/*

  Copyright 2009 Nathan Phillip Brink, Ethan Zonca, Matthew Orlando

  This file is a part of DistRen.

  DistRen is free software: you can redistribute it and/or modify

  it under the terms of the GNU Affero General Public License as published by

  the Free Software Foundation, either version 3 of the License, or

  (at your option) any later version.

  DistRen 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 Affero General Public License for more details.

  You should have received a copy of the GNU Affero General Public License

  along with DistRen.  If not, see <http://www.gnu.org/licenses/>.

*/

#include "slavefuncs.h"

#include "common/asprintf.h"

#include "common/options.h"

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/stat.h>

#include <unistd.h>

int main(int argc, char *argv[])

{

  char *datadir;

  char *server;

  char *username;

  char *hostname;

  cfg_opt_t myopts[] = {

    CFG_SIMPLE_STR("username", &username),

    CFG_SIMPLE_STR("datadir", &datadir),

    CFG_SIMPLE_STR("server", &server),

    CFG_SIMPLE_STR("hostname", &hostname),

    CFG_END()

  };

  cfg_t * my_cfg;

  struct options_common *commonopts;

  // struct distrenjob *myjob; /* Structure to hold data gathered from the XML file */

  // struct remoteio *comm_slave;

  /**

     initializations

  */

  datadir = NULL;

  server = NULL;

  username = NULL;

  char curopt;

  while(((char)-1) != (curopt = getopt(argc, argv, "u:th")))

     {

       if(curopt == ':')

         {

           fprintf(stderr, "-%c: is missing an argument\n", optopt);

           return 1;

         }

       else if(curopt == '?')

         {

           fprintf(stderr, "-%c: invalid option specified\n", optopt);

           return 1;

         }

       else if(curopt == 'h')

         {

           fprintf(stderr, "Usage: distrenslave [option] \nStarts a distren slave\n\t-u\tset username (run after fresh install)\n\t-t\tEnter test mode\n\t-h\tshow this help\n");

           return 2;

         }

       else if(curopt == 't')

         {

           slaveTest();

           return 0;

         }

       else if(curopt == 'u')

         username = strdup(optarg);

         fprintf(stderr, "Putting username \"%s\" in distrenslave.conf\n", username);

         conf_replace("distrenslave.conf", "!username", username);

         fprintf(stderr, "Please invoke distrenslave with no arguments to run with the username you just set\n");

         return 0;

     }

  /* Get conf data */

  options_init(argc, argv, &my_cfg, myopts, "slave", &commonopts);

  /* Notifies the user if there no username in .conf */

  if(checkUsername(username))

    return 1;

  /*

  fprintf(stderr, "Connecting to server...\n");

  if(remoteio_open(&comm_slave, commonopts->remoteio, server))

    {

      fprintf(stderr, "Error connecting to server; exiting\n");

      return 1;

    }

*/

  // Variables needed for main loop

  int jobnum = 0;

  int framenum = 0;

  int slavekey = atoi(username); // @TODO: Make this more friendly

  char *urltoTar;      /* Full URL to the server-side location of job#.tgz */

  char *pathtoTar;     /* Full path to the location of the job#.tgz */

  char *urltoOutput;   /* Full URL where output is posted */

  char *pathtoOutput;  /* Full path to the output (rendered) file */

  char *pathtoJobfile; /* Full path to the job's main file */

  char *outputExt = "jpg";     /* Output Extension (e.g., JPG) */

  int haveWork = 0;

  int quit = 0;

  // Main loop

  while(!quit)

    {

    // request work

    fprintf(stderr,"Requesting work...\n");

    haveWork = _web_getwork(slavekey, password, &jobnum, &framenum);

    /* If we got a frame */

    if(haveWork)

      {

        fprintf(stderr,"Got work from server...\n");

        /* @TODO: Add remotio hooks */

        // jobnum = remoteio_read(jobnum); /* Set jobnum from remoteio (we could use info from struct, but we need this info to download the xmlfile */

        // framenum = remoteio_read(jobnum); /* Set framenum from remoteio */

        // outputExt = remotio)read(outputExt); /* Set output extension from remotio */

        fprintf(stderr, "Preparing to render frame %d in job %d\n", framenum, jobnum);

        prepareJobPaths(jobnum, framenum, outputExt, datadir, &urltoTar, &pathtoTar, &pathtoJobfile, &urltoOutput, &pathtoOutput);

        free(outputExt);

        if(downloadTar(urltoTar, pathtoTar))

          return 1;

        unpackJob(pathtoTar, jobnum);

