feat: version 2 beta

adapters/browser/providers/snapshots.ts

@@ -0,0 +1,39 @@
+import type { Collection } from "@valkyr/db";
+
+import type { Snapshot, SnapshotsProvider } from "../../../types/adapter.ts";
+
+export class BrowserSnapshotsProvider implements SnapshotsProvider {
+  constructor(readonly snapshots: Collection<Snapshot>) {}
+
+  /**
+   * Add snapshot state under given reducer stream.
+   *
+   * @param name   - Name of the reducer the snapshot is attached to.
+   * @param stream - Stream the snapshot is attached to.
+   * @param cursor - Cursor timestamp for the last event used in the snapshot.
+   * @param state  - State of the reduced events.
+   */
+  async insert(name: string, stream: string, cursor: string, state: Record<string, unknown>): Promise<void> {
+    await this.snapshots.insertOne({ name, stream, cursor, state });
+  }
+
+  /**
+   * Get snapshot state by stream.
+   *
+   * @param name   - Name of the reducer which the state was created.
+   * @param stream - Stream the state was reduced for.
+   */
+  async getByStream(name: string, stream: string): Promise<Snapshot | undefined> {
+    return this.snapshots.findOne({ name, stream });
+  }
+
+  /**
+   * Removes a snapshot for the given reducer stream.
+   *
+   * @param name   - Name of the reducer the snapshot is attached to.
+   * @param stream - Stream to remove from snapshots.
+   */
+  async remove(name: string, stream: string): Promise<void> {
+    await this.snapshots.remove({ name, stream });
+  }
+}