mirror of https://github.com/goharbor/harbor.git
167 lines
3.6 KiB
Go
167 lines
3.6 KiB
Go
// Copyright Project Harbor Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package retry
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import (
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"fmt"
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"math/rand"
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"time"
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"github.com/jpillora/backoff"
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"github.com/goharbor/harbor/src/lib/errors"
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)
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func init() {
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rand.NewSource(time.Now().UnixNano())
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}
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var (
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// ErrRetryTimeout timeout error for retrying
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ErrRetryTimeout = errors.New("retry timeout")
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)
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type abort struct {
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cause error
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}
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func (a *abort) Error() string {
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if a.cause != nil {
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return fmt.Sprintf("retry abort, error: %v", a.cause)
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}
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return "retry abort"
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}
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// Abort wrap err to stop the Retry function
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func Abort(err error) error {
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return &abort{cause: err}
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}
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// Options options for the retry functions
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type Options struct {
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InitialInterval time.Duration // the initial interval for retring after failure, default 100 milliseconds
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MaxInterval time.Duration // the max interval for retring after failure, default 1 second
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Timeout time.Duration // the total time before returning if something is wrong, default 1 minute
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Callback func(err error, sleep time.Duration) // the callback function for Retry when the f called failed
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Backoff bool
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}
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// Option ...
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type Option func(*Options)
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// InitialInterval set initial interval
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func InitialInterval(initial time.Duration) Option {
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return func(opts *Options) {
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opts.InitialInterval = initial
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}
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}
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// MaxInterval set max interval
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func MaxInterval(max time.Duration) Option {
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return func(opts *Options) {
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opts.MaxInterval = max
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}
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}
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// Timeout set timeout interval
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func Timeout(timeout time.Duration) Option {
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return func(opts *Options) {
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opts.Timeout = timeout
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}
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}
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// Callback set callback
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func Callback(callback func(err error, sleep time.Duration)) Option {
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return func(opts *Options) {
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opts.Callback = callback
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}
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}
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// Backoff set backoff
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func Backoff(backoff bool) Option {
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return func(opts *Options) {
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opts.Backoff = backoff
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}
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}
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// Retry retry until f run successfully or timeout
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//
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// NOTE: This function will use exponential backoff and jitter for retrying, see
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// https://aws.amazon.com/blogs/architecture/exponential-backoff-and-jitter/ for more information
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func Retry(f func() error, options ...Option) error {
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opts := &Options{
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Backoff: true,
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}
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for _, o := range options {
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o(opts)
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}
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if opts.InitialInterval <= 0 {
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opts.InitialInterval = time.Millisecond * 100
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}
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if opts.MaxInterval <= 0 {
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opts.MaxInterval = time.Second
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}
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if opts.Timeout <= 0 {
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opts.Timeout = time.Minute
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}
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var b *backoff.Backoff
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if opts.Backoff {
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b = &backoff.Backoff{
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Min: opts.InitialInterval,
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Max: opts.MaxInterval,
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Factor: 2,
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Jitter: true,
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}
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}
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var err error
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timeout := time.After(opts.Timeout)
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for {
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select {
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case <-timeout:
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return errors.New(ErrRetryTimeout).WithCause(err)
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default:
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err = f()
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if err == nil {
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return nil
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}
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var ab *abort
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if errors.As(err, &ab) {
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return ab.cause
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}
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var sleep time.Duration
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if opts.Backoff {
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sleep = b.Duration()
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}
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if opts.Callback != nil {
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opts.Callback(err, sleep)
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}
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time.Sleep(sleep)
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}
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}
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}
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