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/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008-2009 Sun Microsystems, Inc.
* Copyright (C) 2010 Jay Pipes <jaypipes@gmail.com>
*
* Authors:
*
* Jay Pipes <jaypipes@gmail.com.com>
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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
*/
/**
* @file
*
* Transaction log module initialization and plugin
* registration.
*/
#include <config.h>
#include "transaction_log.h"
#include "transaction_log_applier.h"
#include "transaction_log_index.h"
#include "data_dictionary_schema.h"
#include "print_transaction_message.h"
#include "hexdump_transaction_message.h"
#include <errno.h>
#include <drizzled/plugin/plugin.h>
#include <drizzled/session.h>
#include <drizzled/gettext.h>
#include <boost/program_options.hpp>
#include <drizzled/module/option_map.h>
#include <drizzled/plugin/function.h>
namespace po= boost::program_options;
using namespace std;
using namespace drizzled;
/**
* The name of the main transaction log file on disk. With no prefix,
* this goes into Drizzle's $datadir.
*/
static const char DEFAULT_LOG_FILE_PATH[]= "transaction.log"; /* In datadir... */
/**
* Transaction Log plugin system variable - Is the log enabled? Only used on init().
*/
static bool sysvar_transaction_log_enabled= false;
/** Transaction Log plugin system variable - The path to the log file used */
static string sysvar_transaction_log_file;
/**
* Transaction Log plugin system variable - A debugging variable to assist
* in truncating the log file.
*/
static bool sysvar_transaction_log_truncate_debug= false;
/**
* Transaction Log plugin system variable - Should we write a CRC32 checksum for
* each written Transaction message?
*/
static bool sysvar_transaction_log_checksum_enabled= false;
/**
* Numeric option controlling the sync/flush behaviour of the transaction
* log. Options are:
*
* TransactionLog::FLUSH_FREQUENCY_OS == 0 ... let OS do sync'ing
* TransactionLog::FLUSH_FREQUENCY_EVERY_WRITE == 1 ... sync on every write
* TransactionLog::FLUSH_FREQUENCY_EVERY_SECOND == 2 ... sync at most once a second
*/
typedef constrained_check<uint32_t, 2, 0> flush_constraint;
static flush_constraint sysvar_transaction_log_flush_frequency;
/**
* Transaction Log plugin system variable - Number of slots to create
* for managing write buffers
*/
typedef constrained_check<uint32_t, 8192, 4> write_buffers_constraint;
static write_buffers_constraint sysvar_transaction_log_num_write_buffers;
/**
* Transaction Log plugin system variable - The name of the replicator plugin
* to pair the transaction log's applier with. Defaults to "default"
*/
static const char DEFAULT_USE_REPLICATOR[]= "default";
static string sysvar_transaction_log_use_replicator;
/** DATA_DICTIONARY views */
static TransactionLogTool *transaction_log_tool;
static TransactionLogEntriesTool *transaction_log_entries_tool;
static TransactionLogTransactionsTool *transaction_log_transactions_tool;
/** Index defined in transaction_log_index.cc */
extern TransactionLogIndex *transaction_log_index;
/** Transaction Log descriptor defined in transaction_log.cc */
extern TransactionLog *transaction_log;
/** Transaction Log descriptor defined in transaction_log.cc */
extern TransactionLogApplier *transaction_log_applier;
/** Defined in print_transaction_message.cc */
extern plugin::Create_function<PrintTransactionMessageFunction> *print_transaction_message_func_factory;
extern plugin::Create_function<HexdumpTransactionMessageFunction> *hexdump_transaction_message_func_factory;
TransactionLog::~TransactionLog()
{
/* Clear up any resources we've consumed */
if (log_file != -1)
{
(void) close(log_file);
}
}
static void set_truncate_debug(Session *, sql_var_t)
{
if (transaction_log)
{
if (sysvar_transaction_log_truncate_debug)
{
transaction_log->truncate();
transaction_log_index->clear();
sysvar_transaction_log_truncate_debug= false;
}
}
}
static int init(drizzled::module::Context &context)
{
context.registerVariable(new sys_var_bool_ptr_readonly("enable",
&sysvar_transaction_log_enabled));
context.registerVariable(new sys_var_bool_ptr("truncate-debug",
&sysvar_transaction_log_truncate_debug,
set_truncate_debug));
