Single instance HTTP Server using WiFly Interface.
Dependents: WiFlyHTTPServerSample MultiThreadingHTTPServer
This is my implementation for a HTTP Server using the WiFly Interface. Please note that this is still under development.
It may still contain several bugs. I have tested it using a 1768 on an application board plus RN-XV board.
Currently there is only a FileSystem implemented. Also it is limited to GET request.
I try to extend it further so it will be more useful.
Btw, it does NOT work with RTOS, which seems not to be the Problem of my library.
Do not Forget to Import the WiFly Interface into your Project when using this library.
Change History:
REV5: - added support for basic RPC GET request functionality.
REV4: - added argument parsing from the request uri. - documentation extended and updated.
HTTPConnection.cpp
- Committer:
- leihen
- Date:
- 2013-06-02
- Revision:
- 9:c2a1462b9b71
- Parent:
- 6:fe661fa9d18a
- Child:
- 11:3943841e1798
File content as of revision 9:c2a1462b9b71:
/* HTTPConnection.cpp */ #include "mbed.h" #include "HTTPConnection.h" #define _DEBUG 0 #include <vector> using std::vector; using std::string; #if (_DEBUG && !defined(TARGET_LPC11U24)) #define INFO(x, ...) std::printf("[HttpConnection : INFO]"x"\r\n", ##__VA_ARGS__); #define WARN(x, ...) std::printf("[HttpConnection : WARN]"x"\r\n", ##__VA_ARGS__); #define ERR(x, ...) std::printf("[HttpConnection : ERR]"x"\r\n", ##__VA_ARGS__); #else #define INFO(x, ...) #define WARN(x, ...) #define ERR(x, ...) #endif const struct HTTPRequestConfig { const char* request_string; HTTPRequestType request_type; } g_requestConfig[] = { { "GET", HTTP_RT_GET }, { "POST", HTTP_RT_POST}, { "PUT", HTTP_RT_PUT}, { "OPTIONS",HTTP_RT_OPTIONS}, { "HEAD", HTTP_RT_HEAD}, { "DELETE", HTTP_RT_DELETE}, { "TRACE", HTTP_RT_TRACE}, { "CONNECT",HTTP_RT_CONNECT} }; HTTPConnection::HTTPConnection() { } HTTPConnection::~HTTPConnection() { close(); } void HTTPConnection::close() { m_Msg.headers.clear(); } int HTTPConnection::poll() { static char buffer[256] = {}; int rcvd= 0; INFO("Waiting for new data in connection"); // Try receiving request line rcvd = receiveLine(buffer, 255, 3000); if (rcvd == -1) { // there was an error, probably the connection was closed, so close this connection as well INFO("No more data available. Will close this connection now."); close(); return -1; } // The Request has not yet been received so try it rcvd = parse(buffer); if (rcvd == -1) { // Invalid content received, so close the connection INFO("Invalid message received, so sending negative response and closing connection !"); sprintf(buffer,"HTTP/1.0 400 BadRequest\n\rContent-Length: %d\n\rContent-Type: text\n\rConnection: Close\n\r\n\r",0); m_Tcp.set_blocking(true, 1500); m_Tcp.send(buffer,strlen(buffer)); close(); rcvd = -1; return -1; } // The request has been received, try receive the body while(rcvd > 0) { rcvd = receiveLine((char*)buffer, 255, 3000); // First check if we received an empty line. This would indicate the end of the message or message body. if (rcvd < 0) { // there was an empty line, so we can start with performing the request INFO("Request Header was received completely. Performing request."); rcvd = 0; break; } else { // add message body if (parseHeader(buffer) == 0) { } else { WARN("Invalid message header received !"); } } } INFO("Leaving poll function!"); return rcvd; } int HTTPConnection::receiveLine(char* szLine, int nMaxLen, int nTimeout, char cLineTerm) { if ((szLine == NULL) || (nMaxLen == 0)) return -1; m_Tcp.set_blocking(false); Timer tm; int i; // Try to receive up to the max number of characters for (i = 0 ; i < nMaxLen-1 ; i++) { int c; c = m_Tcp.receive_all( szLine + i, 1 ); // Check that - if no character was currently received - the timeout period is reached. if ((c == 0) || (c==-1)) { // no character was read, so check if operation timed out if (tm.read_ms() > nTimeout) { // Operation timed out INFO("Timeout occured in function 'receiveLine'."); return -1; } } // Check if line terminating character was received if (szLine[i] == cLineTerm) break; } // Terminate with \0 szLine[i] = 0; // Trim for '\r' linefeed at the end if( (i >0) && (szLine[i-1] == '\r')) { i--; szLine[i] = 0; } INFO("receiveLine : \"%s\".", szLine); // return number of characters received in the line or return -2 if an empty line was received if ((i == 0) || ((i==1) &&(szLine[0] == '\r'))) { // empty line received, so return -2 return -2; } return i; } int HTTPConnection::parse(char* buffer) { // Check if buffer is invalid or its content not long enough. if ((buffer == NULL) || (strlen(buffer) < 4)) { ERR("Buffer content is invalid or too short."); return -1; } std::vector<std::string> args; args.clear(); int argno = 0; // decompose string into a list of arguments char s = 0; // current starting char int nLen = strlen(buffer)+1; for (int i = 0 ; i < nLen ; i++) { if ((buffer[i] == ' ') || (buffer[i] == '\n') || (buffer[i] == 0)) { // new arg found buffer[i] = 0; if (argno++ == 1) { // its the uri // parse the uri args parseUriArgs(&buffer[s], m_Msg.args); } INFO("Found argument \"%s\"", &buffer[s]); args.push_back(&buffer[s]); s = i+1; } } // store the uri and the HTTP version m_Msg.uri = args[1]; m_Msg.version = args[2]; // Find matching request type for (int i = 0 ; i < sizeof(g_requestConfig)/sizeof(struct HTTPRequestConfig) ; i++) { if (args.at(0) == g_requestConfig[i].request_string) { m_Msg.request = g_requestConfig[i].request_type; } } args.clear(); return 1; } int HTTPConnection::parseHeader(char *buffer) { // Check if the buffer is invalid or if the content is too short to be meaningful if ((strlen(buffer) <3) || (buffer == NULL)) return -1; // decompose string into a touple of <field name> : <field value> int value_start = 0; int buflen = strlen(buffer)+1; for (int i = 0 ; i < buflen ; i++) { if (buffer[i] == ':') { // touple found buffer[i] = 0; value_start = i+1; m_Msg.headers[buffer] = &buffer[value_start]; INFO("Header name=\"%s\" : value=\"%s\".", buffer, &buffer[value_start]); return 0; } } ERR("Did not recieve a valid header : \"%s\".", buffer); return -1; } int HTTPConnection::parseUriArgs(char *buffer, map<string,string>&args) { // Check if the buffer is invalid or if the content is too short to be meaningful if ((strlen(buffer) <3) || (buffer == NULL)) return -1; int args_start = -1; int value_start = -1; int buflen = strlen(buffer) +1; const char* argname = NULL; const char* valuename = NULL; for (int i = 0; i < buflen ; i++) { if (args_start == -1) { // args section not yet found if (buffer[i] == '?') { // starts with a question mark, so got it buffer[i] = 0; args_start = i; // set the start of the args section INFO("Argument section found !"); } } else { // search arg-value touples if (argname == NULL) { // arg-name found ? if (buffer[i] == '=') { // yes, separate the arg-name buffer[i] = 0; argname = &buffer[args_start]; value_start = i+1; INFO("Argument name %s", argname); } } else { // search for end of value if ((buffer[i] == '&') || (buffer[i] == 0) || (buffer[i] == '\r') || (buffer[i] == '\n')) { buffer[i] = 0; valuename = &buffer[value_start]; INFO("Argument value %s", valuename); args[argname] = valuename; // reset all indicators argname = NULL; valuename = NULL; } } } } return 0; }