Package list golang-github-go-kit-kit / 756104ab-e3ba-487b-8d5b-cc84465cfc29/main endpoint / endpoint.go

Tree @756104ab-e3ba-487b-8d5b-cc84465cfc29/main (Download .tar.gz)

endpoint.go @756104ab-e3ba-487b-8d5b-cc84465cfc29/mainraw · history · blame

package endpoint

import (

// Endpoint is the fundamental building block of servers and clients.
// It represents a single RPC method.
type Endpoint func(ctx context.Context, request interface{}) (response interface{}, err error)

// Nop is an endpoint that does nothing and returns a nil error.
// Useful for tests.
func Nop(context.Context, interface{}) (interface{}, error) { return struct{}{}, nil }

// Middleware is a chainable behavior modifier for endpoints.
type Middleware func(Endpoint) Endpoint

// Chain is a helper function for composing middlewares. Requests will
// traverse them in the order they're declared. That is, the first middleware
// is treated as the outermost middleware.
func Chain(outer Middleware, others ...Middleware) Middleware {
	return func(next Endpoint) Endpoint {
		for i := len(others) - 1; i >= 0; i-- { // reverse
			next = others[i](next)
		return outer(next)