// 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/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.
	stack, err := node.New(&node.Config{})
	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...
}
.3</option>
<option value='dependabot/npm_and_yarn/devel/electron6/files/elliptic-6.5.4'>dependabot/npm_and_yarn/devel/electron6/files/elliptic-6.5.4</option>
<option value='dependabot/npm_and_yarn/devel/electron6/files/ini-1.3.8'>dependabot/npm_and_yarn/devel/electron6/files/ini-1.3.8</option>
<option value='dependabot/npm_and_yarn/devel/electron6/files/lodash-4.17.19'>dependabot/npm_and_yarn/devel/electron6/files/lodash-4.17.19</option>
<option value='dependabot/npm_and_yarn/devel/electron6/files/lodash.merge-4.6.2'>dependabot/npm_and_yarn/devel/electron6/files/lodash.merge-4.6.2</option>
<option value='dependabot/npm_and_yarn/devel/electron6/files/node-fetch-2.6.1'>dependabot/npm_and_yarn/devel/electron6/files/node-fetch-2.6.1</option>
<option value='dependabot/npm_and_yarn/devel/electron6/files/serve-10.1.2'>dependabot/npm_and_yarn/devel/electron6/files/serve-10.1.2</option>
<option value='gnome-3.22'>gnome-3.22</option>
<option value='gnome-3.24'>gnome-3.24</option>
<option value='gnome-3.26'>gnome-3.26</option>
<option value='gnome-3.28'>gnome-3.28</option>
<option value='gnome-3.32'>gnome-3.32</option>
<option value='gnome-3.36'>gnome-3.36</option>
<option value='gstreamer'>gstreamer</option>
<option value='gstreamer-1.16'>gstreamer-1.16</option>
<option value='gstreamer0.10-removal'>gstreamer0.10-removal</option>
<option value='main' selected='selected'>main</option>
<option value='master'>master</option>
<option value='mate-1.16'>mate-1.16</option>
<option value='mate-1.18'>mate-1.18</option>
<option value='mate-1.20'>mate-1.20</option>
<option value='mate-1.22'>mate-1.22</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>FreeBSD GNOME current development ports (https://github.com/freebsd/freebsd-ports-gnome)</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/about/'>about</a><a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/'>summary</a><a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/refs/'>refs</a><a class='active' href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/log/shells/es/files'>log</a><a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/tree/shells/es/files'>tree</a><a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/commit/shells/es/files'>commit</a><a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/diff/shells/es/files'>diff</a><a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/stats/shells/es/files'>stats</a></td><td class='form'><form class='right' method='get' action='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/log/shells/es/files'>
<select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/log/'>root</a>/<a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/log/shells'>shells</a>/<a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/log/shells/es'>es</a>/<a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/log/shells/es/files'>files</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th></th><th class='left'>Commit message (<a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/log/shells/es/files?showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Age</th><th class='left'>Files</th><th class='left'>Lines</th></tr>