/*

  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/>.

*/

/* This file contains the code which both processes (renders) jobs as a slave, and the code which distributes frames to slaves after receiving them from the client portion of the codebase. */

 /* Just some notes -- Ethan Zonca

 * ++ Make data availible for other apps to parse

 * Server<==>Client Communication

 * Upload while rendering

 */

/* XML notes --

 *

 * First off, is XML in our build environment?

 * Next, what files are we going to have?:

 *  - XML file sent with (.blend/.pov/.lux(xml)/whatever) by distren telling the server what to do

 *  	+ Includes submitter name, filename, emailaddress, etc

 *  - XML file on server storing info on current and finished jobs

 *  - XML file sent by distren when submitting a render to the server

 *

 *  Overall, we could use XML to make our client/server communication load

 *  a lot lighter, especially if clients are sent customized xml files telling

 *  them what frame(s) to render... although that would be inefficient if rendering

 *  single frames. Maybe not tell it what frames to render in the xml file, the server

 *  can spit out that info.

 *

 *  Please edit my ramblings if you please,

 *  --ethanzonca

 *

 */

#include "execio.h"

#include "options.h"

#include "blendjob.h"

#include "protocol.h"

#include <confuse.h>

#include <stdio.h>

#include <stdlib.h>

#include <malloc.h>

#include <unistd.h> /* getopt */

#include <time.h>

/* ******************* Structs ************************ */

// Stores config info? editmycomment

struct distrend_config

{

  cfg_t *mycfg;

  struct options_common *options;

  struct distrend_listen **listens; /*< Null terminated array of structs */

};

/*

 frame[frame] Status Assignments:

  "NULL" - don't render me

  "0" - canceled

  "1" - unassigned

  "2" - assigned to slave

  "3" - completed by slave and uploaded

 Have a script crawl through each job in the arrays, priority-biased, and assign a frame to each slave.

 Then we will need some sort of watchdog to monitor slaves on the main server to check for stales. Maybe not worry about this for now.

*/

struct general_info {

	short int jobs_in_queue; //

	unsigned short int free_clients;

	unsigned short int rendering_clients;//

	unsigned short int total_finished_jobs; //

	unsigned int total_frames_rendered; //

} general_info;

/*

  internally defined funcs's prototypes

*/

void status_report_generator(struct blendjob **blendjobs_head);

void blendjob_remove(struct blendjob **head, struct blendjob *bj);

struct blendjob *blendjob_get(struct blendjob *head, jobnum_t jobnum);

/* Global Vars, try to cut down on these */

jobnum_t jobnum = 0; // The next job number to create in the queue

int hcfjob; // Highest consecutively finished job

int highest_jobnum; // The job number of the most recently created job, this is used when creating new jobs

/* ********************** Functions ************************* */

/* Functions to stubify */

/** Command interface for distren? */

int distrend_do(){

}

/** Something? */

void distrend_accept(){

}

/** Frees the action */

void distrend_action_free(){

}

/** Start listening */

void distrend_listen(){

}

/** Stop listening */

void distrend_unlisten(){

}

/** This is probably just a placeholder for remotio */

void remotio_send_to_client(){

	// I am futile!

}

/** Fill variables after crash / shutdown from XML dumps */

void start_data(){

	if(1 == 0){

		// retrieve total_finished_jobs and total_finished_frames from xml file

	}

	else{

		general_info.total_finished_jobs = 0;

		general_info.total_frames_rendered = 0;

	}

}

// **** Finish-Setter: Sets a frame to the "completed" status.

void finish_frame(struct blendjob *blendjob, int frame){

  blendjob->frameset[frame].status = 2;

  blendjob->frameset[frame].time_to_render = (clock() - blendjob[jobnum].frameset[frame].start_time); // Consider changing time-to-render to time-for-frame or something?

  general_info.total_frames_rendered++; // Increase total frames var for stats

}

// **** Queuer: Adds files to the queue

void queue(struct blendjob *blendjob, int type, char *name, char *submitter, char *email, int priority, int mode, int spp, struct frameset *frameset) {

	// Type: 1 = blender, add more types later

	// jobnum is the next available job number

	if(type == 1){

    blendjob->name = name;

    blendjob->submitter = submitter;

    blendjob->email = email;

    blendjob->priority = priority;

    blendjob->frameset = frameset;

  }

  else{

    // Throw error.

