func deepStack(depth int, b *testing.B) stack.CallStack {
if depth > 0 {
return deepStack(depth-1, b)
}
b.StartTimer()
s := stack.Trace()
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
// package github.com/go-stack/stack for the list of supported formats.
func CallerStackHandler(format string, h Handler) Handler {
return FuncHandler(func(r *Record) error {
s := stack.Trace().TrimBelow(r.Call).TrimRuntime()
if len(s) > 0 {
r.Ctx = append(r.Ctx, "stack", fmt.Sprintf(format, s))
}
return h.Log(r)
})
}
func getTrace(t *testing.T) (stack.CallStack, int) {
cs := stack.Trace().TrimRuntime()
_, _, line, ok := runtime.Caller(0)
line--
if !ok {
t.Fatal("runtime.Caller(0) failed")
}
return cs, line
}
// Test that Context.Log has a consistent function stack depth when binding
// log.Valuers, regardless of how many times Context.With has been called or
// whether Context.Log is called via an interface typed variable or a concrete
// typed variable.
func TestContextStackDepth(t *testing.T) {
t.Parallel()
fn := fmt.Sprintf("%n", stack.Caller(0))
var output []interface{}
logger := log.Logger(log.LoggerFunc(func(keyvals ...interface{}) error {
output = keyvals
return nil
}))
stackValuer := log.Valuer(func() interface{} {
for i, c := range stack.Trace() {
if fmt.Sprintf("%n", c) == fn {
return i
}
}
t.Fatal("Test function not found in stack trace.")
return nil
})
concrete := log.NewContext(logger).With("stack", stackValuer)
var iface log.Logger = concrete
// Call through interface to get baseline.
iface.Log("k", "v")
want := output[1].(int)
for len(output) < 10 {
concrete.Log("k", "v")
if have := output[1]; have != want {
t.Errorf("%d Withs: have %v, want %v", len(output)/2-1, have, want)
}
iface.Log("k", "v")
if have := output[1]; have != want {
t.Errorf("%d Withs: have %v, want %v", len(output)/2-1, have, want)
}
wrapped := log.NewContext(concrete)
wrapped.Log("k", "v")
if have := output[1]; have != want {
t.Errorf("%d Withs: have %v, want %v", len(output)/2-1, have, want)
}
concrete = concrete.With("k", "v")
iface = concrete
}
}
func Stack(skip int) string {
call := stack.Caller(skip)
s := stack.Trace().TrimBelow(call).TrimRuntime()
return s.String()
}
func BenchmarkTraceAndVFmt(b *testing.B) {
for i := 0; i < b.N; i++ {
fmt.Fprint(ioutil.Discard, stack.Trace())
}
}
func BenchmarkTrace(b *testing.B) {
for i := 0; i < b.N; i++ {
stack.Trace()
}
}
func TestTrimRuntime(t *testing.T) {
trace := stack.Trace().TrimRuntime()
if got, want := len(trace), 1; got != want {
t.Errorf("got len(trace) == %v, want %v, goroot: %q, trace: %#v", got, want, runtime.GOROOT(), trace)
}
}
func trimBelow() stack.CallStack {
call := stack.Caller(1)
trace := stack.Trace()
return trace.TrimBelow(call)
}
func trimAbove() stack.CallStack {
call := stack.Caller(1)
trace := stack.Trace()
return trace.TrimAbove(call)
}