neoneo-go/pkg/core/account_state.go

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package core
import (
"bytes"
"encoding/binary"
"fmt"
"io"
"github.com/CityOfZion/neo-go/pkg/core/storage"
"github.com/CityOfZion/neo-go/pkg/crypto"
"github.com/CityOfZion/neo-go/pkg/util"
)
// Accounts is mapping between a account address and AccountState.
type Accounts map[util.Uint160]*AccountState
func (a Accounts) getAndUpdate(s storage.Store, hash util.Uint160) (*AccountState, error) {
if account, ok := a[hash]; ok {
return account, nil
}
account := &AccountState{}
key := storage.AppendPrefix(storage.STAccount, hash.Bytes())
if b, err := s.Get(key); err == nil {
if err := account.DecodeBinary(bytes.NewReader(b)); err != nil {
return nil, fmt.Errorf("failed to decode (AccountState): %s", err)
}
} else {
account = NewAccountState(hash)
}
a[hash] = account
return account, nil
}
// commit writes all account states to the given Batch.
func (a Accounts) commit(b storage.Batch) error {
buf := new(bytes.Buffer)
for hash, state := range a {
if err := state.EncodeBinary(buf); err != nil {
return 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 []*crypto.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: []*crypto.PublicKey{},
Balances: make(map[util.Uint256]util.Fixed8),
}
}
// DecodeBinary decodes AccountState from the given io.Reader.
func (s *AccountState) DecodeBinary(r io.Reader) error {
if err := binary.Read(r, binary.LittleEndian, &s.Version); err != nil {
return err
}
if err := binary.Read(r, binary.LittleEndian, &s.ScriptHash); err != nil {
return err
}
if err := binary.Read(r, binary.LittleEndian, &s.IsFrozen); err != nil {
return err
}
lenVotes := util.ReadVarUint(r)
s.Votes = make([]*crypto.PublicKey, lenVotes)
for i := 0; i < int(lenVotes); i++ {
s.Votes[i] = &crypto.PublicKey{}
if err := s.Votes[i].DecodeBinary(r); err != nil {
return err
}
}
s.Balances = make(map[util.Uint256]util.Fixed8)
lenBalances := util.ReadVarUint(r)
for i := 0; i < int(lenBalances); i++ {
key := util.Uint256{}
if err := binary.Read(r, binary.LittleEndian, &key); err != nil {
return err
}
var val util.Fixed8
if err := binary.Read(r, binary.LittleEndian, &val); err != nil {
return err
}
s.Balances[key] = val
}
return nil
}
// EncodeBinary encode AccountState to the given io.Writer.
func (s *AccountState) EncodeBinary(w io.Writer) error {
if err := binary.Write(w, binary.LittleEndian, s.Version); err != nil {
return err
}
if err := binary.Write(w, binary.LittleEndian, s.ScriptHash); err != nil {
return err
}
if err := binary.Write(w, binary.LittleEndian, s.IsFrozen); err != nil {
return err
}
if err := util.WriteVarUint(w, uint64(len(s.Votes))); err != nil {
return err
}
for _, point := range s.Votes {
if err := point.EncodeBinary(w); err != nil {
return err
}
}
balances := s.nonZeroBalances()
if err := util.WriteVarUint(w, uint64(len(balances))); err != nil {
return err
}
for k, v := range balances {
if err := binary.Write(w, binary.LittleEndian, k); err != nil {
return err
}
if err := binary.Write(w, binary.LittleEndian, v); err != nil {
return err
}
}
return nil
}
// 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
}