Ilia Denisov
41 lines
1.3 KiB
Markdown
41 lines
1.3 KiB
Markdown
# `galaxy/geoip`
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`galaxy/geoip` is a small in-process library that resolves a country from an IP
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address by reading a local MaxMind `.mmdb` database.
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The package is intended for trusted internal services such as `Edge Gateway`
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and `Geo Profile Service`. It is not a standalone network service.
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## Requirements
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- A local country-capable MaxMind database in `.mmdb` format.
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- `GeoLite2 Country` is the expected default database for product deployments.
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- One long-lived `Resolver` instance should be reused across goroutines and
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closed during process shutdown.
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## Usage
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See [example](example/) directory.
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## Error Semantics
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- `ErrInvalidAddress`: the caller supplied an invalid IP string or `netip.Addr`.
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- `ErrCountryNotFound`: the IP is valid, but the database has no country record
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for it. This is the expected fail-open branch for private, local, or
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otherwise unmapped addresses.
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- `ErrClosed`: the resolver has already been closed.
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Returned country codes are normalized to uppercase `ISO 3166-1 alpha-2`
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because that is the country format exposed by MaxMind Country databases.
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## Test Data
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Tests use the MaxMind reference fixtures via a git submodule under
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`pkg/geoip/test-data`.
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Initialize submodules before running package tests:
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```bash
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git submodule update --init --recursive
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```
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