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store.go
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store.go
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package v044
import (
"github.com/cosmos/cosmos-sdk/codec"
"github.com/cosmos/cosmos-sdk/store/prefix"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/types/address"
"github.com/cosmos/cosmos-sdk/x/bank/types"
)
// MigrateStore performs in-place store migrations from v0.43 to v0.44. The
// migration includes:
//
// - Add an additional reverse index from denomination to address.
func MigrateStore(ctx sdk.Context, storeKey sdk.StoreKey, cdc codec.BinaryCodec) error {
store := ctx.KVStore(storeKey)
return addDenomReverseIndex(store, cdc)
}
func addDenomReverseIndex(store sdk.KVStore, cdc codec.BinaryCodec) error {
oldBalancesStore := prefix.NewStore(store, types.BalancesPrefix)
oldBalancesIter := oldBalancesStore.Iterator(nil, nil)
defer oldBalancesIter.Close()
denomPrefixStores := make(map[string]prefix.Store) // memoize prefix stores
for ; oldBalancesIter.Valid(); oldBalancesIter.Next() {
var balance sdk.Coin
if err := cdc.Unmarshal(oldBalancesIter.Value(), &balance); err != nil {
return err
}
addr, err := types.AddressFromBalancesStore(oldBalancesIter.Key())
if err != nil {
return err
}
denomPrefixStore, ok := denomPrefixStores[balance.Denom]
if !ok {
denomPrefixStore = prefix.NewStore(store, types.CreateDenomPrefix(balance.Denom))
denomPrefixStores[balance.Denom] = denomPrefixStore
}
// Store a reverse index from denomination to account address with a
// sentinel value.
denomPrefixStore.Set(address.MustLengthPrefix(addr), []byte{0})
}
return nil
}