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#!/bin/sh
#
#
# MySQL
#
# Description: Manages a MySQL database as Linux-HA resource
#
# Authors: Alan Robertson: DB2 Script
# Jakub Janczak: rewrite as MySQL
# Andrew Beekhof: cleanup and import
# Sebastian Reitenbach: add OpenBSD defaults, more cleanup
# Narayan Newton: add Gentoo/Debian defaults
# Marian Marinov, Florian Haas: add replication capability
# Yves Trudeau, Baron Schwartz: add VIP support and improve replication
#
# Support: linux-ha@lists.linux-ha.org
# License: GNU General Public License (GPL)
#
# (c) 2002-2005 International Business Machines, Inc.
# 2005-2010 Linux-HA contributors
#
# 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_client_binary
# OCF_RESKEY_config
# OCF_RESKEY_datadir
# OCF_RESKEY_user
# OCF_RESKEY_group
# OCF_RESKEY_test_table
# OCF_RESKEY_test_user
# OCF_RESKEY_test_passwd
# OCF_RESKEY_enable_creation
# OCF_RESKEY_additional_parameters
# OCF_RESKEY_log
# OCF_RESKEY_pid
# OCF_RESKEY_socket
# OCF_RESKEY_replication_user
# OCF_RESKEY_replication_passwd
# OCF_RESKEY_replication_port
# OCF_RESKEY_max_slave_lag
# OCF_RESKEY_evict_outdated_slaves
# OCF_RESKEY_reader_attribute
# OCF_RESKEY_reader_failcount

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

: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat}
. ${OCF_FUNCTIONS_DIR}/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"
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"
fi
OCF_RESKEY_client_binary_default="mysql"
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=""
OCF_RESKEY_replication_port_default="3306"
OCF_RESKEY_max_slave_lag_default="3600"
OCF_RESKEY_evict_outdated_slaves_default="false"
OCF_RESKEY_reader_attribute_default="readable"
OCF_RESKEY_reader_failcount_default="1"


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

: ${OCF_RESKEY_client_binary=${OCF_RESKEY_client_binary_default}}

: ${OCF_RESKEY_config=${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}}

: ${OCF_RESKEY_replication_user=${OCF_RESKEY_replication_user_default}}
: ${OCF_RESKEY_replication_passwd=${OCF_RESKEY_replication_passwd_default}}
: ${OCF_RESKEY_replication_port=${OCF_RESKEY_replication_port_default}}

: ${OCF_RESKEY_max_slave_lag=${OCF_RESKEY_max_slave_lag_default}}
: ${OCF_RESKEY_evict_outdated_slaves=${OCF_RESKEY_evict_outdated_slaves_default}}

: ${OCF_RESKEY_reader_attribute=${OCF_RESKEY_reader_attribute_default}}
: ${OCF_RESKEY_reader_failcount=${OCF_RESKEY_reader_failcount_default}}


#######################################################################
# Convenience variables

MYSQL=$OCF_RESKEY_client_binary

MYSQL_OPTIONS_LOCAL="-A -S $OCF_RESKEY_socket --connect_timeout=10"
MYSQL_OPTIONS_REPL="$MYSQL_OPTIONS_LOCAL --user=$OCF_RESKEY_replication_user --password=$OCF_RESKEY_replication_passwd"
MYSQL_OPTIONS_TEST="$MYSQL_OPTIONS_LOCAL --user=$OCF_RESKEY_test_user --password=$OCF_RESKEY_test_passwd"
MYSQL_TOO_MANY_CONN_ERR=1040

CRM_MASTER="${HA_SBIN_DIR}/crm_master -l reboot "
HOSTNAME=`uname -n`
CRM_ATTR="${HA_SBIN_DIR}/crm_attribute -N $HOSTNAME "
INSTANCE_ATTR_NAME=`echo ${OCF_RESOURCE_INSTANCE}| awk -F : '{print $1}'`
CRM_ATTR_REPL_INFO="${HA_SBIN_DIR}/crm_attribute --type crm_config --name ${INSTANCE_ATTR_NAME}_REPL_INFO -s mysql_replication"
CRM="${HA_SBIN_DIR}/crm"

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

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

$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 'promote' operation makes this mysql server run as master
The 'demote' operation makes this mysql server run as slave
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.
May manage a standalone MySQL database, a clone set with externally
managed replication, or a complete master/slave replication setup.

