initial stuff for wrappers

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

logger/unwrap/unwrap.go

@@ -235,12 +235,71 @@ func (f *unwrap) format(v reflect.Value) {
 		return
 	}
 
-	// Handle pointers specially.
-	if kind == reflect.Ptr {
+	if (kind == reflect.Ptr) && (!reflect.Indirect(v).IsValid()) {
 		f.formatPtr(v)
 		return
 	}
 
+	// Handle pointers specially.
+	if kind == reflect.Ptr {
+		fmt.Printf("AAAA %s\n", reflect.Indirect(v).Type().String())
+		switch reflect.Indirect(v).Type().String() {
+		case "sql.NullBool":
+			if eva := reflect.Indirect(v).FieldByName("Valid"); eva.IsValid() && eva.Bool() {
+				v = reflect.Indirect(v).FieldByName("Bool")
+				kind = v.Kind()
+			}
+		case "sql.NullByte":
+			if eva := reflect.Indirect(v).FieldByName("Valid"); eva.IsValid() && eva.Bool() {
+				v = reflect.Indirect(v).FieldByName("Byte")
+				kind = v.Kind()
+			}
+		case "sql.NullFloat64":
+			if eva := reflect.Indirect(v).FieldByName("Valid"); eva.IsValid() && eva.Bool() {
+				v = reflect.Indirect(v).FieldByName("Float64")
+				kind = v.Kind()
+			}
+		case "sql.NullInt16":
+			if eva := reflect.Indirect(v).FieldByName("Valid"); eva.IsValid() && eva.Bool() {
+				v = reflect.Indirect(v).FieldByName("Int16")
+				kind = v.Kind()
+			}
+		case "sql.NullInt32":
+			if eva := reflect.Indirect(v).FieldByName("Valid"); eva.IsValid() && eva.Bool() {
+				v = reflect.Indirect(v).FieldByName("Int32")
+				kind = v.Kind()
+			}
+		case "sql.NullInt64":
+			if eva := reflect.Indirect(v).FieldByName("Valid"); eva.IsValid() && eva.Bool() {
+				v = reflect.Indirect(v).FieldByName("Int64")
+				kind = v.Kind()
+			}
+		case "sql.NullString":
+			fmt.Printf("AAAAAAAAAA")
+			if eva := reflect.Indirect(v).FieldByName("Valid"); eva.IsValid() && eva.Bool() {
+				v = reflect.Indirect(v).FieldByName("String")
+				kind = v.Kind()
+			}
+		case "sql.NullTime":
+			if eva := reflect.Indirect(v).FieldByName("Valid"); eva.IsValid() && eva.Bool() {
+				v = reflect.Indirect(v).FieldByName("Time")
+				kind = v.Kind()
+			}
+		case "wrapperspb.BoolValue", "wrapperspb.BytesValue",
+			"wrapperspb.DoubleValue", "wrapperspb.FloatValue",
+			"wrapperspb.Int32Value", "wrapperspb.Int64Value",
+			"wrapperspb.UInt32Value", "wrapperspb.UInt64Value",
+			"wrapperspb.StringValue":
+			if eva := reflect.Indirect(v).FieldByName("Value"); eva.IsValid() {
+				v = eva
+				kind = v.Kind()
+			}
+		default:
+			f.formatPtr(v)
+			return
+		}
+	}
+
 	// get type information unless already handled elsewhere.
 	if !f.ignoreNextType && f.s.Flag('#') {
 		if v.Type().Kind() != reflect.Map &&

logger/unwrap/unwrap_test.go

@@ -1,6 +1,7 @@
 package unwrap
 
 import (
+	"database/sql"
 	"fmt"
 	"strings"
 	"testing"
@@ -8,6 +9,15 @@ import (
 	"go.unistack.org/micro/v3/codec"
 )
 
+func TestSql(t *testing.T) {
+	type val struct {
+		S sql.NullString
+	}
+	v := &val{S: sql.NullString{Valid: true, String: "test"}}
+	buf := fmt.Sprintf("%#v", Unwrap(v))
+	t.Logf(buf)
+}
+
 func TestUnwrap(t *testing.T) {
 	string1 := "string1"
 	string2 := "string2"
@@ -22,8 +32,9 @@ func TestUnwrap(t *testing.T) {
 	v1 := &val1{ar: []*string{&string1, &string2}, str: &string1, val: &val1{str: &string2}, mp: map[string]string{"key": "val"}}
 
 	buf := fmt.Sprintf("%#v", Unwrap(v1))
-	if strings.Compare(buf, `&unwrap.val1{mp:map[string]string{"key":"val"}, val:(*unwrap.val1){mp:map[string]string<nil>, val:(*unwrap.val1)<nil>, str:(*string)"string2", ar:[]*string<nil>}, str:(*string)"string1", ar:[]*string{<*><shown>, <*>"string2"}}`) != 0 {
-		t.Fatalf("not proper written %s", buf)
+	chk := `&unwrap.val1{mp:map[string]string{"key":"val"}, val:(*unwrap.val1){mp:map[string]string<nil>, val:(*unwrap.val1)<nil>, str:(*string)"string2", ar:[]*string<nil>}, str:(*string)"string1", ar:[]*string{<*><shown>, <*>"string2"}}`
+	if strings.Compare(buf, chk) != 0 {
+		t.Fatalf("not proper written\n%s\n%s", buf, chk)
 	}
 
 	type val2 struct {