// Copyright (c) Facebook, Inc. and its affiliates.

//

// This source code is licensed under the MIT license found in the

// LICENSE file in the root directory of this source tree.

package api

import (

"time"

)

// Option is an additional argument to method New to change the behavior

// of API processing.

type Option interface {

Apply(*Config)

}

// Config is a set of knobs to change the behavior of API processing.

// In other words, Config aggregates all the Option-s into one structure.

type Config struct {

// EventTimeout defines time duration for API request to be processed.

// If a request is not processed in time, then an error is returned to the

// client.

EventTimeout time.Duration

// ServerIDFunc defines a custom server ID in API responses.

ServerIDFunc ServerIDFunc

}

// OptionEventTimeout defines time duration for API request to be processed.

// If a request is not processed in time, then an error is returned to the

// client.

type OptionEventTimeout time.Duration

// Apply implements Option.

func (opt OptionEventTimeout) Apply(config *Config) {

config.EventTimeout = (time.Duration)(opt)

}

// OptionServerID defines a custom server ID in API responses.

type OptionServerID string

// Apply implements Option.

func (opt OptionServerID) Apply(config *Config) {

config.ServerIDFunc = func() string {

return string(opt)

}

}

// getConfig converts a set of Option-s into one structure "Config".

func getConfig(opts ...Option) Config {

result := Config{

EventTimeout: DefaultEventTimeout,

}

for _, opt := range opts {

opt.Apply(&result)

}

return result

}