Part 1: Hacking up <transact!.
This commit is contained in:
Nick Alexander
parent
2b705019a7
commit
5202b147ee
4 changed files with 472 additions and 4 deletions
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@ -8,6 +8,7 @@
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[datomish.pair-chan :refer [go-pair <?]]
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[cljs.core.async.macros :refer [go]]))
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(:require
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[honeysql.core :as sql]
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[datomish.util :as util :refer [raise]]
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[datomish.sqlite :as s]
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[datomish.sqlite-schema :as sqlite-schema]
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@ -21,12 +22,342 @@
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[db]
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"Close this database. Returns a pair channel of [nil error]."))
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(defrecord DB [sqlite-connection]
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(defrecord DB [sqlite-connection max-tx]
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IDB
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(close [db] (close (.-sqlite-connection db))))
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(close [db] (s/close (.-sqlite-connection db))))
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(def tx0 0x2000000)
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(defn <with-sqlite-connection [sqlite-connection]
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(go-pair
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(when-not (= sqlite-schema/current-version (<? (sqlite-schema/<ensure-current-version sqlite-connection)))
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(raise "Could not ensure current SQLite schema version."))
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(->DB sqlite-connection)))
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(map->DB {:sqlite-connection sqlite-connection
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:current-tx (atom (dec tx0))}))) ;; TODO: get rid of dec.
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(defn- #?@(:clj [^Boolean tx-id?]
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:cljs [^boolean tx-id?])
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[e]
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(or (= e :db/current-tx)
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(= e ":db/current-tx"))) ;; for datascript.js interop
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(defrecord TxReport [;; db-before db-after
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tx-data tempids tx-meta])
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#?(:clj
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(defmacro cond-let [& clauses]
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(when-let [[test expr & rest] clauses]
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`(~(if (vector? test) 'if-let 'if) ~test
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~expr
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(cond-let ~@rest)))))
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(defn <allocate-tx [db]
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(go-pair
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(swap! (:current-tx db) inc)))
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(deftype Datom [e a v tx added])
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;; printing and reading
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;; #datomic/DB {:schema <map>, :datoms <vector of [e a v tx]>}
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;; (defn ^Datom datom-from-reader [vec]
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;; (apply datom vec))
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#?(:clj
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(defmethod print-method Datom [^Datom d, ^java.io.Writer w]
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(.write w (str "#datomish/Datom "))
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(binding [*out* w]
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(pr [(.-e d) (.-a d) (.-v d) (.-tx d) (.-added d)]))))
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(defn- validate-eid [eid at]
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(when-not (number? eid)
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(raise "Bad entity id " eid " at " at ", expected number"
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{:error :transact/syntax, :entity-id eid, :context at})))
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(defn- validate-attr [attr at]
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(when-not (or (keyword? attr) (string? attr))
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(raise "Bad entity attribute " attr " at " at ", expected keyword or string"
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{:error :transact/syntax, :attribute attr, :context at})))
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(defn- validate-val [v at]
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(when (nil? v)
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(raise "Cannot store nil as a value at " at
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{:error :transact/syntax, :value v, :context at})))
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(defn multival? [db attr] false)
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(defn ref? [db attr] false)
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(defn <entid [db eid]
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;; {:pre [(db? db)]}
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(go-pair
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(cond
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(number? eid) eid
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;; (sequential? eid)
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;; (cond
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;; (not= (count eid) 2)
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;; (raise "Lookup ref should contain 2 elements: " eid
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;; {:error :lookup-ref/syntax, :entity-id eid})
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;; (not (is-attr? db (first eid) :db.unique/identity))
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;; (raise "Lookup ref attribute should be marked as :db.unique/identity: " eid
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;; {:error :lookup-ref/unique
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;; :entity-id eid})
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;; (nil? (second eid))
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;; nil
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;; :else
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;; (:e (first (-datoms db :avet eid))))
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:else
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(raise "Expected number or lookup ref for entity id, got " eid
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{:error :entity-id/syntax
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:entity-id eid}))))
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(defn <entid-strict [db eid]
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(go-pair
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(or (<? (<entid db eid))
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(raise "Nothing found for entity id " eid
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{:error :entity-id/missing
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:entity-id eid}))))
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(defn <entid-some [db eid]
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(go-pair
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(when eid
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(<? (<entid-strict db eid)))))
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;; TODO: handle _?
