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.

Files at this revision

API Documentation at this revision

Revision 0:b5b4d07f7827, committed 2013-09-18

Comitter:
Bobty
Date:
Wed Sep 18 21:36:50 2013 +0000
Child:
1:75bb184de749
Commit message:
Initial

Changed in this revision

RdWebServer.cpp Show annotated file Show diff for this revision Revisions of this file
RdWebServer.h Show annotated file Show diff for this revision Revisions of this file 
--- /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;
+        }
+    }
+}
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/RdWebServer.h	Wed Sep 18 21:36:50 2013 +0000
@@ -0,0 +1,30 @@
+#ifndef RD_WEB_SERVER
+#define RD_WEB_SERVER
+
+#include <map>
+
+#include "mbed.h"
+#include "EthernetInterface.h"
+
+class RdWebServer
+{
+    public :
+    
+        RdWebServer();
+        virtual ~RdWebServer();
+        
+        bool init(int port, DigitalOut* pStatusLed);
+        void run();
+        bool isListening()
+        {
+            return _serverIsListening;
+        };
+        
+    private :
+        int _port;
+        DigitalOut* _pStatusLed;
+        TCPSocketServer _socketSrv;
+        bool _serverIsListening;
+};
+
+#endif