ListOnChannel() - now listbuckets and objects through channel replies.

Still doesn't do full recursive of all objects based on marker, that is the next step.

cmd-ls.go

@@ -52,24 +52,29 @@ func printItem(date time.Time, v int64, name string) {
 
 func doList(clnt client.Client, targetURL string) (string, error) {
 	var err error
-	var items []*client.Item
-
-	items, err = clnt.List()
-	if err != nil && isValidRetry(err) {
-		console.Infof("Retrying ...")
+	for itemOnChannel := range clnt.ListOnChannel() {
+		if itemOnChannel.Err != nil {
+			err = itemOnChannel.Err
+			break
 		}
-	for i := 1; i <= globalMaxRetryFlag && err != nil && isValidRetry(err); i++ {
-		items, err = clnt.List()
-		console.Errorf(" %d", i)
-		// Progressively longer delays
-		time.Sleep(time.Duration(i*i) * time.Second)
+		printItem(itemOnChannel.Item.Time, itemOnChannel.Item.Size, itemOnChannel.Item.Name)
 	}
+	switch iodine.ToError(err).(type) {
+	case client.APINotImplemented:
+		items, err := clnt.List()
 		if err != nil {
 			err = iodine.New(err, nil)
 			msg := fmt.Sprintf("mc: listing objects for URL [%s] failed with following reason: [%s]\n", targetURL, iodine.ToError(err))
 			return msg, err
 		}
 		printItems(items)
+	default:
+		if err != nil {
+			err = iodine.New(err, nil)
+			msg := fmt.Sprintf("mc: listing objects for URL [%s] failed with following reason: [%s]\n", targetURL, iodine.ToError(err))
+			return msg, err
+		}
+	}
 	return "", nil
 }
 

cmd_test.go

@@ -289,6 +289,15 @@ func (s *CmdTestSuite) TestLsCmdWithBucket(c *C) {
 	sourceURLConfigMap[sourceURL] = sourceConfig
 
 	manager.On("getNewClient", sourceURL, sourceConfig, false).Return(cl1, nil).Once()
+	itemCh := make(chan client.ItemOnChannel)
+	go func() {
+		defer close(itemCh)
+		itemCh <- client.ItemOnChannel{
+			Item: nil,
+			Err:  client.APINotImplemented{},
+		}
+	}()
+	cl1.On("ListOnChannel").Return(itemCh).Once()
 	cl1.On("List").Return(items, nil).Once()
 	msg, err := doListCmd(manager, sourceURL, sourceConfig, false)
 	c.Assert(msg, Equals, "")
@@ -323,6 +332,15 @@ func (s *CmdTestSuite) TestLsCmdWithFilePath(c *C) {
 	sourceURLConfigMap[sourceURL] = sourceConfig
 
 	manager.On("getNewClient", sourceURL, sourceConfig, false).Return(cl1, nil).Once()
+	itemCh := make(chan client.ItemOnChannel)
+	go func() {
+		defer close(itemCh)
+		itemCh <- client.ItemOnChannel{
+			Item: nil,
+			Err:  client.APINotImplemented{},
+		}
+	}()
+	cl1.On("ListOnChannel").Return(itemCh).Once()
 	cl1.On("List").Return(items, nil).Once()
 	msg, err := doListCmd(manager, sourceURL, sourceConfig, false)
 	c.Assert(msg, Equals, "")
@@ -351,6 +369,15 @@ func (s *CmdTestSuite) TestLsCmdListsBuckets(c *C) {
 	sourceURLConfigMap[sourceURL] = sourceConfig
 
 	manager.On("getNewClient", sourceURL, sourceConfig, false).Return(cl1, nil).Once()
+	itemCh := make(chan client.ItemOnChannel)
+	go func() {
+		defer close(itemCh)
+		itemCh <- client.ItemOnChannel{
+			Item: nil,
+			Err:  client.APINotImplemented{},
+		}
+	}()
+	cl1.On("ListOnChannel").Return(itemCh).Once()
 	cl1.On("List").Return(buckets, nil).Once()
 	msg, err := doListCmd(manager, sourceURL, sourceConfig, false)
 	c.Assert(msg, Equals, "")

pkg/client/client.go

@@ -30,7 +30,7 @@ type Client interface {
 	// Common operations
 	Stat() error
 	List() (items []*Item, err error)
-	//	ListNew() error
+	ListOnChannel() <-chan ItemOnChannel
 
 	// Bucket operations
 	PutBucket(acl string) error
@@ -67,6 +67,12 @@ type PartItems struct {
 	Part        []*Part
 }
 
