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retry.go
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retry.go
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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"
"sync"
"time"
"github.com/pkg/errors"
)
const (
DefaultRetryCount = 3 // 默认的超时重试次数
DefaultGapTime = 3 * time.Second // 默认的超时时间间隔
)
var instance *RetryOption
var once sync.Once
type DelayRetryFunc func(context.Context, interface{}) (interface{}, bool, error)
type RetryOption struct {
GapTime time.Duration // 重试间隔时间
RetryCount int // 重试次数
RetryFunc DelayRetryFunc // 重试函数
ctx context.Context
}
func NewRetryOption(ctx context.Context, gapTime time.Duration, retryCount int, func_ DelayRetryFunc) *RetryOption {
once.Do(func() {
instance = &RetryOption{
GapTime: gapTime,
RetryCount: retryCount,
RetryFunc: func_,
ctx: ctx,
}
})
return instance
}
func (r *RetryOption) Retry(ctx context.Context, req interface{}) (resp interface{}, err error) {
if r.RetryFunc == nil {
return resp, errors.Wrap(errors.New("RetryFunc is nil"), "failed to retry")
}
for i := 0; i < r.RetryCount; i++ {
res, needRetry, errx := r.RetryFunc(ctx, req)
if needRetry || errx != nil {
err = errx
fmt.Printf("retry count %d ", i+1)
time.Sleep(r.GapTime)
continue
}
resp = res
break
}
return resp, errors.Wrap(err, "needRetry or errx is not nil")
}