The resty-umzila module serves as a flexible and efficient routing solution for OpenResty applications written in Lua. It allows developers to define routes using HTTP methods and URL patterns, with support for named parameters like : userId as well as wildcard sub-paths designated by an asterisk *. Routes are compiled at the time of registration for optimized performance. The module matches incoming requests to the defined routes, extracts parameters and sub-paths, and invokes the corresponding handler functions, passing in any captured values. If no route matches, the module returns a "Not Found" HTTP 404 response.

The following is a minimal nginx.conf configuration that demonstrates how to use the resty-umzila module within an OpenResty setup. Make sure your resty/umzila.lua file is placed in a directory that is part of Lua's package path, or adjust the lua_package_path directive accordingly

worker_processes  1;

events {
    worker_connections  1024;
}

http {
    server {
        listen       8080;
        server_name  localhost;

        location / {
            content_by_lua_block {
                local router = require "resty.umzila"

                router.register('GET', '/', function(params)
                    ngx.say("Welcome to the home page")
                end)

                router.register('GET', '/users/:userId', function(params)
                    ngx.say("User ID: " .. params.userId)
                end)

                router.register('GET', '/downloads/*', function(params)
                    ngx.say("Downloads, sub-path: " .. params.wildcard)
                end)

                router.handle_request()
            }
        }

        # Additional configuration and other locations
    }

    # Additional server blocks
}

Here's a quick rundown of the key parts:

• worker_processes and events: Basic Nginx setup.

• listen 8080;: The server listens on port 8080.

• content_by_lua_block: OpenResty's directive for inline Lua code.

• local router = require "resty.umzila": Requires your resty-umzila Lua module.

• router.register: Register routes and their handler functions.

• router.handle_request(): Invokes the router to handle incoming requests.

• With this configuration, navigating to http://localhost:8080/ would execute the function that says "Welcome to the home page". Similarly, http://localhost:8080/users/123 would display "User ID: 123", and http://localhost:8080/downloads/sub-path/example would show "Downloads, sub-path: sub-path/example".