starting filer2

weed/filer2/filer.go

@@ -0,0 +1,94 @@
+package filer2
+
+import (
+	"fmt"
+
+	"github.com/chrislusf/seaweedfs/weed/filer2/embedded"
+	"github.com/karlseguin/ccache"
+	"strings"
+)
+
+type Filer struct {
+	master         string
+	store          FilerStore
+	directoryCache *ccache.Cache
+}
+
+func NewFiler(master string) *Filer {
+	return &Filer{
+		master:         master,
+		directoryCache: ccache.New(ccache.Configure().MaxSize(1000).ItemsToPrune(100)),
+	}
+}
+
+func NewEmbeddedFiler(master string, dir string) (*Filer, error) {
+	_, err := embedded.NewEmbeddedStore(dir)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create embedded filer store: %v", err)
+	}
+	return &Filer{
+		master: master,
+		// store:  store,
+	}, nil
+}
+
+func (f *Filer) CreateEntry(entry Entry) (error) {
+	/*
+	1. recursively ensure parent directory is created.
+	2. get current parent directory, add link,
+	3. add the file entry
+	*/
+
+	f.recursivelyEnsureDirectory(entry.Dir, func(parent, name string) error {
+		return nil
+	})
+
+	return f.store.CreateEntry(entry)
+}
+
+func (f *Filer) AppendFileChunk(p FullPath, c FileChunk) (err error) {
+	return f.store.AppendFileChunk(p, c)
+}
+
+func (f *Filer) FindEntry(p FullPath) (found bool, fileEntry Entry, err error) {
+	return f.store.FindEntry(p)
+}
+
+func (f *Filer) DeleteEntry(p FullPath) (fileEntry Entry, err error) {
+	return f.store.DeleteEntry(p)
+}
+
+func (f *Filer) ListDirectoryEntries(p FullPath) ([]Entry, error) {
+	return f.store.ListDirectoryEntries(p)
+}
+
+func (f *Filer) UpdateEntry(entry Entry) (error) {
+	return f.store.UpdateEntry(entry)
+}
+
+func (f *Filer) recursivelyEnsureDirectory(fullPath string, fn func(parent, name string) error) (error) {
+	if strings.HasSuffix(fullPath, "/") {
+		fullPath = fullPath[0:len(fullPath)-1]
+	}
+	nextPathEnd := strings.LastIndex(fullPath, "/")
+	if nextPathEnd < 0 {
+		return nil
+	}
+
+	dirName := fullPath[nextPathEnd+1:]
+	parentDirPath := fullPath[0:nextPathEnd]
+
+	if parentDirPath == "" {
+		parentDirPath = "/"
+	}
+
+	if err := fn(parentDirPath, dirName); err != nil {
+		return err
+	}
+
+	return f.recursivelyEnsureDirectory(parentDirPath, fn)
+}
+
+func (f *Filer) cacheGetDirectory(dirpath string) (error) {
+	return nil
+}