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dbadapter.go
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dbadapter.go
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package store
import (
"fmt"
"github.com/cosmos/cosmos-sdk/store/dbadapter"
"github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
"github.com/cosmos/cosmos-sdk/types/kv"
abci "github.com/tendermint/tendermint/abci/types"
)
var commithash = []byte("FAKE_HASH")
//----------------------------------------
// commitDBStoreWrapper should only be used for simulation/debugging,
// as it doesn't compute any commit hash, and it cannot load older state.
// Wrapper type for dbm.Db with implementation of KVStore
type commitDBStoreAdapter struct {
dbadapter.Store
}
var _ types.CommitKVStore = (*commitDBStoreAdapter)(nil)
var _ Queryable = (*commitDBStoreAdapter)(nil)
func (cdsa commitDBStoreAdapter) Commit() types.CommitID {
return types.CommitID{
Version: -1,
Hash: commithash,
}
}
func (cdsa commitDBStoreAdapter) LastCommitID() types.CommitID {
return types.CommitID{
Version: -1,
Hash: commithash,
}
}
func (cdsa commitDBStoreAdapter) SetPruning(_ types.PruningOptions) {}
func (cdsa commitDBStoreAdapter) GetPruning() types.PruningOptions {
return types.PruningOptions{}
}
// Query returns a result correspond to given query
func (cdsa commitDBStoreAdapter) Query(req abci.RequestQuery) (res abci.ResponseQuery) {
if len(req.Data) == 0 {
return sdkerrors.QueryResult(sdkerrors.Wrap(sdkerrors.ErrTxDecode, "query cannot be zero length"))
}
switch req.Path {
case "/key": // get by key
key := req.Data // data holds the key bytes
res.Key = key
res.Value = cdsa.Get(key)
case "/subspace":
pairs := kv.Pairs{
Pairs: make([]kv.Pair, 0),
}
subspace := req.Data
res.Key = subspace
iterator := types.KVStorePrefixIterator(cdsa.Store, subspace)
for ; iterator.Valid(); iterator.Next() {
pairs.Pairs = append(pairs.Pairs, kv.Pair{Key: iterator.Key(), Value: iterator.Value()})
}
iterator.Close()
bz, err := pairs.Marshal()
if err != nil {
panic(fmt.Errorf("failed to marshal KV pairs: %w", err))
}
res.Value = bz
default:
return sdkerrors.QueryResult(sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "unexpected query path: %v", req.Path))
}
return res
}