Use Zig package manager instead of Git submodules

Retrieve TigerBeetle using the Zig package manager instead of using Git
submodules to clone it.
Also remove hardcoded vsr_options struct and use the defaults provided by
TigerBeetle's build.zig (except for release and release_client_min, which are
needed to correctly connect to a cluster)

.github/workflows/main.yml

@@ -19,8 +19,6 @@ jobs:
     steps:
       - name: Clone the repository
         uses: actions/checkout@v4
-        with:
-          submodules: recursive
 
       - name: Install OTP and Elixir
         uses: erlef/setup-beam@v1
@@ -102,8 +100,6 @@ jobs:
     steps:
       - name: Clone the repository
         uses: actions/checkout@v4
-        with:
-          submodules: recursive
 
       - name: Fetch TigerBeetle for Linux
         if: runner.os == 'Linux'

README.md

@@ -13,7 +13,7 @@ The package can be installed by adding `tigerbeetlex` to your list of dependenci
 ```elixir
 def deps do
   [
-    {:tigerbeetlex, github: "rbino/tigerbeetlex", submodules: true}
+    {:tigerbeetlex, github: "rbino/tigerbeetlex"}
   ]
 end
 ```

build.zig

@@ -3,7 +3,7 @@ const std = @import("std");
 // Although this function looks imperative, note that its job is to
 // declaratively construct a build graph that will be executed by an external
 // runner.
-pub fn build(b: *std.Build) void {
+pub fn build(b: *std.Build) !void {
     // Standard target options allows the person running `zig build` to choose
     // what target to build for. Here we do not override the defaults, which
     // means any target is allowed, and the default is native. Other options
@@ -16,7 +16,7 @@ pub fn build(b: *std.Build) void {
     const optimize = b.standardOptimizeOption(.{});
 
     // Get ERTS_INCLUDE_DIR from env, which should be passed by :build_dot_zig
-    const erts_include_dir = std.process.getEnvVarOwned(b.allocator, "ERTS_INCLUDE_DIR") catch blk: {
+    const erts_include_dir = b.graph.env_map.get("ERTS_INCLUDE_DIR") orelse blk: {
         // Fallback to extracting it from the erlang shell so we can also execute zig build manually
         const argv = [_][]const u8{
             "erl",
@@ -31,6 +31,28 @@ pub fn build(b: *std.Build) void {
         break :blk b.run(&argv);
     };
 
+    // This is passed from mix.exs, which extracts it by "parsing" build.zig.zon
+    const release = b.option(
+        []const u8,
+        "tigerbeetle_release",
+        "The release of TigerBeetle targeted by the client",
+    ) orelse {
+        std.log.err("tigerbeetle_release option is required", .{});
+        return error.MissingTigerBeetleRelease;
+    };
+
+    // This is hardcoded in TigerBeetle in src/scripts/release.zig
+    const release_client_min: []const u8 = "0.15.3";
+
+    const opts = .{
+        .target = target,
+        .@"config-release" = release,
+        .@"config-release-client-min" = release_client_min,
+        // The rest of VSR options will use the default value
+        // TODO: should we expose other VSR build options here?
+    };
+    const vsr_mod = b.dependency("tigerbeetle", opts).module("vsr");
+
     const lib = b.addSharedLibrary(.{
         .name = "tigerbeetlex",
         // In this case the main source file is merely a path, however, in more
@@ -41,6 +63,8 @@ pub fn build(b: *std.Build) void {
         .link_libc = true,
     });
     lib.addSystemIncludePath(.{ .cwd_relative = erts_include_dir });
+    // TigerBeetle imports
+    lib.root_module.addImport("vsr", vsr_mod);
     // This is needed to avoid errors on MacOS when loading the NIF
     lib.linker_allow_shlib_undefined = true;
 

