Exemple #1
0
func VarFromData(data []byte, exe *dispatcher.Executor, disk *mdbs.MDBServer, vm *VarManager) (*Var, error) {
	seg, _, err := capn.ReadFromMemoryZeroCopy(data)
	if err != nil {
		return nil, err
	}
	varCap := msgs.ReadRootVar(seg)

	v := newVar(common.MakeVarUUId(varCap.Id()), exe, disk, vm)
	positions := varCap.Positions()
	if positions.Len() != 0 {
		v.positions = (*common.Positions)(&positions)
	}

	writeTxnId := common.MakeTxnId(varCap.WriteTxnId())
	writeTxnClock := VectorClockFromCap(varCap.WriteTxnClock())
	writesClock := VectorClockFromCap(varCap.WritesClock())
	server.Log(v.UUId, "Restored", writeTxnId)

	if result, err := disk.ReadonlyTransaction(func(rtxn *mdbs.RTxn) (interface{}, error) {
		return db.ReadTxnFromDisk(rtxn, writeTxnId)
	}).ResultError(); err == nil {
		if result == nil || result.(*msgs.Txn) == nil {
			panic(fmt.Sprintf("%v Unable to find txn %v on disk (%v)", v.UUId, writeTxnId, result))
		}
		actions := result.(*msgs.Txn).Actions()
		v.curFrame = NewFrame(nil, v, writeTxnId, &actions, writeTxnClock, writesClock)
		v.curFrameOnDisk = v.curFrame
	} else {
		return nil, err
	}

	v.varCap = &varCap

	return v, nil
}
Exemple #2
0
func loadVars(disk *mdbs.MDBServer, vars map[common.VarUUId]*varstate) {
	_, err := disk.ReadonlyTransaction(func(rtxn *mdbs.RTxn) (interface{}, error) {
		return rtxn.WithCursor(db.DB.Vars, func(cursor *mdb.Cursor) (interface{}, error) {
			key, data, err := cursor.Get(nil, nil, mdb.FIRST)
			for ; err == nil; key, data, err = cursor.Get(nil, nil, mdb.NEXT) {
				vUUId := common.MakeVarUUId(key)
				seg, _, err := capn.ReadFromMemoryZeroCopy(data)
				if err != nil {
					log.Println(err)
					continue
				}

				varCap := msgs.ReadRootVar(seg)
				pos := varCap.Positions()
				positions := (*common.Positions)(&pos)
				writeTxnId := common.MakeTxnId(varCap.WriteTxnId())
				writeTxnClock := eng.VectorClockFromCap(varCap.WriteTxnClock())
				writesClock := eng.VectorClockFromCap(varCap.WritesClock())

				if state, found := vars[*vUUId]; found {
					if err := state.matches(disk, writeTxnId, writeTxnClock, writesClock, positions); err != nil {
						log.Println(err)
					}
				} else {
					state = &varstate{
						vUUId:            vUUId,
						disks:            []*mdbs.MDBServer{disk},
						writeTxnId:       writeTxnId,
						writeTxnClock:    writeTxnClock,
						writeWritesClock: writesClock,
						positions:        positions,
					}
					vars[*vUUId] = state
				}
			}
			if err == mdb.NotFound {
				return nil, nil
			} else {
				return nil, err
			}
		})
	}).ResultError()
	if err != nil {
		log.Println(err)
	}
}