feat: implement prepareSqlitePath function and add tests for database path handling

src/db/sqlitePath.test.ts

@@ -0,0 +1,23 @@
+import { mkdtemp, rm } from "node:fs/promises";
+import { existsSync } from "node:fs";
+import { join } from "node:path";
+import { tmpdir } from "node:os";
+import { describe, expect, test } from "bun:test";
+import { prepareSqlitePath } from "./sqlitePath";
+
+describe("prepareSqlitePath", () => {
+  test("creates parent directory for file database urls", async () => {
+    const root = await mkdtemp(join(tmpdir(), "booster-role-db-"));
+    const dbPath = join(root, "nested", "booster-role.sqlite");
+
+    expect(existsSync(join(root, "nested"))).toBe(false);
+    expect(prepareSqlitePath(`file:${dbPath}`)).toBe(dbPath);
+    expect(existsSync(join(root, "nested"))).toBe(true);
+
+    await rm(root, { recursive: true, force: true });
+  });
+
+  test("does not create a directory for in-memory databases", () => {
+    expect(prepareSqlitePath(":memory:")).toBe(":memory:");
+  });
+});

src/db/sqlitePath.ts

@@ -0,0 +1,12 @@
+import { mkdirSync } from "node:fs";
+import { dirname } from "node:path";
+
+export function prepareSqlitePath(databaseUrl: string): string {
+  const sqlitePath = databaseUrl.replace(/^file:/, "");
+
+  if (sqlitePath !== ":memory:") {
+    mkdirSync(dirname(sqlitePath), { recursive: true });
+  }
+
+  return sqlitePath;
+}

src/discord/bot.ts

@@ -1,6 +1,7 @@
 import { Database } from "bun:sqlite";
 import type { Client } from "discord.js";
 import type { AppConfig } from "../config";
+import { prepareSqlitePath } from "../db/sqlitePath";
 import { BoosterRoleService } from "../services/boosterRoleService";
 import { BunSqliteBoosterRoleStore } from "../services/bunSqliteBoosterRoleStore";
 import { DiscordRoleRepository } from "../services/discordRoleRepository";
@@ -8,7 +9,7 @@ import { handleGuildMemberUpdate } from "./events/guildMemberUpdate";
 import { handleInteraction } from "./interactionHandler";
 
 export function attachBotHandlers(client: Client, config: AppConfig): void {
-  const db = new Database(config.databaseUrl.replace(/^file:/, ""));
+  const db = new Database(prepareSqlitePath(config.databaseUrl));
   const store = new BunSqliteBoosterRoleStore(db);
 
   client.on("interactionCreate", async (interaction) => {