Make sure clean is worked

db.ts

@@ -90,13 +90,15 @@ export class EhDb {
     flock_enabled: boolean = eval('typeof Deno.flock !== "undefined"');
     file: Deno.FsFile | undefined;
     _exist_table: Set<string> = new Set();
+    #lock_file: string | undefined;
     readonly version = new SemVer("1.0.0-0");
     constructor(base_path: string) {
         this.db = new DB(join(base_path, "data.db"));
         this.db.execute("PRAGMA main.locking_mode=EXCLUSIVE;");
         if (!this._check_database()) this._create_table();
         if (this.flock_enabled) {
-            this.file = Deno.openSync(join(base_path, "db.lock"), {
+            this.#lock_file = join(base_path, "db.lock");
+            this.file = Deno.openSync(this.#lock_file, {
                 create: true,
                 write: true,
             });
@@ -200,7 +202,10 @@ export class EhDb {
     }
     close() {
         this.db.close();
-        if (this.file) this.file.close();
+        if (this.file) {
+            this.file.close();
+            if (this.#lock_file) Deno.remove(this.#lock_file);
+        }
     }
     async commit() {
         while (1) {

main.ts

@@ -45,22 +45,32 @@ if (!check_file_permissions(settings.base)) {
 }
 async function download() {
     const manager = new TaskManager(settings);
-    const urls: ParsedUrl[] = [];
-    for (const i of args._.slice(1)) {
-        const r = parseUrl(i.toString());
-        if (r) urls.push(r);
-    }
-    for (const u of urls) {
-        if (u.type == UrlType.Gallery || u.type == UrlType.MPV) {
-            await manager.add_download_task(u.gid, u.token);
+    try {
+        const urls: ParsedUrl[] = [];
+        for (const i of args._.slice(1)) {
+            const r = parseUrl(i.toString());
+            if (r) urls.push(r);
         }
+        for (const u of urls) {
+            if (u.type == UrlType.Gallery || u.type == UrlType.MPV) {
+                await manager.add_download_task(u.gid, u.token);
+            }
+        }
+        if (args.add_only) {
+            return;
+        }
+        await manager.run();
+    } finally {
+        manager.close();
     }
-    if (args.add_only) return;
-    await manager.run();
 }
 async function run() {
     const manager = new TaskManager(settings);
-    await manager.run();
+    try {
+        await manager.run();
+    } finally {
+        manager.close();
+    }
 }
 async function main() {
     await sure_dir(settings.base);

task_manager.ts

@@ -67,6 +67,9 @@ export class TaskManager {
             this.running_tasks.delete(id);
         }
     }
+    close() {
+        this.db.close();
+    }
     async run() {
         while (1) {
             await this.check_running_tasks();