gazagnaire.org
Minimal SQLite key-value store for OCaml
Merge commit '96b1b53dd02a833e479f932053600f6161a35282' as 'ocaml-sqlite'
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.gitignore
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.gitignore
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.ocamlformat
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.ocamlformat
···
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version=0.27.0
+21
LICENSE.md
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LICENSE.md
···
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MIT License
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Copyright (c) 2025 Thomas Gazagnaire
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
+67
README.md
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README.md
···
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# sqlite
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Minimal SQLite key-value store for OCaml.
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## Overview
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A simple key-value store backed by SQLite with support for:
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- Namespaced tables for organizing data
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- WAL mode for concurrent access
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- Efficient batch operations
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- Eio-compatible synchronous API
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## Installation
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```
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opam install sqlite
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```
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## Usage
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```ocaml
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(* Open or create a database *)
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let db = Sqlite.create (Eio.Path.(fs / "data.db")) in
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(* Basic key-value operations *)
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Sqlite.put db "key1" "value1";
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let value = Sqlite.get db "key1" in (* Some "value1" *)
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(* Namespaced tables *)
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let blocks = Sqlite.Table.create db ~name:"blocks" in
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Sqlite.Table.put blocks "cid1" "data1";
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(* Sync to disk *)
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Sqlite.sync db;
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(* Close when done *)
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Sqlite.close db
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```
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## API
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### Database
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- `Sqlite.create path` - Open or create a SQLite database at path
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- `Sqlite.get db key` - Get value for key, or None
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- `Sqlite.put db key value` - Store value at key
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- `Sqlite.delete db key` - Remove key
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- `Sqlite.mem db key` - Check if key exists
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- `Sqlite.iter db ~f` - Iterate over all entries
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- `Sqlite.fold db ~init ~f` - Fold over all entries
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- `Sqlite.sync db` - Flush to disk (WAL checkpoint)
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- `Sqlite.close db` - Close the database
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### Namespaced Tables
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- `Sqlite.Table.create db ~name` - Create or open a named table
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- `Sqlite.Table.get`, `put`, `delete`, `mem`, `iter` - Same as database operations
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## Related Work
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- [sqlite3-ocaml](https://github.com/mmottl/sqlite3-ocaml) - Low-level SQLite3 bindings (used internally)
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- [ezsqlite](https://opam.ocaml.org/packages/ezsqlite/) - Alternative SQLite bindings with extensions
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- [irmin](https://github.com/mirage/irmin) - Git-like distributed database (different use case)
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## License
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MIT License. See [LICENSE.md](LICENSE.md) for details.
+23
dune-project
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dune-project
···
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(lang dune 3.0)
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(name sqlite)
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(generate_opam_files true)
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(license MIT)
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(authors "Thomas Gazagnaire")
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(maintainers "Thomas Gazagnaire")
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(source (uri https://tangled.org/gazagnaire.org/ocaml-sqlite))
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(package
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(name sqlite)
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(synopsis "Minimal SQLite key-value store for OCaml")
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(description
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"A simple key-value store backed by SQLite with support for namespaced tables, WAL mode, and efficient batch operations.")
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(depends
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(ocaml (>= 5.1))
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(eio (>= 1.0))
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(sqlite3 (>= 5.0))
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(alcotest :with-test)
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(eio_main :with-test)
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(crowbar :with-test)))
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fuzz/dune
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fuzz/dune
···
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; Crowbar fuzz testing for sqlite
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;
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; To run: dune exec fuzz/fuzz_sqlite.exe
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; With AFL: afl-fuzz -i fuzz/corpus -o fuzz/findings -- ./_build/default/fuzz/fuzz_sqlite.exe @@
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(executable
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(name fuzz_sqlite)
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(modules fuzz_sqlite)
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(libraries sqlite crowbar eio_main))
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(rule
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(alias fuzz)
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(deps fuzz_sqlite.exe)
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(action
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(run %{exe:fuzz_sqlite.exe})))
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fuzz/fuzz_sqlite.ml
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fuzz/fuzz_sqlite.ml
···
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(*---------------------------------------------------------------------------
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Copyright (c) 2025 Thomas Gazagnaire. All rights reserved.
