add better listing directory entries

weed/filer2/embedded/embedded_store.go

@@ -37,6 +37,6 @@ func (filer *EmbeddedStore) DeleteEntry(fullpath filer2.FullPath) (entry *filer2
 	return nil, nil
 }
 
-func (filer *EmbeddedStore) ListDirectoryEntries(fullpath filer2.FullPath) (entries []*filer2.Entry, err error) {
+func (filer *EmbeddedStore) ListDirectoryEntries(fullpath filer2.FullPath, startFileName string, inclusive bool, limit int) (entries []*filer2.Entry, err error) {
 	return nil, nil
 }

weed/filer2/filer.go

@@ -117,11 +117,11 @@ func (f *Filer) DeleteEntry(p FullPath) (fileEntry *Entry, err error) {
 	return f.store.DeleteEntry(p)
 }
 
-func (f *Filer) ListDirectoryEntries(p FullPath) ([]*Entry, error) {
+func (f *Filer) ListDirectoryEntries(p FullPath, startFileName string, inclusive bool, limit int) ([]*Entry, error) {
 	if strings.HasSuffix(string(p), "/") {
 		p = p[0:len(p)-1]
 	}
-	return f.store.ListDirectoryEntries(p)
+	return f.store.ListDirectoryEntries(p, startFileName, inclusive, limit)
 }
 
 func (f *Filer) cacheGetDirectory(dirpath string) (*Entry) {

weed/filer2/filer_structure.go

@@ -62,5 +62,5 @@ type FilerStore interface {
 	FindEntry(FullPath) (found bool, entry *Entry, err error)
 	DeleteEntry(FullPath) (fileEntry *Entry, err error)
 
-	ListDirectoryEntries(dirPath FullPath) ([]*Entry, error)
+	ListDirectoryEntries(dirPath FullPath, startFileName string, inclusive bool, limit int) ([]*Entry, error)
 }

weed/filer2/memdb/memdb_store.go

@@ -60,9 +60,18 @@ func (filer *MemDbStore) DeleteEntry(fullpath filer2.FullPath) (entry *filer2.En
 	return entry, nil
 }
 
-func (filer *MemDbStore) ListDirectoryEntries(fullpath filer2.FullPath) (entries []*filer2.Entry, err error) {
-	filer.tree.AscendGreaterOrEqual(Entry{&filer2.Entry{FullPath: fullpath}},
+func (filer *MemDbStore) ListDirectoryEntries(fullpath filer2.FullPath, startFileName string, inclusive bool, limit int) (entries []*filer2.Entry, err error) {
+
+	startFrom := string(fullpath)
+	if startFileName != "" {
+		startFrom = startFrom + "/" + startFileName
+	}
+
+	filer.tree.AscendGreaterOrEqual(Entry{&filer2.Entry{FullPath: filer2.FullPath(startFrom)}},
 		func(item btree.Item) bool {
+			if limit <= 0 {
+				return false
+			}
 			entry := item.(Entry).Entry
 			// println("checking", entry.FullPath)
 			if entry.FullPath == fullpath {
@@ -70,7 +79,14 @@ func (filer *MemDbStore) ListDirectoryEntries(fullpath filer2.FullPath) (entries
 				// println("skipping the folder", entry.FullPath)
 				return true
 			}
-			dir, _ := entry.FullPath.DirAndName()
+			dir, name := entry.FullPath.DirAndName()
+			if name == startFileName {
+				if inclusive {
+					limit--
+					entries = append(entries, entry)
+				}
+				return true
+			}
 			if !strings.HasPrefix(dir, string(fullpath)) {
 				// println("directory is:", dir, "fullpath:", fullpath)
 				// println("breaking from", entry.FullPath)
@@ -83,6 +99,7 @@ func (filer *MemDbStore) ListDirectoryEntries(fullpath filer2.FullPath) (entries
 			}
 			// now process the directory items
 			// println("adding entry", entry.FullPath)
+			limit--
 			entries = append(entries, entry)
 			return true
 		},

weed/filer2/memdb/memdb_store_test.go

@@ -72,7 +72,7 @@ func TestCreateFileAndList(t *testing.T) {
 	filer.CreateEntry(entry2)
 
 	// checking the 2 files
-	entries, err := filer.ListDirectoryEntries(filer2.FullPath("/home/chris/this/is/one/"))
+	entries, err := filer.ListDirectoryEntries(filer2.FullPath("/home/chris/this/is/one/"), "", false, 100)
 
 	if err != nil {
 		t.Errorf("list entries: %v", err)
@@ -94,8 +94,15 @@ func TestCreateFileAndList(t *testing.T) {
 		return
 	}
 
+	// checking the offset
+	entries, err = filer.ListDirectoryEntries(filer2.FullPath("/home/chris/this/is/one/"), "file1.jpg", false, 100)
+	if len(entries) != 1 {
+		t.Errorf("list entries count: %v", len(entries))
+		return
+	}
+
 	// checking one upper directory
-	entries, _ = filer.ListDirectoryEntries(filer2.FullPath("/home/chris/this/is"))
+	entries, _ = filer.ListDirectoryEntries(filer2.FullPath("/home/chris/this/is"), "", false, 100)
 	if len(entries) != 1 {
 		t.Errorf("list entries count: %v", len(entries))
 		return
@@ -113,7 +120,7 @@ func TestCreateFileAndList(t *testing.T) {
 	filer.CreateEntry(entry3)
 
 	// checking one upper directory
-	entries, _ = filer.ListDirectoryEntries(filer2.FullPath("/home/chris/this/is"))
+	entries, _ = filer.ListDirectoryEntries(filer2.FullPath("/home/chris/this/is"), "", false, 100)
 	if len(entries) != 2 {
 		t.Errorf("list entries count: %v", len(entries))
 		return
@@ -121,7 +128,7 @@ func TestCreateFileAndList(t *testing.T) {
 
 	// delete file and count
 	filer.DeleteEntry(file3Path)
-	entries, _ = filer.ListDirectoryEntries(filer2.FullPath("/home/chris/this/is"))
+	entries, _ = filer.ListDirectoryEntries(filer2.FullPath("/home/chris/this/is"), "", false, 100)
 	if len(entries) != 1 {
 		t.Errorf("list entries count: %v", len(entries))
 		return