利用nginx+lua+redis实现反向代理方法教程

server {

 server_name ivr.com;            
 access_log /home/work/log/nginx/access.ivr.log;
 error_log /home/work/log/nginx/error.ivr.log;

 proxy_set_header Host $http_host;
 proxy_set_header X-Forwarded-Port $server_port;
 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 proxy_set_header X-Forwarded-Proto $scheme;
 proxy_set_header X-Forwarded-Protocol $scheme;
 proxy_set_header X-Real-IP $remote_addr;
 proxy_read_timeout 30; 
 proxy_connect_timeout 10; 


 location /ivr/ {
 lua_code_cache off;
 resolver 8.8.8.8;
 set $backend ''; 
 rewrite_by_lua_file /home/work/tengine-2.1.0/conf/lua/ivr.lua;
 proxy_pass http://$backend;
 } 
} 

local redis = require "resty.redis"
local cjson = require "cjson"
local cache = redis.new()
cache.connect(cache, '127.0.0.1', '6379')

local args = ngx.req.get_uri_args()
local uri = ngx.var.request_uri

local callid = nil
local channel = 0

if string.find(uri, 'yuntongxun') then
 callid = args["callid"]
 channel = 0
elseif string.find(uri, 'yunhu') then
 ngx.req.read_body()
 local body_data = ngx.req.get_body_data()
 local data = cjson.decode(body_data)
 callid = data['call_id']
 channel = 1
elseif string.find(uri, 'huawei') then
 callid = args["vSessionsId"]
 channel = 2
else 

end

if callid == nil then
 ngx.say(uri)
 ngx.say(cjson.encode(args))
 ngx.say('callid is empty')
 return ''
end


local key = callid .. '_channel' .. channel
local res = cache:get(key)
if res == ngx.null then
 ngx.say("cache get error")
 return ''
end

ngx.var.backend = res