~drizzle-trunk/drizzle/development

/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2008 Sun Microsystems, Inc.

 *

 *  This program 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; version 2 of the License.

 *

 *  This program 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 this program; if not, write to the Free Software

 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#include "config.h"

#include <pthread.h>

#include <signal.h>

#include <sys/resource.h>

#include <unistd.h>

#include <sys/stat.h>

#include <sys/types.h>

#if TIME_WITH_SYS_TIME

# include <sys/time.h>

# include <time.h>

#else

# if HAVE_SYS_TIME_H

#  include <sys/time.h>

# else

#  include <time.h>

# endif

#endif

#if defined(HAVE_LOCALE_H)

# include <locale.h>

#endif

#include <boost/filesystem.hpp>

#include "drizzled/plugin.h"

#include "drizzled/gettext.h"

#include "drizzled/configmake.h"

#include "drizzled/session.h"

#include "drizzled/session/cache.h"

#include "drizzled/internal/my_sys.h"

#include "drizzled/unireg.h"

#include "drizzled/drizzled.h"

#include "drizzled/errmsg_print.h"

#include "drizzled/data_home.h"

#include "drizzled/plugin/listen.h"

#include "drizzled/plugin/client.h"

#include "drizzled/pthread_globals.h"

#include "drizzled/tztime.h"

#include "drizzled/signal_handler.h"

#include "drizzled/replication_services.h"

#include "drizzled/transaction_services.h"

#include "drizzled/catalog/local.h"

#include "drizzled/util/backtrace.h"

using namespace drizzled;

using namespace std;

namespace fs=boost::filesystem;

static pthread_t select_thread;

static uint32_t thr_kill_signal;

/**

  All global error messages are sent here where the first one is stored

  for the client.

*/

static void my_message_sql(drizzled::error_t error, const char *str, myf MyFlags)

{

  Session *session;

  /*

    Put here following assertion when situation with EE_* error codes

    will be fixed

  */

  if ((session= current_session))

  {

    if (MyFlags & ME_FATALERROR)

      session->is_fatal_error= 1;

    /*

      TODO: There are two exceptions mechanism (Session and sp_rcontext),

      this could be improved by having a common stack of handlers.

    */

    if (session->handle_error(error, str,

                          DRIZZLE_ERROR::WARN_LEVEL_ERROR))

      return;;

    /*

      session->lex->current_select == 0 if lex structure is not inited

      (not query command (COM_QUERY))

    */

    if (! (session->lex->current_select &&

        session->lex->current_select->no_error && !session->is_fatal_error))

    {

      if (! session->main_da.is_error())            // Return only first message

      {

        if (error == EE_OK)

          error= ER_UNKNOWN_ERROR;

        if (str == NULL)

          str= ER(error);

        session->main_da.set_error_status(error, str);

      }

    }

    if (!session->no_warnings_for_error && !session->is_fatal_error)

    {

      /*

        Suppress infinite recursion if there a memory allocation error

        inside push_warning.

      */

      session->no_warnings_for_error= true;

      push_warning(session, DRIZZLE_ERROR::WARN_LEVEL_ERROR, error, str);

      session->no_warnings_for_error= false;

      }

    }

    if (!session || MyFlags & ME_NOREFRESH)

        errmsg_printf(ERRMSG_LVL_ERROR, "%s: %s",internal::my_progname,str);

}

static void init_signals(void)

{

  sigset_t set;

  struct sigaction sa;

  if (!(test_flags.test(TEST_NO_STACKTRACE) || 

        test_flags.test(TEST_CORE_ON_SIGNAL)))

  {

    sa.sa_flags = SA_RESETHAND | SA_NODEFER;

    sigemptyset(&sa.sa_mask);

    sigprocmask(SIG_SETMASK,&sa.sa_mask,NULL);

    sa.sa_handler= drizzled_handle_segfault;

    sigaction(SIGSEGV, &sa, NULL);

    sigaction(SIGABRT, &sa, NULL);

#ifdef SIGBUS

    sigaction(SIGBUS, &sa, NULL);

#endif

    sigaction(SIGILL, &sa, NULL);

    sigaction(SIGFPE, &sa, NULL);

  }

  if (test_flags.test(TEST_CORE_ON_SIGNAL))

  {

    /* Change limits so that we will get a core file */

    struct rlimit rl;

    rl.rlim_cur = rl.rlim_max = RLIM_INFINITY;

    if (setrlimit(RLIMIT_CORE, &rl) && global_system_variables.log_warnings)

        errmsg_printf(ERRMSG_LVL_WARN,

                      _("setrlimit could not change the size of core files "

                        "to 'infinity';  We may not be able to generate a "

                        "core file on signals"));

  }

  (void) sigemptyset(&set);

  ignore_signal(SIGPIPE);

  sigaddset(&set,SIGPIPE);

#ifndef IGNORE_SIGHUP_SIGQUIT

  sigaddset(&set,SIGQUIT);

  sigaddset(&set,SIGHUP);

#endif

  sigaddset(&set,SIGTERM);

  /* Fix signals if blocked by parents (can happen on Mac OS X) */

  sigemptyset(&sa.sa_mask);

  sa.sa_flags = 0;

  sa.sa_handler = drizzled_print_signal_warning;

  sigaction(SIGTERM, &sa, NULL);

  sa.sa_flags = 0;

  sa.sa_handler = drizzled_print_signal_warning;

  sigaction(SIGHUP, &sa, NULL);

#ifdef SIGTSTP

  sigaddset(&set,SIGTSTP);

#endif

  if (test_flags.test(TEST_SIGINT))