        /* Execute blender */

        if(exec_blender(pathtoJobfile, pathtoOutput, framenum))

          {

            fprintf(stderr,"Error running Blender. Check your installation and/or your PATH.\n");

            return 1;

          }

        free(pathtoJobfile);

        /* Post-execution */

        fprintf(stderr, "Finished frame %d in job %d, uploading...\n", framenum, jobnum);

        uploadOutput(pathtoOutput, urltoOutput, jobnum, framenum, slavekey); // @TODO: Handle return value

        free(urltoOutput);

        free(pathtoOutput);

        // Tell the server that rendering and upload are complete

	_web_finishframe(slavekey, password, jobnum, framenum);

      }

    else

      fprintf(stderr,"Nothing to do. Idling...\n");

    // @TODO: If the server says that every frame for the last jobnum is finished, OR if the data is getting old

    if(1 == 0)

      {

        // Note: individual frames are already deleted after uploading,

        // except for ones that couldn't be uploaded

        delete_jobdata(jobnum, datadir);

      }

    sleep(5); // Poll 5 seconds. @TODO: Remove all polling

  }

  fprintf(stderr,"Goodbye!\n");

  return 0;

}

/*

  Copyright 2009 Nathan Phillip Brink, Ethan Zonca, Matthew Orlando

  This file is a part of DistRen.

  DistRen is free software: you can redistribute it and/or modify

  it under the terms of the GNU Affero General Public License as published by

  the Free Software Foundation, either version 3 of the License, or

  (at your option) any later version.

  DistRen 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 Affero General Public License for more details.

  You should have received a copy of the GNU Affero General Public License

  along with DistRen.  If not, see <http://www.gnu.org/licenses/>.

*/

#include "distrenjob.h"

#include "slavefuncs.h"

#include "common/asprintf.h"

#include "common/execio.h"

#include "common/protocol.h"

#include "common/remoteio.h"

#include <curl/curl.h>

#include <curl/easy.h>

#include <curl/types.h>

#include <archive.h>

#include <archive_entry.h>

#include <stdio.h>

#include <string.h>

#include <unistd.h>

#include <stdlib.h>

#include <sys/stat.h>

#include <fcntl.h>

/**

   Sends the server a single request (see protocol.h)

*/

int sendSignal(struct remoteio *rem, char signal)

{

  size_t written;

  size_t towrite;

  char *ssignal;

  _distren_asprintf(&ssignal, "%c", signal);

  towrite = strlen(ssignal);

  while( towrite

	 && !remoteio_write(rem, ssignal, towrite, &written))

    {

      fprintf(stderr, "Sending request...\n");

      towrite -= written;

    }

  if(written)

    return 0;

  /**

     if remoteio_write returned 1, the connection

     is probably dead or there was a real error

   */

  return 1;

}

/**

   Sends the server an extended signal (request + data)

*/

int sendExtSignal(struct remoteio *rem, char signal, char *data){

  size_t written;

  size_t towrite;

  char *ssignal;

  _distren_asprintf(&ssignal, "%c%s", signal, data); // Just append the data FIXME: We should do this differently

  towrite = strlen(ssignal);

  while( towrite

          && !remoteio_write(rem, ssignal, towrite, &written))

     {

       fprintf(stderr, "Sending request...\n");

       towrite -= written;

     }

   if(written)

     return 0;

   /**

      if remoteio_write returned 1, the connection

      is probably dead or there was a real error

    */

   return 1;

}

/**

   Grabs the xml DOM node reached by an XPath.

   @param path an XPath that lead to DOM node

   @return the first node associated with the path or NULL if there is no match

 */

xmlNodePtr xml_quickxpath(xmlXPathContextPtr xpathctxt, xmlChar *path)

{

  xmlNodePtr toreturn;

  xmlXPathObjectPtr xmlxpathobjptr;

  xmlxpathobjptr = xmlXPathEval(path, xpathctxt);

  if(!xmlxpathobjptr

     || !xmlxpathobjptr->nodesetval->nodeNr)

    {

      fprintf(stderr, "XPath resolution failed for ``%s'' in ``%s'' (``%s'')\n", path, xpathctxt->doc->name, xpathctxt->doc->URL);

      return (xmlNodePtr)NULL;

    }

  toreturn = *(xmlxpathobjptr->nodesetval->nodeTab);

  xmlXPathFreeObject(xmlxpathobjptr);

  return toreturn;

}

/** Stub for deleting job data from the disk. @TODO: unstubify me! */

int delete_jobdata(int jobnum, char *datadir)

