b8fec5e4e3
- Extract shared namespace for looking up and hashing keys - Require storage transformers only to implement a loader that associates known keys with metadata - Move key loader/lookup utils to utils directory to avoid multiple "storage" packages in imports
67 lines
1.9 KiB
Go
67 lines
1.9 KiB
Go
// VulcanizeDB
|
|
// Copyright © 2019 Vulcanize
|
|
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Affero General Public License for more details.
|
|
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package storage
|
|
|
|
import (
|
|
"github.com/ethereum/go-ethereum/common"
|
|
"github.com/vulcanize/vulcanizedb/libraries/shared/storage/utils"
|
|
"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
|
|
)
|
|
|
|
type KeysLookup interface {
|
|
Lookup(key common.Hash) (utils.StorageValueMetadata, error)
|
|
SetDB(db *postgres.DB)
|
|
}
|
|
|
|
type keysLookup struct {
|
|
loader KeysLoader
|
|
mappings map[common.Hash]utils.StorageValueMetadata
|
|
}
|
|
|
|
func NewKeysLookup(loader KeysLoader) KeysLookup {
|
|
return &keysLookup{loader: loader, mappings: make(map[common.Hash]utils.StorageValueMetadata)}
|
|
}
|
|
|
|
func (lookup *keysLookup) Lookup(key common.Hash) (utils.StorageValueMetadata, error) {
|
|
metadata, ok := lookup.mappings[key]
|
|
if !ok {
|
|
refreshErr := lookup.refreshMappings()
|
|
if refreshErr != nil {
|
|
return metadata, refreshErr
|
|
}
|
|
metadata, ok = lookup.mappings[key]
|
|
if !ok {
|
|
return metadata, utils.ErrStorageKeyNotFound{Key: key.Hex()}
|
|
}
|
|
}
|
|
return metadata, nil
|
|
}
|
|
|
|
func (lookup *keysLookup) refreshMappings() error {
|
|
var err error
|
|
lookup.mappings, err = lookup.loader.LoadMappings()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
lookup.mappings = utils.AddHashedKeys(lookup.mappings)
|
|
return nil
|
|
}
|
|
|
|
func (lookup *keysLookup) SetDB(db *postgres.DB) {
|
|
lookup.loader.SetDB(db)
|
|
}
|