Storage layer scaffolding, LMDB backend

1 files changed, 53 insertions, 0 deletions

diff --git a/test/unit/backend/Storage.ml b/test/unit/backend/Storage.ml
new file mode 100644
index 0000000..91db411
--- /dev/null
+++ b/test/unit/backend/Storage.ml
@@ -0,0 +1,53 @@
+open Rnt
+
+module type CONFIGURATOR = sig
+  val configure : string -> Rnt.Concepts.Configuration.term
+end
+
+module Make (S : Abstract.Storage.STORAGE) (C : CONFIGURATOR) = struct
+  open Alcotest
+
+  let with_connection f () =
+    Helpers.with_temporary_directory "storage-test" begin fun dir ->
+        begin
+          let open Utilities.Result in
+          let* conn = S.connect (C.configure dir) in
+          Ok (f conn)
+        end
+        |> Helpers.condition_as_failure
+      end
+
+  let storage_and_retrieval conn =
+    let key = Concepts.Hash.hash_of_value (Concepts.Value.String "value") in
+    let value = Concepts.Value.Integer 42 in
+    let blob = Concepts.Representation.blob_of_value value in
+    let v, v' =
+      begin
+        let open Utilities.Result in
+        let* tx = S.start conn in
+        let* v = S.get tx key in
+        let* () = S.put tx key blob in
+        let* v' = S.get tx key in
+        Ok Concepts.Representation.(Option.map value_of_blob v, Option.map value_of_blob v')
+      end
+      |> Helpers.condition_as_failure
+    in
+    check (option Helpers.value) "`get` before `put` should return no value" None v;
+    check (option Helpers.value) "`get` after `put` should return the inserted value" (Some value)
+      v'
+
+  let suite prefix =
+    ( "storage/" ^ prefix,
+      [test_case "storage-and-retrieval" `Quick (with_connection storage_and_retrieval)] )
+end
+
+module LMDB_Configurator : CONFIGURATOR = struct
+  let configure base =
+    let open Sexplib.Sexp in
+    List [Atom "lmdb"; List [Atom "path"; Atom base]; List [Atom "mode"; Atom "420"]]
+    |> Rnt.Concepts.Configuration.term_of_sexp
+end
+
+module LMDB = Make (Rnt.Backend.Storage.LMDB) (LMDB_Configurator)
+
+let suites () = [LMDB.suite "lmdb"]