singleflight

Documentation

Overview

Package singleflight provides a duplicate function call suppression mechanism. Borrowed from golang.org/x/sync/singleflight with fix that if first request gets cancelled/timedout the other requests non-cancelled requests get the value instead of cancellation signal.

Index

• type Group
  • func (g *Group[K, V]) Do(ctx context.Context, key K, fn func(context.Context) (V, error)) (V, error)

Types

type Group

type Group[K comparable, V any] struct {
	// contains filtered or unexported fields
}

Group represents a class of work and forms a namespace in which units of work can be executed with duplicate suppression.

func (*Group[K, V]) Do

func (g *Group[K, V]) Do(ctx context.Context, key K, fn func(context.Context) (V, error)) (V, error)

Do executes and returns the results of the given function, making sure that only one execution is in-flight for a given key at a time. If a duplicate comes in, the duplicate caller waits for the original to complete and receives the same results.