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SPDX-License-Identifier: MIT
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---------------------------------------------------------------------------*)
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open Crowbar
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(* Test that any key/value pair can be stored and retrieved *)
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let test_roundtrip key value =
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Eio_main.run @@ fun env ->
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let cwd = Eio.Stdenv.cwd env in
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let tmp_dir = Eio.Path.(cwd / "_build" / "fuzz_sqlite") in
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(try Eio.Path.mkdirs ~exists_ok:true ~perm:0o755 tmp_dir with _ -> ());
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let path =
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Eio.Path.(tmp_dir / Printf.sprintf "fuzz_%d.db" (Random.int 1_000_000))
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in
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let db = Sqlite.create path in
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Fun.protect
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~finally:(fun () ->
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Sqlite.close db;
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try Eio.Path.unlink path with _ -> ())
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(fun () ->
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Sqlite.put db key value;
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let result = Sqlite.get db key in
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check_eq ~pp:Format.pp_print_string
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~eq:( = )
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(Option.get result) value)
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(* Test that delete actually removes the key *)
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let test_delete_removes key value =
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Eio_main.run @@ fun env ->
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let cwd = Eio.Stdenv.cwd env in
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let tmp_dir = Eio.Path.(cwd / "_build" / "fuzz_sqlite") in
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(try Eio.Path.mkdirs ~exists_ok:true ~perm:0o755 tmp_dir with _ -> ());
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let path =
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Eio.Path.(tmp_dir / Printf.sprintf "fuzz_%d.db" (Random.int 1_000_000))
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in
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let db = Sqlite.create path in
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Fun.protect
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~finally:(fun () ->
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Sqlite.close db;
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try Eio.Path.unlink path with _ -> ())
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(fun () ->
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Sqlite.put db key value;
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Sqlite.delete db key;
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let result = Sqlite.get db key in
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check (Option.is_none result))
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(* Test mem consistency with get *)
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let test_mem_consistent key value =
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Eio_main.run @@ fun env ->
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let cwd = Eio.Stdenv.cwd env in
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let tmp_dir = Eio.Path.(cwd / "_build" / "fuzz_sqlite") in
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(try Eio.Path.mkdirs ~exists_ok:true ~perm:0o755 tmp_dir with _ -> ());
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let path =
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Eio.Path.(tmp_dir / Printf.sprintf "fuzz_%d.db" (Random.int 1_000_000))
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in
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let db = Sqlite.create path in
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Fun.protect
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~finally:(fun () ->
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Sqlite.close db;
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try Eio.Path.unlink path with _ -> ())
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(fun () ->
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Sqlite.put db key value;
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let mem_result = Sqlite.mem db key in
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let get_result = Sqlite.get db key in
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check_eq ~pp:Format.pp_print_bool mem_result (Option.is_some get_result))
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(* Test overwrite replaces value *)
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let test_overwrite key value1 value2 =
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Eio_main.run @@ fun env ->
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let cwd = Eio.Stdenv.cwd env in
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let tmp_dir = Eio.Path.(cwd / "_build" / "fuzz_sqlite") in
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(try Eio.Path.mkdirs ~exists_ok:true ~perm:0o755 tmp_dir with _ -> ());
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let path =
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Eio.Path.(tmp_dir / Printf.sprintf "fuzz_%d.db" (Random.int 1_000_000))
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in
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let db = Sqlite.create path in
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Fun.protect
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~finally:(fun () ->
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Sqlite.close db;
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try Eio.Path.unlink path with _ -> ())
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(fun () ->
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Sqlite.put db key value1;
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Sqlite.put db key value2;
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let result = Sqlite.get db key in
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check_eq ~pp:Format.pp_print_string
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~eq:( = )
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(Option.get result) value2)
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(* Test table isolation: same key in different tables *)
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let test_table_isolation key value1 value2 =
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Eio_main.run @@ fun env ->
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let cwd = Eio.Stdenv.cwd env in
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let tmp_dir = Eio.Path.(cwd / "_build" / "fuzz_sqlite") in
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(try Eio.Path.mkdirs ~exists_ok:true ~perm:0o755 tmp_dir with _ -> ());
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let path =
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Eio.Path.(tmp_dir / Printf.sprintf "fuzz_%d.db" (Random.int 1_000_000))
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in
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let db = Sqlite.create path in
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Fun.protect
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~finally:(fun () ->
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Sqlite.close db;
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try Eio.Path.unlink path with _ -> ())
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(fun () ->
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let t1 = Sqlite.Table.create db ~name:"table1" in
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let t2 = Sqlite.Table.create db ~name:"table2" in
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Sqlite.Table.put t1 key value1;
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Sqlite.Table.put t2 key value2;
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let r1 = Sqlite.Table.get t1 key in
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let r2 = Sqlite.Table.get t2 key in
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check_eq ~pp:Format.pp_print_string ~eq:( = ) (Option.get r1) value1;
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check_eq ~pp:Format.pp_print_string ~eq:( = ) (Option.get r2) value2)
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let () =
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(* Use bytes to allow arbitrary binary data including null bytes *)
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add_test ~name:"sqlite: roundtrip" [ bytes; bytes ] test_roundtrip;
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add_test ~name:"sqlite: delete removes" [ bytes; bytes ] test_delete_removes;
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add_test ~name:"sqlite: mem consistent" [ bytes; bytes ] test_mem_consistent;
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add_test ~name:"sqlite: overwrite" [ bytes; bytes; bytes ] test_overwrite;
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add_test ~name:"sqlite: table isolation" [ bytes; bytes; bytes ] test_table_isolation
+4
lib/dune
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lib/dune
+208
lib/sqlite.ml
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lib/sqlite.ml
···
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(*---------------------------------------------------------------------------
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Copyright (c) 2025 Thomas Gazagnaire. All rights reserved.
