C Sonsino / HTTPServer

Single instance HTTP Server using new Ethernet Interface. Blocking mode only; this improved stability, but the HTTP server must be started from a separate thread.

Dependents:   SmartLight

Fork of HTTPServer by Henry Leinen

HTTPServer.cpp

Committer:
leihen
Date:
2013-06-22
Revision:
13:aa5338a5e452
Parent:
12:ba81cc117fb6
Child:
14:011edcd33e86

File content as of revision 13:aa5338a5e452:

#include "mbed.h"
#include "HTTPServer.h"
#define DEBUG
#include "debug.h"

#define _DEBUG      1

#ifdef _DEBUG
DigitalOut led1(LED1);
DigitalOut led2(LED2);
DigitalOut led3(LED3);
DigitalOut led4(LED4);
#endif

static EthernetInterface eth;

/* Constructor */
/* initialize all members and set the standard error handler. */
HTTPServer::HTTPServer()
{
    m_pErrorHandler = StdErrorHandler;
}

HTTPServer::~HTTPServer()
{
}


static const char* szStdErrorPage = "<HTML><HEAD><META content=\"text/html\" http-equiv=Content-Type></HEAD><BODY><h1>Error 404</h1><P>This resource is not available<P></BODY></HTML>\r\n\r\n";

void HTTPServer::StdErrorHandler(HTTPConnection::HTTPMessage& msg, TCPSocketConnection& tcp)
{
    char echoHeader[256];
    tcp.set_blocking(true, 1500);
    sprintf(echoHeader,"HTTP/1.0 404 Fail\r\nConnection: close\r\nContent-Length: %d\r\nContent-Type: text/html\r\nServer: mbed embedded\r\n\n\r",strlen(szStdErrorPage));
    tcp.send(echoHeader, strlen(echoHeader));
    tcp.send((char*)szStdErrorPage, strlen(szStdErrorPage));
}


bool HTTPServer::start(int port)
{
    INFO("Initializing network\n");
    eth.init();

    INFO("Connecting to network...");
    eth.connect();

    INFO("Binding to port %d...", port);
    if (m_Svr.bind(port) < 0) {
        ERR("Failed to bind to port !\n");
        error("Binding");
        return false;
    }

    INFO("Listening ...");
    if (m_Svr.listen(1) < 0) {
        ERR("Failed to listen !\n");
        error("Listening");
        return false;
    }

    ERR("Connected !");
    //  set into non blocking operation
    m_Svr.set_blocking(false, 100);

    return true;
}


int HTTPServer::poll(bool blocking)
{
    int retval = -1;

#ifdef _DEBUG
    led4 = 1;   //  Indicate we are waiting for a new connection
#endif
    //  This thread basically checks if there is a new incoming connection.
    //  If so , a new HTTPConnection is created and the connection thread is started.
    TCPSocketConnection Clnt;
    if (m_Svr.accept(Clnt) < 0) {
#ifdef _DEBUG
        led4 = 0;
        led3 = 1;   //  ERROR
        led2 = 0;
        led1 = 0;
#endif
        return -1;
    }

    //   a new connection was received
    INFO("Client (IP=%s) is connected !\n", Clnt.get_address());
#ifdef _DEBUG
    led4 = 0;
    led3 = 0;
    led2 = 0;
#endif

#ifdef _DEBUG
    led3 = 1;
    led2 = 1;
#endif
    HTTPConnection con(Clnt);
    int c = con.poll();
    if (c == 0) {
        //  Handle the request
        INFO("Handling request !");
        HandleRequest(con.m_Msg, Clnt);
    }
    if (c == -1) {
//        break;
    }
#ifdef _DEBUG
    led2 = 0;
    led3 = 0;
#endif


    INFO("Leaving polling thread");
    return 0;
}

void HTTPServer::HandleRequest(HTTPConnection::HTTPMessage& msg, TCPSocketConnection& tcp)
{
    std::string localPath;
    std::map<std::string, HTTPRequestHandler*(*)(const char*, const char*, HTTPConnection::HTTPMessage&, TCPSocketConnection&), handlersComp>::const_iterator it;

    //  Iterate through registered handlers and check if the handler's path is a subset of the requested uri.
    for (it = m_lpHandlers.begin() ; it != m_lpHandlers.end() ; it++) {
        //  check if this entries' path is fully contained at the beginning of the requested path
        std::string curpth = it->first;

        if (msg.uri.find(curpth) == 0) {
            // firts matching handler found, we just take it and we'll be happy
            localPath = msg.uri.substr(curpth.length());
            break;
        }
    }

    if (it == m_lpHandlers.end()) {
        //  There is no such handler, so return invalid

        m_pErrorHandler(msg, tcp);
        INFO("Webrequest left unhandled.");
    } else {
        //  Valid handler was found
        INFO("Routing webrequest !");
        //  Instantiate the handler object (handling will be done from withing the object's constructor
        HTTPRequestHandler *phdl = (*it->second)(it->first.c_str(), localPath.c_str(), msg, tcp);
        //  now we can delete the object, because handling is completed.
        if (phdl != NULL)
            delete phdl;
    }
}