#!/bin/sh
#
# 
# MySQL
#
# Description:	Manages a MySQL database as Linux-HA resource

#
# Author:	Alan Robertson 		: DB2 Script
# Author:	Jakub Janczak  		: Rewrite as MySQL
# Author:	Andrew Beekhof 		: Cleanup and import
# Author:	Sebastian Reitenbach 	: add OpenBSD defaults, more cleanup
#
# Support:	linux-ha@lists.linux-ha.org
# License:	GNU General Public License (GPL)
# Copyright:	(C) 2002 - 2005 International Business Machines, Inc.
#
# An example usage in /etc/ha.d/haresources: 
#       node1  10.0.0.170 mysql
#
# See usage() function below for more details...
#
# OCF instance parameters:
#   OCF_RESKEY_binary
#   OCF_RESKEY_config
#   OCF_RESKEY_datadir
#   OCF_RESKEY_user
#   OCF_RESKEY_group
#   OCF_RESKEY_test_table
#   OCF_RESKEY_test_user
#   OCF_RESKEY_test_password
#   OCF_RESKEY_enable_creation
#   OCF_RESKEY_additional_parameters
#   OCF_RESKEY_log
#   OCF_RESKEY_pid
#   OCF_RESKEY_socket

#######################################################################
# Initialization:

. ${OCF_ROOT}/resource.d/heartbeat/.ocf-shellfuncs

#######################################################################

# Fill in some defaults if no values are specified
HOSTOS=`uname`
if [ "X${HOSTOS}" == "XOpenBSD" ];then
OCF_RESKEY_binary_default="/usr/local/bin/mysqld_safe"
OCF_RESKEY_config_default="/etc/my.cnf"
OCF_RESKEY_datadir_default="/var/mysql"
OCF_RESKEY_user_default="_mysql"
OCF_RESKEY_group_default="_mysql"
OCF_RESKEY_log_default="/var/log/mysqld.log"
OCF_RESKEY_pid_default="/var/mysql/mysqld.pid"
OCF_RESKEY_socket_default="/var/run/mysql/mysql.sock"
OCF_RESKEY_test_user_default="root"
OCF_RESKEY_test_table_default="mysql.user"
OCF_RESKEY_test_passwd_default=""
OCF_RESKEY_enable_creation_default=0
OCF_RESKEY_additional_parameters_default=""
else
OCF_RESKEY_binary_default="/usr/bin/safe_mysqld"
OCF_RESKEY_config_default="/etc/my.cnf"
OCF_RESKEY_datadir_default="/var/lib/mysql"
OCF_RESKEY_user_default="mysql"
OCF_RESKEY_group_default="mysql"
OCF_RESKEY_log_default="/var/log/mysqld.log"
OCF_RESKEY_pid_default="/var/run/mysql/mysqld.pid"
OCF_RESKEY_socket_default="/var/lib/mysql/mysql.sock"
OCF_RESKEY_test_user_default="root"
OCF_RESKEY_test_table_default="mysql.user"
OCF_RESKEY_test_passwd_default=""
OCF_RESKEY_enable_creation_default=0
OCF_RESKEY_additional_parameters_default=""
fi

: ${OCF_RESKEY_binary=${OCF_RESKEY_binary_default}}
MYSQL_BINDIR=`dirname ${OCF_RESKEY_binary}`

: ${OCF_RESKEY_config=${OCF_RESKEY_config_default}}
: ${OCF_RESKEY_datadir=${OCF_RESKEY_datadir_default}}

: ${OCF_RESKEY_user=${OCF_RESKEY_user_default}}
: ${OCF_RESKEY_group=${OCF_RESKEY_group_default}}

: ${OCF_RESKEY_log=${OCF_RESKEY_log_default}}
: ${OCF_RESKEY_pid=${OCF_RESKEY_pid_default}}
: ${OCF_RESKEY_socket=${OCF_RESKEY_socket_default}}

: ${OCF_RESKEY_test_user=${OCF_RESKEY_test_user_default}}
: ${OCF_RESKEY_test_table=${OCF_RESKEY_test_table_default}}
: ${OCF_RESKEY_test_passwd=${OCF_RESKEY_test_passwd_default}}

: ${OCF_RESKEY_enable_creation=${OCF_RESKEY_enable_creation_default}}
: ${OCF_RESKEY_additional_parameters=${OCF_RESKEY_additional_parameters_default}}

usage() {
  cat <<UEND
	usage: $0 (start|stop|validate-all|meta-data|monitor)

	$0 manages a MySQL Database as an HA resource.

