mirror of
https://gitee.com/milvus-io/milvus.git
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93 lines
2.2 KiB
Go
93 lines
2.2 KiB
Go
// Copyright (C) 2019-2020 Zilliz. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
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// with the License. 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 distributed under the License
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// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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// or implied. See the License for the specific language governing permissions and limitations under the License.
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package retry
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import (
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"context"
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"fmt"
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"strings"
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"time"
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)
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// Do will run function with retry mechanism.
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// fn is the func to run.
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// Option can control the retry times and timeout.
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func Do(ctx context.Context, fn func() error, opts ...Option) error {
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c := newDefaultConfig()
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for _, opt := range opts {
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opt(c)
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}
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var el ErrorList
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for i := uint(0); i < c.attempts; i++ {
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if err := fn(); err != nil {
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el = append(el, err)
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if ok := IsUncoverable(err); ok {
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return el
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}
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select {
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case <-time.After(c.sleep):
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case <-ctx.Done():
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el = append(el, ctx.Err())
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return el
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}
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c.sleep *= 2
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if c.sleep > c.maxSleepTime {
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c.sleep = c.maxSleepTime
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}
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} else {
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return nil
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}
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}
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return el
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}
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// ErrorList for print error log
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type ErrorList []error
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// TODO shouldn't print all retries, might be too much
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// Error method return an string representation of retry error list.
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func (el ErrorList) Error() string {
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var builder strings.Builder
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builder.WriteString("All attempts results:\n")
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for index, err := range el {
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// if early termination happens
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if err == nil {
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break
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}
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builder.WriteString(fmt.Sprintf("attempt #%d:%s\n", index+1, err.Error()))
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}
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return builder.String()
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}
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type unrecoverableError struct {
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error
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}
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// Unrecoverable method wrap an error to unrecoverableError. This will make retry
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// quick return.
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func Unrecoverable(err error) error {
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return unrecoverableError{err}
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}
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// IsUncoverable is used to judge whether the error is wrapped by unrecoverableError.
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func IsUncoverable(err error) bool {
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_, isUnrecoverable := err.(unrecoverableError)
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return isUnrecoverable
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}
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