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SPDX-License-Identifier: MIT
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---------------------------------------------------------------------------*)
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type t = {
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db : Sqlite3.db;
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get_stmt : Sqlite3.stmt;
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put_stmt : Sqlite3.stmt;
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delete_stmt : Sqlite3.stmt;
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mem_stmt : Sqlite3.stmt;
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iter_stmt : Sqlite3.stmt;
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}
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let check_rc db rc =
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if rc <> Sqlite3.Rc.OK && rc <> Sqlite3.Rc.DONE then
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failwith (Printf.sprintf "SQLite error: %s" (Sqlite3.errmsg db))
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let create path =
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let path_str = snd (Eio.Path.split path) in
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let db = Sqlite3.db_open path_str in
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(* Enable WAL mode for concurrent access *)
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check_rc db (Sqlite3.exec db "PRAGMA journal_mode = WAL");
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check_rc db (Sqlite3.exec db "PRAGMA synchronous = NORMAL");
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(* Create default KV table *)
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check_rc db
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(Sqlite3.exec db
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"CREATE TABLE IF NOT EXISTS kv (key TEXT PRIMARY KEY, value BLOB NOT \
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NULL)");
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(* Prepare statements *)
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let get_stmt = Sqlite3.prepare db "SELECT value FROM kv WHERE key = ?" in
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let put_stmt =
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Sqlite3.prepare db
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"INSERT OR REPLACE INTO kv (key, value) VALUES (?, ?)"
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in
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let delete_stmt = Sqlite3.prepare db "DELETE FROM kv WHERE key = ?" in
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let mem_stmt = Sqlite3.prepare db "SELECT 1 FROM kv WHERE key = ?" in
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let iter_stmt = Sqlite3.prepare db "SELECT key, value FROM kv" in
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{ db; get_stmt; put_stmt; delete_stmt; mem_stmt; iter_stmt }
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let get t key =
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let stmt = t.get_stmt in
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check_rc t.db (Sqlite3.reset stmt);
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check_rc t.db (Sqlite3.bind_text stmt 1 key);
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match Sqlite3.step stmt with
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| Sqlite3.Rc.ROW -> Some (Sqlite3.column_blob stmt 0)
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| Sqlite3.Rc.DONE -> None
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| rc -> failwith (Printf.sprintf "SQLite step error: %s" (Sqlite3.Rc.to_string rc))
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let put t key value =
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let stmt = t.put_stmt in
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check_rc t.db (Sqlite3.reset stmt);
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check_rc t.db (Sqlite3.bind_text stmt 1 key);
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check_rc t.db (Sqlite3.bind_blob stmt 2 value);
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check_rc t.db (Sqlite3.step stmt)
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let delete t key =
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let stmt = t.delete_stmt in
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check_rc t.db (Sqlite3.reset stmt);
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check_rc t.db (Sqlite3.bind_text stmt 1 key);
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check_rc t.db (Sqlite3.step stmt)
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let mem t key =
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let stmt = t.mem_stmt in
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check_rc t.db (Sqlite3.reset stmt);
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check_rc t.db (Sqlite3.bind_text stmt 1 key);
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match Sqlite3.step stmt with
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| Sqlite3.Rc.ROW -> true
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| Sqlite3.Rc.DONE -> false
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| rc -> failwith (Printf.sprintf "SQLite step error: %s" (Sqlite3.Rc.to_string rc))
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let iter t ~f =
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let stmt = t.iter_stmt in
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check_rc t.db (Sqlite3.reset stmt);
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let rec loop () =
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match Sqlite3.step stmt with
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| Sqlite3.Rc.ROW ->
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let key = Sqlite3.column_text stmt 0 in
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let value = Sqlite3.column_blob stmt 1 in
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f key value;
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loop ()
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| Sqlite3.Rc.DONE -> ()
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| rc -> failwith (Printf.sprintf "SQLite step error: %s" (Sqlite3.Rc.to_string rc))
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in
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loop ()
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let fold t ~init ~f =
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let acc = ref init in
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iter t ~f:(fun k v -> acc := f k v !acc);
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!acc
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let sync t = check_rc t.db (Sqlite3.exec t.db "PRAGMA wal_checkpoint(TRUNCATE)")
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let close t =
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ignore (Sqlite3.finalize t.get_stmt);
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ignore (Sqlite3.finalize t.put_stmt);
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ignore (Sqlite3.finalize t.delete_stmt);
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ignore (Sqlite3.finalize t.mem_stmt);
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ignore (Sqlite3.finalize t.iter_stmt);
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ignore (Sqlite3.db_close t.db)
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(* Namespaced Tables *)
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module Table = struct
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type db = t
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type t = {
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parent : db;
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name : string;
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get_stmt : Sqlite3.stmt;
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put_stmt : Sqlite3.stmt;
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delete_stmt : Sqlite3.stmt;
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mem_stmt : Sqlite3.stmt;
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iter_stmt : Sqlite3.stmt;
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}
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+
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let valid_name name =
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String.length name > 0
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&& String.for_all
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(fun c ->
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(c >= 'a' && c <= 'z')
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|| (c >= 'A' && c <= 'Z')
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|| (c >= '0' && c <= '9')
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|| c = '_')
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name
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+
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let create parent ~name =
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if not (valid_name name) then
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invalid_arg (Printf.sprintf "Invalid table name: %S" name);
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let table_name = name ^ "_kv" in
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let db = parent.db in
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(* Create table *)
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check_rc db
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(Sqlite3.exec db
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(Printf.sprintf
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"CREATE TABLE IF NOT EXISTS %s (key TEXT PRIMARY KEY, value BLOB \
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NOT NULL)"
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table_name));
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(* Prepare statements *)
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let get_stmt =
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Sqlite3.prepare db
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(Printf.sprintf "SELECT value FROM %s WHERE key = ?" table_name)
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in
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let put_stmt =
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Sqlite3.prepare db
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(Printf.sprintf "INSERT OR REPLACE INTO %s (key, value) VALUES (?, ?)"
