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- // 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"
- )
- // SampleLifecycle 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.Lifecycle:
- // - Start() error - method invoked when the node is ready to start the service
- // - Stop() error - method invoked when the node terminates the service
- type SampleLifecycle struct{}
- func (s *SampleLifecycle) Start() error { fmt.Println("Service starting..."); return nil }
- func (s *SampleLifecycle) Stop() error { fmt.Println("Service stopping..."); return nil }
- func ExampleLifecycle() {
- // 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)
- }
- defer stack.Close()
- // Create and register a simple network Lifecycle.
- service := new(SampleLifecycle)
- stack.RegisterLifecycle(service)
- // 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.Close(); err != nil {
- log.Fatalf("Failed to stop the protocol stack: %v", err)
- }
- // Output:
- // Service starting...
- // Service stopping...
- }
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