TCPSocketConnection.cpp

00001 /* Copyright (C) 2012 mbed.org, MIT License
00002  *
00003  * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
00004  * and associated documentation files (the "Software"), to deal in the Software without restriction,
00005  * including without limitation the rights to use, copy, modify, merge, publish, distribute,
00006  * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
00007  * furnished to do so, subject to the following conditions:
00008  *
00009  * The above copyright notice and this permission notice shall be included in all copies or
00010  * substantial portions of the Software.
00011  *
00012  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
00013  * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00014  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
00015  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00016  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00017  */
00018 #include "TCPSocketConnection.h"
00019 #include <cstring>
00020 #include <algorithm>
00021 
00022 using std::memset;
00023 using std::memcpy;
00024 
00025 //Debug is disabled by default
00026 #if 1
00027 #define DBG(x, ...)  printf("[TCPConnection : DBG]"x" \t[%s,%d]\r\n", ##__VA_ARGS__,__FILE__,__LINE__); 
00028 #define WARN(x, ...) printf("[TCPConnection: WARN]"x" \t[%s,%d]\r\n", ##__VA_ARGS__,__FILE__,__LINE__); 
00029 #define ERR(x, ...)  printf("[TCPConnection : ERR]"x" \t[%s,%d]\r\n", ##__VA_ARGS__,__FILE__,__LINE__); 
00030 #else
00031 #define DBG(x, ...)
00032 #define WARN(x, ...)
00033 #define ERR(x, ...)
00034 #endif
00035 
00036 TCPSocketConnection::TCPSocketConnection() :
00037     _is_connected(false)
00038 {
00039 }
00040 
00041 int TCPSocketConnection::connect(const char* host, const int port)
00042 {
00043 //    if (init_socket(SOCK_STREAM) < 0)
00044 //        return -1;
00045 //
00046     if (set_address(host, port) != 0)
00047         return -1;
00048 //
00049 //    if (lwip_connect(_sock_fd, (const struct sockaddr *) &_remoteHost, sizeof(_remoteHost)) < 0) {
00050 //        close();
00051 //        return -1;
00052 //    }
00053 //    _is_connected = true;
00054     _is_connected = ESP8266->start(ESP_TCP_TYPE,_ipAddress,_port);
00055     if(_is_connected) { //success
00056         return 0;
00057     } else { // fail
00058         return -1;
00059     }
00060 }
00061 
00062 bool TCPSocketConnection::is_connected(void)
00063 {
00064     return _is_connected;
00065 }
00066 
00067 int TCPSocketConnection::send(char* data, int length)
00068 {
00069     if (!_is_connected) {
00070         ERR("TCPSocketConnection::receive() - _is_connected is false : you cant receive data until you connect to a socket!");
00071         return -1;
00072     }
00073     Timer tmr;
00074     int idx = 0;
00075     tmr.start();
00076     while ((tmr.read_ms() < _timeout) || _blocking) {
00077 
00078         idx += wifi->send(data, length);
00079 
00080         if (idx == length)
00081             return idx;
00082     }
00083     return (idx == 0) ? -1 : idx;
00084 
00085     //return wifi->send(data,length);
00086 //
00087 //    if (!_blocking) {
00088 //        TimeInterval timeout(_timeout);
00089 //        if (wait_writable(timeout) != 0)
00090 //            return -1;
00091 //    }
00092 //
00093 //    int n = lwip_send(_sock_fd, data, length, 0);
00094 //    _is_connected = (n != 0);
00095 //
00096 //    return n;
00097 
00098 }
00099 
00100 // -1 if unsuccessful, else number of bytes written
00101 int TCPSocketConnection::send_all(char* data, int length)
00102 {
00103 //   if ((_sock_fd < 0) || !_is_connected)
00104 //        return -1;
00105 //
00106 //    int writtenLen = 0;
00107 //    TimeInterval timeout(_timeout);
00108 //    while (writtenLen < length) {
00109 //        if (!_blocking) {
00110 //            // Wait for socket to be writeable
00111 //            if (wait_writable(timeout) != 0)
00112 //                return writtenLen;
00113 //        }
00114 //
00115 //        int ret = lwip_send(_sock_fd, data + writtenLen, length - writtenLen, 0);
00116 //        if (ret > 0) {
