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 
00055     _is_connected = ESP8266->start(ESP_TCP_TYPE,_ipAddress,_port);
00056     if(_is_connected) { //success
00057         return 0;
00058     } else { // fail
00059         return -1;
00060     }
00061 }
00062 
00063 bool TCPSocketConnection::is_connected(void)
00064 {
00065     return _is_connected;
00066 }
00067 
00068 int TCPSocketConnection::send(char* data, int length)
00069 {
00070     if (!_is_connected) {
00071         ERR("TCPSocketConnection::receive() - _is_connected is false : you cant receive data until you connect to a socket!");
00072         return -1;
00073     }
00074     Timer tmr;
00075     int idx = 0;
00076     tmr.start();
00077     while ((tmr.read_ms() < _timeout) || _blocking) {
00078 
00079         idx += wifi->send(data, length);
00080 
00081         if (idx == length)
00082             return idx;
00083     }
00084     return (idx == 0) ? -1 : idx;
00085 
00086     //return wifi->send(data,length);
00087 //
00088 //    if (!_blocking) {
00089 //        TimeInterval timeout(_timeout);
00090 //        if (wait_writable(timeout) != 0)
00091 //            return -1;
00092 //    }
00093 //
00094 //    int n = lwip_send(_sock_fd, data, length, 0);
00095 //    _is_connected = (n != 0);
00096 //
00097 //    return n;
00098 
00099 }
00100 
00101 // -1 if unsuccessful, else number of bytes written
00102 int TCPSocketConnection::send_all(char* data, int length)
00103 {
00104 //   if ((_sock_fd < 0) || !_is_connected)
00105 //        return -1;
00106 //
00107 //    int writtenLen = 0;
00108 //    TimeInterval timeout(_timeout);
00109 //    while (writtenLen < length) {
00110 //        if (!_blocking) {
00111 //            // Wait for socket to be writeable
00112 //            if (wait_writable(timeout) != 0)
00113 //                return writtenLen;
00114 //        }
00115 //
00116 //        int ret = lwip_send(_sock_fd, data + writtenLen, length - writtenLen, 0);
00117 //        if (ret > 0) {
00118 //            writtenLen += ret;
00119 //            continue;
00120 //        } else if (ret == 0) {
00121 //            _is_connected = false;
00122 //            return writtenLen;
00123 //        } else {
00124 //            return -1; //Connnection error
00125 //        }
00126 //    }
00127 //    return writtenLen;
00128     return send(data,length); // just remap to send
00129 }
00130 
00131 int TCPSocketConnection::receive(char* buffer, int length)
00132 {
00133     if (!_is_connected) {
00134         ERR("TCPSocketConnection::receive() - _is_connected is false : you cant receive data until you connect to a socket!");
00135         return -1;
00136     }
00137     Timer tmr;
00138     int idx = 0;
00139     int nb_available = 0;
00140     int time = -1;
00141 
00142     //make this the non-blocking case and return if <= 0
00143     // remember to change the config to blocking
00144     // if ( ! _blocking) {
00145     // if ( wifi.readable <= 0 ) {
00146     // return (wifi.readable);
00147     // }
00148     // }
00149     //---
00150     tmr.start();
00151     if (_blocking) {
00152         while (1) {
00153             nb_available = wifi->readable();
00154             if (nb_available != 0) {
00155                 break;
00156             }
00157         }
00158     }
00159     //---
00160     // blocking case
00161     else {
00162         tmr.reset();
00163 
00164         while (time < _timeout) {
00165             nb_available = wifi->readable();
00166             if (nb_available < 0) return nb_available;
00167             if (nb_available > 0) break ;
00168             time = tmr.read_ms();
00169         }
00170 
00171         if (nb_available == 0) return nb_available;
00172     }
00173 
00174     // change this to < 20 mS timeout per byte to detect end of packet gap
00175     // this may not work due to buffering at the UART interface
00176     tmr.reset();
00177     // while ( tmr.read_ms() < 20 ) {
00178     // if ( wifi.readable() && (idx < length) ) {
00179     // buffer[idx++] = wifi->getc();
00180     // tmr.reset();
00181     // }
00182     // if ( idx == length ) {
00183     // break;
00184     // }
00185     // }
00186     //---
00187     while (time < _timeout) {
00188 
00189         nb_available = wifi->readable();
00190         //for (int i = 0; i < min(nb_available, length); i++) {
00191         for (int i = 0; i < min(nb_available, (length-idx)); i++) {
00192             buffer[idx] = wifi->getc();
00193             idx++;
00194         }
00195         if (idx == length) {
00196             break;
00197         }
00198         time = tmr.read_ms();
00199     }
00200     //---
00201     return (idx == 0) ? -1 : idx;
00202 
00203 //************************ original code below
00204 //
00205 //    if (!_blocking) {
00206 //        TimeInterval timeout(_timeout);
00207 //        if (wait_readable(timeout) != 0)
00208 //            return -1;
00209 //    }
00210 //
00211 //    int n = lwip_recv(_sock_fd, data, length, 0);
00212 //    _is_connected = (n != 0);
00213 //
00214 //    return n;
00215 
00216 }
00217 
00218 // -1 if unsuccessful, else number of bytes received
00219 int TCPSocketConnection::receive_all(char* data, int length)
00220 {
00221     //ERR("receive_all() not yet implimented");
00222     //  if ((_sock_fd < 0) || !_is_connected)
00223 //        return -1;
00224 //
00225 //    int readLen = 0;
00226 //    TimeInterval timeout(_timeout);
00227 //    while (readLen < length) {
00228 //        if (!_blocking) {
00229 //            //Wait for socket to be readable
00230 //            if (wait_readable(timeout) != 0)
00231 //                return readLen;
00232 //        }
00233 //
00234 //        int ret = lwip_recv(_sock_fd, data + readLen, length - readLen, 0);
00235 //        if (ret > 0) {
00236 //            readLen += ret;
00237 //        } else if (ret == 0) {
00238 //            _is_connected = false;
00239 //            return readLen;
00240 //        } else {
00241 //            return -1; //Connnection error
00242 //        }
00243 //    }
00244 //    return readLen;
00245     receive(data,length);
00246 }