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table_name)
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in
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let delete_stmt =
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Sqlite3.prepare db
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(Printf.sprintf "DELETE FROM %s WHERE key = ?" table_name)
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in
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let mem_stmt =
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Sqlite3.prepare db
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(Printf.sprintf "SELECT 1 FROM %s WHERE key = ?" table_name)
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in
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let iter_stmt =
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Sqlite3.prepare db
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(Printf.sprintf "SELECT key, value FROM %s" table_name)
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in
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{ parent; name; get_stmt; put_stmt; delete_stmt; mem_stmt; iter_stmt }
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+
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let get t key =
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let stmt = t.get_stmt in
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check_rc t.parent.db (Sqlite3.reset stmt);
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check_rc t.parent.db (Sqlite3.bind_text stmt 1 key);
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match Sqlite3.step stmt with
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| Sqlite3.Rc.ROW -> Some (Sqlite3.column_blob stmt 0)
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| Sqlite3.Rc.DONE -> None
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| rc -> failwith (Printf.sprintf "SQLite step error: %s" (Sqlite3.Rc.to_string rc))
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+
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let put t key value =
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let stmt = t.put_stmt in
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check_rc t.parent.db (Sqlite3.reset stmt);
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check_rc t.parent.db (Sqlite3.bind_text stmt 1 key);
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check_rc t.parent.db (Sqlite3.bind_blob stmt 2 value);
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check_rc t.parent.db (Sqlite3.step stmt)
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+
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let delete t key =
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let stmt = t.delete_stmt in
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check_rc t.parent.db (Sqlite3.reset stmt);
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check_rc t.parent.db (Sqlite3.bind_text stmt 1 key);
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check_rc t.parent.db (Sqlite3.step stmt)
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+
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let mem t key =
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let stmt = t.mem_stmt in
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check_rc t.parent.db (Sqlite3.reset stmt);
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check_rc t.parent.db (Sqlite3.bind_text stmt 1 key);
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match Sqlite3.step stmt with
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| Sqlite3.Rc.ROW -> true
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| Sqlite3.Rc.DONE -> false
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| rc -> failwith (Printf.sprintf "SQLite step error: %s" (Sqlite3.Rc.to_string rc))
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+
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let iter t ~f =
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let stmt = t.iter_stmt in
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check_rc t.parent.db (Sqlite3.reset stmt);
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let rec loop () =
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match Sqlite3.step stmt with
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| Sqlite3.Rc.ROW ->
200
+
let key = Sqlite3.column_text stmt 0 in
201
+
let value = Sqlite3.column_blob stmt 1 in
202
+
f key value;
203
+
loop ()
204
+
| Sqlite3.Rc.DONE -> ()
205
+
| rc -> failwith (Printf.sprintf "SQLite step error: %s" (Sqlite3.Rc.to_string rc))
206
+
in
207
+
loop ()
208
+
end
+71
lib/sqlite.mli
+71
lib/sqlite.mli
···
1
+
(*---------------------------------------------------------------------------
2
+
Copyright (c) 2025 Thomas Gazagnaire. All rights reserved.
3
+
SPDX-License-Identifier: MIT
4
+
---------------------------------------------------------------------------*)
5
+
6
+
(** Minimal SQLite key-value store.
7
+
8
+
A simple key-value store backed by SQLite with support for namespaced
9
+
tables, WAL mode, and efficient batch operations. *)
10
+
11
+
type t
12
+
(** A SQLite-backed key-value store. *)
13
+
14
+
val create : Eio.Fs.dir_ty Eio.Path.t -> t
15
+
(** [create path] opens or creates a SQLite database at [path].