While managing replication, the default behavior is to use uname -n
values in the change master to command. Other IPs can be specified
manually by adding a node attribute \${INSTANCE_ATTR_NAME}_mysql_master_IP
giving the IP to use for replication. For example, if the mysql primitive
you are using is p_mysql, the attribute to set will be
p_mysql_mysql_master_IP.
</longdesc>
<shortdesc lang="en">Manages a MySQL database instance</shortdesc>
<parameters>

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

<parameter name="client_binary" unique="0" required="0">
<longdesc lang="en">
Location of the MySQL client binary
</longdesc>
<shortdesc lang="en">MySQL client binary</shortdesc>
<content type="string" default="${OCF_RESKEY_client_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_socket_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, must have select privilege on test_table
</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="boolean" 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 parameters to pass to mysqld</shortdesc>
<content type="string" default="${OCF_RESKEY_additional_parameters_default}"/>
</parameter>

<parameter name="replication_user" unique="0" required="0">
<longdesc lang="en">
MySQL replication user. This user is used for starting and stopping
MySQL replication, for setting and resetting the master host, and for
setting and unsetting read-only mode. Because of that, this user must
have SUPER, REPLICATION SLAVE, REPLICATION CLIENT, and PROCESS
privileges on all nodes within the cluster. Mandatory if you define
a master-slave resource.
</longdesc>
<shortdesc lang="en">MySQL replication user</shortdesc>
<content type="string" default="${OCF_RESKEY_replication_user_default}" />
</parameter>

<parameter name="replication_passwd" unique="0" required="0">
<longdesc lang="en">
MySQL replication password. Used for replication client and slave.
Mandatory if you define a master-slave resource.
</longdesc>
<shortdesc lang="en">MySQL replication user password</shortdesc>
<content type="string" default="${OCF_RESKEY_replication_passwd_default}" />
</parameter>

<parameter name="replication_port" unique="0" required="0">
<longdesc lang="en">
The port on which the Master MySQL instance is listening.
</longdesc>
<shortdesc lang="en">MySQL replication port</shortdesc>
<content type="string" default="${OCF_RESKEY_replication_port_default}" />
</parameter>

<parameter name="max_slave_lag" unique="0" required="0">
<longdesc lang="en">
The maximum number of seconds a replication slave is allowed to lag
behind its master. Do not set this to zero. What the cluster manager
does in case a slave exceeds this maximum lag is determined by the
evict_outdated_slaves parameter.
</longdesc>
<shortdesc lang="en">Maximum time (seconds) a MySQL slave is allowed
to lag behind a master</shortdesc>
<content type="integer" default="${OCF_RESKEY_max_slave_lag_default}"/>
</parameter>

<parameter name="evict_outdated_slaves" unique="0" required="0">
<longdesc lang="en">
If set to true, any slave which is more than max_slave_lag seconds
behind the master has its MySQL instance shut down. If this parameter
is set to false in a primitive or clone resource, it is simply
ignored. If set to false in a master/slave resource, then exceeding
the maximum slave lag will merely push down the master preference so
the lagging slave is never promoted to the new master.
</longdesc>
<shortdesc lang="en">Determines whether to shut down badly lagging
slaves</shortdesc>
<content type="boolean" default="${OCF_RESKEY_evict_outdated_slaves_default}" />
</parameter>

<parameter name="reader_attribute" unique="1" required="0">
<longdesc lang="en">
An attribute that the RA can manage to specify whether a node
can be read from. This node attribute will be 1 if it's fine to
read from the node, and 0 otherwise (for example, when a slave
has lagged too far behind the master).

A typical example for the use of this attribute would be to tie
a set of IP addresses to MySQL slaves that can be read from.

This parameter is only meaningful in master/slave set configurations.
</longdesc>
<shortdesc lang="en">Sets the node attribute that determines
whether a node is usable for clients to read from.</shortdesc>
<content type="string" default="${OCF_RESKEY_reader_attribute_default}" />
</parameter>
<parameter name="reader_failcount" unique="1" required="0">
<longdesc lang="en">
The number of times a monitor operation can find the slave
to be unsuitable for reader VIP before failing. Useful if
there are short intermittent issues like clock adjustments in VMs.
</longdesc>
<shortdesc lang="en">Allowed failcount for reader</shortdesc>
<content type="integer" default="${OCF_RESKEY_reader_failcount_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="20" />
<action name="monitor" role="Master" depth="0" timeout="30" interval="10" />
<action name="monitor" role="Slave" depth="0" timeout="30" interval="30" />
<action name="promote" timeout="120" />
<action name="demote" timeout="120" />
<action name="notify" timeout="90" />
<action name="validate-all" timeout="5" />
<action name="meta-data" timeout="5" />
</actions>
</resource-agent>
END
}

# Convenience functions

set_read_only() {
    # Sets or unsets read-only mode. Accepts one boolean as its
    # optional argument. If invoked without any arguments, defaults to
    # enabling read only mode. Should only be set in master/slave
    # setups.
    # Returns $OCF_SUCCESS if the operation succeeds, or
    # $OCF_ERR_GENERIC if it fails.
    local ro_val
    if ocf_is_true $1; then
        ro_val="on"
    else
        ro_val="off"
    fi
    ocf_run $MYSQL $MYSQL_OPTIONS_REPL \
        -e "SET GLOBAL read_only=${ro_val}"
}

get_read_only() {
    # Check if read-only is set
    local read_only_state

    read_only_state=`$MYSQL $MYSQL_OPTIONS_REPL \
        -e "SHOW VARIABLES" | grep read_only | awk '{print $2}'`

    if [ "$read_only_state" = "ON" ]; then
        return 0
    else
        return 1
    fi
}

is_slave() {
    # Determine whether the machine is currently running as a MySQL
    # slave, as determined per SHOW SLAVE STATUS. Returns 1 if SHOW
    # SLAVE STATUS creates an empty result set, 0 otherwise.
    local rc
    local tmpfile

