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@zeropg/lease

v0.0.1

Published

Early experiment in the cheapest possible scale-to-zero Postgres. Single-writer lease on object storage for zeropg: conditional-create acquire, CAS renew/takeover, monotonic fencing tokens. No coordination service, no clock dependence for correctness.

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Links

Git

Maintainers

reisepassreisepass

Keywords

leasefencingdistributed-lockobject-storage

Readme

@zeropg/lease

A single-writer lease built entirely on object-storage conditional writes. No coordination service, no clock dependence for correctness.

  • acquire() — conditional create of lease.json; if held and unexpired → LockedError; if expired → CAS takeover with a strictly increasing fencing token (floored by the manifest, so tokens are monotonic across the bucket's whole history).
  • renew() — CAS on our own version; failure means we were taken over → FencedError. validate() — cheap read-path check. release() — CAS- guarded delete so successors can acquire instantly.
  • tookOver tells the caller a previous holder may still be alive (zeropg uses this to fence-stamp the manifest immediately).

Correctness comes from the conditional writes; the clock only tunes how aggressively expired leases are taken over. Validated live: 100/100 stale renewals rejected, 100/100 stale commits rejected, zero two-holder windows, plus a live two-service zombie test on Cloud Run (repo experiments E1, E4).