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Over time, 'units/zone_signer.rs' will be split up into the 'signer' directory. The first step is to add 'SignerState' for signing-related per-zone state, and 'SignerZoneHandle' for signer-related operations.
These fields are part of refactoring how sign operations are stored and enqueued. They also track the necessary 'SignedZoneBuilder's for integrating with the new zone storage.
This is analogous to 'loader::refresh()'; it will serve as the top-level signing function. Over time, the implementation in 'zone_signer.rs' will be moved here and refactored.
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This PR introduces
src/signer, a module into which the zone signer module should eventually be refactored. It introduces thesigner::zonemodel, which works very similarly toloader::zone; signing and re-signing operations can be enqueued and started when possible.Signing operations need to be enqueued because the backing zone storage might be busy. I have built the enqueuing logic to account for limiting simultaneous signing operations, but that code was hard to extract from
zone_signer.rs. I'll get to it later.At the moment, none of the new functions are used anywhere. They need to wait until the actual signing code is adapted to use the
SignedZoneBuilder, otherwise they risk deadlocking the zone storage state machine. The PR performing the actual integration will deal with that.