swarm: network rewrite merge

swarm/storage/chunkstore.go

@@ -0,0 +1,66 @@
+// Copyright 2016 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 storage
+
+import "sync"
+
+/*
+ChunkStore interface is implemented by :
+
+- MemStore: a memory cache
+- DbStore: local disk/db store
+- LocalStore: a combination (sequence of) memStore and dbStore
+- NetStore: cloud storage abstraction layer
+- FakeChunkStore: dummy store which doesn't store anything just implements the interface
+*/
+type ChunkStore interface {
+	Put(*Chunk) // effectively there is no error even if there is an error
+	Get(Address) (*Chunk, error)
+	Close()
+}
+
+// MapChunkStore is a very simple ChunkStore implementation to store chunks in a map in memory.
+type MapChunkStore struct {
+	chunks map[string]*Chunk
+	mu     sync.RWMutex
+}
+
+func NewMapChunkStore() *MapChunkStore {
+	return &MapChunkStore{
+		chunks: make(map[string]*Chunk),
+	}
+}
+
+func (m *MapChunkStore) Put(chunk *Chunk) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.chunks[chunk.Addr.Hex()] = chunk
+	chunk.markAsStored()
+}
+
+func (m *MapChunkStore) Get(addr Address) (*Chunk, error) {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	chunk := m.chunks[addr.Hex()]
+	if chunk == nil {
+		return nil, ErrChunkNotFound
+	}
+	return chunk, nil
+}
+
+func (m *MapChunkStore) Close() {
+}