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#!/bin/sh
JATWIS_MODE=""
JATWIS_LOCKFILE=""
JATWIS_TIMEOUT=10000
JATWIS_FREQUENCY=600
JATWIS_FIRST_RUN=1
JATWIS_SCRIPT_LOCATION=""
JATWIS_URL=""
function poll_default() {
echo "error: no poll handler for \"$JATWIS_MODE\", exiting..."
exit 1
}
JATWIS_POLL_FN=poll_default
function usage() {
cat << EOF
Usage: jatwisd [options]
--help
display (this) help message
-h, --https <https url>
poll url using https
-s, --sftp <sftp url>
poll url using sftp
-e, --exec <path>
script to run if the url is reachable
-t, --timeout <milliseconds>
timeout period (in milliseconds)
default: 10 seconds (10000)
-f, --freq, --frequency <seconds>
polling frequency (in seconds)
default: every 10 minutes (600)
-l, --lockfile <path>
set lockfile location and enable lockfile checking
-p, --no-protection
disable protection agains endpoint success on first run
See jatwisd(1) for more info
EOF
}
function check_ready() {
if [ -z "$JATWIS_URL" ]; then
echo "error: no endpoint to poll, exiting..."
exit 1
elif [ -z "$JATWIS_SCRIPT_LOCATION" ]; then
echo "error: no script or executable specified, exiting..."
exit 1
fi
if [ ! -f "$JATWIS_SCRIPT_LOCATION" ]; then
if [ ! -x "$JATWIS_SCRIPT_LOCATION" ]; then
echo "error: script or executable not executable, exiting..."
exit 1
fi
echo "error: script or executable not found, exiting..."
exit 1
fi
if [ "$JATWIS_MODE" == "HTTPS" ] && [[ "$JATWIS_URL" != https://* ]]; then
echo "error: https url without https:// protocol, exiting..."
exit 1
fi
}
function trigger() {
if [ $JATWIS_FIRST_RUN -eq 1 ]; then
echo "error: poll succeeded on first run, exiting..."
exit 1
fi
sh "$JATWIS_SCRIPT_LOCATION"
}
function poll_https() {
curl -s -o /dev/null -w "%{http_code}" "$JATWIS_URL"
trigger
}
# parse args
while [ "$1" != "" ]; do
case $1 in
--help)
usage
exit
;;
-h|--https)
JATWIS_URL="$2"
JATWIS_MODE="HTTPS"
JATWIS_POLL_FN=poll_https
shift
;;
-s|--sftp)
JATWIS_URL="$2"
JATWIS_MODE="SFTP"
shift
;;
-e|--exec)
JATWIS_SCRIPT_LOCATION="$2"
shift
;;
-t|--timeout)
JATWIS_TIMEOUT="$2"
shift
;;
-f|--freq|--frequency)
JATWIS_FREQUENCY="$2"
shift
;;
-l|--lockfile)
JATWIS_LOCKFILE="$2"
shift
;;
-p|--no-protection)
JATWIS_FIRST_RUN=0
;;
*)
echo "unknown parameter \"$PARAM\""
usage
exit 1
;;
esac
shift
done
check_ready
while :; do
$JATWIS_POLL_FN
JATWIS_FIRST_RUN=0
sleep "$JATWIS_FREQUENCY"
done
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