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fsm.go
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fsm.go
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// Copyright 2019-present Open Networking Foundation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package storage
import (
"encoding/binary"
"github.com/atomix/atomix-go-framework/pkg/atomix/cluster"
protocol "github.com/atomix/atomix-go-framework/pkg/atomix/storage/protocol/rsm"
"github.com/atomix/atomix-go-framework/pkg/atomix/stream"
"github.com/gogo/protobuf/proto"
"github.com/lni/dragonboat/v3/statemachine"
"io"
"sync"
"time"
)
// newStateMachine returns a new primitive state machine
func newStateMachine(cluster cluster.Cluster, partitionID protocol.PartitionID, registry *protocol.Registry, streams *streamManager) *StateMachine {
fsm := &StateMachine{
partition: partitionID,
streams: streams,
}
fsm.state = protocol.NewManager(cluster, registry, fsm)
return fsm
}
// StateMachine is a Raft state machine
type StateMachine struct {
partition protocol.PartitionID
state *protocol.Manager
streams *streamManager
index protocol.Index
timestamp time.Time
mu sync.Mutex
}
// PartitionID returns the partition ID for the state machine
func (s *StateMachine) PartitionID() protocol.PartitionID {
return s.partition
}
// Index returns the current state machine index
func (s *StateMachine) Index() protocol.Index {
return s.index
}
// Timestamp returns the current state machine time
func (s *StateMachine) Timestamp() time.Time {
return s.timestamp
}
// Update updates the state machine state
func (s *StateMachine) Update(bytes []byte) (statemachine.Result, error) {
s.mu.Lock()
defer s.mu.Unlock()
tsEntry := &Entry{}
if err := proto.Unmarshal(bytes, tsEntry); err != nil {
return statemachine.Result{}, err
}
stream := s.streams.getStream(tsEntry.StreamID)
s.index++
if tsEntry.Timestamp.After(s.timestamp) {
s.timestamp = tsEntry.Timestamp
}
s.state.Command(tsEntry.Value, stream)
return statemachine.Result{}, nil
}
// Lookup queries the state machine state
func (s *StateMachine) Lookup(value interface{}) (interface{}, error) {
s.mu.Lock()
defer s.mu.Unlock()
query := value.(queryContext)
s.state.Query(query.value, query.stream)
return nil, nil
}
// SaveSnapshot saves a snapshot of the state machine state
func (s *StateMachine) SaveSnapshot(writer io.Writer, files statemachine.ISnapshotFileCollection, done <-chan struct{}) error {
s.mu.Lock()
defer s.mu.Unlock()
bytes := make([]byte, 8)
binary.BigEndian.PutUint64(bytes, uint64(s.index))
if _, err := writer.Write(bytes); err != nil {
return err
}
binary.BigEndian.PutUint64(bytes, uint64(s.timestamp.Second()))
if _, err := writer.Write(bytes); err != nil {
return err
}
binary.BigEndian.PutUint64(bytes, uint64(s.timestamp.Nanosecond()))
if _, err := writer.Write(bytes); err != nil {
return err
}
return s.state.Snapshot(writer)
}
// RecoverFromSnapshot recovers the state machine state from a snapshot
func (s *StateMachine) RecoverFromSnapshot(reader io.Reader, files []statemachine.SnapshotFile, done <-chan struct{}) error {
s.mu.Lock()
defer s.mu.Unlock()
bytes := make([]byte, 8)
if _, err := reader.Read(bytes); err != nil {
return err
}
s.index = protocol.Index(binary.BigEndian.Uint64(bytes))
if _, err := reader.Read(bytes); err != nil {
return err
}
secs := int64(binary.BigEndian.Uint64(bytes))
if _, err := reader.Read(bytes); err != nil {
return err
}
nanos := int64(binary.BigEndian.Uint64(bytes))
s.timestamp = time.Unix(secs, nanos)
return s.state.Install(reader)
}
// Close closes the state machine
func (s *StateMachine) Close() error {
return nil
}
type queryContext struct {
value []byte
stream stream.WriteStream
}