112 lines
3.7 KiB
Go
112 lines
3.7 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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// Package mock defines types that are used by different implementations
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// of mock storages.
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//
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// Implementations of mock storages are located in directories
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// under this package:
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//
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// - db - LevelDB backend
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// - mem - in memory map backend
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// - rpc - RPC client that can connect to other backends
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//
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// Mock storages can implement Importer and Exporter interfaces
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// for importing and exporting all chunk data that they contain.
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// The exported file is a tar archive with all files named by
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// hexadecimal representations of chunk keys and with content
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// with JSON-encoded ExportedChunk structure. Exported format
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// should be preserved across all mock store implementations.
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package mock
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import (
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"errors"
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"io"
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"github.com/ethereum/go-ethereum/common"
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)
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// ErrNotFound indicates that the chunk is not found.
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var ErrNotFound = errors.New("not found")
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// NodeStore holds the node address and a reference to the GlobalStore
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// in order to access and store chunk data only for one node.
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type NodeStore struct {
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store GlobalStorer
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addr common.Address
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}
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// NewNodeStore creates a new instance of NodeStore that keeps
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// chunk data using GlobalStorer with a provided address.
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func NewNodeStore(addr common.Address, store GlobalStorer) *NodeStore {
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return &NodeStore{
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store: store,
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addr: addr,
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}
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}
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// Get returns chunk data for a key for a node that has the address
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// provided on NodeStore initialization.
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func (n *NodeStore) Get(key []byte) (data []byte, err error) {
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return n.store.Get(n.addr, key)
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}
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// Put saves chunk data for a key for a node that has the address
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// provided on NodeStore initialization.
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func (n *NodeStore) Put(key []byte, data []byte) error {
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return n.store.Put(n.addr, key, data)
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}
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// Delete removes chunk data for a key for a node that has the address
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// provided on NodeStore initialization.
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func (n *NodeStore) Delete(key []byte) error {
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return n.store.Delete(n.addr, key)
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}
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// GlobalStorer defines methods for mock db store
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// that stores chunk data for all swarm nodes.
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// It is used in tests to construct mock NodeStores
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// for swarm nodes and to track and validate chunks.
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type GlobalStorer interface {
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Get(addr common.Address, key []byte) (data []byte, err error)
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Put(addr common.Address, key []byte, data []byte) error
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Delete(addr common.Address, key []byte) error
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HasKey(addr common.Address, key []byte) bool
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// NewNodeStore creates an instance of NodeStore
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// to be used by a single swarm node with
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// address addr.
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NewNodeStore(addr common.Address) *NodeStore
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}
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// Importer defines method for importing mock store data
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// from an exported tar archive.
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type Importer interface {
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Import(r io.Reader) (n int, err error)
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}
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// Exporter defines method for exporting mock store data
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// to a tar archive.
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type Exporter interface {
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Export(w io.Writer) (n int, err error)
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}
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// ExportedChunk is the structure that is saved in tar archive for
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// each chunk as JSON-encoded bytes.
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type ExportedChunk struct {
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Data []byte `json:"d"`
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Addrs []common.Address `json:"a"`
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}
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