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package raft
import (
"fmt"
"io"
)
// DiscardSnapshotStore is used to successfully snapshot while
// always discarding the snapshot. This is useful for when the
// log should be truncated but no snapshot should be retained.
// This should never be used for production use, and is only
// suitable for testing.
type DiscardSnapshotStore struct{}
type DiscardSnapshotSink struct{}
// NewDiscardSnapshotStore is used to create a new DiscardSnapshotStore.
func NewDiscardSnapshotStore() *DiscardSnapshotStore {
return &DiscardSnapshotStore{}
}
func (d *DiscardSnapshotStore) Create(version SnapshotVersion, index, term uint64,
configuration Configuration, configurationIndex uint64, trans Transport) (SnapshotSink, error) {
return &DiscardSnapshotSink{}, nil
}
func (d *DiscardSnapshotStore) List() ([]*SnapshotMeta, error) {
return nil, nil
}
func (d *DiscardSnapshotStore) Open(id string) (*SnapshotMeta, io.ReadCloser, error) {
return nil, nil, fmt.Errorf("open is not supported")
}
func (d *DiscardSnapshotSink) Write(b []byte) (int, error) {
return len(b), nil
}
func (d *DiscardSnapshotSink) Close() error {
return nil
}
func (d *DiscardSnapshotSink) ID() string {
return "discard"
}
func (d *DiscardSnapshotSink) Cancel() error {
return nil
}
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