mirror of https://github.com/status-im/op-geth.git
149 lines
3.5 KiB
Go
149 lines
3.5 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/>.
|
|
|
|
// memory storage layer for the package blockhash
|
|
|
|
package storage
|
|
|
|
import (
|
|
"context"
|
|
"sync"
|
|
|
|
lru "github.com/hashicorp/golang-lru"
|
|
)
|
|
|
|
type MemStore struct {
|
|
cache *lru.Cache
|
|
requests *lru.Cache
|
|
mu sync.RWMutex
|
|
disabled bool
|
|
}
|
|
|
|
//NewMemStore is instantiating a MemStore cache. We are keeping a record of all outgoing requests for chunks, that
|
|
//should later be delivered by peer nodes, in the `requests` LRU cache. We are also keeping all frequently requested
|
|
//chunks in the `cache` LRU cache.
|
|
//
|
|
//`requests` LRU cache capacity should ideally never be reached, this is why for the time being it should be initialised
|
|
//with the same value as the LDBStore capacity.
|
|
func NewMemStore(params *StoreParams, _ *LDBStore) (m *MemStore) {
|
|
if params.CacheCapacity == 0 {
|
|
return &MemStore{
|
|
disabled: true,
|
|
}
|
|
}
|
|
|
|
onEvicted := func(key interface{}, value interface{}) {
|
|
v := value.(*Chunk)
|
|
<-v.dbStoredC
|
|
}
|
|
c, err := lru.NewWithEvict(int(params.CacheCapacity), onEvicted)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
requestEvicted := func(key interface{}, value interface{}) {
|
|
// temporary remove of the error log, until we figure out the problem, as it is too spamy
|
|
//log.Error("evict called on outgoing request")
|
|
}
|
|
r, err := lru.NewWithEvict(int(params.ChunkRequestsCacheCapacity), requestEvicted)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
return &MemStore{
|
|
cache: c,
|
|
requests: r,
|
|
}
|
|
}
|
|
|
|
func (m *MemStore) Get(ctx context.Context, addr Address) (*Chunk, error) {
|
|
if m.disabled {
|
|
return nil, ErrChunkNotFound
|
|
}
|
|
|
|
m.mu.RLock()
|
|
defer m.mu.RUnlock()
|
|
|
|
r, ok := m.requests.Get(string(addr))
|
|
// it is a request
|
|
if ok {
|
|
return r.(*Chunk), nil
|
|
}
|
|
|
|
// it is not a request
|
|
c, ok := m.cache.Get(string(addr))
|
|
if !ok {
|
|
return nil, ErrChunkNotFound
|
|
}
|
|
return c.(*Chunk), nil
|
|
}
|
|
|
|
func (m *MemStore) Put(ctx context.Context, c *Chunk) {
|
|
if m.disabled {
|
|
return
|
|
}
|
|
|
|
m.mu.Lock()
|
|
defer m.mu.Unlock()
|
|
|
|
// it is a request
|
|
if c.ReqC != nil {
|
|
select {
|
|
case <-c.ReqC:
|
|
if c.GetErrored() != nil {
|
|
m.requests.Remove(string(c.Addr))
|
|
return
|
|
}
|
|
m.cache.Add(string(c.Addr), c)
|
|
m.requests.Remove(string(c.Addr))
|
|
default:
|
|
m.requests.Add(string(c.Addr), c)
|
|
}
|
|
return
|
|
}
|
|
|
|
// it is not a request
|
|
m.cache.Add(string(c.Addr), c)
|
|
m.requests.Remove(string(c.Addr))
|
|
}
|
|
|
|
func (m *MemStore) setCapacity(n int) {
|
|
if n <= 0 {
|
|
m.disabled = true
|
|
} else {
|
|
onEvicted := func(key interface{}, value interface{}) {
|
|
v := value.(*Chunk)
|
|
<-v.dbStoredC
|
|
}
|
|
c, err := lru.NewWithEvict(n, onEvicted)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
r, err := lru.New(defaultChunkRequestsCacheCapacity)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
m = &MemStore{
|
|
cache: c,
|
|
requests: r,
|
|
}
|
|
}
|
|
}
|
|
|
|
func (s *MemStore) Close() {}
|