52 lines
1.3 KiB
Go
52 lines
1.3 KiB
Go
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package bank
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import (
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"fmt"
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"github.com/cosmos/cosmos-sdk/types"
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"github.com/cosmos/cosmos-sdk/x/coin"
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crypto "github.com/tendermint/go-crypto"
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)
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// CoinStore manages transfers between accounts
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type CoinStore struct {
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store types.AccountStore
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}
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// SubtractCoins subtracts amt from the coins at the addr.
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func (cs CoinStore) SubtractCoins(ctx types.Context, addr crypto.Address, amt types.Coins) (types.Coins, error) {
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acc, err := cs.store.GetAccount(ctx, addr)
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if err != nil {
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return amt, err
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} else if acc == nil {
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return amt, fmt.Errorf("Sending account (%s) does not exist", addr)
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}
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coins := acc.GetCoins()
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newCoins := coins.Minus(amt)
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if !newCoins.IsNotNegative() {
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return amt, ErrInsufficientCoins(fmt.Sprintf("%s < %s", coins, amt))
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}
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acc.SetCoins(newCoins)
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cs.store.SetAccount(ctx, acc)
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return newCoins, nil
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}
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// AddCoins adds amt to the coins at the addr.
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func (cs CoinStore) AddCoins(ctx types.Context, addr crypto.Address, amt types.Coins) (types.Coins, error) {
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acc, err := cs.store.GetAccount(ctx, addr)
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if err != nil {
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return amt, err
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} else if acc == nil {
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acc = cs.store.NewAccountWithAddress(ctx, addr)
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}
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coins := acc.GetCoins()
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newCoins := coins.Plus(amt)
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acc.SetCoins(newCoins)
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cs.store.SetAccount(ctx, acc)
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return newCoins, nil
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}
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