  {

    sa.sa_flags= 0;

    sa.sa_handler= drizzled_end_thread_signal;

    sigaction(thr_kill_signal, &sa, NULL);

    // May be SIGINT

    sigdelset(&set, thr_kill_signal);

  }

  else

  {

    sigaddset(&set,SIGINT);

  }

  sigprocmask(SIG_SETMASK,&set,NULL);

  pthread_sigmask(SIG_SETMASK,&set,NULL);

  return;

}

static void GoogleProtoErrorThrower(google::protobuf::LogLevel level,

                                    const char* ,

                                    int, const string& ) throw(const char *)

{

  switch(level)

  {

  case google::protobuf::LOGLEVEL_INFO:

    break;

  case google::protobuf::LOGLEVEL_WARNING:

  case google::protobuf::LOGLEVEL_ERROR:

  case google::protobuf::LOGLEVEL_FATAL:

  default:

    throw("error in google protocol buffer parsing");

  }

}

int main(int argc, char **argv)

{

#if defined(ENABLE_NLS)

# if defined(HAVE_LOCALE_H)

  setlocale(LC_ALL, "");

# endif

  bindtextdomain("drizzle7", LOCALEDIR);

  textdomain("drizzle7");

#endif

  module::Registry &modules= module::Registry::singleton();

  MY_INIT(argv[0]);		// init my_sys library & pthreads

  /* nothing should come before this line ^^^ */

  /* Set signal used to kill Drizzle */

  thr_kill_signal= SIGINT;

  google::protobuf::SetLogHandler(&GoogleProtoErrorThrower);

  /* Function generates error messages before abort */

  error_handler_hook= my_message_sql;

  /* init_common_variables must get basic settings such as data_home_dir

     and plugin_load_list. */

  if (init_common_variables(argc, argv, modules))

    unireg_abort(1);				// Will do exit

  /*

    init signals & alarm

    After this we can't quit by a simple unireg_abort

  */

  init_signals();

  select_thread=pthread_self();

  select_thread_in_use=1;

  if (not opt_help)

  {

    if (chdir(getDataHome().file_string().c_str()))

    {

      errmsg_printf(ERRMSG_LVL_ERROR,

                    _("Data directory %s does not exist\n"),

                    getDataHome().file_string().c_str());

      unireg_abort(1);

    }

    if (mkdir("local", 0700))

    {

      /* We don't actually care */

    }

    if (chdir("local"))

    {

      errmsg_printf(ERRMSG_LVL_ERROR,

                    _("Local catalog %s/local does not exist\n"),

                    getDataHome().file_string().c_str());

      unireg_abort(1);

    }

    full_data_home= fs::system_complete(getDataHome());

  }

  if (server_id == 0)

  {

    server_id= 1;

  }

  if (init_server_components(modules))

    unireg_abort(1);

  /**

   * This check must be done after init_server_components for now

   * because we don't yet have plugin dependency tracking...

   *

   * ReplicationServices::evaluateRegisteredPlugins() will print error messages to stderr

   * via errmsg_printf().

   *

   * @todo

   *

   * not checking return since unireg_abort() hangs

   */

  ReplicationServices &replication_services= ReplicationServices::singleton();

    (void) replication_services.evaluateRegisteredPlugins();

  if (plugin::Listen::setup())

    unireg_abort(1);

  assert(plugin::num_trx_monitored_objects > 0);

  if (drizzle_rm_tmp_tables() ||

      my_tz_init((Session *)0, default_tz_name))

  {

    abort_loop= true;

    select_thread_in_use=0;

    (void) pthread_kill(signal_thread, SIGTERM);

    (void) unlink(pid_file.file_string().c_str());	// Not needed anymore

    exit(1);

  }

  errmsg_printf(ERRMSG_LVL_INFO, _(ER(ER_STARTUP)), internal::my_progname,

                PANDORA_RELEASE_VERSION, COMPILATION_COMMENT);

  TransactionServices &transaction_services= TransactionServices::singleton();

  /* Send server startup event */

  {

    Session::shared_ptr session;

    if ((session= Session::make_shared(plugin::Listen::getNullClient(), catalog::local())))

    {

      currentSession().release();

      currentSession().reset(session.get());

      transaction_services.sendStartupEvent(*session.get());

    }

  }

  /* 

    Listen for new connections and start new session for each connection

     accepted. The listen.getClient() method will return NULL when the server

     should be shutdown.

   */

  plugin::Client *client;

  while ((client= plugin::Listen::getClient()) != NULL)

  {

    Session::shared_ptr session;

    session= Session::make_shared(client, catalog::local());

    if (not session)

    {

      delete client;

      continue;

    }

    /* If we error on creation we drop the connection and delete the session. */

    if (Session::schedule(session))

      Session::unlink(session);

  }

  /* Send server shutdown event */

  {

    Session::shared_ptr session;

    if ((session= Session::make_shared(plugin::Listen::getNullClient(), catalog::local())))

    {

      currentSession().release();

      currentSession().reset(session.get());

      transaction_services.sendShutdownEvent(*session.get());

    }

  }

  {

    boost::mutex::scoped_lock scopedLock(session::Cache::singleton().mutex());

    select_thread_in_use= false;			// For close_connections

  }

  COND_thread_count.notify_all();

  /* Wait until cleanup is done */

  {

    boost::mutex::scoped_lock scopedLock(session::Cache::singleton().mutex());

    while (not ready_to_exit)

      COND_server_end.wait(scopedLock);

  }

  clean_up(1);

  module::Registry::shutdown();

  internal::my_end();

  return 0;

}