#!/bin/sh
#
# ocf:pacemaker:Stateful resource agent
#
# Copyright 2006-2021 the Pacemaker project contributors
#
# The version control history for this file may have further details.
#
# This source code is licensed under the GNU General Public License version 2
# or later (GPLv2+) WITHOUT ANY WARRANTY.
#

#
# Example of a stateful OCF Resource Agent
#

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

: ${OCF_FUNCTIONS:="${OCF_ROOT}/resource.d/heartbeat/.ocf-shellfuncs"}
. "${OCF_FUNCTIONS}"
: ${__OCF_ACTION:="$1"}

# Explicitly list all environment variables used, to make static analysis happy
: ${OCF_RESKEY_CRM_meta_interval:=0}
: ${OCF_RESKEY_CRM_meta_globally_unique:="false"}
: ${OCF_RESKEY_notify_delay:=0}
: ${OCF_RESKEY_envfile:=""}
: ${OCF_RESKEY_state:=""}

# Until we can assume the new name is available ...
: ${OCF_RUNNING_PROMOTED:=$OCF_RUNNING_MASTER}

SCORE_UNPROMOTED=5
SCORE_PROMOTED=10

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

meta_data() {
    cat <<END
<?xml version="1.0"?>
<resource-agent name="Stateful" version="1.2">
<version>1.1</version>

<longdesc lang="en">
This is an example resource agent that implements Promoted and Unpromoted roles
</longdesc>
<shortdesc lang="en">Example stateful resource agent</shortdesc>

<parameters>

<parameter name="state" unique-group="state">
<longdesc lang="en">
Location to store the resource state in
</longdesc>
<shortdesc lang="en">State file</shortdesc>
<content type="string" default="${HA_VARRUN%%/}/Stateful-${OCF_RESOURCE_INSTANCE}.state" />
</parameter>

<parameter name="envfile" reloadable="1">
<longdesc lang="en">
If this is set, the environment will be dumped to this file for every call.
</longdesc>
<shortdesc lang="en">Environment dump file</shortdesc>
<content type="string" default="" />
</parameter>

<parameter name="notify_delay" reloadable="1">
<longdesc lang="en">
The notify action will sleep for this many seconds before returning,
to simulate a long-running notify.
</longdesc>
<shortdesc lang="en">Notify delay in seconds</shortdesc>
<content type="string" default="" />
</parameter>

</parameters>

<actions>
<action name="start"   timeout="20s" />
<action name="stop"    timeout="20s" />
<action name="monitor" depth="0" timeout="20s" interval="10s" role="Promoted"/>
<action name="monitor" depth="0" timeout="20s" interval="11s" role="Unpromoted"/>
<action name="promote" timeout="10s" />
<action name="demote"  timeout="10s" />
<action name="notify"  timeout="5s" />
<action name="meta-data"  timeout="5s" />
<action name="reload-agent"  timeout="10s" />
<action name="validate-all"  timeout="30s" />
</actions>
</resource-agent>
END
    exit $OCF_SUCCESS
}

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

stateful_usage() {
    cat <<END
Usage: $0 <action>

where <action> is one of: meta-data validate-all start stop monitor
                          promote demote notify reload-agent

This conforms to the OCF Resource Agent API version 1.1, and expects
to have OCF-compliant environment variables provided.
END
    exit $1
}

stateful_update() {
    echo $1 > "${OCF_RESKEY_state}"
}

stateful_check_state() {
    target="$1"
    if [ -f "${OCF_RESKEY_state}" ]; then
        state=$(cat "${OCF_RESKEY_state}")
        if [ "$target" = "$state" ]; then
            return 0
        fi

    else
        if [ -z "$target" ]; then
            return 0
        fi
    fi

    return 1
}

dump_env() {
    if [ "${OCF_RESKEY_envfile}" != "" ]; then
            echo "### ${__OCF_ACTION} @ $(date) ###
$(env | sort)
###" >> "${OCF_RESKEY_envfile}"
    fi
}

