From 8a4cf9d3d88090397bde419d7f6894ead7d5b7c6 Mon Sep 17 00:00:00 2001
From: svmlitimur <svmlitimur@gmail.com>
Date: Thu, 30 May 2024 02:22:05 +0300
Subject: [PATCH] Add retry wrapper example

---
 JavaScript/a-retry-wrapper.js | 69 +++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 JavaScript/a-retry-wrapper.js

diff --git a/JavaScript/a-retry-wrapper.js b/JavaScript/a-retry-wrapper.js
new file mode 100644
index 0000000..d342df4
--- /dev/null
+++ b/JavaScript/a-retry-wrapper.js
@@ -0,0 +1,69 @@
+'use strict';
+
+const retry = (options = {}) => {
+  const {
+    task = null,
+    recovery = null,
+    handleRecovery = false,
+    tryCount = 3,
+  } = options;
+
+  const errors = [];
+  let count = 0;
+
+  return async (...args) => {
+    while (count++ < tryCount) {
+      try {
+        const res = await task(...args);
+        return res;
+      } catch (err) {
+        errors.push(err);
+        if (recovery) {
+          await recovery(...args).catch((err) => {
+            if (!handleRecovery) throw err;
+            errors.push(err);
+          });
+        }
+      }
+    }
+    const finallyError = new Error('To many tries');
+    throw new AggregateError([...errors, finallyError]);
+  };
+};
+
+// Usage
+let targetUrl = 'wrong-url';
+
+const sendRequest = () =>
+  new Promise((resolve, reject) => {
+    fetch(targetUrl).then(
+      (res) => {
+        console.log('Got response');
+        resolve(res);
+      },
+      (err) => {
+        console.error('Got error');
+        reject(err);
+      },
+    );
+  });
+
+const updateUrl = (url) =>
+  new Promise((resolve, reject) => {
+    setTimeout(() => {
+      targetUrl = url;
+      // reject(new Error('Can not update url'));
+      console.log('Updated url');
+      resolve();
+    }, 1_000);
+  });
+
+const trySendRequest = retry({
+  task: sendRequest,
+  recovery: updateUrl,
+  handleRecovery: true,
+  tryCount: 3,
+  // tryCount: 1,
+});
+
+trySendRequest('https://google.com').then(console.log);
\ No newline at end of file