Diff: HttpServer.cpp

Revision:

14:7f9fbfc18623

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/HttpServer.cpp	Wed Jun 26 22:41:05 2013 +0000
@@ -0,0 +1,477 @@
+#include "mbed.h"
+#include "HttpServer.h"
+
+#define DEBUG
+#include "debug.h"
+
+
+#define EVENT_DATA_READY            0x05
+
+DigitalOut  ledRX(LED4);
+
+
+typedef struct {
+    char c;
+} message_t;
+
+Queue<char, 256>    m_queue;
+
+typedef struct {
+    const char* method;
+    msg_t   type;
+} methodType_t;
+
+const methodType_t supportedOps[] = {
+    { "GET", msg_get },
+    { "POST", msg_post },
+    { "PUT", msg_put },
+    { "HEAD", msg_head},
+    { "CONNECT", msg_connect},
+    { "DELETE", msg_delete},
+    { "TRACE", msg_trace},
+    { "OPTIONS", msg_options}
+};
+
+
+Queue<request_msg_t, 5>         m_requestQueue;     //  Do not allow more than 5 concurrent requests
+MemoryPool<request_msg_t, 5>    m_requestPool;
+
+map<string, string>     messageHeaders;
+
+map<string, HTTPRequestHandler* (*)(const char*, const char*, HTTPConnection::HTTPMessage&), HttpServer::handlersComp>   HttpServer::m_lpHandlers;
+
+
+
+/* Constructor will create and initialize all objects excep the threads */
+HttpServer::HttpServer(PinName tx, PinName rx, PinName rst, PinName tcp_status, const char * ssid, const char * phrase, Security sec, Wifly::WiflyBaudrate_t baud)
+    : Wifly(tx, rx, rst, tcp_status, ssid, phrase, sec, baud), m_listener(NULL), m_worker(NULL)
+{
+    INFO("Initializing wifly\n");
+    //  Initialize the wifly wlan device
+    reset();
+
+    state.dhcp = true;
+    INFO("Connecting to network...");
+    //  Try join the network
+    while(!join()) {
+        INFO("Failed to connect. Trying again\n");
+        reset();
+    }
+    INFO("connected\n");
+}
+
+HttpServer::~HttpServer()
+{
+    if (m_listener) {
+        m_listener->terminate();
+        delete m_listener;
+    }
+    if (m_worker) {
+        m_worker->terminate();
+        delete m_worker;
+    }
+}
+
+
+bool HttpServer::start(int port)
+{
+    //  Bind to that port
+    if (!bind(port)) {
+        ERR("Failed to bind to port %d\n", port);
+        return false;
+    }
+
+    //  Start the child threads
+    m_worker = new Thread(HttpServer::worker_thread, NULL, osPriorityAboveNormal, DEFAULT_STACK_SIZE*4);
+    if (m_worker == NULL) {
+        ERR("Failed to start server thread !\n");
+        return false;
+    }
+
+    m_listener = new Thread(&HttpServer::listen_thread, NULL, osPriorityAboveNormal, DEFAULT_STACK_SIZE*2);
+    if (m_listener == NULL) {
+        ERR("Failed to start listener thread !\n");
+        m_worker->terminate();
+        delete m_worker;
+        m_worker = NULL;
+        return false;
+    }
+
+    return true;
+}
+
+
+
+
+
+bool HttpServer::bind(int port)
+{
+    char cmd[20];
+
+    // set TCP protocol
+    setProtocol(TCP);
+
+    // set local port
+    sprintf(cmd, "set i l %d\r", port);
+    if (!sendCommand(cmd, "AOK"))
+        return false;
+
+    // save
+    if (!sendCommand("save\r", "Stor"))
+        return false;
+
+    // reboot
+    reboot();
+
+    // connect the network
+    if (isDHCP()) {
+        if (!sendCommand("join\r", "DHCP=ON", NULL, 10000))
+            return false;
+    } else {
+        if (!sendCommand("join\r", "Associated", NULL, 10000))
+            return false;
+    }
+
+    // exit
+    exit();
+
+    Thread::wait(200);
+    flush();
+
+    return true;
+}
+
+DigitalOut Led2(LED2);
+
+void HttpServer::handler_rx(void)
+{
+    static char sequence = 0;
+    //read characters
+    while (wifi.readable()) {
+        char c = LPC_UART3->RBR;
+        ledRX = !ledRX;
+        switch(sequence) {
+            case 0 : if (c == 'G') sequence = 1; break;
+            case 1 : if (c == 'E') sequence = 2; break;
+            case 2 : if (c == 'T') sequence = 0; Led2 = !Led2;break;
+            default: break;
+        }
+        m_queue.put((char*)(int)c);
+    }
+}
+
+
+void HttpServer::attach_rx(bool callback)
+{
+    if (!callback)
+        wifi.attach(NULL);
+    else
+        wifi.attach(this, &HttpServer::handler_rx);
+}
+
+
+bool HttpServer::join()
+{
+    return Wifly::join();
+}
+
+int HttpServer::send(const char * str, int len, const char * ACK, char * res, int timeout)
+{
+    return Wifly::send(str, len, ACK, res, timeout);
+}
+
+request_msg_t* HttpServer::checkMessageReceived(char *data)
+{
+    INFO("Checking for new HTTP request !\n");
+    char *req = data;
+    char *uri = NULL;
+    char *ver = NULL;
+    while( *data ) {
+        if (*data == ' ') {
+            *data = 0;
+            if (uri == NULL) {
+                uri = data+1;
+            } else {
+                ver = data+1;
+                break;
+            }
+        }
+        data++;
+    }
+
+    INFO("Detected : %s, %s, %s\n", req, uri, ver);
+
+    if ((req != NULL) && (uri != NULL) && (ver != NULL) ) {
