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:
26:3c4c10e989b1
Parent:
25:ffa1dddd3da4
Child:
27:0c2d6f598ae5
--- a/RdWebServer.cpp	Mon Sep 28 10:29:45 2015 +0000
+++ b/RdWebServer.cpp	Tue Oct 13 18:33:57 2015 +0000
@@ -20,7 +20,7 @@
 const int MAX_FILENAME_LEN = (MAX_ARGSTR_LEN + 20);
 
 // Constructor
-RdWebServer::RdWebServer()
+RdWebServer::RdWebServer(Mutex* pSdCardMutex)
 {
     _initOk = false;
     _pStatusLed = NULL;
@@ -31,6 +31,7 @@
     _curContentLen = -1;
     _curHttpMethod = METHOD_OTHER;
     _curWebServerCmdDef = NULL;
+    _pSdCardMutex = pSdCardMutex;
 }
 
 // Destructor
@@ -307,6 +308,11 @@
     {
         RD_INFO("Request directory %s%s", _pBaseWebFolder, inFileName);
         sprintf(filename, "%s%s", _pBaseWebFolder, inFileName);
+        
+        // Obtain lock on SD card (if reqd)
+        if (_pSdCardMutex)
+            _pSdCardMutex->lock();
+            
         DIR *d = opendir(filename);
         if (d != NULL) 
         {
@@ -323,6 +329,11 @@
             }
         }
         closedir(d);
+        
+        // Release lock on SD card (if reqd)
+        if (_pSdCardMutex)
+            _pSdCardMutex->unlock();
+
         RD_DBG("Directory closed\n");
         sprintf(_httpHeader,"</ul></body></html>");
         clientSocketConn.send_all(_httpHeader,strlen(_httpHeader));
@@ -334,6 +345,10 @@
         sprintf(filename, "%s%s", _pBaseWebFolder, inFileName);
         RD_INFO("Filename %s", filename);
             
+        // Obtain lock on SD card (if reqd)
+        if (_pSdCardMutex)
+            _pSdCardMutex->lock();
+
         FILE* fp = fopen(filename, "r");
         if (fp == NULL)
         {
@@ -366,6 +381,11 @@
             fclose(fp);
             handledOk = true;
         }
+        
+        // Obtain lock on SD card (if reqd)
+        if (_pSdCardMutex)
+            _pSdCardMutex->unlock();
+
     }
     return handledOk;
 }