社区不少人在谈论 golang 为毛不用trycatch模式，而采用苛刻的recovery、panic、defer组合…. 从老外那整了一个trycatch包，感觉不错，拿出来分享下…
package main
import (
"reflect"
)
type TryCatch struct {
errChan chan interface{}
catches map[reflect.Type]func(err error)
defaultCatch func(err error)
}
func (t TryCatch) Try(block func()) TryCatch {
t.errChan = make(chan interface{})
t.catches = map[reflect.Type]func(err error){}
t.defaultCatch = func(err error) {}
go func() {
defer func() {
t.errChan <- recover()
}()
block()
}()
return t
}
func (t TryCatch) CatchAll(block func(err error)) TryCatch {
t.defaultCatch = block
return t
}
func (t TryCatch) Catch(e error, block func(err error)) TryCatch {
errorType := reflect.TypeOf(e)
t.catches[errorType] = block
return t
}
func (t TryCatch) Finally(block func()) TryCatch {
err := <-t.errChan
if err != nil {
catch := t.catches[reflect.TypeOf(err)]
if catch != nil {
catch(err.(error))
} else {
t.defaultCatch(err.(error))
}
}
block()
return t
}
type MyError struct {
error
}
func main() {
TryCatch{}.Try(func() {
println("do something buggy")
panic(MyError{})
}).Catch(MyError{}, func(err error) {
println("catch MyError")
}).CatchAll(func(err error) {
println("catch error")
}).Finally(func() {
println("finally do something")
})
println("done")
}
