310 lines
8.3 KiB
Go
310 lines
8.3 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 simulation
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import (
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"encoding/json"
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"errors"
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"io/ioutil"
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"math/rand"
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"os"
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"time"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/p2p/enode"
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"github.com/ethereum/go-ethereum/p2p/simulations"
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"github.com/ethereum/go-ethereum/p2p/simulations/adapters"
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)
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// NodeIDs returns NodeIDs for all nodes in the network.
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func (s *Simulation) NodeIDs() (ids []enode.ID) {
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nodes := s.Net.GetNodes()
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ids = make([]enode.ID, len(nodes))
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for i, node := range nodes {
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ids[i] = node.ID()
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}
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return ids
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}
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// UpNodeIDs returns NodeIDs for nodes that are up in the network.
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func (s *Simulation) UpNodeIDs() (ids []enode.ID) {
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nodes := s.Net.GetNodes()
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for _, node := range nodes {
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if node.Up {
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ids = append(ids, node.ID())
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}
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}
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return ids
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}
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// DownNodeIDs returns NodeIDs for nodes that are stopped in the network.
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func (s *Simulation) DownNodeIDs() (ids []enode.ID) {
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nodes := s.Net.GetNodes()
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for _, node := range nodes {
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if !node.Up {
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ids = append(ids, node.ID())
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}
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}
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return ids
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}
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// AddNodeOption defines the option that can be passed
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// to Simulation.AddNode method.
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type AddNodeOption func(*adapters.NodeConfig)
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// AddNodeWithMsgEvents sets the EnableMsgEvents option
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// to NodeConfig.
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func AddNodeWithMsgEvents(enable bool) AddNodeOption {
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return func(o *adapters.NodeConfig) {
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o.EnableMsgEvents = enable
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}
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}
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// AddNodeWithService specifies a service that should be
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// started on a node. This option can be repeated as variadic
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// argument toe AddNode and other add node related methods.
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// If AddNodeWithService is not specified, all services will be started.
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func AddNodeWithService(serviceName string) AddNodeOption {
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return func(o *adapters.NodeConfig) {
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o.Services = append(o.Services, serviceName)
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}
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}
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// AddNode creates a new node with random configuration,
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// applies provided options to the config and adds the node to network.
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// By default all services will be started on a node. If one or more
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// AddNodeWithService option are provided, only specified services will be started.
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func (s *Simulation) AddNode(opts ...AddNodeOption) (id enode.ID, err error) {
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conf := adapters.RandomNodeConfig()
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for _, o := range opts {
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o(conf)
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}
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if len(conf.Services) == 0 {
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conf.Services = s.serviceNames
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}
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node, err := s.Net.NewNodeWithConfig(conf)
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if err != nil {
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return id, err
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}
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return node.ID(), s.Net.Start(node.ID())
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}
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// AddNodes creates new nodes with random configurations,
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// applies provided options to the config and adds nodes to network.
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func (s *Simulation) AddNodes(count int, opts ...AddNodeOption) (ids []enode.ID, err error) {
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ids = make([]enode.ID, 0, count)
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for i := 0; i < count; i++ {
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id, err := s.AddNode(opts...)
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if err != nil {
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return nil, err
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}
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ids = append(ids, id)
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}
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return ids, nil
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}
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// AddNodesAndConnectFull is a helpper method that combines
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// AddNodes and ConnectNodesFull. Only new nodes will be connected.
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func (s *Simulation) AddNodesAndConnectFull(count int, opts ...AddNodeOption) (ids []enode.ID, err error) {
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if count < 2 {
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return nil, errors.New("count of nodes must be at least 2")
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}
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ids, err = s.AddNodes(count, opts...)
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if err != nil {
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return nil, err
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}
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err = s.Net.ConnectNodesFull(ids)
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if err != nil {
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return nil, err
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}
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return ids, nil
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}
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// AddNodesAndConnectChain is a helpper method that combines
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// AddNodes and ConnectNodesChain. The chain will be continued from the last
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// added node, if there is one in simulation using ConnectToLastNode method.
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func (s *Simulation) AddNodesAndConnectChain(count int, opts ...AddNodeOption) (ids []enode.ID, err error) {
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if count < 2 {
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return nil, errors.New("count of nodes must be at least 2")
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}
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id, err := s.AddNode(opts...)
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if err != nil {
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return nil, err
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}
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err = s.Net.ConnectToLastNode(id)
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if err != nil {
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return nil, err
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}
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ids, err = s.AddNodes(count-1, opts...)
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if err != nil {
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return nil, err
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}
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ids = append([]enode.ID{id}, ids...)
