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.

Committer:
leihen
Date:
Sun May 26 22:49:42 2013 +0000
Revision:
1:6b7472d5e9ee
Parent:
0:7a2421e63e74
Child:
2:8653bbcf7e58
Basic functionality demonstrated. One issue exists with error pages, which does not work 100%
;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
leihen 0:7a2421e63e74 1 /* HTTPConnection.cpp */
leihen 0:7a2421e63e74 2
leihen 0:7a2421e63e74 3 #include "mbed.h"
leihen 0:7a2421e63e74 4 #include "HTTPConnection.h"
leihen 0:7a2421e63e74 5
leihen 0:7a2421e63e74 6 #include <vector>
leihen 0:7a2421e63e74 7 using std::vector;
leihen 0:7a2421e63e74 8
leihen 0:7a2421e63e74 9 using std::string;
leihen 0:7a2421e63e74 10
leihen 1:6b7472d5e9ee 11 #if (0 && !defined(TARGET_LPC11U24))
leihen 0:7a2421e63e74 12 #define INFO(x, ...) std::printf("[HttpConnection : INFO]"x"\r\n", ##__VA_ARGS__);
leihen 0:7a2421e63e74 13 #define WARN(x, ...) std::printf("[HttpConnection : WARN]"x"\r\n", ##__VA_ARGS__);
leihen 0:7a2421e63e74 14 #define ERR(x, ...) std::printf("[HttpConnection : ERR]"x"\r\n", ##__VA_ARGS__);
leihen 0:7a2421e63e74 15 #else
leihen 0:7a2421e63e74 16 #define INFO(x, ...)
leihen 0:7a2421e63e74 17 #define WARN(x, ...)
leihen 0:7a2421e63e74 18 #define ERR(x, ...)
leihen 0:7a2421e63e74 19 #endif
leihen 0:7a2421e63e74 20
leihen 0:7a2421e63e74 21
leihen 0:7a2421e63e74 22
leihen 0:7a2421e63e74 23
leihen 0:7a2421e63e74 24 HTTPConnection::HTTPConnection()
leihen 0:7a2421e63e74 25 {
leihen 0:7a2421e63e74 26 }
leihen 0:7a2421e63e74 27
leihen 0:7a2421e63e74 28
leihen 0:7a2421e63e74 29 HTTPConnection::~HTTPConnection()
leihen 0:7a2421e63e74 30 {
leihen 0:7a2421e63e74 31 close();
leihen 0:7a2421e63e74 32 }
leihen 0:7a2421e63e74 33
leihen 0:7a2421e63e74 34 void HTTPConnection::close()
leihen 0:7a2421e63e74 35 {
leihen 0:7a2421e63e74 36 m_Msg.headers.clear();
leihen 0:7a2421e63e74 37 }
leihen 0:7a2421e63e74 38
leihen 0:7a2421e63e74 39 int HTTPConnection::poll()
leihen 0:7a2421e63e74 40 {
leihen 0:7a2421e63e74 41 static char buffer[256] = {};
leihen 0:7a2421e63e74 42 static char echoHeader[256] = {};
leihen 0:7a2421e63e74 43
leihen 0:7a2421e63e74 44
leihen 0:7a2421e63e74 45 int rcvd= 0;
leihen 0:7a2421e63e74 46 INFO("[HTTPConnection]Waiting for new data in connection");
leihen 0:7a2421e63e74 47 // Try receiving request line
leihen 0:7a2421e63e74 48 rcvd = receiveLine(buffer, 255, 3000);
leihen 0:7a2421e63e74 49 if (rcvd == -1) {
leihen 0:7a2421e63e74 50 // there was an error, probably the connection was closed, so close this connection as well
leihen 0:7a2421e63e74 51 INFO("No more data available. Will close this connection now.");
leihen 0:7a2421e63e74 52 close();
leihen 0:7a2421e63e74 53 return -1;
leihen 0:7a2421e63e74 54 }
leihen 0:7a2421e63e74 55
leihen 0:7a2421e63e74 56 // The Request has not yet been received so try it
leihen 0:7a2421e63e74 57 rcvd = parse(buffer);
leihen 0:7a2421e63e74 58 if (rcvd == -1) {
leihen 0:7a2421e63e74 59 // Invalid content received, so close the connection
leihen 0:7a2421e63e74 60 INFO("Invalid message received, so sending negative response and closing connection !");
