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:
12:c14ffd4ec125
Parent:
11:cec51b430b20
Child:
13:4f9c09d3da13
--- a/RdWebServer.cpp	Sun May 03 18:59:42 2015 +0000
+++ b/RdWebServer.cpp	Sun May 03 20:41:35 2015 +0000
@@ -4,6 +4,8 @@
    More details at http://robdobson.com/2013/10/moving-my-window-shades-control-to-mbed/
 */
 
+#define RDWEB_DEBUG 5
+
 #include "RdWebServer.h"
 
 #define MAX_CMDSTR_LEN 100
@@ -24,6 +26,8 @@
 
 bool RdWebServer::init(int port, DigitalOut* pStatusLed, char* pBaseWebFolder)
 {
+    printf("Here\r\n");
+    RD_INFO("Here\r\n");
     _port = port;
     _pStatusLed = pStatusLed;
     _pBaseWebFolder = pBaseWebFolder;
@@ -184,6 +188,7 @@
     
     RD_INFO("Requesting file %s\n\r", inFileName);
     
+#ifdef SUPPORT_FOLDER_VIEW
     if ((strlen(inFileName) > 0) && (inFileName[strlen(inFileName)-1] == '/'))
     {
         RD_INFO("Request directory %s%s\r\n", _pBaseWebFolder, inFileName);
@@ -209,6 +214,7 @@
         client.send(httpHeader,strlen(httpHeader));
     }
     else
+#endif
     {
         sprintf(filename, "%s%s", _pBaseWebFolder, inFileName);
         RD_INFO("Filename %s\r\n", filename);
@@ -258,6 +264,9 @@
 
 void RdWebServer::handleLocalFileRequest(char* inFileName, char* argStr, TCPSocketConnection &client, char* httpHeader, bool bCacheIfPossible)
 {
+
+#ifdef SUPPORT_LOCAL_FILESYSTEM
+
     const int HTTPD_MAX_FNAME_LENGTH = 127;
     char localFilename[HTTPD_MAX_FNAME_LENGTH+1];
     char reqFileNameStr[HTTPD_MAX_FNAME_LENGTH+1];
@@ -325,10 +334,21 @@
         client.send_all(fileBuf, rdCnt);
         fclose(fp);
     }
+    
+#else
+
+    RD_WARN("Local file system not supported\r\n");
+    sprintf(httpHeader,"HTTP/1.1 404 Not Found \r\nContent-Type: text\r\nConnection: Close\r\n\r\n");
+    client.send(httpHeader,strlen(httpHeader));
+    client.send_all(inFileName,strlen(inFileName));
+
+#endif
 }
 
 bool RdFileCacheEntry::readLocalFileIntoCache(char* fileName)
 {
+#ifdef SUPPORT_LOCAL_FILESYSTEM
+    
     RD_INFO("Reading into cache %s\n\r", fileName);
     LocalFileSystem local("local");
     FILE* fp = fopen(fileName, "r");
@@ -376,6 +396,9 @@
     RD_DBG("Success in caching %d bytes (read %d)\n\r", _nFileLen, totCnt);
     _bCacheValid = true;
     return true;
+#else
+    return false;
+#endif
 }
 
 bool RdWebServer::extractCmdArgs(char* buf, char* pCmdStr, int maxCmdStrLen, char* pArgStr, int maxArgStrLen)