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migrations.go
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migrations.go
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package keeper
import (
"encoding/binary"
"github.com/cosmos/cosmos-sdk/store/prefix"
storetypes "github.com/cosmos/cosmos-sdk/store/types"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/x/upgrade/types"
)
// Migrator is a struct for handling in-place store migrations.
type Migrator struct {
keeper Keeper
}
// NewMigrator returns a new Migrator.
func NewMigrator(keeper Keeper) Migrator {
return Migrator{keeper: keeper}
}
// Migrate1to2 migrates from version 1 to 2.
func (m Migrator) Migrate1to2(ctx sdk.Context) error {
return migrateDoneUpgradeKeys(ctx, m.keeper.storeKey)
}
func migrateDoneUpgradeKeys(ctx sdk.Context, storeKey storetypes.StoreKey) error {
store := ctx.KVStore(storeKey)
oldDoneStore := prefix.NewStore(store, []byte{types.DoneByte})
oldDoneStoreIter := oldDoneStore.Iterator(nil, nil)
defer oldDoneStoreIter.Close()
for ; oldDoneStoreIter.Valid(); oldDoneStoreIter.Next() {
oldKey := oldDoneStoreIter.Key()
upgradeName := string(oldKey)
upgradeHeight := int64(binary.BigEndian.Uint64(oldDoneStoreIter.Value()))
newKey := encodeDoneKey(upgradeName, upgradeHeight)
store.Set(newKey, []byte{1})
oldDoneStore.Delete(oldKey)
}
return nil
}