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persist: stream catalog — enumerate streams + 10 tests
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New backend op :streams (from seq high-water marks, so compacted streams still
list), threaded through mem-backend + durable serve/io-backend. catalog.sx:
persist/streams, stream-count, stream-exists?, total-events. 143/143.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
giles
2026-06-06 19:20:22 +00:00
parent 8e16ba6b04
commit a00439da6e
8 changed files with 131 additions and 9 deletions
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4
lib/persist/durable.sx
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@@ -12,6 +12,7 @@
(define persist/req-append (fn (stream event) {:op "persist/append" :args (list stream event)}))
(define persist/req-read (fn (stream) {:op "persist/read" :args (list stream)}))
(define persist/req-last-seq (fn (stream) {:op "persist/last-seq" :args (list stream)}))
(define persist/req-streams (fn () {:op "persist/streams" :args (list)}))
(define persist/req-truncate (fn (stream n) {:op "persist/truncate" :args (list stream n)}))
(define persist/req-kv-get (fn (key) {:op "persist/kv-get" :args (list key)}))
(define persist/req-kv-put (fn (key val) {:op "persist/kv-put" :args (list key val)}))
@@ -20,7 +21,7 @@
(define persist/req-kv-keys (fn () {:op "persist/kv-keys" :args (list)}))
; a backend parameterized over a transport (req -> response)
(define persist/io-backend (fn (transport) {:truncate-through (fn (stream n) (transport (persist/req-truncate stream n))) :kv-keys (fn () (transport (persist/req-kv-keys))) :read (fn (stream) (transport (persist/req-read stream))) :kv-has? (fn (key) (transport (persist/req-kv-has? key))) :last-seq (fn (stream) (transport (persist/req-last-seq stream))) :append (fn (stream event) (transport (persist/req-append stream event))) :kv-delete (fn (key) (transport (persist/req-kv-delete key))) :kv-put (fn (key val) (transport (persist/req-kv-put key val))) :kv-get (fn (key) (transport (persist/req-kv-get key)))}))
(define persist/io-backend (fn (transport) {:truncate-through (fn (stream n) (transport (persist/req-truncate stream n))) :kv-keys (fn () (transport (persist/req-kv-keys))) :read (fn (stream) (transport (persist/req-read stream))) :kv-has? (fn (key) (transport (persist/req-kv-has? key))) :last-seq (fn (stream) (transport (persist/req-last-seq stream))) :streams (fn () (transport (persist/req-streams))) :append (fn (stream event) (transport (persist/req-append stream event))) :kv-delete (fn (key) (transport (persist/req-kv-delete key))) :kv-put (fn (key val) (transport (persist/req-kv-put key val))) :kv-get (fn (key) (transport (persist/req-kv-get key)))}))
; production backend — transport is the kernel's perform (suspends; host resumes)
(define
@@ -43,6 +44,7 @@
(persist/backend-read disk (first args)))
((equal? op "persist/last-seq")
(persist/backend-last-seq disk (first args)))
((equal? op "persist/streams") (persist/backend-streams disk))
((equal? op "persist/truncate")
(persist/backend-truncate disk (first args) (nth args 1)))
((equal? op "persist/kv-get")