neoneo-go/pkg/core/state/nep5.go

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package state
import (
"math/big"
"github.com/nspcc-dev/neo-go/pkg/encoding/bigint"
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"github.com/nspcc-dev/neo-go/pkg/io"
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"github.com/nspcc-dev/neo-go/pkg/util"
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)
// NEP5Tracker contains info about a single account in a NEP5 contract.
type NEP5Tracker struct {
// Balance is the current balance of the account.
Balance big.Int
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// LastUpdatedBlock is a number of block when last `transfer` to or from the
// account occured.
LastUpdatedBlock uint32
}
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// NEP5TransferLog is a log of NEP5 token transfers for the specific command.
type NEP5TransferLog struct {
Raw []byte
// size is the number of NEP5Transfers written into Raw
size int
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}
// NEP5Transfer represents a single NEP5 Transfer event.
type NEP5Transfer struct {
// Asset is a NEP5 contract hash.
Asset util.Uint160
// Address is the address of the sender.
From util.Uint160
// To is the address of the receiver.
To util.Uint160
// Amount is the amount of tokens transferred.
// It is negative when tokens are sent and positive if they are received.
Amount big.Int
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// Block is a number of block when the event occured.
Block uint32
// Timestamp is the timestamp of the block where transfer occured.
Timestamp uint64
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// Tx is a hash the transaction.
Tx util.Uint256
}
// NEP5Balances is a map of the NEP5 contract hashes
// to the corresponding structures.
type NEP5Balances struct {
Trackers map[util.Uint160]NEP5Tracker
// NextTransferBatch stores an index of the next transfer batch.
NextTransferBatch uint32
}
// NewNEP5Balances returns new NEP5Balances.
func NewNEP5Balances() *NEP5Balances {
return &NEP5Balances{
Trackers: make(map[util.Uint160]NEP5Tracker),
}
}
// DecodeBinary implements io.Serializable interface.
func (bs *NEP5Balances) DecodeBinary(r *io.BinReader) {
bs.NextTransferBatch = r.ReadU32LE()
lenBalances := r.ReadVarUint()
m := make(map[util.Uint160]NEP5Tracker, lenBalances)
for i := 0; i < int(lenBalances); i++ {
var key util.Uint160
var tr NEP5Tracker
r.ReadBytes(key[:])
tr.DecodeBinary(r)
m[key] = tr
}
bs.Trackers = m
}
// EncodeBinary implements io.Serializable interface.
func (bs *NEP5Balances) EncodeBinary(w *io.BinWriter) {
w.WriteU32LE(bs.NextTransferBatch)
w.WriteVarUint(uint64(len(bs.Trackers)))
for k, v := range bs.Trackers {
w.WriteBytes(k[:])
v.EncodeBinary(w)
}
}
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// Append appends single transfer to a log.
func (lg *NEP5TransferLog) Append(tr *NEP5Transfer) error {
w := io.NewBufBinWriter()
tr.EncodeBinary(w.BinWriter)
if w.Err != nil {
return w.Err
}
lg.Raw = append(lg.Raw, w.Bytes()...)
lg.size++
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return nil
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}
// ForEach iterates over transfer log returning on first error.
func (lg *NEP5TransferLog) ForEach(f func(*NEP5Transfer) error) error {
if lg == nil {
return nil
}
tr := new(NEP5Transfer)
var bytesRead int
for i := 0; i < len(lg.Raw); i += bytesRead {
r := io.NewBinReaderFromBuf(lg.Raw[i:])
bytesRead = tr.DecodeBinaryReturnCount(r)
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if r.Err != nil {
return r.Err
} else if err := f(tr); err != nil {
return nil
}
}
return nil
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}
// Size returns an amount of transfer written in log.
func (lg *NEP5TransferLog) Size() int {
return lg.size
}
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// EncodeBinary implements io.Serializable interface.
func (t *NEP5Tracker) EncodeBinary(w *io.BinWriter) {
w.WriteVarBytes(bigint.ToBytes(&t.Balance))
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w.WriteU32LE(t.LastUpdatedBlock)
}
// DecodeBinary implements io.Serializable interface.
func (t *NEP5Tracker) DecodeBinary(r *io.BinReader) {
t.Balance = *bigint.FromBytes(r.ReadVarBytes())
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t.LastUpdatedBlock = r.ReadU32LE()
}
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// EncodeBinary implements io.Serializable interface.
func (t *NEP5Transfer) EncodeBinary(w *io.BinWriter) {
w.WriteBytes(t.Asset[:])
w.WriteBytes(t.Tx[:])
w.WriteBytes(t.From[:])
w.WriteBytes(t.To[:])
w.WriteU32LE(t.Block)
w.WriteU64LE(t.Timestamp)
amountBytes := bigint.ToBytes(&t.Amount)
w.WriteU64LE(uint64(len(amountBytes)))
w.WriteBytes(amountBytes)
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}
// DecodeBinary implements io.Serializable interface.
func (t *NEP5Transfer) DecodeBinary(r *io.BinReader) {
_ = t.DecodeBinaryReturnCount(r)
}
// DecodeBinaryReturnCount decodes NEP5Transfer and returns the number of bytes read.
func (t *NEP5Transfer) DecodeBinaryReturnCount(r *io.BinReader) int {
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r.ReadBytes(t.Asset[:])
r.ReadBytes(t.Tx[:])
r.ReadBytes(t.From[:])
r.ReadBytes(t.To[:])
t.Block = r.ReadU32LE()
t.Timestamp = r.ReadU64LE()
amountLen := r.ReadU64LE()
amountBytes := make([]byte, amountLen)
r.ReadBytes(amountBytes)
t.Amount = *bigint.FromBytes(amountBytes)
return util.Uint160Size*3 + 8 + 4 + (8 + len(amountBytes)) + +util.Uint256Size
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}