{

  char *jobpath;

  _distren_asprintf(&jobpath, "%s/%d", datadir, jobnum);

  // rmdir(jobpath);

  fprintf(stderr, "Please manually remove %s. Automatic removal is currently not implemented.\n", jobpath);

  return 0;

}

/** Function referenced by curlget() to write data to disk. */

size_t curl_writetodisk(void *ptr, size_t size, size_t nmemb, FILE *stream)

 {

    return fwrite(ptr, size, nmemb, stream);

  }

/** Helper function for cURL's progress display */

int curl_progress( char *Bar,double t,double d,double ultotal,double ulnow)

{

fprintf(stderr,"Downloading: %f%% complete\r",d/t*100);

return 0;

}

/** Retrieves a URL with cURL and saves it to disk */

int curlget(char *url, char *out){

  fprintf(stderr,"Preparing to download %s",url);

  double *Bar; // Stores cURL progress display info

  CURL *curl;

  CURLcode res;

  FILE *outfile;

  curl = curl_easy_init();

  if(curl) {

	outfile = fopen(out, "w"); // Open where we're writing to

  curl_easy_setopt(curl, CURLOPT_URL, url);

  curl_easy_setopt(curl, CURLOPT_WRITEDATA, outfile);

  curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_writetodisk); // this MUST be set for win32 compat.

  curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0);

  curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, curl_progress);

  curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, &Bar);

  res = curl_easy_perform(curl);

  curl_easy_cleanup(curl);

  }

  fprintf(stderr,"\n"); // Clears out he progressbar's carriage return

  return res; // 0 is OK, 1 is 404 or other error

}

/** Posts a file to a url with cUrl */

int curlpost(char *filename, char *url, int jobnum, int framenum, int slavekey){

  char *targetname = "uploadedfile"; // Name of the target in the php file on the server (Don't change me unless you have different PHP code)

  CURL *curl;

  CURLcode res;

  struct curl_httppost *formpost=NULL;

  struct curl_httppost *lastptr=NULL;

  struct curl_slist *headerlist=NULL;

  static const char buf[] = "Expect:";

  curl_global_init(CURL_GLOBAL_ALL);

  /* jobnum field... */

   curl_formadd(&formpost,

                &lastptr,

                CURLFORM_COPYNAME, "jobnum",

                CURLFORM_COPYCONTENTS, jobnum, CURLFORM_END);

  /* framenum field... */

  curl_formadd(&formpost,

               &lastptr,

               CURLFORM_COPYNAME, "framenum",

               CURLFORM_COPYCONTENTS, framenum, CURLFORM_END);

  /* slavekey field... */

  curl_formadd(&formpost,

               &lastptr,

               CURLFORM_COPYNAME, "slavekey",

               CURLFORM_COPYCONTENTS, slavekey, CURLFORM_END);

  /* upload field... */

  curl_formadd(&formpost,

               &lastptr,

               CURLFORM_COPYNAME, targetname,

               CURLFORM_FILE, filename,

               CURLFORM_END);

  /* filename field... */

  curl_formadd(&formpost,

               &lastptr,

               CURLFORM_COPYNAME, "filename",

               CURLFORM_COPYCONTENTS, filename,

               CURLFORM_END);

  /* submit field, not usually needed, just in case... */

  curl_formadd(&formpost,

               &lastptr,

               CURLFORM_COPYNAME, "submit",

               CURLFORM_COPYCONTENTS, "send",

               CURLFORM_END);

  curl = curl_easy_init();

  headerlist = curl_slist_append(headerlist, buf);

  if(curl) {

    /* Setting the URL to get the post, and the contents of the post */

    curl_easy_setopt(curl, CURLOPT_URL, url);

    curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);

    res = curl_easy_perform(curl);

    curl_easy_cleanup(curl);

    /* cleanup the formpost junk */

    curl_formfree(formpost);

    curl_slist_free_all (headerlist);

  }

  return res;

}

/** Logs the user into the server after ensuring that keys exist */

int login_user(char *username)

{

  // @TODO: Put some telnet-style auth code here unless this is obselete

  return 1; // success

}

/** Replaces wordtoreplace with replacewith in conffile (relative to SYSCONFDIR) */

int conf_replace(char *conffile, char *wordtoreplace, char *replacewith){

  int maxlinelen = 120;

  char *fileOrig;

  char *fileRepl;

  _distren_asprintf(&fileOrig, "%s/%s", SYSCONFDIR, conffile);

