/*

  Copyright 2010 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>

#include <time.h>

#define DEBUG 0

/**

   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 */

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

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

  double *Bar; // Stores cURL progress display info

  CURL *curl;

  CURLcode res;

  FILE *outfile;

  res = CURLE_FAILED_INIT;

  curl = curl_easy_init();

  if(curl)

    {

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

    if(outfile == NULL)

      return 2; // Output dir doesn't exist

    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_callback)&curl_progress);

    curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, &Bar);

    res = curl_easy_perform(curl);

    curl_easy_cleanup(curl);

    fclose(outfile);

  }

  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 */

CURLcode 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:";

  char *sjobnum;

  char *sframenum;

  char *sslavekey;

  if(DEBUG)

    fprintf(stderr,"Uploading to %s\n", url);

  _distren_asprintf(&sjobnum,"%d",jobnum);

  _distren_asprintf(&sframenum,"%d",framenum);

  _distren_asprintf(&sslavekey,"%d",slavekey);

  curl_global_init(CURL_GLOBAL_ALL);

  /* jobnum field... */

   curl_formadd(&formpost,

                &lastptr,

                CURLFORM_COPYNAME, "jobnum",

                CURLFORM_COPYCONTENTS, sjobnum, CURLFORM_END);

  /* framenum field... */

  curl_formadd(&formpost,

               &lastptr,

               CURLFORM_COPYNAME, "framenum",

               CURLFORM_COPYCONTENTS, sframenum, CURLFORM_END);

  /* slavekey field... */

  curl_formadd(&formpost,

               &lastptr,

               CURLFORM_COPYNAME, "slavekey",

               CURLFORM_COPYCONTENTS, sslavekey, 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);

  res = CURLE_FAILED_INIT;

  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);

    free(sjobnum);

    free(sframenum);

    free(sslavekey);

    }

  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)

{

  int ret;

  char *frame_str;

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

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

  char *cmd[] = { command, "-b", input, "-o", output, "-f", frame_str, "-t", "0", (char *)NULL }; // arguments for blender

  if(DEBUG)

    fprintf(stderr,"Preparing to execute command: %s -b %s -o %s -f %s\n", command, input, output, frame_str);

  char buf[20];

  struct execio *testrem;

  size_t readlen;

  if(DEBUG)

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

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

  if(ret)

    {

      fprintf(stderr, "Error running blender\n");

      return 1;

    }

  buf[19] = '\0';

  while(!execio_read(testrem, buf, 19, &readlen))

    {

       buf[readlen] = '\0';

       if(DEBUG)

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

    }

  execio_close(testrem);

  free(frame_str);

  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

      int ret = curlget(url, destinationPath);

      if(ret == 0){

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

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

        return 0;

      }

      else if(ret == 1){

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

        free(url);

        return 1; // Eventually make a retry loop

      }

    }

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

  return 2;

}

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

  //fprintf(stderr,"Uploading output %s to url %s for job %d and frame %d for slavekey %d", pathtoOutput, urltoOutput, jobnum, framenum, slavekey);

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

    {

      if(DEBUG)

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

      else

        fprintf(stderr,"Upload completed\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

    }

}

/**

   Extracts archive to the specified directory, creating this directory

   if necessary (but this directory will not be recursively created).

   @param outdir output directory

   @param pathtoTar filename of the archive to extract

 */

int unpackJob(char *outdir, char *pathtoTar)

{

  int ret;

  struct archive *a;

  struct archive_entry *ae;

  int astatus;

  /* ignore return because directory may exist already */

  mkdir(outdir, 0700);

  ret = chdir(outdir);

  if(ret == -1)

    {

      perror("chdir");

      return 1;

    }

  a = archive_read_new();

  ae = archive_entry_new();

  archive_read_support_compression_all(a);

  archive_read_support_format_raw(a);

  astatus = archive_read_open_filename(a, pathtoTar, 8192);

  if (astatus != ARCHIVE_OK)