	The 'start' operation starts the database.
	The 'stop' operation stops the database.
	The 'status' operation reports whether the database is running
	The 'monitor' operation reports whether the database seems to be working
	The 'validate-all' operation reports whether the parameters are valid

UEND
}

meta_data() {
	cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="mysql">
<version>1.0</version>

<longdesc lang="en">
Resource script for MySQL. 
It manages a MySQL Database instance as an HA resource.
</longdesc>
<shortdesc lang="en">MySQL resource agent</shortdesc>

<parameters>

<parameter name="binary" unique="0" required="0">
<longdesc lang="en">
Location of the MySQL binary
</longdesc>
<shortdesc lang="en">MySQL binary</shortdesc>
<content type="string" default="${OCF_RESKEY_binary_default}" />
</parameter>

<parameter name="config" unique="0" required="0">
<longdesc lang="en">
Configuration file
</longdesc>
<shortdesc lang="en">MySQL config</shortdesc>
<content type="string" default="${OCF_RESKEY_config_default}" />
</parameter>

<parameter name="datadir" unique="0" required="0">
<longdesc lang="en">
Directory containing databases
</longdesc>
<shortdesc lang="en">MySQL datadir</shortdesc>
<content type="string" default="${OCF_RESKEY_datadir_default}" />
</parameter>

<parameter name="user" unique="0" required="0">
<longdesc lang="en">
User running MySQL daemon
</longdesc>
<shortdesc lang="en">MySQL user</shortdesc>
<content type="string" default="${OCF_RESKEY_user_default}" />
</parameter>

<parameter name="group" unique="0" required="0">
<longdesc lang="en">
Group running MySQL daemon (for logfile and directory permissions)
</longdesc>
<shortdesc lang="en">MySQL group</shortdesc>
<content type="string" default="${OCF_RESKEY_group_default}"/>
</parameter>

<parameter name="log" unique="0" required="0">
<longdesc lang="en">
The logfile to be used for mysqld.
</longdesc>
<shortdesc lang="en">MySQL log file</shortdesc>
<content type="string" default="${OCF_RESKEY_log_default}"/>
</parameter>

<parameter name="pid" unique="0" required="0">
<longdesc lang="en">
The pidfile to be used for mysqld.
</longdesc>
<shortdesc lang="en">MySQL pid file</shortdesc>
<content type="string" default="${OCF_RESKEY_pid_default}"/>
</parameter>

<parameter name="socket" unique="0" required="0">
<longdesc lang="en">
The socket to be used for mysqld.
</longdesc>
<shortdesc lang="en">MySQL socket</shortdesc>
<content type="string" default="${OCF_RESKEY_pid_default}"/>
</parameter>

<parameter name="test_table" unique="0" required="0">
<longdesc lang="en">
Table to be tested in monitor statement (in database.table notation)
</longdesc>
<shortdesc lang="en">MySQL test table</shortdesc>
<content type="string" default="OCF_RESKEY_test_table_default" />
</parameter>

<parameter name="test_user" unique="0" required="0">
<longdesc lang="en">
MySQL test user
</longdesc>
<shortdesc lang="en">MySQL test user</shortdesc>
<content type="string" default="OCF_RESKEY_test_user_default" />
</parameter>

<parameter name="test_passwd" unique="0" required="0">
<longdesc lang="en">
MySQL test user password
</longdesc>
<shortdesc lang="en">MySQL test user password</shortdesc>
<content type="string" default="${OCF_RESKEY_test_passwd_default}" />
</parameter>

<parameter name="enable_creation" unique="0" required="0">
<longdesc lang="en">
If the MySQL database does not exist, it will be created 
</longdesc>
<shortdesc lang="en">Create the database if it does not exist</shortdesc>
<content type="integer" default="${OCF_RESKEY_enable_creation_default}"/>
</parameter>

<parameter name="additional_parameters" unique="0" required="0">
<longdesc lang="en">
Additional parameters which are passed to the mysqld on startup. 
(e.g. --skip-external-locking or --skip-grant-tables)
</longdesc>
<shortdesc lang="en">Additional paramters to pass to mysqld</shortdesc>
<content type="integer" default="${OCF_RESKEY_additional_parameters_default}"/>
</parameter>

</parameters>

<actions>
<action name="start" timeout="120" />
<action name="stop" timeout="120" />
<action name="status" timeout="60" />
<action name="monitor" depth="0" timeout="30" interval="10" start-delay="10" />
<action name="validate-all" timeout="5" />
<action name="meta-data" timeout="5" />
</actions>
</resource-agent>
END
}

mysql_validate() {
# checking the parameters
    if [ ! -f $OCF_RESKEY_config ]; then
	ocf_log err "Config $OCF_RESKEY_mysql_config doesn't exist";
	exit $OCF_ERR_ARGS;
    fi
    
    if [ ! -d $OCF_RESKEY_datadir ]; then
	ocf_log err "Datadir $OCF_RESKEY_datadir dosen't exist";
	exit $OCF_ERR_ARGS;
    fi
    
    getent passwd $OCF_RESKEY_user >/dev/null 2>&1
    if [ ! $? -eq 0 ]; then
	ocf_log err "User $OCF_RESKEY_user doesn't exit";
	exit $OCF_ERR_ARGS;
    fi
    
    getent group $OCF_RESKEY_group >/dev/null 2>&1
    if [ ! $? -eq 0 ]; then
	ocf_log err "Group $OCF_RESKEY_group doesn't exist";
	exit $OCF_ERR_ARGS;
    fi
}

mysql_status() {
	if [ ! -e $OCF_RESKEY_pid ]; then
		ocf_log debug "MySQL is not running"
		return $OCF_NOT_RUNNING;
	fi
	
	pid=`cat $OCF_RESKEY_pid`;
	if [ -d /proc -a -d /proc/1 ]; then
		[ "u$pid" != "u" -a -d /proc/$pid ]
	else
		kill -0 $pid >/dev/null 2>&1
	fi

	if [ $? -eq 0 ]; then
		return $OCF_SUCCESS;
	else	
		ocf_log debug "MySQL not running: removing old PID file"
		rm -f $OCF_RESKEY_pid
		return $OCF_NOT_RUNNING;
	fi
}

mysql_monitor() {
    mysql_status
    rc=$?

