JavaScriptCodeSnippets/CircuitBreaker.js at master · rnagasudhakar/JavaScriptCodeSnippets · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
const testFunction = () => {
  let count = 0;

  return function () {
    count++;
    if (count < 4) {
      throw "failed";
    } else {
      return "hello";
    }
  };
};

function circuitBreaker(callBack, retrires, timeLimit) {
  let retryCount = 0;
  let startingHaltedTime = null;
  let isHalted = false;
  return function () {
    if (retryCount === retrires) {
      if (!startingHaltedTime) {
        startingHaltedTime = Date.now();
      }
      isHalted = true;
    }
    if (isHalted && Date.now() - startingHaltedTime <= timeLimit) {
      console.error("Service unavailable");
      return;
    }

    if (isHalted) {
      isHalted = false;
      retryCount = 0;
      startingHaltedTime = null;
    }

    try {
      const result = callBack();
      retryCount = 0;
      return result;
    } catch {
      console.error("error");
      retryCount++;
    }
  };
}

let t = testFunction();
let c = circuitBreaker(t, 3, 200);

c();
c();
c();

c();
c();
c();
c();
c();

setTimeout(() => {
  console.log(c());
}, 300); // "hello";