序
本文主要研究一下dubbo-go-proxy的recoveryFilter
recoveryFilter
dubbo-go-proxy/pkg/filter/recovery/recovery.go
func Init() {
extension.SetFilterFunc(constant.RecoveryFilter, recoveryFilterFunc())
}
func recoveryFilterFunc() context.FilterFunc {
return New().Do()
}
// recoveryFilter is a filter for recover.
type recoveryFilter struct {
}
// New create timeout filter.
func New() filter.Filter {
return &recoveryFilter{}
}
recoveryFilter往extension注册名为
dgp.filters.recovery的recoveryFilterFunc；该func执行的是recoveryFilter的Do方法
Do
dubbo-go-proxy/pkg/filter/recovery/recovery.go
// Recovery execute recoveryFilter filter logic, if recover happen, print log or do other things.
func (f recoveryFilter) Do() context.FilterFunc {
return func(c context.Context) {
defer func() {
if err := recover(); err != nil {
logger.Warnf("[dubboproxy go] error:%+v", err)
c.WriteErr(err)
}
}()
c.Next()
}
}
Do方法先注册一个defer func进行recover，然后再执行c.Next()
小结
dubbo-go-proxy的recoveryFilter注册一个defer func进行recover，然后再执行c.Next()。
