gollback

⚙️ gollback

gollback - Go asynchronous simple function utilities, for managing execution of closures and callbacks

📖 ABOUT

Contributors:

• Rafał Lorenz

Want to contribute ? Feel free to send pull requests!

Have problems, bugs, feature ideas? We are using the github issue tracker to manage them.

📚 Documentation

For examples visit godoc#pkg-examples

For GoDoc reference, visit pkg.go.dev

🚏 HOW TO USE

🚅 Benchmark

CPU: 3,3 GHz Intel Core i7

RAM: 16 GB 2133 MHz LPDDR3

➜  gollback git:(master) ✗ go test -bench=. -cpu=4 -benchmem
goos: darwin
goarch: amd64
pkg: github.com/vardius/gollback
BenchmarkRace-4    	  566022	      2608 ns/op	     663 B/op	       5 allocs/op
BenchmarkAll-4     	 5052489	       241 ns/op	      42 B/op	       1 allocs/op
BenchmarkRetry-4   	206430384	         5.93 ns/op	       0 B/op	       0 allocs/op
PASS
ok  	github.com/vardius/gollback	31.741s

Race

Race method returns a response as soon as one of the callbacks in an iterable resolves with the value that is not an error, otherwise last error is returne

package main

import (
	"context"
	"errors"
	"fmt"
	"time"

	"github.com/vardius/gollback"
)

func main() {
	r, err := gollback.Race(
		context.Background(),
		func(ctx context.Context) (interface{}, error) {
			time.Sleep(3 * time.Second)
			return 1, nil
		},
		func(ctx context.Context) (interface{}, error) {
			return nil, errors.New("failed")
		},
		func(ctx context.Context) (interface{}, error) {
			return 3, nil
		},
	)
}

All

All method returns when all of the callbacks passed as an iterable have finished, returned responses and errors are ordered according to callback order

package main

import (
	"context"
	"errors"
	"fmt"
	"time"

	"github.com/vardius/gollback"
)

func main() {
	rs, errs := gollback.All(
		context.Background(),
		func(ctx context.Context) (interface{}, error) {
			time.Sleep(3 * time.Second)
			return 1, nil
		},
		func(ctx context.Context) (interface{}, error) {
			return nil, errors.New("failed")
		},
		func(ctx context.Context) (interface{}, error) {
			return 3, nil
		},
	)
}

Retry

Retry method retries callback given amount of times until it executes without an error, when retries = 0 it will retry infinitely

package main

import (
	"context"
	"errors"
	"fmt"
	"time"

	"github.com/vardius/gollback"
)

func main() {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	// Will retry infinitely until timeouts by context (after 5 seconds)
	res, err := gollback.Retry(ctx, 0, func(ctx context.Context) (interface{}, error) {
		return nil, errors.New("failed")
	})

	// Will retry 5 times or will timeout by context (after 5 seconds)
	res, err := gollback.Retry(ctx, 5, func(ctx context.Context) (interface{}, error) {
		return nil, errors.New("failed")
	})
}

📜 License

This package is released under the MIT license. See the complete license in the package