Golang raft.SnapshotSink類代碼示例

func (s *nomadSnapshot) persistIndexes(sink raft.SnapshotSink,
	encoder *codec.Encoder) error {
	// Get all the indexes
	iter, err := s.snap.Indexes()
	if err != nil {
		return err
	}

	for {
		// Get the next item
		raw := iter.Next()
		if raw == nil {
			break
		}

		// Prepare the request struct
		idx := raw.(*state.IndexEntry)

		// Write out a node registration
		sink.Write([]byte{byte(IndexSnapshot)})
		if err := encoder.Encode(idx); err != nil {
			return err
		}
	}
	return nil
}

func (s *nomadSnapshot) persistEvals(sink raft.SnapshotSink,
	encoder *codec.Encoder) error {
	// Get all the evaluations
	evals, err := s.snap.Evals()
	if err != nil {
		return err
	}

	for {
		// Get the next item
		raw := evals.Next()
		if raw == nil {
			break
		}

		// Prepare the request struct
		eval := raw.(*structs.Evaluation)

		// Write out the evaluation
		sink.Write([]byte{byte(EvalSnapshot)})
		if err := encoder.Encode(eval); err != nil {
			return err
		}
	}
	return nil
}

func (s *nomadSnapshot) persistJobs(sink raft.SnapshotSink,
	encoder *codec.Encoder) error {
	// Get all the jobs
	jobs, err := s.snap.Jobs()
	if err != nil {
		return err
	}

	for {
		// Get the next item
		raw := jobs.Next()
		if raw == nil {
			break
		}

		// Prepare the request struct
		job := raw.(*structs.Job)

		// Write out a job registration
		sink.Write([]byte{byte(JobSnapshot)})
		if err := encoder.Encode(job); err != nil {
			return err
		}
	}
	return nil
}

func (s *consulSnapshot) persistTombstones(sink raft.SnapshotSink,
	encoder *codec.Encoder) error {
	stones, err := s.state.Tombstones()
	if err != nil {
		return err
	}

	for stone := stones.Next(); stone != nil; stone = stones.Next() {
		sink.Write([]byte{byte(structs.TombstoneRequestType)})

		// For historical reasons, these are serialized in the snapshots
		// as KV entries. We want to keep the snapshot format compatible
		// with pre-0.6 versions for now.
		s := stone.(*state.Tombstone)
		fake := &structs.DirEntry{
			Key: s.Key,
			RaftIndex: structs.RaftIndex{
				ModifyIndex: s.Index,
			},
		}
		if err := encoder.Encode(fake); err != nil {
			return err
		}
	}
	return nil
}

func (s *nomadSnapshot) persistPeriodicLaunches(sink raft.SnapshotSink,
	encoder *codec.Encoder) error {
	// Get all the jobs
	launches, err := s.snap.PeriodicLaunches()
	if err != nil {
		return err
	}

	for {
		// Get the next item
		raw := launches.Next()
		if raw == nil {
			break
		}

		// Prepare the request struct
		launch := raw.(*structs.PeriodicLaunch)

		// Write out a job registration
		sink.Write([]byte{byte(PeriodicLaunchSnapshot)})
		if err := encoder.Encode(launch); err != nil {
			return err
		}
	}
	return nil
}

func (s *consulSnapshot) Persist(sink raft.SnapshotSink) error {
	// Register the nodes
	encoder := codec.NewEncoder(sink, msgpackHandle)

	// Write the header
	header := snapshotHeader{
		LastIndex: s.state.LastIndex(),
	}
	if err := encoder.Encode(&header); err != nil {
		sink.Cancel()
		return err
	}

	if err := s.persistNodes(sink, encoder); err != nil {
		sink.Cancel()
		return err
	}

	if err := s.persistSessions(sink, encoder); err != nil {
		sink.Cancel()
		return err
	}

	if err := s.persistACLs(sink, encoder); err != nil {
		sink.Cancel()
		return err
	}

	if err := s.persistKV(sink, encoder); err != nil {
		sink.Cancel()
		return err
	}
	return nil
}

