WIP

deps.edn

@@ -2,7 +2,8 @@
  :deps {}
  :aliases
  {:test {:extra-paths ["test"]
-         :extra-deps {com.xtdb/xtdb-core {:mvn/version "1.23.2"}
+         :extra-deps {clojure.java-time/clojure.java-time {:mvn/version "1.3.0"}
+                      com.xtdb/xtdb-core {:mvn/version "1.23.2"}
                       lambdaisland/kaocha {:mvn/version "1.70.1086"}
                       org.slf4j/slf4j-nop {:mvn/version "1.7.36"}}
          :main-opts ["-m" "kaocha.runner"]}

src/com/cohesic/xtdb.clj

@@ -153,29 +153,66 @@ This version of the function is memoized."
         iterator-seq
         (reverse-history-before-time entity-id as-of-time opts))))
 
+(defn submit-matching-entities
+  "Submit a transaction containing the entities in input atomically.
+
+  Atomicity is implemented this way: if the new entity coincides with
+  the one on disk, no transaction is sent over and `nil` is returned.
+
+  This function also returns `nil` if entities is empty.
+
+  Finally, it uses `xt/await-tx` for making sure we block until a
+  transaction is indexed.
+
+  Otherwise this function returns the transaction returned by
+  `xt/submit-tx`.
+
+  Shout out @emccue:
+    https://clojurians.slack.com/archives/CG3AM2F7V/p1638606871304400?thread_ts=1638590188.303400&cid=CG3AM2F7V
+
+  Opts are:
+    {:start-valid-time java.util.Date
+     :end-valid-time   java.util.Date}
+
+  Note that time options are NOT applied to each entity, but to the
+  transaction as whole."
+  [xtdb-node entities & {:keys [start-valid-time] :as opts}]
+  (when (seq entities)
+    (let [entity-ids (mapv :xt/id entities)
+          results (-> (xt/db xtdb-node start-valid-time)
+                      (xt/q '{:find [(pull ?e [*])] :where [[?e :xt/id ?id]] :in [[?id ...]]}
+                            entity-ids))
+          current-entity-by-id (->> results
+                                    (map first)
+                                    (group-by :xt/id))
+          opts (assoc opts :atomic? true)
+          tx-ops (into []
+                       (mapcat #(idempotent-put-ops (-> current-entity-by-id
+                                                        (get (:xt/id %))
+                                                        first)
+                                                    %
+                                                    opts))
+                       entities)]
+      (clojure.pprint/pprint tx-ops)
+      (when (seq tx-ops)
+        (let [tx (xt/submit-tx xtdb-node tx-ops)]
+          (xt/await-tx xtdb-node tx)
+          tx)))))
+
 (defn submit-matching-entity
   "Submit a transaction with the new entity atomically.
 
-  If the new entity coincides with the one on disk, no transaction is
-  sent over and `nil` is return.
+  Atomicity is implemented this way: if the new entity coincides with
+  the one on disk, no transaction is sent over and `nil` is returned.
 
-  Otherwise what xt/submit-tx return is returned.
+  Otherwise this function returns the transaction returned by
+  `xt/submit-tx`.
 
   Shout out @emccue:
     https://clojurians.slack.com/archives/CG3AM2F7V/p1638606871304400?thread_ts=1638590188.303400&cid=CG3AM2F7V
 
   Opts are:
     {:start-valid-time java.util.Date
      :end-valid-time   java.util.Date}"
-  [xtdb-node new-entity & {:keys [start-valid-time] :as opts}]
-  (let [entity-id (:xt/id new-entity)
-        current-entity (-> (xt/db xtdb-node start-valid-time)
-                           (xt/q '{:find [(pull ?e [*])] :where [[?e :xt/id ?id]] :in [?id]}
-                                 entity-id)
-                           ffirst)
-        opts (assoc opts :atomic? true)
-        tx-ops (idempotent-put-ops current-entity new-entity opts)]
-    (when (seq tx-ops)
-      (as-> (xt/submit-tx xtdb-node tx-ops) tx
-        (xt/await-tx xtdb-node tx)
-        tx))))
+  [xtdb-node new-entity & opts]
+  (submit-matching-entities xtdb-node [new-entity] opts))

