miniond (for long running minion tasks)

miniond

#!/bin/bash
#
# This script is similar to minion but will do a few additional things:
# - PHP process is run in the background
# - PHP process is monitored and restarted if it exits for any reason
# - Added handlers for SUGHUP, SIGINT, and SIGTERM
#
# This is meant for long running minion tasks (like background workers).
# Shutting down the minion tasks is done by sending a SIGINT or SIGTERM signal
# to this miniond process. You can also restart the minion task by sending a
# SUGHUP signal to this process. It's useful to restart all your workers when
# deploying new code so that the workers reload their code as well.
#
# Usage: ./minion [task:name] [--option1=optval1 --option2=optval2]
#
# And so on.
#
# To get help, pass in --help
#
# # Minion general help
# ./minion --help
# ./minion
#
# # Task specific help
# ./minion task:name --help
#

if [[ $# > 0 && $1 != --* ]]
then
	TASK="--task=$1"
	ARGS=$@
	shift 1
fi

php httpdocs/index.php --uri=minion "$TASK" $ARGS &
# The pid of the php task so we can monitor it
pid=$!

handle_SIGHUP()
{
	echo "Restarting"
	kill -TERM $pid
	# Make sure we wait until the minion task is done before starting a new one
	wait $pid
	# Bring the task back up
	php httpdocs/index.php --uri=minion "$TASK" $ARGS &
	# Store the new pid of the minion task
	pid=$!
}

handle_SIGTERM_SIGINT()
{
	echo "Shutting Down"
	kill -TERM $pid
	# Wait for the task to exit and store the exit code
	wait $pid
	ecode=$?
	# Send the exit code out
	exit "$ecode"
}

trap handle_SIGHUP SIGHUP
trap handle_SIGTERM_SIGINT SIGTERM SIGINT

while :
do
	# Pauses the script until $pid is dead
	wait $pid
	# Make sure someone didn't start it back up already
	if ! kill -0 $pid > /dev/null 2>&1
	then
		# Start the task back up
		php httpdocs/index.php --uri=minion "$TASK" $ARGS &
		pid=$!
	fi
done