/* GSWAppConnectSocket.c - GSWeb: Adaptors: App Connection by Socket
   Copyright (C) 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
   
   Written by:	Manuel Guesdon <mguesdon@sbuilders.com>
   Date: 	July 1999
   
   This file is part of the GNUstep Web Library.
   
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.
   
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.
   
   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/socket.h>
#include <errno.h>
#include <unistd.h>

#include "config.h"
#include "GSWUtil.h"
#include "GSWStats.h"
#include "GSWDict.h"
#include "GSWURLUtil.h"
#include "GSWAppRequestStruct.h"
#include "GSWAppConnect.h"

//--------------------------------------------------------------------
typedef	struct _STAppConnectSocket
{
  int	iSocketDescr;
  FILE* pFileRead;
  FILE* pFileWrite;
} STAppConnectSocket;
typedef STAppConnectSocket* AppConnectSocketHandle;

//--------------------------------------------------------------------
AppConnectHandle GSWApp_Open(GSWAppRequest* p_pAppRequest,void* p_pLogServerData)
{
  AppConnectHandle handle=NULL;

  GSWDebugLog(p_pLogServerData,"Start GSWApp_Open");

  if (!p_pAppRequest)
    {
      GSWLog(__FILE__, __LINE__, GSW_CRITICAL,p_pLogServerData,
             "No AppRequest !");
      //TODO
    }
  else
    {
      PSTHostent pHost = NULL;

      //Stats
      GSWAssert(p_pAppRequest->pStats,p_pLogServerData,"No p_pAppRequest->pStats");
      if (!p_pAppRequest->pStats->_tryContactingAppInstanceTS)
        p_pAppRequest->pStats->_tryContactingAppInstanceTS=GSWTime_now();

      p_pAppRequest->pStats->_tryContactingAppInstanceCount++;
      
      pHost=GSWUtil_FindHost(p_pAppRequest->pszHost,p_pLogServerData);
      if (!pHost)
        {
          GSWLog(__FILE__, __LINE__, GSW_ERROR,p_pLogServerData,
                 "gethostbyname(%s) returns no host",
                 p_pAppRequest->pszHost);
        }
      else
        {
          int iSocketDescr = 0;
          struct sockaddr_in sin;
          memset(&sin,0,sizeof(sin));
          sin.sin_family = pHost->h_addrtype;
          sin.sin_port = htons(p_pAppRequest->iPort);
          memcpy(&sin.sin_addr,pHost->h_addr_list[0],pHost->h_length);
          GSWDebugLog(p_pLogServerData,
                      "Try contacting %s on port %d...",
                      p_pAppRequest->pszHost,
                      p_pAppRequest->iPort);
          iSocketDescr=socket(pHost->h_addrtype,SOCK_STREAM, 0);
          if (iSocketDescr<0)
            {
              GSWLog(__FILE__, __LINE__, GSW_ERROR,
                     p_pLogServerData,
                     "Can't Create socket to %s:%d. Error=%d (%s)",
                     p_pAppRequest->pszHost,
                     p_pAppRequest->iPort,
                     errno,
                     strerror(errno));
            }
          else
            {
              if (connect(iSocketDescr,(struct sockaddr*)&sin,sizeof(sin))<0)
                {
                  GSWLog(__FILE__, __LINE__, GSW_ERROR,
                         p_pLogServerData,
                         "Can't connect to %s:%d. Error=%d (%s)",
                         p_pAppRequest->pszHost,
                         p_pAppRequest->iPort,
                         errno,
                         strerror(errno));
                  close(iSocketDescr);
                  iSocketDescr=0;
                }
              else
                {
                  FILE* pFileRead=fdopen(iSocketDescr,"r");
                  if (!pFileRead)
                    {
                      GSWLog(__FILE__, __LINE__, GSW_ERROR,
                             p_pLogServerData,
                             "Can't open for reading. Error=%d (%s)",
                             errno,
                             strerror(errno));
                      close(iSocketDescr);
                      iSocketDescr=0;
                    }
                  else
                    {
                      FILE* pFileWrite=fdopen(iSocketDescr,"w");
                      if (!pFileWrite)
                        {
                          GSWLog(__FILE__, __LINE__, GSW_ERROR,
                                 p_pLogServerData,
                                 "Can't open for writing. Error=%d (%s)",
                                 errno,
                                 strerror(errno));
                          fclose(pFileRead);
                          pFileRead=NULL;
                          close(iSocketDescr);
                          iSocketDescr=0;
                        }
                      else
                        {
                          handle = calloc(1, sizeof(STAppConnectSocket));
                          ((AppConnectSocketHandle)handle)->iSocketDescr = iSocketDescr;
                          ((AppConnectSocketHandle)handle)->pFileRead = pFileRead;
                          ((AppConnectSocketHandle)handle)->pFileWrite = pFileWrite;
                        };
                    };
                };
            };
        };
    };

  GSWDebugLog(p_pLogServerData,"Stop GSWApp_Open");

  return handle;
};

//--------------------------------------------------------------------
void GSWApp_Close(AppConnectHandle p_handle,void* p_pLogServerData)
{
  GSWDebugLog(p_pLogServerData,"Start GSWApp_Close ");

  if (!p_handle)
    {
      GSWLog(__FILE__, __LINE__, GSW_CRITICAL,p_pLogServerData,"GSWApp_Close: no Handle !");
    }
  else
    {
      AppConnectSocketHandle handle=(AppConnectSocketHandle)p_handle;
      if (!handle->iSocketDescr)
        {
          GSWLog(__FILE__, __LINE__, GSW_CRITICAL,p_pLogServerData,"GSWApp_Close: no socket desc !");
        }
      else
        {
          close(handle->iSocketDescr);
          fclose(handle->pFileRead);
          fclose(handle->pFileWrite);
        };
      free(handle);
    };
  