  _distren_asprintf(&fileRepl, "%s%s.edited", SYSCONFDIR, conffile);

  char buffer[maxlinelen+2];

  char *buff_ptr, *find_ptr;

  FILE *fp1, *fp2;

  size_t find_len = strlen(wordtoreplace);

  fp1 = fopen(fileOrig,"r");

  fp2 = fopen(fileRepl,"w");

  if (fp1 ==NULL){

    fprintf(stderr, "%s doesn't exist\n",fileOrig);

    return 0;

  }

  else if(fp2 ==NULL){

    fprintf(stderr, "Can't write a file to disk! Check permissions.\n");

    return 0;

  }

  else{

    while(fgets(buffer,maxlinelen+2,fp1))

      {

        buff_ptr = buffer;

        while ((find_ptr = strstr(buff_ptr,wordtoreplace)))

        {

           while(buff_ptr < find_ptr)

             fputc((int)*buff_ptr++,fp2);

           fputs(replacewith,fp2);

           buff_ptr += find_len;

         }

         fputs(buff_ptr,fp2);

      }

    rename(fileRepl, fileOrig);

  }

  fclose(fp2);

  fclose(fp1);

  fprintf(stderr,"Wrote conf file...\n");

return 1; // Success

}

/* Executors */

/** Executor function for Blender operations */

int exec_blender(char *input, char *output, int frame)

{

  fprintf(stderr,"Preparing to execute...\n");

  int ret;

  char *frame_str;

  char *command = "blender"; // @TODO: We currently expect this to be in PATH

  char *cmd[] = { command, "-b", "-o", output, input, "-f", frame_str, (char *)NULL }; // arguments for blender

  char buf[10];

  struct execio *testrem;

  size_t readlen;

  _distren_asprintf(&frame_str, "%i", frame);

  fprintf(stderr,"Executing: %s\n", frame_str);

  ret = execio_open(&testrem, command, cmd);

  buf[9] = '\0';

  while(!execio_read(testrem, buf, 9, &readlen))

    {

      if(readlen > 9) {

        fprintf(stderr, "Something is terribly wrong!\n");

       }

       buf[readlen] = '\0';

       fprintf(stderr, "read \"%s\"\n", buf);

    }

  execio_close(testrem);

  return ret;

}

void xmlinit()

{

  xmlInitParser();

  xmlXPathInit();

}

void xmlcleanup()

{

  xmlCleanupParser();

}

/** Creates directories recursively */

int distren_mkdir_recurse(char *dirname)

{

  size_t counter;

  char *nextdir;

  nextdir = strdup(dirname);

  for(counter = 0; nextdir[counter]; counter ++)

    {

      /** @TODO OS-portabalize the path-separators */

      if(nextdir[counter] == '/')

        {

          nextdir[counter] = '\0';

          mkdir(nextdir, S_IRWXU | S_IRGRP | S_IROTH);

          nextdir[counter] = '/';

        }

    }

  return 0;

}

/**

 @TODO: Use for constructing path to job data locally and/or on data.distren.org

 */

int job_build_path(char *filename, unsigned int jobnum)

{

  return 0;

}

int downloadTar(char *url, char *destinationPath){

  // Prepare to download the job tar if it isn't  present

  struct stat buffer;

  int fstatus = stat(destinationPath, &buffer);

  if(fstatus == -1)

    {

      // Download the Tar

      if( curlget(url, destinationPath) == 0){

        fprintf(stderr, "Job data retrieved successfully\n");

        // free(url); @FIXME: causes doublefree! Curl must free the url?

        return 0;

      }

      else {

        fprintf(stderr, "Downloading job data from %s failed. Check your network connection.\n",url);

        free(url);

        return 1; // Eventually make a retry loop

      }

    }

  else{

    fprintf(stderr, "Tar already exists! Download cancelled.\n");

    return 2;

  }

}

int uploadOutput(char *pathtoOutput, char *urltoOutput, int jobnum, int framenum, int slavekey){

  if( !curlpost(pathtoOutput, urltoOutput, jobnum, framenum, slavekey)) // Uploads output

    {

      fprintf(stderr,"Upload successful, removing old output...\n");

      remove(pathtoOutput); // Delete the file after its uploaded

      return 0;

    }

  else

    {

      fprintf(stderr,"Upload failed. Check your network connection. Retrying upload...\n");

      int tries=1;

      while(tries<=10 && curlpost(pathtoOutput, urltoOutput, jobnum, framenum, slavekey))