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err = s.Net.ConnectNodesChain(ids)
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if err != nil {
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return nil, err
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}
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return ids, nil
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}
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// AddNodesAndConnectRing is a helpper method that combines
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// AddNodes and ConnectNodesRing.
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func (s *Simulation) AddNodesAndConnectRing(count int, opts ...AddNodeOption) (ids []enode.ID, err error) {
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if count < 2 {
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return nil, errors.New("count of nodes must be at least 2")
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}
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ids, err = s.AddNodes(count, opts...)
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if err != nil {
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return nil, err
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}
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err = s.Net.ConnectNodesRing(ids)
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if err != nil {
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return nil, err
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}
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return ids, nil
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}
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// AddNodesAndConnectStar is a helpper method that combines
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// AddNodes and ConnectNodesStar.
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func (s *Simulation) AddNodesAndConnectStar(count int, opts ...AddNodeOption) (ids []enode.ID, err error) {
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if count < 2 {
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return nil, errors.New("count of nodes must be at least 2")
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}
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ids, err = s.AddNodes(count, opts...)
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if err != nil {
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return nil, err
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}
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err = s.Net.ConnectNodesStar(ids[1:], ids[0])
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if err != nil {
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return nil, err
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}
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return ids, nil
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}
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// UploadSnapshot uploads a snapshot to the simulation
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// This method tries to open the json file provided, applies the config to all nodes
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// and then loads the snapshot into the Simulation network
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func (s *Simulation) UploadSnapshot(snapshotFile string, opts ...AddNodeOption) error {
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f, err := os.Open(snapshotFile)
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if err != nil {
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return err
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}
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defer func() {
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err := f.Close()
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if err != nil {
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log.Error("Error closing snapshot file", "err", err)
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}
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}()
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jsonbyte, err := ioutil.ReadAll(f)
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if err != nil {
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return err
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}
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var snap simulations.Snapshot
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err = json.Unmarshal(jsonbyte, &snap)
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if err != nil {
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return err
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}
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//the snapshot probably has the property EnableMsgEvents not set
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//just in case, set it to true!
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//(we need this to wait for messages before uploading)
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for _, n := range snap.Nodes {
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n.Node.Config.EnableMsgEvents = true
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n.Node.Config.Services = s.serviceNames
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for _, o := range opts {
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o(n.Node.Config)
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}
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}
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log.Info("Waiting for p2p connections to be established...")
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//now we can load the snapshot
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err = s.Net.Load(&snap)
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if err != nil {
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return err
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}
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log.Info("Snapshot loaded")
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return nil
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}
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// StartNode starts a node by NodeID.
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func (s *Simulation) StartNode(id enode.ID) (err error) {
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return s.Net.Start(id)
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}
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// StartRandomNode starts a random node.
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func (s *Simulation) StartRandomNode() (id enode.ID, err error) {
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n := s.Net.GetRandomDownNode()
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if n == nil {
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return id, ErrNodeNotFound
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}
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return n.ID(), s.Net.Start(n.ID())
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}
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// StartRandomNodes starts random nodes.
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func (s *Simulation) StartRandomNodes(count int) (ids []enode.ID, err error) {
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ids = make([]enode.ID, 0, count)
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for i := 0; i < count; i++ {
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n := s.Net.GetRandomDownNode()
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if n == nil {
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return nil, ErrNodeNotFound
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}
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err = s.Net.Start(n.ID())
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if err != nil {
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return nil, err
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}
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ids = append(ids, n.ID())
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}
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return ids, nil
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}
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// StopNode stops a node by NodeID.
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func (s *Simulation) StopNode(id enode.ID) (err error) {
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return s.Net.Stop(id)
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}
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// StopRandomNode stops a random node.
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func (s *Simulation) StopRandomNode() (id enode.ID, err error) {
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n := s.Net.GetRandomUpNode()
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if n == nil {
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return id, ErrNodeNotFound
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}
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return n.ID(), s.Net.Stop(n.ID())
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}
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// StopRandomNodes stops random nodes.
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func (s *Simulation) StopRandomNodes(count int) (ids []enode.ID, err error) {
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ids = make([]enode.ID, 0, count)
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for i := 0; i < count; i++ {
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n := s.Net.GetRandomUpNode()
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if n == nil {
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return nil, ErrNodeNotFound
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}
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err = s.Net.Stop(n.ID())
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if err != nil {
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return nil, err
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}
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ids = append(ids, n.ID())
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}
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return ids, nil
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}
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// seed the random generator for Simulation.randomNode.
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func init() {
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rand.Seed(time.Now().UnixNano())
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}
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