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(defn search->sql-clause [pattern]
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(merge
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{:select [:e :a :v :tx] ;; TODO: generalize columns.
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:from [:datoms]}
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(if-not (empty? pattern)
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{:where (cons :and (map #(vector := %1 (if (keyword? %2) (str %2) %2)) [:e :a :v :tx] pattern))} ;; TODO: use schema to intern a and v.
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{})))
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(defn <search [db pattern]
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(go-pair
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;; TODO: find a better expression of this pattern.
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(let [rows (<? (->>
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(search->sql-clause pattern)
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(sql/format)
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(s/all-rows (:sqlite-connection db))))]
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(map #(Datom. (:e %) (:a %) (:v %) (:tx %) true) rows))))
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(defn- <transact-report [db report datom]
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(go-pair
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(let [exec (partial s/execute! (:sqlite-connection db))]
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;; Append to transaction log.
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(<? (exec
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["INSERT INTO transactions VALUES (?, ?, ?, ?, ?)" (.-e datom) (str (.-a datom)) (.-v datom) (.-tx datom) (.-added datom)]))
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;; Update materialized datom view.
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(if (.-added datom)
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(<? (exec
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;; TODO: use schema to insert correct indexing flags.
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["INSERT INTO datoms VALUES (?, ?, ?, ?, 0, 0)" (.-e datom) (str (.-a datom)) (.-v datom) (.-tx datom)]))
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(<? (exec
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;; TODO: verify this is correct.
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["DELETE FROM datoms WHERE (e = ? AND a = ? AND v = ?)" (.-e datom) (.-a datom) (.-v datom)])))
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(-> report
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(update-in [:tx-data] conj datom)))))
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(defn- <transact-add [db report [_ e a v tx :as entity]]
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(go-pair
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(validate-attr a entity)
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(validate-val v entity)
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(let [tx (or tx (:current-tx report))
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e (<? (<entid-strict db e))
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v (if (ref? db a) (<? (<entid-strict db v)) v)
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datom (Datom. e a v tx true)]
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(if (multival? db a)
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;; TODO: consider adding a UNIQUE CONSTRAINT and using INSERT OR IGNORE.
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(if (empty? (<? (<search db [e a v])))
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(<? (<transact-report db report datom))
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report)
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(if-let [^Datom old-datom (first (<? (<search db [e a])))]
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(if (= (.-v old-datom) v)
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report
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(let [ra (<? (<transact-report db report (Datom. e a (.-v old-datom) tx false)))
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rb (<? (<transact-report db ra datom))]
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rb)) ;; TODO: express this better.
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(<? (<transact-report db report datom)))))))
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(defn- <transact-retract [db report [_ e a v _ :as entity]] ;; TODO: think about retracting with tx.
