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:
24:27800de38eab
Parent:
23:0fc3d7b5e596
Child:
26:3c4c10e989b1
--- a/RdWebServer.h	Mon Aug 31 08:54:17 2015 +0000
+++ b/RdWebServer.h	Mon Aug 31 15:00:41 2015 +0000
@@ -53,6 +53,9 @@
 #define RD_ERR(x, ...)
 #endif
 
+// Length of strings
+const int MAX_CMDSTR_LEN = 100;
+const int MAX_ARGSTR_LEN = 100;
 const int SUBST_MAX_FNAME_LEN = 40;  // note local files on MBED are 8.3 but this might include other files
 
 extern RawSerial pc;
@@ -79,7 +82,8 @@
         int _nFileLen;
 };
 
-typedef char* (*CmdCallbackType)(int method, char*cmdStr, char* argStr, char* msgBuffer);
+typedef char* (*CmdCallbackType)(int method, char*cmdStr, char* argStr, char* msgBuffer, int msgLen, 
+                int contentLen, unsigned char* pPayload, int payloadLen, int splitPayloadPos);
 
 class RdWebServerCmdDef
 {
@@ -131,8 +135,8 @@
         void run();
         void addCommand(char* pCmdStr, int cmdType, CmdCallbackType callback = NULL, char* substFileName = NULL, bool cacheIfPossible = false);
         
-        static unsigned char* getPayloadDataFromMsg(char* msgBuf);
-        static int getPayloadLengthFromMsg(char* msgBuf);
+        static unsigned char* getPayloadDataFromMsg(char* msgBuf, int msgLen, int& payloadLen);
+        static int getContentLengthFromMsg(char* msgBuf);
 
     private :
         int _port;
@@ -141,10 +145,11 @@
         bool _initOk;
         std::vector<RdWebServerCmdDef*> _commands;
         std::vector<RdFileCacheEntry*> _cachedFiles;
-        bool extractCmdArgs(char* buf, char* pCmdStr, int maxCmdStrLen, char* pArgStr, int maxArgStrLen);
+        bool extractCmdArgs(char* buf, char* pCmdStr, int maxCmdStrLen, char* pArgStr, int maxArgStrLen, int& contentLen);
         char* _pBaseWebFolder;
         char _httpHeader[HTTPD_MAX_HDR_LENGTH+1];
         char _buffer[HTTPD_MAX_REQ_LENGTH+1];
+        int _bufferReceivedLen;
 
         bool handleLocalFileRequest(char* cmdStr, char* argStr, TCPSocketConnection &client, bool bCacheIfPossible);
         bool handleSDFileRequest(char* cmdStr, char* argStr, TCPSocketConnection &client);
@@ -159,6 +164,14 @@
         int _timeoutOnBlocking;
         bool _closeConnAfterSend;
         bool _closeConnOnReceiveFail;
+        
+        // Handling of split payloads on receipt (e.g. POST)
+        int _curSplitPayloadPos;
+        char _curCmdStr[MAX_CMDSTR_LEN];
+        char _curArgStr[MAX_ARGSTR_LEN];
+        int _curContentLen;
+        int _curHttpMethod;
+        RdWebServerCmdDef* _curWebServerCmdDef;
 
 };