use websocket client to sync data in local redis before nginx is accessible about lua-resty-websocket

[zhuizhuhaomeng]

sync data in the priviledge process, drop the request before the sync is completed.

[x-077]

Hello @zhuizhuhaomeng ,

Im not sure to understand. openresty is quite new for me could you please be a bit more specific ?

Thanks

[doujiang24]

@matth-c3

Can I do the same thing directly on nginx level using LUA
Could you please clarify the "same thing"? Do you want to use openresty to build a WebSocket server?

[x-077]

Hello @doujiang24 ,

No, I would like to use the lua-resty-websocket client to establish a persistant connection to a remote server, before openresty/nginx is resdy to accept connections. I would do that in the init_* block but its not possible with lua-resty-{weboscket / redis }.

[doujiang24]

okay, you can create a zero delay timer in init_worker_by_lua, like

init_worker_by_lua_block {
  local ok, err = ngx.timer.at(0, websocket_client_func)
}

you can do anything in the websocket_client_func then.

but just be noticed that the timer runs asynchronous, it won't stop openresty to accept connections.