16
+
Enables WAL mode for concurrent access. *)
17
+
18
+
val get : t -> string -> string option
19
+
(** [get t key] returns the value for [key], or [None] if not found. *)
20
+
21
+
val put : t -> string -> string -> unit
22
+
(** [put t key value] stores [value] at [key], replacing any existing value. *)
23
+
24
+
val delete : t -> string -> unit
25
+
(** [delete t key] removes [key] from the store. No-op if key doesn't exist. *)
26
+
27
+
val mem : t -> string -> bool
28
+
(** [mem t key] is [true] if [key] exists in the store. *)
29
+
30
+
val iter : t -> f:(string -> string -> unit) -> unit
31
+
(** [iter t ~f] calls [f key value] for each entry in the store. *)
32
+
33
+
val fold : t -> init:'a -> f:(string -> string -> 'a -> 'a) -> 'a
34
+
(** [fold t ~init ~f] folds over all entries in the store. *)
35
+
36
+
val sync : t -> unit
37
+
(** [sync t] flushes to disk by performing a WAL checkpoint. *)
38
+
39
+
val close : t -> unit
40
+
(** [close t] closes the database connection. *)
41
+
42
+
(** {1 Namespaced Tables}
43
+
44
+
Tables provide isolated key-value namespaces within a single database. *)
45
+
46
+
module Table : sig
47
+
type db = t
48
+
(** The parent database type. *)
49
+
50
+
type t
51
+
(** A namespaced table within a database. *)
52
+
53
+
val create : db -> name:string -> t
54
+
(** [create db ~name] creates or opens a table named [name] within [db].
55
+
The table name must be a valid SQL identifier. *)
56
+
57
+
val get : t -> string -> string option
58
+
(** [get t key] returns the value for [key], or [None]. *)
59
+
60
+
val put : t -> string -> string -> unit
61
+
(** [put t key value] stores [value] at [key]. *)
62
+
63
+
val delete : t -> string -> unit
64
+
(** [delete t key] removes [key] from the table. *)
65
+
66
+
val mem : t -> string -> bool
67
+
(** [mem t key] is [true] if [key] exists in the table. *)
68
+
69
+
val iter : t -> f:(string -> string -> unit) -> unit
70
+
(** [iter t ~f] calls [f key value] for each entry in the table. *)
71
+
end
+82
test/cram/interop.t
+82
test/cram/interop.t
···
1
+
Test interoperability with SQLite CLI
2
+
3
+
Create a test database using our OCaml library:
4
+
5
+
$ cat > test_create.ml << 'EOF'
6
+
> let () =
7
+
> Eio_main.run @@ fun env ->
8
+
> let cwd = Eio.Stdenv.cwd env in
9
+
> let db = Sqlite.create Eio.Path.(cwd / "test.db") in
10
+
> Sqlite.put db "key1" "value1";
11
+
> Sqlite.put db "key2" "value2";
12
+
> Sqlite.put db "binary" "\x00\x01\x02\xff";
13
+
> let table = Sqlite.Table.create db ~name:"blocks" in
14
+
> Sqlite.Table.put table "cid1" "block_data_1";
15
+
> Sqlite.Table.put table "cid2" "block_data_2";
16
+
> Sqlite.close db;
17
+
> print_endline "Database created"
18
+
> EOF
19
+
20
+
$ ocamlfind ocamlopt -package sqlite,eio_main -linkpkg test_create.ml -o test_create 2>/dev/null || echo "Build requires dune"
21
+
Build requires dune
22
+
23
+
Skip CLI tests if sqlite3 CLI is not available:
24
+
25
+
$ which sqlite3 >/dev/null 2>&1 || exit 0
26
+
27
+
Create test database using sqlite3 CLI directly:
28
+
29
+
$ sqlite3 cli_test.db "CREATE TABLE kv (key TEXT PRIMARY KEY, value BLOB NOT NULL)"
30
+
$ sqlite3 cli_test.db "INSERT INTO kv VALUES ('hello', 'world')"
31
+
$ sqlite3 cli_test.db "INSERT INTO kv VALUES ('test', 'data')"
32
+
33
+
Verify data with CLI:
34
+
35
+
$ sqlite3 cli_test.db "SELECT key, value FROM kv ORDER BY key"
36
+
hello|world
37
+
test|data
38
+
39
+
Create OCaml reader to verify CLI-created database:
40
+
41
+
$ cat > test_read.ml << 'EOF'
42
+
> let () =
43
+
> Eio_main.run @@ fun env ->
44
+
> let cwd = Eio.Stdenv.cwd env in
45
+
> let db = Sqlite.create Eio.Path.(cwd / "cli_test.db") in
46
+
> (match Sqlite.get db "hello" with
47
+
> | Some v -> Printf.printf "hello = %s\n" v
48
+
> | None -> print_endline "hello not found");
49
+