        {

          fprintf(stderr, "Upload failed. Trying again in 10 seconds... (attempt %d of 10)\n", tries);

          tries++;

          sleep(10);

        }

      return 1; // Upload failed after multiple tries

      // @FUTURE: Keep track of files that we were unable to upload, and upload them later

    }

}

int unpackJob(char *pathtoTar, int jobnum){

  int ret;

  int buffsize = 8192;

  char *buff = "";

  size_t size;

  struct archive_entry *ae = archive_entry_new();

  struct archive *a = archive_read_new();

  archive_read_support_compression_all(a);

  archive_read_support_format_raw(a);

  ret = archive_read_open_filename(a, pathtoTar, 16384);

  if (ret != ARCHIVE_OK) {

    return 1;

  }

  ret = archive_read_next_header(a, &ae);

  if (ret != ARCHIVE_OK) {

    return 1;

  }

   for (;;) {

    size = archive_read_data(a, buff, buffsize);

    if (size < 0) {

      return 1;

    }

    if (size == 0)

      break;

    write(1, buff, size);

  }

  archive_read_finish(a);

  archive_entry_free(ae);

  return 0;

/*

  char *tarcmd;        // Command to run for tar. Migrate to libtar sometime

  char *outdir;        // Output Directory for tar

  _distren_asprintf(&outdir, "/tmp/distren/job%d", jobnum);

  mkdir("/tmp/distren", 0750); // @FIXME: Change to tmpdir once it exists

  mkdir(outdir, 0750);

  _distren_asprintf(&tarcmd, "tar -xvf \"%s\" -C \"%s\"", pathtoTar, outdir); // @FIXME:Use a lib here!

  system(tarcmd);

  free(tarcmd);

  free(pathtoTar);

  free(outdir);

  return 0;

  */

}

void prepareJobPaths(int jobnum, int framenum, char *outputExt, char *datadir, char **urltoTar,char **pathtoTar,char **pathtoJobfile,char **urltoOutput,char **pathtoOutput){

  // Variable Preparation

  char *jobdatapath;

   _distren_asprintf(&jobdatapath, "job%d", jobnum);

   _distren_asprintf(urltoTar, "http://data.distren.org/job%d/job%d.tar.gz", jobnum); // Prepares URL to download from

   _distren_asprintf(pathtoTar, "%s/stor/jobdata/job%d.tar.gz", datadir, jobnum); // Prepares destination to save to

   _distren_asprintf(pathtoJobfile, "%s/%s/job.blend", datadir, jobdatapath ); // Prepares the path to the jobfile

   _distren_asprintf(urltoOutput, "http://distren.org/slaveUpload.php"); // Prepares the URL where output is posted

   _distren_asprintf(pathtoOutput, "%s/job%d/output/job%d-frame%d.%s", datadir, jobnum, jobnum, framenum, outputExt );

   free(jobdatapath);

}

     fprintf(stderr, "\nPlease ensure that your username is present in distrenslave.conf\n");

   }

   else

     if( username != NULL || strcmp(username, "!username") != 0 )

       {

         // Log in the user

         if(login_user(username) == 1){

           fprintf(stderr, "You should now be logged into distren.\n");

           return 0;

         }

         else

           {

             fprintf(stderr, "Login failed, please check your username. If you have not registered, please do so on the DistRen website.\n");

             return 1;

           }

       }

     else

       {

         fprintf(stderr, "Please check your distrenslave.conf, it appears to be incorrectly formatted.\n");

         return 1;

       }

}

void slaveTest(){

  int command;

  int test = 1;

  int jobnum = 0;

  int framenum = 0;

  int slavekey = 0;

  fprintf(stderr,"Hello!\n");

  char tmpString1[100] = "";

  char tmpString2[100] = "";

  char *uploadURL = "http://distren.org/slaveUpload.php";

  while(test == 1)

   {

     fprintf(stderr, "Welcome to DistRenSlave Alpha Interactive Test Mode\n\n");

     fprintf(stderr, "\t1 \tTest posting (uploading) data\n");

     fprintf(stderr, "\t2 \tTest getting frame from server\n");

     fprintf(stderr, "\t3 \tTest data downloading\n");

     fprintf(stderr, "\t4 \tTest archive decompression\n");

     fprintf(stderr, "\t5 \tQuit\n");

     scanf("%d", &command);

     switch(command)

