1 files changed, 163 insertions, 0 deletions
diff --git a/weed/filer/cassandra/cassandra_store.go b/weed/filer/cassandra/cassandra_store.go
new file mode 100644
index 000000000..fd161b1f1
--- /dev/null
+++ b/weed/filer/cassandra/cassandra_store.go
@@ -0,0 +1,163 @@
+package cassandra
+
+import (
+	"context"
+	"fmt"
+	"github.com/gocql/gocql"
+
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/util"
+)
+
+func init() {
+	filer.Stores = append(filer.Stores, &CassandraStore{})
+}
+
+type CassandraStore struct {
+	cluster *gocql.ClusterConfig
+	session *gocql.Session
+}
+
+func (store *CassandraStore) GetName() string {
+	return "cassandra"
+}
+
+func (store *CassandraStore) Initialize(configuration util.Configuration, prefix string) (err error) {
+	return store.initialize(
+		configuration.GetString(prefix+"keyspace"),
+		configuration.GetStringSlice(prefix+"hosts"),
+	)
+}
+
+func (store *CassandraStore) initialize(keyspace string, hosts []string) (err error) {
+	store.cluster = gocql.NewCluster(hosts...)
+	store.cluster.Keyspace = keyspace
+	store.cluster.Consistency = gocql.LocalQuorum
+	store.session, err = store.cluster.CreateSession()
+	if err != nil {
+		glog.V(0).Infof("Failed to open cassandra store, hosts %v, keyspace %s", hosts, keyspace)
+	}
+	return
+}
+
+func (store *CassandraStore) BeginTransaction(ctx context.Context) (context.Context, error) {
+	return ctx, nil
+}
+func (store *CassandraStore) CommitTransaction(ctx context.Context) error {
+	return nil
+}
+func (store *CassandraStore) RollbackTransaction(ctx context.Context) error {
+	return nil
+}
+
+func (store *CassandraStore) InsertEntry(ctx context.Context, entry *filer.Entry) (err error) {
+
+	dir, name := entry.FullPath.DirAndName()
+	meta, err := entry.EncodeAttributesAndChunks()
+	if err != nil {
+		return fmt.Errorf("encode %s: %s", entry.FullPath, err)
+	}
+
+	if err := store.session.Query(
+		"INSERT INTO filemeta (directory,name,meta) VALUES(?,?,?) USING TTL ? ",
+		dir, name, meta, entry.TtlSec).Exec(); err != nil {
+		return fmt.Errorf("insert %s: %s", entry.FullPath, err)
+	}
+
+	return nil
+}
+
+func (store *CassandraStore) UpdateEntry(ctx context.Context, entry *filer.Entry) (err error) {
+
+	return store.InsertEntry(ctx, entry)
+}
+
+func (store *CassandraStore) FindEntry(ctx context.Context, fullpath util.FullPath) (entry *filer.Entry, err error) {
+
+	dir, name := fullpath.DirAndName()
+	var data []byte
+	if err := store.session.Query(
+		"SELECT meta FROM filemeta WHERE directory=? AND name=?",
+		dir, name).Consistency(gocql.One).Scan(&data); err != nil {
+		if err != gocql.ErrNotFound {
+			return nil, filer_pb.ErrNotFound
+		}
+	}
+
+	if len(data) == 0 {
+		return nil, filer_pb.ErrNotFound
+	}
+
+	entry = &filer.Entry{
+		FullPath: fullpath,
+	}
+	err = entry.DecodeAttributesAndChunks(data)
+	if err != nil {
+		return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
+	}
+
+	return entry, nil
+}
+
+func (store *CassandraStore) DeleteEntry(ctx context.Context, fullpath util.FullPath) error {
+
+	dir, name := fullpath.DirAndName()
+
+	if err := store.session.Query(
+		"DELETE FROM filemeta WHERE directory=? AND name=?",
+		dir, name).Exec(); err != nil {
+		return fmt.Errorf("delete %s : %v", fullpath, err)
+	}
+
+	return nil
+}
+
+func (store *CassandraStore) DeleteFolderChildren(ctx context.Context, fullpath util.FullPath) error {
+
+	if err := store.session.Query(
+		"DELETE FROM filemeta WHERE directory=?",
+		fullpath).Exec(); err != nil {
+		return fmt.Errorf("delete %s : %v", fullpath, err)
+	}
+
+	return nil
+}
+
+func (store *CassandraStore) ListDirectoryPrefixedEntries(ctx context.Context, fullpath util.FullPath, startFileName string, inclusive bool, limit int, prefix string) (entries []*filer.Entry, err error) {
+	return nil, filer.ErrUnsupportedListDirectoryPrefixed
+}
+
+func (store *CassandraStore) ListDirectoryEntries(ctx context.Context, fullpath util.FullPath, startFileName string, inclusive bool,
+	limit int) (entries []*filer.Entry, err error) {
+
+	cqlStr := "SELECT NAME, meta FROM filemeta WHERE directory=? AND name>? ORDER BY NAME ASC LIMIT ?"
+	if inclusive {
+		cqlStr = "SELECT NAME, meta FROM filemeta WHERE directory=? AND name>=? ORDER BY NAME ASC LIMIT ?"
+	}
+
+	var data []byte
+	var name string
+	iter := store.session.Query(cqlStr, string(fullpath), startFileName, limit).Iter()
+	for iter.Scan(&name, &data) {
+		entry := &filer.Entry{
+			FullPath: util.NewFullPath(string(fullpath), name),
+		}
+		if decodeErr := entry.DecodeAttributesAndChunks(data); decodeErr != nil {
+			err = decodeErr
+			glog.V(0).Infof("list %s : %v", entry.FullPath, err)
+			break
+		}
+		entries = append(entries, entry)
+	}
+	if err := iter.Close(); err != nil {
+		glog.V(0).Infof("list iterator close: %v", err)
+	}
+
+	return entries, err
+}
+
+func (store *CassandraStore) Shutdown() {
+	store.session.Close()
+}