From db17262ea4f7d1736acd842a3afa9f1a19ee39a4 Mon Sep 17 00:00:00 2001
From: Dominik Prokop <dominik.prokop@grafana.com>
Date: Tue, 29 Jan 2019 12:10:03 +0100
Subject: [PATCH] Add util for handling promise cancelation to avoid setting
 state on unmounted components

https://github.com/facebook/react/issues/5465
---
 public/app/core/utils/CancelablePromise.ts | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 public/app/core/utils/CancelablePromise.ts

diff --git a/public/app/core/utils/CancelablePromise.ts b/public/app/core/utils/CancelablePromise.ts
new file mode 100644
index 00000000000..e8c3ec07a28
--- /dev/null
+++ b/public/app/core/utils/CancelablePromise.ts
@@ -0,0 +1,22 @@
+// https://github.com/facebook/react/issues/5465
+
+export interface CancelablePromise<T> {
+  promise: Promise<T>;
+  cancel: () => void;
+}
+
+export const makePromiseCancelable = <T>(promise: Promise<T>): CancelablePromise<T> => {
+  let hasCanceled_ = false;
+
+  const wrappedPromise = new Promise<T>((resolve, reject) => {
+    promise.then(val => (hasCanceled_ ? reject({ isCanceled: true }) : resolve(val)));
+    promise.catch(error => (hasCanceled_ ? reject({ isCanceled: true }) : reject(error)));
+  });
+
+  return {
+    promise: wrappedPromise,
+    cancel() {
+      hasCanceled_ = true;
+    },
+  };
+};