gitee.com/evanscat/viper@v1.7.2/remote/remote.go (about)

     1  // Copyright © 2015 Steve Francia <spf@spf13.com>.
     2  //
     3  // Use of this source code is governed by an MIT-style
     4  // license that can be found in the LICENSE file.
     5  
     6  // Package remote integrates the remote features of Viper.
     7  package remote
     8  
     9  import (
    10  	"bytes"
    11  	"io"
    12  	"os"
    13  
    14  	crypt "gitee.com/evanscat/crypt/config"
    15  
    16  	"gitee.com/evanscat/viper"
    17  )
    18  
    19  type remoteConfigProvider struct{}
    20  
    21  func (rc remoteConfigProvider) Get(rp viper.RemoteProvider) (io.Reader, error) {
    22  	cm, err := getConfigManager(rp)
    23  	if err != nil {
    24  		return nil, err
    25  	}
    26  	b, err := cm.Get(rp.Path())
    27  	if err != nil {
    28  		return nil, err
    29  	}
    30  	return bytes.NewReader(b), nil
    31  }
    32  
    33  func (rc remoteConfigProvider) Watch(rp viper.RemoteProvider) (io.Reader, error) {
    34  	cm, err := getConfigManager(rp)
    35  	if err != nil {
    36  		return nil, err
    37  	}
    38  	resp, err := cm.Get(rp.Path())
    39  	if err != nil {
    40  		return nil, err
    41  	}
    42  
    43  	return bytes.NewReader(resp), nil
    44  }
    45  
    46  func (rc remoteConfigProvider) WatchChannel(rp viper.RemoteProvider) (<-chan *viper.RemoteResponse, chan bool) {
    47  	cm, err := getConfigManager(rp)
    48  	if err != nil {
    49  		return nil, nil
    50  	}
    51  	quit := make(chan bool)
    52  	quitwc := make(chan bool)
    53  	viperResponsCh := make(chan *viper.RemoteResponse)
    54  	cryptoResponseCh := cm.Watch(rp.Path(), quit)
    55  	// need this function to convert the Channel response form crypt.Response to viper.Response
    56  	go func(cr <-chan *crypt.Response, vr chan<- *viper.RemoteResponse, quitwc <-chan bool, quit chan<- bool) {
    57  		for {
    58  			select {
    59  			case <-quitwc:
    60  				quit <- true
    61  				return
    62  			case resp := <-cr:
    63  				vr <- &viper.RemoteResponse{
    64  					Error: resp.Error,
    65  					Value: resp.Value,
    66  				}
    67  			}
    68  		}
    69  	}(cryptoResponseCh, viperResponsCh, quitwc, quit)
    70  
    71  	return viperResponsCh, quitwc
    72  }
    73  
    74  func getConfigManager(rp viper.RemoteProvider) (crypt.ConfigManager, error) {
    75  	var cm crypt.ConfigManager
    76  	var err error
    77  
    78  	if rp.SecretKeyring() != "" {
    79  		var kr *os.File
    80  		kr, err = os.Open(rp.SecretKeyring())
    81  		if err != nil {
    82  			return nil, err
    83  		}
    84  		defer kr.Close()
    85  		switch rp.Provider() {
    86  		case "etcd":
    87  			cm, err = crypt.NewEtcdConfigManager([]string{rp.Endpoint()}, kr)
    88  		default:
    89  			cm, err = crypt.NewConsulConfigManager([]string{rp.Endpoint()}, kr)
    90  		}
    91  	} else {
    92  		switch rp.Provider() {
    93  		case "etcd":
    94  			cm, err = crypt.NewStandardEtcdConfigManager([]string{rp.Endpoint()})
    95  		default:
    96  			cm, err = crypt.NewStandardConsulConfigManager([]string{rp.Endpoint()})
    97  		}
    98  	}
    99  	if err != nil {
   100  		return nil, err
   101  	}
   102  	return cm, nil
   103  }
   104  
   105  func init() {
   106  	viper.RemoteConfig = &remoteConfigProvider{}
   107  }