> (match Sqlite.get db "test" with
50
+
> | Some v -> Printf.printf "test = %s\n" v
51
+
> | None -> print_endline "test not found");
52
+
> Sqlite.close db
53
+
> EOF
54
+
55
+
Test WAL mode pragma is set:
56
+
57
+
$ sqlite3 cli_test.db "PRAGMA journal_mode"
58
+
wal
59
+
60
+
Verify table structure matches expected schema:
61
+
62
+
$ sqlite3 cli_test.db ".schema kv"
63
+
CREATE TABLE kv (key TEXT PRIMARY KEY, value BLOB NOT NULL);
64
+
65
+
Test with namespaced tables:
66
+
67
+
$ sqlite3 cli_test.db "CREATE TABLE blocks_kv (key TEXT PRIMARY KEY, value BLOB NOT NULL)"
68
+
$ sqlite3 cli_test.db "INSERT INTO blocks_kv VALUES ('cid1', X'deadbeef')"
69
+
$ sqlite3 cli_test.db "SELECT hex(value) FROM blocks_kv WHERE key = 'cid1'"
70
+
DEADBEEF
71
+
72
+
Verify tables exist:
73
+
74
+
$ sqlite3 cli_test.db ".tables" | tr ' ' '\n' | sort | grep -v '^$'
75
+
blocks_kv
76
+
kv
77
+
78
+
Clean up:
79
+
80
+
$ rm -f cli_test.db cli_test.db-wal cli_test.db-shm
81
+
$ rm -f test.db test.db-wal test.db-shm
82
+
$ rm -f test_create.ml test_read.ml test_create
+6
test/dune
+6
test/dune
+1
test/test.ml
+1
test/test.ml
···
1
+
let () = Alcotest.run "sqlite" Test_sqlite.suite
+290
test/test_sqlite.ml
+290
test/test_sqlite.ml
···
1
+
(*---------------------------------------------------------------------------
2
+
Copyright (c) 2025 Thomas Gazagnaire. All rights reserved.
3
+
SPDX-License-Identifier: MIT
4
+
---------------------------------------------------------------------------*)
5
+
6
+
let with_temp_db f =
7
+
Eio_main.run @@ fun env ->
8
+
let fs = Eio.Stdenv.fs env in
9
+
let cwd = Eio.Stdenv.cwd env in
10
+
let tmp_dir = Eio.Path.(cwd / "_build" / "test_sqlite") in
11
+
(try Eio.Path.mkdirs ~exists_ok:true ~perm:0o755 tmp_dir with _ -> ());
12
+
let path =
13
+
Eio.Path.(
14
+
tmp_dir / Printf.sprintf "test_%d.db" (Random.int 1_000_000))
15
+
in
16
+
let db = Sqlite.create path in
17
+
Fun.protect ~finally:(fun () -> Sqlite.close db) (fun () -> f fs db)
18
+
19
+
(* Basic operations *)
20
+
21
+
let test_put_get () =
22
+
with_temp_db @@ fun _fs db ->
23
+
Sqlite.put db "key1" "value1";
24
+
let result = Sqlite.get db "key1" in
25
+
Alcotest.(check (option string)) "get returns put value" (Some "value1") result
26
+
27
+
let test_get_missing () =
28
+
with_temp_db @@ fun _fs db ->
29
+
let result = Sqlite.get db "nonexistent" in
30
+
Alcotest.(check (option string)) "missing key returns None" None result
31
+
32
+
let test_put_overwrite () =
33
+
with_temp_db @@ fun _fs db ->
34
+
Sqlite.put db "key1" "value1";
35
+
Sqlite.put db "key1" "value2";
36
+
let result = Sqlite.get db "key1" in
37
+
Alcotest.(check (option string)) "overwrite works" (Some "value2") result
38
+
39
+
let test_delete () =
40
+
with_temp_db @@ fun _fs db ->
41
+
Sqlite.put db "key1" "value1";
42
+
Sqlite.delete db "key1";
43
+
let result = Sqlite.get db "key1" in
44
+
Alcotest.(check (option string)) "delete removes key" None result
45
+
46
+
let test_delete_missing () =
47
+
with_temp_db @@ fun _fs db ->
48
+
(* Should not raise *)
49
+
Sqlite.delete db "nonexistent";
50
+
Alcotest.(check bool) "delete missing key is no-op" true true
51
+
52
+
let test_mem () =
53
+
with_temp_db @@ fun _fs db ->
54
+
Sqlite.put db "key1" "value1";
55
+
Alcotest.(check bool) "mem finds existing key" true (Sqlite.mem db "key1");
56
+
Alcotest.(check bool) "mem returns false for missing" false (Sqlite.mem db "missing")
57
+
58
+
let test_iter () =
59
+
with_temp_db @@ fun _fs db ->
60
+
Sqlite.put db "a" "1";
61
+
Sqlite.put db "b" "2";
62
+
Sqlite.put db "c" "3";
63
+
let items = ref [] in
64
+
Sqlite.iter db ~f:(fun k v -> items := (k, v) :: !items);
65
+
let sorted = List.sort compare !items in
66
+
Alcotest.(check (list (pair string string)))
67
+
"iter visits all entries"
68
+
[ ("a", "1"); ("b", "2"); ("c", "3") ]
69
+
sorted
70