set_promotion_score() {
    "${HA_SBIN_DIR}/crm_attribute" --promotion -v "$1"
}

stateful_start() {
    stateful_check_state Promoted
    if [ $? -eq 0 ]; then
        # CRM Error - Should never happen
        return $OCF_RUNNING_PROMOTED
    fi
    stateful_update Unpromoted
    set_promotion_score $SCORE_UNPROMOTED
    return 0
}

stateful_demote() {
    stateful_check_state
    if [ $? -eq 0 ]; then
        # CRM Error - Should never happen
        return $OCF_NOT_RUNNING
    fi
    stateful_update Unpromoted
    set_promotion_score $SCORE_UNPROMOTED
    return 0
}

stateful_promote() {
    stateful_check_state
    if [ $? -eq 0 ]; then
        return $OCF_NOT_RUNNING
    fi
    stateful_update Promoted
    set_promotion_score $SCORE_PROMOTED
    return 0
}

stateful_stop() {
    "${HA_SBIN_DIR}/crm_attribute" --promotion -D
    stateful_check_state Promoted
    if [ $? -eq 0 ]; then
        # CRM Error - Should never happen
        return $OCF_RUNNING_PROMOTED
    fi
    if [ -f "${OCF_RESKEY_state}" ]; then
        rm "${OCF_RESKEY_state}"
    fi
    return 0
}

stateful_monitor() {
    # for testing
    if [ -f "${OCF_RESKEY_state}.rc" ]; then
        rc=$(cat "${OCF_RESKEY_state}.rc")
        ocf_exit_reason "$rc GB redirected to /dev/null"
        exit $rc
    fi

    stateful_check_state Promoted
    if [ $? -eq 0 ]; then
        if [ $OCF_RESKEY_CRM_meta_interval -eq 0 ]; then
            # Restore the promotion score during probes
            set_promotion_score $SCORE_PROMOTED
        fi
        return $OCF_RUNNING_PROMOTED
    fi

    stateful_check_state Unpromoted
    if [ $? -eq 0 ]; then
        if [ $OCF_RESKEY_CRM_meta_interval -eq 0 ]; then
            # Restore the promotion score during probes
            set_promotion_score $SCORE_UNPROMOTED
        fi
        return $OCF_SUCCESS
    fi

    if [ -f "${OCF_RESKEY_state}" ]; then
        echo "File '${OCF_RESKEY_state}' exists but contains unexpected contents"
        cat "${OCF_RESKEY_state}"
        return $OCF_ERR_GENERIC
    fi
    return 7
}

stateful_notify() {
    if [ "${OCF_RESKEY_notify_delay}" != "0" ]; then
        sleep "${OCF_RESKEY_notify_delay}"
    fi
    return $OCF_SUCCESS
}

stateful_validate() {
    exit $OCF_SUCCESS
}

stateful_reload_agent() {
    return $OCF_SUCCESS
}

if [ -z "$OCF_RESKEY_state" ]; then
    if [ "${OCF_RESKEY_CRM_meta_globally_unique}" = "false" ]; then
        state="${HA_VARRUN%%/}/Stateful-${OCF_RESOURCE_INSTANCE}.state"

        # Strip off the trailing clone marker
        OCF_RESKEY_state=$(echo $state | sed s/:[0-9][0-9]*\.state/.state/)
    else
        OCF_RESKEY_state="${HA_VARRUN%%/}/Stateful-${OCF_RESOURCE_INSTANCE}.state"
    fi
fi

dump_env

case "$__OCF_ACTION" in
meta-data)      meta_data;;
start)          stateful_start;;
promote)        stateful_promote;;
demote)         stateful_demote;;
notify)         stateful_notify ;;
stop)           stateful_stop;;
monitor)        stateful_monitor;;
validate-all)   stateful_validate;;
reload-agent)   stateful_reload_agent;;
usage|help)     stateful_usage $OCF_SUCCESS;;
*)              stateful_usage $OCF_ERR_UNIMPLEMENTED;;
esac

exit $?

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