#!/bin/sh /etc/rc.common
# Copyright (C) 2016 chenhw2 <chenhw2@github.com>
# Copyright (C) 2018 Ycarus (Yannick Chabanois) <ycarus@zugaina.org>

START=85

USE_PROCD=1
PROG_NAME=nginx
PROG=/usr/sbin/${PROG_NAME}
NAME=nginx-ha

PIDCOUNT=0

_log() {
	logger -p daemon.info -t ${PROG_NAME} "$@"
}

_err() {
	logger -p daemon.err -t ${PROG_NAME} "$@"
}

validate_section() {
	uci_validate_section nginx-ha nginxha "${1}" \
		'enable:bool:0'            \
		'retries:uinteger:3'       \
		'timeout:uinteger:4000'    \
		'listen:string'            \
		'upstreams:list(string)'
}

genline_srv(){
	echo "    server $1;"
}

start_instance() {
	local enable retries timeout startup_delay listen upstreams

	validate_section "${1}" || {
		_err "validation failed"
		return 1
	}

	[ "$enable" = 1 ] || return 1

	stream="${stream}
		upstream ${1} {
			zone dynamic 64k;
			$(config_list_foreach "${1}" "upstreams" genline_srv)
		}
	
		server {
			listen ${listen:-0.0.0.0:6666} udp;
			proxy_pass ${1};
		}
		server {
			listen ${listen:-0.0.0.0:6666};
			proxy_pass ${1};
		}
	"
}

start_service() {
	local stream=""
	config_load nginx-ha
	config_foreach start_instance nginxha

	[ -z "$stream" ] && return
	
	mkdir -p /var/log/nginx
	mkdir -p /var/etc
	cat <<-EOF > /var/etc/$PROG_NAME.cfg
	user nobody nogroup;
	worker_processes $(grep -c '^processor' /proc/cpuinfo | tr -d "\n");
	worker_rlimit_nofile 300000;
	
	events {
		worker_connections 15000;
		multi_accept on;
		use epoll;
	}
	
	stream {
		${stream}
	}
	EOF

	procd_open_instance "nginx-ha"
	procd_set_param command /usr/sbin/nginx -c /var/etc/$PROG_NAME.cfg -g 'daemon off;'
	procd_set_param file /var/etc/$PROG_NAME.cfg
	procd_set_param respawn
	procd_close_instance


}

reload_service() {
	stop
	start
}

stop_service() {
	local _PID=$(cat /var/run/nginx.pid 2>/dev/null)
	kill -15 $_PID 2>/dev/null
	sleep 1                 # give time to shutdown
	local _tmp=$(pgrep nginx | tr "\n" " ")
	if [ -z "$_tmp" ]; then
		logger -p daemon.notice -t "nginx-ha[$_PID]" "Shutdown successfully"
	else
		kill -9 $_tmp   # Normally never come here
		logger -p daemon.warn -t "nginx-ha[$_tmp]" "Shutdown forced by KILL"
	fi
	return 0
}


service_triggers() {
	procd_add_reload_trigger nginx-ha
}