test/com/cohesic/kv_store_test.clj

@@ -0,0 +1,128 @@
+(ns com.cohesic.kv-store-test
+  (:require
+   [clojure.test :as test :refer [deftest is testing use-fixtures]]
+   [com.cohesic.xtdb :as sut]
+   [com.cohesic.xtdb.fixtures :as fixtures]
+   [com.cohesic.xtdb.test :as xtest]
+   [java-time.api :as jtime]
+   [xtdb.api :as xt]))
+
+(use-fixtures :each fixtures/with-kv-store)
+
+(deftest submit-matching-entity-sanity-check
+  (let [node xtest/*node*
+        p1 (xtest/random-person)]
+    (testing "submitting against empty database"
+      (xtest/is-committed? node (sut/submit-matching-entity node p1))
+      (is (= (:xt/id p1)
+             (-> (xt/db node)
+                 (xt/q {:find '[e] :where [['e :person/name (:person/name p1)]]})
+                 ffirst))))))
+
+(deftest submit-matching-entities-empty-entities
+  (let [node xtest/*node* entities []] (is (nil? (sut/submit-matching-entities node entities)))))
+
+(deftest submit-matching-entities-sanity-check
+  (let [node xtest/*node*
+        p1 (xtest/random-person)
+        p2 (xtest/random-person)
+        entities [p1 p2]
+        entity-ids (into #{} (map :xt/id entities))]
+    (testing "submitting against empty database"
+      (xtest/is-committed? node (sut/submit-matching-entities node entities))
+      (is (= entity-ids
+             (-> (xt/db node)
+                 (xt/q '{:find [e] :in [[?id ...]] :where [[e :xt/id ?id]]}
+                       entity-ids)
+                 (xtest/result-set)))))
+    (testing "submitting against populated database"
+      (testing "changing a document"
+        (let [p1-last-name "Foo"
+              p1-bis (assoc p1 :person/last-name p1-last-name)
+              entities [p1-bis]]
+          (xtest/is-committed? node (sut/submit-matching-entities node entities))
+          (is (= p1-last-name
+                 (-> (xt/db node)
+                     (xt/q {:find '[?last-name]
+                            :where [['e :person/name (:person/name p1)]
+                                    '[e :person/last-name ?last-name]]})
+                     ffirst)))))
+      (testing "submitting a document unchanged"
+        (let [entities [p2]]
+          (is (nil? (sut/submit-matching-entities node entities))
+              "the function returns `nil` when there is nothing to do"))))))
+
+(deftest submit-matching-entities-at-start-valid-time
+  (let [node xtest/*node*
+        p1 (xtest/random-person)
+        p2 (xtest/random-person)
+        entities [p1 p2]
+        entity-ids (into #{} (map :xt/id entities))]
+    (testing "submitting entities at :start-valid-time"
+      (let [start-valid-time (jtime/instant)]
+        (xtest/is-committed? node
+                             (sut/submit-matching-entities
+                              node
+                              entities
+                              :start-valid-time
+                              (jtime/java-date start-valid-time)))
+        (testing "fetching before :start-valid-time"
+          (let [before-start-time (jtime/minus start-valid-time (jtime/days 1))]
+            (is (empty?
+                 (-> (xt/db node (jtime/java-date before-start-time))
+                     (xt/q '{:find [e] :in [[?name ...]] :where [[e :person/name ?name]]}
+                           (mapv :person/name entities))))
+                "nothing shows up before :start-valid-time")))
+        (testing "fetching after :start-valid-time"
+          (let [after-start-time (jtime/plus start-valid-time (jtime/days 1))]
+            (is (= entity-ids
+                   (-> (xt/db node (jtime/java-date after-start-time))
+                       (xt/q '{:find [e] :in [[?name ...]] :where [[e :person/name ?name]]}
+                             (mapv :person/name entities))
+                       (xtest/result-set))))))))))
+
+(deftest submit-matching-entities-at-start+end-valid-time
+  (let [node xtest/*node*
+        p1 (xtest/random-person)
+        p2 (xtest/random-person)
+        entities [p1 p2]
+        entity-ids (into #{} (map :xt/id entities))]
+    (testing "submitting entities at :start-valid-time *and* :end-valid-time"
+      (let [start-valid-time (jtime/instant)
+            end-valid-time (jtime/plus (jtime/instant) (jtime/days 3))]
+        (println end-valid-time)
+        (xtest/is-committed? node
+                             (sut/submit-matching-entities
+                              node
+                              entities
+                              :start-valid-time (jtime/java-date start-valid-time)
+                              :end-valid-time (jtime/java-date end-valid-time)))
+        (testing "fetching before :start-valid-time"
+          (let [before-start-time (jtime/minus start-valid-time (jtime/days 1))]
+            (is (empty?
+                 (-> (xt/db node (jtime/java-date before-start-time))
+                     (xt/q '{:find [e] :in [[?name ...]] :where [[e :person/name ?name]]}
+                           (mapv :person/name entities))))
+                "nothing shows up after :end-valid-time")))
+        (testing "fetching after :start-valid-time"
+          (let [after-start-time (jtime/plus start-valid-time (jtime/days 1))]
+            (is (= entity-ids
+                   (-> (xt/db node (jtime/java-date after-start-time))
+                       (xt/q '{:find [e] :in [[?name ...]] :where [[e :person/name ?name]]}
+                             (mapv :person/name entities))
+                       (xtest/result-set)))
+                "nothing shows up after :end-valid-time")))
+        (testing "fetching before :end-valid-time"
+          (let [before-end-time (jtime/plus (jtime/instant) (jtime/days 2))]
+            (is (= entity-ids
+                   (-> (xt/db node (jtime/java-date before-end-time))
+                       (xt/q '{:find [e] :in [[?name ...]] :where [[e :person/name ?name]]}
+                             (mapv :person/name entities))
+                       (xtest/result-set))))))
+        (testing "fetching after :end-valid-time"
+          (let [after-end-time (jtime/plus end-valid-time (jtime/days 1))]
+            (is (empty?
+                 (-> (xt/db node (jtime/java-date after-end-time))
+                     (xt/q '{:find [e] :in [[?name ...]] :where [[e :person/name ?name]]}
+                           (mapv :person/name entities))))
+                "nothing shows up after :end-valid-time")))))))

