http_server.cpp

00001 /*********************************************************************
00002 *
00003 * Simple HTTP Server library
00004 * 
00005 * Mauricio Martins Donatti
00006 * mauricio.donatti@lnls.br
00007 *
00008 * Electronics Instrumentation Group - GIE
00009 * Brazilian Synchrotron Light Laboratory (LNLS)
00010 * Brazilian Center for Research in Energy and Materials (CNPEM)
00011 *
00012 * March 2020
00013 *
00014 *******************************************************************/
00015 
00016 #include "http_server.h"
00017 
00018 char c; //aux variable
00019 
00020 HttpServer::HttpServer()
00021 {
00022     buffer[0] = '\0';   //constructor    
00023 }
00024 
00025 HttpServer::~HttpServer()
00026 {
00027 }
00028 bool HttpServer::init(EthernetInterface* eth,char *file,int file_size)
00029 {
00030     HTTP_PRINTF("DEBUG MODE");
00031     
00032     html_file = file;
00033     html_size = file_size;
00034     
00035     if(socket.open(eth)==NSAPI_ERROR_OK)
00036         HTTP_PRINTF("Socket Opened\n\r");
00037     else
00038         HTTP_PRINTF("Error opening socket\n\r");
00039 
00040     if(socket.bind(80)==NSAPI_ERROR_OK)
00041         HTTP_PRINTF("Socket Bind Success\n\r");
00042     else
00043         HTTP_PRINTF("Bind Error\n\r");
00044 
00045     if(socket.listen(QUEUED_REQUESTS)==NSAPI_ERROR_OK)
00046         HTTP_PRINTF("Socket Listen Success\n\r");
00047     else
00048         HTTP_PRINTF("Listen Error\n\r");
00049         
00050     return true;
00051 }
00052 
00053 bool HttpServer::run()
00054 {   
00055     client = socket.accept(&status);
00056     HTTP_PRINTF("After accept\n\r");
00057     if(status==NSAPI_ERROR_OK)
00058     {
00059         client->set_timeout(WEBSERVER_TIMEOUT_MS);
00060         n_recv = client->recv(buffer,MAX_BUFFER_SIZE);
00061         switch(n_recv) {
00062             case 0:
00063                 HTTP_PRINTF("received buffer is empty.");
00064                 status_code = 400;
00065                 sprintf(reason_phrase,"No Request");
00066                 httpmethod[0]    = '\0';
00067                 filepath[0]      = '\0';
00068                 http_ver[0]      = '\0';
00069                 break;  
00070             case -1:
00071                 HTTP_PRINTF("failed to read data from client.");
00072                 status_code = 500;
00073                 sprintf(reason_phrase,"Internal Server Error");
00074                 httpmethod[0]    = '\0';
00075                 filepath[0]      = '\0';
00076                 http_ver[0]      = '\0';
00077                 break;
00078             default:
00079                 HTTP_PRINTF("Received Data: %d",strlen(buffer));
00080                 HTTP_PRINTF("-->\r\n");
00081                 HTTP_PRINTF("%.*s[End of Request]",strlen(buffer),buffer);
00082                 //  get HTTP method, File path, HTTP version
00083                 strcpy(httpmethod,strtok(buffer, " ")); 
00084                 strcpy(filepath,strtok(NULL, " "));
00085                 strcpy(http_ver,strtok(NULL, " "));
00086                 HTTP_PRINTF("httpmethod: %s", httpmethod);
00087                 HTTP_PRINTF("file path:  %s", filepath);
00088                 HTTP_PRINTF("http ver :  %s", http_ver);
00089                 break;
00090         }
00091         
00092         if (httpmethod[0] == '\0') {
00093             buffer[MAX_BUFFER_SIZE - 1] = '\0';
00094             sprintf(buffer,"%s %d %s\r\nConnection: Close\r\n\r\n", http_ver, status_code, reason_phrase);
00095             HTTP_PRINTF("echo back done.");
00096         }
00097         
00098         //  Response
00099         if (strcmp(httpmethod,"GET") == 0 ) //GET request - always index.html stoed in index_html
00100         {
00101             HTTP_PRINTF("GET request incomming.");
00102             HTTP_PRINTF("httpmethod: %s", httpmethod);
00103             buffer[MAX_BUFFER_SIZE-1] = '\0';
00104             status_code = 200;
00105             sprintf(reason_phrase,"OK");
00106 
00107             sprintf(buffer,"%s %d %s\r\nConnection: Close\r\nContent-Type: text/html\r\nKeep-Alive: timeout=15\r\n\r\n", http_ver, status_code, reason_phrase);
00108             client->send(buffer,strlen(buffer));
00109             client->send(html_file,html_size);
00110         } 
00111         if (strcmp(httpmethod,"POST") == 0 ) //POST request - javascript request
00112         {
00113             HTTP_PRINTF("POST request incomming.");
00114             status_code = 200;
00115             sprintf(reason_phrase,"OK");
00116 
00117             sprintf(buffer,"%s %d %s\r\nConnection: Close\r\n\r\n", http_ver, status_code, reason_phrase);
00118             client->send(buffer,strlen(buffer));
00119             
00120             if(strcmp(filepath,"/read_data")==0){
00121                 sprintf(buffer,"0 1.25 2 200e-12 10e9 0 0 1.25 1 100e-12 10e9 0 0 1.25 0.5 50e-12 10e9 0 0 1.25 0.2 20e-12 10e9 0");
00122                 //sprintf(buffer,"%d %e %e %s %s\0",(*CH).range,(*CH).voltage,(*CH).current,full_scale[(*CH).range].c_str(),ranges[(*CH).range].c_str());
00123                 client->send(buffer,strlen(buffer));
00124                 HTTP_PRINTF("Response: %s",buffer);
00125                 /*
00126                 //Temporary: update current:
00127                 (*CH).current = (*CH).current+1e-12;
00128                 if((*CH).current > 10e-12)
00129                     (*CH).current = -10e-12; */
00130             }
00131             
00132             if(strncmp(filepath,"/range",strlen("/range"))==0)
00133             {
00134                 sscanf(filepath,"/range=%c",&c);
00135                 if(c>='0'&& c<='4')
00136                 {
00137                     //(*CH).range = c - '0';
00138                     //set_range((*CH).range);
00139                     //(*CH).new_data = 1;
00140                     HTTP_PRINTF("Changing range: %d",c - '0');
00141                 }
00142             }
00143             
00144             if(strcmp(filepath,"/device_name")==0)
00145             {
00146                 sprintf(buffer,"%s",DEVICE_NAME);
00147                 client->send(buffer,strlen(buffer));
00148             }
00149         }
00150         client->close();      
00151     } 
00152     else
00153         HTTP_PRINTF("Accept Error: %d\n\r",status);
00154 
00155     return 0;
00156 }