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keeper.go
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keeper.go
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package keeper
import (
"fmt"
"time"
"github.com/tendermint/tendermint/libs/log"
"github.com/cosmos/cosmos-sdk/codec"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/public-awesome/stargaze/x/faucet/internal/types"
)
// Keeper maintains the link to storage and exposes getter/setter methods for the various parts of the state machine
type Keeper struct {
bankKeeper types.BankKeeper
stakingKeeper types.StakingKeeper
defaultAmount int64 // set default amount for each mint.
denomConfig map[string]types.DenomConfig
limit time.Duration // rate limiting for mint, etc 24 * time.Hours
storeKey sdk.StoreKey // Unexposed key to access store from sdk.Context
cdc codec.BinaryMarshaler
}
// NewKeeper creates a new staking Keeper instance
func NewKeeper(
cdc codec.BinaryMarshaler,
key sdk.StoreKey,
bankKeeper types.BankKeeper,
stakingKeeper types.StakingKeeper,
defaultAmount int64,
denomConfig map[string]types.DenomConfig,
limit time.Duration) Keeper {
return Keeper{
bankKeeper: bankKeeper,
stakingKeeper: stakingKeeper,
defaultAmount: defaultAmount,
denomConfig: denomConfig,
limit: limit,
storeKey: key,
cdc: cdc,
}
}
// Logger returns a module-specific logger.
func (k Keeper) Logger(ctx sdk.Context) log.Logger {
return ctx.Logger().With("module", fmt.Sprintf("x/%s", types.ModuleName))
}
// Limit returns the configured limit
func (k Keeper) Limit() time.Duration {
return k.limit
}
func (k Keeper) getDenomConfig(denom string) types.DenomConfig {
c, ok := k.denomConfig[denom]
if !ok {
return types.DenomConfig{
Amount: k.defaultAmount,
BurnBeforeMint: false,
}
}
return c
}
// MintAndSend mint coins and send to minter.
func (k Keeper) MintAndSend(ctx sdk.Context, minter sdk.AccAddress, mintTime int64, denom string) error {
mining := k.getMining(ctx, minter, denom)
// refuse mint in 24 hours
if k.isPresent(ctx, minter, denom) &&
time.Unix(mining.LastTime, 0).Add(k.limit).UTC().After(time.Unix(mintTime, 0)) {
return types.ErrWithdrawTooOften
}
denomConfig := k.getDenomConfig(denom)
balance := k.bankKeeper.GetBalance(ctx, minter, denom)
if denomConfig.BurnBeforeMint && balance.IsValid() && !balance.IsZero() {
err := k.bankKeeper.SendCoinsFromAccountToModule(ctx, minter, types.ModuleName, sdk.NewCoins(balance))
if err != nil {
return err
}
err = k.bankKeeper.BurnCoins(ctx, types.ModuleName, sdk.NewCoins(balance))
if err != nil {
return err
}
}
newCoin := sdk.NewCoin(denom, sdk.NewInt(denomConfig.Amount))
mining.Total = mining.Total.Add(newCoin)
mining.LastTime = mintTime
err := k.setMining(ctx, minter, mining, denom)
if err != nil {
return err
}
k.Logger(ctx).Info("mint coin: %s", newCoin)
err = k.bankKeeper.MintCoins(ctx, types.ModuleName, sdk.NewCoins(newCoin))
if err != nil {
return err
}
err = k.bankKeeper.SendCoinsFromModuleToAccount(ctx, types.ModuleName, minter, sdk.NewCoins(newCoin))
if err != nil {
return err
}
return nil
}
func (k Keeper) getMining(ctx sdk.Context, minter sdk.AccAddress, denom string) types.Mining {
store := ctx.KVStore(k.storeKey)
if !k.isPresent(ctx, minter, denom) {
return types.NewMining(minter, sdk.NewCoin(denom, sdk.NewInt(0)))
}
bz := store.Get(minterKey(minter, denom))
var mining types.Mining
k.cdc.MustUnmarshalBinaryBare(bz, &mining)
return mining
}
func (k Keeper) setMining(ctx sdk.Context, minter sdk.AccAddress, mining types.Mining, denom string) error {
if !mining.Total.IsPositive() {
return types.ErrInvalidCoinAmount
}
store := ctx.KVStore(k.storeKey)
store.Set(minterKey(minter, denom), k.cdc.MustMarshalBinaryBare(&mining))
return nil
}
func minterKey(minter sdk.AccAddress, denom string) []byte {
mBytes := minter.Bytes()
return append(mBytes, []byte(denom)...)
}
// IsPresent check if the name is present in the store or not
func (k Keeper) isPresent(ctx sdk.Context, minter sdk.AccAddress, denom string) bool {
store := ctx.KVStore(k.storeKey)
return store.Has(minterKey(minter, denom))
}
// GetFaucetKey retrieves the faucet key from the store
func (k Keeper) GetFaucetKey(ctx sdk.Context) types.FaucetKey {
store := ctx.KVStore(k.storeKey)
bz := store.Get(types.FaucetStoreKey)
var faucet types.FaucetKey
k.cdc.MustUnmarshalBinaryBare(bz, &faucet)
return faucet
}
// SetFaucetKey sets the faucet key
func (k Keeper) SetFaucetKey(ctx sdk.Context, armor string) {
store := ctx.KVStore(k.storeKey)
faucet := types.NewFaucetKey(armor)
store.Set(types.FaucetStoreKey, k.cdc.MustMarshalBinaryBare(&faucet))
}
// HasFaucetKey checks if faucet key is already stored.
func (k Keeper) HasFaucetKey(ctx sdk.Context) bool {
store := ctx.KVStore(k.storeKey)
return store.Has(types.FaucetStoreKey)
}