6b7fbdd908
Closes #895 Add Sync Session ID to `SynchronizerState`. A SyncSession is an attempt to sync the blockchain within the lifetime of a Synchronizer. A Synchronizer can sync many times, when synced it will refresh every ~20 seconds +- random padding. each sync attempt will have a different UUID even if it's from the same instance of SDKSynchronizer. **How are SyncSessions are delimited? With `SyncStatus` changes.** changes from [`.unprepared`|`.error`|`.disconnected`|`.stopped`] to `.syncing` assign a new sessionID to the synchronizer. Any other transitions won't. `areTwoStatusesDifferent ` was refactored to a helper function of `SyncStatus` **How are IDs generated?** ID generation is not mandated but delegated to a protocol `SyncSessionIDGenerator`. Tests inject their own deterministic generator to avoid test flakiness. Default implementation of SyncSessionIDGenerator is ````Swift struct UniqueSyncSessionIDGenerator {} extension UniqueSyncSessionIDGenerator: SyncSessionIDGenerator { func nextID() -> UUID { UUID() } } ```` **SyncSession Pseudo-Atomicity and thread safety** SyncSession is a type alias of a GenericActor holding a UUID ```` typealias SyncSession = GenericActor<UUID> extension SyncSession { /// updates the current sync session to a new value with the given generator /// - Parameters generator: a `SyncSessionIDGenerator` /// - returns: the `UUID` of the newly updated value. @discardableResult func newSession(with generator: SyncSessionIDGenerator) async -> UUID { return await self.update(generator.nextID()) } } ```` Closes #895 SessionTicker struct to control session transitions. switching to `.unprepared` now makes syncID to be `.nullID` |
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ZcashLightClientKit |