neo-go/pkg/core/state/account.go
2020-06-05 19:20:16 +03:00

108 lines
2.9 KiB
Go

package state
import (
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/util"
)
// UnspentBalance contains input/output transactons that sum up into the
// account balance for the given asset.
type UnspentBalance struct {
Tx util.Uint256 `json:"txid"`
Index uint16 `json:"n"`
Value util.Fixed8 `json:"value"`
}
// UnspentBalances is a slice of UnspentBalance (mostly needed to sort them).
type UnspentBalances []UnspentBalance
// Account represents the state of a NEO account.
type Account struct {
Version uint8
ScriptHash util.Uint160
IsFrozen bool
Balances map[util.Uint256][]UnspentBalance
}
// NewAccount returns a new Account object.
func NewAccount(scriptHash util.Uint160) *Account {
return &Account{
Version: 0,
ScriptHash: scriptHash,
IsFrozen: false,
Balances: make(map[util.Uint256][]UnspentBalance),
}
}
// DecodeBinary decodes Account from the given BinReader.
func (s *Account) DecodeBinary(br *io.BinReader) {
s.Version = uint8(br.ReadB())
s.ScriptHash.DecodeBinary(br)
s.IsFrozen = br.ReadBool()
s.Balances = make(map[util.Uint256][]UnspentBalance)
lenBalances := br.ReadVarUint()
for i := 0; i < int(lenBalances); i++ {
key := util.Uint256{}
br.ReadBytes(key[:])
len := int(br.ReadVarUint())
ubs := make([]UnspentBalance, len)
for j := 0; j < len; j++ {
ubs[j].DecodeBinary(br)
}
s.Balances[key] = ubs
}
}
// EncodeBinary encodes Account to the given BinWriter.
func (s *Account) EncodeBinary(bw *io.BinWriter) {
bw.WriteB(byte(s.Version))
s.ScriptHash.EncodeBinary(bw)
bw.WriteBool(s.IsFrozen)
bw.WriteVarUint(uint64(len(s.Balances)))
for k, v := range s.Balances {
bw.WriteBytes(k[:])
bw.WriteVarUint(uint64(len(v)))
for i := range v {
v[i].EncodeBinary(bw)
}
}
}
// DecodeBinary implements io.Serializable interface.
func (u *UnspentBalance) DecodeBinary(r *io.BinReader) {
u.Tx.DecodeBinary(r)
u.Index = r.ReadU16LE()
u.Value.DecodeBinary(r)
}
// EncodeBinary implements io.Serializable interface.
func (u *UnspentBalance) EncodeBinary(w *io.BinWriter) {
u.Tx.EncodeBinary(w)
w.WriteU16LE(u.Index)
u.Value.EncodeBinary(w)
}
// GetBalanceValues sums all unspent outputs and returns a map of asset IDs to
// overall balances.
func (s *Account) GetBalanceValues() map[util.Uint256]util.Fixed8 {
res := make(map[util.Uint256]util.Fixed8)
for k, v := range s.Balances {
balance := util.Fixed8(0)
for _, b := range v {
balance += b.Value
}
res[k] = balance
}
return res
}
// Len returns the length of UnspentBalances (used to sort things).
func (us UnspentBalances) Len() int { return len(us) }
// Less compares two elements of UnspentBalances (used to sort things).
func (us UnspentBalances) Less(i, j int) bool { return us[i].Value < us[j].Value }
// Swap swaps two elements of UnspentBalances (used to sort things).
func (us UnspentBalances) Swap(i, j int) { us[i], us[j] = us[j], us[i] }