github.com/inteon/viper@v1.1.1/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  	"github.com/spf13/viper"
    15  	crypt "github.com/xordataexchange/crypt/config"
    16  )
    17  
    18  type remoteConfigProvider struct{}
    19  
    20  func (rc remoteConfigProvider) Get(rp viper.RemoteProvider) (io.Reader, error) {
    21  	cm, err := getConfigManager(rp)
    22  	if err != nil {
    23  		return nil, err
    24  	}
    25  	b, err := cm.Get(rp.Path())
    26  	if err != nil {
    27  		return nil, err
    28  	}
    29  	return bytes.NewReader(b), nil
    30  }
    31  
    32  func (rc remoteConfigProvider) Watch(rp viper.RemoteProvider) (io.Reader, error) {
    33  	cm, err := getConfigManager(rp)
    34  	if err != nil {
    35  		return nil, err
    36  	}
    37  	resp, err := cm.Get(rp.Path())
    38  	if err != nil {
    39  		return nil, err
    40  	}
    41  
    42  	return bytes.NewReader(resp), nil
    43  }
    44  
    45  func (rc remoteConfigProvider) WatchChannel(rp viper.RemoteProvider) (<-chan *viper.RemoteResponse, chan bool) {
    46  	cm, err := getConfigManager(rp)
    47  	if err != nil {
    48  		return nil, nil
    49  	}
    50  	quit := make(chan bool)
    51  	quitwc := make(chan bool)
    52  	viperResponsCh := make(chan *viper.RemoteResponse)
    53  	cryptoResponseCh := cm.Watch(rp.Path(), quit)
    54  	// need this function to convert the Channel response form crypt.Response to viper.Response
    55  	go func(cr <-chan *crypt.Response, vr chan<- *viper.RemoteResponse, quitwc <-chan bool, quit chan<- bool) {
    56  		for {
    57  			select {
    58  			case <-quitwc:
    59  				quit <- true
    60  				return
    61  			case resp := <-cr:
    62  				vr <- &viper.RemoteResponse{
    63  					Error: resp.Error,
    64  					Value: resp.Value,
    65  				}
    66  
    67  			}
    68  
    69  		}
    70  	}(cryptoResponseCh, viperResponsCh, quitwc, quit)
    71  
    72  	return viperResponsCh, quitwc
    73  }
    74  
    75  func getConfigManager(rp viper.RemoteProvider) (crypt.ConfigManager, error) {
    76  	var cm crypt.ConfigManager
    77  	var err error
    78  
    79  	if rp.SecretKeyring() != "" {
    80  		kr, err := os.Open(rp.SecretKeyring())
    81  		defer kr.Close()
    82  		if err != nil {
    83  			return nil, err
    84  		}
    85  		if rp.Provider() == "etcd" {
    86  			cm, err = crypt.NewEtcdConfigManager([]string{rp.Endpoint()}, kr)
    87  		} else {
    88  			cm, err = crypt.NewConsulConfigManager([]string{rp.Endpoint()}, kr)
    89  		}
    90  	} else {
    91  		if rp.Provider() == "etcd" {
    92  			cm, err = crypt.NewStandardEtcdConfigManager([]string{rp.Endpoint()})
    93  		} else {
    94  			cm, err = crypt.NewStandardConsulConfigManager([]string{rp.Endpoint()})
    95  		}
    96  	}
    97  	if err != nil {
    98  		return nil, err
    99  	}
   100  	return cm, nil
   101  }
   102  
   103  func init() {
   104  	viper.RemoteConfig = &remoteConfigProvider{}
   105  }