    # Check whether this machine should be slave
    if ! ocf_is_ms || ! get_read_only; then
        return 1
    fi
   
    get_slave_info
    rc=$?

    if [ $rc -eq 0 ]; then
       # show slave status is not empty
       # Is there a master_log_file defined? (master_log_file is deleted
       # by reset slave
       if [ "$master_log_file" ]; then
          return 0
       else
          return 1
       fi
    else
       # "SHOW SLAVE STATUS" returns an empty set if instance is not a
       # replication slave
       return 1
    fi
    
}

parse_slave_info() {
    # Extracts field $1 from result of "SHOW SLAVE STATUS\G" from file $2
    sed -ne "s/^.* $1: \(.*\)$/\1/p" < $2
}

get_slave_info() {

    local mysql_options tmpfile
            
    if [ "$master_log_file" -a "$master_host" ]; then
        # variables are already defined, get_slave_info has been run before
        return $OCF_SUCCESS
    else
        tmpfile=`mktemp ${HA_RSCTMP}/check_slave.${OCF_RESOURCE_INSTANCE}.XXXXXX`

        $MYSQL $MYSQL_OPTIONS_REPL \
        -e 'SHOW SLAVE STATUS\G' > $tmpfile

        if [ -s $tmpfile ]; then
            master_host=`parse_slave_info Master_Host $tmpfile`
            master_user=`parse_slave_info Master_User $tmpfile`
            master_port=`parse_slave_info Master_Port $tmpfile`
            master_log_file=`parse_slave_info Master_Log_File $tmpfile`
            master_log_pos=`parse_slave_info Read_Master_Log_Pos $tmpfile`
            slave_sql=`parse_slave_info Slave_SQL_Running $tmpfile`
            slave_io=`parse_slave_info Slave_IO_Running $tmpfile`
            last_errno=`parse_slave_info Last_Errno $tmpfile`
            secs_behind=`parse_slave_info Seconds_Behind_Master $tmpfile`
            ocf_log debug "MySQL instance has a non empty slave status"
        else
            # Instance produced an empty "SHOW SLAVE STATUS" output --
            # instance is not a slave
            ocf_log err "check_slave invoked on an instance that is not a replication slave."
rm -f $tmpfile
            return $OCF_ERR_GENERIC
        fi
        rm -f $tmpfile
        return $OCF_SUCCESS
    fi
}

check_slave() {
    # Checks slave status
    local rc new_master

    get_slave_info
    rc=$?

    if [ $rc -eq 0 ]; then
        # Did we receive an error other than max_connections?
        if [ $last_errno -ne 0 -a $last_errno -ne "$MYSQL_TOO_MANY_CONN_ERR" ]; then
            # Whoa. Replication ran into an error. This slave has
            # diverged from its master. Make sure this resource
            # doesn't restart in place.
            ocf_log err "MySQL instance configured for replication, but replication has failed."

            # Just pull the reader VIP away, killing MySQL here would be pretty evil
            # on a loaded server
            set_reader_attr 0

            #Since replication is broken, not suitable to be a master
            $CRM_MASTER -v 0

            exit $OCF_SUCCESS

        fi

        # If we got max_connections, let's only remove the vip
        if [ $last_errno -eq "$MYSQL_TOO_MANY_CONN_ERR" ]; then
            set_reader_attr 0
            exit $OCF_SUCCESS
        fi

        if [ "$slave_io" != 'Yes' ]; then
            # Not necessarily a bad thing. The master may have
            # temporarily shut down, and the slave may just be
            # reconnecting. A warning can't hurt, though.
            ocf_log warn "MySQL Slave IO threads currently not running."

            # Sanity check, are we at least on the right master
            new_master=`$CRM_ATTR_REPL_INFO --query -q | cut -d'|' -f1`

            if [ "$master_host" != "$new_master" ]; then
               # Not pointing to the right master, not good, removing the VIPs
               set_reader_attr 0
               exit $OCF_SUCCESS
            fi

        fi

        if [ "$slave_sql" != 'Yes' ]; then
            # We don't have a replication SQL thread running. Not a
            # good thing. Try to recoved by restarting the SQL thread
            # and remove reader vip. Prevent MySQL restart.
            ocf_log err "MySQL Slave SQL threads currently not running."

            # Remove reader vip
            set_reader_attr 0
            $CRM_MASTER -v 0

            # try to restart slave
            ocf_run $MYSQL $MYSQL_OPTIONS_REPL \
                -e "START SLAVE"

            # Return success to prevent a restart
            exit $OCF_SUCCESS
        fi

        if ocf_is_true $OCF_RESKEY_evict_outdated_slaves; then
            # We're supposed to bail out if we lag too far
            # behind. Let's check our lag.
            if [ $secs_behind -gt $OCF_RESKEY_max_slave_lag ]; then
                ocf_log err "MySQL Slave is $secs_behind seconds behind master (allowed maximum: $OCF_RESKEY_max_slave_lag)."

