feat: add source/cdc change-event codec#133
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Decode the Debezium/OpenCDC JSON change-event envelope into a typed ChangeEvent (Operation enum, deferred before/after row images, decoded source metadata, commit timestamp) with BeforeAs/AfterAs projection and SourceHeaders. Tombstones decode to OpTombstone; malformed envelopes return *DecodeError (poison). Ships as a stdlib subpackage of the source module alongside retry/dlq, with a memsource consume test and a CDC-driven Drive example in source/statemachine. Native WAL connectors stay future work. Signed-off-by: Joshua Temple <[email protected]>
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What this change does
Adds
source/cdc, a change-data-capture codec for thesourceseam (one of the four roadmap items from #131). It decodes the Debezium / OpenCDC JSON change-event envelope into a typedChangeEvent:Operationenum (create/update/delete/read/tombstone),BeforeAs/AfterAs,SourceHeaders) and the commit timestamp.Tombstones decode to
OpTombstone; malformed envelopes return a*DecodeErrorso they route as poison rather than crashing the consume loop.Why
CDC turns a database into an event source, and the envelope is effectively a standard, so decoding it belongs in the suite rather than in every consumer. It ships as a stdlib-only subpackage of the
sourcemodule alongsideretry/dlq(no new dependency), with amemsourceconsume test and a CDC-drivenDriveexample insource/statemachineshowing a change event driving a statechart. Native WAL connectors stay future work; this is the decode layer they'd feed.Relates to: follows up the source Tier-1 PR (#131).
Checklist
git commit -s) per the DCOtype: subject)mage checkruns in CI across the workspace