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130 lines
3.4 KiB
130 lines
3.4 KiB
package cassandra
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import (
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"fmt"
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"github.com/chrislusf/seaweedfs/weed/filer2"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/gocql/gocql"
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)
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func init() {
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filer2.Stores = append(filer2.Stores, &CassandraStore{})
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}
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type CassandraStore struct {
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cluster *gocql.ClusterConfig
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session *gocql.Session
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}
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func (store *CassandraStore) GetName() string {
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return "cassandra"
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}
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func (store *CassandraStore) Initialize(configuration filer2.Configuration) (err error) {
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return store.initialize(
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configuration.GetString("keyspace"),
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configuration.GetStringSlice("hosts"),
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)
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}
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func (store *CassandraStore) initialize(keyspace string, hosts []string) (err error) {
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store.cluster = gocql.NewCluster(hosts...)
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store.cluster.Keyspace = keyspace
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store.cluster.Consistency = gocql.LocalQuorum
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store.session, err = store.cluster.CreateSession()
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if err != nil {
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glog.V(0).Infof("Failed to open cassandra store, hosts %v, keyspace %s", hosts, keyspace)
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}
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return
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}
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func (store *CassandraStore) InsertEntry(entry *filer2.Entry) (err error) {
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dir, name := entry.FullPath.DirAndName()
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meta, err := entry.EncodeAttributesAndChunks()
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if err != nil {
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return fmt.Errorf("encode %s: %s", entry.FullPath, err)
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}
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if err := store.session.Query(
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"INSERT INTO filemeta (directory,name,meta) VALUES(?,?,?)",
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dir, name, meta).Exec(); err != nil {
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return fmt.Errorf("insert %s: %s", entry.FullPath, err)
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}
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return nil
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}
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func (store *CassandraStore) UpdateEntry(entry *filer2.Entry) (err error) {
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return store.InsertEntry(entry)
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}
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func (store *CassandraStore) FindEntry(fullpath filer2.FullPath) (entry *filer2.Entry, err error) {
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dir, name := fullpath.DirAndName()
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var data []byte
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if err := store.session.Query(
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"SELECT meta FROM filemeta WHERE directory=? AND name=?",
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dir, name).Consistency(gocql.One).Scan(&data); err != nil {
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if err != gocql.ErrNotFound {
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return nil, fmt.Errorf("read entry %s: %v", fullpath, err)
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}
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}
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if len(data) == 0 {
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return nil, fmt.Errorf("not found: %s", fullpath)
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}
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entry = &filer2.Entry{
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FullPath: fullpath,
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}
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err = entry.DecodeAttributesAndChunks(data)
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if err != nil {
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return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
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}
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return entry, nil
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}
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func (store *CassandraStore) DeleteEntry(fullpath filer2.FullPath) error {
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dir, name := fullpath.DirAndName()
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if err := store.session.Query(
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"DELETE FROM filemeta WHERE directory=? AND name=?",
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dir, name).Exec(); err != nil {
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return fmt.Errorf("delete %s : %v", fullpath, err)
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}
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return nil
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}
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func (store *CassandraStore) ListDirectoryEntries(fullpath filer2.FullPath, startFileName string, inclusive bool,
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limit int) (entries []*filer2.Entry, err error) {
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cqlStr := "SELECT NAME, meta FROM filemeta WHERE directory=? AND name>? ORDER BY NAME ASC LIMIT ?"
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if inclusive {
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cqlStr = "SELECT NAME, meta FROM filemeta WHERE directory=? AND name>=? ORDER BY NAME ASC LIMIT ?"
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}
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var data []byte
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var name string
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iter := store.session.Query(cqlStr, string(fullpath), startFileName, limit).Iter()
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for iter.Scan(&name, &data) {
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entry := &filer2.Entry{
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FullPath: filer2.NewFullPath(string(fullpath), name),
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}
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if decodeErr := entry.DecodeAttributesAndChunks(data); decodeErr != nil {
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err = decodeErr
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glog.V(0).Infof("list %s : %v", entry.FullPath, err)
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break
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}
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entries = append(entries, entry)
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}
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if err := iter.Close(); err != nil {
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glog.V(0).Infof("list iterator close: %v", err)
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}
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return entries, err
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}
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