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/*
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 * $Id: dbck-cache.c,v 0.14 1993/10/13 00:18:09 ceder Exp $
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 * Copyright (C) 1991  Lysator Academic Computer Association.
 *
 * This file is part of the LysKOM server.
 * 
 * LysKOM is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by 
 * the Free Software Foundation; either version 1, or (at your option) 
 * any later version.
 * 
 * LysKOM 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 General Public License
 * for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with LysKOM; see the file COPYING.  If not, write to
 * Lysator, c/o ISY, Linkoping University, S-581 83 Linkoping, SWEDEN,
 * or the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, 
 * MA 02139, USA.
 *
 * Please mail bug reports to bug-lyskom@lysator.liu.se. 
 */
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/*
 * This module contains some very simple simulations of the routines in
 * cache.c.
 *
 * Extracted from ram-cache.c and rewritten by ceder.
 *
 * New database format with texts in their own file by Inge Wallin.
 *   Also save time as a time_t instead of a struct tm.
 */

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static char *rcsid = "$Id: dbck-cache.c,v 0.14 1993/10/13 00:18:09 ceder Exp $";
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#include "rcs.h"
USE(rcsid);
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#include <stdio.h>
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#ifndef SEEK_END
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#  include <fcntl.h>
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#endif
#ifndef SEEK_END
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#  include <unistd.h>
#endif
#ifndef SEEK_END
#  define SEEK_SET 0
#  define SEEK_END 2
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#endif
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#ifdef HAVE_STDLIB_H
#  include <stdlib.h>
#endif
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#include <time.h>
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#include <sys/types.h>
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#ifndef HAVE_DIFFTIME
#  include "tmp-difftime.h"
#endif
#ifdef TIME_SYNC
#  include <sys/resource.h>
#endif
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#include "exp.h"
#include "misc-types.h"
#include "kom-types.h"
#include "kom-errno.h"
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#include "cache.h"
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#include "tmp-limits.h"
#include "debug.h"
#include "server/smalloc.h"
#include "log.h"
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#include "lyskomd.h"
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#include "kom-memory.h"
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#include "ram-parse.h"
#include "ram-output.h"

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/*
 * All functions that can fail sets kom_errno to a suitable value
 * if they fail.
 */
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Person		* pers_arr[ MAX_CONF ];
Conference 	* conf_arr[ MAX_CONF ];
Conf_type	  conf_type_arr[ MAX_CONF ];
String		  name_list [ MAX_CONF ]; /* "cache" list */
			        	  /* Global var auto init to NULL */
int		  next_free_num = 1;

Text_stat 	* text_arr[ MAX_TEXT ];
int next_text_num = 1;

/* Defined in ramkomd.c */
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extern char datafilename[];
extern char backupfilename[];
extern char textfilename[];
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static FILE          *text_file = NULL;
static FILE	     *new_text_file = NULL; /* Used when garbage collecting. */

BUGDECL;


/* Macros */

#define TRACE2(format, arg) if ( buglevel > 2 ) printf(format, arg)
#define TRACE1(format) if ( buglevel > 2 ) printf(format)
#define TRACESTR(str)  if ( buglevel > 2 ) s_puts(str)
#define INRANGE(str, num, retval) if ( num == 0 || num >= next_free_num ) \
{			\
    return retval;	\
    printf("%s: conf_no %d out of range 1 ... %d ", str, num, next_free_num); \
    fflush(stdout);	\
    fflush(stderr);	\
    abort();		\
}

#define TEXT_RANGE(str, num, retval) if ( num == 0 || num >= next_text_num ) \
{	\
    return retval;\
    printf("Text_no out of range 1 ... %d ", next_text_num); \
    printf(str);	\
    fflush(stdout);	\
    fflush(stderr);	\
    abort(); 		\
}


extern Conf_type
cached_get_conf_type (Conf_no conf_no)
{
    return conf_arr [ conf_no ]->type;
}



#define IMPL(retval) if (1) { fflush(stderr); fflush(stdout); abort(); }


/*
 * Various function calls to tell the cache that something is changed.
 */

void
mark_person_as_changed(Pers_no	pers_no)
{
    TRACE2("Person %d is changed\n", pers_no);
    return;    
}


void
mark_conference_as_changed(Conf_no	conf_no)
{
    TRACE2("Conf.  %d is changed\n", conf_no);
    return;
}

void
mark_text_as_changed( Text_no text_no )
{
    TRACE2("Text %d is changed.\n", text_no);
    TEXT_RANGE("mark_text_as_changed\n", text_no, (void)0);
}    


