github.com/erda-project/erda-infra@v1.0.9/base/servicehub/examples/start-close/main.go (about)

     1  // Copyright (c) 2021 Terminus, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package main
    16  
    17  import (
    18  	"os"
    19  	"time"
    20  
    21  	"github.com/erda-project/erda-infra/base/logs"
    22  	"github.com/erda-project/erda-infra/base/servicehub"
    23  )
    24  
    25  type config struct {
    26  	Message string `file:"message" flag:"msg" default:"hi" desc:"message to show" env:"HELLO_MESSAGE"`
    27  }
    28  
    29  type provider struct {
    30  	Cfg     *config
    31  	Log     logs.Logger
    32  	closeCh chan struct{}
    33  }
    34  
    35  func (p *provider) Init(ctx servicehub.Context) error {
    36  	p.Log.Info("message: ", p.Cfg.Message)
    37  	return nil
    38  }
    39  
    40  func (p *provider) Start() error {
    41  	p.Log.Info("hello provider is starting...")
    42  	tick := time.NewTicker(3 * time.Second)
    43  	defer tick.Stop()
    44  	for {
    45  		select {
    46  		case <-tick.C:
    47  			p.Log.Info("do something...")
    48  		case <-p.closeCh:
    49  			return nil
    50  		}
    51  	}
    52  }
    53  
    54  func (p *provider) Close() error {
    55  	p.Log.Info("hello provider is closing...")
    56  	close(p.closeCh)
    57  	return nil
    58  }
    59  
    60  func init() {
    61  	servicehub.Register("hello-provider", &servicehub.Spec{
    62  		Services:    []string{"hello"},
    63  		Description: "hello for example",
    64  		ConfigFunc:  func() interface{} { return &config{} },
    65  		Creator: func() servicehub.Provider {
    66  			return &provider{
    67  				closeCh: make(chan struct{}),
    68  			}
    69  		},
    70  	})
    71  }
    72  
    73  func main() {
    74  	hub := servicehub.New()
    75  	hub.Run("examples", "", os.Args...)
    76  }