A method for Openresty to read Redis to shared memory in the init_by_lua_file phase

Premise:

For openresty or Ngx_lua please refer to: http://openresty.org/en/

Problem:

When using Openresty to read data within Redis, Redis is not connected in init_by_lua_file, so sometimes it is only possible to read Redis data in the rewrite or access phase, and what is the way to read it during the initialization phase?

Workaround:

The method of invoking the shell command in the init phase is equivalent to executing a shell command in the init phase, reading the Redis data, parsing the read text data, which can be achieved by reading the Redis data into Nginx

Example:

1 There is a hash in Redis that stores data as:

Hmset Test_hash F1 v1 F2 v2 F3 v3

The code read in 2 Init_by_lua_file is:

Local cmd = "redis-cli hgetall test_hash"

local F = io.popen (cmd)

Local content = F:read ("*a")

F:close ()

Memory in the content above is the data in Redis.

Note that the content here is a string that needs to be re-parsed into a dictionary, can be stored in a variable, or can exist in shared memory.

The above describes a openresty in the init_by_lua_file phase of the method of reading Redis to shared memory, including aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

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