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:
0:b5b4d07f7827
Child:
1:75bb184de749
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/RdWebServer.cpp	Wed Sep 18 21:36:50 2013 +0000
@@ -0,0 +1,105 @@
+#include "RdWebServer.h"
+
+RdWebServer::RdWebServer()
+{
+    _serverIsListening = false;
+    _pStatusLed = NULL;
+}
+
+RdWebServer::~RdWebServer()
+{
+}
+
+bool RdWebServer::init(int port, DigitalOut* pStatusLed)
+{
+    _port = port;
+    _pStatusLed = pStatusLed;
+        
+//    _socketSrv.set_blocking(true);
+
+
+    //setup tcp socket
+    if(_socketSrv.bind(port)< 0) 
+    {
+        printf("tcp server bind failed.\n\r");
+        return false;
+    }
+    else 
+    {
+        printf("tcp server bind successed.\n\r");
+        _serverIsListening = true;
+    }
+
+    if(_socketSrv.listen(1) < 0)
+    {
+        printf("tcp server listen failed.\n\r");
+        return false;
+    }
+    else 
+    {
+        printf("tcp server is listening...\n\r");
+    }
+    
+    return true;
+}
+
+  
+void RdWebServer::run()
+{
+    TCPSocketConnection client;
+    bool clientIsConnected = false;
+
+    //listening for http GET request
+    while (isListening()) 
+    {
+        //blocking mode(never timeout)
+        if(_socketSrv.accept(client)<0) 
+        {
+            printf("failed to accept connection.\n\r");
+        }
+        else
+        {
+            printf("connection success!\n\rIP: %s\n\r",client.get_address());
+            clientIsConnected = true;
+            if (_pStatusLed != NULL)
+                *_pStatusLed = true;
+            
+            while(clientIsConnected) 
+            {
+                char buffer[1024] = {};
+                switch(client.receive(buffer, 1023)) 
+                {
+                    case 0:
+                        printf("recieved buffer is empty.\n\r");
+                        clientIsConnected = false;
+                        break;
+                    case -1:
+                        printf("failed to read data from client.\n\r");
+                        clientIsConnected = false;
+                        break;
+                    default:
+                        printf("Recieved Data: %d\n\r\n\r%.*s\n\r",strlen(buffer),strlen(buffer),buffer);
+                        if(buffer[0] == 'G' && buffer[1] == 'E' && buffer[2] == 'T' ) 
+                        {
+                            printf("GET request incomming.\n\r");
+                            
+                            
+                            //setup http response header & data
+                            char echoHeader[256] = {};
+                            sprintf(echoHeader,"HTTP/1.1 200 OK\n\rContent-Length: %d\n\rContent-Type: text\n\rConnection: Close\n\r\n\r",strlen(buffer));
+                            client.send(echoHeader,strlen(echoHeader));
+                            client.send(buffer,strlen(buffer));
+                            clientIsConnected = false;
+                            printf("echo back done.\n\r");
+                        }
+                        break;
+                }
+            }
+            printf("close connection.\n\rtcp server is listening...\n\r");
+            client.close();
+            if (_pStatusLed != NULL)
+                *_pStatusLed = false;
+        }
+    }
+}
+