mirror of https://github.com/status-im/op-geth.git
91 lines
4.1 KiB
Go
91 lines
4.1 KiB
Go
// Copyright 2015 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 node_test
|
|
|
|
import (
|
|
"fmt"
|
|
"log"
|
|
|
|
"github.com/ethereum/go-ethereum/node"
|
|
"github.com/ethereum/go-ethereum/p2p"
|
|
"github.com/ethereum/go-ethereum/p2p/discover"
|
|
"github.com/ethereum/go-ethereum/rpc"
|
|
)
|
|
|
|
// SampleService is a trivial network service that can be attached to a node for
|
|
// life cycle management.
|
|
//
|
|
// The following methods are needed to implement a node.Service:
|
|
// - Protocols() []p2p.Protocol - devp2p protocols the service can communicate on
|
|
// - APIs() []rpc.API - api methods the service wants to expose on rpc channels
|
|
// - Start() error - method invoked when the node is ready to start the service
|
|
// - Stop() error - method invoked when the node terminates the service
|
|
type SampleService struct{}
|
|
|
|
func (s *SampleService) Protocols() []p2p.Protocol { return nil }
|
|
func (s *SampleService) APIs() []rpc.API { return nil }
|
|
func (s *SampleService) Start(*p2p.Server) error { fmt.Println("Service starting..."); return nil }
|
|
func (s *SampleService) Stop() error { fmt.Println("Service stopping..."); return nil }
|
|
|
|
func ExampleService() {
|
|
// Create a network node to run protocols with the default values. The below list
|
|
// is only used to display each of the configuration options. All of these could
|
|
// have been omitted if the default behavior is desired.
|
|
nodeConfig := &node.Config{
|
|
DataDir: "", // Empty uses ephemeral storage
|
|
PrivateKey: nil, // Nil generates a node key on the fly
|
|
Name: "", // Any textual node name is allowed
|
|
NoDiscovery: false, // Can disable discovering remote nodes
|
|
BootstrapNodes: []*discover.Node{}, // List of bootstrap nodes to use
|
|
ListenAddr: ":0", // Network interface to listen on
|
|
NAT: nil, // UPnP port mapper to use for crossing firewalls
|
|
Dialer: nil, // Custom dialer to use for establishing peer connections
|
|
NoDial: false, // Can prevent this node from dialing out
|
|
MaxPeers: 0, // Number of peers to allow
|
|
MaxPendingPeers: 0, // Number of peers allowed to handshake concurrently
|
|
}
|
|
stack, err := node.New(nodeConfig)
|
|
if err != nil {
|
|
log.Fatalf("Failed to create network node: %v", err)
|
|
}
|
|
// Create and register a simple network service. This is done through the definition
|
|
// of a node.ServiceConstructor that will instantiate a node.Service. The reason for
|
|
// the factory method approach is to support service restarts without relying on the
|
|
// individual implementations' support for such operations.
|
|
constructor := func(context *node.ServiceContext) (node.Service, error) {
|
|
return new(SampleService), nil
|
|
}
|
|
if err := stack.Register(constructor); err != nil {
|
|
log.Fatalf("Failed to register service: %v", err)
|
|
}
|
|
// Boot up the entire protocol stack, do a restart and terminate
|
|
if err := stack.Start(); err != nil {
|
|
log.Fatalf("Failed to start the protocol stack: %v", err)
|
|
}
|
|
if err := stack.Restart(); err != nil {
|
|
log.Fatalf("Failed to restart the protocol stack: %v", err)
|
|
}
|
|
if err := stack.Stop(); err != nil {
|
|
log.Fatalf("Failed to stop the protocol stack: %v", err)
|
|
}
|
|
// Output:
|
|
// Service starting...
|
|
// Service stopping...
|
|
// Service starting...
|
|
// Service stopping...
|
|
}
|