+        for (int i = 0 ; i < sizeof(supportedOps) / sizeof(methodType_t) ; i++) {
+            if (strcmp(supportedOps[i].method, req) == 0) {
+                //  found the request
+                INFO("Request valid !!!\n");
+                request_msg_t* pmsg = m_requestPool.alloc();
+                pmsg->requestType = supportedOps[i].type;
+                strncpy(pmsg->requestUri, uri, 255);
+                return pmsg;
+            }
+        }
+    }
+
+    INFO("Invalid request \"%s\"\n", req);
+    return NULL;
+}
+
+void HttpServer::processMessageHeader(char* headerLine, char **fieldname, char **fieldvalue)
+{
+    *fieldname = headerLine;
+    *fieldvalue = NULL;
+
+    while( *headerLine ) {
+        if (*headerLine == ':') {
+            *headerLine++ = 0;
+            while(*headerLine == ' ') headerLine++;
+            *fieldvalue = headerLine;
+            return;
+        }
+        headerLine++;
+    }
+    return ;
+}
+
+
+void HttpServer::listenForRequests()
+{
+    static char data[256];
+    static int curPos = 0;
+    int CRLF = 0;
+    int         m_openConnections = 0;
+
+    request_msg_t    *pMsg = NULL;
+    INFO("Listener running\n");
+    bool asteriskReceivedOnce = false;
+    while(1) {
+        osEvent evt = m_queue.get();
+        if (evt.status == osEventMessage) {
+            char c;
+            c = (char)(int)evt.value.p;
+            if ((c!='\n') && (c!='\r')) {
+                data[curPos++] = c;
+                data[curPos] = 0;
+            }
+            if (pMsg != NULL) {        //  request was detected and will further be processed completely
+                //  check for CRLF
+                if (c == '\n') {
+                    CRLF++;
+                    INFO("<CR>(%d)", CRLF);
+                    if (CRLF == 2) {    //  all message headers received, so send message and be ready for new one
+                        CRLF = 0;
+                        //  SPAWN MESSAGE
+                        INFO("REQUEST COMPLETE --> Handing over to worker thread !\n\n\n\n");
+                        m_requestQueue.put(pMsg);
+                        data[0] = 0;
+                        curPos = 0;
+                        asteriskReceivedOnce = false;
+                        pMsg = NULL;
+                    } else {            //  must be a new header
+//                        char *name, *value;
+//                        INFO("Processing Header !\"%s\"", data);
+/*                        processMessageHeader(data, &name, &value);
+                        if (strncmp(name, "Content-Length", 14 ) == 0) {
+                            //  Data will be sent, be ready to receive
+                        } else {
+                            INFO("HEADER: Name=\"%s\", Value=\"%s\"", name, value);
+                        }
+*/                        data[0] = 0;
+                        curPos = 0;
+                    }
+                } else {
+                    if (c != '\r')
+                        CRLF = 0;
+                        else
+                        INFO("<LF>");
+                }
+            } else if (c == '*') {
+                CRLF = 0;
+                if (asteriskReceivedOnce) {
+                    //  could be an open, close or read command
+                    if (curPos >= 6) {    // only need to process if data is large enough
+                        if ( (data[curPos-6] == '*') && (data[curPos-5] == 'O') && (data[curPos-4] == 'P') && (data[curPos-3] == 'E') && (data[curPos-2] == 'N') && (data[curPos-1] == '*')) {
+                            //  Add a connection
+                            INFO("New connection opened (%d)...\n", ++m_openConnections);
+                            data[0] = 0;
+                            curPos = 0;
+                        } else if ( (data[curPos-6] == '*') && (data[curPos-5] == 'C') && (data[curPos-4] == 'L') && (data[curPos-3] == 'O') && (data[curPos-2] == 'S') && (data[curPos-1] == '*')) {
+                            //  close a connection
+                            INFO("Connection was closed ...(%d)\n", --m_openConnections);
+                            data[0] = 0;
+                            curPos = 0;
+                        }
+                    }
+                    asteriskReceivedOnce = false;
+                } else {        //  set the indicator so that next time we'll check for valid connection commands
+                    asteriskReceivedOnce = true;
+                }
+            } else {      //  first make sure that when no asterisk is received the asteriskReceivedOnce flag will be reset on each newline
+                if (c == '\n') {
+                    if (m_openConnections > 0) {
+                        //  Check to see if we received a valid request
+                        pMsg = checkMessageReceived(data);
+                        if (pMsg == NULL) {
