substructure_search.initd

#!/bin/bash

### BEGIN INIT INFO
# Provides:          substructure_search
# Required-Start:    $local_fs $network nginx
# Required-Stop:     $local_fs $network
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: starts the substructure search service
# Description:       starts the substructure search service using jsvc
### END INIT INFO

# substructure_search init.d script
#
# Copy or symlink this as /etc/init.d/substructure_search, and link it
# into all /etc/rc{0-6}.d directories as 'S99substructure_search'.
# This can be accomplished conveniently (as root) by running:
#   $ update-rc.d substructure_search defaults 99
# and confirming that S99substructure_search exists in rc{2-5}.d.
#
# The configuration parameters in this script expect Java to have been
# installed using the `install_java` script, expectes `jsvc` to be
# available (installed using apt) and assumes the following files or
# directories exist:
#
# /usr/local/software/wiki_web_services/current.jar:
#   Symlink to most recent version of the wiki services search JAR.
# /etc/wiki_web_services/substructure_config.json:
#   Place the substructure search's configuration file here, and
#   install any data files (like the reachables list) as necessary
#   based on paths therein.
# /var/log/java/:
#   Create a directory here for logs to be written to.  TODO: use log
#   rotation properly.
#
# This script supports common init.d verbs (start|stop|status|reload)
# and will report success or failure both on the consol and through
# its exit code ($?).

java_home="/usr/local/java/current"
user="www-data"
cwd="/tmp"
pid_file="/var/run/substructure.pid"

# Symlink the most recent version of the jar here:
jar="/usr/local/software/wiki_web_services/current.jar"
class="com.twentyn.search.substructure.Service"
args="-c /etc/wiki_web_services/substructure_config.json"

# TODO: replace these with log4j's rolling log appender
stdout="/var/log/java/substructure_search.out"
stderr="/var/log/java/substructure_search.err"

jsvc="/usr/bin/jsvc"
this_script=$0

jsvc_opts="-java-home $java_home -cwd $cwd -cp $jar -user $user -pidfile $pid_file -outfile $stdout -errfile $stderr"

is_running() {
    if [[ -e $pid_file ]]; then
        pid=$(cat $pid_file)
        ps -p $pid >> /dev/null
        result=$?
        return $result
    else
        return 1
    fi
}

start() {
    if is_running; then
        pid=$(cat $pid_file)
        echo "Service is already running with pid $pid"
    else
        echo "Starting service with JSVC..."
        $jsvc $jsvc_opts $class $args
        pid=$(cat $pid_file)
        echo "Service started with pid $pid"
    fi
}

stop() {
    if is_running; then
        echo "Stopping service"
        $jsvc $jsvc_opts -stop $class
    else
        echo "Service is not running"
    fi
}

case "$1" in
    start)
        start
    ;;
    stop)
        stop
    ;;
    status)
        if is_running; then
            echo "Running"
        else
            echo "Stopped"
            exit 1
        fi
    ;;
    restart)
        stop
        start
    ;;
    *)
        echo "Usage: $0 {start|stop|status|restart}"
    ;;
esac

exit 0