【GoLang】GoLang 错误处理 -- 异常处理思路示例

package main

import (
"fmt"
//    "testing"
)

var Pkg = "packageName"

type Err struct {
Pkg  string
Info string
Prev error
}

func (e *Err) Error() string {
if e.Prev == nil {
return fmt.Sprintf("%s: %s", e.Pkg, e.Info)
}
return fmt.Sprintf("%s: %s\n%v", e.Pkg, e.Info, e.Prev)
}

func me(err error, format string, args ...interface{}) *Err {
if len(args) > 0 {
return &Err{
Pkg:  Pkg,
Info: fmt.Sprintf(format, args...),
Prev: err,
}
}
return &Err{
Pkg:  Pkg,
Info: format,
Prev: err,
}
}

func ce(err error, format string, args ...interface{}) {
if err != nil {
panic(me(err, format, args...))
}
}

func ct(err *error) {
if p := recover(); p != nil {
if e, ok := p.(error); ok {
*err = e
} else {
panic(p)
}
}
}

func oe(e error) error {
var ret error = e
for err, ok := ret.(*Err); ok && err.Prev != nil; err, ok = ret.(*Err) {
ret = err.Prev
}
return ret
}

func foo() (err error) {
defer ct(&err)
ce(bar(), "call bar")
return
}

func bar() (err error) {
defer ct(&err)
ce(baz(), "call baz")
return
}

func baz() (err error) {
return me(nil, "baz")
}

func main() {
ce(foo(), "call foo")
}

panic: packageName: call foo
packageName: call bar
packageName: call baz
packageName: baz

goroutine 1 [running]:
panic(0x491000, 0xc420016300)
/opt/golang/go/src/runtime/panic.go:500 +0x1a1
main.ce(0x4f9140, 0xc4200162d0, 0x4a741f, 0x8, 0x0, 0x0, 0x0)
/opt/golang/workspace/src/github.com/junneyang/letsgo/error_test/error_common.go:40 +0x97
main.main()
/opt/golang/workspace/src/github.com/junneyang/letsgo/error_test/error_common.go:79 +0x69
Error: process exited with code 2.