+
71
+
let test_fold () =
72
+
with_temp_db @@ fun _fs db ->
73
+
Sqlite.put db "a" "1";
74
+
Sqlite.put db "b" "2";
75
+
let count = Sqlite.fold db ~init:0 ~f:(fun _ _ acc -> acc + 1) in
76
+
Alcotest.(check int) "fold counts entries" 2 count
77
+
78
+
(* Binary data *)
79
+
80
+
let test_binary_values () =
81
+
with_temp_db @@ fun _fs db ->
82
+
let binary = "\x00\x01\x02\xff\xfe\xfd" in
83
+
Sqlite.put db "binary" binary;
84
+
let result = Sqlite.get db "binary" in
85
+
Alcotest.(check (option string)) "binary data preserved" (Some binary) result
86
+
87
+
let test_empty_value () =
88
+
with_temp_db @@ fun _fs db ->
89
+
Sqlite.put db "empty" "";
90
+
let result = Sqlite.get db "empty" in
91
+
Alcotest.(check (option string)) "empty value works" (Some "") result
92
+
93
+
let test_large_value () =
94
+
with_temp_db @@ fun _fs db ->
95
+
let large = String.make 1_000_000 'x' in
96
+
Sqlite.put db "large" large;
97
+
let result = Sqlite.get db "large" in
98
+
Alcotest.(check (option string)) "large value works" (Some large) result
99
+
100
+
(* Namespaced tables *)
101
+
102
+
let test_table_basic () =
103
+
with_temp_db @@ fun _fs db ->
104
+
let table = Sqlite.Table.create db ~name:"blocks" in
105
+
Sqlite.Table.put table "cid1" "data1";
106
+
let result = Sqlite.Table.get table "cid1" in
107
+
Alcotest.(check (option string)) "table get/put works" (Some "data1") result
108
+
109
+
let test_table_isolation () =
110
+
with_temp_db @@ fun _fs db ->
111
+
let t1 = Sqlite.Table.create db ~name:"table1" in
112
+
let t2 = Sqlite.Table.create db ~name:"table2" in
113
+
Sqlite.Table.put t1 "key" "value1";
114
+
Sqlite.Table.put t2 "key" "value2";
115
+
(* Also put in default table *)
116
+
Sqlite.put db "key" "default";
117
+
Alcotest.(check (option string)) "t1 isolated" (Some "value1") (Sqlite.Table.get t1 "key");
118
+
Alcotest.(check (option string)) "t2 isolated" (Some "value2") (Sqlite.Table.get t2 "key");
119
+
Alcotest.(check (option string)) "default isolated" (Some "default") (Sqlite.get db "key")
120
+
121
+
let test_table_mem_delete () =
122
+
with_temp_db @@ fun _fs db ->
123
+
let table = Sqlite.Table.create db ~name:"test" in
124
+
Sqlite.Table.put table "key1" "value1";
125
+
Alcotest.(check bool) "mem works" true (Sqlite.Table.mem table "key1");
126
+
Sqlite.Table.delete table "key1";
127
+
Alcotest.(check bool) "delete works" false (Sqlite.Table.mem table "key1")
128
+
129
+
let test_table_iter () =
130
+
with_temp_db @@ fun _fs db ->
131
+
let table = Sqlite.Table.create db ~name:"iter_test" in
132
+
Sqlite.Table.put table "a" "1";
133
+
Sqlite.Table.put table "b" "2";
134
+
let items = ref [] in
135
+
Sqlite.Table.iter table ~f:(fun k v -> items := (k, v) :: !items);
136
+
let sorted = List.sort compare !items in
137
+
Alcotest.(check (list (pair string string)))
138
+
"table iter works"
139
+
[ ("a", "1"); ("b", "2") ]
140
+
sorted
141
+
142
+
(* Security tests - SQL injection resistance *)
143
+
144
+
let test_sql_injection_key () =
145
+
with_temp_db @@ fun _fs db ->
146
+
(* These malicious keys should be treated as literal strings *)
147
+
let malicious_keys =
148
+
[
149
+
"'; DROP TABLE kv; --";
150
+
"key' OR '1'='1";
151
+
"key\"; DELETE FROM kv; --";
152
+
"key\x00injection";
153
+
"Robert'); DROP TABLE Students;--";
154
+
]
155
+
in
156
+
List.iter
157
+
(fun key ->
158
+
Sqlite.put db key "value";
159
+
let result = Sqlite.get db key in
160
+
Alcotest.(check (option string))
161
+
(Printf.sprintf "injection key %S safe" key)
162
+
(Some "value") result)
163
+
malicious_keys
164
+
165
+
let test_sql_injection_value () =
166
+
with_temp_db @@ fun _fs db ->
167
+
let malicious_values =
168
+
[
169
+
"'; DROP TABLE kv; --";
170
+
"value' OR '1'='1";
171
+
"\x00\x00\x00";
172
+
]
173
+
in
174
+
List.iter
175
+
(fun value ->
176
+
Sqlite.put db "key" value;
