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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 (
"context"
"fmt"
"time"
"github.com/ethereum/go-ethereum/metrics"
"github.com/ethereum/go-ethereum/swarm/chunk"
"github.com/ethereum/go-ethereum/swarm/shed"
"github.com/syndtr/goleveldb/leveldb"
)
// Put stores the Chunk to database and depending
// on the Putter mode, it updates required indexes.
// Put is required to implement chunk.Store
// interface.
func (db *DB) Put(ctx context.Context, mode chunk.ModePut, ch chunk.Chunk) (exists bool, err error) {
metricName := fmt.Sprintf("localstore.Put.%s", mode)
metrics.GetOrRegisterCounter(metricName, nil).Inc(1)
defer totalTimeMetric(metricName, time.Now())
exists, err = db.put(mode, chunkToItem(ch))
if err != nil {
metrics.GetOrRegisterCounter(metricName+".error", nil).Inc(1)
}
return exists, err
}
// 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 chunk.ModePut, item shed.Item) (exists bool, err error) {
// protect parallel updates
db.batchMu.Lock()
defer db.batchMu.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 chunk.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:
exists = true
item.AccessTimestamp = i.AccessTimestamp
case leveldb.ErrNotFound:
exists = false
// no chunk accesses
default:
return false, err
}
i, err = db.retrievalDataIndex.Get(item)
switch err {
case nil:
exists = true
item.StoreTimestamp = i.StoreTimestamp
item.BinID = i.BinID
case leveldb.ErrNotFound:
// no chunk accesses
exists = false
default:
return false, 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()
}
if item.BinID == 0 {
item.BinID, err = db.binIDs.IncInBatch(batch, uint64(db.po(item.Address)))
if err != nil {
return false, err
}
}
// 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)
gcSizeChange++
db.retrievalDataIndex.PutInBatch(batch, item)
case chunk.ModePutUpload:
// put to indexes: retrieve, push, pull
exists, err = db.retrievalDataIndex.Has(item)
if err != nil {
return false, err
}
if !exists {
item.StoreTimestamp = now()
item.BinID, err = db.binIDs.IncInBatch(batch, uint64(db.po(item.Address)))
if err != nil {
return false, err
}
db.retrievalDataIndex.PutInBatch(batch, item)
db.pullIndex.PutInBatch(batch, item)
triggerPullFeed = true
db.pushIndex.PutInBatch(batch, item)
triggerPushFeed = true
}
case chunk.ModePutSync:
// put to indexes: retrieve, pull
exists, err = db.retrievalDataIndex.Has(item)
if err != nil {
return exists, err
}
if !exists {
item.StoreTimestamp = now()
item.BinID, err = db.binIDs.IncInBatch(batch, uint64(db.po(item.Address)))
if err != nil {
return false, err
}
db.retrievalDataIndex.PutInBatch(batch, item)
db.pullIndex.PutInBatch(batch, item)
triggerPullFeed = true
}
default:
return false, ErrInvalidMode
}
err = db.incGCSizeInBatch(batch, gcSizeChange)
if err != nil {
return false, err
}
err = db.shed.WriteBatch(batch)
if err != nil {
return false, err
}
if triggerPullFeed {
db.triggerPullSubscriptions(db.po(item.Address))
}
if triggerPushFeed {
db.triggerPushSubscriptions()
}
return exists, nil
}
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