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retry.go
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/
retry.go
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package retry
import (
"fmt"
"time"
)
// Try 尝试重试函数,如果函数执行失败,则延长时间重试
// name: 重试任务名称, F: 需要重试的函数, Duration 默认延迟重试时间, MaxTimes 最大重试次数
type Try struct {
Name string
F func() error
Duration time.Duration
MaxTimes int
}
func NewTry(name string, f func() error, d time.Duration, maxTimes int) *Try {
return &Try{
Name: name,
F: f,
Duration: d,
MaxTimes: maxTimes,
}
}
// Report 尝试重试的报告
// Result为函数执行结果,Times为尝试次数, Duration为函数执行时间,SumDuration为总执行时间, Errs为函数执行错误记录
type Report struct {
Name string
Result bool
Times int
SumDuration time.Duration
Errs []error
}
func (report *Report) Error() string {
return fmt.Sprintf("[retry]名称:%s,结果:%v,尝试次数:%v,总时间:%v,错误:%v", report.Name, report.Result, report.Times, report.SumDuration, report.Errs)
}
// Run 开始尝试重试,返回chan可以用于接收尝试报告
func (try Try) Run() <-chan Report {
result := make(chan Report, 1)
go func() {
defer close(result)
start := time.Now()
var errs []error
for i := 0; i < try.MaxTimes; i++ {
time.Sleep(try.Duration)
err := try.F()
if err == nil {
result <- Report{
Name: try.Name,
Result: true,
Times: i + 1,
SumDuration: time.Since(start),
Errs: errs,
}
return
}
errs = append(errs, err)
}
result <- Report{
Name: try.Name,
Result: false,
Times: try.MaxTimes,
SumDuration: time.Since(start),
Errs: errs,
}
}()
return result
}