/
orders_volume.go
101 lines (87 loc) · 2.73 KB
/
orders_volume.go
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package state
import (
"encoding/binary"
"github.com/pkg/errors"
"github.com/wavesplatform/gowaves/pkg/proto"
)
const (
orderVolumeRecordSize = 8 + 8
)
type orderVolumeRecord struct {
feeFilled uint64
amountFilled uint64
}
func (o *orderVolumeRecord) marshalBinary() ([]byte, error) {
buf := make([]byte, orderVolumeRecordSize)
binary.BigEndian.PutUint64(buf[:8], o.feeFilled)
binary.BigEndian.PutUint64(buf[8:16], o.amountFilled)
return buf, nil
}
func (o *orderVolumeRecord) unmarshalBinary(data []byte) error {
if len(data) != orderVolumeRecordSize {
return errInvalidDataSize
}
o.feeFilled = binary.BigEndian.Uint64(data[:8])
o.amountFilled = binary.BigEndian.Uint64(data[8:16])
return nil
}
type ordersVolumes struct {
hs *historyStorage
}
func newOrdersVolumes(hs *historyStorage) *ordersVolumes {
return &ordersVolumes{hs: hs}
}
func (ov *ordersVolumes) newestVolumeById(orderId []byte) (*orderVolumeRecord, error) {
key := ordersVolumeKey{orderId}
recordBytes, err := ov.hs.newestTopEntryData(key.bytes())
if err != nil {
return nil, err
}
var record orderVolumeRecord
if err := record.unmarshalBinary(recordBytes); err != nil {
return nil, errors.Errorf("failed to unmarshal order volume record: %v\n", err)
}
return &record, nil
}
func (ov *ordersVolumes) addNewRecord(orderId []byte, record *orderVolumeRecord, blockID proto.BlockID) error {
recordBytes, err := record.marshalBinary()
if err != nil {
return err
}
key := ordersVolumeKey{orderId}
return ov.hs.addNewEntry(ordersVolume, key.bytes(), recordBytes, blockID)
}
func (ov *ordersVolumes) increaseFilledFee(orderId []byte, feeChange uint64, blockID proto.BlockID) error {
prevVolume, err := ov.newestVolumeById(orderId)
if err != nil {
// New record.
return ov.addNewRecord(orderId, &orderVolumeRecord{feeFilled: feeChange}, blockID)
}
prevVolume.feeFilled += feeChange
return ov.addNewRecord(orderId, prevVolume, blockID)
}
func (ov *ordersVolumes) increaseFilledAmount(orderId []byte, amountChange uint64, blockID proto.BlockID) error {
prevVolume, err := ov.newestVolumeById(orderId)
if err != nil {
// New record.
return ov.addNewRecord(orderId, &orderVolumeRecord{amountFilled: amountChange}, blockID)
}
prevVolume.amountFilled += amountChange
return ov.addNewRecord(orderId, prevVolume, blockID)
}
func (ov *ordersVolumes) newestFilledFee(orderId []byte) (uint64, error) {
volume, err := ov.newestVolumeById(orderId)
if err != nil {
// No fee volume filled yet.
return 0, nil
}
return volume.feeFilled, nil
}
func (ov *ordersVolumes) newestFilledAmount(orderId []byte) (uint64, error) {
volume, err := ov.newestVolumeById(orderId)
if err != nil {
// No amount volume filled yet.
return 0, nil
}
return volume.amountFilled, nil
}