                # Remove reader vip
                set_reader_attr 0

                exit $OCF_ERR_INSTALLED
            fi
            elif ocf_is_ms; then
            # Even if we're not set to evict lagging slaves, we can
            # still use the seconds behind master value to set our
            # master preference.
            local master_pref
            master_pref=$((${OCF_RESKEY_max_slave_lag}-${secs_behind}))
            if [ $master_pref -lt 0 ]; then
                # Sanitize a below-zero preference to just zero
                master_pref=0
            fi
            $CRM_MASTER -v $master_pref
        fi

        # is the slave ok to have a VIP on it
        test $secs_behind -eq 0 2>/dev/null
        if [ $? -eq 2 ]; then
            set_reader_attr 0
        else
            if [ $secs_behind -gt $OCF_RESKEY_max_slave_lag ]; then
                set_reader_attr 0
            else
                set_reader_attr 1
            fi
        fi

        ocf_log debug "MySQL instance running as a replication slave"
    else
        # Instance produced an empty "SHOW SLAVE STATUS" output --
        # instance is not a slave
        # TODO: Needs to handle when get_slave_info will return too many connections error
        ocf_log err "check_slave invoked on an instance that is not a replication slave."
        exit $OCF_ERR_GENERIC
    fi
}

set_master() {
    local new_master master_log_file master_log_pos
    local master_params

    new_master=`$CRM_ATTR_REPL_INFO --query -q | cut -d'|' -f1`

    # Keep replication position
    get_slave_info

    if [ "$master_log_file" -a "$new_master" = "$master_host" ]; then
        # master_params=", MASTER_LOG_FILE='$master_log_file', \
        # MASTER_LOG_POS=$master_log_pos"
        ocf_log info "Kept master pos for $master_host : $master_log_file:$master_log_pos"
        return
    else
        master_log_file=`$CRM_ATTR_REPL_INFO --query -q | cut -d'|' -f2`
        master_log_pos=`$CRM_ATTR_REPL_INFO --query -q | cut -d'|' -f3`
        if [ -n "$master_log_file" -a -n "$master_log_pos" ]; then
            master_params=", MASTER_LOG_FILE='$master_log_file', \
MASTER_LOG_POS=$master_log_pos"
            ocf_log info "Restored master pos for $new_master : $master_log_file:$master_log_pos"
        fi
    fi

    # Informs the MySQL server of the master to replicate
    # from. Accepts one mandatory argument which must contain the host
    # name of the new master host. The master must either be unchanged
    # from the laste master the slave replicated from, or freshly
    # reset with RESET MASTER.

    ocf_run $MYSQL $MYSQL_OPTIONS_REPL \
        -e "STOP SLAVE;CHANGE MASTER TO MASTER_HOST='$new_master', \
MASTER_USER='$OCF_RESKEY_replication_user', \
MASTER_PASSWORD='$OCF_RESKEY_replication_passwd' $master_params"
}

unset_master(){
    # Instructs the MySQL server to stop replicating from a master
    # host.

    # If we're currently not configured to be replicating from any
    # host, then there's nothing to do. But we do log a warning as
    # no-one but the CRM should be touching the MySQL master/slave
    # configuration.

    is_slave
    rc=$?
    if [ $rc -ne 0 ]; then
        ocf_log warn "Attempted to unset the replication master on an instance that is not configured as a replication slave"
        return $OCF_SUCCESS
    fi

    local tmpfile
    tmpfile=`mktemp ${HA_RSCTMP}/unset_master.${OCF_RESOURCE_INSTANCE}.XXXXXX`

    # At this point, the master is read only so there should not be much binlogs to transfer
    # Let's wait for the last bits
    while true; do
        $MYSQL $MYSQL_OPTIONS_REPL \
        -e 'SHOW PROCESSLIST\G' > $tmpfile
        if grep -i 'Waiting for master to send event' $tmpfile >/dev/null; then
            ocf_log info "MySQL slave has finished reading master binary log"
            break
fi
        if grep -i 'Reconnecting after a failed master event read' $tmpfile >/dev/null; then
            ocf_log info "Master is down, no more binary logs to come"
            break
fi
        if grep -i 'Connecting to master' $tmpfile >/dev/null; then
            ocf_log info "Master is down, no more binary logs to come"
            break
fi
        if ! grep 'system user' $tmpfile >/dev/null; then
            ocf_log info "Slave is not running - not waiting to finish"
            break
fi

        sleep 1
    done

    # Now, stop the slave I/O thread and wait for relay log
    # processing to complete
    ocf_run $MYSQL $MYSQL_OPTIONS_REPL \
        -e "STOP SLAVE IO_THREAD"
    if [ $? -gt 0 ]; then
        ocf_log err "Error stopping slave IO thread"
        rm -f $tmpfile
        exit $OCF_ERR_GENERIC
    fi

    while true; do
        $MYSQL $MYSQL_OPTIONS_REPL \
            -e 'SHOW PROCESSLIST\G' > $tmpfile
        if grep -i 'Has read all relay log' $tmpfile >/dev/null; then
            ocf_log info "MySQL slave has finished processing relay log"
            break
fi
        if ! grep -q 'system user' $tmpfile; then
            ocf_log info "Slave not runnig - not waiting to finish"
            break
fi
        ocf_log info "Waiting for MySQL slave to finish processing relay log"
        sleep 1
    done
    rm -f $tmpfile

