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@4:d065642c32cc, 2013-05-28 (annotated)

Committer:
leihen
Date:
Tue May 28 21:20:58 2013 +0000
Revision:
4:d065642c32cc
Parent:
3:d6224049b3bf
Child:
5:dc88012caef1
Added parameter parsing from uri in http webrequest.

; Documentation updated.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
leihen 0:7a2421e63e74 1 #include "mbed.h"
leihen 0:7a2421e63e74 2 #include "HTTPServer.h"
leihen 0:7a2421e63e74 3
leihen 4:d065642c32cc 4 #define _DEBUG 1
leihen 4:d065642c32cc 5
leihen 4:d065642c32cc 6 #ifdef _DEBUG
leihen 0:7a2421e63e74 7 DigitalOut led1(LED1);
leihen 0:7a2421e63e74 8 DigitalOut led2(LED2);
leihen 0:7a2421e63e74 9 DigitalOut led3(LED3);
leihen 0:7a2421e63e74 10 DigitalOut led4(LED4);
leihen 4:d065642c32cc 11 #endif
leihen 0:7a2421e63e74 12
leihen 4:d065642c32cc 13 #if (_DEBUG && !defined(TARGET_LPC11U24))
leihen 0:7a2421e63e74 14 #define INFO(x, ...) if (m_pDbg) m_pDbg->printf("[HttpServer : DBG]"x"\r\n", ##__VA_ARGS__); else printf("[HttpServer : DBG]"x"\r\n", ##__VA_ARGS__);
leihen 0:7a2421e63e74 15 #define WARN(x, ...) if (m_pDbg) m_pDbg->printf("[HttpServer : WARN]"x"\r\n", ##__VA_ARGS__); else printf("[HttpServer : DBG]"x"\r\n", ##__VA_ARGS__);
leihen 0:7a2421e63e74 16 #define ERR(x, ...) if (m_pDbg) m_pDbg->printf("[HttpServer : ERR]"x"\r\n", ##__VA_ARGS__); else printf("[HttpServer : DBG]"x"\r\n", ##__VA_ARGS__);
leihen 0:7a2421e63e74 17 #else
leihen 0:7a2421e63e74 18 #define INFO(x, ...)
leihen 0:7a2421e63e74 19 #define WARN(x, ...)
leihen 0:7a2421e63e74 20 #define ERR(x, ...)
leihen 0:7a2421e63e74 21 #endif
leihen 0:7a2421e63e74 22
leihen 4:d065642c32cc 23
leihen 4:d065642c32cc 24 /* Constructor */
leihen 4:d065642c32cc 25 /* initialize all members and set the standard error handler. */
leihen 3:d6224049b3bf 26 HTTPServer::HTTPServer(Serial *dbg)
leihen 0:7a2421e63e74 27 {
leihen 3:d6224049b3bf 28 m_pDbg = dbg;
leihen 0:7a2421e63e74 29 m_pSvr = NULL;
leihen 2:8653bbcf7e58 30 m_pErrorHandler = StdErrorHandler;
leihen 0:7a2421e63e74 31 }
leihen 0:7a2421e63e74 32
leihen 0:7a2421e63e74 33 HTTPServer::~HTTPServer()
leihen 0:7a2421e63e74 34 {
leihen 0:7a2421e63e74 35 if (m_pSvr) {
leihen 0:7a2421e63e74 36 delete m_pSvr;
leihen 0:7a2421e63e74 37 m_pSvr = NULL;
leihen 0:7a2421e63e74 38 }
leihen 0:7a2421e63e74 39 }
leihen 0:7a2421e63e74 40
leihen 2:8653bbcf7e58 41
leihen 4:d065642c32cc 42 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";
leihen 2:8653bbcf7e58 43
leihen 3:d6224049b3bf 44 void HTTPServer::StdErrorHandler(HTTPConnection::HTTPMessage& msg, TCPSocketConnection& tcp)
leihen 2:8653bbcf7e58 45 {
leihen 4:d065642c32cc 46 char echoHeader[256];
leihen 2:8653bbcf7e58 47 tcp.set_blocking(true, 1500);
leihen 2:8653bbcf7e58 48 sprintf(echoHeader,"HTTP/1.1 404 Fail\r\nContent-Length: %d\r\nContent-Type: text/html\r\nServer: mbed embedded\r\n\n\r",strlen(szStdErrorPage));
leihen 2:8653bbcf7e58 49 tcp.send(echoHeader, strlen(echoHeader));
leihen 2:8653bbcf7e58 50 tcp.send((char*)szStdErrorPage, strlen(szStdErrorPage));
leihen 2:8653bbcf7e58 51 }
leihen 2:8653bbcf7e58 52
leihen 2:8653bbcf7e58 53