leihen 0:7a2421e63e74 61 sprintf(echoHeader,"HTTP/1.1 400 NOK\n\rContent-Length: %d\n\rContent-Type: text\n\rConnection: Close\n\r\n\r",strlen(buffer));
leihen 0:7a2421e63e74 62 m_Tcp.set_blocking(true, 1500);
leihen 0:7a2421e63e74 63 m_Tcp.send(echoHeader,strlen(echoHeader));
leihen 0:7a2421e63e74 64 m_Tcp.send(buffer,strlen(buffer));
leihen 0:7a2421e63e74 65 close();
leihen 0:7a2421e63e74 66 rcvd = -1;
leihen 0:7a2421e63e74 67 return -1;
leihen 0:7a2421e63e74 68 }
leihen 0:7a2421e63e74 69 // The request has been received, try receive the body
leihen 0:7a2421e63e74 70 while(rcvd > 0) {
leihen 0:7a2421e63e74 71 rcvd = receiveLine((char*)buffer, 255, 3000);
leihen 0:7a2421e63e74 72 // First check if we received an empty line. This would indicate the end of the message or message body.
leihen 0:7a2421e63e74 73 if (rcvd < 0) {
leihen 0:7a2421e63e74 74 // there was an empty line, so we can start with performing the request
leihen 0:7a2421e63e74 75 INFO("Request Header was received completely. Performing request.");
leihen 0:7a2421e63e74 76 rcvd = 0;
leihen 0:7a2421e63e74 77 break;
leihen 0:7a2421e63e74 78 }
leihen 0:7a2421e63e74 79 else {
leihen 0:7a2421e63e74 80 // add message body
leihen 0:7a2421e63e74 81 if (parseHeader(buffer) == 0) {
leihen 0:7a2421e63e74 82 }
leihen 0:7a2421e63e74 83 else {
leihen 0:7a2421e63e74 84 WARN("Invalid message header received !");
leihen 0:7a2421e63e74 85 }
leihen 0:7a2421e63e74 86 }
leihen 0:7a2421e63e74 87 }
leihen 0:7a2421e63e74 88 if (rcvd == 0) {
leihen 1:6b7472d5e9ee 89 // sprintf(echoHeader,"HTTP/1.1 200 OK\n\rContent-Length: %d\n\rContent-Type: text\n\rConnection: Close\n\r\n\r",strlen(buffer));
leihen 1:6b7472d5e9ee 90 // m_Tcp.set_blocking(true);
leihen 1:6b7472d5e9ee 91 // m_Tcp.send_all(echoHeader,strlen(echoHeader));
leihen 1:6b7472d5e9ee 92 // m_Tcp.send_all(buffer,strlen(buffer));
leihen 0:7a2421e63e74 93
leihen 0:7a2421e63e74 94 /// INSERT PRCESSING OF REQUESST HERE
leihen 0:7a2421e63e74 95 /// END OF PROCESSING REQUEST
leihen 0:7a2421e63e74 96
leihen 0:7a2421e63e74 97 // Do not close the connection, it may be reused
leihen 0:7a2421e63e74 98 }
leihen 0:7a2421e63e74 99 INFO("Leaving poll function!");
leihen 0:7a2421e63e74 100 return rcvd;
leihen 0:7a2421e63e74 101 }
leihen 0:7a2421e63e74 102
leihen 0:7a2421e63e74 103 int HTTPConnection::receiveLine(char* szLine, int nMaxLen, int nTimeout, char cLineTerm)
leihen 0:7a2421e63e74 104 {
leihen 0:7a2421e63e74 105 if ((szLine == NULL) || (nMaxLen == 0))
leihen 0:7a2421e63e74 106 return -1;
leihen 0:7a2421e63e74 107
leihen 0:7a2421e63e74 108 m_Tcp.set_blocking(false);
leihen 0:7a2421e63e74 109
leihen 0:7a2421e63e74 110 Timer tm;
leihen 0:7a2421e63e74 111 int i;
leihen 0:7a2421e63e74 112
leihen 0:7a2421e63e74 113 // Try to receive up to the max number of characters
leihen 0:7a2421e63e74 114 for (i = 0 ; i < nMaxLen-1 ; i++) {
leihen 0:7a2421e63e74 115 int c;
leihen 0:7a2421e63e74 116 c = m_Tcp.receive_all( szLine + i, 1 );
leihen 0:7a2421e63e74 117 // Check that - if no character was currently received - the timeout period is reached.
