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.h

Revision:
17:080f2bed8b36
Parent:
15:0865fa4b046a
Child:
18:5de680c4cfcb
--- a/RdWebServer.h	Tue May 05 22:14:16 2015 +0000
+++ b/RdWebServer.h	Mon May 11 11:17:15 2015 +0000
@@ -53,6 +53,7 @@
 //#define SUPPORT_LOCAL_FILESYSTEM 1
 //#define SUPPORT_FOLDER_VIEW 1
 //#define SUPPORT_LOCAL_FILE_CACHE 1
+const int SUBST_MAX_FNAME_LEN = 40;  // note local files on MBED are 8.3 but this might include other files
 
 extern RawSerial pc;
 
@@ -61,12 +62,11 @@
 class RdFileCacheEntry
 {
     public:
-        static const int CACHE_MAX_FNAME_LEN = 15;  // note local files on MBED are 8.3
         RdFileCacheEntry(char* pFileName)
         {
             _bCacheValid = false;
-            strncpy(_fileName, pFileName, CACHE_MAX_FNAME_LEN-1);
-            _fileName[CACHE_MAX_FNAME_LEN-1] = '\0';
+            strncpy(_fileName, pFileName, SUBST_MAX_FNAME_LEN-1);
+            _fileName[SUBST_MAX_FNAME_LEN-1] = '\0';
             _pFileContent = NULL;
         }
         ~RdFileCacheEntry()
@@ -76,7 +76,7 @@
         bool readLocalFileIntoCache(char* fileName);
     public:
         bool _bCacheValid;
-        char _fileName[CACHE_MAX_FNAME_LEN];
+        char _fileName[SUBST_MAX_FNAME_LEN];
         char* _pFileContent;
         int _nFileLen;
 };
@@ -91,27 +91,23 @@
         static const int CMD_LOCALFILE = 1;
         static const int CMD_CALLBACK = 2;
         static const int CMD_SDORUSBFILE = 3;
-        RdWebServerCmdDef(char* pStr, int cmdType, CmdCallbackType callback, char* subst8dot3FileName = NULL, bool bCacheIfPossible = false)
+        RdWebServerCmdDef(char* pStr, int cmdType, CmdCallbackType callback, char* substFileName = NULL, bool bCacheIfPossible = false)
         {
             _pCmdStr = pStr;
             _cmdType = cmdType;
             _callback = callback;
-#ifdef SUPPORT_LOCAL_FILE_CACHE
-            _subst8dot3FileName[0] = '\0';
-            if (subst8dot3FileName != NULL)
+            _substFileName[0] = '\0';
+            if (substFileName != NULL)
             {
-                strncpy(_subst8dot3FileName, subst8dot3FileName, RdFileCacheEntry::CACHE_MAX_FNAME_LEN);
-                _subst8dot3FileName[RdFileCacheEntry::CACHE_MAX_FNAME_LEN-1] = '\0';
+                strncpy(_substFileName, substFileName, SUBST_MAX_FNAME_LEN);
+                _substFileName[SUBST_MAX_FNAME_LEN-1] = '\0';
             }
-#endif
             _bCacheIfPossible = bCacheIfPossible;
         };
         char* _pCmdStr;
         int _cmdType;
         CmdCallbackType _callback;
-#ifdef SUPPORT_LOCAL_FILE_CACHE
-        char _subst8dot3FileName[RdFileCacheEntry::CACHE_MAX_FNAME_LEN];
-#endif
+        char _substFileName[SUBST_MAX_FNAME_LEN];
         bool _bCacheIfPossible;
 };
 
@@ -145,13 +141,21 @@
         char _httpHeader[HTTPD_MAX_HDR_LENGTH+1];
         char _buffer[HTTPD_MAX_REQ_LENGTH+1];
 
-        void handleLocalFileRequest(char* cmdStr, char* argStr, TCPSocketConnection &client, char* httpHeader, bool bCacheIfPossible);
-        bool handleSDFileRequest(char* cmdStr, char* argStr, TCPSocketConnection &client, char* httpHeader);
+        bool handleLocalFileRequest(char* cmdStr, char* argStr, TCPSocketConnection &client, bool bCacheIfPossible);
+        bool handleSDFileRequest(char* cmdStr, char* argStr, TCPSocketConnection &client);
         void handleCGIRequest(char* pUriStr, char* pQueryStr);
 #ifdef SUPPORT_LOCAL_FILE_CACHE
-        void sendFromCache(RdFileCacheEntry* pCacheEntry, TCPSocketConnection &client, char* httpHeader);
+        void sendFromCache(RdFileCacheEntry* pCacheEntry, TCPSocketConnection &client);
 #endif
         bool handleReceivedHttp(TCPSocketConnection &client);
+        void formHTTPHeader(const char* rsltCode, const char* contentType, int contentLen);
+
+        // Settings - see the constructor
+        bool _blockingOnAccept;
+        bool _blockingOnReceive;
+        int _timeoutOnBlocking;
+        bool _closeConnAfterSend;
+        bool _closeConnOnReceiveFail;
 
 };