use sentinel connect find the master IP is the pod ip

[majulong]

I used the sentinel to connect, is the pod IP.
Also, how to use get_master method. my Code is
local rc = require("resty.redis.connector").new(redis)

local redis, err = rc:connect{
url = "sentinel://mymaster:a/2",
sentinels = {
{ host = "10.62.108.88", port = 32641 },
}
}
if not redis then
ngx.say("close redis error : ", err)
end

local master, err = require("resty.redis.sentinel").get_master(sentinels, master_name)
if not master then
ngx.say("close redis error : ", err)
end

I already changed the sentinels in the default table. like:
sentinels = {
{ host = "10.62.108.88", port = 32641 },
}
the Output is

2019/02/27 02:09:43 [error] 32187#32187: *46 lua tcp socket connect timed out, when connecting to 172.30.63.147:6379, client: 127.0.0.1, server: , request: "GET /lua_redis_basic HTTP/1.1", host: "localhost:800"
2019/02/27 02:09:43 [error] 32187#32187: *46 lua entry thread aborted: runtime error: ...y/lua-resty-redis-connector/lib/resty/redis/sentinel.lua:18: attempt to index local 'sentinel' (a nil value)
stack traceback:
coroutine 0:
...y/lua-resty-redis-connector/lib/resty/redis/sentinel.lua: in function 'get_master'
/usr/local/openresty/nginx/conf/test.lua:14: in function </usr/local/openresty/nginx/conf/test.lua:1>, client: 127.0.0.1, server: , request: "GET /lua_redis_basic HTTP/1.1", host: "localhost:800"
curl: (52) Empty reply from server

what can I do? Thanks! @pintsized @andrewsharpe @stockrt

[majulong]

my goal is use nignx can find the master redis and only be the proxy for that. my plan is find the master's IP by sentinel, and set the IP as a parameter that I can use that in stream to proxy_pass.
Can this module achieve it?
thanks!