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HTTPConnection.cpp@2:8653bbcf7e58, 2013-05-26 (annotated)
- Committer:
- leihen
- Date:
- Sun May 26 23:22:36 2013 +0000
- Revision:
- 2:8653bbcf7e58
- Parent:
- 1:6b7472d5e9ee
- Child:
- 3:d6224049b3bf
Optimized for RAM.
Who changed what in which revision?
User | Revision | Line number | New 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 | 2:8653bbcf7e58 | 11 | #if (1 && !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 | |
leihen | 0:7a2421e63e74 | 43 | |
leihen | 0:7a2421e63e74 | 44 | int rcvd= 0; |
leihen | 0:7a2421e63e74 | 45 | INFO("[HTTPConnection]Waiting for new data in connection"); |
leihen | 0:7a2421e63e74 | 46 | // Try receiving request line |
leihen | 0:7a2421e63e74 | 47 | rcvd = receiveLine(buffer, 255, 3000); |
leihen | 0:7a2421e63e74 | 48 | if (rcvd == -1) { |
leihen | 0:7a2421e63e74 | 49 | // there was an error, probably the connection was closed, so close this connection as well |
leihen | 0:7a2421e63e74 | 50 | INFO("No more data available. Will close this connection now."); |
leihen | 0:7a2421e63e74 | 51 | close(); |
leihen | 0:7a2421e63e74 | 52 | return -1; |
leihen | 0:7a2421e63e74 | 53 | } |
leihen | 0:7a2421e63e74 | 54 | |
leihen | 0:7a2421e63e74 | 55 | // The Request has not yet been received so try it |
leihen | 0:7a2421e63e74 | 56 | rcvd = parse(buffer); |
leihen | 0:7a2421e63e74 | 57 | if (rcvd == -1) { |
leihen | 0:7a2421e63e74 | 58 | // Invalid content received, so close the connection |
leihen | 0:7a2421e63e74 | 59 | INFO("Invalid message received, so sending negative response and closing connection !"); |
leihen | 2:8653bbcf7e58 | 60 | sprintf(buffer,"HTTP/1.1 400 NOK\n\rContent-Length: %d\n\rContent-Type: text\n\rConnection: Close\n\r\n\r",0); |
leihen | 0:7a2421e63e74 | 61 | m_Tcp.set_blocking(true, 1500); |
leihen | 0:7a2421e63e74 | 62 | m_Tcp.send(buffer,strlen(buffer)); |
leihen | 0:7a2421e63e74 | 63 | close(); |
leihen | 0:7a2421e63e74 | 64 | rcvd = -1; |
leihen | 0:7a2421e63e74 | 65 | return -1; |
leihen | 0:7a2421e63e74 | 66 | } |
leihen | 0:7a2421e63e74 | 67 | // The request has been received, try receive the body |
leihen | 0:7a2421e63e74 | 68 | while(rcvd > 0) { |
leihen | 0:7a2421e63e74 | 69 | rcvd = receiveLine((char*)buffer, 255, 3000); |
leihen | 0:7a2421e63e74 | 70 | // First check if we received an empty line. This would indicate the end of the message or message body. |
leihen | 0:7a2421e63e74 | 71 | if (rcvd < 0) { |
leihen | 0:7a2421e63e74 | 72 | // there was an empty line, so we can start with performing the request |
leihen | 0:7a2421e63e74 | 73 | INFO("Request Header was received completely. Performing request."); |
leihen | 0:7a2421e63e74 | 74 | rcvd = 0; |
leihen | 0:7a2421e63e74 | 75 | break; |
leihen | 0:7a2421e63e74 | 76 | } |
leihen | 0:7a2421e63e74 | 77 | else { |
leihen | 0:7a2421e63e74 | 78 | // add message body |
leihen | 0:7a2421e63e74 | 79 | if (parseHeader(buffer) == 0) { |
leihen | 0:7a2421e63e74 | 80 | } |
leihen | 0:7a2421e63e74 | 81 | else { |
leihen | 0:7a2421e63e74 | 82 | WARN("Invalid message header received !"); |
leihen | 0:7a2421e63e74 | 83 | } |
leihen | 0:7a2421e63e74 | 84 | } |
leihen | 0:7a2421e63e74 | 85 | } |
leihen | 0:7a2421e63e74 | 86 | INFO("Leaving poll function!"); |
