File: init

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mtail 3.0.0~rc24.1-1
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#!/bin/sh
# kFreeBSD do not accept scripts as interpreters, using #!/bin/sh and sourcing.
if [ true != "$INIT_D_SCRIPT_SOURCED" ] ; then
    set "$0" "$@"; INIT_D_SCRIPT_SOURCED=true . /lib/init/init-d-script
fi
### BEGIN INIT INFO
# Provides:          mtail
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Extract monitoring data from logs
# Description:       mtail is a tool for extracting metrics from application
#                    logs to be exported into a timeseries database or
#                    timeseries calculator for alerting and dashboarding.
#                    It aims to fill a niche between applications that do not
#                    export their own internal state, and existing monitoring
#                    systems, without patching those applications or rewriting
#                    the same framework for custom extraction glue code.
#                    Metrics are exported for scraping by a collector as JSON
#                    or Prometheus format over HTTP, or can be periodically
#                    sent to a collectd, StatsD, or Graphite collector socket.
### END INIT INFO

# Author: Martín Ferrari <tincho@debian.org>

DESC="monitoring data extractor from application logs"
DAEMON=/usr/bin/mtail
NAME=mtail
USER=mtail
PIDFILE=/var/run/mtail/mtail.pid
LOGFILE=/var/log/mtail/mtail.log

HELPER=/usr/bin/daemon
HELPER_ARGS="--name=$NAME --output=$LOGFILE --pidfile=$PIDFILE --user=$USER"

# Defaults.
ENABLED=0
LOGS=
PORT=
COLLECTD_SOCKETPATH=
GRAPHITE_HOST_PORT=
STATSD_HOSTPORT=
METRIC_PUSH_INTERVAL=
EXTRA_ARGS=

[ -r /etc/default/$NAME ] && . /etc/default/$NAME
if [ -z "$ENABLED" -o "$ENABLED" = "0" -o "$ENABLED" = "no" ] ; then
    echo "$NAME disabled, see /etc/default/$NAME"
    exit 0
fi

ARGS="-progs /etc/mtail -logtostderr"
[ -n "$LOGS" ] && ARGS="${ARGS} -logs $LOGS"
[ -n "$PORT" ] && ARGS="${ARGS} -port $PORT"
[ -n "$COLLECTD_SOCKETPATH" ] && \
    ARGS="${ARGS} -collectd_socketpath $COLLECTD_SOCKETPATH"
[ -n "$GRAPHITE_HOSTPORT" ] && \
    ARGS="${ARGS} -graphite_host_port $GRAPHITE_HOSTPORT"
[ -n "$STATSD_HOSTPORT" ] && ARGS="${ARGS} -statsd_hostport $STATSD_HOSTPORT"
[ -n "$METRIC_PUSH_INTERVAL" ] && \
    ARGS="${ARGS} -metric_push_interval_seconds $METRIC_PUSH_INTERVAL"
[ -n "$EXTRA_ARGS" ] && ARGS="${ARGS} $EXTRA_ARGS"

do_start_prepare()
{
    mkdir -p `dirname $PIDFILE` || true
    chown -R $USER: `dirname $LOGFILE`
    chown -R $USER: `dirname $PIDFILE`
}

do_start_cmd()
{
    # Return
    #   0 if daemon has been started
    #   1 if daemon was already running
    #   2 if daemon could not be started
    $HELPER $HELPER_ARGS --running && return 1
    $HELPER $HELPER_ARGS -- $DAEMON $ARGS || return 2
    return 0
}

do_stop_cmd()
{
    # Return
    #   0 if daemon has been stopped
    #   1 if daemon was already stopped
    #   2 if daemon could not be stopped
    #   other if a failure occurred
    $HELPER $HELPER_ARGS --running || return 1
    $HELPER $HELPER_ARGS --stop || return 2
    # wait for the process to really terminate
    for n in 1 2 3 4 5; do
        sleep $n
        $HELPER $HELPER_ARGS --running || break
    done
    $HELPER $HELPER_ARGS --running || return 0
    return 2
}