85 lines
2.9 KiB
Go
85 lines
2.9 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 rpc implements an RPC client that connect to a centralized mock store.
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// Centralazied mock store can be any other mock store implementation that is
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// registered to Ethereum RPC server under mockStore name. Methods that defines
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// mock.GlobalStore are the same that are used by RPC. Example:
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//
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// server := rpc.NewServer()
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// server.RegisterName("mockStore", mem.NewGlobalStore())
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package rpc
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import (
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"fmt"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/rpc"
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"github.com/ethereum/go-ethereum/swarm/log"
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"github.com/ethereum/go-ethereum/swarm/storage/mock"
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)
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// GlobalStore is rpc.Client that connects to a centralized mock store.
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// Closing GlobalStore instance is required to release RPC client resources.
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type GlobalStore struct {
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client *rpc.Client
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}
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// NewGlobalStore creates a new instance of GlobalStore.
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func NewGlobalStore(client *rpc.Client) *GlobalStore {
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return &GlobalStore{
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client: client,
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}
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}
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// Close closes RPC client.
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func (s *GlobalStore) Close() error {
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s.client.Close()
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return nil
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}
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// NewNodeStore returns a new instance of NodeStore that retrieves and stores
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// chunk data only for a node with address addr.
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func (s *GlobalStore) NewNodeStore(addr common.Address) *mock.NodeStore {
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return mock.NewNodeStore(addr, s)
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}
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// Get calls a Get method to RPC server.
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func (s *GlobalStore) Get(addr common.Address, key []byte) (data []byte, err error) {
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err = s.client.Call(&data, "mockStore_get", addr, key)
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if err != nil && err.Error() == "not found" {
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// pass the mock package value of error instead an rpc error
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return data, mock.ErrNotFound
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}
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return data, err
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}
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// Put calls a Put method to RPC server.
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func (s *GlobalStore) Put(addr common.Address, key []byte, data []byte) error {
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err := s.client.Call(nil, "mockStore_put", addr, key, data)
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return err
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}
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// HasKey calls a HasKey method to RPC server.
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func (s *GlobalStore) HasKey(addr common.Address, key []byte) bool {
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var has bool
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if err := s.client.Call(&has, "mockStore_hasKey", addr, key); err != nil {
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log.Error(fmt.Sprintf("mock store HasKey: addr %s, key %064x: %v", addr, key, err))
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return false
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}
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return has
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}
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