seaweedfs/weed/filer/cassandra/cassandra_store_kv.go

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package cassandra
import (
"context"
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"fmt"
"github.com/chrislusf/seaweedfs/weed/filer"
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"github.com/gocql/gocql"
)
func (store *CassandraStore) KvPut(ctx context.Context, key []byte, value []byte) (err error) {
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dir, name := genDirAndName(key)
if err := store.session.Query(
"INSERT INTO filemeta (directory,name,meta) VALUES(?,?,?) USING TTL ? ",
dir, name, value, 0).Exec(); err != nil {
return fmt.Errorf("kv insert: %s", err)
}
return nil
}
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func (store *CassandraStore) KvGet(ctx context.Context, key []byte) (data []byte, err error) {
dir, name := genDirAndName(key)
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.ErrKvNotFound
}
}
if len(data) == 0 {
return nil, filer.ErrKvNotFound
}
return data, nil
}
func (store *CassandraStore) KvDelete(ctx context.Context, key []byte) (err error) {
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dir, name := genDirAndName(key)
if err := store.session.Query(
"DELETE FROM filemeta WHERE directory=? AND name=?",
dir, name).Exec(); err != nil {
return fmt.Errorf("kv delete: %v", err)
}
return nil
}
func genDirAndName(key []byte) (dir string, name string) {
for len(key) < 8 {
key = append(key, 0)
}
dir = string(key[:8])
name = string(key[8:])
return
}