set filer2.ErrNotFound for not found entry

weed/filer2/abstract_sql/abstract_sql_store.go

@@ -64,7 +64,7 @@ func (store *AbstractSqlStore) FindEntry(fullpath filer2.FullPath) (*filer2.Entr
 	row := store.DB.QueryRow(store.SqlFind, hashToLong(dir), name, dir)
 	var data []byte
 	if err := row.Scan(&data); err != nil {
-		return nil, fmt.Errorf("read entry %s: %v", fullpath, err)
+		return nil, filer2.ErrNotFound
 	}
 
 	entry := &filer2.Entry{

weed/filer2/cassandra/cassandra_store.go

@@ -68,7 +68,7 @@ func (store *CassandraStore) FindEntry(fullpath filer2.FullPath) (entry *filer2.
 		"SELECT meta FROM filemeta WHERE directory=? AND name=?",
 		dir, name).Consistency(gocql.One).Scan(&data); err != nil {
 		if err != gocql.ErrNotFound {
-			return nil, fmt.Errorf("read entry %s: %v", fullpath, err)
+			return nil, filer2.ErrNotFound
 		}
 	}
 

weed/filer2/filerstore.go

@@ -11,6 +11,7 @@ type FilerStore interface {
 	Initialize(configuration Configuration) error
 	InsertEntry(*Entry) error
 	UpdateEntry(*Entry) (err error)
+	// err == filer2.ErrNotFound if not found
 	FindEntry(FullPath) (entry *Entry, err error)
 	DeleteEntry(FullPath) (err error)
 	ListDirectoryEntries(dirPath FullPath, startFileName string, includeStartFile bool, limit int) ([]*Entry, error)

weed/filer2/memdb/memdb_store.go

@@ -49,7 +49,7 @@ func (store *MemDbStore) UpdateEntry(entry *filer2.Entry) (err error) {
 func (store *MemDbStore) FindEntry(fullpath filer2.FullPath) (entry *filer2.Entry, err error) {
 	item := store.tree.Get(entryItem{&filer2.Entry{FullPath: fullpath}})
 	if item == nil {
-		return nil, nil
+		return nil, filer2.ErrNotFound
 	}
 	entry = item.(entryItem).Entry
 	return entry, nil

weed/server/filer_server_handlers_write.go

@@ -27,20 +27,26 @@ type FilerPostResult struct {
 
 func (fs *FilerServer) queryFileInfoByPath(w http.ResponseWriter, r *http.Request, path string) (fileId, urlLocation string, err error) {
 	var entry *filer2.Entry
-	if entry, err = fs.filer.FindEntry(filer2.FullPath(path)); err != nil {
+	entry, err = fs.filer.FindEntry(filer2.FullPath(path))
+	if err == filer2.ErrNotFound {
+		return "", "", nil
+	}
+
+	if err != nil {
 		glog.V(0).Infoln("failing to find path in filer store", path, err.Error())
 		writeJsonError(w, r, http.StatusInternalServerError, err)
+		return
+	}
+
+	if len(entry.Chunks) == 0 {
+		glog.V(1).Infof("empty entry: %s", path)
+		w.WriteHeader(http.StatusNoContent)
 	} else {
-		if len(entry.Chunks) == 0 {
-			glog.V(1).Infof("empty entry: %s", path)
-			w.WriteHeader(http.StatusNoContent)
-		}else{
-			fileId = entry.Chunks[0].FileId
-			urlLocation, err = operation.LookupFileId(fs.filer.GetMaster(), fileId)
-			if err != nil {
-				glog.V(1).Infof("operation LookupFileId %s failed, err is %s", fileId, err.Error())
-				w.WriteHeader(http.StatusNotFound)
-			}
+		fileId = entry.Chunks[0].FileId
+		urlLocation, err = operation.LookupFileId(fs.filer.GetMaster(), fileId)
+		if err != nil {
+			glog.V(1).Infof("operation LookupFileId %s failed, err is %s", fileId, err.Error())
+			w.WriteHeader(http.StatusNotFound)
 		}
 	}
 	return