logger/unwrap: add unwrap method

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

logger/unwrap/unwrap_test.go

@@ -0,0 +1,46 @@
+package unwrap
+
+import (
+	"testing"
+
+	"go.unistack.org/micro/v3/codec"
+)
+
+func TestUnwrap(t *testing.T) {
+	string1 := "string1"
+	string2 := "string2"
+
+	type val1 struct {
+		mp  map[string]string
+		val *val1
+		str *string
+		ar  []*string
+	}
+
+	v1 := &val1{ar: []*string{&string1, &string2}, str: &string1, val: &val1{str: &string2}, mp: map[string]string{"key": "val"}}
+
+	t.Logf("output: %#v", Unwrap(v1))
+
+	type val2 struct {
+		mp  map[string]string
+		val *val2
+		str string
+		ar  []string
+	}
+
+	v2 := &val2{ar: []string{string1, string2}, str: string1, val: &val2{str: string2}, mp: map[string]string{"key": "val"}}
+
+	t.Logf("output: %#v", v2)
+}
+
+func TestUnwrapCodec(t *testing.T) {
+	type val struct {
+		MP  map[string]string `json:"mp"`
+		STR string            `json:"str"`
+		AR  []string          `json:"ar"`
+	}
+
+	v1 := &val{AR: []string{"string1", "string2"}, STR: "string", MP: map[string]string{"key": "val"}}
+
+	t.Logf("output: %#v", Unwrap(v1, UnwrapCodec(codec.NewCodec())))
+}