Cloudflare record store: portable providers and Workers KV pass the record contract #479

Summary

On Cloudflare, the portable DynamoDB and celld providers pass the record contract, and Workers KV meets it or reports KvError::Unsupported.

Behavior

On each platform the portable DynamoDB and celld providers (EZI-2p) pass the EZI-2a contract, and the native store meets it or reports KvError::Unsupported; DEC-8 picks the default.

Acceptance criteria

• The contract suite passes for every store offered there, and a native store that cannot meet it reports Unsupported, so identity on it is rejected at startup

Dependencies

Blocked by:

• KvStore record contract with listing strong within a partition #472 KvStore record contract with listing strong within a partition (new in this plan)
• Portable DynamoDB and celld providers over EdgeZero's outbound HTTP, verified on Fastly #474 Portable DynamoDB and celld providers over EdgeZero's outbound HTTP, verified on Fastly (new in this plan)

Waits on these decisions:

• DEC-8 Cloudflare and Spin store (open). Which store Cloudflare and Spin use by default for the record: the DynamoDB or celld adapter, or a native store that meets the contract, per Platform support. Blocks EZI-2c, EZI-2s, R3, T8 and T9.

Blocks:

• Integration-branch tag with the Cloudflare parts #492 Integration-branch tag with the Cloudflare parts (new in this plan)

Related

• Needed by Server-side identity on every adapter trusted-server#1558, server-side identity on every adapter. Planned in wave 11 (after the MVP: Cloudflare); priority P2, size L.
• Requirement EZI-2c in the design.