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
}
}
