| 1 | /*************************************************************************** |
| 2 | * Copyright (C) 2006 by Gerd v. Egidy * |
| 3 | * gve@intra2net.com * |
| 4 | * * |
| 5 | * This library is free software; you can redistribute it and/or modify * |
| 6 | * it under the terms of the GNU Lesser General Public License version * |
| 7 | * 2.1 as published by the Free Software Foundation. * |
| 8 | * * |
| 9 | * This library is distributed in the hope that it will be useful, * |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
| 12 | * GNU Lesser General Public License for more details. * |
| 13 | * * |
| 14 | * You should have received a copy of the GNU Lesser General Public * |
| 15 | * License along with this program; if not, write to the * |
| 16 | * Free Software Foundation, Inc., * |
| 17 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * |
| 18 | ***************************************************************************/ |
| 19 | #ifndef __LIBT2N_CONNECTION |
| 20 | #define __LIBT2N_CONNECTION |
| 21 | |
| 22 | #include <string> |
| 23 | |
| 24 | #include <netinet/in.h> |
| 25 | |
| 26 | #include "types.hxx" |
| 27 | |
| 28 | namespace libt2n |
| 29 | { |
| 30 | |
| 31 | /** @brief a connection between client and server. abstact. |
| 32 | */ |
| 33 | class connection |
| 34 | { |
| 35 | private: |
| 36 | bool closed; |
| 37 | |
| 38 | protected: |
| 39 | connection() |
| 40 | { closed=false; } |
| 41 | |
| 42 | std::string buffer; |
| 43 | |
| 44 | typedef uint32_t packet_size_indicator; |
| 45 | |
| 46 | packet_size_indicator bytes_available(); |
| 47 | |
| 48 | virtual void real_write(const std::string& data)=0; |
| 49 | |
| 50 | virtual std::ostream* get_logstream(log_level_values level)=0; |
| 51 | |
| 52 | public: |
| 53 | virtual ~connection() |
| 54 | { close(); } |
| 55 | |
| 56 | /// is this connection closed or not |
| 57 | bool is_closed() |
| 58 | { return closed; } |
| 59 | |
| 60 | /// close this connection |
| 61 | virtual void close() |
| 62 | { closed=true; } |
| 63 | |
| 64 | /** @brief look for new data and store it in the local buffer |
| 65 | @param usec_timeout wait until new data is found, max timeout usecs. |
| 66 | -1: wait endless |
| 67 | 0: return instantly |
| 68 | @param usec_timeout_remaining if non-NULL the function will write the |
| 69 | not used time to the given target |
| 70 | @retval true if new data was found (does not mean that the received data |
| 71 | is a complete packet though) |
| 72 | */ |
| 73 | virtual bool fill_buffer(long long usec_timeout=-1,long long* usec_timeout_remaining=NULL)=0; |
| 74 | |
| 75 | bool get_packet(std::string& data); |
| 76 | |
| 77 | unsigned int peek_packet(std::string& data); |
| 78 | |
| 79 | /// returns true if a complete data packet is in the buffer. retrieve it with get_packet(). |
| 80 | bool packet_available() |
| 81 | { return bytes_available(); } |
| 82 | |
| 83 | void write(const std::string& data); |
| 84 | }; |
| 85 | |
| 86 | } |
| 87 | |
| 88 | #endif |