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:
6:46285c519af2
Parent:
4:6afb3bbf20a4
Child:
7:fe7c33f7fbb8
--- a/RdWebServer.h	Tue Feb 03 12:08:12 2015 +0000
+++ b/RdWebServer.h	Fri Feb 06 14:17:47 2015 +0000
@@ -10,6 +10,8 @@
 #include "mbed.h"
 #include "EthernetInterface.h"
 
+extern RawSerial pc;
+
 class RdFileCacheEntry
 {
     public:
@@ -33,7 +35,7 @@
         int _nFileLen;
 };
 
-typedef void (*CmdCallbackType)(char*cmdStr, char* argStr);
+typedef char* (*CmdCallbackType)(char*cmdStr, char* argStr);
 
 class RdWebServerCmdDef
 {
@@ -61,6 +63,9 @@
         bool _bCacheIfPossible;
 };
 
+const int HTTPD_MAX_HDR_LENGTH = 255;
+const int HTTPD_MAX_REQ_LENGTH = 1023;
+
 class RdWebServer
 {
     public :
@@ -86,11 +91,14 @@
         std::vector<RdFileCacheEntry*> _cachedFiles;
         bool extractCmdArgs(char* buf, char* pCmdStr, int maxCmdStrLen, char* pArgStr, int maxArgStrLen);
         char* _pBaseWebFolder;
+        char _httpHeader[HTTPD_MAX_HDR_LENGTH+1];
+        char _buffer[HTTPD_MAX_REQ_LENGTH+1];
 
-        void handleLocalFileRequest(char* cmdStr, char* argStr, TCPSocketConnection* pClient, char* httpHeader, bool bCacheIfPossible);
-        void handleSDFileRequest(char* cmdStr, char* argStr, TCPSocketConnection* pClient, char* httpHeader);
+        void handleLocalFileRequest(char* cmdStr, char* argStr, TCPSocketConnection &client, char* httpHeader, bool bCacheIfPossible);
+        void handleSDFileRequest(char* cmdStr, char* argStr, TCPSocketConnection &client, char* httpHeader);
         void handleCGIRequest(char* pUriStr, char* pQueryStr);
-        void sendFromCache(RdFileCacheEntry* pCacheEntry, TCPSocketConnection* pClient, char* httpHeader);
+        void sendFromCache(RdFileCacheEntry* pCacheEntry, TCPSocketConnection &client, char* httpHeader);
+        void handleReceivedHttp(TCPSocketConnection &client);
 
 };