[rfd-599] Implement skeleton external subnets API #9638
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mergeconflict
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rcgoodfellow and
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bnaecker
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This all looks pretty good! I just have one substantive suggestion to strengthen the types around creating subnets, but otherwise seems like a solid start.
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…ernal API (#9669) From discussion in #9638 (comment), we decided that `AddressSelector` is a bit of a misnomer in our current scheme, where "selector" implies filtering/fetching from existing resources. We'll use `AddressAllocator` instead, which better describes the action of reserving/assigning a floating IP address from a pool. I've also done a bit of refactoring here to be more RFD 619 friendly. Before this PR, we had a series of `FloatingIpCreate` versions that each had `From` or `TryFrom` conversions directly to the latest API version in "big step" style. This becomes an _O(n)^2_ problem to maintain over time. Instead, in this PR, we convert to "small step" style, where each older version of `FloatingIpCreate` converts to the next newer version. In the terms of the RFD, we "[hop through intermediate versions](https://rfd.shared.oxide.computer/rfd/0619#determinations-one-prior-version)." This ensures that the next time we change `FloatingIpCreate`, we only need to introduce one new conversion, rather than update all older conversions. I've added proptests to make our expectations of the conversion behavior more explicit and prevent regressions.
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Pull Request: #9638
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Based on #9634, this PR implements a skeleton
/v1/external-subnetsREST API for allocating external subnets from subnet pools, and attaching them to instances, as described in RFD 599.