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