    {

      fprintf(stderr, "error opening archive\n");

      return 1;

    }

  for(astatus = ARCHIVE_OK;

      astatus == ARCHIVE_OK

	|| astatus == ARCHIVE_WARN;

      )

    {

      astatus = archive_read_next_header2(a, ae);

      if(astatus == ARCHIVE_WARN)

	fprintf(stderr, "Encountered nonfatal read error somehow\n");

      if(astatus == ARCHIVE_OK

	 || astatus == ARCHIVE_WARN)

	astatus = archive_read_extract(a, ae,

				       ARCHIVE_EXTRACT_NO_OVERWRITE

				       | ARCHIVE_EXTRACT_SECURE_SYMLINKS

				       | ARCHIVE_EXTRACT_SECURE_NODOTDOT);

    }

  archive_entry_free(ae);

  archive_read_finish(a);

  if(astatus != ARCHIVE_EOF)

    {

      fprintf(stderr, "Error reading archive\n");

      return 1;

    }

  return 0;

}

void prepareJobPaths(int jobnum, int framenum, char *outputExt, char *datadir, char **urltoTar,char **pathtoTar,char **pathtoTardir,char **pathtoJob, char **pathtoJobfile, char **urltoJobfile, char **urltoOutput,char **pathtoOutput, char **pathtoRenderOutput, char **pathtoOutdir)

{

  // Variable Preparation

  char *jobdatapath;

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

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

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

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

   _distren_asprintf(pathtoTardir, "%s/%s/", datadir, jobdatapath); // Prepares destination to save to

   _distren_asprintf(pathtoJob, "%s/%s/", datadir, jobdatapath);

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

   _distren_asprintf(urltoOutput, "http://dev.distren.org/slaveUpload.php?jobkey=%d&framekey=%d",jobnum,framenum); // Prepares the URL where output is posted

   _distren_asprintf(pathtoRenderOutput, "%s/%s/output/job%d-frame#.%s", datadir, jobdatapath, jobnum, outputExt ); // Note: the # is for blender to put in framenum in output file

   _distren_asprintf(pathtoOutput, "%s/%s/output/job%d-frame%d.%s", datadir, jobdatapath, jobnum, framenum, outputExt ); // Note: the # is for blender to put in framenum in output file

   _distren_asprintf(pathtoOutdir, "%s/%s/output", datadir, jobdatapath);

   free(jobdatapath);

}

int checkUsername(char *username)

{

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

    {

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

     return 1;

   }

   else

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

       {

         // Log in the user

         if(login_user(username) == 1){

           // Logged in OK

           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(char *datadir)

{

  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(datadir, tmpString1);

       break;

     case 5:

       test = 0;

       break;

     default:

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

       break;

     }

   }

}

/*

int runBenchmark(int slavekey, char *datadir){

  // Execute blender

  if(exec_blender(pathtoJobfile, pathtoOutput, framenum))

    {

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

      _web_resetframe(slavekey, password, jobnum, framenum);  // Unassign the frame on the server so other slaves can render it

      return 1;

    }

  free(pathtoJobfile);

  struct stat buffer;

  int fstatus = stat(pathtoOutput, &buffer);

  if(fstatus == -1){

    fprintf(stderr,"*** Frame was not rendered correctly! Scene may not have camera, or your blender installation is not working.\n");

    _web_resetframe(slavekey, password, jobnum, framenum);  // Unassign the frame on the server so other slaves can render it

    return 1;

  }

}

*/

/* simpleSlave functions */

/** Memory struct for curl */

struct _web_memorystruct {

  char *memory;

  size_t size;

};

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

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);

}

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,"%s\n", data.memory);

  if(data.memory)

    free(data.memory);

}

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

  fprintf(stderr,"Resetting frame %d in job %d on server... ",framenum,jobnum);

  char *url;

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

  struct _web_memorystruct data = _web_getrequest(url);

  free(url);

