62 lines
1.6 KiB
Go
62 lines
1.6 KiB
Go
package db
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import (
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"path/filepath"
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"github.com/ethereum/go-ethereum/log"
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"github.com/syndtr/goleveldb/leveldb"
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"github.com/syndtr/goleveldb/leveldb/errors"
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"github.com/syndtr/goleveldb/leveldb/opt"
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"github.com/syndtr/goleveldb/leveldb/storage"
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)
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type storagePrefix byte
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const (
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// PeersCache is used for the db entries used for peers DB
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PeersCache storagePrefix = iota
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// DeduplicatorCache is used for the db entries used for messages
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// deduplication cache
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DeduplicatorCache
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// MailserversCache is a list of mail servers provided by users.
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MailserversCache
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)
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// Key creates a DB key for a specified service with specified data
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func Key(prefix storagePrefix, data ...[]byte) []byte {
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keyLength := 1
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for _, d := range data {
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keyLength += len(d)
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}
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key := make([]byte, keyLength)
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key[0] = byte(prefix)
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startPos := 1
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for _, d := range data {
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copy(key[startPos:], d[:])
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startPos += len(d)
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}
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return key
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}
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// Create returns status pointer to leveldb.DB.
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func Create(path, dbName string) (*leveldb.DB, error) {
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// Create euphemeral storage if the node config path isn't provided
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if path == "" {
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return leveldb.Open(storage.NewMemStorage(), nil)
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}
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path = filepath.Join(path, dbName)
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return Open(path, &opt.Options{OpenFilesCacheCapacity: 5})
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}
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// Open opens an existing leveldb database
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func Open(path string, opts *opt.Options) (db *leveldb.DB, err error) {
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db, err = leveldb.OpenFile(path, opts)
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if _, iscorrupted := err.(*errors.ErrCorrupted); iscorrupted {
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log.Info("database is corrupted trying to recover", "path", path)
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db, err = leveldb.RecoverFile(path, nil)
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}
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return
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}
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