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openrestyProxyBackend.lua

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+--[[
+    Created by: wangsuipeng
+    Edit: 20240125
+    Last Modify: 20240126
+    version: 1.1
+    Description:
+        脚本主要用于实现获取redis中的链接。
+--]]
+
+-- 参数配置
+-- 默认upstream
+local default_backend = "danceaiStream"
+
+-- redis
+local redis_host = "60.204.148.84"
+local redis_port = 6379
+local redis_pwd = "xm!redis123"
+local redis_db = 15
+
+-- 需要获取的zset名称
+local redis_zset = "danceai"
+
+-- 连接池最大空闲时间
+-- 单位为ms
+local redis_pool_idle_time = 10000
+-- 连接池大小
+local redis_pool_size = 100
+-- redis超时时间
+-- 单位为ms
+local redis_timeout =1000
+
+local redis = require("resty.redis")
+-- 关闭redis连接
+local function close_redis(red)
+    if not red then
+        return
+    end
+    --释放连接(连接池实现)
+    local pool_max_idle_time = redis_pool_idle_time
+    local pool_size = redis_pool_size
+    local ok, err = red:set_keepalive(pool_max_idle_time, pool_size)
+    if not ok then
+        ngx.log(ngx.ERR, "set redis keepalive error : ", err)
+        return ngx.say("redis server error")
+        --ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR) -- 500
+    end
+        ngx.log(ngx.INFO,"close redis success")
+end
+
+-- 创建连接实例
+local r = redis:new()
+-- 超时时间
+r:set_timeout(redis_timeout)
+-- 连接redis
+local ok, err = r:connect(redis_host, redis_port)
+-- 判断是否连接成功
+-- 若不成功,使用行配置的upstream
+if not ok then
+    ngx.log(ngx.ERR, "connect redis error : ", err)
+    ngx.var.backend = default_backend
+    return
+    --ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR) -- 500
+end
+
+-- 验证
+local rs,err = r:auth(redis_pwd)
+if not rs then
+    ngx.log(ngx.ERR, "auth redis error : ", err)
+    ngx.var.backend = default_backend
+    return
+    --ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR) -- 500
+end
+-- 切换到相应db
+r:select(redis_db)
+-- 查询zset
+local data,err = r:zrange(redis_zset,0,0)
+-- 判断是否查询到
+-- 若查询失败或结果为空,则使用自行配置的upstream
+-- 否则,使用查询到的链接
+if not data or #data == 0 then
+    ngx.log(ngx.WARN, "get backend error : ", err)
+    ngx.var.backend = default_backend
+else
+    for _,backend in pairs(data) do
+        ngx.var.backend = backend
+    end
+end
+close_redis(r)