00117 //            writtenLen += ret;
00118 //            continue;
00119 //        } else if (ret == 0) {
00120 //            _is_connected = false;
00121 //            return writtenLen;
00122 //        } else {
00123 //            return -1; //Connnection error
00124 //        }
00125 //    }
00126 //    return writtenLen;
00127     return send(data,length); // just remap to send
00128 }
00129 
00130 int TCPSocketConnection::receive(char* buffer, int length)
00131 {
00132     if (!_is_connected) {
00133         ERR("TCPSocketConnection::receive() - _is_connected is false : you cant receive data until you connect to a socket!");
00134         return -1;
00135     }
00136     Timer tmr;
00137     int idx = 0;
00138     int nb_available = 0;
00139     int time = -1;
00140 
00141     //make this the non-blocking case and return if <= 0
00142     // remember to change the config to blocking
00143     // if ( ! _blocking) {
00144     // if ( wifi.readable <= 0 ) {
00145     // return (wifi.readable);
00146     // }
00147     // }
00148     //---
00149     tmr.start();
00150     if (_blocking) {
00151         while (1) {
00152             nb_available = wifi->readable();
00153             if (nb_available != 0) {
00154                 break;
00155             }
00156         }
00157     }
00158     //---
00159     // blocking case
00160     else {
00161         tmr.reset();
00162 
00163         while (time < _timeout) {
00164             nb_available = wifi->readable();
00165             if (nb_available < 0) return nb_available;
00166             if (nb_available > 0) break ;
00167             time = tmr.read_ms();
00168         }
00169 
00170         if (nb_available == 0) return nb_available;
00171     }
00172 
00173     // change this to < 20 mS timeout per byte to detect end of packet gap
00174     // this may not work due to buffering at the UART interface
00175     tmr.reset();
00176     // while ( tmr.read_ms() < 20 ) {
00177     // if ( wifi.readable() && (idx < length) ) {
00178     // buffer[idx++] = wifi->getc();
00179     // tmr.reset();
00180     // }
00181     // if ( idx == length ) {
00182     // break;
00183     // }
00184     // }
00185     //---
00186     while (time < _timeout) {
00187 
00188         nb_available = wifi->readable();
00189         //for (int i = 0; i < min(nb_available, length); i++) {
00190         for (int i = 0; i < min(nb_available, (length-idx)); i++) {
00191             buffer[idx] = wifi->getc();
00192             idx++;
00193         }
00194         if (idx == length) {
00195             break;
00196         }
00197         time = tmr.read_ms();
00198     }
00199     //---
00200     return (idx == 0) ? -1 : idx;
00201 
00202 //************************ original code below
00203 //
00204 //    if (!_blocking) {
00205 //        TimeInterval timeout(_timeout);
00206 //        if (wait_readable(timeout) != 0)
00207 //            return -1;
00208 //    }
00209 //
00210 //    int n = lwip_recv(_sock_fd, data, length, 0);
00211 //    _is_connected = (n != 0);
00212 //
00213 //    return n;
00214 
00215 }
00216 
00217 // -1 if unsuccessful, else number of bytes received
00218 int TCPSocketConnection::receive_all(char* data, int length)
00219 {
00220     //ERR("receive_all() not yet implimented");
00221     //  if ((_sock_fd < 0) || !_is_connected)
00222 //        return -1;
00223 //
00224 //    int readLen = 0;
00225 //    TimeInterval timeout(_timeout);
00226 //    while (readLen < length) {
00227 //        if (!_blocking) {
00228 //            //Wait for socket to be readable
00229 //            if (wait_readable(timeout) != 0)
00230 //                return readLen;
00231 //        }
00232 //
00233 //        int ret = lwip_recv(_sock_fd, data + readLen, length - readLen, 0);
00234 //        if (ret > 0) {
00235 //            readLen += ret;
00236 //        } else if (ret == 0) {
00237 //            _is_connected = false;
00238 //            return readLen;
00239 //        } else {
00240 //            return -1; //Connnection error
00241 //        }
00242 //    }
00243 //    return readLen;
00244     receive(data,length);
00245 }