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// Copyright © 2015 Steve Francia <spf@spf13.com>.
//
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
// Package remote integrates the remote features of Viper.
package remote
import (
"bytes"
"github.com/spf13/viper"
crypt "github.com/xordataexchange/crypt/config"
"io"
"os"
)
type remoteConfigProvider struct{}
func (rc remoteConfigProvider) Get(rp viper.RemoteProvider) (io.Reader, error) {
cm, err := getConfigManager(rp)
if err != nil {
return nil, err
}
b, err := cm.Get(rp.Path())
if err != nil {
return nil, err
}
return bytes.NewReader(b), nil
}
func (rc remoteConfigProvider) Watch(rp viper.RemoteProvider) (io.Reader, error) {
cm, err := getConfigManager(rp)
if err != nil {
return nil, err
}
resp, err := cm.Get(rp.Path())
if err != nil {
return nil, err
}
return bytes.NewReader(resp), nil
}
func (rc remoteConfigProvider) WatchChannel(rp viper.RemoteProvider) (<-chan *viper.RemoteResponse, chan bool) {
cm, err := getConfigManager(rp)
if err != nil {
return nil, nil
}
quit := make(chan bool)
quitwc := make(chan bool)
viperResponsCh := make(chan *viper.RemoteResponse)
cryptoResponseCh := cm.Watch(rp.Path(), quit)
// need this function to convert the Channel response form crypt.Response to viper.Response
go func(cr <-chan *crypt.Response, vr chan<- *viper.RemoteResponse, quitwc <-chan bool, quit chan<- bool) {
for {
select {
case <-quitwc:
quit <- true
return
case resp := <-cr:
vr <- &viper.RemoteResponse{
Error: resp.Error,
Value: resp.Value,
}
}
}
}(cryptoResponseCh, viperResponsCh, quitwc, quit)
return viperResponsCh, quitwc
}
func getConfigManager(rp viper.RemoteProvider) (crypt.ConfigManager, error) {
var cm crypt.ConfigManager
var err error
if rp.SecretKeyring() != "" {
kr, err := os.Open(rp.SecretKeyring())
defer kr.Close()
if err != nil {
return nil, err
}
if rp.Provider() == "etcd" {
cm, err = crypt.NewEtcdConfigManager([]string{rp.Endpoint()}, kr)
} else {
cm, err = crypt.NewConsulConfigManager([]string{rp.Endpoint()}, kr)
}
} else {
if rp.Provider() == "etcd" {
cm, err = crypt.NewStandardEtcdConfigManager([]string{rp.Endpoint()})
} else {
cm, err = crypt.NewStandardConsulConfigManager([]string{rp.Endpoint()})
}
}
if err != nil {
return nil, err
}
return cm, nil
}
func init() {
viper.RemoteConfig = &remoteConfigProvider{}
}
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