Adding error support to all commands in storage interface

pkg/storage/inmemory/inmemory.go

@@ -86,12 +86,12 @@ func (storage *storage) StoreBucket(bucketName string) error {
 	return nil
 }
 
-func (storage *storage) ListObjects(bucket, prefix string, count int) ([]mstorage.ObjectMetadata, bool) {
+func (storage *storage) ListObjects(bucket, prefix string, count int) ([]mstorage.ObjectMetadata, bool, error) {
 	// TODO prefix and count handling
 	var results []mstorage.ObjectMetadata
 	for key, object := range storage.objectdata {
 		if len(results) == count {
-			return results, true
+			return results, true, nil
 		}
 		if bucket == object.metadata.Bucket {
 			if strings.HasPrefix(key, bucket+":") {
@@ -99,16 +99,16 @@ func (storage *storage) ListObjects(bucket, prefix string, count int) ([]mstorag
 			}
 		}
 	}
-	return results, false
+	return results, false, nil
 }
 
-func (storage *storage) ListBuckets(prefix string) []mstorage.BucketMetadata {
+func (storage *storage) ListBuckets(prefix string) ([]mstorage.BucketMetadata, error) {
 	// TODO prefix handling
 	var results []mstorage.BucketMetadata
 	for _, bucket := range storage.bucketdata {
 		results = append(results, bucket.metadata)
 	}
-	return results
+	return results, nil
 }
 
 func Start() (chan<- string, <-chan error, *storage) {

pkg/storage/storage.go

@@ -24,14 +24,14 @@ import (
 
 type Storage interface {
 	// Bucket Operations
+	ListBuckets(prefix string) ([]BucketMetadata, error)
 	StoreBucket(bucket string) error
-	ListBuckets(prefix string) []BucketMetadata
 
 	// Object Operations
-	GetObjectMetadata(bucket string, object string) (ObjectMetadata, error)
 	CopyObjectToWriter(w io.Writer, bucket string, object string) (int64, error)
+	GetObjectMetadata(bucket string, object string) (ObjectMetadata, error)
+	ListObjects(bucket, prefix string, count int) ([]ObjectMetadata, bool, error)
 	StoreObject(bucket string, key string, data io.Reader) error
-	ListObjects(bucket, prefix string, count int) ([]ObjectMetadata, bool)
 }
 
 type BucketMetadata struct {

pkg/storage/storage_api_suite.go

@@ -61,22 +61,25 @@ func testPaging(c *C, create func() Storage) {
 	storage := create()
 	storage.StoreBucket("bucket")
 	storage.ListObjects("bucket", "", 1000)
-	objects, isTruncated := storage.ListObjects("bucket", "", 1000)
+	objects, isTruncated, err := storage.ListObjects("bucket", "", 1000)
 	c.Assert(len(objects), Equals, 0)
 	c.Assert(isTruncated, Equals, false)
+	c.Assert(err, IsNil)
 	for i := 1; i <= 1000; i++ {
 		key := "obj" + strconv.Itoa(i)
 		storage.StoreObject("bucket", key, bytes.NewBufferString(key))
-		objects, isTruncated = storage.ListObjects("bucket", "", 1000)
+		objects, isTruncated, err = storage.ListObjects("bucket", "", 1000)
 		c.Assert(len(objects), Equals, i)
 		c.Assert(isTruncated, Equals, false)
+		c.Assert(err, IsNil)
 	}
 	for i := 1001; i <= 2000; i++ {
 		key := "obj" + strconv.Itoa(i)
 		storage.StoreObject("bucket", key, bytes.NewBufferString(key))
-		objects, isTruncated = storage.ListObjects("bucket", "", 1000)
+		objects, isTruncated, err = storage.ListObjects("bucket", "", 1000)
 		c.Assert(len(objects), Equals, 1000)
 		c.Assert(isTruncated, Equals, true)
+		c.Assert(err, IsNil)
 	}
 }
 

pkg/webapi/minioapi/minioapi.go

@@ -153,7 +153,12 @@ func (server *minioApi) listBucketsHandler(w http.ResponseWriter, req *http.Requ
 			contentType = jsonType
 		}
 	}
-	buckets := server.storage.ListBuckets(prefix)
+	buckets, err := server.storage.ListBuckets(prefix)
+	if err != nil {
+		log.Println(err)
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	}
 	response := generateBucketsListResult(buckets)
 
 	var bytesBuffer bytes.Buffer
@@ -189,7 +194,12 @@ func (server *minioApi) listObjectsHandler(w http.ResponseWriter, req *http.Requ
 		}
 	}
 
-	objects, isTruncated := server.storage.ListObjects(bucket, prefix, 1000)
+	objects, isTruncated, err := server.storage.ListObjects(bucket, prefix, 1000)
+	if err != nil {
+		log.Println(err)
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	}
 	response := generateObjectsListResult(bucket, objects, isTruncated)
 
 	var bytesBuffer bytes.Buffer

pkg/webapi/minioapi/minioapi_test.go

@@ -214,8 +214,9 @@ func (s *MySuite) TestPutBucket(c *C) {
 	testServer := httptest.NewServer(httpHandler)
 	defer testServer.Close()
 
-	buckets := storage.ListBuckets("bucket")
+	buckets, err := storage.ListBuckets("bucket")
 	c.Assert(len(buckets), Equals, 0)
+	c.Assert(err, IsNil)
 
 	request, err := http.NewRequest("PUT", testServer.URL+"/bucket/", bytes.NewBufferString(""))
 	c.Assert(err, IsNil)
@@ -226,8 +227,9 @@ func (s *MySuite) TestPutBucket(c *C) {
 	c.Assert(response.StatusCode, Equals, http.StatusOK)
 
 	// check bucket exists
-	buckets = storage.ListBuckets("bucket")
+	buckets, err = storage.ListBuckets("bucket")
 	c.Assert(len(buckets), Equals, 1)
+	c.Assert(err, IsNil)
 	c.Assert(buckets[0].Name, Equals, "bucket")
 }
 
@@ -237,8 +239,10 @@ func (s *MySuite) TestPutObject(c *C) {
 	testServer := httptest.NewServer(httpHandler)
 	defer testServer.Close()
 
-	objects, _ := storage.ListObjects("bucket", "", 1000)
+	objects, isTruncated, err := storage.ListObjects("bucket", "", 1000)
 	c.Assert(len(objects), Equals, 0)
+	c.Assert(isTruncated, Equals, false)
+	c.Assert(err, IsNil)
 
 	date1 := time.Now()
 
@@ -260,8 +264,10 @@ func (s *MySuite) TestPutObject(c *C) {
 
 	date2 := time.Now()
 
-	objects, _ = storage.ListObjects("bucket", "", 1000)
+	objects, isTruncated, err = storage.ListObjects("bucket", "", 1000)
 	c.Assert(len(objects), Equals, 1)
+	c.Assert(isTruncated, Equals, false)
+	c.Assert(err, IsNil)
 
 	var writer bytes.Buffer