/*
 * Person-related calls
 */


extern Success
cached_create_person( Pers_no person )
{
    TRACE2("Person %d is being created.\n", person);
    INRANGE("cached_create_person\n", person, FAILURE);

    if ( pers_arr[ person ] != NULL )
    {
	TRACE1("pers_arr not NULL");
	fflush(stdout);
	fflush(stderr);
	abort();
    }
    
    pers_arr[ person ] = alloc_person();
    return OK;
}


extern Person *
cached_get_person_stat( Pers_no	person )
{
    INRANGE("cached_get_person_stat\n", person, NULL);
    TRACE2("cached_get_person_stat %d\n", person);
    kom_errno = KOM_UNDEF_PERS;
    
    return pers_arr[ person ];
}



/*
 * Conference-related calls
 */
extern Conf_no	/* Also cache the name */
cached_create_conf (String  name)
{
    Conference * conf_c;
    Conf_no	 conf_no;

    TRACE1("cached_create_conf( ");
    TRACESTR(name);
    TRACE1(" )\n");

    if ( next_free_num >= MAX_CONF )
    {
	kom_errno = KOM_INDEX_OUT_OF_RANGE;
	return 0;
    }
    
    conf_no = next_free_num++;
    conf_c  = alloc_conference();

    conf_c->name = EMPTY_STRING;
    s_strcpy(&conf_c->name, name);

    TRACE2(" number %d\n", conf_no);

    conf_arr[ conf_no ] = conf_c;
    pers_arr[ conf_no ] = NULL;
    
    return conf_no;
}

extern Success
cached_delete_conf( Conf_no	conf )
{
    INRANGE("cached_delete_conf()", conf, FAILURE);
    if ( conf_arr[ conf ] == NULL )
    {
	kom_errno = KOM_UNDEF_CONF;
	return FAILURE;
    }
    free_conference(conf_arr[ conf ]);
    conf_arr[ conf ] = NULL;
    return OK;
}

Success
cached_delete_person(Pers_no pers)
{
    INRANGE("cached_delete_person()", pers, FAILURE);
    if ( pers_arr[ pers ] == NULL )
    {
	kom_errno = KOM_UNDEF_PERS;
	return FAILURE;
    }

    pers_arr[ pers ] = NULL;
    return OK;
}

Success
cached_delete_text(Text_no text)
{
    TEXT_RANGE("cached_delete_text()", text, FAILURE);
    if ( text_arr[ text ] == NULL )
    {
	kom_errno = KOM_NO_SUCH_TEXT;
	return FAILURE;
    }
    free_text_stat(text_arr[ text ]);
    text_arr[ text ] = NULL;
    return OK;
    
}


extern Conference *
cached_get_conf_stat(	Conf_no		conf_no )
{
    INRANGE("cached_get_conf_stat\n", conf_no, NULL);
    TRACE2("cached_get_conf_stat %d\n", conf_no);
    kom_errno = KOM_UNDEF_CONF;
    
    return conf_arr[ conf_no ];
}

/*
 * Return TRUE if conf_no exists.
 */
Bool
cached_conf_exists(Conf_no conf_no)
{
    return conf_arr[ conf_no ] != NULL ? TRUE : FALSE;
}

    
/*
 * Calls to handle texts
 */

extern String
cached_get_text( Text_no text )
{
    String  the_string;

    TEXT_RANGE("cached_get_text\n", text, EMPTY_STRING);
    TRACE2("cached_get_text %d\n", text);

    if ( text_arr[ text ] == NULL )
	return EMPTY_STRING;
    else
    {
	the_string.string = tmp_alloc( text_arr[text]->no_of_chars );
	the_string.len = text_arr[text]->no_of_chars;
	fseek(text_file, text_arr[ text ]->file_pos, SEEK_SET);
	if ( fread(the_string.string, sizeof(char), the_string.len, text_file)
	    != the_string.len )
	{
	    log("WARNING: cached_get_text: "
		"couldn't read enough characters of text %d\n",
		text);
	}
		    
	return the_string;
    }
}

extern Text_stat *	/* NULL on error */
cached_get_text_stat(	Text_no		text )
{
    kom_errno = KOM_NO_SUCH_TEXT;
    TEXT_RANGE("cached_get_text_stat\n", text, NULL);
    TRACE2("cached_get_text_stat %d\n", text);
    
    return text_arr[ text ];
}



/*
 * The text is set up with an empty misc-field. The misc field is
 * later initialized by create_text.
 */

