A method for openresty to read redis into shared memory during the init_by_lua_file stage

Prerequisite:

                                                                                                                                   activating and activating and activating ngx_lua to ngx_lua to ngx_lua to ngx to ngx_lua to being using out of out out of Redis data can only be read in the rewrite or access phase. How to read it in the initialization phase?

Solution:

Use the method of calling the shell command in the init stage, which is equivalent to executing a shell command in the init stage, reading the redis data, and parsing the read text data, that is, you can read the redis data to Example in nginx:

1 There is a hash in redis, the stored data is:

hmset test_hash f1 v1 f2 v2 f3 v3

2 The code read in init_by_lua_file is:

local cmd = "redis-cli hgetall test_hash"

local f = io.popen(cmd

)

local content = f:read("*a")

f:close()The memory in the above content is the data in redis.

It should be noted that the content here is a string, which needs to be re-parsed into a dictionary by yourself. It can be stored in a variable or in shared memory.

The above introduces a method for openresty to read redis into shared memory in the init_by_lua_file stage, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.