     {

     case 1:

       fprintf(stderr,"Path to output file to upload: ");

       scanf("%99s", tmpString1);

       fprintf(stderr,"Framenum that is being uploaded: ");

       scanf("%d", &framenum);

       fprintf(stderr,"Jobnum that frame belongs to: ");

       scanf("%d", &jobnum);

       fprintf(stderr,"Slavekey that rendered this output: ");

       scanf("%d", &slavekey);

       uploadOutput(tmpString1, uploadURL, jobnum, framenum, slavekey);

       break;

     case 2:

       fprintf(stderr,"Remotio not implemented yet!\n");

       break;

     case 3:

       fprintf(stderr,"URL to file: ");

       scanf("%s", tmpString1);

       fprintf(stderr,"Local save path (including filename): ");

       scanf("%s", tmpString2);

       if(downloadTar(tmpString1, tmpString2))

         fprintf(stderr,"Error downloading!\n");

       else

         fprintf(stderr,"Success!\n");

       break;

     case 4:

       fprintf(stderr,"Jobnum to decompress: ");

       scanf("%d", &jobnum);

       fprintf(stderr,"Path to compressed data: ");

       scanf("%s", tmpString2);

       unpackJob(tmpString1, jobnum);

       break;

     case 5:

       test = 0;

       break;

     default:

       fprintf(stderr, "Invalid input, please try again.\n");

       break;

     }

   }

}

/* simpleSlave functions */

/** Memory struct for curl */

struct _web_memorystruct {

  char *memory;

  size_t size;

};

static void *_web_myrealloc(void *ptr, size_t size);

static void *_web_myrealloc(void *ptr, size_t size)

{

  /* There might be a realloc() out there that doesn't like reallocing

     NULL pointers, so we take care of it here */

  if(ptr)

    return realloc(ptr, size);

  else

    return malloc(size);

}

static size_t _web_writememorycallback(void *ptr, size_t size, size_t nmemb, void *data)

{

  size_t realsize = size * nmemb;

  struct _web_memorystruct *mem = (struct _web_memorystruct *)data;

  mem->memory = _web_myrealloc(mem->memory, mem->size + realsize + 1);

  if (mem->memory) {

    memcpy(&(mem->memory[mem->size]), ptr, realsize);

    mem->size += realsize;

    mem->memory[mem->size] = 0;

  }

  return realsize;

}

struct _web_memorystruct _web_getrequest(char *url){

  // fprintf(stderr,"Preparing to get request at %s",url);

  CURL *curl;

  CURLcode res;

  struct _web_memorystruct chunk;

  chunk.memory=NULL; /* we expect realloc(NULL, size) to work */

  chunk.size = 0;    /* no data at this point */

  curl = curl_easy_init();

  if(curl) {

    curl_easy_setopt(curl, CURLOPT_URL, url);

    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, _web_writememorycallback);

    curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&chunk);

    curl_easy_setopt(curl, CURLOPT_USERAGENT, "libcurl-agent/1.0");

    res = curl_easy_perform(curl);

    curl_easy_cleanup(curl);

  }

  /* we're done with libcurl, so clean it up */

  curl_global_cleanup();

  return chunk; // 0 is OK, 1 is 404 or other error

}

void _web_finishframe(int slavekey, char *slavepass, int jobnum, int framenum){

  char *url;

  _distren_asprintf(&url,"http://dev.distren.org/slave/act.php?mode=finishframe&slavekey=%d&slavepass=%s&jobnum=%d&framenum=%d", slavekey, slavepass, jobnum, framenum);

  struct _web_memorystruct data = _web_getrequest(url);

  free(url);

  fprintf(stderr,"Got data: %s\n", data.memory);

  if(data.memory)

    free(data.memory);

}

void _web_startframe(int slavekey, char *slavepass, int jobnum, int framenum){

}

int _web_getwork(int slavekey, char *slavepass, int *jobnum, int *framenum){

  char *url;

  _distren_asprintf(&url,"http://dev.distren.org/slave/act.php?mode=getwork&slavekey=%d&slavepass=%s", slavekey, slavepass);

  struct _web_memorystruct data = _web_getrequest(url);

  free(url);

  //fprintf(stderr,"Got data for getwork: %s!\n", data.memory);

  if(!strcmp(data.memory, "ERROR_BADKEY")){

    fprintf(stderr,"*** Slave %d does not exist!\n",slavekey);

    free(data.memory);

    return 0;

  }

  else{

    *jobnum = atoi(data.memory);

    *framenum = atoi(strchr(data.memory, ',') + 1);

    free(data.memory);

    return 1;

  }

}

void _web_setrenderpower(int slavekey, char *slavepass, int jobnum, int framenum){

}