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+---
+templateKey: blog-post
+title: >-
+  Fetch Retries in Javascript with Structured Concurrency using Effection
+date: 2023-02-19T20:00:00.959Z
+author: Taras Mankovski, Min Kim
+description: >-
+  WIP
+tags: [ "javascript", "structured concurrency"]
+img: /img/2023-12-18-announcing-effection-v3.png
+---
+
+Intro - "you're a developer..."
+
+## Simple Fetch
+
+Writing a simple fetch call using effection
+
+```js
+import { main, useAbortSignal, call } from 'effection';
+
+function* fetchURL() {
+  const signal = yield* useAbortSignal();
+  const response = yield* call(fetch("https://foo.bar"), { signal });
+
+  if (response.ok) {
+    return yield* call(response.json());
+  }
+}
+
+main(function* () {
+  const result = yield* fetchURL();
+  console.log(result);
+});
+```
+
+explain main, call, useAbortSignal, yield*
+
+## Exponential Backoff
+
+Let's add retry logic with exponential backoff
+
+```js
+import { main, useAbortSignal, call, sleep } from 'effection';
+
+function* fetchWithBackoff() {
+  let attempt = -1;
+  while (true) {
+    const signal = yield* useAbortSignal();
+    const response = yield* call(fetch("https://foo.bar"), { signal });
+
+    if (response.ok) {
+      return yield* call(response.json());
+    }
+    let delayMs: number;
+
+    // https://aws.amazon.com/ru/blogs/architecture/exponential-backoff-and-jitter/
+    const backoff = Math.pow(2, attempt) * 1000;
+    delayMs = Math.round((backoff * (1 + Math.random())) / 2);
+
+    if (delayMs > 4000) {
+      return new Error("reached timeout");
+    }
+
+    yield* sleep(delayMs);
+    attempt++;
+  }
+}
+
+main(function* () {
+  const result = yield* fetchWithBackoff();
+  console.log(result);
+});
+```
+
+explain sleep
+
+## Structured Concurrency
+
+Now let's add a timeout using race
+
+```js
+import { main, useAbortSignal, call, sleep, race } from 'effection';
+
+function* fetchWithBackoff() {
+  let attempt = -1;
+  while (true) {
+    const signal = yield* useAbortSignal();
+    const response = yield* call(fetch("https://foo.bar"), { signal });
+
+    if (response.ok) {
+      return yield* call(response.json());
+    }
+    let delayMs: number;
+
+    // https://aws.amazon.com/ru/blogs/architecture/exponential-backoff-and-jitter/
+    const backoff = Math.pow(2, attempt) * 1000;
+    delayMs = Math.round((backoff * (1 + Math.random())) / 2);
+
+    yield* sleep(delayMs);
+    attempt++;
+  }  
+}
+
+main(function* () {
+  const result = yield* race([
+    fetchWithBackoff(),
+    sleep(60_000),
+  ]);
+  console.log(result);
+});
+```
+
+explain race - abort signal does not need to be threaded through nor do we need to clear timeout, if timeout wins the race, the fetch will be aborted automatically and vice versa
+
+composable
+
+## Reusable
+
+we can go even further and make the retry function reusable
+
+```js
+function* retryWithBackoff<T>(fn: () => Operation<T>, options: { timeout: number }) {
+  function* body() {
+    let attempt = -1;
+
+    while (true) {
+      try {
+        return yield* fn();
+      } catch {
+        let delayMs: number;
+
+        // https://aws.amazon.com/ru/blogs/architecture/exponential-backoff-and-jitter/
+        const backoff = Math.pow(2, attempt) * 1000;
+        delayMs = Math.round((backoff * (1 + Math.random())) / 2);
+    
+        yield* sleep(delayMs);
+        attempt++;
+      }
+    }
+  }
+
+  return race([
+    body(),
+    sleep(options.timeout)
+  ]);
+}
+```
+
+then our main function can be:
+
+```js
+main (function* () {
+  const result = yield* retryWithBackoff(function* () {
+    const signal = yield* useAbortSignal();
+    const response = yield* call(fetch("https://foo.bar", { signal }));
+
+    if (response.ok) {
+      return yield* call(response.json);
+    } else {
+      throw new Error(response.statusText);
+    }
+  }, {
+    timeout: 60_000,
+  });
+  console.log(result);
+});
+```