Use lua-nginx in openresty to create a socket instance

Use lua-nginx in openresty to create a socket instance

This article mainly introduces how to use lua-nginx to create a socket instance in openresty. This article provides the code instance and running effect. For more information, see

The Lua language is so powerful, at least I think so. The original Lua does not have the Socket function. You need to download the Lua socket component and require it. The lua-nginx module comes with the socket function and is in the non-blocking mode of 100%. Thanks again to Chapter Yichun.

The use of the socket function is very simple. There are only a few simple methods, there are mainly differences between TCP and UDP. (This is only the lua file. For more information, see the Hello world article)

The Code is as follows:

Local sock = ngx. socket. tcp ()

Local OK, err = sock: connect ('whois .cnnic.net.cn ', 43)

If not OK then

Ngx. say ('failed' to connect whois Server', err)

Return

End

Sock: settimeout (5000)

Local OK, err = sock: send ("baidu.cn \ r \ n ")

If not OK then

Ngx. say ('failed' to send data to whois Server', err)

Return

End

Local line, err, partial = sock: receive ('* ')

If not line then

Ngx. say ('failed' to read a line', err)

Return

End

Ngx. print (line)

Perfect run: