Add size() to BaseDb

packages/db/src/FileFlatDb/index.ts

@@ -74,6 +74,10 @@ export default class FileFlatDb implements BaseDb {
     this._fileSize = fs.fstatSync(this._fd).size;
   }
 
+  size (): number {
+    return this._fileSize;
+  }
+
   rename (base: string, file: string): void {
     assert(this._fd === -1, 'Database cannot be open for renaming');
 

packages/db/src/engines/FileTreeDb.ts

@@ -58,6 +58,12 @@ export default class FileTreeDb implements BaseDb {
     l.error('rename() is not implemented');
   }
 
+  size (): number {
+    l.error('size() is not implemented');
+
+    return 0;
+  }
+
   maintain (fn: ProgressCb): void {
     fn({
       isCompleted: true,

packages/db/src/engines/LruDb.ts

@@ -53,6 +53,10 @@ export default class LruDb implements BaseDb {
     this.backing.maintain(fn);
   }
 
+  size (): number {
+    return this.backing.size();
+  }
+
   del (key: Uint8Array): void {
     const keyStr = key.toString();
 

packages/db/src/engines/MemoryDb.ts

@@ -43,6 +43,12 @@ export default class MemoryDb implements BaseDb {
     });
   }
 
+  size (): number {
+    l.error('size() is not implemented');
+
+    return 0;
+  }
+
   del (key: Uint8Array): void {
     l.debug(() => ['del', { key }]);
 

packages/db/src/engines/TransactionDb.ts

@@ -72,6 +72,10 @@ export default class TransactionDb implements TxDb {
     this.backing.maintain(fn);
   }
 
+  size (): number {
+    return this.backing.size();
+  }
+
   del (key: Uint8Array): void {
     if (this.txStarted) {
       this.txOverlay[key.toString()] = {

packages/db/src/types.d.ts

@@ -18,9 +18,9 @@ export interface BaseDb {
   close (): void;
   open (): void;
   empty (): void;
-  rename (base: string, file: string): void;
-
   maintain (fn: ProgressCb): void;
+  rename (base: string, file: string): void;
+  size (): number;
 
   del (key: Uint8Array): void;
   get (key: Uint8Array): Uint8Array | null;