92 lines
2.5 KiB
Go
92 lines
2.5 KiB
Go
package shared
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import (
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"context"
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"encoding/gob"
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"fusenapi/initalize"
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"io"
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"sync"
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sm "github.com/lni/dragonboat/v4/statemachine"
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"gorm.io/gorm"
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)
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// FsStateMachine is a simple key-value store as an FSM.
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type FsStateMachine struct {
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shardID uint64
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replicaID uint64
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mu sync.Mutex
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store map[int64]*UserState
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gdb *gorm.DB
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// waiter *WaitCallback
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// ra *raft.Raft // The consensus mechanism
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}
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func NewFsStateMachine(shardID uint64, replicaID uint64) sm.IStateMachine {
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return &FsStateMachine{
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shardID: shardID,
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replicaID: replicaID,
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store: make(map[int64]*UserState),
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gdb: initalize.InitMysql("fusentest:XErSYmLELKMnf3Dh@tcp(110.41.19.98:3306)/fusentest"),
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}
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}
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// Lookup performs local lookup on the ExampleStateMachine instance. In this example,
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// we always return the Count value as a little endian binary encoded byte
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// slice.
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func (s *FsStateMachine) Lookup(query interface{}) (item interface{}, err error) {
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s.mu.Lock()
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defer s.mu.Unlock()
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userid := query.(int64)
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if us, ok := s.store[userid]; ok {
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return us, nil
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}
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return nil, nil
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}
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// Update updates the object using the specified committed raft entry.
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func (s *FsStateMachine) Update(e sm.Entry) (result sm.Result, err error) {
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ctx := context.TODO()
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ctx = context.WithValue(ctx, ctxEntry{}, &e)
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ctx = context.WithValue(ctx, ctxSM{}, s)
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return FsPasser.ExecuteWithBytes(ctx, e.Cmd)
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}
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// SaveSnapshot saves the current IStateMachine state into a snapshot using the
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// specified io.Writer object.
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func (s *FsStateMachine) SaveSnapshot(w io.Writer,
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fc sm.ISnapshotFileCollection, done <-chan struct{}) error {
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// as shown above, the only state that can be saved is the Count variable
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// there is no external file in this IStateMachine example, we thus leave
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// the fc untouched
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s.mu.Lock()
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defer s.mu.Unlock()
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return gob.NewEncoder(w).Encode(&s.store)
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}
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// RecoverFromSnapshot recovers the state using the provided snapshot.
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func (s *FsStateMachine) RecoverFromSnapshot(r io.Reader,
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files []sm.SnapshotFile,
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done <-chan struct{}) error {
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// restore the Count variable, that is the only state we maintain in this
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// example, the input files is expected to be empty
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err := gob.NewDecoder(r).Decode(&s.store)
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if err != nil {
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return err
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}
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return nil
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}
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// Close closes the IStateMachine instance. There is nothing for us to cleanup
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// or release as this is a pure in memory data store. Note that the Close
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// method is not guaranteed to be called as node can crash at any time.
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func (s *FsStateMachine) Close() error { return nil }
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