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

  if(data.memory)

    free(data.memory);

}

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

  if(DEBUG)

    fprintf(stderr,"Marking frame %d started on server... ",framenum);

  char *url;

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

  struct _web_memorystruct data = _web_getrequest(url);

  free(url);

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

  if(data.memory)

    free(data.memory);

}

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);

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

    fprintf(stderr,"*** No work available on server! In other news, really weird things are happening. Check it out. You shouldn't be seeing this.\n");

    return 0;

  }

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

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

    free(data.memory);

    return 0;

  }

  // Compare to PACKAGE_VERSION

  else{

    char *tmp;

    char *serverversion;

    tmp = strtok (data.memory,",,");

    if(tmp != NULL){ // make sure work is available

      *jobnum = atoi(tmp);

      tmp = strtok (NULL, ",");

      if(tmp == NULL)

        return 0; // no work

      *framenum = atoi(tmp);

      tmp = strtok (NULL, ",");

      if(tmp == NULL)

        return 0; // no work

      serverversion = tmp;

      // @TODO: This should be called every time, not just on fail.

      if(strcmp(PACKAGE_VERSION,serverversion)){

        fprintf(stderr,"Your distren package is out of date! Please acquire a newer version. (%s local vs %s remote)\n", PACKAGE_VERSION, serverversion);

        return 0;

      }

      if(DEBUG)

        fprintf(stderr,"Software versions: %s local vs %s remote\n", PACKAGE_VERSION, serverversion);

      free(data.memory);

      return 1;

    }

    else

      return 0; // error

  }

}

void _web_setrenderpower(int slavekey, char *slavepass, int renderpower){

  fprintf(stderr,"Setting render power on server... ");

  char *url;

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

  struct _web_memorystruct data = _web_getrequest(url);

  free(url);

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

  if(data.memory)

    free(data.memory);

}

int slaveBenchmark(char *datadir, int *benchmarkTime, int *renderPower){

  int ret;

  int frameToRender = 1;

  char *frame_str;

  _distren_asprintf(&frame_str, "%d", frameToRender); // Render frame 1

  char *output;

  _distren_asprintf(&output, "%s/benchmark#.jpg", datadir); // Where to save benchmark output

  char *realOutput;

  _distren_asprintf(&realOutput, "%s/benchmark%d.jpg", datadir, frameToRender); // Where to save benchmark output

  char *input;

  _distren_asprintf(&input, "%s/benchmark.blend", datadir); // Input file

  fprintf(stderr,"Downloading benchmark data...\n");

  curlget("http://data.distren.org/benchmark.blend", input); // Download to input file location

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

  char *cmd[] = { command, "-b", input, "-o", output, "-f", frame_str, "-t", "0", (char *)NULL }; // arguments for blender

  // fprintf(stderr,"Preparing to execute command: %s -b %s -o %s -f %s\n", command, input, output, frame_str);

  fprintf(stderr,"Running benchmark...\n");

  long startTime;

  long endTime;

  time(&startTime);

  char buf[20];

  struct execio *testrem;

  size_t readlen;

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

  if(ret)

    {

      fprintf(stderr, "Error executing blender\n");

      return 1;

    }

  buf[19] = '\0';

  while(!execio_read(testrem, buf, 19, &readlen))

    {

       buf[readlen] = '\0';

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

    }

  execio_close(testrem);

  time(&endTime);

  struct stat buffer;

  int ostatus = stat(realOutput, &buffer);

  if(ostatus == -1){

    ret = 1; // Return error if output wasn't generated

  }

  else

    remove(output);

  *benchmarkTime = abs(difftime(startTime,endTime));

  float tmp = *benchmarkTime;

  tmp = (1/tmp) * 50000;

  *renderPower = (int)tmp;

free(realOutput);

  free(frame_str);

  free(input);

  free(output);

  return ret;

}

/* Port of web functions for standard code