    if [ $OCF_CHECK_LEVEL = 0 -o $rc != 0 ]; then
	return $rc
    fi

    # Do a detailed status check
    buf=`echo "SELECT * FROM $OCF_RESKEY_test_table" | mysql --user=$OCF_RESKEY_test_user --password=$OCF_RESKEY_test_passwd --socket=$OCF_RESKEY_socket -O connect_timeout=1 2>&1`
    rc=$?
    if [ ! $rc -eq 0 ]; then
	ocf_log err "MySQL $test_table monitor failed:";
	if [ ! -z "$buf" ]; then ocf_log err $buf; fi
	return $OCF_ERR_GENERIC;
    else
	ocf_log info "MySQL monitor succeded";
	return $OCF_SUCCESS;
    fi
}

mysql_start() {
    mysql_status
    if [ $? == $OCF_SUCCESS ]; then
	ocf_log info "MySQL already running"
	return $OCF_SUCCESS
    fi
	
    touch $OCF_RESKEY_log
    chown $OCF_RESKEY_user:$OCF_RESKEY_group $OCF_RESKEY_log
    chmod 0640 $OCF_RESKEY_log
    [ -x /sbin/restorecon ] && /sbin/restorecon $OCF_RESKEY_log
    
    if [ $OCF_RESKEY_enable_creation -a ! -d $OCF_RESKEY_datadir/mysql ] ; then	
        ocf_log info "Initializing MySQL database: " 
	$MYSQL_BINDIR/mysql_install_db --datadir=$OCF_RESKEY_datadir
        rc=$?
        if [ $rc -ne 0 ] ; then
	    ocf_log err "Initialization failed: $rc";
            exit $OCF_ERR_GENERIC
        fi
        chown -R $OCF_RESKEY_user:$OCF_RESKEY_group $OCF_RESKEY_datadir
    fi

    # Uncomment to perform permission clensing
    # - not convinced this should be enabled by default
    #
    #chmod 0755 $OCF_RESKEY_datadir
    #chown -R $OCF_RESKEY_user $OCF_RESKEY_datadir
    #chgrp -R $OCF_RESKEY_group $OCF_RESKEY_datadir

    ${OCF_RESKEY_binary}  --defaults-file=$OCF_RESKEY_config --pid-file=$OCF_RESKEY_pid --socket=$OCF_RESKEY_socket --datadir=$OCF_RESKEY_datadir --user=$OCF_RESKEY_user $OCF_RESKEY_additional_parameters >/dev/null 2>&1 &
    rc=$?
    
    if [ $rc != 0 ]; then
	ocf_log err "MySQL start command failed: $rc"
  	return $rc
    fi
    
    # Spin waiting for the server to come up.
    # Let the CRM/LRM time us out if required
    start_wait=1
    while [ $start_wait = 1 ]; do
	mysql_status
	rc=$?
	if [ $rc = $OCF_SUCCESS ]; then
	    start_wait=0

	elif [ $rc != $OCF_NOT_RUNNING ]; then
	    ocf_log info "MySQL start failed: $rc"
	    return $rc
	fi
        sleep 2
    done
    
    ocf_log info "MySQL started"
    return $OCF_SUCCESS
}

mysql_stop() {
    if [ ! -f $OCF_RESKEY_pid ]; then
        return $OCF_SUCCESS
    fi

    pid=`cat $OCF_RESKEY_pid 2> /dev/null `
    /bin/kill $pid > /dev/null 2>&1
    rc=$?
    if [ $rc != 0 ]; then
        ocf_log err "MySQL couldn't be stopped"
	return $OCF_ERR_GENERIC
    fi

    stop_wait=1
    while [ $stop_wait = 1 ]; do
	mysql_status
	rc=$?
	if [ $rc == $OCF_NOT_RUNNING ]; then
	    stop_wait=0
	fi
        sleep 1
    done

    ocf_log info "MySQL stopped";
    rm -f /var/lock/subsys/mysqld
    rm -f $OCF_RESKEY_datadir/mysql.sock
    return $OCF_SUCCESS
}


# What kind of method was invoked?
case "$1" in
  start)	mysql_validate; 
		mysql_start;;
  stop)		mysql_stop;;
  status)	mysql_status;;
  monitor)	mysql_monitor;;

  meta-data)	meta_data; exit $OCF_SUCCESS;;
  validate-all)	mysql_validate; exit $OCF_SUCCESS;;

 *)		usage
		exit $OCF_ERR_UNIMPLEMENTED;;
esac
exit $?

