93 lines
2.0 KiB
Go
93 lines
2.0 KiB
Go
// Copyright 2018 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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// memory storage layer for the package blockhash
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package storage
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import (
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"context"
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lru "github.com/hashicorp/golang-lru"
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)
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type MemStore struct {
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cache *lru.Cache
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disabled bool
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}
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//NewMemStore is instantiating a MemStore cache keeping all frequently requested
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//chunks in the `cache` LRU cache.
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func NewMemStore(params *StoreParams, _ *LDBStore) (m *MemStore) {
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if params.CacheCapacity == 0 {
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return &MemStore{
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disabled: true,
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}
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}
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c, err := lru.New(int(params.CacheCapacity))
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if err != nil {
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panic(err)
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}
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return &MemStore{
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cache: c,
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}
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}
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// Has needed to implement SyncChunkStore
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func (m *MemStore) Has(_ context.Context, addr Address) bool {
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return m.cache.Contains(addr)
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}
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func (m *MemStore) Get(_ context.Context, addr Address) (Chunk, error) {
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if m.disabled {
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return nil, ErrChunkNotFound
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}
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c, ok := m.cache.Get(string(addr))
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if !ok {
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return nil, ErrChunkNotFound
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}
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return c.(Chunk), nil
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}
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func (m *MemStore) Put(_ context.Context, c Chunk) error {
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if m.disabled {
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return nil
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}
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m.cache.Add(string(c.Address()), c)
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return nil
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}
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func (m *MemStore) setCapacity(n int) {
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if n <= 0 {
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m.disabled = true
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} else {
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c, err := lru.New(n)
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if err != nil {
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panic(err)
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}
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*m = MemStore{
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cache: c,
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}
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}
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}
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func (s *MemStore) Close() {}
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