+// ItemOnChannel - List items on channel
+type ItemOnChannel struct {
+	Item *Item
+	Err  error
+}
+
 // Item - object item list
 type Item struct {
 	Name string

pkg/client/fs/fs_unix.go

@@ -110,6 +110,20 @@ func (f *fsClient) GetObjectMetadata() (item *client.Item, reterr error) {
 	return item, nil
 }
 
+func (f *fsClient) ListOnChannel() <-chan client.ItemOnChannel {
+	itemCh := make(chan client.ItemOnChannel)
+	go f.listInGoroutine(itemCh)
+	return itemCh
+}
+
+func (f *fsClient) listInGoroutine(itemCh chan client.ItemOnChannel) {
+	defer close(itemCh)
+	itemCh <- client.ItemOnChannel{
+		Item: nil,
+		Err:  iodine.New(client.APINotImplemented{API: "ListOnChannel"}, nil),
+	}
+}
+
 // List - get a list of items
 func (f *fsClient) List() (items []*client.Item, err error) {
 	visitFS := func(fp string, fi os.FileInfo, err error) error {

pkg/client/fs/fs_windows.go

@@ -125,6 +125,20 @@ func (f *fsClient) listBuckets() ([]*client.Item, error) {
 	return results, nil
 }
 
+func (f *fsClient) ListOnChannel() <-chan client.ItemOnChannel {
+	itemCh := make(chan client.ItemOnChannel)
+	go f.listInGoroutine(itemCh)
+	return itemCh
+}
+
+func (f *fsClient) listInGoroutine(itemCh chan client.ItemOnChannel) {
+	defer close(itemCh)
+	itemCh <- client.ItemOnChannel{
+		Item: nil,
+		Err:  iodine.New(client.APINotImplemented{API: "ListOnChannel"}, nil),
+	}
+}
+
 // List - get a list of items
 func (f *fsClient) List() (items []*client.Item, err error) {
 	item, err := f.GetObjectMetadata()

pkg/client/mocks/Client.go

@@ -30,6 +30,13 @@ func (m *Client) Stat() error {
 	return r0
 }
 
+// ListOnChannel is a mock method
+func (m *Client) ListOnChannel() <-chan client.ItemOnChannel {
+	ret := m.Called()
+	r0 := ret.Get(0).(chan client.ItemOnChannel)
+	return r0
+}
+
 // List is a mock method
 func (m *Client) List() ([]*client.Item, error) {
 	ret := m.Called()

pkg/client/s3/bucket_list.go

@@ -34,7 +34,62 @@ import (
 
 /// Bucket API operations
 
-// ListObjects - list objects inside a bucket or with prefix
+// ListOnChannel -
+func (c *s3Client) ListOnChannel() <-chan client.ItemOnChannel {
+	itemCh := make(chan client.ItemOnChannel)
+	go c.listInGoroutine(itemCh)
+	return itemCh
+}
+
+func (c *s3Client) listInGoroutine(itemCh chan client.ItemOnChannel) {
+	defer close(itemCh)
+
+	var items []*client.Item
+	bucket, objectPrefix := c.url2Object()
+	item, err := c.GetObjectMetadata()
+	switch err {
+	case nil: // List a single object. Exact key
+		itemCh <- client.ItemOnChannel{
+			Item: item,
+			Err:  nil,
+		}
+	default:
+		if bucket == "" {
+			items, err = c.listBucketsInternal()
+			if err != nil {
+				itemCh <- client.ItemOnChannel{
+					Item: nil,
+					Err:  iodine.New(err, nil),
+				}
+				return
+			}
+			for _, item := range items {
+				itemCh <- client.ItemOnChannel{
+					Item: item,
+					Err:  nil,
+				}
+			}
+			return
+		}
+		// List all objects matching the key prefix
+		items, err = c.listObjectsInternal(bucket, "", objectPrefix, "", globalMaxKeys)
+		if err != nil {
+			itemCh <- client.ItemOnChannel{
+				Item: nil,
+				Err:  iodine.New(err, nil),
+			}
+			return
+		}
+		for _, item := range items {
+			itemCh <- client.ItemOnChannel{
+				Item: item,
+				Err:  nil,
+			}
+		}
+	}
+}
+
+// List - list objects inside a bucket or with prefix
 func (c *s3Client) List() (items []*client.Item, err error) {
 	bucket, objectPrefix := c.url2Object()
 	item, err := c.GetObjectMetadata()