    # Now, stop all slave activity and unset the master host
    ocf_run $MYSQL $MYSQL_OPTIONS_REPL \
        -e "STOP SLAVE"
    if [ $? -gt 0 ]; then
        ocf_log err "Error stopping rest slave threads"
        exit $OCF_ERR_GENERIC
    fi

    ocf_run $MYSQL $MYSQL_OPTIONS_REPL \
        -e "RESET SLAVE /*!50516 ALL */;"
    if [ $? -gt 0 ]; then
        ocf_log err "Failed to reset slave"
        exit $OCF_ERR_GENERIC
    fi
}

# Start replication as slave
start_slave() {
    ocf_run $MYSQL $MYSQL_OPTIONS_REPL \
        -e "START SLAVE"
}

# Set the attribute controlling the readers VIP
set_reader_attr() {
    local curr_attr_value

    curr_attr_value=$(get_reader_attr)
    
    if [ "$1" -eq "0" ]; then
        if [ "$curr_attr_value" -gt "0" ]; then
            curr_attr_value=$((${curr_attr_value}-1))
            $CRM_ATTR -l reboot --name ${OCF_RESKEY_reader_attribute} -v $curr_attr_value
        else
            $CRM_ATTR -l reboot --name ${OCF_RESKEY_reader_attribute} -v 0
        fi
    else
        if [ "$curr_attr_value" -ne "$OCF_RESKEY_reader_failcount" ]; then
            $CRM_ATTR -l reboot --name ${OCF_RESKEY_reader_attribute} -v $OCF_RESKEY_reader_failcount
        fi
    fi

}

# get the attribute controlling the readers VIP
get_reader_attr() {
    local attr_value
    local rc

    attr_value=`$CRM_ATTR -l reboot --name ${OCF_RESKEY_reader_attribute} --query -q`
    rc=$?
    if [ "$rc" -eq "0" ]; then
        echo $attr_value
    else
        echo -1
    fi

}

# Stores data for MASTER STATUS from MySQL
update_data_master_status() {

   master_status_file="${HA_RSCTMP}/master_status.${OCF_RESOURCE_INSTANCE}"

   $MYSQL $MYSQL_OPTIONS_REPL -e "SHOW MASTER STATUS\G" > $master_status_file
}


# Returns the specified value from the stored copy of SHOW MASTER STATUS.
# should be call after update_data_master_status for tmpfile
# Arguments:
# $1 The value to get.
get_master_status() {
   awk -v var="$1" '$1 == var ":" {print substr($0, index($0, ":") + 2)}' "$master_status_file"
}


# Determines what IP address is attached to the current host. The output of the
# crm_attribute command looks like this:
# scope=nodes name=IP value=10.2.2.161
# If the ${INSTANCE_ATTR_NAME}_MYSQL_MASTER_IP node attribute is not defined, fallback is to uname -n
# The ${INSTANCE_ATTR_NAME}_MYSQL_MASTER_IP is the IP address that will be used for the
# change master to command.
get_local_ip() {
   local IP
   IP=`$CRM_ATTR -l forever -n ${INSTANCE_ATTR_NAME}_mysql_master_IP -q -G`
   if [ ! $? -eq 0 ]; then
      uname -n
   else
      echo $IP
   fi
}

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

# Functions invoked by resource manager actions

mysql_validate() {
    check_binary $OCF_RESKEY_binary
    check_binary $OCF_RESKEY_client_binary

    if [ ! -f $OCF_RESKEY_config ]; then
        ocf_log err "Config $OCF_RESKEY_config doesn't exist";
        return $OCF_ERR_INSTALLED;
    fi

    if [ ! -d $OCF_RESKEY_datadir ]; then
        ocf_log err "Datadir $OCF_RESKEY_datadir doesn't exist";
        return $OCF_ERR_INSTALLED;
    fi

    getent passwd $OCF_RESKEY_user >/dev/null 2>&1
    if [ ! $? -eq 0 ]; then
        ocf_log err "User $OCF_RESKEY_user doesn't exit";
        return $OCF_ERR_INSTALLED;
    fi

    getent group $OCF_RESKEY_group >/dev/null 2>&1
    if [ ! $? -eq 0 ]; then
        ocf_log err "Group $OCF_RESKEY_group doesn't exist";
        return $OCF_ERR_INSTALLED;
    fi

    true
}

mysql_status() {
    if [ ! -e $OCF_RESKEY_pid ]; then
        ocf_log $1 "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 -s 0 $pid >/dev/null 2>&1
    fi

    if [ $? -eq 0 ]; then
        return $OCF_SUCCESS;
    else
        ocf_log $1 "MySQL not running: removing old PID file"
        rm -f $OCF_RESKEY_pid
        return $OCF_NOT_RUNNING;
    fi
}

mysql_monitor() {
    local rc
    local status_loglevel="err"
    local master_resource
    local master_exists

    # Set loglevel to info during probe
    if ocf_is_probe; then
        status_loglevel="info"
    fi
 
    mysql_status $status_loglevel

    rc=$?

