/
analyze.go
65 lines (60 loc) · 1.46 KB
/
analyze.go
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package errors
import (
"bytes"
)
// Tail of the error chain: at the end
func Tail(err error) error {
if tail, ok := err.(errLinkedList); ok {
return tail.Tail()
}
if causable, ok := err.(causableError); ok {
return causable.Cause()
}
if hasTail, ok := err.(hasInner); ok {
i := hasTail.GetInner()
if i == err || i == nil {
return err
}
return Tail(i)
}
return err
}
// Next error just below this one, or nil if there is no next error. Note this may be an error created
// for you if you used annotations. As a user, you probably don't want to use this.
func Next(err error) error {
if tail, ok := err.(errLinkedList); ok {
return tail.Next()
}
if u, ok := err.(hasUnderline); ok {
return u.Underlying()
}
if i, ok := err.(hasInner); ok {
return i.GetInner()
}
return nil
}
// Message is the error string at the Head of the linked list
func Message(err error) string {
if tail, ok := err.(errLinkedList); ok {
return tail.Head().Error()
}
if hasMsg, ok := err.(hasMessage); ok {
return hasMsg.Message()
}
return err.Error()
}
// Details are an easy to read concat of all the error strings in a chain
func Details(err error) string {
b := bytes.Buffer{}
PanicIfErr(b.WriteByte('['), "unexpected")
first := true
for ; err != nil; err = Next(err) {
if !first {
PanicIfErrWrite(b.WriteString(" | "))
}
PanicIfErrWrite(b.WriteString(Message(err)))
first = false
}
PanicIfErr(b.WriteByte(']'), "unexpected")
return b.String()
}