Initial cloud-services repo - gateway service + pkg modules

pkg/utils/map_helper.go

@@ -0,0 +1,41 @@
+package utils
+
+type MapHelper struct {
+}
+
+func (h *MapHelper) GetString(m map[string]interface{}, key string, defaultVal string) string {
+	val, ok := m[key]
+	if !ok {
+		return defaultVal
+	}
+
+	result, ok := val.(string)
+	if !ok {
+		return defaultVal
+	}
+
+	return result
+}
+
+func (h *MapHelper) GetData(m map[string]interface{}, key string) []byte {
+	val, ok := m[key]
+	if !ok {
+		return nil
+	}
+
+	// TODO maybe there is a better way to serialize and deserialize JSON RPC binary data
+	// Go by default does not convert []uint JSON into []byte. Thus the code below
+	vals, ok := val.([]interface{})
+	if !ok {
+		return nil
+	}
+
+	var x int64
+	result := make([]byte, len(vals))
+	for i, value := range vals {
+		x = int64(value.(float64))
+		result[i] = byte(x)
+	}
+
+	return result
+}