    # TODO: check max connections error

    # If status returned an error, return that immediately
    if [ $rc -ne $OCF_SUCCESS ]; then
        return $rc
    fi


    if [ $OCF_CHECK_LEVEL -gt 0 -a -n "$OCF_RESKEY_test_table" ]; then
        # Check if this instance is configured as a slave, and if so
        # check slave status
        
master_resource=`$CRM resource list | grep p_mysql | awk '{print $3}' | head -n 1`
master_exists=`$CRM resource list $master_resource | egrep -c 'Master$'`
        # Are we currently having a master?
        if [ "$master_exists" -ne "0" ]; then
            is_slave
            rc=$?
            if [ $rc -eq 0 -o "$OCF_RESKEY_CRM_meta_role" = "Slave" ]; then
                check_slave
            fi
        fi

        # Check for test table
        ocf_run -q $MYSQL $MYSQL_OPTIONS_TEST \
            -e "SELECT COUNT(*) FROM $OCF_RESKEY_test_table"
        rc=$?

        if [ $rc -ne "$MYSQL_TOO_MANY_CONN_ERR" ]; then
            if [ $rc -ne 0 ]; then
                ocf_log err "Failed to select from $test_table";
                return $OCF_ERR_GENERIC;
            fi
        else
            ocf_log info "Master hit max_connections"
        fi
    fi

    if ocf_is_ms && ! get_read_only; then
        ocf_log debug "MySQL monitor succeeded (master)";
        return $OCF_RUNNING_MASTER
    else
        ocf_log debug "MySQL monitor succeeded";
        return $OCF_SUCCESS
    fi
}

mysql_start() {
    if ocf_is_ms; then
        # Initialize the ReaderVIP attribute, monitor will enable it
        set_reader_attr 0

        # set master_score to 0 in case mysql crashes on startup
        $CRM_MASTER -v 0

    fi

    mysql_status info
    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_is_true "$OCF_RESKEY_enable_creation" && [ ! -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

    pid_dir=`dirname $OCF_RESKEY_pid`
    if [ ! -d $pid_dir ] ; then
        ocf_log info "Creating PID dir: $pid_dir"
        mkdir -p $pid_dir
        chown $OCF_RESKEY_user:$OCF_RESKEY_group $pid_dir
    fi

    socket_dir=`dirname $OCF_RESKEY_socket`
    if [ ! -d $socket_dir ] ; then
        ocf_log info "Creating socket dir: $socket_dir"
        mkdir -p $socket_dir
        chown $OCF_RESKEY_user:$OCF_RESKEY_group $socket_dir
    fi

    # Regardless of whether we just created the directory or it
    # already existed, check whether it is writable by the configured
    # user
    for dir in $pid_dir $socket_dir; do
        if ! su -s /bin/sh - $OCF_RESKEY_user -c "test -w $dir"; then
            ocf_log err "Directory $dir is not writable by $OCF_RESKEY_user"
            exit $OCF_ERR_PERM;
        fi
    done

    # 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 $OCF_RESKEY_datadir
    mysql_extra_params=
    if ocf_is_ms; then
        mysql_extra_params="$mysql_extra_params --skip-slave-start --read-only"
    fi

    ${OCF_RESKEY_binary} --defaults-file=$OCF_RESKEY_config \
    --pid-file=$OCF_RESKEY_pid \
    --socket=$OCF_RESKEY_socket \
    --datadir=$OCF_RESKEY_datadir \
    --user=$OCF_RESKEY_user $OCF_RESKEY_additional_parameters \
    $mysql_extra_params >/dev/null 2>&1 &
    rc=$?

    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 [ $start_wait = 1 ]; do
        mysql_status info
        rc=$?
        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

    if ocf_is_ms; then
        # We're configured as a stateful resource. We must start as
        # slave by default. At this point we don't know if the CRM has
        # already promoted a master. So, we simply start in read only
        # mode. Should already be from command line.
        set_read_only on

        # Now, let's see whether there is a master. We might be a new
        # node that is just joining the cluster, and the CRM may have
        # promoted a master before.
        master_host=`echo $OCF_RESKEY_CRM_meta_notify_master_uname|tr -d " "`
        if [ "$master_host" -a "$master_host" != ${HOSTNAME} ]; then
            ocf_log info "Changing MySQL configuration to replicate from $master_host."
            set_master
            start_slave
            if [ $? -ne 0 ]; then
                ocf_log err "Failed to start slave"
                return $OCF_ERR_GENERIC
            fi
        else
            ocf_log info "No MySQL master present - clearing replication state"
            unset_master
        fi

