From 0f343dad0b52977f0d4d4785209f2684ac28a43f Mon Sep 17 00:00:00 2001
From: Vasiliy Tolstov <v.tolstov@unistack.org>
Date: Wed, 8 Feb 2023 14:54:37 +0300
Subject: [PATCH] logger/unwrap: fix for nested tagged/untagged

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
---
 logger/unwrap/unwrap.go | 73 ++++++++++++++++++++++++++++++-----------
 1 file changed, 53 insertions(+), 20 deletions(-)

diff --git a/logger/unwrap/unwrap.go b/logger/unwrap/unwrap.go
index 7d219e6e..93be44d4 100644
--- a/logger/unwrap/unwrap.go
+++ b/logger/unwrap/unwrap.go
@@ -46,6 +46,11 @@ var (
 	closeMapBytes      = []byte("}")
 )
 
+type protoMessage interface {
+	Reset()
+	ProtoMessage()
+}
+
 type Wrapper struct {
 	val              interface{}
 	s                fmt.State
@@ -53,7 +58,7 @@ type Wrapper struct {
 	opts             *Options
 	depth            int
 	ignoreNextType   bool
-	takeAll          map[int]bool
+	takeMap          map[int]bool
 	protoWrapperType bool
 	sqlWrapperType   bool
 }
@@ -111,7 +116,7 @@ func Tagged(b bool) Option {
 
 func Unwrap(val interface{}, opts ...Option) *Wrapper {
 	options := NewOptions(opts...)
-	return &Wrapper{val: val, opts: &options, pointers: make(map[uintptr]int), takeAll: make(map[int]bool)}
+	return &Wrapper{val: val, opts: &options, pointers: make(map[uintptr]int), takeMap: make(map[int]bool)}
 }
 
 func (w *Wrapper) unpackValue(v reflect.Value) reflect.Value {
@@ -237,9 +242,6 @@ func (w *Wrapper) format(v reflect.Value) {
 		_, _ = w.s.Write(buf)
 		return
 	}
-	if w.opts.Tagged {
-		w.checkTakeAll(v, 1)
-	}
 
 	// Handle invalid reflect values immediately.
 	kind := v.Kind()
@@ -256,6 +258,10 @@ func (w *Wrapper) format(v reflect.Value) {
 				w.protoWrapperType = true
 			} else if strings.HasPrefix(reflect.Indirect(v).Type().String(), "sql.Null") {
 				w.sqlWrapperType = true
+			} else if v.CanInterface() {
+				if _, ok := v.Interface().(protoMessage); ok {
+					w.protoWrapperType = true
+				}
 			}
 		}
 		w.formatPtr(v)
@@ -378,6 +384,12 @@ func (w *Wrapper) format(v reflect.Value) {
 		prevSkip := false
 
 		for i := 0; i < numFields; i++ {
+			switch vt.Field(i).Type.PkgPath() {
+			case "google.golang.org/protobuf/internal/impl", "google.golang.org/protobuf/internal/pragma":
+				w.protoWrapperType = true
+				prevSkip = true
+				continue
+			}
 			if w.protoWrapperType && !vt.Field(i).IsExported() {
 				prevSkip = true
 				continue
@@ -385,6 +397,9 @@ func (w *Wrapper) format(v reflect.Value) {
 				prevSkip = true
 				continue
 			}
+			if _, ok := vt.Field(i).Tag.Lookup("protobuf"); ok && !w.protoWrapperType {
+				w.protoWrapperType = true
+			}
 			sv, ok := vt.Field(i).Tag.Lookup("logger")
 			switch {
 			case ok:
@@ -395,11 +410,16 @@ func (w *Wrapper) format(v reflect.Value) {
 				case "take":
 					break
 				}
-			case w.takeAll[w.depth]:
-				break
 			case !ok && w.opts.Tagged:
-				prevSkip = true
-				continue
+				// skip top level untagged
+				if w.depth == 1 {
+					prevSkip = true
+					continue
+				}
+				if tv, ok := w.takeMap[w.depth]; ok && !tv {
+					prevSkip = true
+					continue
+				}
 			}
 
 			if prevSkip {
@@ -416,9 +436,7 @@ func (w *Wrapper) format(v reflect.Value) {
 				_, _ = w.s.Write([]byte(vt.Name))
 				_, _ = w.s.Write(colonBytes)
 			}
-			unpackValue := w.unpackValue(v.Field(i))
-			w.checkTakeAll(unpackValue, w.depth)
-			w.format(unpackValue)
+			w.format(w.unpackValue(v.Field(i)))
 			numWritten++
 		}
 		w.depth--
@@ -461,6 +479,10 @@ func (w *Wrapper) Format(s fmt.State, verb rune) {
 		return
 	}
 
+	if w.opts.Tagged {
+		w.buildTakeMap(reflect.ValueOf(w.val), 1)
+	}
+
 	w.format(reflect.ValueOf(w.val))
 }
 
@@ -615,24 +637,28 @@ func (w *Wrapper) constructOrigFormat(verb rune) string {
 	return buf.String()
 }
 
-func (w *Wrapper) checkTakeAll(v reflect.Value, depth int) {
-	if _, ok := w.takeAll[depth]; ok {
-		return
-	}
+func (w *Wrapper) buildTakeMap(v reflect.Value, depth int) {
 	if !v.IsValid() || v.IsZero() {
 		return
 	}
+
 	switch v.Kind() {
+	case reflect.Slice, reflect.Array:
+		for i := 0; i < v.Len(); i++ {
+			w.buildTakeMap(v.Index(i), depth+1)
+		}
+		w.takeMap[depth] = true
+		return
 	case reflect.Struct:
 		break
 	case reflect.Ptr:
 		v = v.Elem()
 		if v.Kind() != reflect.Struct {
-			w.takeAll[depth] = true
+			w.takeMap[depth] = true
 			return
 		}
 	default:
-		w.takeAll[depth] = true
+		w.takeMap[depth] = true
 		return
 	}
 
@@ -641,8 +667,15 @@ func (w *Wrapper) checkTakeAll(v reflect.Value, depth int) {
 	for i := 0; i < v.NumField(); i++ {
 		sv, ok := vt.Field(i).Tag.Lookup("logger")
 		if ok && sv == "take" {
-			w.takeAll[depth] = false
+			w.takeMap[depth] = false
 		}
-		w.checkTakeAll(v.Field(i), depth+1)
+		if v.Kind() == reflect.Struct ||
+			(v.Kind() == reflect.Ptr && v.Elem().Kind() == reflect.Struct) {
+			w.buildTakeMap(v.Field(i), depth+1)
+		}
+	}
+
+	if _, ok := w.takeMap[depth]; !ok {
+		w.takeMap[depth] = true
 	}
 }