Exemplo n.º 1
0
func VarFromData(data []byte, exe *dispatcher.Executor, db *db.Databases, 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, db, 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 := db.ReadonlyTransaction(func(rtxn *mdbs.RTxn) interface{} {
		return db.ReadTxnBytesFromDisk(rtxn, writeTxnId)
	}).ResultError(); err == nil && result != nil {
		bites := result.([]byte)
		if seg, _, err := capn.ReadFromMemoryZeroCopy(bites); err == nil {
			txn := msgs.ReadRootTxn(seg)
			actions := txn.Actions()
			v.curFrame = NewFrame(nil, v, writeTxnId, &actions, writeTxnClock, writesClock)
			v.curFrameOnDisk = v.curFrame
			v.varCap = &varCap
			return v, nil
		} else {
			return nil, err
		}
	} else {
		return nil, err
	}
}
Exemplo n.º 2
0
func (pd *ProposerDispatcher) loadFromDisk(db *db.Databases) {
	res, err := db.ReadonlyTransaction(func(rtxn *mdbs.RTxn) interface{} {
		res, _ := rtxn.WithCursor(db.Proposers, func(cursor *mdbs.Cursor) interface{} {
			// cursor.Get returns a copy of the data. So it's fine for us
			// to store and process this later - it's not about to be
			// overwritten on disk.
			proposerStates := make(map[*common.TxnId][]byte)
			txnIdData, proposerState, err := cursor.Get(nil, nil, mdb.FIRST)
			for ; err == nil; txnIdData, proposerState, err = cursor.Get(nil, nil, mdb.NEXT) {
				txnId := common.MakeTxnId(txnIdData)
				proposerStates[txnId] = proposerState
			}
			if err == mdb.NotFound {
				// fine, we just fell off the end as expected.
				return proposerStates
			} else {
				cursor.Error(err)
				return nil
			}
		})
		return res
	}).ResultError()
	if err != nil {
		panic(fmt.Sprintf("ProposerDispatcher error loading from disk: %v", err))
	} else if res != nil {
		proposerStates := res.(map[*common.TxnId][]byte)
		for txnId, proposerState := range proposerStates {
			proposerStateCopy := proposerState
			txnIdCopy := txnId
			pd.withProposerManager(txnIdCopy, func(pm *ProposerManager) {
				if err := pm.loadFromData(txnIdCopy, proposerStateCopy); err != nil {
					log.Printf("ProposerDispatcher error loading %v from disk: %v\n", txnIdCopy, err)
				}
			})
		}
		log.Printf("Loaded %v proposers from disk\n", len(proposerStates))
	}
}