aws/dynamo/dynamo: add pkg

aws/dynamo/dynamo.go

@@ -0,0 +1,35 @@
+// Package dynamo provides dynamodb utilities.
+package dynamo
+
+import (
+	"github.com/aws/aws-sdk-go/service/dynamodb"
+	"github.com/aws/aws-sdk-go/service/dynamodb/dynamodbattribute"
+)
+
+// Item is a map of attributes.
+type Item map[string]*dynamodb.AttributeValue
+
+// Marshal returns a new item from struct.
+func Marshal(value interface{}) (Item, error) {
+	v, err := dynamodbattribute.MarshalMap(value)
+	if err != nil {
+		return nil, err
+	}
+
+	return Item(v), nil
+}
+
+// MustMarshal returns a new item from struct.
+func MustMarshal(value interface{}) Item {
+	v, err := dynamodbattribute.MarshalMap(value)
+	if err != nil {
+		panic(err)
+	}
+
+	return Item(v)
+}
+
+// Unmarshal the item.
+func Unmarshal(i Item, value interface{}) error {
+	return dynamodbattribute.UnmarshalMap(i, value)
+}