leihen 0:7a2421e63e74 54 int HTTPServer::start(int port)
leihen 0:7a2421e63e74 55 {
leihen 0:7a2421e63e74 56 // check if the start member was called already once
leihen 0:7a2421e63e74 57 if (m_pSvr != NULL) {
leihen 0:7a2421e63e74 58 ERR("start function was already called, server is already in listening state.");
leihen 0:7a2421e63e74 59 return -1;
leihen 0:7a2421e63e74 60 }
leihen 0:7a2421e63e74 61
leihen 0:7a2421e63e74 62 // Create a new server object
leihen 0:7a2421e63e74 63 m_pSvr = new TCPSocketServer();
leihen 0:7a2421e63e74 64
leihen 0:7a2421e63e74 65 // Bind the local server to the given port
leihen 0:7a2421e63e74 66 if (m_pSvr->bind(port) < 0) {
leihen 0:7a2421e63e74 67 ERR("Failed to bind to port %d\n", port);
leihen 0:7a2421e63e74 68 return -1;
leihen 0:7a2421e63e74 69 }
leihen 0:7a2421e63e74 70 else {
leihen 0:7a2421e63e74 71 INFO("Binding succeeded !\n");
leihen 0:7a2421e63e74 72 }
leihen 0:7a2421e63e74 73
leihen 0:7a2421e63e74 74 // Listen to a maximum of 10 concurrent connections
leihen 0:7a2421e63e74 75 if (m_pSvr->listen(1) < 0) {
leihen 0:7a2421e63e74 76 ERR("Faild to listen !\n");
leihen 0:7a2421e63e74 77 delete m_pSvr;
leihen 0:7a2421e63e74 78 m_pSvr = NULL;
leihen 0:7a2421e63e74 79 return -1;
leihen 0:7a2421e63e74 80 }
leihen 0:7a2421e63e74 81 else {
leihen 0:7a2421e63e74 82 INFO("Listening\n");
leihen 0:7a2421e63e74 83 }
leihen 0:7a2421e63e74 84
leihen 0:7a2421e63e74 85 // set into non blocking operation
leihen 0:7a2421e63e74 86 m_pSvr->set_blocking(false, 100);
leihen 0:7a2421e63e74 87
leihen 0:7a2421e63e74 88 return 0;
leihen 0:7a2421e63e74 89 }
leihen 0:7a2421e63e74 90
leihen 0:7a2421e63e74 91
leihen 0:7a2421e63e74 92 int HTTPServer::poll()
leihen 0:7a2421e63e74 93 {
leihen 0:7a2421e63e74 94 INFO("Listening for new connection requests.");
leihen 0:7a2421e63e74 95
leihen 0:7a2421e63e74 96 // This thread basically checks if there is a new incoming connection.
leihen 0:7a2421e63e74 97 // If so , a new HTTPConnection is created and the connection thread is started.
leihen 0:7a2421e63e74 98 TCPSocketConnection Clnt;
leihen 0:7a2421e63e74 99
leihen 4:d065642c32cc 100 #ifdef _DEBUG
leihen 0:7a2421e63e74 101 led4 = 1; // Indicate we are waiting for a new connection
leihen 4:d065642c32cc 102 #endif
leihen 0:7a2421e63e74 103 if (m_pSvr->accept(Clnt) < 0) {
leihen 0:7a2421e63e74 104 // an error occured
leihen 0:7a2421e63e74 105 ERR("There was an error, Accept returned with an error. Probably the connection to the router was lost. Shutting down server");
leihen 4:d065642c32cc 106 #ifdef _DEBUG
leihen 0:7a2421e63e74 107 led2 = 0;
leihen 4:d065642c32cc 108 #endif
leihen 0:7a2421e63e74 109 m_pSvr->close();
leihen 0:7a2421e63e74 110 delete m_pSvr;
leihen 0:7a2421e63e74 111 m_pSvr = NULL;
leihen 4:d065642c32cc 112 #ifdef _DEBUG
leihen 0:7a2421e63e74 113 led4 = 0;
leihen 0:7a2421e63e74 114 led3 = 1; // ERROR
leihen 0:7a2421e63e74 115 led2 = 0;
leihen 0:7a2421e63e74 116 led1 = 0;
leihen 4:d065642c32cc 117 #endif
leihen 0:7a2421e63e74 118 return -1;
leihen 0:7a2421e63e74 119 }
leihen 0:7a2421e63e74 120 else {
leihen 4:d065642c32cc 121 #ifdef _DEBUG