build.zig.zon

@@ -0,0 +1,16 @@
+.{
+    // This is currently advisory only; Zig does not yet do anything
+    // with this value.
+    .minimum_zig_version = "0.13.0",
+
+    // Each dependency must either provide a `url` and `hash`, or a `path`.
+    // `zig build --fetch` can be used to fetch all dependencies of a package, recursively.
+    // Once all dependencies are fetched, `zig build` no longer requires
+    // internet connectivity.
+    .dependencies = .{
+        .tigerbeetle = .{
+            .url = "https://github.com/tigerbeetle/tigerbeetle/archive/refs/tags/0.15.4.tar.gz",
+            .hash = "1220df4340b291f24f4bb7346b7ed6fe06109eb79526c56b6ac85738e25519ad2ed7",
+        },
+    },
+}

mix.exs

@@ -1,13 +1,20 @@
 defmodule TigerBeetlex.MixProject do
   use Mix.Project
 
+  @release_regex ~r{https://github.com/tigerbeetle/tigerbeetle/archive/refs/tags/(?<release>[0-9]+\.[0-9]+\.[0-9]+)\.tar\.gz}
+
+  @tigerbeetle_release File.read!("build.zig.zon")
+                       |> then(&Regex.named_captures(@release_regex, &1))
+                       |> Map.fetch!("release")
+
   def project do
     [
       app: :tigerbeetlex,
       version: "0.1.0",
       elixir: "~> 1.14",
       install_zig: "0.13.0",
       zig_build_mode: zig_build_mode(Mix.env()),
+      zig_extra_options: [tigerbeetle_release: @tigerbeetle_release],
       compilers: [:build_dot_zig] ++ Mix.compilers(),
       start_permanent: Mix.env() == :prod,
       dialyzer: [plt_add_apps: [:zig_parser]],

src/account_batch.zig

@@ -5,7 +5,7 @@ const batch = @import("batch.zig");
 const beam = @import("beam.zig");
 const scheduler = beam.scheduler;
 
-const tb = @import("tigerbeetle/src/tigerbeetle.zig");
+const tb = @import("vsr").tigerbeetle;
 const Account = tb.Account;
 const AccountFlags = tb.AccountFlags;
 pub const AccountBatch = batch.Batch(Account);

src/batch.zig

@@ -4,7 +4,7 @@ const RwLock = std.Thread.RwLock;
 const beam = @import("beam.zig");
 const Resource = beam.resource.Resource;
 
-const tb = @import("tigerbeetle/src/tigerbeetle.zig");
+const tb = @import("vsr").tigerbeetle;
 const Account = tb.Account;
 const Transfer = tb.Transfer;
 

src/client.zig

@@ -6,8 +6,8 @@ const process = beam.process;
 const resource = beam.resource;
 const Resource = resource.Resource;
 
-const tb = @import("tigerbeetle/src/tigerbeetle.zig");
-const tb_client = @import("tigerbeetle/src/clients/c/tb_client.zig");
+const tb = @import("vsr").tigerbeetle;
+const tb_client = @import("vsr").tb_client;
 const Account = tb.Account;
 const Transfer = tb.Transfer;
 

src/tigerbeetlex.zig

@@ -17,19 +17,6 @@ const AccountBatchResource = account_batch.AccountBatchResource;
 const IdBatchResource = id_batch.IdBatchResource;
 const TransferBatchResource = transfer_batch.TransferBatchResource;
 
-pub const vsr_options = .{
-    .config_base = .default,
-    .config_log_level = std.log.Level.info,
-    .tracer_backend = .none,
-    .hash_log_mode = .none,
-    .git_commit = null,
-    // TODO: take these from a proper place
-    .release = "0.15.4",
-    .release_client_min = "0.15.4",
-    .config_aof_record = false,
-    .config_aof_recovery = false,
-};
-
 pub const std_options = .{
     .log_level = .err,
 };

src/transfer_batch.zig

@@ -5,7 +5,7 @@ const batch = @import("batch.zig");
 const beam = @import("beam.zig");
 const scheduler = beam.scheduler;
 
-const tb = @import("tigerbeetle/src/tigerbeetle.zig");
+const tb = @import("vsr").tigerbeetle;
 const Transfer = tb.Transfer;
 const TransferFlags = tb.TransferFlags;
 pub const TransferBatch = batch.Batch(Transfer);