  }

jobnum++; // Advance the jobnumber for the next queued job

}

/**

  Status Report Generator:

  -figures out how much of the job is done, where jobnum corresponds to the job number

  -removes finished jobs

  @param blendjobs_head a pointer to a pointer because the head of the blendjobs linked list may need to be changed by blendjob_remove

*/

void status_report_generator(struct blendjob **blendjobs_head)

{

  struct blendjob *blendjob_ptr;

  unsigned short workers_working; /*< used to count the total number of workers working */

  unsigned int numjobs; /*< used to track number of jobs */

  blendjob_ptr = *blendjobs_head;

  workers_working = 0;

  numjobs = 0;

  while(blendjob_ptr)

    {

      if(blendjob_ptr->priority != 0)

	/* If the job is not done, scan it */

	{

	  unsigned int framecounter;  /*< to scan through frames */

	  unsigned long finished_frames; /*< variable that counts the completed frames */

	  unsigned int pending_frames; /*< variable that counts the assigned frames */

	  float percent_frames_finished;  /*< variable that stores the percent done of the blendjob */

	  unsigned int total_time;  /*< total time taken to render all the completed frames for a job */

	  framecounter = 0;

	  finished_frames = 0;

	  pending_frames = 0;

	  percent_frames_finished = 0;

	  total_time = 0;

	  while(framecounter < blendjob_ptr->total_frames)

	    /* scans through frames, based on their status it runs a statement(s) */

	    {

	      if(blendjob_ptr->frameset[framecounter].status == 2)

		/* If the frame is done */

		{

		  finished_frames ++;

		  total_time += blendjob_ptr->frameset[framecounter].time_to_render;

		}

	      if(blendjob_ptr->frameset[framecounter].status == 1)

		/* If the frame is assigned */

		{

		  pending_frames ++;

		  workers_working ++;

		}

	      framecounter ++;

	    } /* while(framecounter < blendjob_ptr->total_frames) */

	  // find the percent of completed frames

	  percent_frames_finished = (finished_frames / blendjob_ptr->total_frames) * 100; /*< @LordofWar: extraneous parentheses! */

	  /* updates values in the blendjob struct */

	  blendjob_ptr->completed_frames = finished_frames;

	  blendjob_ptr->assigned_frames = pending_frames;

	  blendjob_ptr->percent_done = percent_frames_finished;

	  blendjob_ptr->avg_render_time = (total_time / finished_frames); /*< extraneous parentheses! */

	  blendjob_ptr->time_remaining = (blendjob_ptr->avg_render_time * (blendjob_ptr->total_frames - finished_frames)); /*< extraneous parentheses! */

	  if(finished_frames == blendjob_ptr->total_frames)

	    /* If all frames are complete */

	    {

	      blendjob_ptr->priority = 0; /*< set priority to zero to indicate job is complete */

	      blendjob_remove(blendjobs_head, blendjob_ptr); /*< remove this job from the linkedlist */

	      general_info.total_finished_jobs++; /*< add one to the total finished jobs */

	    }

	  else if (finished_frames > blendjob_ptr->total_frames)

	    /* just in case ;-) */

	    {

	      fprintf(stderr, "%s:%d: finished_frames (%lu) > blendjob_ptr->total_frames (%d)",

		      __FILE__, __LINE__,

		      finished_frames,

		      blendjob_ptr->total_frames);

	      abort();

	    }

	}

      general_info.rendering_clients = workers_working; /*< should this be a +=? */

      blendjob_ptr = blendjob_ptr->next; /*< This is the essence of linked lists and iterating through them */

      numjobs ++;

    } /* while(blendjob_ptr) */

  general_info.jobs_in_queue = (highest_jobnum - general_info.total_finished_jobs); /*< extraneous parentheses! */

