forked from cosmos/cosmos-sdk
/
store.go
57 lines (45 loc) · 1.69 KB
/
store.go
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package v045
import (
"github.com/cosmos/cosmos-sdk/codec"
"github.com/cosmos/cosmos-sdk/store/prefix"
storetypes "github.com/cosmos/cosmos-sdk/store/types"
sdk "github.com/cosmos/cosmos-sdk/types"
v040staking "github.com/cosmos/cosmos-sdk/x/staking/migrations/v040"
)
// MigrateStore performs in-place store migrations from v0.43/v0.44 to v0.45.
// The migration includes:
//
// - Removing delegations that have a zero share or token amount.
func MigrateStore(ctx sdk.Context, storeKey storetypes.StoreKey, cdc codec.BinaryCodec) error {
store := ctx.KVStore(storeKey)
return purgeDelegations(store, cdc)
}
func purgeDelegations(store sdk.KVStore, cdc codec.BinaryCodec) error {
prefixDelStore := prefix.NewStore(store, v040staking.DelegationKey)
delStoreIter := prefixDelStore.Iterator(nil, nil)
defer delStoreIter.Close()
valCache := make(map[string]v040staking.Validator)
for ; delStoreIter.Valid(); delStoreIter.Next() {
var delegation v040staking.Delegation
if err := cdc.Unmarshal(delStoreIter.Value(), &delegation); err != nil {
return err
}
validator, ok := valCache[delegation.ValidatorAddress]
if !ok {
valAddr, err := sdk.ValAddressFromBech32(delegation.ValidatorAddress)
if err != nil {
return err
}
if err := cdc.Unmarshal(store.Get(getValidatorKey(valAddr)), &validator); err != nil {
return err
}
valCache[delegation.ValidatorAddress] = validator
}
// TODO: On-chain, we call BeforeDelegationRemoved prior to removing the
// object from state. Do we need to do the same here?
if validator.TokensFromShares(delegation.Shares).TruncateInt().IsZero() || delegation.Shares.IsZero() {
prefixDelStore.Delete(delStoreIter.Key())
}
}
return nil
}