context.registerVariable(new sys_var_const_string("file",
sysvar_transaction_log_file));
context.registerVariable(new sys_var_const_string("use-replicator",
sysvar_transaction_log_use_replicator));
context.registerVariable(new sys_var_bool_ptr_readonly("enable-checksum",
&sysvar_transaction_log_checksum_enabled));
context.registerVariable(new sys_var_constrained_value_readonly<uint32_t>("flush-frequency", sysvar_transaction_log_flush_frequency));
context.registerVariable(new sys_var_constrained_value_readonly<uint32_t>("num-write-buffers",
sysvar_transaction_log_num_write_buffers));
/* Create and initialize the transaction log itself */
if (sysvar_transaction_log_enabled)
{
transaction_log= new TransactionLog(sysvar_transaction_log_file,
static_cast<int>(sysvar_transaction_log_flush_frequency),
sysvar_transaction_log_checksum_enabled);
if (transaction_log == NULL)
{
sql_perror(_("Failed to allocate the TransactionLog instance"), sysvar_transaction_log_file);
return 1;
}
else
{
/* Check to see if the log was not created properly */
if (transaction_log->hasError())
{
errmsg_printf(error::ERROR, _("Failed to initialize the Transaction Log. Got error: %s\n"),
transaction_log->getErrorMessage().c_str());
return 1;
}
}
/* Create and initialize the transaction log index */
transaction_log_index= new TransactionLogIndex(*transaction_log);
/* Check to see if the index was not created properly */
if (transaction_log_index->hasError())
{
errmsg_printf(error::ERROR, _("Failed to initialize the Transaction Log Index. Got error: %s\n"),
transaction_log_index->getErrorMessage().c_str());
return 1;
}
/* Create the applier plugin and register it */
transaction_log_applier= new TransactionLogApplier("transaction_log_applier",
transaction_log,
transaction_log_index,
static_cast<uint32_t>(sysvar_transaction_log_num_write_buffers));
context.add(transaction_log_applier);
ReplicationServices::attachApplier(transaction_log_applier, sysvar_transaction_log_use_replicator);
/* Setup DATA_DICTIONARY views */
transaction_log_tool= new TransactionLogTool;
context.add(transaction_log_tool);
transaction_log_entries_tool= new TransactionLogEntriesTool;
context.add(transaction_log_entries_tool);
transaction_log_transactions_tool= new TransactionLogTransactionsTool;
context.add(transaction_log_transactions_tool);
/* Setup the module's UDFs */
print_transaction_message_func_factory=
new plugin::Create_function<PrintTransactionMessageFunction>("print_transaction_message");
context.add(print_transaction_message_func_factory);
hexdump_transaction_message_func_factory=
new plugin::Create_function<HexdumpTransactionMessageFunction>("hexdump_transaction_message");
context.add(hexdump_transaction_message_func_factory);
}
return 0;
}
static void init_options(drizzled::module::option_context &context)
{
context("truncate-debug",
po::value<bool>(&sysvar_transaction_log_truncate_debug)->default_value(false)->zero_tokens(),
_("DEBUGGING - Truncate transaction log"));
context("enable-checksum",
po::value<bool>(&sysvar_transaction_log_checksum_enabled)->default_value(false)->zero_tokens(),
_("Enable CRC32 Checksumming of each written transaction log entry"));
context("enable",
po::value<bool>(&sysvar_transaction_log_enabled)->default_value(false)->zero_tokens(),
_("Enable transaction log"));
context("file",
po::value<string>(&sysvar_transaction_log_file)->default_value(DEFAULT_LOG_FILE_PATH),
_("Path to the file to use for transaction log"));
context("use-replicator",
po::value<string>(&sysvar_transaction_log_use_replicator)->default_value(DEFAULT_USE_REPLICATOR),
_("Name of the replicator plugin to use (default='default_replicator')"));
context("flush-frequency",
po::value<flush_constraint>(&sysvar_transaction_log_flush_frequency)->default_value(0),
_("0 == rely on operating system to sync log file (default), 1 == sync file at each transaction write, 2 == sync log file once per second"));
context("num-write-buffers",
po::value<write_buffers_constraint>(&sysvar_transaction_log_num_write_buffers)->default_value(8),
_("Number of slots for in-memory write buffers (default=8)."));
}
DRIZZLE_PLUGIN(init, NULL, init_options);
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