Rob Dobson / RdWebServer

A simple web server mainly based on ideas from Jasper Schuurmans Netduino web server

Dependents:   RdBlindsServer SpideyWallWeb RdGasUseMonitor

A fast and reliable web server for MBED! http://robdobson.com/2015/08/a-reliable-mbed-webserver/

It has a very neat way to implement REST commands and can serve files from local storage (on LPC1768 for instance) and from SD cards. It also has a caching facility which is particularly useful for serving files from local storage.

The server can be run in the main() thread (and has a sub-2ms response time if this is done) or in a mbed-rtos thread which increases the response time to (a still respectable) 30ms or so.

The latest project that uses this is here - https://developer.mbed.org/users/Bobty/code/SpideyWallWeb/

int main (void)
{
    // Ethernet interface
    EthernetInterface::init();

    // Connect ethernet
    EthernetInterface::connect();

    // Init the web server
    pc.printf("Starting web server\r\n");
    char* baseWebFolder = "/sd/";  // should be /sd/ for SDcard files - not used for local file system
    RdWebServer webServer;
    
    // Add commands to handle the home page and favicon
    webServer.addCommand("", RdWebServerCmdDef::CMD_LOCALFILE, NULL, "index.htm", true);
    webServer.addCommand("favicon.ico", RdWebServerCmdDef::CMD_LOCALFILE, NULL, NULL, true);
    
    // Add the lightwall control commands
    webServer.addCommand("name", RdWebServerCmdDef::CMD_CALLBACK, &lightwallGetSystemName);
    webServer.addCommand("clear", RdWebServerCmdDef::CMD_CALLBACK, &lightwallClear);
    webServer.addCommand("rawfill", RdWebServerCmdDef::CMD_CALLBACK, &lightwallRawFill);
    webServer.addCommand("fill", RdWebServerCmdDef::CMD_CALLBACK, &lightwallFill);
    webServer.addCommand("showleds", RdWebServerCmdDef::CMD_CALLBACK, &lightwallShowLeds);
    
    // Start the server
    webServer.init(WEBPORT, &led4, baseWebFolder);
    webServer.run();

}

// Get system name - No arguments required
char* lightwallGetSystemName(int method, char*cmdStr, char* argStr, char* msgBuffer, int msgLen, 
                int contentLen, unsigned char* pPayload, int payloadLen, int splitPayloadPos)
{
    // Perform any required actions here ....

    // ...

    // Return the system name
    return systemName;
}

This server was originally based on a Netduino web server from Jasper Schuurmans but has been optimised for speed.

Diff: RdWebServer.cpp

Revision:
4:6afb3bbf20a4
Parent:
3:594136d34a32
Child:
5:e6286b529d6b
--- a/RdWebServer.cpp	Fri Oct 04 10:36:57 2013 +0000
+++ b/RdWebServer.cpp	Mon Feb 02 16:36:14 2015 +0000
@@ -19,28 +19,41 @@
         printf("Failed to open file\n\r");
         return false;
     }
+    printf("Seeking\n\r");
     fseek(fp, 0, SEEK_END);
     _nFileLen = (int)ftell(fp);
     _pFileContent = new char[_nFileLen];
+    printf("Len %d Buf %08x\n\r", _nFileLen, _pFileContent);
     if (!_pFileContent)
     {
         printf("Failed to allocate %lu\n\r", _nFileLen);
         fclose(fp);
         return false;
     }
+    printf("Allocated\n\r");
+    memset(_pFileContent, 0, _nFileLen);
     fseek(fp, 0, SEEK_SET);
     char* pMem = _pFileContent;
-    char fileBuf[500];
+    char fileBuf[100];
     int totCnt = 0;
     int rdCnt;
-    while ((rdCnt = fread(fileBuf, sizeof( char ), 500, fp)) == 500) 
+    printf("Reading\n\r");
+    while (true)
     {
+        int toRead = _nFileLen - totCnt;
+        if (toRead > sizeof(fileBuf))
+            toRead = sizeof(fileBuf);
+        if (toRead <= 0)
+            break;
+        rdCnt = fread(fileBuf, sizeof(char), toRead, fp);
+        if (rdCnt <= 0)
+            break;
+        printf("Read %d tot %d of %d\n\r", rdCnt, totCnt, _nFileLen);
         memcpy(pMem, fileBuf, rdCnt);
         pMem += rdCnt;
         totCnt += rdCnt;
     }
-    memcpy(pMem, fileBuf, rdCnt);
-    totCnt += rdCnt;
+    printf("Done read\n\r");
     fclose(fp);
     printf("Success in caching %d bytes (read %d)\n\r", _nFileLen, totCnt);
     _bCacheValid = true;
@@ -60,10 +73,11 @@
         delete (*it);
 }
 
-bool RdWebServer::init(int port, DigitalOut* pStatusLed)
+bool RdWebServer::init(int port, DigitalOut* pStatusLed, char* pBaseWebFolder)
 {
     _port = port;
     _pStatusLed = pStatusLed;
+    _pBaseWebFolder = pBaseWebFolder;
         
 //    _socketSrv.set_blocking(true);
 
@@ -230,9 +244,9 @@
     char *lstchr = strrchr(inFileName, NULL) -1;
     if ('/' == *lstchr)
     {
-        // printf("Open directory /sd/%s\n", inFileName);
+        printf("Request file %s%s\n", _pBaseWebFolder, inFileName);
         *lstchr = 0;
-        sprintf(filename, "/sd/%s", inFileName);
+        sprintf(filename, "%s%s", _pBaseWebFolder, inFileName);
         DIR *d = opendir(filename);
         if (d != NULL) {
             sprintf(httpHeader,"HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nConnection: Close\r\n\r\n");
@@ -241,7 +255,7 @@
             pClient->send(httpHeader,strlen(httpHeader));
             struct dirent *p;
             while((p = readdir(d)) != NULL) {
-                // printf("%s\n", p->d_name);
+                printf("%s\n", p->d_name);
                 sprintf(httpHeader,"<li>%s</li>", p->d_name);
                 pClient->send(httpHeader,strlen(httpHeader));
             }
@@ -253,8 +267,8 @@
     }
     else
     {
-        sprintf(filename, "/sd/%s", inFileName);
-        // printf ("Filename %s\r\n", filename);
+        sprintf(filename, "%s%s", _pBaseWebFolder, inFileName);
+        printf ("Filename %s\r\n", filename);
         FILE* fp = fopen(filename, "r");
         if (fp == NULL)
         {
@@ -354,7 +368,7 @@
                                     else
                                         handleLocalFileRequest(cmdStr, argStr, &client, httpHeader, (*it)->_bCacheIfPossible);
                                 }
-                                else if ((*it)->_cmdType == RdWebServerCmdDef::CMD_SDCARDFILE)
+                                else if ((*it)->_cmdType == RdWebServerCmdDef::CMD_SDORUSBFILE)
                                 {
                                     if ((*it)->_substFileName[0] != '\0')
                                         handleSDFileRequest((*it)->_substFileName, argStr, &client, httpHeader);