FAB-15519 remove viperutil.EnhancedExactUnmarshalKey

FAB-15519 #done

Change-Id: I93678d6907bbde18f8cc11dba086031699cba9ad
Signed-off-by: Jay Guo <guojiannan1101@gmail.com>

Author: guoger

common/viperutil/config_test.go

@@ -445,54 +445,6 @@ func TestStringFromFileEnv(t *testing.T) {
 
 }
 
-func TestEnhancedExactUnmarshalKey(t *testing.T) {
-	type Nested struct {
-		Key     string
-		BoolVar bool
-	}
-
-	type nestedKey struct {
-		Nested Nested
-	}
-
-	yaml := "---\n" +
-		"Top:\n" +
-		"  Nested:\n" +
-		"    Nested:\n" +
-		"      Key: BAD\n" +
-		"      BoolVar: true\n"
-
-	envVar := "VIPERUTIL_TOP_NESTED_NESTED_KEY"
-	envVal := "GOOD"
-	os.Setenv(envVar, envVal)
-	defer os.Unsetenv(envVar)
-
-	viper.SetEnvPrefix(Prefix)
-	defer viper.Reset()
-	viper.AutomaticEnv()
-	replacer := strings.NewReplacer(".", "_")
-	viper.SetEnvKeyReplacer(replacer)
-	viper.SetConfigType("yaml")
-
-	if err := viper.ReadConfig(bytes.NewReader([]byte(yaml))); err != nil {
-		t.Fatalf("Error reading config: %s", err)
-	}
-
-	var uconf nestedKey
-	if err := EnhancedExactUnmarshalKey("top.Nested", &uconf); err != nil {
-		t.Fatalf("Failed to unmarshall: %s", err)
-	}
-
-	if uconf.Nested.Key != envVal {
-		t.Fatalf(`Expected: "%s", Actual: "%s"`, envVal, uconf.Nested.Key)
-	}
-
-	if uconf.Nested.BoolVar != true {
-		t.Fatalf(`Expected: "%t", Actual: "%t"`, true, uconf.Nested.BoolVar)
-	}
-
-}
-
 func TestDecodeOpaqueField(t *testing.T) {
 	yaml := `---
 Foo: bar

common/viperutil/config_util.go

@@ -313,25 +313,3 @@ func EnhancedExactUnmarshal(v *viper.Viper, output interface{}) error {
 	}
 	return decoder.Decode(leafKeys)
 }
-
-// EnhancedExactUnmarshalKey is intended to unmarshal a config file subtreee into a structure
-func EnhancedExactUnmarshalKey(baseKey string, output interface{}) error {
-	m := make(map[string]interface{})
-	m[baseKey] = nil
-	leafKeys := getKeysRecursively("", viper.Get, m)
-
-	logger.Debugf("%+v", leafKeys)
-
-	config := &mapstructure.DecoderConfig{
-		Metadata:         nil,
-		Result:           output,
-		WeaklyTypedInput: true,
-	}
-
-	decoder, err := mapstructure.NewDecoder(config)
-	if err != nil {
-		return err
-	}
-
-	return decoder.Decode(leafKeys[baseKey])
-}