leihen 0:7a2421e63e74 122 led4 = 0;
leihen 4:d065642c32cc 123 #endif
leihen 0:7a2421e63e74 124 // a new connection was received
leihen 0:7a2421e63e74 125 INFO("Client (IP=%s) is connected !\n", Clnt.get_address());
leihen 0:7a2421e63e74 126 // Start the main connection thread
leihen 4:d065642c32cc 127 #ifdef _DEBUG
leihen 0:7a2421e63e74 128 led3 = 1;
leihen 0:7a2421e63e74 129 led2 = 1;
leihen 4:d065642c32cc 130 #endif
leihen 0:7a2421e63e74 131 HTTPConnection con;
leihen 0:7a2421e63e74 132 int c = con.poll();
leihen 0:7a2421e63e74 133 if (c == 0) {
leihen 1:6b7472d5e9ee 134 // Handle the request
leihen 1:6b7472d5e9ee 135 HandleRequest(con.m_Msg, Clnt);
leihen 0:7a2421e63e74 136 }
leihen 4:d065642c32cc 137 #ifdef _DEBUG
leihen 0:7a2421e63e74 138 led2 = 0;
leihen 0:7a2421e63e74 139 led3 = 0;
leihen 4:d065642c32cc 140 #endif
leihen 0:7a2421e63e74 141 }
leihen 0:7a2421e63e74 142
leihen 0:7a2421e63e74 143 INFO("Leaving polling thread");
leihen 0:7a2421e63e74 144 return 0;
leihen 1:6b7472d5e9ee 145 }
leihen 1:6b7472d5e9ee 146
leihen 3:d6224049b3bf 147 void HTTPServer::HandleRequest(HTTPConnection::HTTPMessage& msg, TCPSocketConnection& tcp)
leihen 3:d6224049b3bf 148 {
leihen 3:d6224049b3bf 149 std::string localPath;
leihen 3:d6224049b3bf 150 std::map<std::string, HTTPRequestHandler*(*)(const char*, const char*, HTTPConnection::HTTPMessage&, TCPSocketConnection&), handlersComp>::const_iterator it;
leihen 3:d6224049b3bf 151
leihen 4:d065642c32cc 152 // Iterate through registered handlers and check if the handler's path is a subset of the requested uri.
leihen 3:d6224049b3bf 153 for (it = m_lpHandlers.begin() ; it != m_lpHandlers.end() ; it++) {
leihen 3:d6224049b3bf 154 // check if this entries' path is fully contained at the beginning of the requested path
leihen 3:d6224049b3bf 155 std::string curpth = it->first;
leihen 3:d6224049b3bf 156
leihen 3:d6224049b3bf 157 if (msg.uri.find(curpth) == 0) {
leihen 4:d065642c32cc 158 // firts matching handler found, we just take it and we'll be happy
leihen 3:d6224049b3bf 159 localPath = msg.uri.substr(curpth.length());
leihen 3:d6224049b3bf 160 break;
leihen 3:d6224049b3bf 161 }
leihen 3:d6224049b3bf 162 }
leihen 3:d6224049b3bf 163
leihen 3:d6224049b3bf 164 if (it == m_lpHandlers.end()) {
leihen 3:d6224049b3bf 165 // There is no such handler, so return invalid
leihen 3:d6224049b3bf 166
leihen 3:d6224049b3bf 167 m_pErrorHandler(msg, tcp);
leihen 3:d6224049b3bf 168 INFO("Webrequest left unhandled.");
leihen 3:d6224049b3bf 169 }
leihen 3:d6224049b3bf 170 else {
leihen 4:d065642c32cc 171 // Valid handler was found
leihen 3:d6224049b3bf 172 INFO("Routing webrequest !");
leihen 4:d065642c32cc 173 // Instantiate the handler object (handling will be done from withing the object's constructor
leihen 3:d6224049b3bf 174 HTTPRequestHandler *phdl = (*it->second)(it->first.c_str(), localPath.c_str(), msg, tcp);
leihen 4:d065642c32cc 175 // now we can delete the object, because handling is completed.
leihen 3:d6224049b3bf 176 if (phdl != NULL)
leihen 3:d6224049b3bf 177 delete phdl;
leihen 3:d6224049b3bf 178 }
leihen 3:d6224049b3bf 179 }