1 files changed, 47 insertions, 0 deletions
diff --git a/packages/instant/src/util/hearbeats.ts b/packages/instant/src/util/hearbeats.ts
new file mode 100644
index 000000000..19b448bef
--- /dev/null
+++ b/packages/instant/src/util/hearbeats.ts
@@ -0,0 +1,47 @@
+import * as _ from 'lodash';
+
+import { asyncData } from './../redux/async_data';
+import { Store } from './../redux/store';
+
+export class AccountUpdateHeartbeat {
+    private _intervalId?: number;
+    private _pendingRequest?: boolean;
+    private _store?: Store;
+
+    public start(store: Store, intervalTimeMs: number): void {
+        if (!_.isUndefined(this._intervalId)) {
+            throw new Error('Heartbeat is running, please stop before restarting');
+        }
+        this._store = store;
+        // Kick off initial first request
+        this._performActionAsync(true);
+        // Set interval for heartbeat
+        this._intervalId = window.setInterval(this._performActionAsync.bind(this, false), intervalTimeMs);
+    }
+
+    public stop(): void {
+        if (!_.isUndefined(this._intervalId)) {
+            window.clearInterval(this._intervalId);
+            this._resetState();
+        }
+    }
+
+    private _resetState(): void {
+        this._intervalId = undefined;
+        this._pendingRequest = false;
+        this._store = undefined;
+    }
+
+    private async _performActionAsync(setLoading: boolean): Promise<void> {
+        if (this._pendingRequest || _.isUndefined(this._store)) {
+            return;
+        }
+
+        this._pendingRequest = true;
+        try {
+            await asyncData.fetchAccountInfoAndDispatchToStore(this._store, { setLoading });
+        } finally {
+            this._pendingRequest = false;
+        }
+    }
+}