leihen 0:7a2421e63e74 118 if ((c == 0) || (c==-1)) {
leihen 0:7a2421e63e74 119 // no character was read, so check if operation timed out
leihen 0:7a2421e63e74 120 if (tm.read_ms() > nTimeout) {
leihen 0:7a2421e63e74 121 // Operation timed out
leihen 0:7a2421e63e74 122 INFO("Timeout occured in function 'receiveLine'.");
leihen 0:7a2421e63e74 123 return -1;
leihen 0:7a2421e63e74 124 }
leihen 0:7a2421e63e74 125 }
leihen 0:7a2421e63e74 126
leihen 0:7a2421e63e74 127 // Check if line terminating character was received
leihen 0:7a2421e63e74 128 if (szLine[i] == cLineTerm)
leihen 0:7a2421e63e74 129 break;
leihen 0:7a2421e63e74 130 }
leihen 0:7a2421e63e74 131 // Terminate with \0
leihen 0:7a2421e63e74 132 szLine[i] = 0;
leihen 0:7a2421e63e74 133
leihen 0:7a2421e63e74 134 // Trim for '\r' linefeed at the end
leihen 0:7a2421e63e74 135 if( (i >0) && (szLine[i-1] == '\r')) {
leihen 0:7a2421e63e74 136 i--;
leihen 0:7a2421e63e74 137 szLine[i] = 0;
leihen 0:7a2421e63e74 138 }
leihen 0:7a2421e63e74 139 INFO("receiveLine : \"%s\".", szLine);
leihen 0:7a2421e63e74 140
leihen 0:7a2421e63e74 141 // return number of characters received in the line or return -2 if an empty line was received
leihen 0:7a2421e63e74 142 if ((i == 0) || ((i==1) &&(szLine[0] == '\r')))
leihen 0:7a2421e63e74 143 {
leihen 0:7a2421e63e74 144 // empty line received, so return -2
leihen 0:7a2421e63e74 145 return -2;
leihen 0:7a2421e63e74 146 }
leihen 0:7a2421e63e74 147 return i;
leihen 0:7a2421e63e74 148 }
leihen 0:7a2421e63e74 149
leihen 0:7a2421e63e74 150 int HTTPConnection::parse(const char* buffer)
leihen 0:7a2421e63e74 151 {
leihen 0:7a2421e63e74 152 if ((buffer == NULL) || (strlen(buffer) < 4)) {
leihen 0:7a2421e63e74 153 ERR("Buffer content is invalid or too short.");
leihen 0:7a2421e63e74 154 return -1;
leihen 0:7a2421e63e74 155 }
leihen 0:7a2421e63e74 156
leihen 0:7a2421e63e74 157 vector<std::string> args;
leihen 0:7a2421e63e74 158 args.clear();
leihen 0:7a2421e63e74 159
leihen 0:7a2421e63e74 160 // decompose string into a list of arguments
leihen 0:7a2421e63e74 161 char s = 0; // current starting char
leihen 0:7a2421e63e74 162 static char buff[255] = {};
leihen 0:7a2421e63e74 163 for (int i = 0 ; i < strlen(buffer)+1 ; i++) {
leihen 0:7a2421e63e74 164 if ((buffer[i] == ' ') || (buffer[i] == '\n') || (buffer[i] == 0)) {
leihen 0:7a2421e63e74 165 // new arg found
leihen 0:7a2421e63e74 166 strncpy(buff, &buffer[s], i-s);
