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retry.go
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retry.go
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package client
import (
"net/http"
"strings"
"time"
"github.com/cenkalti/backoff/v4"
)
// RetriesCount - default retries count.
const RetriesCount = 5
// RequestTimeout - default request timeout.
const RequestTimeout = 30 * time.Second
// RetryWaitTimeStart - default retry interval.
const RetryWaitTimeStart = 100 * time.Millisecond
// RetryWaitTimeMax - default maximum retry interval.
const RetryWaitTimeMax = 3 * time.Second
// RetryConfig configures Client retries.
type RetryConfig struct {
Condition RetryCondition
Count int
TotalRequestTimeout time.Duration
WaitTimeStart time.Duration
WaitTimeMax time.Duration
}
// RetryCondition defines which responses should retry.
type RetryCondition func(*http.Response, error) bool
// TestingRetry - fast retry for use in tests.
func TestingRetry() RetryConfig {
v := DefaultRetry()
v.WaitTimeStart = 1 * time.Millisecond
v.WaitTimeMax = 1 * time.Millisecond
return v
}
// DefaultRetry returns a default RetryConfig.
func DefaultRetry() RetryConfig {
return RetryConfig{
TotalRequestTimeout: RequestTimeout,
Count: RetriesCount,
WaitTimeStart: RetryWaitTimeStart,
WaitTimeMax: RetryWaitTimeMax,
Condition: DefaultRetryCondition(),
}
}
// DefaultRetryCondition retries on common network and HTTP errors.
func DefaultRetryCondition() RetryCondition {
return func(response *http.Response, err error) bool {
// On network errors - except hostname not found
if response == nil || response.StatusCode == 0 {
switch {
case strings.Contains(err.Error(), "No address associated with hostname"):
return false
case strings.Contains(err.Error(), "no such host"):
return false
default:
return true
}
}
// On HTTP status codes
switch response.StatusCode {
case
http.StatusRequestTimeout,
http.StatusConflict,
http.StatusLocked,
http.StatusTooManyRequests,
http.StatusInternalServerError,
http.StatusBadGateway,
http.StatusServiceUnavailable,
http.StatusGatewayTimeout:
return true
default:
return false
}
}
}
// NewBackoff returns an exponential backoff for HTTP retries.
func (c RetryConfig) NewBackoff() backoff.BackOff {
b := backoff.NewExponentialBackOff()
b.InitialInterval = c.WaitTimeStart
b.MaxInterval = c.WaitTimeMax
b.MaxElapsedTime = c.TotalRequestTimeout
b.Multiplier = 2
b.RandomizationFactor = 0
b.Reset()
return b
}