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52 lines
1.1 KiB
Go
52 lines
1.1 KiB
Go
package snapshot
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import (
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"expvar"
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"io"
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"log"
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"time"
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"github.com/hashicorp/raft"
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"github.com/rqlite/rqlite/v8/progress"
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)
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// Snapshot represents a snapshot of the database state.
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type Snapshot struct {
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rc io.ReadCloser
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logger *log.Logger
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}
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// NewSnapshot creates a new snapshot.
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func NewSnapshot(rc io.ReadCloser) *Snapshot {
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return &Snapshot{
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rc: rc,
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logger: log.New(log.Writer(), "[snapshot] ", log.LstdFlags),
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}
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}
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// Persist writes the snapshot to the given sink.
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func (s *Snapshot) Persist(sink raft.SnapshotSink) error {
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defer s.rc.Close()
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startT := time.Now()
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cw := progress.NewCountingWriter(sink)
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cm := progress.StartCountingMonitor(func(n int64) {
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s.logger.Printf("persisted %d bytes", n)
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}, cw)
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n, err := func() (int64, error) {
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defer cm.StopAndWait()
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return io.Copy(cw, s.rc)
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}()
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if err != nil {
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return err
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}
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dur := time.Since(startT)
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stats.Get(persistSize).(*expvar.Int).Set(n)
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stats.Get(persistDuration).(*expvar.Int).Set(dur.Milliseconds())
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return err
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}
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// Release releases the snapshot.
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func (s *Snapshot) Release() {}
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