Add basic IPv6 support and replace haproxy by nginx for VPS failover

luci-app-nginx-ha/LICENSE

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+MIT License
+
+Copyright (c) 2017 chenhw2
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

luci-app-nginx-ha/Makefile

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+#
+# Copyright (C) 2016 chenhw2 <chenhw2@github.com>
+# Copyright (C) 2018 Ycarus (Yannick Chabanois) <ycarus@zugaina.org>
+#
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+LUCI_TITLE:=LuCI Support for nginx load balancing
+LUCI_DEPENDS:=+nginx
+
+PKG_LICENSE:=MIT
+
+include ../luci/luci.mk
+
+# call BuildPackage - OpenWrt buildroot signature

luci-app-nginx-ha/luasrc/controller/nginx-ha.lua

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+module("luci.controller.nginx-ha", package.seeall)
+
+function index()
+  entry(
+    {"admin", "services", "nginx-ha"},
+    cbi("nginx-ha"), _("Nginx High Availability"), 55)
+end

luci-app-nginx-ha/luasrc/model/cbi/nginx-ha.lua

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+local m, s, o
+
+if luci.sys.call("pgrep nginx >/dev/null") == 0 then
+	m = Map("nginx-ha", translate("Nginx High Availability"), "%s - %s" %{translate("Nginx High Availability"), translate("RUNNING")})
+else
+	m = Map("nginx-ha", translate("Nginx High Availability"), "%s - %s" %{translate("Nginx High Availability"), translate("NOT RUNNING")})
+end
+
+s = m:section(TypedSection, "general", translate("General Setting"))
+s.anonymous   = true
+
+o = s:option(Flag, "enable", translate("Enable"))
+o.rmempty     = false
+
+o = s:option(Value, "startup_delay", translate("Startup Delay"))
+o:value(0, translate("Not enabled"))
+for _, v in ipairs({5, 10, 15, 25, 40}) do
+	o:value(v, translate("%u seconds") %{v})
+end
+o.datatype = "uinteger"
+o.default = 0
+o.rmempty = false
+
+o = s:option(Value, "listen", translate("Listen Address:Port"))
+o.placeholder = "0.0.0.0:6666"
+o.default     = "0.0.0.0:6666"
+o.rmempty     = false
+
+o = s:option(Value, "timeout", translate("Timeout Connect (ms)"))
+o.placeholder = "666"
+o.default     = "666"
+o.datatype    = "range(33, 10000)"
+o.rmempty     = false
+
+o = s:option(Value, "retries", translate("Retries"))
+o.placeholder = "1"
+o.default     = "1"
+o.datatype    = "range(1, 10)"
+o.rmempty     = false
+
+
+o = s:option(DynamicList, "upstreams", translate("UpStream Server"), translate("e.g. [123.123.123.123:65101 weight=1 max_fails=3 fail_timeout=30s]"))
+o.placeholder = "123.123.123.123:65101 weight=1 max_fails=3 fail_timeout=30s"
+o.rmempty     = false
+
+return m

luci-app-nginx-ha/root/etc/config/nginx-ha

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+
+config general 'general'
+	option enable '0'
+	option retries '1'
+	option timeout '1000'
+	option listen '0.0.0.0:65101'
+	option startup_delay '5'
+	list upstreams '1.2.3.4:65101 weight=1 max_fails=3 fail_timeout=30s'

luci-app-nginx-ha/root/etc/init.d/nginx-ha

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+#!/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 general "${1}" \
+		'enable:bool:0'            \
+		'retries:uinteger:3'       \
+		'timeout:uinteger:4000'    \
+		'startup_delay:uinteger:5' \
+		'listen:string'            \
+		'upstreams:list(string)'
+}
+
+genline_srv(){
+	echo "    server $1;"
+}
+
+boot() {
+	local delay=$(uci -q get $NAME.general.startup_delay)
+	(sleep ${delay:-0} && start >/dev/null 2>&1) &
+	return 0
+}
+
+start_instance() {
+	local enable retries timeout startup_delay listen upstreams
+
+	validate_section "${1}" || {
+		_err "validation failed"
+		return 1
+	}
+
+	[ "$enable" = 1 ] || return 1
+
+	mkdir -p /var/etc
+	cat <<-EOF > /var/etc/$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 {
+		upstream allservers {
+			zone dynamic 64k;
+			$(config_list_foreach "${1}" "upstreams" genline_srv)
+		}
+	
+		server {
+			listen ${listen:-0.0.0.0:6666} udp;
+			proxy_pass allservers;
+		}
+		server {
+			listen ${listen:-0.0.0.0:6666};
+			proxy_pass allservers;
+		}
+	}
+	EOF
+
+	procd_open_instance "nginx-ha"
+	procd_set_param command /usr/sbin/nginx -c /var/etc/$PROG_NAME.cfg -g 'daemon off;'
+	procd_set_param file /var/etc/$PROG_NAME.cfg
+	procd_set_param respawn
+	procd_close_instance
+}
+
+start_service() {
+	config_load nginx-ha
+	config_foreach start_instance general
+}
+
+reload_service() {
+	stop
+	start
+}
+
+stop_service() {
+	local _PID=$(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
+}

luci-app-nginx-ha/root/etc/uci-defaults/42_luci-nginx-ha

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+#!/bin/sh 
+
+uci -q batch <<-EOF >/dev/null
+	delete ucitrack.@nginx-ha[-1]
+	add ucitrack nginx-ha
+	set ucitrack.@nginx-ha[-1].init=nginx-ha
+	commit ucitrack
+EOF
+
+/etc/init.d/nginx-ha enable >/dev/null 2>&1
+
+rm -f /tmp/luci-indexcache
+exit 0