#!/bin/bash

### BEGIN INIT INFO
# Provides:          simple-rtmp-server-api(srs-api)
# RequiRED-Start:    $all
# RequiRED-Stop:     $all
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: simple-rtmp-server-api(srs-api)
# Description:       https://github.com/simple-rtmp-server/srs
### END INIT INFO

# the config of ROOT, user must modify it when start srs from other directory,
# it's ok to use the script by command ./etc/init.d/simple-rtmp-server
ROOT="./"
APP="python ./research/api-server/server.py"
CONFIG="8085"

########################################################################
# utility functions
########################################################################
RED="\\033[31m"
GREEN="\\033[32m"
YELLOW="\\033[33m"
BLACK="\\033[0m"
POS="\\033[60G"

ok_msg(){
    echo -e "${1}${POS}${BLACK}[${GREEN}  OK  ${BLACK}]"
}

failed_msg(){
    echo -e "${1}${POS}${BLACK}[${RED}FAILED${BLACK}]"
}

# load process info of srs-api
# @set variable $srs_api_id to the process id.
# @return 0, if process exists; otherwise:
#       1, for srs-api not exists.
# @set variable $error_msg if error.
load_process_info() {
    srs_api_id=`ps aux|grep python|grep research|grep "api-server"|awk '{print $2}'`
    if [[ -z $srs_api_id ]]; then error_msg="srs-api process does not exists"; return 1; fi
    
    return 0;
}

start() {
    # if exists, exit.
    load_process_info
    if [[ 0 -eq $? ]]; then failed_msg "SRS-api started(pid ${srs_api_id}), should not start it again."; return 0; fi
    
    # not exists, start server
    ok_msg "Starting SRS-api..."
    # TODO: FIXME: set limit by, for instance, "ulimit -HSn 10000"
    # TODO: FIXME: write log to, for instance, the same dir of log.
    # TODO: FIXME: support deamon, without nohup.
    (cd ${ROOT}; nohup ${APP} ${CONFIG} >/dev/null 2>&1 &)
    
    # check again after start server
    load_process_info
    ret=$?; if [[ 0 -eq $? ]]; then ok_msg "SRS-api started(pid ${srs_api_id})"; return 0; fi
    
    failed_msg "SRS-api not started"
    return $ret
}

stop() {
    # not start, exit
    load_process_info
    if [[ 0 -ne $? ]]; then failed_msg "SRS-api not start."; return 0; fi
    
    ok_msg "Stopping SRS-api(pid ${srs_api_id})..."
    
    # process exists, kill util stop
    for((;;)); do
        load_process_info
        if [[ 0 -eq $? ]]; then
            kill -s SIGKILL ${srs_api_id} 2>/dev/null
            ret=$?; if [[ 0 -ne $ret ]]; then failed_msg "send signal SIGKILL failed ret=$ret"; return $ret; fi
            sleep 0.1
        else
            ok_msg "SRS-api stopped"
            break;
        fi
    done
    
    sleep 0.1
    return 0
}

# get the status of srs-api process
# @return 0 if srs-api is running; otherwise, 1 for stopped.
status() {
    load_process_info
    ret=$?; if [[ 0 -eq $ret ]]; then echo "SRS-api(pid ${srs_api_id}) is running."; return 0; fi
    
    echo "SRS-api is stopped"
    return 1
}

menu() {
    case "$1" in
        start)
            start
            ;;
        stop)
            stop
            ;;
        restart)
            stop
            start
            ;;
        status)
            status
            ;;
        *)
            echo "Usage: $0 {start|stop|status|restart}"
            return 1
            ;;
    esac
}

menu $1

code=$?
exit ${code}