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balance_store.go
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balance_store.go
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/*
____ _ _ _____ _ _
/ __ \ | | | | | __ \ | | | |
| | | |_ __ ___| | ___ __| | __ _ ___ _ __ | |__) | __ ___ | |_ ___ ___ ___ | |
| | | | '_ \ / _ \ | / _ \/ _` |/ _` |/ _ \ '__| | ___/ '__/ _ \| __/ _ \ / __/ _ \| |
| |__| | | | | __/ |___| __/ (_| | (_| | __/ | | | | | | (_) | || (_) | (_| (_) | |
\____/|_| |_|\___|______\___|\__,_|\__, |\___|_| |_| |_| \___/ \__\___/ \___\___/|_|
__/ |
|___/
Copyright 2017 - 2019 OneLedger
*/
package balance
import (
"strings"
"github.com/pkg/errors"
"github.com/Oneledger/protocol/data/keys"
"github.com/Oneledger/protocol/serialize"
"github.com/Oneledger/protocol/storage"
)
type Store struct {
State *storage.State
prefix []byte
}
func NewStore(prefix string, state *storage.State) *Store {
return &Store{
State: state,
prefix: storage.Prefix(prefix),
}
}
func (st *Store) WithState(state *storage.State) *Store {
st.State = state
return st
}
func (st *Store) get(key storage.StoreKey) (amt *Amount, err error) {
prefixed := append(st.prefix, storage.StoreKey(key)...)
dat, _ := st.State.Get(prefixed)
amt = NewAmount(0)
if len(dat) == 0 {
return
}
err = serialize.GetSerializer(serialize.PERSISTENT).Deserialize(dat, amt)
return
}
func (st *Store) set(key storage.StoreKey, amt Amount) error {
dat, err := serialize.GetSerializer(serialize.PERSISTENT).Serialize(amt)
if err != nil {
return err
}
prefixed := append(st.prefix, key...)
err = st.State.Set(prefixed, dat)
return err
}
func (st *Store) iterate(addr keys.Address, fn func(c string, amt Amount) bool) bool {
return st.State.IterateRange(
append(st.prefix, addr.String()...),
storage.Rangefix(string(append(st.prefix, addr.String()...))),
true,
func(key, value []byte) bool {
amt := NewAmount(0)
err := serialize.GetSerializer(serialize.PERSISTENT).Deserialize(value, amt)
if err != nil {
return true
}
arr := strings.Split(string(key), storage.DB_PREFIX)
return fn(arr[len(arr)-1], *amt)
},
)
}
func (st *Store) IterateAll(fn func(addr keys.Address, c string, amt Amount) bool) bool {
return st.State.IterateRange(
st.prefix,
storage.Rangefix(string(st.prefix)),
true,
func(key, value []byte) bool {
amt := NewAmount(0)
err := serialize.GetSerializer(serialize.PERSISTENT).Deserialize(value, amt)
if err != nil {
return true
}
arr := strings.Split(string(key), storage.DB_PREFIX)
addr := keys.Address{}
err = addr.UnmarshalText([]byte(arr[1]))
if err != nil {
return true
}
curr := arr[len(arr)-1]
return fn(addr, curr, *amt)
},
)
}
// todo: add back if necessary. address will not work because key will be address+currency
//func (st *Store) Exists(address keys.Address) bool {
// key := append(st.prefix, storage.StoreKey(address)...)
// return st.State.Exists(key)
//}
func (st *Store) SetBalance(addr keys.Address, coin Coin) error {
key := storage.StoreKey(addr.String() + storage.DB_PREFIX + coin.Currency.Name)
return st.set(key, *coin.Amount)
}
func (st *Store) AddToAddress(addr keys.Address, coin Coin) error {
key := storage.StoreKey(addr.String() + storage.DB_PREFIX + coin.Currency.Name)
amt, err := st.get(key)
if err != nil {
return errors.Wrapf(err, "failed to get address balance %s", addr.String())
}
base := coin.Currency.NewCoinFromAmount(*amt)
//fmt.Println("add to", addr.String())
newCoin := base.Plus(coin)
return st.set(key, *newCoin.Amount)
}
func (st *Store) MinusFromAddress(addr keys.Address, coin Coin) error {
key := storage.StoreKey(addr.String() + storage.DB_PREFIX + coin.Currency.Name)
amt, err := st.get(key)
if err != nil {
return errors.Wrapf(err, "failed to get address balance %s", addr.String())
}
base := coin.Currency.NewCoinFromAmount(*amt)
//fmt.Println("minus from", addr.String())
newCoin, err := base.Minus(coin)
if err != nil {
return errors.Wrapf(err, "minus from address: %s, balance: %s, coin: %s", addr.String(), base.String(), coin.String())
}
return st.set(key, *newCoin.Amount)
}
func (st *Store) CheckBalanceFromAddress(addr keys.Address, coin Coin) error {
key := storage.StoreKey(addr.String() + storage.DB_PREFIX + coin.Currency.Name)
amt, err := st.get(key)
if err != nil {
return errors.Wrapf(err, "failed to get address balance %s", addr.String())
}
base := coin.Currency.NewCoinFromAmount(*amt)
//fmt.Println("check balance", addr.String())
_, err = base.Minus(coin)
if err != nil {
return errors.Wrap(err, "minus from address")
}
return nil
}
func (st *Store) GetBalance(address keys.Address, list *CurrencySet) (balance *Balance, err error) {
balance = NewBalance()
fn := balance.setCoin
if address.Equal(keys.Address{}) {
fn = balance.addCoin
}
st.iterate(address, func(c string, amt Amount) bool {
currency, ok := list.GetCurrencyByName(c)
if !ok {
err = errors.New("currency not expected")
return false
}
fn(currency.NewCoinFromAmount(amt))
return false
})
return
}
func (st *Store) GetBalanceForCurr(address keys.Address, curr *Currency) (coin Coin, err error) {
key := storage.StoreKey(address.String() + storage.DB_PREFIX + curr.Name)
amt, err := st.get(key)
if err != nil {
err = errors.Wrapf(err, "failed to get address balance %s", address.String())
return
}
coin = curr.NewCoinFromAmount(*amt)
return
}