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keeper.go
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keeper.go
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package bank
import (
"fmt"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/x/auth"
)
const (
costGetCoins sdk.Gas = 10
costHasCoins sdk.Gas = 10
costSetCoins sdk.Gas = 100
costSubtractCoins sdk.Gas = 10
costAddCoins sdk.Gas = 10
)
// Keeper manages transfers between accounts
type Keeper struct {
am auth.AccountMapper
}
// NewKeeper returns a new Keeper
func NewKeeper(am auth.AccountMapper) Keeper {
return Keeper{am: am}
}
// GetCoins returns the coins at the addr.
func (keeper Keeper) GetCoins(ctx sdk.Context, addr sdk.AccAddress) sdk.Coins {
return getCoins(ctx, keeper.am, addr)
}
// SetCoins sets the coins at the addr.
func (keeper Keeper) SetCoins(ctx sdk.Context, addr sdk.AccAddress, amt sdk.Coins) sdk.Error {
return setCoins(ctx, keeper.am, addr, amt)
}
// HasCoins returns whether or not an account has at least amt coins.
func (keeper Keeper) HasCoins(ctx sdk.Context, addr sdk.AccAddress, amt sdk.Coins) bool {
return hasCoins(ctx, keeper.am, addr, amt)
}
// SubtractCoins subtracts amt from the coins at the addr.
func (keeper Keeper) SubtractCoins(ctx sdk.Context, addr sdk.AccAddress, amt sdk.Coins) (sdk.Coins, sdk.Tags, sdk.Error) {
return subtractCoins(ctx, keeper.am, addr, amt)
}
// AddCoins adds amt to the coins at the addr.
func (keeper Keeper) AddCoins(ctx sdk.Context, addr sdk.AccAddress, amt sdk.Coins) (sdk.Coins, sdk.Tags, sdk.Error) {
return addCoins(ctx, keeper.am, addr, amt)
}
// SendCoins moves coins from one account to another
func (keeper Keeper) SendCoins(ctx sdk.Context, fromAddr sdk.AccAddress, toAddr sdk.AccAddress, amt sdk.Coins) (sdk.Tags, sdk.Error) {
return sendCoins(ctx, keeper.am, fromAddr, toAddr, amt)
}
// InputOutputCoins handles a list of inputs and outputs
func (keeper Keeper) InputOutputCoins(ctx sdk.Context, inputs []Input, outputs []Output) (sdk.Tags, sdk.Error) {
return inputOutputCoins(ctx, keeper.am, inputs, outputs)
}
//______________________________________________________________________________________________
// SendKeeper only allows transfers between accounts, without the possibility of creating coins
type SendKeeper struct {
am auth.AccountMapper
}
// NewSendKeeper returns a new Keeper
func NewSendKeeper(am auth.AccountMapper) SendKeeper {
return SendKeeper{am: am}
}
// GetCoins returns the coins at the addr.
func (keeper SendKeeper) GetCoins(ctx sdk.Context, addr sdk.AccAddress) sdk.Coins {
return getCoins(ctx, keeper.am, addr)
}
// HasCoins returns whether or not an account has at least amt coins.
func (keeper SendKeeper) HasCoins(ctx sdk.Context, addr sdk.AccAddress, amt sdk.Coins) bool {
return hasCoins(ctx, keeper.am, addr, amt)
}
// SendCoins moves coins from one account to another
func (keeper SendKeeper) SendCoins(ctx sdk.Context, fromAddr sdk.AccAddress, toAddr sdk.AccAddress, amt sdk.Coins) (sdk.Tags, sdk.Error) {
return sendCoins(ctx, keeper.am, fromAddr, toAddr, amt)
}
// InputOutputCoins handles a list of inputs and outputs
func (keeper SendKeeper) InputOutputCoins(ctx sdk.Context, inputs []Input, outputs []Output) (sdk.Tags, sdk.Error) {
return inputOutputCoins(ctx, keeper.am, inputs, outputs)
}
//______________________________________________________________________________________________
// ViewKeeper only allows reading of balances
type ViewKeeper struct {
am auth.AccountMapper
}
// NewViewKeeper returns a new Keeper
func NewViewKeeper(am auth.AccountMapper) ViewKeeper {
return ViewKeeper{am: am}
}
// GetCoins returns the coins at the addr.
