Adding GetObjectMetadata to donut

pkg/storage/donut/donut.go

@@ -10,7 +10,7 @@ type Donut interface {
 	ListBuckets() ([]string, error)
 	GetObjectWriter(bucket, object string) (ObjectWriter, error)
 	GetObject(bucket, object string) (io.ReadCloser, error)
-	//	GetObjectMetadata(bucket, object string) (map[string]string, error)
+	GetObjectMetadata(bucket, object string) (map[string]string, error)
 	//	GetObjectWriter(bucket, object string) (ObjectWriter, error)
 	//	ListObjects(bucket string) ([]string, error)
 }

pkg/storage/donut/donutdriver.go

@@ -113,6 +113,21 @@ func (driver donutDriver) GetObject(bucketName, objectName string) (io.ReadClose
 	return nil, errors.New("Bucket not found")
 }
 
+// GetObjectMetadata returns metadata for a given object in a bucket
+func (driver donutDriver) GetObjectMetadata(bucketName, object string) (map[string]string, error) {
+	if bucket, ok := driver.buckets[bucketName]; ok {
+		nodes, err := bucket.GetNodes()
+		if err != nil {
+			return nil, err
+		}
+		if node, ok := driver.nodes[nodes[0]]; ok {
+			return node.GetMetadata(bucketName+":0:0", object)
+		}
+		return nil, errors.New("Cannot connect to node: " + nodes[0])
+	}
+	return nil, errors.New("Bucket not found")
+}
+
 func erasureReader(readers []io.ReadCloser, donutMetadata map[string]string, writer *io.PipeWriter) {
 	totalChunks, _ := strconv.Atoi(donutMetadata["chunkCount"])
 	totalLeft, _ := strconv.Atoi(donutMetadata["totalLength"])

pkg/storage/donut/donutdriver_test.go

@@ -7,6 +7,7 @@ import (
 	. "gopkg.in/check.v1"
 	"io"
 	"io/ioutil"
+	"log"
 	"os"
 )
 
@@ -159,6 +160,11 @@ func (s *MySuite) TestNewObjectCanBeWritten(c *C) {
 	_, err = io.Copy(&actualData, reader)
 	c.Assert(err, IsNil)
 	c.Assert(actualData.Bytes(), DeepEquals, []byte(data))
+
+	actualMetadata, err := donut.GetObjectMetadata("foo", "obj")
+	c.Assert(err, IsNil)
+	log.Println(actualMetadata)
+	c.Assert(actualMetadata, DeepEquals, expectedMetadata)
 }
 
 func (s *MySuite) TestMultipleNewObjects(c *C) {