len);
 228
 229         /* virtuals */
 230                 virtual bool InternalConnect(uint32_t ip, uint16_t port, bool wait) = 0;
 231
 232                 virtual size_t InternalLastCount() = 0;
 233                 virtual bool InternalWaitOnConnect(long secs = -1, long msecs = 0) = 0;
 234                 virtual bool InternalWaitForWrite(long secs = -1, long msecs = 0) = 0;
 235                 virtual bool InternalWaitForRead(long secs = -1, long msecs = 0) = 0;
 236
 237                 virtual int InternalGetLastError() = 0;
 238
 239                 virtual void InternalClose() = 0;
 240                 virtual bool InternalError() = 0;
 241                 virtual void InternalRead(void* ptr, size_t len) = 0;
 242                 virtual void InternalWrite(const void* ptr, size_t len) = 0;
 243
 244                 virtual bool InternalIsConnected() = 0;
 245                 virtual void InternalDestroy() = 0;
 246 };
 247
 248
 249 class CQueuedData
 250 {
 251         std::vector<unsigned char> m_data;
 252         unsigned char *m_rd_ptr, *m_wr_ptr;
 253 public:
 254         CQueuedData(size_t len)
 255         :
 256         m_data(len)
 257         {
 258                 m_rd_ptr = m_wr_ptr = &m_data[0];
 259         }
 260
 261         ~CQueuedData() {}
 262
 263         void Rewind()
 264         {
 265                 m_rd_ptr = m_wr_ptr = &m_data[0];
 266         }
 267
 268         void Write(const void *data, size_t len);
 269         void WriteAt(const void *data, size_t len, size_t off);
 270         void Read(void *data, size_t len);
 271
 272         /*
 273          * Pass pointers to zlib. From now on, no Read() calls are allowed
 274          */
 275         void ToZlib(z_stream &m_z)
 276         {
 277                 m_z.avail_in = (uInt)GetUnreadDataLength();
 278                 m_z.next_in = m_rd_ptr;
 279         }
 280
 281         void WriteToSocket(CECSocket *sock);
 282         void ReadFromSocket(CECSocket *sock, size_t len);
 283
 284         size_t ReadFromSocketAll(CECSocket *sock, size_t len);
 285
 286         size_t GetLength() const;
 287         size_t GetDataLength() const;
 288         size_t GetRemLength() const;
 289         size_t GetUnreadDataLength() const;
 290 };
 291
 292 #endif // ECSOCKET_H