#if 0
extern Text_no
cached_create_text( String message)
{
    Text_no tno;

    tno = next_text_num++;

    TRACE2("cached_create_text (len=%d)\n", message.len);

    if ( tno >= MAX_TEXT )
    {
	kom_errno = KOM_INDEX_OUT_OF_RANGE;
	next_text_num = MAX_TEXT;
	
	return 0;
    }
        
    text_arr[ tno ] = alloc_text_stat();
    text_arr[ tno ]->no_of_misc = 0;
    text_arr[ tno ]->misc_items = NULL;
    text_arr[ tno ]->no_of_marks = 0;
    text_arr[ tno ]->no_of_lines = 0;
    text_arr[ tno ]->no_of_chars = 0;
    fseek(text_file, 0, SEEK_END);
    text_arr[ tno ]->file_pos = ftell(text_file);

    if ( fwrite(message.string, sizeof(char), message.len, text_file)
	!= message.len ) {
	log("WARNING: cached_create_text: Couldn't write the text %d\n",
	    tno);
    }

    fflush(text_file);
    
    TRACE2("cached_create_text -> %d\n", tno);
    
    return tno;
}
#endif

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void
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cached_flush_text(Text_no text_no,
		  String message)
{
    if ( text_no >= next_text_num )
    {
	log("cached_flush_text(%lu, string): only text %lu exists.",
	    (u_long) text_no, (u_long) next_text_num);
	return;
    }
        
    fseek(new_text_file, 0, SEEK_END);
    text_arr[ text_no ]->file_pos = ftell(new_text_file);

    if ( fwrite(message.string, sizeof(char), message.len, new_text_file)
	!= message.len )
    {
	log("WARNING: cached_flush_text: Couldn't write the text %d\n",
	    text_no);
    }

    fflush(new_text_file);
}

Text_no
traverse_text(Text_no seed)
{
    seed++;
    
    while ( seed < next_text_num && text_arr[ seed ] == NULL )
	seed++;

    return (seed == next_text_num) ? 0 : seed ;
}

Pers_no
traverse_person(Pers_no seed)
{
    seed++;
    
    while ( seed < next_free_num && pers_arr[ seed ] == NULL )
	seed++;

    return (seed == next_free_num) ? 0 : seed ;
}

Conf_no
traverse_conference(Conf_no seed)
{
    seed++;
    
    while ( seed < next_free_num && conf_arr[ seed ] == NULL )
	seed++;

    return (seed == next_free_num) ? 0 : seed ;
}

extern Garb_nice
cached_get_garb_nice (Conf_no conf_no)
{
    return conf_arr [ conf_no ]->nice;
}

extern Local_text_no
cached_get_highest_local_no (Conf_no conf_no)
{
    return ( conf_arr [ conf_no ]->texts.first_local_no
	    - 1 + conf_arr [ conf_no ]->texts.no_of_texts );
}

/* Lock a person struct in memory. Increase a referenc count. */
void
cached_lock_person(Pers_no pers_no)
{}

/* Decrease reference count. If zero, unlock person. */
void
cached_unlock_person(Pers_no pers_no)
{}

/* Lock a conf struct in memory. Increase a referenc count. */
void
cached_lock_conf(Conf_no conf_no)
{}

/* Decrease reference count. If zero, unlock conf. */
void
cached_unlock_conf(Conf_no conf_no)
{}




static Bool
is_clean(const char *fn)
{
    FILE *fp;

    if ( (fp = fopen(fn, "rb")) == NULL )
	return FALSE;

    if ( getc(fp) == 'C' && getc(fp) == 'L' && getc(fp) == 'E'
	&& getc(fp) == 'A' && getc(fp) == 'N' )
    {
	fclose(fp);
	return TRUE;
    }
    else
    {
	fclose(fp);
	return FALSE;
    }
}