  GSWDebugLog(p_pLogServerData,"Stop GSWApp_Close");
};

//--------------------------------------------------------------------
int GSWApp_SendLine(AppConnectHandle p_handle, CONST char* p_pszBuffer,void* p_pLogServerData)
{
  int iRetValue=-1;

  GSWDebugLog(p_pLogServerData,"Start GSWApp_SendLine");

  if (!p_handle)
	{
	  GSWLog(__FILE__, __LINE__, GSW_CRITICAL,p_pLogServerData,"GSWApp_SendLine: no Handle !");
	}
  else
	{
	  AppConnectSocketHandle handle=(AppConnectSocketHandle)p_handle;
	  if (!handle->pFileWrite)
		{
		  GSWLog(__FILE__, __LINE__, GSW_CRITICAL,p_pLogServerData,"GSWApp_SendLine: no write file handle !");
		}
	  else
		{
		  if (fputs(p_pszBuffer,handle->pFileWrite)!=EOF)
			{
			  fflush(handle->pFileWrite);
			  iRetValue=0;
			}
		  else
			{
			  GSWLog(__FILE__, __LINE__, GSW_ERROR,
					 p_pLogServerData,
					 "GSWApp_SendLine failed. Error=%d (%s)",
					 errno,
					 strerror(errno));
			};
		};
	};

  GSWDebugLog(p_pLogServerData,"Stop GSWApp_SendLine");

  return iRetValue;
};


//--------------------------------------------------------------------
int GSWApp_SendBlock(AppConnectHandle p_handle,
                     CONST char* p_pszBuffer,
                     int p_iSize,
                     void* p_pLogServerData)
{
  int iRetValue=-1;
  int iBytesSent=0;

  GSWDebugLog(p_pLogServerData,"Start GSWApp_SendBlock");

  if (!p_handle)
	{
	  GSWLog(__FILE__, __LINE__, GSW_CRITICAL,p_pLogServerData,"GSWApp_SendBlock: no Handle !");
	}
  else
	{
	  AppConnectSocketHandle handle=(AppConnectSocketHandle)p_handle;
	  if (!handle->pFileWrite)
		{
		  GSWLog(__FILE__, __LINE__, GSW_CRITICAL,p_pLogServerData,"GSWApp_SendBlock: no write file handle !");
		}
	  else
		{
		  iBytesSent = fwrite(p_pszBuffer,sizeof(char),p_iSize,handle->pFileWrite);
		  fflush(handle->pFileWrite);		  
		  if (iBytesSent<0)
			{
			  GSWLog(__FILE__, __LINE__, GSW_ERROR,
					 p_pLogServerData,
					 "send failed. Error=%d (%s)",
					 errno,
					 strerror(errno));
			}
		  else
			iRetValue=0;
		};
	};

  GSWDebugLog(p_pLogServerData,"Stop GSWApp_SendBlock");

  return iRetValue;
};

//--------------------------------------------------------------------
int GSWApp_ReceiveLine(AppConnectHandle p_handle,
                       char* p_pszBuffer,
                       int p_iBufferSize,
                       void* p_pLogServerData)
{
  int iRetValue=-1;

  GSWDebugLog(p_pLogServerData,"Start GSWApp_ReceiveLine p_iBufferSize=%d",p_iBufferSize);

  *p_pszBuffer=0;
  if (!p_handle)
    {
      GSWLog(__FILE__, __LINE__, GSW_CRITICAL,p_pLogServerData,"GSWApp_ReceiveLine: no Handle !");
    }
  else
    {
      AppConnectSocketHandle handle=(AppConnectSocketHandle)p_handle;
      if (!handle->pFileRead)
        {
          GSWLog(__FILE__, __LINE__, GSW_CRITICAL,p_pLogServerData,"GSWApp_ReceiveLine: no read file handle !");
        }
      else
        {
          char* pszLine=fgets(p_pszBuffer,p_iBufferSize,handle->pFileRead);
          if (pszLine)
            {
              iRetValue=DeleteTrailingCRNL(p_pszBuffer);
            }
          else
            *p_pszBuffer=0;
        };
    };
  
  GSWDebugLog(p_pLogServerData,"GSWApp_ReceiveLine line=[%s]",p_pszBuffer);
  GSWDebugLog(p_pLogServerData,"Stop GSWApp_ReceiveLine");

  return iRetValue;
};

//--------------------------------------------------------------------
int GSWApp_ReceiveBlock(AppConnectHandle p_handle,
                        char* p_pszBuffer,
                        int p_iBufferSize,
                        void* p_pLogServerData) 
{
  int iRetValue=-1;

  GSWDebugLog(p_pLogServerData,
              "Start GSWApp_ReceiveBlock of in %d bytes buffer",
              p_iBufferSize);

  if (!p_handle)
    {
      GSWLog(__FILE__, __LINE__, GSW_CRITICAL,p_pLogServerData,"GSWApp_ReceiveBlock: no Handle !");
    }
  else
    {
      AppConnectSocketHandle handle=(AppConnectSocketHandle)p_handle;
      if (!handle->pFileRead)
        {
          GSWLog(__FILE__, __LINE__, GSW_CRITICAL,p_pLogServerData,"GSWApp_ReceiveBlock: no read file handle !");
        }
      else
        {
          iRetValue=fread(p_pszBuffer,sizeof(char),p_iBufferSize,handle->pFileRead); 
        };
    };

  GSWDebugLog(p_pLogServerData,
              "Stop GSWApp_ReceiveBlock (received %d bytes)",
              iRetValue);

  return iRetValue;
};

