func deepStack(depth int, b *testing.B) stack.Trace {
if depth > 0 {
return deepStack(depth-1, b)
}
b.StartTimer()
s := stack.Callers()
b.StopTimer()
return s
}
// CallerStackHandler returns a Handler that adds a stack trace to the context
// with key "stack". The stack trace is formated as a space separated list of
// call sites inside matching []'s. The most recent call site is listed first.
// Each call site is formatted according to format. See the documentation of
// log15/stack.Call.Format for the list of supported formats.
func CallerStackHandler(format string, h Handler) Handler {
return FuncHandler(func(r *Record) error {
s := stack.Callers().
TrimBelow(stack.Call(r.CallPC[0])).
TrimRuntime()
if len(s) > 0 {
buf := &bytes.Buffer{}
buf.WriteByte('[')
for i, pc := range s {
if i > 0 {
buf.WriteByte(' ')
}
fmt.Fprintf(buf, format, pc)
}
buf.WriteByte(']')
r.Ctx = append(r.Ctx, "stack", buf.String())
}
return h.Log(r)
})
}
func BenchmarkCallers(b *testing.B) {
for i := 0; i < b.N; i++ {
stack.Callers()
}
}