mysql can compile, not yet tested!

weed/filer2/abstract_sql/abstract_sql_store.go

@@ -0,0 +1,121 @@
+package abstract_sql
+
+import (
+	"fmt"
+	"database/sql"
+
+	"github.com/chrislusf/seaweedfs/weed/filer2"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+)
+
+type AbstractSqlStore struct {
+	DB *sql.DB
+}
+
+func (store *AbstractSqlStore) InsertEntry(entry *filer2.Entry) (err error) {
+
+	dir, name := entry.FullPath.DirAndName()
+	meta, err := entry.EncodeAttributesAndChunks()
+	if err != nil {
+		return fmt.Errorf("mysql encode %s: %s", entry.FullPath, err)
+	}
+
+	res, err := store.DB.Exec("INSERT INTO seaweedfs (directory,name,meta) VALUES(?,?,?)", dir, name, meta)
+	if err != nil {
+		return fmt.Errorf("mysql insert %s: %s", entry.FullPath, err)
+	}
+
+	_, err = res.RowsAffected()
+	if err != nil {
+		return fmt.Errorf("mysql insert %s but no rows affected: %s", entry.FullPath, err)
+	}
+	return nil
+}
+
+func (store *AbstractSqlStore) UpdateEntry(entry *filer2.Entry) (err error) {
+
+	dir, name := entry.FullPath.DirAndName()
+	meta, err := entry.EncodeAttributesAndChunks()
+	if err != nil {
+		return fmt.Errorf("mysql encode %s: %s", entry.FullPath, err)
+	}
+
+	res, err := store.DB.Exec("UPDATE seaweedfs SET meta=? WHERE directory=? and name=?", dir, name, meta)
+	if err != nil {
+		return fmt.Errorf("mysql update %s: %s", entry.FullPath, err)
+	}
+
+	_, err = res.RowsAffected()
+	if err != nil {
+		return fmt.Errorf("mysql update %s but no rows affected: %s", entry.FullPath, err)
+	}
+	return nil
+}
+
+func (store *AbstractSqlStore) FindEntry(fullpath filer2.FullPath) (*filer2.Entry, error) {
+
+	dir, name := fullpath.DirAndName()
+	row := store.DB.QueryRow("SELECT meta FROM seaweedfs WHERE directory=? and name=?", dir, name)
+	var data []byte
+	if err := row.Scan(&data); err != nil {
+		return nil, fmt.Errorf("mysql read entry %s: %v", fullpath, err)
+	}
+
+	entry := &filer2.Entry{
+		FullPath: fullpath,
+	}
+	if err := entry.DecodeAttributesAndChunks(data); err != nil {
+		return entry, fmt.Errorf("mysql decode %s : %v", entry.FullPath, err)
+	}
+
+	return entry, nil
+}
+
+func (store *AbstractSqlStore) DeleteEntry(fullpath filer2.FullPath) (*filer2.Entry, error) {
+
+	entry, _ := store.FindEntry(fullpath)
+
+	dir, name := fullpath.DirAndName()
+
+	res, err := store.DB.Exec("DELETE FROM seaweedfs WHERE directory=? and name=?", dir, name)
+	if err != nil {
+		return nil, fmt.Errorf("mysql delete %s: %s", fullpath, err)
+	}
+
+	_, err = res.RowsAffected()
+	if err != nil {
+		return nil, fmt.Errorf("mysql delete %s but no rows affected: %s", fullpath, err)
+	}
+
+	return entry, nil
+}
+
+func (store *AbstractSqlStore) ListDirectoryEntries(fullpath filer2.FullPath, startFileName string, inclusive bool, limit int) (entries []*filer2.Entry, err error) {
+
+	rows, err := store.DB.Query("SELECT NAME, meta FROM seaweedfs WHERE directory=? and name>?", fullpath, startFileName)
+	if err != nil {
+		return nil, fmt.Errorf("mysql list %s : %v", fullpath, err)
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var name string
+		var data []byte
+		if err = rows.Scan(&name, &data); err != nil {
+			glog.V(0).Infof("mysql scan %s : %v", fullpath, err)
+			return nil, fmt.Errorf("mysql scan %s: %v", fullpath, err)
+		}
+
+		entry := &filer2.Entry{
+			FullPath: fullpath,
+		}
+		if err = entry.DecodeAttributesAndChunks(data); err != nil {
+			glog.V(0).Infof("mysql scan decode %s : %v", entry.FullPath, err)
+			return nil, fmt.Errorf("mysql scan decode %s : %v", entry.FullPath, err)
+		}
+
+		entries = append(entries, entry)
+	}
+
+	return entries, nil
+}