From de77cd381bc74a53ee0f90ed9675ba1b0b200e68 Mon Sep 17 00:00:00 2001
From: joe fleming <joe.fleming@gmail.com>
Date: Tue, 19 Feb 2019 16:37:38 -0700
Subject: [PATCH] feat: add 'exec and check' helper

useful for re-executing some function if the expected result isn't found
---
 src/lib/exec_and_check.mjs | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 src/lib/exec_and_check.mjs

diff --git a/src/lib/exec_and_check.mjs b/src/lib/exec_and_check.mjs
new file mode 100644
index 0000000..b89f140
--- /dev/null
+++ b/src/lib/exec_and_check.mjs
@@ -0,0 +1,21 @@
+export default async function execAndCheck(fn, test, onFailure = () => {}, opts = { tries: 3 }) {
+  let count = 0;
+
+  const tryExec = async () => {
+    // exec function
+    await fn();
+
+    // check test function result (pass/fail)
+    const res = await test();
+    if (res) return;
+
+    // if retry limit is hit, call failure function
+    count += 1;
+    if (count >= opts.tries) return onFailure(); // eslint-disable-line consistent-return
+
+    // retry the function and retest the results
+    return tryExec(); // eslint-disable-line consistent-return
+  };
+
+  return tryExec();
+}