leihen | 0:7a2421e63e74 | 87 | return rcvd; |
leihen | 0:7a2421e63e74 | 88 | } |
leihen | 0:7a2421e63e74 | 89 | |
leihen | 0:7a2421e63e74 | 90 | int HTTPConnection::receiveLine(char* szLine, int nMaxLen, int nTimeout, char cLineTerm) |
leihen | 0:7a2421e63e74 | 91 | { |
leihen | 0:7a2421e63e74 | 92 | if ((szLine == NULL) || (nMaxLen == 0)) |
leihen | 0:7a2421e63e74 | 93 | return -1; |
leihen | 0:7a2421e63e74 | 94 | |
leihen | 0:7a2421e63e74 | 95 | m_Tcp.set_blocking(false); |
leihen | 0:7a2421e63e74 | 96 | |
leihen | 0:7a2421e63e74 | 97 | Timer tm; |
leihen | 0:7a2421e63e74 | 98 | int i; |
leihen | 0:7a2421e63e74 | 99 | |
leihen | 0:7a2421e63e74 | 100 | // Try to receive up to the max number of characters |
leihen | 0:7a2421e63e74 | 101 | for (i = 0 ; i < nMaxLen-1 ; i++) { |
leihen | 0:7a2421e63e74 | 102 | int c; |
leihen | 0:7a2421e63e74 | 103 | c = m_Tcp.receive_all( szLine + i, 1 ); |
leihen | 0:7a2421e63e74 | 104 | // Check that - if no character was currently received - the timeout period is reached. |
leihen | 0:7a2421e63e74 | 105 | if ((c == 0) || (c==-1)) { |
leihen | 0:7a2421e63e74 | 106 | // no character was read, so check if operation timed out |
leihen | 0:7a2421e63e74 | 107 | if (tm.read_ms() > nTimeout) { |
leihen | 0:7a2421e63e74 | 108 | // Operation timed out |
leihen | 0:7a2421e63e74 | 109 | INFO("Timeout occured in function 'receiveLine'."); |
leihen | 0:7a2421e63e74 | 110 | return -1; |
leihen | 0:7a2421e63e74 | 111 | } |
leihen | 0:7a2421e63e74 | 112 | } |
leihen | 0:7a2421e63e74 | 113 | |
leihen | 0:7a2421e63e74 | 114 | // Check if line terminating character was received |
leihen | 0:7a2421e63e74 | 115 | if (szLine[i] == cLineTerm) |
leihen | 0:7a2421e63e74 | 116 | break; |
leihen | 0:7a2421e63e74 | 117 | } |
leihen | 0:7a2421e63e74 | 118 | // Terminate with \0 |
leihen | 0:7a2421e63e74 | 119 | szLine[i] = 0; |
leihen | 0:7a2421e63e74 | 120 | |
leihen | 0:7a2421e63e74 | 121 | // Trim for '\r' linefeed at the end |
leihen | 0:7a2421e63e74 | 122 | if( (i >0) && (szLine[i-1] == '\r')) { |
leihen | 0:7a2421e63e74 | 123 | i--; |
leihen | 0:7a2421e63e74 | 124 | szLine[i] = 0; |
leihen | 0:7a2421e63e74 | 125 | } |
leihen | 0:7a2421e63e74 | 126 | INFO("receiveLine : \"%s\".", szLine); |
leihen | 0:7a2421e63e74 | 127 | |
leihen | 0:7a2421e63e74 | 128 | // return number of characters received in the line or return -2 if an empty line was received |
leihen | 0:7a2421e63e74 | 129 | if ((i == 0) || ((i==1) &&(szLine[0] == '\r'))) |
leihen | 0:7a2421e63e74 | 130 | { |
leihen | 0:7a2421e63e74 | 131 | // empty line received, so return -2 |
leihen | 0:7a2421e63e74 | 132 | return -2; |
leihen | 0:7a2421e63e74 | 133 | } |
leihen | 0:7a2421e63e74 | 134 | return i; |
leihen | 0:7a2421e63e74 | 135 | } |
leihen | 0:7a2421e63e74 | 136 | |
leihen | 2:8653bbcf7e58 | 137 | int HTTPConnection::parse(char* buffer) |
leihen | 0:7a2421e63e74 | 138 | { |
leihen | 0:7a2421e63e74 | 139 | if ((buffer == NULL) || (strlen(buffer) < 4)) { |
leihen | 0:7a2421e63e74 | 140 | ERR("Buffer content is invalid or too short."); |
leihen | 0:7a2421e63e74 | 141 | return -1; |
leihen | 0:7a2421e63e74 | 142 | } |
leihen | 0:7a2421e63e74 | 143 | |
leihen | 0:7a2421e63e74 | 144 | vector<std::string> args; |
leihen | 0:7a2421e63e74 | 145 | args.clear(); |
