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seated_accounts.go
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/
seated_accounts.go
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package account
import (
"bytes"
"fmt"
"io"
"sort"
"sync/atomic"
"github.com/iotaledger/hive.go/ds/shrinkingmap"
"github.com/iotaledger/hive.go/ierrors"
"github.com/iotaledger/hive.go/serializer/v2"
"github.com/iotaledger/hive.go/serializer/v2/stream"
"github.com/iotaledger/hive.go/stringify"
iotago "github.com/iotaledger/iota.go/v4"
)
type SeatIndex uint8
func (s SeatIndex) Bytes() ([]byte, error) {
return []byte{byte(s)}, nil
}
func SeatIndexFromBytes(b []byte) (SeatIndex, int, error) {
if len(b) != 1 {
return 0, 0, ierrors.New("invalid seat index bytes length")
}
return SeatIndex(b[0]), 1, nil
}
type SeatedAccounts struct {
accounts *Accounts
seatsByAccount *shrinkingmap.ShrinkingMap[iotago.AccountID, SeatIndex]
reused atomic.Bool
}
func NewSeatedAccounts(accounts *Accounts, optMembers ...iotago.AccountID) *SeatedAccounts {
s := &SeatedAccounts{
accounts: accounts,
seatsByAccount: shrinkingmap.New[iotago.AccountID, SeatIndex](),
}
sort.Slice(optMembers, func(i int, j int) bool {
return bytes.Compare(optMembers[i][:], optMembers[j][:]) < 0
})
for i, member := range optMembers {
s.seatsByAccount.Set(member, SeatIndex(i))
}
return s
}
func (s *SeatedAccounts) IsReused() bool {
return s.reused.Load()
}
func (s *SeatedAccounts) SetReused() {
s.reused.Store(true)
}
func (s *SeatedAccounts) Set(seat SeatIndex, id iotago.AccountID) bool {
// Check if the account exists.
if _, exists := s.accounts.Get(id); !exists {
return false
}
// Check if the account already has a seat.
if oldSeat, exists := s.seatsByAccount.Get(id); exists {
if oldSeat != seat {
return false
}
}
return s.seatsByAccount.Set(id, seat)
}
func (s *SeatedAccounts) Delete(id iotago.AccountID) bool {
return s.seatsByAccount.Delete(id)
}
func (s *SeatedAccounts) GetSeat(id iotago.AccountID) (seat SeatIndex, exists bool) {
return s.seatsByAccount.Get(id)
}
func (s *SeatedAccounts) IDs() []iotago.AccountID {
return s.accounts.IDs()
}
func (s *SeatedAccounts) HasAccount(id iotago.AccountID) (has bool) {
return s.seatsByAccount.Has(id)
}
func (s *SeatedAccounts) SeatCount() int {
return s.seatsByAccount.Size()
}
func (s *SeatedAccounts) Accounts() (*Accounts, error) {
accounts := NewAccounts()
var err error
s.seatsByAccount.ForEachKey(func(id iotago.AccountID) bool {
pool, exists := s.accounts.Get(id)
if !exists {
panic("account not found")
}
if err = accounts.Set(id, pool); err != nil {
return false
}
return true
})
return accounts, err
}
func (s *SeatedAccounts) Reuse() (*SeatedAccounts, error) {
committeeAccounts, err := s.Accounts()
if err != nil {
return nil, err
}
newCommittee := NewSeatedAccounts(committeeAccounts)
newCommittee.SetReused()
s.seatsByAccount.ForEach(func(id iotago.AccountID, index SeatIndex) bool {
newCommittee.Set(index, id)
return true
})
return newCommittee, nil
}
func (s *SeatedAccounts) String() string {
builder := stringify.NewStructBuilder("SeatedAccounts")
for accountID, seat := range s.seatsByAccount.AsMap() {
builder.AddField(stringify.NewStructField(fmt.Sprintf("seat%d", seat), accountID))
}
return builder.String()
}
func SeatedAccountsFromBytes(b []byte) (*SeatedAccounts, int, error) {
reader := stream.NewByteReader(b)
s, err := SeatedAccountsFromReader(reader)
if err != nil {
return nil, 0, ierrors.Wrap(err, "unable to read accounts from bytes")
}
return s, reader.BytesRead(), nil
}
func SeatedAccountsFromReader(reader io.Reader) (*SeatedAccounts, error) {
accounts, err := AccountsFromReader(reader)
if err != nil {
return nil, ierrors.Wrap(err, "unable to read accounts from bytes")
}
seatsByAccount := shrinkingmap.New[iotago.AccountID, SeatIndex]()
if err := stream.ReadCollection(reader, serializer.SeriLengthPrefixTypeAsUint32, func(i int) error {
accountID, err := stream.Read[iotago.AccountID](reader)
if err != nil {
return ierrors.Wrapf(err, "unable to read accountID at index %d", i)
}
seatIndex, err := stream.Read[SeatIndex](reader)
if err != nil {
return ierrors.Wrapf(err, "unable to read seatIndex at index %d", i)
}
seatsByAccount.Set(accountID, seatIndex)
return nil
}); err != nil {
return nil, ierrors.Wrap(err, "failed to read account data")
}
reused, err := stream.Read[bool](reader)
if err != nil {
return nil, ierrors.Wrap(err, "failed to read reused flag")
}
committee := &SeatedAccounts{accounts: accounts, seatsByAccount: seatsByAccount}
committee.reused.Store(reused)
return committee, nil
}
func (s *SeatedAccounts) Bytes() ([]byte, error) {
byteBuffer := stream.NewByteBuffer()
accountsBytes, err := s.accounts.Bytes()
if err != nil {
return nil, ierrors.Wrap(err, "failed to serialize committee accounts")
}
if err := stream.WriteBytes(byteBuffer, accountsBytes); err != nil {
return nil, ierrors.Wrap(err, "failed to write account bytes")
}
if err := stream.WriteCollection(byteBuffer, serializer.SeriLengthPrefixTypeAsUint32, func() (elementsCount int, err error) {
var innerErr error
s.seatsByAccount.ForEach(func(id iotago.AccountID, seatIndex SeatIndex) bool {
if innerErr = stream.Write(byteBuffer, id); innerErr != nil {
return false
}
if innerErr = stream.Write(byteBuffer, seatIndex); innerErr != nil {
return false
}
return true
})
if innerErr != nil {
return 0, innerErr
}
return s.seatsByAccount.Size(), nil
}); err != nil {
return nil, ierrors.Wrap(err, "failed to write seats by account map")
}
if err := stream.Write(byteBuffer, s.reused.Load()); err != nil {
return nil, ierrors.Wrap(err, "failed to write reused flag")
}
return byteBuffer.Bytes()
}