leihen 0:7a2421e63e74 167 buff[i-s] = 0;
leihen 0:7a2421e63e74 168 INFO("Found argument \"%s\"", buff);
leihen 0:7a2421e63e74 169 args.push_back(std::string(buff));
leihen 0:7a2421e63e74 170 s = i+1;
leihen 0:7a2421e63e74 171 }
leihen 0:7a2421e63e74 172 }
leihen 0:7a2421e63e74 173
leihen 0:7a2421e63e74 174 if (args.at(0) == "GET") {
leihen 0:7a2421e63e74 175 m_Msg.request = HTTP_RT_GET;
leihen 0:7a2421e63e74 176 m_Msg.uri = args[1];
leihen 0:7a2421e63e74 177 m_Msg.version = args[2];
leihen 0:7a2421e63e74 178 }
leihen 0:7a2421e63e74 179 else {
leihen 0:7a2421e63e74 180 if (args.at(0) == "POST") {
leihen 0:7a2421e63e74 181 m_Msg.request = HTTP_RT_GET;
leihen 0:7a2421e63e74 182 m_Msg.uri = args[1];
leihen 0:7a2421e63e74 183 m_Msg.version = args[2];
leihen 0:7a2421e63e74 184 }
leihen 0:7a2421e63e74 185 else {
leihen 0:7a2421e63e74 186 INFO("unhandled message.");
leihen 0:7a2421e63e74 187 }
leihen 0:7a2421e63e74 188 }
leihen 0:7a2421e63e74 189 args.clear();
leihen 0:7a2421e63e74 190
leihen 0:7a2421e63e74 191 return 1;
leihen 0:7a2421e63e74 192 }
leihen 0:7a2421e63e74 193
leihen 0:7a2421e63e74 194
leihen 0:7a2421e63e74 195 int HTTPConnection::parseHeader(const char *buffer)
leihen 0:7a2421e63e74 196 {
leihen 0:7a2421e63e74 197 if ((strlen(buffer) <3) || (buffer == NULL))
leihen 0:7a2421e63e74 198 return -1;
leihen 0:7a2421e63e74 199
leihen 0:7a2421e63e74 200 // decompose string into a touple of <field name> : <field value>
leihen 0:7a2421e63e74 201 static char fieldname[256] = {};
leihen 0:7a2421e63e74 202 static char fieldvalue[256] = {};
leihen 0:7a2421e63e74 203 for (int i = 0 ; i < strlen(buffer)+1 ; i++) {
leihen 0:7a2421e63e74 204 if (buffer[i] == ':') {
leihen 0:7a2421e63e74 205 // touple found
leihen 0:7a2421e63e74 206 strncpy(fieldname, buffer, i);
leihen 0:7a2421e63e74 207 fieldname[i] = 0;
leihen 0:7a2421e63e74 208 strcpy(fieldvalue, &buffer[i+1]);
leihen 0:7a2421e63e74 209
leihen 0:7a2421e63e74 210 // m_Msg.headers[fieldname] = fieldvalue;
leihen 0:7a2421e63e74 211
leihen 0:7a2421e63e74 212 INFO("Header name=\"%s\" : value=\"%s\".", fieldname, fieldvalue);
leihen 0:7a2421e63e74 213 return 0;
leihen 0:7a2421e63e74 214 }
leihen 0:7a2421e63e74 215 }
leihen 0:7a2421e63e74 216
leihen 0:7a2421e63e74 217 ERR("Did not recieve a valid header : \"%s\".", buffer);
leihen 0:7a2421e63e74 218 return -1;
leihen 0:7a2421e63e74 219 }