func TestCallersMulti(t *testing.T) {
m := stack.CallersMulti(0)
const expected = "stack_test.go:35 TestCallersMulti"
first := m.Stacks()[0][0].String()
if !strings.HasSuffix(first, expected) {
t.Fatalf(`expected suffix "%s" got "%s"`, expected, first)
}
}
func stackFromErrValue(errValue interface{}) *stack.Multi {
if stackErr, ok := errValue.(stackErr); ok {
return stackErr.MultiStack()
} else {
// skip 2 stack frames such that top frame is the service handler
return stack.CallersMulti(2)
}
}
func TestCallersMulti(t *testing.T) {
m := stack.CallersMulti(0)
const expected = "github.com/facebookgo/stack/stack_test.go:35 TestCallersMulti"
first := m.Stacks()[0][0].String()
if first != expected {
t.Fatalf(`expected "%s" got "%s"`, expected, first)
}
}
func TestCallersMultiWithTwo(t *testing.T) {
m := stack.CallersMulti(0)
m.AddCallers(0)
matches := []string{
"stack_test.go:44 +TestCallersMultiWithTwo$",
"",
"",
`\(Stack 2\)$`,
"stack_test.go:46 +TestCallersMultiWithTwo$",
}
match(t, m.String(), matches)
}
func TestCallersMultiWithTwo(t *testing.T) {
m := stack.CallersMulti(0)
m.AddCallers(0)
matches := []string{
"^github.com/facebookgo/stack/stack_test.go:44 +TestCallersMultiWithTwo$",
"",
"",
`^\(Stack 2\)$`,
"^github.com/facebookgo/stack/stack_test.go:46 +TestCallersMultiWithTwo$",
}
match(t, m.String(), matches)
}
// WrapSkip the error and add the current Stack. The argument skip is the
// number of stack frames to ascend, with 0 identifying the caller of Wrap. If
// the error to be wrapped has a MultiStack, the current stack will be added to
// it. If the error to be wrapped is nil, a nil error is returned.
func WrapSkip(err error, skip int) error {
// nil errors are returned back as nil.
if err == nil {
return nil
}
// we're adding another Stack to an already wrapped error.
if se, ok := err.(hasMultiStack); ok {
se.MultiStack().AddCallers(skip + 1)
return err
}
// we're create a freshly wrapped error.
return &Error{
multiStack: stack.CallersMulti(skip + 1),
underlying: err,
}
}
// WrapSkip may wrap the error and return an augmented error depending on the
// configuration in the context. The defaults result in the error being
// returned as is. It also handles nils correctly, returning a nil in that
// case. If the given error is already wrapped, it returns it as-is.
func WrapSkip(ctx context.Context, err error, skip int) error {
switch err := err.(type) {
case nil:
return nil
case *singleFrameError:
return err
case *singleStackError:
return err
case *multiStackError:
err.multiStack.AddCallers(skip + 1)
return err
}
config := ContextConfig(ctx)
switch config.StackMode {
case StackModeSingleFrame:
return &singleFrameError{
config: config,
underlying: err,
frame: stack.Caller(skip + 1),
}
case StackModeSingleStack:
return &singleStackError{
config: config,
underlying: err,
stack: stack.Callers(skip + 1),
}
case StackModeMultiStack:
return &multiStackError{
config: config,
underlying: err,
multiStack: stack.CallersMulti(skip + 1),
}
}
return err
}
func BenchmarkCallersMulti(b *testing.B) {
for i := 0; i < b.N; i++ {
stack.CallersMulti(0)
}
}
// Chk checks if the error var is nil
// If not it prints the error and stops execution
func Chk(err error) {
if nil != err {
fmt.Println(stack.CallersMulti(0))
log.Fatal(err)
}
}