milvus/internal/util/retry/retry.go

72 lines
1.6 KiB
Go

// Copyright (C) 2019-2020 Zilliz. All rights reserved.
//
// 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 retry
import (
"context"
"fmt"
"strings"
"time"
)
func Do(ctx context.Context, fn func() error, opts ...Option) error {
c := NewDefaultConfig()
for _, opt := range opts {
opt(c)
}
el := make(ErrorList, c.attempts)
for i := uint(0); i < c.attempts; i++ {
if err := fn(); err != nil {
if s, ok := err.(InterruptError); ok {
return s.error
}
el[i] = err
select {
case <-time.After(c.sleep):
case <-ctx.Done():
return ctx.Err()
}
c.sleep *= 2
if c.sleep > c.maxSleepTime {
c.sleep = c.maxSleepTime
}
} else {
return nil
}
}
return el
}
type ErrorList []error
func (el ErrorList) Error() string {
var builder strings.Builder
builder.WriteString("All attempts results:\n")
for index, err := range el {
builder.WriteString(fmt.Sprintf("attempt #%d:%s\n", index+1, err.Error()))
}
return builder.String()
}
type InterruptError struct {
error
}
func NoRetryError(err error) InterruptError {
return InterruptError{err}
}