pkg/errors 调用栈重复问题

[yahuian]

pkg/errors#242

package main

import (
	"fmt"

	"github.com/pkg/errors"
)

func main() {
	err := one()
	fmt.Printf("%+v\n", err)
}

func one() error {
	return errors.Wrap(two(), "call two error")
}

func two() error {
	return errors.Wrap(three(), "call three error")
}

func three() error {
	return errors.New("something error")
}

可以看到每个 error 都带了调用栈，冗余信息比较多

something error
main.three
        /home/anyh/Documents/golang/demo/errors_demo/main.go:23
main.two
        /home/anyh/Documents/golang/demo/errors_demo/main.go:19
main.one
        /home/anyh/Documents/golang/demo/errors_demo/main.go:15
main.main
        /home/anyh/Documents/golang/demo/errors_demo/main.go:10
runtime.main
        /usr/local/go/src/runtime/proc.go:250
runtime.goexit
        /usr/local/go/src/runtime/asm_amd64.s:1598
call three error
main.two
        /home/anyh/Documents/golang/demo/errors_demo/main.go:19
main.one
        /home/anyh/Documents/golang/demo/errors_demo/main.go:15
main.main
        /home/anyh/Documents/golang/demo/errors_demo/main.go:10
runtime.main
        /usr/local/go/src/runtime/proc.go:250
runtime.goexit
        /usr/local/go/src/runtime/asm_amd64.s:1598
call two error
main.one
        /home/anyh/Documents/golang/demo/errors_demo/main.go:15
main.main
        /home/anyh/Documents/golang/demo/errors_demo/main.go:10
runtime.main
        /usr/local/go/src/runtime/proc.go:250
runtime.goexit
        /usr/local/go/src/runtime/asm_amd64.s:1598

当然你可以仅在最底层的 error 包含 stack，中间函数调用直接 return，这样最顶层就没有冗余信息了

package main

import (
	"fmt"

	"github.com/pkg/errors"
)

func main() {
	err := one()
	fmt.Printf("%+v\n", err)
}

func one() error {
	return two()
}

func two() error {
	return three()
}

func three() error {
	return errors.New("something error")
}

something error
main.three
        /home/anyh/Documents/golang/demo/errors_demo/main.go:23
main.two
        /home/anyh/Documents/golang/demo/errors_demo/main.go:19
main.one
        /home/anyh/Documents/golang/demo/errors_demo/main.go:15
main.main
        /home/anyh/Documents/golang/demo/errors_demo/main.go:10
runtime.main
        /usr/local/go/src/runtime/proc.go:250
runtime.goexit
        /usr/local/go/src/runtime/asm_amd64.s:1598

但是如果项目比较复杂，调用层级比较深的时候，不好保证