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Adds the canonical Phase 10 example from the plan: "Posts about cooking by people I follow (transitively)." dl-demo-cooking-rules defines reach over the follow graph (recursive transitive closure) and cooking-post-by-network joining reach + authored + (tagged P cooking). 3 new demo tests cover transitive network, direct-only follow, and empty-network cases.
96 lines
3.7 KiB
Plaintext
96 lines
3.7 KiB
Plaintext
;; lib/datalog/demo.sx — example programs over rose-ash-shaped data.
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;;
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;; Phase 10 prototypes Datalog as a rose-ash query language. Wiring
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;; the EDB to actual PostgreSQL is out of scope for this loop (it
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;; would touch service code outside lib/datalog/), but the programs
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;; below show the shape of queries we want, and the test suite runs
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;; them against synthetic in-memory tuples loaded via dl-program-data.
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;;
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;; Three thematic demos:
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;;
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;; 1. Federation — follow graph, transitive reach, mutuals.
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;; 2. Content — posts, tags, likes, popularity, "for you" feed.
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;; 3. Permissions — group membership and resource access.
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;; ── Demo 1: federation follow graph ─────────────────────────────
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;; EDB: (follows ACTOR-A ACTOR-B) — A follows B.
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;; IDB:
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;; (mutual A B) — A follows B and B follows A
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;; (reachable A B) — transitive follow closure
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;; (foaf A C) — friend of a friend (mutual filter)
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(define
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dl-demo-federation-rules
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(quote
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((mutual A B <- (follows A B) (follows B A))
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(reachable A B <- (follows A B))
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(reachable A C <- (follows A B) (reachable B C))
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(foaf A C <- (follows A B) (follows B C) (!= A C)))))
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;; ── Demo 2: content recommendation ──────────────────────────────
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;; EDB:
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;; (authored ACTOR POST)
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;; (tagged POST TAG)
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;; (liked ACTOR POST)
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;; IDB:
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;; (post-likes POST N) — count of likes per post
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;; (popular POST) — posts with >= 3 likes
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;; (tagged-by-mutual ACTOR POST) — post tagged TOPIC by someone
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;; A's mutuals follow.
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(define
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dl-demo-content-rules
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(quote
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((post-likes P N <- (authored Author P) (count N L (liked L P)))
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(popular P <- (authored Author P) (post-likes P N) (>= N 3))
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(interesting Me P
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<-
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(follows Me Buddy)
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(authored Buddy P)
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(popular P)))))
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;; ── Demo 3: role-based permissions ──────────────────────────────
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;; EDB:
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;; (member ACTOR GROUP)
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;; (subgroup CHILD PARENT)
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;; (allowed GROUP RESOURCE)
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;; IDB:
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;; (in-group ACTOR GROUP) — direct or via subgroup chain
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;; (can-access ACTOR RESOURCE) — actor inherits group permission
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(define
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dl-demo-perm-rules
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(quote
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((in-group A G <- (member A G))
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(in-group A G <- (member A H) (subgroup-trans H G))
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(subgroup-trans X Y <- (subgroup X Y))
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(subgroup-trans X Z <- (subgroup X Y) (subgroup-trans Y Z))
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(can-access A R <- (in-group A G) (allowed G R)))))
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;; ── Demo 4: cooking-posts (the canonical Phase 10 query) ────────
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;; "Posts about cooking by people I follow (transitively)."
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;; Combines federation (follows + transitive reach), authoring,
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;; tagging — the rose-ash multi-domain join.
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;;
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;; EDB:
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;; (follows ACTOR-A ACTOR-B)
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;; (authored ACTOR POST)
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;; (tagged POST TAG)
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(define
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dl-demo-cooking-rules
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(quote
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((reach Me Them <- (follows Me Them))
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(reach Me Them <- (follows Me X) (reach X Them))
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(cooking-post-by-network Me P
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<-
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(reach Me Author)
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(authored Author P)
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(tagged P cooking)))))
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;; ── Loader stub ──────────────────────────────────────────────────
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;; Wiring to PostgreSQL would replace these helpers with calls into
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;; rose-ash's internal HTTP RPC (fetch_data → /internal/data/...).
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;; The shape returned by dl-load-from-edb! is the same in either case.
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(define
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dl-demo-make
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(fn
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(facts rules)
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(dl-program-data facts rules)))
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