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 superLargeDirectoryHash map[string]string } 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"), configuration.GetString(prefix+"username"), configuration.GetString(prefix+"password"), configuration.GetStringSlice(prefix+"superLargeDirectories"), configuration.GetString(prefix+"localDC"), ) } func (store *CassandraStore) isSuperLargeDirectory(dir string) (dirHash string, isSuperLargeDirectory bool) { dirHash, isSuperLargeDirectory = store.superLargeDirectoryHash[dir] return } func (store *CassandraStore) initialize(keyspace string, hosts []string, username string, password string, superLargeDirectories []string, localDC string) (err error) { store.cluster = gocql.NewCluster(hosts...) if username != "" && password != "" { store.cluster.Authenticator = gocql.PasswordAuthenticator{Username: username, Password: password} } store.cluster.Keyspace = keyspace fallback := gocql.RoundRobinHostPolicy() if localDC != "" { fallback = gocql.DCAwareRoundRobinPolicy(localDC) } store.cluster.PoolConfig.HostSelectionPolicy = gocql.TokenAwareHostPolicy(fallback) 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) } // set directory hash store.superLargeDirectoryHash = make(map[string]string) existingHash := make(map[string]string) for _, dir := range superLargeDirectories { // adding dir hash to avoid duplicated names dirHash := util.Md5String([]byte(dir))[:4] store.superLargeDirectoryHash[dir] = dirHash if existingDir, found := existingHash[dirHash]; found { glog.Fatalf("directory %s has the same hash as %s", dir, existingDir) } existingHash[dirHash] = dir } 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() if dirHash, ok := store.isSuperLargeDirectory(dir); ok { dir, name = dirHash+name, "" } meta, err := entry.EncodeAttributesAndChunks() if err != nil { return fmt.Errorf("encode %s: %s", entry.FullPath, err) } if len(entry.Chunks) > 50 { meta = util.MaybeGzipData(meta) } 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() if dirHash, ok := store.isSuperLargeDirectory(dir); ok { dir, name = dirHash+name, "" } var data []byte if err := store.session.Query( "SELECT meta FROM filemeta WHERE directory=? AND name=?", dir, name).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(util.MaybeDecompressData(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 dirHash, ok := store.isSuperLargeDirectory(dir); ok { dir, name = dirHash+name, "" } 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 _, ok := store.isSuperLargeDirectory(string(fullpath)); ok { return nil // filer.ErrUnsupportedSuperLargeDirectoryListing } 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, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, prefix string, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) { return lastFileName, filer.ErrUnsupportedListDirectoryPrefixed } func (store *CassandraStore) ListDirectoryEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) { if _, ok := store.isSuperLargeDirectory(string(dirPath)); ok { return // nil, filer.ErrUnsupportedSuperLargeDirectoryListing } cqlStr := "SELECT NAME, meta FROM filemeta WHERE directory=? AND name>? ORDER BY NAME ASC LIMIT ?" if includeStartFile { 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(dirPath), startFileName, limit+1).Iter() for iter.Scan(&name, &data) { entry := &filer.Entry{ FullPath: util.NewFullPath(string(dirPath), name), } lastFileName = name if decodeErr := entry.DecodeAttributesAndChunks(util.MaybeDecompressData(data)); decodeErr != nil { err = decodeErr glog.V(0).Infof("list %s : %v", entry.FullPath, err) break } if !eachEntryFunc(entry) { break } } if err := iter.Close(); err != nil { glog.V(0).Infof("list iterator close: %v", err) } return lastFileName, err } func (store *CassandraStore) Shutdown() { store.session.Close() }