#ifdef TIME_SYNC
static long
timerdiff(struct timeval a,
	   struct timeval b)
{
    return a.tv_sec - b.tv_sec;
}
#endif

extern void			/* Write out everything. */
cache_sync(void)
{
    FILE *fp;
    int i;

#ifdef TIME_SYNC
    struct rusage start, after_confs, after_persons, after_text_stats,
    	after_text_masses;
    time_t st, ac, ap, ats, atm;
    void getrusage(int who, struct rusage *rusage);
#endif
    
#ifdef TIME_SYNC
    getrusage(0, &start);
    time(&st);
#endif

    if ( is_clean(datafilename) )
    {
	if ( rename(datafilename, backupfilename) != 0 )
	    log("WARNING: cache_sync: can't backup.\n");
    }
    else
	log("cache_sync: datafile not clean. No backup taken.\n");
    
    if ( (fp=fopen(datafilename, "w") ) == NULL )
    {
	log("WARNING: cache_sync: can't open file to save in.\n");
	return;
    }

    fprintf(fp, "DIRTY\n");		 /* DIRTY-FLAG */

    fprintf(fp, "%d\n", next_free_num);	  /* NEXT_FREE_NUM */

    for ( i = 1; i < next_free_num; i++ ) /* CONFS */
    {
	if ( conf_arr[ i ] == NULL )
	    fprintf(fp, "@");
	else
	{
	    fprintf(fp, "+ ");
	    foutput_conference(fp, conf_arr[ i ]);
	}
	putc('\n', fp);
    }
#ifdef TIME_SYNC
    getrusage(0, &after_confs);
    time(&ac);
#endif

    for ( i = 1; i < next_free_num; i++ ) /* PERSONS */
    {
	if ( pers_arr[ i ] == NULL )
	    fprintf(fp, "@");
	else
	{
	    fprintf(fp, "+ %dH", PASSWD_LEN);
	    fwrite(pers_arr[ i ]->pwd, PASSWD_LEN, 1, fp);
	    foutput_person(fp, pers_arr[ i ]);
	}
	putc('\n', fp);
    }
#ifdef TIME_SYNC
    getrusage(0, &after_persons);
    time(&ap);
#endif

    fprintf(fp, "%d\n", next_text_num);	/* NEXT_TEXT_NUM */

    for ( i = 1; i < next_text_num; i++ ) /* TEXT_STATS */
    {
	if ( text_arr[ i ] == NULL )
	    fprintf(fp, "@");
	else
	{
	    fprintf(fp, "+ ");
	    foutput_text_stat(fp, text_arr[ i ]);
	}
	putc('\n', fp);
    }

#ifdef TIME_SYNC
    getrusage(0, &after_text_stats);
    time(&ats);

    getrusage(0, &after_text_masses);
    time(&atm);
#endif

    rewind(fp);
    fprintf(fp, "CLEAN");
    fclose(fp);

#ifdef TIME_SYNC
    log("Sync ready.\n"
    	"User: %4ld sec (%4ld conf, %4ld pers, %4ld stat, %4ld text)\n"
    	"Sys:  %4ld sec (%4ld conf, %4ld pers, %4ld stat, %4ld text)\n"
	"Real: %4ld sec (%4ld conf, %4ld pers, %4ld stat, %4ld text)\n"
	"Page faults: %4ld. Swapped: %4ld. Outblocked: %4ld.\n",
	
	timerdiff(after_text_masses.ru_utime, start.ru_utime),
	timerdiff(after_confs.ru_utime, start.ru_utime),
	timerdiff(after_persons.ru_utime, after_confs.ru_utime),
	timerdiff(after_text_stats.ru_utime, after_persons.ru_utime),
	timerdiff(after_text_masses.ru_utime, after_text_stats.ru_utime),
	
	timerdiff(after_text_masses.ru_stime, start.ru_stime),
	timerdiff(after_confs.ru_stime, start.ru_stime),
	timerdiff(after_persons.ru_stime, after_confs.ru_stime),
	timerdiff(after_text_stats.ru_stime, after_persons.ru_stime),
	timerdiff(after_text_masses.ru_stime, after_text_stats.ru_stime),