test/com/cohesic/xtdb/fixtures.clj

@@ -0,0 +1,28 @@
+(ns com.cohesic.xtdb.fixtures
+  (:require
+   [clojure.java.io :as io]
+   [com.cohesic.xtdb.test :as test]
+   [xtdb.api :as xt]
+   [xtdb.io :as xio]
+   [xtdb.mem-kv])
+  (:import
+   java.nio.file.Files
+   java.nio.file.attribute.FileAttribute))
+
+(def ^:dynamic *db-dir-prefix* "cohesic-xtdb-tests")
+(def ^:dynamic *kv-opts* {})
+
+(defn with-kv-store
+  [f]
+  (let [db-dir (.toFile (Files/createTempDirectory *db-dir-prefix* (make-array FileAttribute 0)))]
+    (try
+      (letfn [(kv-store [db-dir-suffix]
+                {:kv-store (merge {:xtdb/module 'xtdb.mem-kv/->kv-store
+                                   :sync? true
+                                   :db-dir (io/file db-dir db-dir-suffix)}
+                                  *kv-opts*)})]
+        (with-open [node (xt/start-node {:xtdb/tx-log (kv-store "tx-log")
+                                         :xtdb/document-store (kv-store "doc-store")
+                                         :xtdb/index-store (kv-store "index-store")})]
+          (binding [test/*node* node] (f))))
+      (finally (xio/delete-dir db-dir)))))

test/com/cohesic/xtdb/test.clj

@@ -0,0 +1,19 @@
+(ns com.cohesic.xtdb.test
+  (:require
+   [clojure.test :as test]
+   [xtdb.api :as xt])
+  (:import
+   xtdb.api.IXtdb))
+
+(def ^:dynamic ^IXtdb *node*)
+
+(defn random-person
+  []
+  {:xt/id (random-uuid)
+   :person/name (rand-nth ["Giovanni" "Pietro" "Sergio" "Alessio" "Danilo"])
+   :person/last-name (rand-nth ["Giovannone" "Pietrone" "Sergione" "Alessione" "Danilone"])
+   :person/age (rand-int 100)})
+
+(defn is-committed? [node tx] (test/is (xt/tx-committed? node tx)))
+
+(defn result-set [results] (into #{} (map first) results))