func (keeper ViewKeeper) GetCoins(ctx sdk.Context, addr sdk.AccAddress) sdk.Coins {
return getCoins(ctx, keeper.am, addr)
}
// HasCoins returns whether or not an account has at least amt coins.
func (keeper ViewKeeper) HasCoins(ctx sdk.Context, addr sdk.AccAddress, amt sdk.Coins) bool {
return hasCoins(ctx, keeper.am, addr, amt)
}
//______________________________________________________________________________________________
func getCoins(ctx sdk.Context, am auth.AccountMapper, addr sdk.AccAddress) sdk.Coins {
ctx.GasMeter().ConsumeGas(costGetCoins, "getCoins")
acc := am.GetAccount(ctx, addr)
if acc == nil {
return sdk.Coins{}
}
return acc.GetCoins()
}
func setCoins(ctx sdk.Context, am auth.AccountMapper, addr sdk.AccAddress, amt sdk.Coins) sdk.Error {
ctx.GasMeter().ConsumeGas(costSetCoins, "setCoins")
acc := am.GetAccount(ctx, addr)
if acc == nil {
acc = am.NewAccountWithAddress(ctx, addr)
}
err := acc.SetCoins(amt)
if err != nil {
// Handle w/ #870
panic(err)
}
am.SetAccount(ctx, acc)
return nil
}
// HasCoins returns whether or not an account has at least amt coins.
func hasCoins(ctx sdk.Context, am auth.AccountMapper, addr sdk.AccAddress, amt sdk.Coins) bool {
ctx.GasMeter().ConsumeGas(costHasCoins, "hasCoins")
return getCoins(ctx, am, addr).IsGTE(amt)
}
// SubtractCoins subtracts amt from the coins at the addr.
func subtractCoins(ctx sdk.Context, am auth.AccountMapper, addr sdk.AccAddress, amt sdk.Coins) (sdk.Coins, sdk.Tags, sdk.Error) {
ctx.GasMeter().ConsumeGas(costSubtractCoins, "subtractCoins")
oldCoins := getCoins(ctx, am, addr)
newCoins := oldCoins.Minus(amt)
if !newCoins.IsNotNegative() {
return amt, nil, sdk.ErrInsufficientCoins(fmt.Sprintf("%s < %s", oldCoins, amt))
}
err := setCoins(ctx, am, addr, newCoins)
tags := sdk.NewTags("sender", []byte(addr.String()))
return newCoins, tags, err
}
// AddCoins adds amt to the coins at the addr.
func addCoins(ctx sdk.Context, am auth.AccountMapper, addr sdk.AccAddress, amt sdk.Coins) (sdk.Coins, sdk.Tags, sdk.Error) {
ctx.GasMeter().ConsumeGas(costAddCoins, "addCoins")
oldCoins := getCoins(ctx, am, addr)
newCoins := oldCoins.Plus(amt)
if !newCoins.IsNotNegative() {
return amt, nil, sdk.ErrInsufficientCoins(fmt.Sprintf("%s < %s", oldCoins, amt))
}
err := setCoins(ctx, am, addr, newCoins)
tags := sdk.NewTags("recipient", []byte(addr.String()))
return newCoins, tags, err
}
// SendCoins moves coins from one account to another
// NOTE: Make sure to revert state changes from tx on error
func sendCoins(ctx sdk.Context, am auth.AccountMapper, fromAddr sdk.AccAddress, toAddr sdk.AccAddress, amt sdk.Coins) (sdk.Tags, sdk.Error) {
_, subTags, err := subtractCoins(ctx, am, fromAddr, amt)
if err != nil {
return nil, err
}
_, addTags, err := addCoins(ctx, am, toAddr, amt)
if err != nil {
return nil, err
}
return subTags.AppendTags(addTags), nil
}
// InputOutputCoins handles a list of inputs and outputs
// NOTE: Make sure to revert state changes from tx on error
func inputOutputCoins(ctx sdk.Context, am auth.AccountMapper, inputs []Input, outputs []Output) (sdk.Tags, sdk.Error) {
allTags := sdk.EmptyTags()
for _, in := range inputs {
_, tags, err := subtractCoins(ctx, am, in.Address, in.Coins)
if err != nil {
return nil, err
}
allTags = allTags.AppendTags(tags)
}
for _, out := range outputs {
_, tags, err := addCoins(ctx, am, out.Address, out.Coins)
if err != nil {
return nil, err
}
allTags = allTags.AppendTags(tags)
}
return allTags, nil
}