feat(redrive): DLQ redrive tooling — safe replay (ADR-0026)#3
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The Python mirror of babelqueue-go redrive: redrive(transport, dlq, *, to_queue, max, dry_run, select) reads dead-lettered messages off a DLQ and re-publishes each to its dead_letter.original_queue or to_queue, reset (strip dead_letter, attempts->0, preserve job/trace_id/data/meta). Drains-then-processes; acks only after a successful re-publish; restores undecodable bodies and on publish failure. Pure codec+transport, no new dependency; envelope frozen. Replay-Bypass header is a documented phase two.
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The Python mirror of
babelqueue-goRedrive(ADR-0026): the operator tool for replaying off the dead-letter queue.What
redrive(transport, dlq, *, to_queue=None, max=0, dry_run=False, select=None, timeout=1.0)— reads dead-lettered messages off a DLQ and re-publishes each to itsdead_letter.original_queue(orto_queue), reset for reprocessing: thedead_letterblock is stripped andattemptsreset to 0, whilejob,trace_id,dataandmetaare preserved verbatim.to_queue— sandbox/redirect replay (the v1 safe-replay answer).dry_run— inspect and report the plan; every message restored unchanged.select— pick which messages to redrive (by reason, URN, …).max— cap how many are pulled.Drains-then-processes so restored messages aren't re-encountered; acks a DLQ message only after a successful re-publish; restores undecodable bodies rather than dropping them. Pure codec + transport — no new dependency; the envelope stays frozen (GR-1). Exposed as
babelqueue.redrive.Tests / gate
8 tests via
InMemoryTransport(to-source, sandbox, dry-run, select, max, publish-failure-restores, no-dead_letter fallback, undecodable restored).redrive.pyat 99% line coverage;ruff+mypyclean; full suite 158 passed.Follow-up
The Replay-Bypass guard (a
bq-replay-bypasstransport header surfaced to handlers so a replay can skip external side-effects) is a documented phase two, reusing ADR-0025's out-of-band-header pattern.🤖 Generated with Claude Code