Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

plugins/parsers/json/json_flattener.go

@@ -0,0 +1,70 @@
+package json
+
+import (
+	"fmt"
+	"strconv"
+)
+
+type JSONFlattener struct {
+	Fields map[string]interface{}
+}
+
+// FlattenJSON flattens nested maps/interfaces into a fields map (ignoring bools and string)
+func (f *JSONFlattener) FlattenJSON(
+	fieldname string,
+	v interface{}) error {
+	if f.Fields == nil {
+		f.Fields = make(map[string]interface{})
+	}
+
+	return f.FullFlattenJSON(fieldname, v, false, false)
+}
+
+// FullFlattenJSON flattens nested maps/interfaces into a fields map (including bools and string)
+func (f *JSONFlattener) FullFlattenJSON(fieldName string, v interface{}, convertString, convertBool bool) error {
+	if f.Fields == nil {
+		f.Fields = make(map[string]interface{})
+	}
+
+	switch t := v.(type) {
+	case map[string]interface{}:
+		for fieldKey, fieldVal := range t {
+			if fieldName != "" {
+				fieldKey = fieldName + "_" + fieldKey
+			}
+
+			err := f.FullFlattenJSON(fieldKey, fieldVal, convertString, convertBool)
+			if err != nil {
+				return err
+			}
+		}
+	case []interface{}:
+		for i, fieldVal := range t {
+			fieldKey := strconv.Itoa(i)
+			if fieldName != "" {
+				fieldKey = fieldName + "_" + fieldKey
+			}
+			err := f.FullFlattenJSON(fieldKey, fieldVal, convertString, convertBool)
+			if err != nil {
+				return err
+			}
+		}
+	case float64:
+		f.Fields[fieldName] = t
+	case string:
+		if !convertString {
+			return nil
+		}
+		f.Fields[fieldName] = v.(string)
+	case bool:
+		if !convertBool {
+			return nil
+		}
+		f.Fields[fieldName] = v.(bool)
+	case nil:
+		return nil
+	default:
+		return fmt.Errorf("json flattener: got unexpected type %T with value %v (%s)", t, t, fieldName)
+	}
+	return nil
+}