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
}
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)
}
}