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(go-pair
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(let [tx (:current-tx report)]
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(if-let [e (<? (<entid db e))]
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(let [v (if (ref? db a) (<? (<entid-strict db v)) v)]
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(validate-attr a entity)
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(validate-val v entity)
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(if-let [old-datom (first (<? (<search db [e a v])))]
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(<? (<transact-report db report (Datom. e a v tx false)))
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report))
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report))))
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(defn <transact-tx-data
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[db now initial-report initial-es]
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(go-pair
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(when-not (or (nil? initial-es)
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(sequential? initial-es))
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(raise "Bad transaction data " initial-es ", expected sequential collection"
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{:error :transact/syntax, :tx-data initial-es}))
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(loop [report initial-report
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es initial-es]
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(let [[entity & entities] es]
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(cond
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(nil? entity)
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(let [current-tx (:current-tx report)]
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(<? (<transact-report db report (Datom. current-tx :db/txInstant now current-tx true)))
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(-> report
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(assoc-in [:tempids :db/current-tx] current-tx)))
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;; (map? entity)
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;; (let [old-eid (:db/id entity)]
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;; (cond-let
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;; ;; :db/current-tx => tx
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;; (tx-id? old-eid)
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;; (let [id (current-tx report)]
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;; (recur (allocate-eid report old-eid id)
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;; (cons (assoc entity :db/id id) entities)))
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;; ;; lookup-ref => resolved | error
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;; (sequential? old-eid)
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;; (let [id (entid-strict db old-eid)]
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;; (recur report
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;; (cons (assoc entity :db/id id) entities)))
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;; ;; upserted => explode | error
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;; [upserted-eid (upsert-eid db entity)]
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;; (if (and (neg-number? old-eid)
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;; (contains? (:tempids report) old-eid)
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;; (not= upserted-eid (get (:tempids report) old-eid)))
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;; (retry-with-tempid initial-report initial-es old-eid upserted-eid)
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;; (recur (allocate-eid report old-eid upserted-eid)
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;; (concat (explode db (assoc entity :db/id upserted-eid)) entities)))
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;; ;; resolved | allocated-tempid | tempid | nil => explode
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;; (or (number? old-eid)
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;; (nil? old-eid))
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;; (let [new-eid (cond
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;; (nil? old-eid) (next-eid db)
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;; (neg? old-eid) (or (get (:tempids report) old-eid)
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;; (next-eid db))
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;; :else old-eid)
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;; new-entity (assoc entity :db/id new-eid)]
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;; (recur (allocate-eid report old-eid new-eid)
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;; (concat (explode db new-entity) entities)))
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;; ;; trash => error
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;; :else
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;; (raise "Expected number or lookup ref for :db/id, got " old-eid
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;; { :error :entity-id/syntax, :entity entity })))
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(sequential? entity)
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(let [[op e a v] entity]
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(cond
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;; (= op :db.fn/call)
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;; (let [[_ f & args] entity]
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;; (recur report (concat (apply f db args) entities)))
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;; (= op :db.fn/cas)
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;; (let [[_ e a ov nv] entity
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;; e (entid-strict db e)
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;; _ (validate-attr a entity)
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;; ov (if (ref? db a) (entid-strict db ov) ov)
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;; nv (if (ref? db a) (entid-strict db nv) nv)
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;; _ (validate-val nv entity)
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;; datoms (<searchdb [e a])]
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;; (if (multival? db a)
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;; (if (some (fn [^Datom d] (= (.-v d) ov)) datoms)
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;; (recur (transact-add report [:db/add e a nv]) entities)
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;; (raise ":db.fn/cas failed on datom [" e " " a " " (map :v datoms) "], expected " ov
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;; {:error :transact/cas, :old datoms, :expected ov, :new nv}))
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;; (let [v (:v (first datoms))]
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;; (if (= v ov)
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;; (recur (transact-add report [:db/add e a nv]) entities)
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;; (raise ":db.fn/cas failed on datom [" e " " a " " v "], expected " ov
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;; {:error :transact/cas, :old (first datoms), :expected ov, :new nv })))))
