mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
synced 2024-12-25 21:17:16 +00:00
49 lines
1.4 KiB
Go
49 lines
1.4 KiB
Go
// Copyright 2018 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library 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 Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package feed
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"time"
|
|
|
|
"github.com/ethereum/go-ethereum/swarm/storage"
|
|
)
|
|
|
|
const (
|
|
hasherCount = 8
|
|
feedsHashAlgorithm = storage.SHA3Hash
|
|
defaultRetrieveTimeout = 100 * time.Millisecond
|
|
)
|
|
|
|
// cacheEntry caches the last known update of a specific Swarm feed.
|
|
type cacheEntry struct {
|
|
Update
|
|
*bytes.Reader
|
|
lastKey storage.Address
|
|
}
|
|
|
|
// implements storage.LazySectionReader
|
|
func (r *cacheEntry) Size(ctx context.Context, _ chan bool) (int64, error) {
|
|
return int64(len(r.Update.data)), nil
|
|
}
|
|
|
|
//returns the feed's topic
|
|
func (r *cacheEntry) Topic() Topic {
|
|
return r.Feed.Topic
|
|
}
|