}

// **** Structure Builder: This function creates frame array based on the total number of frames to be rendered, which will then be parsed by function frame_farmer.

void frame_num_struct_builder(struct blendjob *job, unsigned int startframe, unsigned int numframes) {

  int jobnum_new = highest_jobnum + 1; /* global vars will someday leave us  */

  unsigned int counter;

	job->frameset = malloc(sizeof(struct frameset) * numframes);

	if(!job->frameset)

	  fprintf(stderr, "error allocating memory");

	job->total_frames = numframes; // sets the total number of frames in animation for status purposes

	job->jobnum = jobnum_new;

	for(counter = 0; counter < numframes; counter ++)

	  /* This builds the array, with the array starting at zero and the frameset.num starting at sframe */

	  job->frameset[counter].num = counter + startframe;

	highest_jobnum++; // After it has created the job, it adds one to the highest_jobnum interger

}

/**

  Frame Finder: matches your computer up with a lovely frame to render

  TODO: Major issue here, the client needs to know the frame number, AND the job number!

  Notice that this function starts by looking at the oldest job first

	TODO: Link this up with the main() function to check if there are frames available or not and provide jobnum/framenum to the client

  @return 0 success, other: error

*/

int frame_finder(struct blendjob *head, struct blendjob **job, struct frameset **frame)

{

  int your_frame;  // your_frame is an integer value that will be given to the client as the frame number to render

  int your_job;	   // you_job is an integer value that must ALSO be given to the client

  unsigned short int found;

  unsigned short int priority;

  struct blendjob *blendjob_ptr;

/*

  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/>.

*/

 /*

  * Registration on server. Needs attention. Prevent account spamming.

  * distrenslave -c username email@example.com

 */

#include "slavefuncs.h"

#include "blendjob.h"

#include "execio.h"

#include <stdio.h>

#include <string.h>

#include <unistd.h>

#include <stdlib.h> /*< malloc(), free() */

#include <sys/stat.h>

#include <fcntl.h>

/** Generates a SSH key with ssh-keygen */

int ssh_keygen(){

	// distren.id_rsa and distren.id_rsa.pub are now generated in SYSCONFDIR (etc)

	// Checks to see if the keys are already present.

	int status;

	struct stat buffer;

	status = stat(SYSCONFDIR "/distren.id_rsa", &buffer);

	if(status != -1){

		fprintf(stderr, "Please delete etc/distren.id_rsa and etc/distren.id_rsa.pub to register.\n");

		return 0;

	}

/* start execio code */

	char *command = "ssh-keygen"; // @TODO: append .exe if win32?

	int ret;

	char *cmd[] = { command, "-q", "-f", SYSCONFDIR "/distren.id_rsa", "-N", "", (char *)NULL }; // TODO: Give me the correct args!

	char buf[10];

	struct execio *testrem;

	size_t readlen;

	ret = execio_open(&testrem, command, cmd); // This path will be absolute for testing, should be relative to install on production

	buf[9] = '\0'; // null-terminating the array...

	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);

/* end execio code */

	// Supposedly execio returns 1 if it has bad args.

	if(ret == 1){

		fprintf(stderr, "Generating your key failed. Ensure that ssh-keygen is present!\n"); // Use different executor that searches the path? there is one...

		return 0;

	}

	else{

		fprintf(stderr,"We successfully generated your key! Yay!");

		return 1;

	}

return 0;

}

/** Registers the user on the DistRen server */

int register_user(char *username, char *email)

{

  /*

   * Logs into sandboxed user on zserver2 and registers a user. Should eventually generate a key on the server and return it to the user.

   * All created user accounts should be sandboxed accordingly, requiring a different skel, and the default shell to be rbash. Also,

   * a custom path defined in the .bash_profile of the skel is needed.

   */

  char buf[10];

  struct execio *testrem;

  char *execargv[] =

    {

      "ssh",

      "distren_setup@protofusion.org",

      "-i",

      SYSCONFDIR "/setup_rsa", // default distributed key, account can only create users.