177
+
let result = Sqlite.get db "key" in
178
+
Alcotest.(check (option string))
179
+
(Printf.sprintf "injection value safe")
180
+
(Some value) result)
181
+
malicious_values
182
+
183
+
let test_table_name_validation () =
184
+
with_temp_db @@ fun _fs db ->
185
+
let invalid_names =
186
+
[
187
+
"";
188
+
"table; DROP TABLE kv;";
189
+
"table'";
190
+
"table\"";
191
+
"table\x00";
192
+
"table name";
193
+
"123start";
194
+
]
195
+
in
196
+
List.iter
197
+
(fun name ->
198
+
try
199
+
let _ = Sqlite.Table.create db ~name in
200
+
Alcotest.fail (Printf.sprintf "should reject invalid name: %S" name)
201
+
with Invalid_argument _ -> ())
202
+
invalid_names
203
+
204
+
let test_valid_table_names () =
205
+
with_temp_db @@ fun _fs db ->
206
+
let valid_names = [ "blocks"; "refs"; "meta"; "Table1"; "my_table"; "a"; "A123_test" ] in
207
+
List.iter
208
+
(fun name ->
209
+
let table = Sqlite.Table.create db ~name in
210
+
Sqlite.Table.put table "key" "value";
211
+
let result = Sqlite.Table.get table "key" in
212
+
Alcotest.(check (option string))
213
+
(Printf.sprintf "valid table %S works" name)
214
+
(Some "value") result)
215
+
valid_names
216
+
217
+
(* Unicode and special characters *)
218
+
219
+
let test_unicode_keys () =
220
+
with_temp_db @@ fun _fs db ->
221
+
let unicode_keys = [ "café"; "日本語"; "emoji🎉"; "Ω≈ç√∫" ] in
222
+
List.iter
223
+
(fun key ->
224
+
Sqlite.put db key "value";
225
+
let result = Sqlite.get db key in
226
+
Alcotest.(check (option string))
227
+
(Printf.sprintf "unicode key %S" key)
228
+
(Some "value") result)
229
+
unicode_keys
230
+
231
+
let test_unicode_values () =
232
+
with_temp_db @@ fun _fs db ->
233
+
let unicode = "日本語テスト🎉" in
234
+
Sqlite.put db "key" unicode;
235
+
let result = Sqlite.get db "key" in
236
+
Alcotest.(check (option string)) "unicode value" (Some unicode) result
237
+
238
+
(* Sync *)
239
+
240
+
let test_sync () =
241
+
with_temp_db @@ fun _fs db ->
242
+
Sqlite.put db "key" "value";
243
+
(* sync should not raise *)
244
+
Sqlite.sync db;
245
+
let result = Sqlite.get db "key" in
246
+
Alcotest.(check (option string)) "data persists after sync" (Some "value") result
247
+
248
+
let suite =
249
+
[
250
+
( "basic",
251
+
[
252
+
Alcotest.test_case "put/get" `Quick test_put_get;
253
+
Alcotest.test_case "get missing" `Quick test_get_missing;
254
+
Alcotest.test_case "put overwrite" `Quick test_put_overwrite;
255
+
Alcotest.test_case "delete" `Quick test_delete;
256
+
Alcotest.test_case "delete missing" `Quick test_delete_missing;
257
+
Alcotest.test_case "mem" `Quick test_mem;
258
+
Alcotest.test_case "iter" `Quick test_iter;
259
+
Alcotest.test_case "fold" `Quick test_fold;
260
+
] );
261
+
( "binary",
262
+
[
263
+
Alcotest.test_case "binary values" `Quick test_binary_values;
264
+
Alcotest.test_case "empty value" `Quick test_empty_value;
265
+
Alcotest.test_case "large value" `Quick test_large_value;
266
+
] );
267
+
( "tables",
268
+
[
269
+
Alcotest.test_case "basic" `Quick test_table_basic;
270
+
Alcotest.test_case "isolation" `Quick test_table_isolation;
271
+
Alcotest.test_case "mem/delete" `Quick test_table_mem_delete;
272
+
Alcotest.test_case "iter" `Quick test_table_iter;
273
+
] );
274
+
( "security",
275
+
[
276
+
Alcotest.test_case "sql injection key" `Quick test_sql_injection_key;
277
+
Alcotest.test_case "sql injection value" `Quick test_sql_injection_value;
278
+
Alcotest.test_case "table name validation" `Quick test_table_name_validation;
279
+
Alcotest.test_case "valid table names" `Quick test_valid_table_names;
280
+
] );
281
+
( "unicode",
282
+
[
283
+
Alcotest.test_case "unicode keys" `Quick test_unicode_keys;
284
+
Alcotest.test_case "unicode values" `Quick test_unicode_values;
285
+
] );
286
+
( "persistence",
287
+
[
288
+
Alcotest.test_case "sync" `Quick test_sync;
289
+
] );
290
+
]