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(tx-id? e)
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(recur report (cons [op (:current-tx report) a v] entities))
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;; (and (ref? db a) (tx-id? v))
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;; (recur report (cons [op e a (current-tx report)] entities))
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;; (neg-number? e)
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;; (if (not= op :db/add)
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;; (raise "Negative entity ids are resolved for :db/add only"
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;; {:error :transact/syntax
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;; :op entity })
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;; (let [upserted-eid (when (is-attr? db a :db.unique/identity)
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;; (:e (first (-datoms db :avet [a v]))))
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;; allocated-eid (get-in report [:tempids e])]
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;; (if (and upserted-eid allocated-eid (not= upserted-eid allocated-eid))
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;; (retry-with-tempid initial-report initial-es e upserted-eid)
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;; (let [eid (or upserted-eid allocated-eid (next-eid db))]
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;; (recur (allocate-eid report e eid) (cons [op eid a v] entities))))))
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;; (and (ref? db a) (neg-number? v))
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;; (if-let [vid (get-in report [:tempids v])]
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;; (recur report (cons [op e a vid] entities))
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;; (recur (allocate-eid report v (next-eid db)) es))
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(= op :db/add)
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(recur (<? (<transact-add db report entity)) entities)
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(= op :db/retract)
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(recur (<? (<transact-retract db report entity)) entities)
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;; (= op :db.fn/retractAttribute)
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;; (if-let [e (entid db e)]
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;; (let [_ (validate-attr a entity)
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;; datoms (<search db [e a])]
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;; (recur (reduce transact-retract-datom report datoms)
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;; (concat (retract-components db datoms) entities)))
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;; (recur report entities))
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;; (= op :db.fn/retractEntity)
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;; (if-let [e (entid db e)]
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;; (let [e-datoms (<search db [e])
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;; v-datoms (mapcat (fn [a] (<search db [nil a e])) (-attrs-by db :db.type/ref))]
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;; (recur (reduce transact-retract-datom report (concat e-datoms v-datoms))
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;; (concat (retract-components db e-datoms) entities)))
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;; (recur report entities))
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:else
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(raise "Unknown operation at " entity ", expected :db/add, :db/retract, :db.fn/call, :db.fn/retractAttribute or :db.fn/retractEntity"
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{:error :transact/syntax, :operation op, :tx-data entity})))
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;; (datom? entity)
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;; (let [[e a v tx added] entity]
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;; (if added
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;; (recur (transact-add report [:db/add e a v tx]) entities)
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;; (recur report (cons [:db/retract e a v] entities))))
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:else
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(raise "Bad entity type at " entity ", expected map or vector"
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{:error :transact/syntax, :tx-data entity})
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)))))
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(defn <transact!
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([db tx-data]
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(<transact! db tx-data nil 0xdeadbeef)) ;; TODO: timestamp!
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([db tx-data tx-meta now]
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;; {:pre [(db/db? db)]}
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(go-pair
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(let [current-tx (<? (<allocate-tx db))]
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(<? (<transact-tx-data db now
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(map->TxReport
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{:current-tx current-tx
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:tx-data []
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:tempids {}
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:tx-meta tx-meta}) tx-data))))))
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#_ (a/<!! (<transact! db []))
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#_ .
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#_ (def db (<?? (<with-sqlite-connection (<?? (s/<sqlite-connection "/Users/nalexander/test5.db")))))
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#_ (<?? (<transact! db [[:db/add 0 1 "test"]]))
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#_ (<?? (<transact! db [[:db/retract 0 1 "test"]]))
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41
src/datomish/repl.clj
Normal file
41
src/datomish/repl.clj
Normal file
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@ -0,0 +1,41 @@
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;; This Source Code Form is subject to the terms of the Mozilla Public
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;; License, v. 2.0. If a copy of the MPL was not distributed with this
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;; file, You can obtain one at http://mozilla.org/MPL/2.0/.
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(ns datomish.repl
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(:require
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[datomish.db :as db]
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[datomish.util :as util :refer [raise]]
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[datomish.sqlite :as s]
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[datomish.jdbc-sqlite :as j]
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[tempfile.core]
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[datomish.pair-chan :refer [go-pair <?]]
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[clojure.core.async :as a :refer [go <! >! <!! >!!]]))