      "-p",

      "23",

      "newuser",

      "-M",

      "-c",

      email,

      "-d",

      "/home/distren",

      "--gid",

      "541",

      username,

      (char *)NULL

    };

  size_t readlen;

  buf[9] = '\0'; // null-terminating the array...

  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);

  /* @TODO: Parse the output buffer or something to check when user creation fails due to duplicate users. This is pretty important. */

  // puts the person's username in the conf

  if(conf_replace(username) == 0){

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

	  return 0;

  }

  // generates keys for login, @TODO: pub key must somehow be sent to the server.

  if(ssh_keygen() == 0){

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

	  return 0;

  }

  return 1;

}

/** Logs the user into the server with a nice ssh session */

int login_user(char *username)

{

  char *userhost;

  char *userkey;

  char buf[10];

  struct execio *testrem;

  char *execargv[] =

    {

      "ssh",

      "-i",

      (char *)NULL, // Key created from registeruser()

      "-p",

      "23",

      (char *)NULL,// username and hostname

      "echo",

      "hello", // This should eventually open a non-terminating connection to the server for communication,

      (char *)NULL

    };

  size_t readlen;

  /*< @TODO remove being tied to protofusion.org for no reason  */

  userhost = malloc(strlen(username) + strlen("@protofusion.org") + 1);

  if(!userhost)

    return 43;

  strcpy(userhost, username);

  strcat(userhost, "@protofusion.org"); // Throws @protofusion.org after the username

  userkey = malloc(strlen(username) + strlen(".rsa") + 1);

  if(!userkey)

    {

      free(userhost);

      return 44;

    }

  strcpy(userkey, username);

  strcat(userkey,".rsa");

  fprintf(stderr, "Logging you in to %s using key %s\n", userhost, userkey);

  if(fopen(userkey, "r") == NULL){

	  fprintf(stderr,"Your key, %s, has not been found! Re-register or somehow regenerate your key! We need a way to regenerate keys coded in, but we don't have the facilities yet!",userkey);

	  return 0;

  }

  buf[9] = '\0'; // null-terminating the array...

  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 1; // 1 can be like... error-free login...

}

/** Replaces username and key in the slave's conf file */

int conf_replace(char *username){

  /* Note: SYSCONFDIR doesn't include a trailing slash */

  int maxlinelen = 120;

  char *fileOrig = SYSCONFDIR "/distrenslave.conf";

  char *fileRepl = SYSCONFDIR "/distrenslave.conf.edited";

  char *text2find = "!username";

  char *text2repl = username;

  char buffer[maxlinelen+2];

  char *buff_ptr, *find_ptr;

  FILE *fp1, *fp2;

  size_t find_len = strlen(text2find);

  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,text2find)))

          {

          while(buff_ptr < find_ptr)

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

          fputs(text2repl,fp2);

          buff_ptr += find_len;

          }

          fputs(buff_ptr,fp2);

      }

    rename(fileRepl, fileOrig);

  }

  fclose(fp2);

  fclose(fp1);

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

}

/* Executors */

/*

  It seems that the client will need to know the job number. fixme.

*/

/** Executor function for Blender operations */

void exec_blender(struct blendjob* blendjob, char *input, char *output, int frame)

{

  char *frame_str;

  asprintf(frame,frame_str); // Converts the int frame to a string, so it can be in the cmd array. GNU/*nix compatible only, fix before releasing win32, although dll for windows for asprintf exists!

  /* start execio code */

  	char *command = "blender"; // @TODO: append .exe if win32?

  	int ret;

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

  	char buf[10];

  	struct execio *testrem;

  	size_t readlen;

  	ret = execio_open(&testrem, command, cmd); // This path will be absolute for testing, should be relative to install on production

  	buf[9] = '\0'; // null-terminating the array...

  	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);

  /* end execio code */

  	if(ret == 1){

  		fprintf(stderr,"Error starting Blender. Check your install.");

  	}

  	else{

  		fprintf(stderr,"Blender at least started nicely, who knows if it rendered anything though.");

  	}

}