vesper

vesper is an idiomatic approach to building resilient http clients in go.

Usage

package main

import (
 	"github.com/kidtronnix/go-resiliency/breaker"
 	"github.com/kidtronnix/go-resiliency/limiter"
	"github.com/kidtronnix/go-resiliency/retrier"
)


func main() {
 	// make rate limiter
	l := limiter.New(0, 5.0)
	defer l.Close()

	// make a resiliient http client
	client = vesper.Decorate(
		&http.Client{Timeout: time.Second}, // your http client
		vesper.Logger(log.New(os.Stdout, "[vesper]", 0)),
		vesper.Retry(retrier.New(retrier.ConstantBackoff(*retries, *backoff), nil)),
		vesper.Breaker(breaker.New(10, 1, 5*time.Second)),
		vesper.RateLimit(l.Limiter()),
	)

  	// use client just like normal.
	req, _ := http.NewRequest("GET", "http://example.com", nil)
	resp, err := client.Do(req)
  	// ...
}

Decorators

Vesper provides a set of decorators for http clients, and framework for adding your own. It only decorates the Do method on a provided http client.

The following is the out the box decorators...

• Breaker - will error early without making http requests when an error threshold is met.
• Logger - will print useful messages on each request.
• RateLimit - will limit rate of making http reques.
• Retry - will retry failed http requests.