cosmos-sdk/examples/democoin/x/cool/keeper.go

60 lines
1.4 KiB
Go

package cool
import (
"encoding/json"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/x/bank"
)
// Cool genesis state, containing the genesis trend
type GenesisState struct {
trend string
}
// Keeper - handlers sets/gets of custom variables for your module
type Keeper struct {
ck bank.CoinKeeper
storeKey sdk.StoreKey // The (unexposed) key used to access the store from the Context.
}
// NewKeeper - Returns the Keeper
func NewKeeper(key sdk.StoreKey, bankKeeper bank.CoinKeeper) Keeper {
return Keeper{bankKeeper, key}
}
// Key to knowing the trend on the streets!
var trendKey = []byte("TrendKey")
// GetTrend - returns the current cool trend
func (k Keeper) GetTrend(ctx sdk.Context) string {
store := ctx.KVStore(k.storeKey)
bz := store.Get(trendKey)
return string(bz)
}
// Implements sdk.AccountMapper.
func (k Keeper) setTrend(ctx sdk.Context, newTrend string) {
store := ctx.KVStore(k.storeKey)
store.Set(trendKey, []byte(newTrend))
}
// CheckTrend - Returns true or false based on whether guessedTrend is currently cool or not
func (k Keeper) CheckTrend(ctx sdk.Context, guessedTrend string) bool {
if guessedTrend == k.GetTrend(ctx) {
return true
}
return false
}
// InitGenesis - store the genesis trend
func (k Keeper) InitGenesis(ctx sdk.Context, data json.RawMessage) error {
var state GenesisState
if err := json.Unmarshal(data, &state); err != nil {
return err
}
k.setTrend(ctx, state.trend)
return nil
}