File content as of revision 0:ac1725ba162c:

/*
Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com)
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

#include "core/netservice.h"
#include "HTTPRequestHandler.h"

#include <string.h>

//#define __DEBUG
#include "dbg/dbg.h"

#define HTTP_REQUEST_TIMEOUT 5000

HTTPRequestHandler::HTTPRequestHandler(const char* rootPath, const char* path, TCPSocket* pTCPSocket) : NetService(), 
m_pTCPSocket(pTCPSocket), m_reqHeaders(), m_respHeaders(),
m_rootPath(rootPath), m_path(path), m_errc(200),
m_watchdog(), m_timeout(0), m_closed(false), m_headersSent(false) //OK
{
  //Read & parse headers
  readHeaders();
  m_pTCPSocket->setOnEvent(this, &HTTPRequestHandler::onTCPSocketEvent);
  setTimeout(HTTP_REQUEST_TIMEOUT);
}

HTTPRequestHandler::~HTTPRequestHandler()
{
  close();
}

void HTTPRequestHandler::onTimeout() //Connection has timed out
{
  close();
}

void HTTPRequestHandler::close() //Close socket and destroy data
{
  if(m_closed)
    return;
  m_closed = true; //Prevent recursive calling or calling on an object being destructed by someone else
  m_watchdog.detach();
  onClose();
  m_pTCPSocket->resetOnEvent();
  m_pTCPSocket->close();
  delete m_pTCPSocket; //Can safely destroy socket
  NetService::close();
}

map<string, string>& HTTPRequestHandler::reqHeaders() //const
{
  return m_reqHeaders;
}

string& HTTPRequestHandler::path() //const
{
  return m_path;
}

int HTTPRequestHandler::dataLen() const
{
  map<string,string>::iterator it;
  it = m_reqHeaders.find("Content-Length");
  if( it == m_reqHeaders.end() )
  {
    return 0;
  }
  return atoi((*it).second.c_str()); //return 0 if parse fails, so that's fine
}

int HTTPRequestHandler::readData(char* buf, int len)
{
  return m_pTCPSocket->recv(buf, len);
}

string& HTTPRequestHandler::rootPath() //const
{
  return m_rootPath;
}

void HTTPRequestHandler::setErrCode(int errc)
{
  m_errc = errc;
}

void HTTPRequestHandler::setContentLen(int len)
{
  char len_str[6] = {0};
  sprintf(len_str, "%d", len);
  respHeaders()["Content-Length"] = len_str;
}
  
map<string, string>& HTTPRequestHandler::respHeaders()
{
  return m_respHeaders;
}

int HTTPRequestHandler::writeData(const char* buf, int len)
{
  if(!m_headersSent)
  {
    m_headersSent = true;
    writeHeaders();
  }
  
  return m_pTCPSocket->send(buf, len);
}

void HTTPRequestHandler::setTimeout(int ms)
{
  m_timeout = 1000*ms;
  resetTimeout();
}

void HTTPRequestHandler::resetTimeout()
{
  m_watchdog.detach();
  m_watchdog.attach_us<HTTPRequestHandler>(this, &HTTPRequestHandler::onTimeout, m_timeout);
}


void HTTPRequestHandler::readHeaders()
{
  static char line[128];
  static char key[128];
  static char value[128];
  while( readLine(line, 128) > 0) //if == 0, it is an empty line = end of headers
  {
    int n = sscanf(line, "%[^:]: %[^\n]", key, value);
    if ( n == 2 )
    {
      DBG("\r\nRead header : %s : %s\r\n", key, value);
      m_reqHeaders[key] = value;
    }
    //TODO: Impl n==1 case (part 2 of previous header)
  }
}

void HTTPRequestHandler::writeHeaders() //Called at the first writeData call
{
  static char line[128];
  
  //Response line
  sprintf(line, "HTTP/1.1 %d MbedInfo\r\n", m_errc); //Not a violation of the standard not to include the descriptive text
  m_pTCPSocket->send(line, strlen(line));
  
  map<string,string>::iterator it;
  while( !m_respHeaders.empty() )
  {
    it = m_respHeaders.begin();
    sprintf(line, "%s: %s\r\n", (*it).first.c_str(), (*it).second.c_str() );
    DBG("\r\n%s", line);
    m_pTCPSocket->send(line, strlen(line));
    m_respHeaders.erase(it);
  }
  m_pTCPSocket->send("\r\n",2); //End of head
}

int HTTPRequestHandler::readLine(char* str, int maxLen)
{
  int ret;
  int len = 0;
  for(int i = 0; i < maxLen - 1; i++)
  {
    ret = m_pTCPSocket->recv(str, 1);
    if(!ret)
    {
      break;
    }
    if( (len > 1) && *(str-1)=='\r' && *str=='\n' )
    {
      str--;
      len-=2;
      break;
    }
    else if( *str=='\n' )
    {
      len--;
      break;    
    }
    str++;
    len++;
  }
  *str = 0;
  return len;
}

void HTTPRequestHandler::onTCPSocketEvent(TCPSocketEvent e)
{
   
  DBG("\r\nEvent %d in HTTPRequestHandler\r\n", e);

  if(m_closed)
  {
    DBG("\r\nWARN: Discarded\r\n");
    return;
  }

  switch(e)
  {
  case TCPSOCKET_READABLE:
    resetTimeout();
    onReadable();
    break;
  case TCPSOCKET_WRITEABLE:
    resetTimeout();
    onWriteable();    
    break;
  case TCPSOCKET_CONTIMEOUT:
  case TCPSOCKET_CONRST:
  case TCPSOCKET_CONABRT:
  case TCPSOCKET_ERROR:
  case TCPSOCKET_DISCONNECTED:
    DBG("\r\nConnection error in handler\r\n");
    close();
    break;
  }
  
}