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(defn <?? [pair-chan]
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(datomish.pair-chan/consume-pair (<!! pair-chan)))
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(defn debug-db [db]
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(<??
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(go-pair
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(let [ds (<? (s/all-rows (:sqlite-connection db) ["SELECT e, a, v, tx FROM datoms"]))]
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(println (count ds) "datoms.")
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(doseq [d ds] (println d)))
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(let [ts (<? (s/all-rows (:sqlite-connection db) ["SELECT * FROM transactions"]))]
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(println (count ts) "transactions.")
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(doseq [t ts] (println t)))))
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db)
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(defn reset-db! [db]
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(<??
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(go-pair
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(<? (s/execute! (:sqlite-connection db) ["DELETE FROM datoms"]))
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(<? (s/execute! (:sqlite-connection db) ["DELETE FROM transactions"]))))
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db)
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(defn db-with [datoms]
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(go-pair
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(let [c (<? (s/<sqlite-connection (tempfile.core/tempfile)))
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d (<? (db/<with-sqlite-connection c))]
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(<? (db/<transact! d datoms))
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d)))
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@ -24,7 +24,7 @@
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"CREATE INDEX avet ON datoms (a, v, e) WHERE index_avet = 1" ;; Opt-in index: only if a has :db/index true.
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"CREATE INDEX vaet ON datoms (v, a, e) WHERE index_vaet = 1" ;; Opt-in index: only if a has :db/valueType :db.type/ref
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"CREATE TABLE transactions (e INTEGER NOT NULL, a SMALLINT NOT NULL, v BLOB NOT NULL, tx INTEGER NOT NULL, added TINYINT NOT NULL DEFAULT 1)"
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"CREATE INDEX tx ON transactions (tx)"
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"CREATE INDEX tx ON transactions (tx, e, a)" ;; Allow to find a previous value relatively efficiently.
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"CREATE TABLE attributes (name TEXT NOT NULL PRIMARY KEY, a INTEGER UNIQUE NOT NULL)"])
|
||||
|
||||
(defn <create-current-version
|
||||
|
|
|
|||
96
test/datomish/db_test.cljc
Normal file
96
test/datomish/db_test.cljc
Normal file
|
|
@ -0,0 +1,96 @@
|
|||
;; This Source Code Form is subject to the terms of the Mozilla Public
|
||||
;; License, v. 2.0. If a copy of the MPL was not distributed with this
|
||||
;; file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
||||
|
||||
(ns datomish.db-test
|
||||
#?(:cljs
|
||||
(:require-macros
|
||||
[datomish.pair-chan :refer [go-pair <?]]
|
||||
[datomish.node-tempfile-macros :refer [with-tempfile]]
|
||||
[cljs.core.async.macros :as a :refer [go]]))
|
||||
(:require
|
||||
[datomish.util :as util :refer [raise]]
|
||||
[datomish.sqlite :as s]
|
||||
[datomish.db :as db]
|
||||
#?@(:clj [[datomish.pair-chan :refer [go-pair <?]]
|
||||
[tempfile.core :refer [tempfile with-tempfile]]
|
||||
[datomish.test-macros :refer [deftest-async]]
|
||||
[clojure.test :as t :refer [is are deftest testing]]
|
||||
[clojure.core.async :refer [go <! >!]]])
|
||||
#?@(:cljs [[datomish.pair-chan]
|
||||
[datomish.test-macros :refer-macros [deftest-async]]
|
||||
[datomish.node-tempfile :refer [tempfile]]
|
||||
[cljs.test :as t :refer-macros [is are deftest testing async]]
|
||||
[cljs.core.async :as a :refer [<! >!]]])))
