package core import ( "fmt" "github.com/CityOfZion/neo-go/pkg/core/storage" "github.com/CityOfZion/neo-go/pkg/crypto/keys" "github.com/CityOfZion/neo-go/pkg/io" "github.com/CityOfZion/neo-go/pkg/util" ) // Accounts is mapping between a account address and AccountState. type Accounts map[util.Uint160]*AccountState // getAndUpdate retrieves AccountState from temporary or persistent Store // or creates a new one if it doesn't exist. func (a Accounts) getAndUpdate(ts storage.Store, ps storage.Store, hash util.Uint160) (*AccountState, error) { if account, ok := a[hash]; ok { return account, nil } account, err := getAccountStateFromStore(ts, hash) if err != nil { if err != storage.ErrKeyNotFound { return nil, err } account, err = getAccountStateFromStore(ps, hash) if err != nil { if err != storage.ErrKeyNotFound { return nil, err } account = NewAccountState(hash) } } a[hash] = account return account, nil } // getAccountStateFromStore returns AccountState from the given Store if it's // present there. Returns nil otherwise. func getAccountStateFromStore(s storage.Store, hash util.Uint160) (*AccountState, error) { var account *AccountState key := storage.AppendPrefix(storage.STAccount, hash.Bytes()) b, err := s.Get(key) if err == nil { account = new(AccountState) r := io.NewBinReaderFromBuf(b) account.DecodeBinary(r) if r.Err != nil { return nil, fmt.Errorf("failed to decode (AccountState): %s", r.Err) } } return account, err } // commit writes all account states to the given Batch. func (a Accounts) commit(b storage.Batch) error { buf := io.NewBufBinWriter() for hash, state := range a { state.EncodeBinary(buf.BinWriter) if buf.Err != nil { return buf.Err } key := storage.AppendPrefix(storage.STAccount, hash.Bytes()) b.Put(key, buf.Bytes()) buf.Reset() } return nil } // AccountState represents the state of a NEO account. type AccountState struct { Version uint8 ScriptHash util.Uint160 IsFrozen bool Votes []*keys.PublicKey Balances map[util.Uint256]util.Fixed8 } // NewAccountState returns a new AccountState object. func NewAccountState(scriptHash util.Uint160) *AccountState { return &AccountState{ Version: 0, ScriptHash: scriptHash, IsFrozen: false, Votes: []*keys.PublicKey{}, Balances: make(map[util.Uint256]util.Fixed8), } } // DecodeBinary decodes AccountState from the given BinReader. func (s *AccountState) DecodeBinary(br *io.BinReader) { br.ReadLE(&s.Version) br.ReadLE(&s.ScriptHash) br.ReadLE(&s.IsFrozen) lenVotes := br.ReadVarUint() s.Votes = make([]*keys.PublicKey, lenVotes) for i := 0; i < int(lenVotes); i++ { s.Votes[i] = &keys.PublicKey{} s.Votes[i].DecodeBinary(br) } s.Balances = make(map[util.Uint256]util.Fixed8) lenBalances := br.ReadVarUint() for i := 0; i < int(lenBalances); i++ { key := util.Uint256{} br.ReadLE(&key) var val util.Fixed8 br.ReadLE(&val) s.Balances[key] = val } } // EncodeBinary encodes AccountState to the given BinWriter. func (s *AccountState) EncodeBinary(bw *io.BinWriter) { bw.WriteLE(s.Version) bw.WriteLE(s.ScriptHash) bw.WriteLE(s.IsFrozen) bw.WriteVarUint(uint64(len(s.Votes))) for _, point := range s.Votes { point.EncodeBinary(bw) } balances := s.nonZeroBalances() bw.WriteVarUint(uint64(len(balances))) for k, v := range balances { bw.WriteLE(k) bw.WriteLE(v) } } // Returns only the non-zero balances for the account. func (s *AccountState) nonZeroBalances() map[util.Uint256]util.Fixed8 { b := make(map[util.Uint256]util.Fixed8) for k, v := range s.Balances { if v > 0 { b[k] = v } } return b }