mirror of https://github.com/poanetwork/gecko.git
66 lines
1.4 KiB
Go
66 lines
1.4 KiB
Go
// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
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// See the file LICENSE for licensing terms.
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package avm
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import (
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"errors"
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"github.com/ava-labs/gecko/cache"
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"github.com/ava-labs/gecko/ids"
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"github.com/ava-labs/gecko/vms/components/ava"
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)
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var (
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errCacheTypeMismatch = errors.New("type returned from cache doesn't match the expected type")
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)
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func uniqueID(id ids.ID, prefix uint64, cacher cache.Cacher) ids.ID {
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if cachedIDIntf, found := cacher.Get(id); found {
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return cachedIDIntf.(ids.ID)
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}
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uID := id.Prefix(prefix)
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cacher.Put(id, uID)
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return uID
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}
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// state is a thin wrapper around a database to provide, caching, serialization,
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// and de-serialization.
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type state struct{ ava.State }
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// Tx attempts to load a transaction from storage.
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func (s *state) Tx(id ids.ID) (*Tx, error) {
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if txIntf, found := s.Cache.Get(id); found {
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if tx, ok := txIntf.(*Tx); ok {
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return tx, nil
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}
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return nil, errCacheTypeMismatch
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}
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bytes, err := s.DB.Get(id.Bytes())
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if err != nil {
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return nil, err
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}
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// The key was in the database
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tx := &Tx{}
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if err := s.Codec.Unmarshal(bytes, tx); err != nil {
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return nil, err
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}
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tx.Initialize(bytes)
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s.Cache.Put(id, tx)
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return tx, nil
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}
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// SetTx saves the provided transaction to storage.
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func (s *state) SetTx(id ids.ID, tx *Tx) error {
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if tx == nil {
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s.Cache.Evict(id)
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return s.DB.Delete(id.Bytes())
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}
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s.Cache.Put(id, tx)
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return s.DB.Put(id.Bytes(), tx.Bytes())
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}
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