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// 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 localstore
import (
"github.com/dexon-foundation/dexon/swarm/shed"
"github.com/dexon-foundation/dexon/swarm/storage"
"github.com/syndtr/goleveldb/leveldb"
)
// ModePut enumerates different Putter modes.
type ModePut int
// Putter modes.
const (
// ModePutRequest: when a chunk is received as a result of retrieve request and delivery
ModePutRequest ModePut = iota
// ModePutSync: when a chunk is received via syncing
ModePutSync
// ModePutUpload: when a chunk is created by local upload
ModePutUpload
)
// Putter provides Put method to store Chunks
// to database.
type Putter struct {
db *DB
mode ModePut
}
// NewPutter returns a new Putter on database
// with a specific Mode.
func (db *DB) NewPutter(mode ModePut) *Putter {
return &Putter{
mode: mode,
db: db,
}
}
// Put stores the Chunk to database and depending
// on the Putter mode, it updates required indexes.
func (p *Putter) Put(ch storage.Chunk) (err error) {
return p.db.put(p.mode, chunkToItem(ch))
}
// put stores Item to database and updates other
// indexes. It acquires lockAddr to protect two calls
// of this function for the same address in parallel.
// Item fields Address and Data must not be
// with their nil values.
func (db *DB) put(mode ModePut, item shed.Item) (err error) {
// protect parallel updates
unlock, err := db.lockAddr(item.Address)
if err != nil {
return err
}
defer unlock()
batch := new(leveldb.Batch)
// variables that provide information for operations
// to be done after write batch function successfully executes
var gcSizeChange int64 // number to add or subtract from gcSize
var triggerPullFeed bool // signal pull feed subscriptions to iterate
var triggerPushFeed bool // signal push feed subscriptions to iterate
switch mode {
case ModePutRequest:
// put to indexes: retrieve, gc; it does not enter the syncpool
// check if the chunk already is in the database
// as gc index is updated
i, err := db.retrievalAccessIndex.Get(item)
switch err {
case nil:
item.AccessTimestamp = i.AccessTimestamp
case leveldb.ErrNotFound:
// no chunk accesses
default:
return err
}
i, err = db.retrievalDataIndex.Get(item)
switch err {
case nil:
item.StoreTimestamp = i.StoreTimestamp
case leveldb.ErrNotFound:
// no chunk accesses
default:
return err
}
if item.AccessTimestamp != 0 {
// delete current entry from the gc index
db.gcIndex.DeleteInBatch(batch, item)
gcSizeChange--
}
if item.StoreTimestamp == 0 {
item.StoreTimestamp = now()
}
// update access timestamp
item.AccessTimestamp = now()
// update retrieve access index
db.retrievalAccessIndex.PutInBatch(batch, item)
// add new entry to gc index
db.gcIndex.PutInBatch(batch, item)
db.gcUncountedHashesIndex.PutInBatch(batch, item)
gcSizeChange++
db.retrievalDataIndex.PutInBatch(batch, item)
case ModePutUpload:
// put to indexes: retrieve, push, pull
item.StoreTimestamp = now()
db.retrievalDataIndex.PutInBatch(batch, item)
db.pullIndex.PutInBatch(batch, item)
triggerPullFeed = true
db.pushIndex.PutInBatch(batch, item)
triggerPushFeed = true
case ModePutSync:
// put to indexes: retrieve, pull
item.StoreTimestamp = now()
db.retrievalDataIndex.PutInBatch(batch, item)
db.pullIndex.PutInBatch(batch, item)
triggerPullFeed = true
default:
return ErrInvalidMode
}
err = db.shed.WriteBatch(batch)
if err != nil {
return err
}
if gcSizeChange != 0 {
db.incGCSize(gcSizeChange)
}
if triggerPullFeed {
db.triggerPullSubscriptions(db.po(item.Address))
}
if triggerPushFeed {
db.triggerPushSubscriptions()
}
return nil
}
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