// WordDBInfo.cc
//
//
// Part of the ht://Dig package   <http://www.htdig.org/>
// Copyright (c) 1999-2004 The ht://Dig Group
// For copyright details, see the file COPYING in your distribution
// or the GNU Library General Public License (LGPL) version 2 or later
// <http://www.gnu.org/copyleft/lgpl.html>
//
//
#ifdef HAVE_CONFIG_H
#include "htconfig.h"
#endif /* HAVE_CONFIG_H */

#include <stdlib.h>
#include <stdio.h>

#include "db.h"
#include "WordDBInfo.h"

//
// WordDBInfo implementation
//

WordDBInfo* WordDBInfo::instance = 0;

//
// Like standard function but allows easy breakpoint setting.
//
static void message(const char *errpfx, char *msg)
{
  fprintf(stderr, "%s: %s\n", errpfx, msg);
}

WordDBInfo::WordDBInfo(const Configuration& config)
{
  dbenv = 0;

  if(config.Boolean("wordlist_env_skip")) return;

  int error;
  if((error = CDB_db_env_create(&dbenv, 0)) != 0) {
    fprintf(stderr, "WordDBInfo: CDB_db_env_create %s\n", CDB_db_strerror(error));
    return;
  }
  dbenv->set_errpfx(dbenv, "WordDB");
  dbenv->set_errcall(dbenv, message);
  if(dbenv->set_verbose(dbenv, DB_VERB_CHKPOINT, 1) != 0)
    return;
  if(dbenv->set_verbose(dbenv, DB_VERB_DEADLOCK, 1) != 0)
    return;
  if(dbenv->set_verbose(dbenv, DB_VERB_RECOVERY, 1) != 0)
    return;
  if(dbenv->set_verbose(dbenv, DB_VERB_WAITSFOR, 1) != 0)
    return;
  int cache_size = config.Value("wordlist_cache_size", 10*1024*1024);
  if(cache_size > 0) {
    if(dbenv->set_cachesize(dbenv, 0, cache_size, 1) != 0)
      return;
  }

  char* dir = 0;
  int flags = DB_CREATE;
  if(config.Boolean("wordlist_env_share")) {
    const String& env_dir = config["wordlist_env_dir"];
    if(env_dir.empty()) {
      fprintf(stderr, "WordDB: wordlist_env_dir not specified\n");
      return;
    }
    dir = strdup((const char*)env_dir);

    if(config.Boolean("wordlist_env_cdb"))
      flags |= DB_INIT_CDB;
    else
      flags |= DB_INIT_LOCK | DB_INIT_MPOOL;

  } else {
    flags |= DB_PRIVATE | DB_INIT_LOCK | DB_INIT_MPOOL;
  }

  if((error = dbenv->open(dbenv, (const char*)dir, NULL, flags, 0666)) != 0)
    dbenv->err(dbenv, error, "open %s", (dir ? dir : ""));
  if(dir) free(dir);
}

WordDBInfo::~WordDBInfo()
{
  if(dbenv) dbenv->close(dbenv, 0);
}

void 
WordDBInfo::Initialize(const Configuration &config_arg)
{
  if(instance != 0)
    delete instance;
  instance = new WordDBInfo(config_arg);
}