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# Conflicts: # common/src/commonMain/kotlin/com/powersync/db/PowerSyncDatabaseImpl.kt # common/src/commonMain/kotlin/com/powersync/sync/StreamingSyncClient.kt # common/src/commonMain/kotlin/com/powersync/sync/SyncOptions.kt
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This implements a possible approach for the backend connector split (https://github.com/orgs/powersync-ja/discussions/787).
API changes
(These should not be considered final)
This splits
PowerSyncBackendConnectorinto two new interfaces:Authenticator(used for downloads), exposing theresolveCredentials()andinvalidateCredentials()methods. The name ofresolveCredentialsreflects that users won't necessarily fetch credentials everytime the method is called. In many cases, users manage the JWT as part of their app state and would simply return that.invalidateCredentials()is a hint from the SDK that the JWT has been rejected by the service.MutationUploader(used for uploads) exposesuploadMutations, called by SDKs to uploadps_crudrecords. This interface can also be implemented as a closure.A new
connect()overload takes independent authenticator and uploader instances, which allows implementing these independently and connecting in download or upload-only mode.The streaming sync implementation skips the download or upload loop if the authenticator or uploader is not set.