+                            //  not received valid stuff, so discard
+                            INFO("Unrecognised data received : \"%s\"\n", data);
+                        } else {
+                            INFO("New request detected ! : \"%s\"\n", data);
+                        }
+                    } else {
+                        INFO("Unrecognised data detected : \"%s\"\n", data);
+                    }
+                    asteriskReceivedOnce = false;
+                    data[0] = 0;
+                    curPos = 0;
+                    CRLF = 1;
+                }
+            }
+        }
+//        else {
+            Thread::yield();
+//        }
+    }
+}
+
+void HttpServer::serveRequests()
+{
+    HTTPConnection::HTTPMessage     *myMessage = new HTTPConnection::HTTPMessage;
+    
+    INFO("Server running\n");
+
+    while(1) {
+        INFO("Listening for new request !");
+        osEvent evt = m_requestQueue.get();
+        if (evt.status == osEventMessage) {
+            request_msg_t* pMsg = (request_msg_t*)evt.value.p;
+            m_worker->set_priority(osPriorityBelowNormal);
+            Thread::yield();
+            switch(pMsg->requestType) {
+                case    msg_get:
+                    INFO("Server received GET message !");
+                    myMessage->request = HTTP_RT_GET;
+                    myMessage->uri = pMsg->requestUri;
+                    HandleRequest(myMessage);
+                    Thread::yield();
+                    break;
+
+                case    msg_post:
+                case    msg_put:
+                case    msg_head:
+                case    msg_delete:
+                case    msg_trace:
+                case    msg_options:
+                case    msg_connect:
+                default:
+                    break;
+            }
+            m_worker->set_priority(osPriorityNormal);
+            m_requestPool.free(pMsg);
+        }
+        Thread::yield();
+    }
+}
+
+bool HttpServer::parseRequest(char *request)
+{
+    //  dissect into :   path, file[, [arg, value]1..N ]   as  "/path/file?arg1=val1&arg2=val2...
+    //  first check for questionmark sign to separate the file and path from any arguments
+    char* path = request;
+    char* file = NULL;
+    char* arglist = NULL;
+
+    char* lastPathSep = NULL;
+    while(*request) {
+        if (*request == '/' )
+            lastPathSep = request;
+        if (*request == '?') {
+            *request++ = 0;
+            arglist = request;
+        }
+    }
+
+    if (arglist == NULL) {
+        INFO("Request does not have parameters !");
+    }
+
+    if (lastPathSep == NULL)
+        return false;               //  no path provided !!!!
+
+    //  now, whatever is provided to the left including the slash is the 'path', the part to the right is the file. caution: the file may be left blank !
+    if (lastPathSep != 0) {
+        //  2 cases to handle :
+        //  1. :      "/blah/" or "/blah/blub/"                 --> path = "/blah/", file = "index.html"
+        //  2. :      "/blah/blub" or "/blah/blub/blubber"      --> path = "/blah/", file = "blub"
+    } else {
+        //  2 cases to handle :
+        //  1. :      "/"       --> path = "/", file = "index.html"
+        //  2. :      "/blah"   --> path = "/", file = "blah"
+    }
+    return true;
+}
+
+
+void HttpServer::listen_thread(const void *params)
+{
+    HttpServer* pSvr = (HttpServer*)params;
+
+    pSvr->listenForRequests();
+}
+
+void HttpServer::worker_thread(const void * params)
+{
+    HttpServer* pSvr = (HttpServer*)params;
+
+    pSvr->serveRequests();
+}
+
+
+
+
+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)
+{
+    char echoHeader[256];
+    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));
+    
+    Wifly::getInstance()->sendData(echoHeader, strlen(echoHeader));
+    Wifly::getInstance()->sendData((char*)szStdErrorPage, strlen(szStdErrorPage));
+}
+
+void HttpServer::HandleRequest(HTTPConnection::HTTPMessage* pmsg)
+{
+    static std::string localPath;
+    static std::map<std::string, HTTPRequestHandler*(*)(const char*, const char*, HTTPConnection::HTTPMessage&), handlersComp>::const_iterator it;
+
+    INFO("Trying to handle request");
+    //  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 (pmsg->uri.find(curpth) == 0) {
+            // firts matching handler found, we just take it and we'll be happy
+            localPath = pmsg->uri.substr(curpth.length());
+            break;
+        }
+    }
+
+    if (it == m_lpHandlers.end()) {
+        //  There is no such handler, so return invalid
+        INFO("Webrequest left unhandled.");
+
+        m_pErrorHandler(*pmsg);
+    } 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(), *pmsg);
+        //  now we can delete the object, because handling is completed.
+        if (phdl != NULL)
+            delete phdl;
+    }
+}
+