flowdegrade for ngx_lua or OpenResty

degrade your flow in Ngx_lua or OpenResty on the fly

Brife Intro

This repos is used to DENY or PASS request according to given percent. For example, If request's percent has been set to 90,then 90% of this request will be deny by Nginx.

eg:

server_name/location 		precent
---------------------		-------	
servername1/location1		90
servername2/location2		80
servername3/location3/loc1	100

According to above chart, request servername1/location1 will be droped 90% of it's traffic,and all request prefix with servername1/location1/* will has the same effect.

simple arch

there are two part of this repos: admin and proxy

admin: set/get/del degrade policy from/to redis

proxy: pull degrade policy from redis to nginx worker

depoly

for proxy node

• nginx.conf

init_worker_by_lua_file "/path/to/flowdeg/src/init_worker.lua"  
access_by_lua_file     "/path/to/flowdeg/src/access.lua";

for admin node

http {
	server {
		server_name "your.admin.com";
		location /deg_admin {
			content_by_lua_file "/path/to/flowdeg/src/admin.lua";
		}
	}
}

• NTOTICE!!! redis ip should be changed accordingly in file /path/to/flowdeg/lib/config.lua

API for admin

a.set degrade policy

curl "your.admin.com/deg_admin?action=set" -d '{"host":"server1","uri":"/test1","percent":"80"}' 

b.del policy

curl "your.adim.com/deg_admin?action=del" -d '{"host":"server1","uri":"test1"}'