Plugin for geo-restricting the access to the server

[gzsombor]

Allow or deny list, or just reporting to the logs

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Description

Type of Change

• ✨ New feature

Developer Checklist

• I have run cargo fmt to format the code.
• I have run cargo clippy and resolved any warnings.
• My code builds and runs successfully.
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[vicanso]

1. Stop creating new Strings for every request
   In handle_request, using .to_string() creates a new string every time, which slows down the proxy. Since lookup_country_code already returns a text reference (&str), you should use that directly to save memory and improve speed.

2. Load the GeoIP database only once
   Right now, if this plugin is used in multiple places, it loads the whole database into memory multiple times. You should use std::sync::LazyLock to make the database global. This way, it only loads once and all plugins share it, which saves memory and makes startup much faster.

3. Replace the embedded DB with MaxMind DB (.mmdb)

Allow users to specify an external .mmdb file path in their configuration (e.g., db_path = "/path/to/geo.mmdb").

Why it's better:

• Customizable: Users can easily inject their own custom IP rules into the .mmdb file.
• Hot-Updatable: You can update the GeoIP database file on the server at any time without needing to recompile the proxy.
• Memory Efficient: The maxminddb crate reads files very efficiently without blowing up your RAM.