backoff/backoff.go

/*
 *
 * Copyright 2019 gRPC authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

// Package backoff provides configuration options for backoff.
//
// More details can be found at:
// https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md.
//
// All APIs in this package are experimental.
package backoff

import "time"

// Config defines the configuration options for backoff.
type Config struct {
	// BaseDelay is the amount of time to backoff after the first failure.
	BaseDelay time.Duration
	// Multiplier is the factor with which to multiply backoffs after a
	// failed retry. Should ideally be greater than 1.
	Multiplier float64
	// Jitter is the factor with which backoffs are randomized.
	Jitter float64
	// MaxDelay is the upper bound of backoff delay.
	MaxDelay time.Duration
}

// DefaultConfig is a backoff configuration with the default values specfied
// at https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md.
//
// This should be useful for callers who want to configure backoff with
// non-default values only for a subset of the options.
var DefaultConfig = Config{
	BaseDelay:  1.0 * time.Second,
	Multiplier: 1.6,
	Jitter:     0.2,
	MaxDelay:   120 * time.Second,
}