|
||||
|
||||
(defn <datoms [db]
|
||||
(go-pair
|
||||
(->>
|
||||
(<? (s/all-rows (:sqlite-connection db) ["SELECT e, a, v, tx FROM datoms ORDER BY tx ASC, e, a, v"]))
|
||||
(mapv #(vector (:e %) (:a %) (:v %) (:tx %) true)))))
|
||||
|
||||
(defn <transactions [db]
|
||||
(go-pair
|
||||
(->>
|
||||
(<? (s/all-rows (:sqlite-connection db) ["SELECT e, a, v, tx, added FROM transactions ORDER BY tx ASC, e, a, v, added"]))
|
||||
(mapv #(vector (:e %) (:a %) (:v %) (:tx %) (:added %))))))
|
||||
|
||||
(deftest-async test-add-one
|
||||
(with-tempfile [t (tempfile)]
|
||||
(let [c (<? (s/<sqlite-connection t))
|
||||
db (<? (db/<with-sqlite-connection c))]
|
||||
(try
|
||||
(let [now -1
|
||||
report (<? (db/<transact! db [[:db/add 0 :a "value"]] nil now))
|
||||
current-tx (:current-tx report)]
|
||||
(is (= current-tx db/tx0))
|
||||
(is (= (<? (<datoms db))
|
||||
[[0 ":a" "value" db/tx0 true]
|
||||
[db/tx0 ":db/txInstant" now db/tx0 true]]))
|
||||
(is (= (<? (<transactions db))
|
||||
[[0 ":a" "value" db/tx0 1] ;; TODO: true, not 1.
|
||||
[db/tx0 ":db/txInstant" now db/tx0 1]])))
|
||||
(finally
|
||||
(<? (db/close db)))))))
|
||||
|
||||
(deftest-async test-add-two
|
||||
(with-tempfile [t (tempfile)]
|
||||
(let [c (<? (s/<sqlite-connection t))
|
||||
db (<? (db/<with-sqlite-connection c))]
|
||||
(try
|
||||
(let [now -1
|
||||
report (<? (db/<transact! db [[:db/add 0 :a "valuea"] [:db/add 1 :b "valueb"]] nil now))
|
||||
current-tx (:current-tx report)]
|
||||
(is (= current-tx db/tx0))
|
||||
(is (= (<? (<datoms db))
|
||||
[[0 ":a" "valuea" db/tx0 true]
|
||||
[1 ":b" "valueb" db/tx0 true]
|
||||
[db/tx0 ":db/txInstant" now db/tx0 true]]))
|
||||
(is (= (<? (<transactions db))
|
||||
[[0 ":a" "valuea" db/tx0 1] ;; TODO: true, not 1.
|
||||
[1 ":b" "valueb" db/tx0 1]
|
||||
[db/tx0 ":db/txInstant" now db/tx0 1]])))
|
||||
(finally
|
||||
(<? (db/close db)))))))
|
||||
|
||||
;; TODO: test multipe :add and :retract of the same datom in the same transaction.
|
||||
(deftest-async test-retract
|
||||
(with-tempfile [t (tempfile)]
|
||||
(let [c (<? (s/<sqlite-connection t))
|
||||
db (<? (db/<with-sqlite-connection c))]
|
||||
(try
|
||||
(let [now -1
|
||||
ra (<? (db/<transact! db [[:db/add 0 :a "value"]] nil now))
|
||||
rb (<? (db/<transact! db [[:db/retract 0 :a "value"]] nil now))
|
||||
txa (:current-tx ra)
|
||||
txb (:current-tx rb)]
|
||||
(is (= (<? (<datoms db))
|
||||
[[txa ":db/txInstant" now txa true]
|
||||
[txb ":db/txInstant" now txb true]]))
|
||||
(is (= (<? (<transactions db))
|
||||
[[0 ":a" "value" txa 1] ;; TODO: true, not 1.
|
||||
[txa ":db/txInstant" -1 txa 1]
|
||||
[0 ":a" "value" txb 0]
|
||||
[txb ":db/txInstant" -1 txb 1]])))
|
||||
(finally
|
||||
(<? (db/close db)))))))
|
||||
Loading…
Reference in a new issue