        # We also need to set a master preference, otherwise Pacemaker
        # won't ever promote us in the absence of any explicit
        # preference set by the administrator. We choose a low
        # greater-than-zero preference.
        $CRM_MASTER -v 1

    fi

    # Initial monitor action
    if [ -n "$OCF_RESKEY_test_table" -a -n "$OCF_RESKEY_test_user" -a -n "$OCF_RESKEY_test_passwd" ]; then
        OCF_CHECK_LEVEL=10
    fi
    mysql_monitor
    rc=$?
    if [ $rc != $OCF_SUCCESS -a $rc != $OCF_RUNNING_MASTER ]; then
        ocf_log err "Failed initial monitor action"
        return $rc
    fi

    ocf_log info "MySQL started"
    return $OCF_SUCCESS
}

mysql_stop() {

    if ocf_is_ms; then
        # clear preference for becoming master
        $CRM_MASTER -D

        # Remove VIP capability
        set_reader_attr 0
    fi

    if [ ! -f $OCF_RESKEY_pid ]; then
        ocf_log info "MySQL is not running"
        return $OCF_SUCCESS
    fi

    pid=`cat $OCF_RESKEY_pid 2> /dev/null `
    /bin/kill $pid > /dev/null
    rc=$?
    if [ $rc != 0 ]; then
        ocf_log err "MySQL couldn't be stopped"
        return $OCF_ERR_GENERIC
    fi
    # stop waiting
    shutdown_timeout=15
    if [ -n "$OCF_RESKEY_CRM_meta_timeout" ]; then
        shutdown_timeout=$((($OCF_RESKEY_CRM_meta_timeout/1000)-5))
    fi
    count=0
    while [ $count -lt $shutdown_timeout ]
    do
        mysql_status info
        rc=$?
        if [ $rc = $OCF_NOT_RUNNING ]; then
            break
fi
        count=`expr $count + 1`
        sleep 1
        ocf_log debug "MySQL still hasn't stopped yet. Waiting..."
    done

    mysql_status info
    if [ $? != $OCF_NOT_RUNNING ]; then
        ocf_log info "MySQL failed to stop after ${shutdown_timeout}s using SIGTERM. Trying SIGKILL..."
        /bin/kill -KILL $pid > /dev/null
    fi

    ocf_log info "MySQL stopped";
    rm -f /var/lock/subsys/mysqld
    rm -f $OCF_RESKEY_socket
    return $OCF_SUCCESS
}

mysql_promote() {
    local master_info

    if ( ! mysql_status err ); then
        return $OCF_NOT_RUNNING
    fi

    unset_master


    # Set Master Info in CIB, cluster level attribute
    update_data_master_status
    master_info="$(get_local_ip)|$(get_master_status File)|$(get_master_status Position)"
    ${CRM_ATTR_REPL_INFO} -v "$master_info"
    rm -f $tmpfile

    set_read_only off || return $OCF_ERR_GENERIC

    # Existing master gets a higher-than-default master preference, so
    # the cluster manager does not shuffle the master role around
    # unnecessarily
    $CRM_MASTER -v $((${OCF_RESKEY_max_slave_lag}+1000))

    # A master can accept reads
    set_reader_attr 1

    # A master can accept reads
    set_reader_attr 1

    return $OCF_SUCCESS
}

mysql_demote() {
    if ! mysql_status err; then
        $CRM_MASTER -v 0
    else
        # Return master preference to default, so the cluster manager gets
        # a chance to select a new master
        $CRM_MASTER -v 1
    fi
}

mysql_notify() {
    # If not configured as a Stateful resource, we make no sense of
    # notifications.
    if ! ocf_is_ms; then
        ocf_log info "This agent makes no use of notifications unless running in master/slave mode."
        return $OCF_SUCCESS
    fi

    local type_op
    type_op="${OCF_RESKEY_CRM_meta_notify_type}-${OCF_RESKEY_CRM_meta_notify_operation}"

    ocf_log debug "Received $type_op notification."

    case "$type_op" in
        'pre-promote')
            # Nothing to do now here, new replication info not yet published

        ;;
        'post-promote')
            # The master has completed its promotion. Now is a good
            # time to check whether our replication slave is working
            # correctly.

