KN first check whether there has a running nginx.
If check success, KN get running nginx configure via nginx -c <nginx config file> -T
Then KN start parse configure file.
- All domain in configure starts with '#', so find all domain via string match.
- Since locations in each server code snippet, so find all location via string match.(Normal, there only has a default location '/')
- At last, parse ingress name, namespace, service and port info in this location snippet.
When KN get all topology info, it fills these data to a struct for client get.