代码：
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) > {
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")
}
输出：
panic: packageName: call foo
packageName: call bar
packageName: call baz
packageName: baz goroutine [running]:
panic(0x491000, 0xc420016300)
/opt/golang/go/src/runtime/panic.go: +0x1a1
main.ce(0x4f9140, 0xc4200162d0, 0x4a741f, 0x8, 0x0, 0x0, 0x0)
/opt/golang/workspace/src/github.com/junneyang/letsgo/error_test/error_common.go: +0x97
main.main()
/opt/golang/workspace/src/github.com/junneyang/letsgo/error_test/error_common.go: +0x69
Error: process exited with code .
参考资料：
http://reusee.github.io/post/error-handling/
https://github.com/reusee/codes/blob/master/err/err.go
https://github.com/golang/go/blob/master/src/encoding/gob/error.go