func (s *consulSnapshot) persistKV(sink raft.SnapshotSink,
	encoder *codec.Encoder) error {
	streamCh := make(chan interface{}, 256)
	errorCh := make(chan error)
	go func() {
		if err := s.state.KVSDump(streamCh); err != nil {
			errorCh <- err
		}
	}()

	for {
		select {
		case raw := <-streamCh:
			if raw == nil {
				return nil
			}
			sink.Write([]byte{byte(structs.KVSRequestType)})
			if err := encoder.Encode(raw); err != nil {
				return err
			}

		case err := <-errorCh:
			return err
		}
	}
	return nil
}

func (s *nomadSnapshot) persistNodes(sink raft.SnapshotSink,
	encoder *codec.Encoder) error {
	// Get all the nodes
	nodes, err := s.snap.Nodes()
	if err != nil {
		return err
	}

	for {
		// Get the next item
		raw := nodes.Next()
		if raw == nil {
			break
		}

		// Prepare the request struct
		node := raw.(*structs.Node)

		// Write out a node registration
		sink.Write([]byte{byte(NodeSnapshot)})
		if err := encoder.Encode(node); err != nil {
			return err
		}
	}
	return nil
}

func (s *nomadSnapshot) persistAllocs(sink raft.SnapshotSink,
	encoder *codec.Encoder) error {
	// Get all the allocations
	allocs, err := s.snap.Allocs()
	if err != nil {
		return err
	}

	for {
		// Get the next item
		raw := allocs.Next()
		if raw == nil {
			break
		}

		// Prepare the request struct
		alloc := raw.(*structs.Allocation)

		// Write out the evaluation
		sink.Write([]byte{byte(AllocSnapshot)})
		if err := encoder.Encode(alloc); err != nil {
			return err
		}
	}
	return nil
}

func (snap *masterSnapshot) Persist(sink raft.SnapshotSink) error {
	data, _ := json.Marshal(snap.data)
	_, err := sink.Write(data)
	if err != nil {
		sink.Cancel()
	}
	return err
}

// See raft.SnapshotSink.
func (m *MockSnapshot) Persist(sink raft.SnapshotSink) error {
	hd := codec.MsgpackHandle{}
	enc := codec.NewEncoder(sink, &hd)
	if err := enc.Encode(m.logs[:m.maxIndex]); err != nil {
		sink.Cancel()
		return err
	}
	sink.Close()
	return nil
}

func (fsm *fsm) Persist(sink raft.SnapshotSink) error {
	fsm.Lock()
	defer fsm.Unlock()

	data, _ := json.Marshal(fsm)
	_, err := sink.Write(data)
	if err != nil {
		sink.Cancel()
	}
	return err
}

func (mfsm *MyFsm) Persist(sink raft.SnapshotSink) error {
	mfsm.mutex.Lock()
	defer mfsm.mutex.Unlock()

	var buffer bytes.Buffer
	enc := gob.NewEncoder(&buffer)
	enc.Encode(mfsm.data)
	n, err := sink.Write(buffer.Bytes())
	if err != nil {
		fmt.Printf("Error in snapshotting %s\n", err)
		return err
	}
	fmt.Printf("Snapshotted %d bytes", n)
	return nil
}

func (s *consulSnapshot) persistPreparedQueries(sink raft.SnapshotSink,
	encoder *codec.Encoder) error {
	queries, err := s.state.PreparedQueries()
	if err != nil {
		return err
	}

	for _, query := range queries {
		sink.Write([]byte{byte(structs.PreparedQueryRequestType)})
		if err := encoder.Encode(query); err != nil {
			return err
		}
	}
	return nil
}

func (s *consulSnapshot) persistKVs(sink raft.SnapshotSink,
	encoder *codec.Encoder) error {
	entries, err := s.state.KVs()
	if err != nil {
		return err
	}

	for entry := entries.Next(); entry != nil; entry = entries.Next() {
		sink.Write([]byte{byte(structs.KVSRequestType)})
		if err := encoder.Encode(entry.(*structs.DirEntry)); err != nil {
			return err
		}
	}
	return nil
}