	(u_long)difftime(atm, st),
	(u_long)difftime(ac, st),
	(u_long)difftime(ap, ac),
	(u_long)difftime(ats, ap),
	(u_long)difftime(atm, ats),

	after_text_masses.ru_majflt - start.ru_majflt,
	after_text_masses.ru_nswap - start.ru_nswap,
	after_text_masses.ru_oublock - start.ru_oublock);
#endif    
}

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void
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cache_open_new_text_file(void)
{
    if ( ( new_text_file = fopen(textfilename, "w")) == NULL )
    {
	log("Can't open file to save new texts. Goodbye.\n");
	exit(1);
    }
}

extern Success
init_cache(void)
{
    FILE *fp = NULL;
    int i;
    extern int vflag;		/* from dbck.c */
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    extern Bool truncated_texts; /* from dbck.c */
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    new_text_file = NULL;
    
    if ( (text_file = fopen(textfilename, "rb")) == NULL )
    {
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	perror(textfilename);
	restart_kom("ERROR: init_cache: can't open text file %s.\n",
		    textfilename);
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    }

    if ( is_clean(datafilename) )
    {
	if ( (fp = fopen(datafilename, "rb")) == NULL )
	{
	    log("WARNING: init_cache: can't open datafile.\n");
	    return FAILURE;
	}
	log("MSG: init_cache: using datafile.\n");
    }
    else if ( is_clean(backupfilename) )
    {
	if ( (fp = fopen(backupfilename, "rb")) == NULL )
	{
	    log("WARNING: init_cache: can't open backupfile.\n");
	    return FAILURE;
	}
	log("MSG: init_cache: using backup file.\n");
    }
    else
    {
	log("WARNING: init_cache: can't find old data base.\n");
	return FAILURE;
    }
        
    fseek(fp, 6, SEEK_SET);	/* skip clean/dirty flag. */

    next_free_num = fparse_long(fp);	  /* NEXT_FREE_NUM */

    if ( vflag )
	log("Reading %d conferences, starting at pos %d.\n",
	    next_free_num-1, ftell(fp));

    for ( i = 1; i < next_free_num; i++ ) /* CONFS */
    {
	fskipwhite(fp);
	switch(getc(fp))
	{
	case '@':
	    conf_arr[ i ] = NULL;
	    break;

	case '+':
	    conf_arr[ i ] = alloc_conference();
	    if ( fparse_conference(fp, conf_arr[ i ]) != OK )
		restart_kom("init_cache(): fparse_conference failed. "
			    "i == %d\n", i);

	    name_list[i] = EMPTY_STRING;
	    s_strcpy(&name_list[i], conf_arr[ i ]->name);
	    
	    break;
	}
    }

    if ( vflag )
	log("Reading %d persons, starting at pos %d.\n",
	    next_free_num-1, ftell(fp));

    for ( i = 1; i < next_free_num; i++ ) /* PERSONS */
    {
	fskipwhite(fp);
	switch(getc(fp))
	{
	case '@':
	    pers_arr[ i ] = NULL;
	    break;

	case '+':
	    pers_arr[ i ] = alloc_person();
	    if ( fparse_person(fp, pers_arr[ i ]) != OK )
		restart_kom("init_cache: fparse_person failed. i == %d\n", i);
	    
	    break;
	}
    }

    next_text_num = fparse_long(fp);	/* NEXT_TEXT_NUM */

    if ( vflag )
	log("Reading %d texts, starting at pos %d.\n",
	    next_text_num-1, ftell(fp));

    for ( i = 1; i < next_text_num; i++ ) /* TEXT_STATS */
    {
	fskipwhite(fp);
	switch(getc(fp))
	{
	case '@':
	    text_arr[ i ] = NULL;
	    break;

	case '+':
	    text_arr[ i ] = alloc_text_stat();
	    if ( fparse_text_stat(fp, text_arr[ i ]) != OK )
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	    {
		/* Simply ignore the following texts.  The cause of this
		   error might be that the file has been truncated (maybe
		   due to an overfull disk). */

		log("init_cache(): fparse_text_stat failed for text %d.\n"
		    "All remaining texts are lost.\n", i);
		next_text_num = i;
		truncated_texts = TRUE;
	    }

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	    break;
	}
    }

    log("Read %d confs/persons and %d texts, eof at %d\n",
	next_free_num-1, next_text_num-1, ftell(fp));

    fclose(fp);

    return OK;
}