neoneo-go/pkg/core/account_state.go

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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(s storage.Store, hash util.Uint160) (*AccountState, error) {
if account, ok := a[hash]; ok {
return account, nil
}
account, err := getAccountStateFromStore(s, 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
}
// putAccountStateIntoStore puts given AccountState into the given store.
func putAccountStateIntoStore(store storage.Store, as *AccountState) error {
buf := io.NewBufBinWriter()
as.EncodeBinary(buf.BinWriter)
if buf.Err != nil {
return buf.Err
}
key := storage.AppendPrefix(storage.STAccount, as.ScriptHash.Bytes())
return store.Put(key, buf.Bytes())
}
// commit writes all account states to the given Batch.
func (a Accounts) commit(store storage.Store) error {
for _, state := range a {
if err := putAccountStateIntoStore(store, state); err != nil {
return err
}
}
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)
br.ReadArray(&s.Votes)
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.WriteArray(s.Votes)
balances := s.nonZeroBalances()
bw.WriteVarUint(uint64(len(balances)))
for k, v := range balances {
bw.WriteLE(k)
bw.WriteLE(v)
}
}
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// nonZeroBalances 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
}