leihen | 0:7a2421e63e74 | 146 | |
leihen | 0:7a2421e63e74 | 147 | // decompose string into a list of arguments |
leihen | 0:7a2421e63e74 | 148 | char s = 0; // current starting char |
leihen | 2:8653bbcf7e58 | 149 | int nLen = strlen(buffer)+1; |
leihen | 2:8653bbcf7e58 | 150 | for (int i = 0 ; i < nLen ; i++) { |
leihen | 0:7a2421e63e74 | 151 | if ((buffer[i] == ' ') || (buffer[i] == '\n') || (buffer[i] == 0)) { |
leihen | 0:7a2421e63e74 | 152 | // new arg found |
leihen | 2:8653bbcf7e58 | 153 | buffer[i] = 0; |
leihen | 2:8653bbcf7e58 | 154 | INFO("Found argument \"%s\"", &buffer[s]); |
leihen | 2:8653bbcf7e58 | 155 | args.push_back(&buffer[s]); |
leihen | 0:7a2421e63e74 | 156 | s = i+1; |
leihen | 0:7a2421e63e74 | 157 | } |
leihen | 0:7a2421e63e74 | 158 | } |
leihen | 0:7a2421e63e74 | 159 | |
leihen | 0:7a2421e63e74 | 160 | if (args.at(0) == "GET") { |
leihen | 0:7a2421e63e74 | 161 | m_Msg.request = HTTP_RT_GET; |
leihen | 0:7a2421e63e74 | 162 | m_Msg.uri = args[1]; |
leihen | 0:7a2421e63e74 | 163 | m_Msg.version = args[2]; |
leihen | 0:7a2421e63e74 | 164 | } |
leihen | 0:7a2421e63e74 | 165 | else { |
leihen | 0:7a2421e63e74 | 166 | if (args.at(0) == "POST") { |
leihen | 0:7a2421e63e74 | 167 | m_Msg.request = HTTP_RT_GET; |
leihen | 0:7a2421e63e74 | 168 | m_Msg.uri = args[1]; |
leihen | 0:7a2421e63e74 | 169 | m_Msg.version = args[2]; |
leihen | 0:7a2421e63e74 | 170 | } |
leihen | 0:7a2421e63e74 | 171 | else { |
leihen | 0:7a2421e63e74 | 172 | INFO("unhandled message."); |
leihen | 0:7a2421e63e74 | 173 | } |
leihen | 0:7a2421e63e74 | 174 | } |
leihen | 0:7a2421e63e74 | 175 | args.clear(); |
leihen | 0:7a2421e63e74 | 176 | |
leihen | 0:7a2421e63e74 | 177 | return 1; |
leihen | 0:7a2421e63e74 | 178 | } |
leihen | 0:7a2421e63e74 | 179 | |
leihen | 0:7a2421e63e74 | 180 | |
leihen | 0:7a2421e63e74 | 181 | int HTTPConnection::parseHeader(const char *buffer) |
leihen | 0:7a2421e63e74 | 182 | { |
leihen | 0:7a2421e63e74 | 183 | if ((strlen(buffer) <3) || (buffer == NULL)) |
leihen | 0:7a2421e63e74 | 184 | return -1; |
leihen | 0:7a2421e63e74 | 185 | |
leihen | 0:7a2421e63e74 | 186 | // decompose string into a touple of <field name> : <field value> |
leihen | 0:7a2421e63e74 | 187 | static char fieldname[256] = {}; |
leihen | 0:7a2421e63e74 | 188 | static char fieldvalue[256] = {}; |
leihen | 0:7a2421e63e74 | 189 | for (int i = 0 ; i < strlen(buffer)+1 ; i++) { |
leihen | 0:7a2421e63e74 | 190 | if (buffer[i] == ':') { |
leihen | 0:7a2421e63e74 | 191 | // touple found |
leihen | 0:7a2421e63e74 | 192 | strncpy(fieldname, buffer, i); |
leihen | 0:7a2421e63e74 | 193 | fieldname[i] = 0; |
leihen | 0:7a2421e63e74 | 194 | strcpy(fieldvalue, &buffer[i+1]); |
leihen | 0:7a2421e63e74 | 195 | |
leihen | 0:7a2421e63e74 | 196 | // m_Msg.headers[fieldname] = fieldvalue; |
leihen | 0:7a2421e63e74 | 197 | |
leihen | 0:7a2421e63e74 | 198 | INFO("Header name=\"%s\" : value=\"%s\".", fieldname, fieldvalue); |
leihen | 0:7a2421e63e74 | 199 | return 0; |
leihen | 0:7a2421e63e74 | 200 | } |
leihen | 0:7a2421e63e74 | 201 | } |
leihen | 0:7a2421e63e74 | 202 | |
leihen | 0:7a2421e63e74 | 203 | ERR("Did not recieve a valid header : \"%s\".", buffer); |
leihen | 0:7a2421e63e74 | 204 | return -1; |
leihen | 0:7a2421e63e74 | 205 | } |