cloudflared-mirror/vendor/google.golang.org/grpc/internal/backoff/backoff.go

110 lines
3.3 KiB
Go

/*
*
* Copyright 2017 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 implement the backoff strategy for gRPC.
//
// This is kept in internal until the gRPC project decides whether or not to
// allow alternative backoff strategies.
package backoff
import (
"context"
"errors"
"time"
grpcbackoff "google.golang.org/grpc/backoff"
"google.golang.org/grpc/internal/grpcrand"
)
// Strategy defines the methodology for backing off after a grpc connection
// failure.
type Strategy interface {
// Backoff returns the amount of time to wait before the next retry given
// the number of consecutive failures.
Backoff(retries int) time.Duration
}
// DefaultExponential is an exponential backoff implementation using the
// default values for all the configurable knobs defined in
// https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md.
var DefaultExponential = Exponential{Config: grpcbackoff.DefaultConfig}
// Exponential implements exponential backoff algorithm as defined in
// https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md.
type Exponential struct {
// Config contains all options to configure the backoff algorithm.
Config grpcbackoff.Config
}
// Backoff returns the amount of time to wait before the next retry given the
// number of retries.
func (bc Exponential) Backoff(retries int) time.Duration {
if retries == 0 {
return bc.Config.BaseDelay
}
backoff, max := float64(bc.Config.BaseDelay), float64(bc.Config.MaxDelay)
for backoff < max && retries > 0 {
backoff *= bc.Config.Multiplier
retries--
}
if backoff > max {
backoff = max
}
// Randomize backoff delays so that if a cluster of requests start at
// the same time, they won't operate in lockstep.
backoff *= 1 + bc.Config.Jitter*(grpcrand.Float64()*2-1)
if backoff < 0 {
return 0
}
return time.Duration(backoff)
}
// ErrResetBackoff is the error to be returned by the function executed by RunF,
// to instruct the latter to reset its backoff state.
var ErrResetBackoff = errors.New("reset backoff state")
// RunF provides a convenient way to run a function f repeatedly until the
// context expires or f returns a non-nil error that is not ErrResetBackoff.
// When f returns ErrResetBackoff, RunF continues to run f, but resets its
// backoff state before doing so. backoff accepts an integer representing the
// number of retries, and returns the amount of time to backoff.
func RunF(ctx context.Context, f func() error, backoff func(int) time.Duration) {
attempt := 0
timer := time.NewTimer(0)
for ctx.Err() == nil {
select {
case <-timer.C:
case <-ctx.Done():
timer.Stop()
return
}
err := f()
if errors.Is(err, ErrResetBackoff) {
timer.Reset(0)
attempt = 0
continue
}
if err != nil {
return
}
timer.Reset(backoff(attempt))
attempt++
}
}