            # Is the notification for our set
            notify_resource=`echo $OCF_RESKEY_CRM_meta_notify_promote_resource|cut -d: -f1`
            my_resource=`echo $OCF_RESOURCE_INSTANCE|cut -d: -f1`
            if [ $notify_resource != ${my_resource} ]; then
                ocf_log debug "Notification is not for us"
                return $OCF_SUCCESS
            fi

            master_host=`echo $OCF_RESKEY_CRM_meta_notify_promote_uname|tr -d " "`
            if [ "$master_host" = ${HOSTNAME} ]; then
                ocf_log info "This will be the new master, ignoring post-promote notification."
            else
                ocf_log info "Resetting replication"
                unset_master
                if [ $? -ne 0 ]; then
                    return $OCF_ERR_GENERIC
                fi

                ocf_log info "Changing MySQL configuration to replicate from $master_host"
                set_master
                if [ $? -ne 0 ]; then
                    return $OCF_ERR_GENERIC
                fi

                start_slave
                if [ $? -ne 0 ]; then
                    ocf_log err "Failed to start slave"
                    return $OCF_ERR_GENERIC
                fi
            fi
            return $OCF_SUCCESS
        ;;
        'pre-demote')
            # Is the notification for our set
            notify_resource=`echo $OCF_RESKEY_CRM_meta_notify_demote_resource|cut -d: -f1`
            my_resource=`echo $OCF_RESOURCE_INSTANCE|cut -d: -f1`
            if [ $notify_resource != ${my_resource} ]; then
                ocf_log debug "Notification is not for us"
                return $OCF_SUCCESS
            fi

            demote_host=`echo $OCF_RESKEY_CRM_meta_notify_demote_uname|tr -d " "`
            if [ $demote_host = ${HOSTNAME} ]; then
                ocf_log info "post-demote notification for $demote_host"
                set_read_only on
                if [ $? -ne 0 ]; then
                    ocf_log err "Failed to set read-only";
                    return $OCF_ERR_GENERIC;
                fi

                # Must kill all existing user threads because they are still Read/write
                # in order for the slaves to complete the read of binlogs
                local tmpfile
                tmpfile=`mktemp ${HA_RSCTMP}/threads.${OCF_RESOURCE_INSTANCE}.XXXXXX`
                $MYSQL $MYSQL_OPTIONS_REPL \
                -e "SHOW PROCESSLIST" > $tmpfile

                for thread in `awk '$0 !~ /Binlog Dump|system user|event_scheduler|SHOW PROCESSLIST/ && $0 ~ /^[0-9]/ {print $1}' $tmpfile`
                do
                    ocf_run $MYSQL $MYSQL_OPTIONS_REPL \
                        -e "KILL ${thread}"
                done
                rm -f $tmpfile
            else
               ocf_log info "Ignoring post-demote notification execpt for my own demotion."
            fi
            return $OCF_SUCCESS
        ;;
        'post-demote')
            # Is the notification for our set
            notify_resource=`echo $OCF_RESKEY_CRM_meta_notify_demote_resource|cut -d: -f1`
            my_resource=`echo $OCF_RESOURCE_INSTANCE|cut -d: -f1`
            if [ $notify_resource != ${my_resource} ]; then
                ocf_log debug "Notification is not for us"
                return $OCF_SUCCESS
            fi

            demote_host=`echo $OCF_RESKEY_CRM_meta_notify_demote_uname|tr -d " "`
            if [ $demote_host = ${HOSTNAME} ]; then
               ocf_log info "Ignoring post-demote notification for my own demotion."
               return $OCF_SUCCESS
            fi
            ocf_log info "post-demote notification for $demote_host."
            # The former master has just been gracefully demoted.
            unset_master
        ;;
        *)
            return $OCF_SUCCESS
        ;;
    esac
}

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


##########################################################################
# If DEBUG_LOG is set, make this resource agent easy to debug: set up the
# debug log and direct all output to it. Otherwise, redirect to /dev/null.
# The log directory must be a directory owned by root, with permissions 0700,
# and the log must be writable and not a symlink.
##########################################################################
DEBUG_LOG="/tmp/mysql.ocf.ra.debug/log"
if [ "${DEBUG_LOG}" -a -w "${DEBUG_LOG}" -a ! -L "${DEBUG_LOG}" ]; then
    DEBUG_LOG_DIR="${DEBUG_LOG%/*}"
    if [ -d "${DEBUG_LOG_DIR}" ]; then
        exec 9>>"$DEBUG_LOG"
        exec 2>&9
        date >&9
        echo "$*" >&9
        env | grep OCF_ | sort >&9
        set -x
    else
        exec 9>/dev/null
    fi
fi

case "$1" in
  meta-data) meta_data
        exit $OCF_SUCCESS;;
  usage|help) usage
        exit $OCF_SUCCESS;;
esac

mysql_validate
rc=$?
LSB_STATUS_STOPPED=3
if [ $rc -ne 0 ]; then
    case "$1" in
        stop) exit $OCF_SUCCESS;;
        monitor) exit $OCF_NOT_RUNNING;;
        status) exit $LSB_STATUS_STOPPED;;
        *) exit $rc;;
    esac
fi

# What kind of method was invoked?
case "$1" in
  start) mysql_start;;
  stop) mysql_stop;;
  status) mysql_status err;;
  monitor) mysql_monitor;;
  promote) mysql_promote;;
  demote) mysql_demote;;
  notify) mysql_notify;;
  validate-all) exit $OCF_SUCCESS;;

 *) usage
        exit $OCF_ERR_UNIMPLEMENTED;;
esac
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