resilient-client

A resilience HTTP client. Fail and recover fast. resilient-client is a JavaScript HTTP client that executes requests and monitors their execution status. When request start failing, resilient-client plays dead and fails fast. You can provide function to manage failures. It uses Opossum, a Circuit Breaker and Axios underneath. For more about the Circuit Breaker pattern, there are lots of resources on the web.

Installing

npm i resilient-client

Usage

Let's say you've to call an API endpoint. HTTP requests might fail. All requests from resilient-client are perfomed on circuits. Resilient-client can throws HTTP error or Circuit Breaker error. A Circuit Breaker error can open the circuit. When the circuit is open subsequent requests are blocked untils the circuit close again.

const ResilientClient = require("resilient-client");
// import ResilientClient from "resilient-client"; // For ESM modules

const client = new ResilientClient(
    {
        timeout: 10000, // Set Opossum timeout option. If our request takes longer than 3 seconds, trigger a failure
        errorThresholdPercentage: 50, // Set Opossum errorThresholdPercentage option. If 50% of requests fail, open the circuit.
        resetTimeout: 30000, // Set Opossum resetTimeout option. After 30 seconds, try again.
    },
    {
        baseURL: "http://localhost:8000", // The API URL
    }
);

// Performs a GET request at http://localhost:8000/users
client
    .request({ url: "users", method: "get" })
    .then((result) => console.log(result))
    .catch((error) =>
        ResilientClient.isBreakerError(error)
            ? console.error("Circuit breaker error occured: " + error) // The request takes longer than 30 seconds
            : // or 50% of requests fail
              console.error("Http error occured: " + error)
    );

Examples

See examples/ folder for more uses cases.

Documentation

Check out the full documentation here.

Contribution

Contributions are welcome. See CONTRIBUTING.md.