80 lines
2.3 KiB
Go
80 lines
2.3 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package storage
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import (
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"encoding/binary"
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)
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// LocalStore is a combination of inmemory db over a disk persisted db
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// implements a Get/Put with fallback (caching) logic using any 2 ChunkStores
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type LocalStore struct {
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memStore ChunkStore
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DbStore ChunkStore
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}
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// This constructor uses MemStore and DbStore as components
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func NewLocalStore(hash Hasher, params *StoreParams) (*LocalStore, error) {
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dbStore, err := NewDbStore(params.ChunkDbPath, hash, params.DbCapacity, params.Radius)
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if err != nil {
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return nil, err
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}
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return &LocalStore{
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memStore: NewMemStore(dbStore, params.CacheCapacity),
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DbStore: dbStore,
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}, nil
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}
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// LocalStore is itself a chunk store
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// unsafe, in that the data is not integrity checked
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func (self *LocalStore) Put(chunk *Chunk) {
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chunk.dbStored = make(chan bool)
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self.memStore.Put(chunk)
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if chunk.wg != nil {
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chunk.wg.Add(1)
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}
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go func() {
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self.DbStore.Put(chunk)
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if chunk.wg != nil {
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chunk.wg.Done()
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}
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}()
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}
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// Get(chunk *Chunk) looks up a chunk in the local stores
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// This method is blocking until the chunk is retrieved
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// so additional timeout may be needed to wrap this call if
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// ChunkStores are remote and can have long latency
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func (self *LocalStore) Get(key Key) (chunk *Chunk, err error) {
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chunk, err = self.memStore.Get(key)
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if err == nil {
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return
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}
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chunk, err = self.DbStore.Get(key)
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if err != nil {
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return
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}
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chunk.Size = int64(binary.LittleEndian.Uint64(chunk.SData[0:8]))
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self.memStore.Put(chunk)
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return
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}
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// Close local store
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func (self *LocalStore) Close() {
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return
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}
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