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view_store.go
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view_store.go
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package root
import (
"errors"
"io"
dbm "github.com/cosmos/cosmos-sdk/db"
prefixdb "github.com/cosmos/cosmos-sdk/db/prefix"
util "github.com/cosmos/cosmos-sdk/internal"
dbutil "github.com/cosmos/cosmos-sdk/internal/db"
"github.com/cosmos/cosmos-sdk/store/cachekv"
"github.com/cosmos/cosmos-sdk/store/listenkv"
"github.com/cosmos/cosmos-sdk/store/tracekv"
types "github.com/cosmos/cosmos-sdk/store/v2"
"github.com/cosmos/cosmos-sdk/store/v2/smt"
)
var ErrReadOnly = errors.New("cannot modify read-only store")
func (s *viewSubstore) GetStateCommitmentStore() *smt.Store {
return s.stateCommitmentStore
}
// Get implements KVStore.
func (s *viewSubstore) Get(key []byte) []byte {
val, err := s.dataBucket.Get(key)
if err != nil {
panic(err)
}
return val
}
// Has implements KVStore.
func (s *viewSubstore) Has(key []byte) bool {
has, err := s.dataBucket.Has(key)
if err != nil {
panic(err)
}
return has
}
// Set implements KVStore.
func (s *viewSubstore) Set(key []byte, value []byte) {
panic(ErrReadOnly)
}
// Delete implements KVStore.
func (s *viewSubstore) Delete(key []byte) {
panic(ErrReadOnly)
}
// Iterator implements KVStore.
func (s *viewSubstore) Iterator(start, end []byte) types.Iterator {
iter, err := s.dataBucket.Iterator(start, end)
if err != nil {
panic(err)
}
return dbutil.DBToStoreIterator(iter)
}
// ReverseIterator implements KVStore.
func (s *viewSubstore) ReverseIterator(start, end []byte) types.Iterator {
iter, err := s.dataBucket.ReverseIterator(start, end)
if err != nil {
panic(err)
}
return dbutil.DBToStoreIterator(iter)
}
// GetStoreType implements Store.
func (s *viewSubstore) GetStoreType() types.StoreType {
return types.StoreTypePersistent
}
func (st *viewSubstore) CacheWrap() types.CacheWrap {
return cachekv.NewStore(st)
}
func (st *viewSubstore) CacheWrapWithTrace(w io.Writer, tc types.TraceContext) types.CacheWrap {
return cachekv.NewStore(tracekv.NewStore(st, w, tc))
}
func (st *viewSubstore) CacheWrapWithListeners(storeKey types.StoreKey, listeners []types.WriteListener) types.CacheWrap {
return cachekv.NewStore(listenkv.NewStore(st, storeKey, listeners))
}
func (store *Store) getView(version int64) (ret *viewStore, err error) {
stateView, err := store.stateDB.ReaderAt(uint64(version))
if err != nil {
return
}
defer func() {
if err != nil {
err = util.CombineErrors(err, stateView.Discard(), "stateView.Discard also failed")
}
}()
stateCommitmentView := stateView
if store.StateCommitmentDB != nil {
stateCommitmentView, err = store.StateCommitmentDB.ReaderAt(uint64(version))
if err != nil {
return
}
defer func() {
if err != nil {
err = util.CombineErrors(err, stateCommitmentView.Discard(), "stateCommitmentView.Discard also failed")
}
}()
}
// Now read this version's schema
schemaView := prefixdb.NewPrefixReader(stateView, schemaPrefix)
defer func() {
if err != nil {
err = util.CombineErrors(err, schemaView.Discard(), "schemaView.Discard also failed")
}
}()
pr, err := readSavedSchema(schemaView)
if err != nil {
return
}
// The migrated contents and schema are not committed until the next store.Commit
ret = &viewStore{
stateView: stateView,
stateCommitmentView: stateCommitmentView,
substoreCache: map[string]*viewSubstore{},
schema: pr.StoreSchema,
}
return
}
func (vs *viewStore) GetKVStore(skey types.StoreKey) types.KVStore {
key := skey.Name()
if _, has := vs.schema[key]; !has {
panic(ErrStoreNotFound(key))
}
ret, err := vs.getSubstore(key)
if err != nil {
panic(err)
}
vs.substoreCache[key] = ret
return ret
}
// Reads but does not update substore cache
func (vs *viewStore) getSubstore(key string) (*viewSubstore, error) {
if cached, has := vs.substoreCache[key]; has {
return cached, nil
}
pfx := substorePrefix(key)
stateR := prefixdb.NewPrefixReader(vs.stateView, pfx)
stateCommitmentR := prefixdb.NewPrefixReader(vs.stateCommitmentView, pfx)
rootHash, err := stateR.Get(merkleRootKey)
if err != nil {
return nil, err
}
return &viewSubstore{
dataBucket: prefixdb.NewPrefixReader(stateR, dataPrefix),
indexBucket: prefixdb.NewPrefixReader(stateR, indexPrefix),
stateCommitmentStore: loadSMT(dbm.ReaderAsReadWriter(stateCommitmentR), rootHash),
}, nil
}