[nginx]lua操作redis

local redis = require "resty.redis"
                local red = redis:new()
 
                red:set_timeout() --  sec
 
                -- or connect to a unix domain socket file listened
                -- by a redis server:
                --     local ok, err = red:connect("unix:/path/to/redis.sock")
 
                local ok, err = red:connect("127.0.0.1", )
                if not ok then
                    ngx.say("failed to connect: ", err)
                    return
                end
 
                ok, err = red:set("dog", "an animal")
                if not ok then
                    ngx.say("failed to set dog: ", err)
                    return
                end
 
                ngx.say("set result: ", ok)
 
                local res, err = red:get("dog")
                if not res then
                    ngx.say("failed to get dog: ", err)
                    return
                end
 
                if res == ngx.null then
                    ngx.say("dog not found.")
                    return
                end
 
                ngx.say("dog: ", res)
 
                red:init_pipeline()
                red:set("cat", "Marry")
                red:set("horse", "Bob")
                red:get("cat")
                red:get("horse")
                local results, err = red:commit_pipeline()
                if not results then
                    ngx.say("failed to commit the pipelined requests: ", err)
                    return
                end
 
                for i, res in ipairs(results) do
                    if type(res) == "table" then
                        if res[] == false then
                            ngx.say("failed to run command ", i, ": ", res[])
                        else
                            -- process the table value
                        end
                    else
                        -- process the scalar value
                    end
                end
 
                -- put it into the connection pool of size ,
                -- with  seconds max idle time
                local ok, err = red:set_keepalive(, )
                if not ok then
                    ngx.say("failed to set keepalive: ", err)
                    return
                end
 
                -- or just close the connection right away:
                -- local ok, err = red:close()
                -- if not ok then
                --     ngx.say("failed to close: ", err)
                --     return
                -- end
            ';