control

#!/bin/bash

WORKSPACE=$(
    cd "$(dirname "$0")"/ || exit
    pwd
)
cd "$WORKSPACE" || exit

pid_file=app.pid
app_name="stream-server"

function help() {
    echo "$0 help|stop|start|status|restart"
}

function stop() {
    pid=$(cat $pid_file)
    kill -9 "$pid"
    echo "$app_name stopped..."
}

function start() {
    check_pid
    running=$?
    if [ $running -gt 0 ]; then
        echo -n "$app_name now is running already, pid="
        cat $pid_file
        return 1
    fi

    nohup ./stream-server >/dev/null 2>&1 &
    echo $! >$pid_file
    sleep 1
    echo "$app_name starting..."
}

function status() {
    check_pid
    running=$?
    if [ $running -gt 0 ]; then
        echo -n "$app_name now is running, pid="
        cat $pid_file
        echo "app_status:running"
    else
        echo "$app_name is stopped"
        echo "app_status:stopped"
    fi
}

function restart() {
    stop
    sleep 3
    start
}

function check_pid() {
    if [ -f $pid_file ]; then
        pid=$(cat $pid_file)
        if kill -0 "$pid"; then
            return 1
        fi
    fi
    return 0
}

if [ "$1" == "" ]; then
    help
elif [ "$1" == "stop" ]; then
    stop
elif [ "$1" == "start" ]; then
    start
elif [ "$1" == "status" ]; then
    status
elif [ "$1" == "restart" ]; then
    restart
else
    help
fi