1 files changed, 34 insertions, 0 deletions
diff --git a/src/services/promise_interval/promise_interval.js b/src/services/promise_interval/promise_interval.js
new file mode 100644
index 00000000..0c0a66a0
--- /dev/null
+++ b/src/services/promise_interval/promise_interval.js
@@ -0,0 +1,34 @@
+
+// promiseInterval - replacement for setInterval for promises, starts counting
+// the interval only after a promise is done instead of immediately.
+// - promiseCall is a function that returns a promise, it's called the first
+// time after the first interval.
+// - interval is the interval delay in ms.
+
+export const promiseInterval = (promiseCall, interval) => {
+  let stopped = false
+  let timeout = null
+
+  const func = () => {
+    const promise = promiseCall()
+    // something unexpected happened and promiseCall did not
+    // return a promise, abort the loop.
+    if (!(promise && promise.finally)) {
+      console.warn('promiseInterval: promise call did not return a promise, stopping interval.')
+      return
+    }
+    promise.finally(() => {
+      if (stopped) return
+      timeout = window.setTimeout(func, interval)
+    })
+  }
+
+  const stopFetcher = () => {
+    stopped = true
+    window.clearTimeout(timeout)
+  }
+
+  timeout = window.setTimeout(func, interval)
+
+  return { stop: stopFetcher }
+}