mirror of https://github.com/spf13/viper.git
73 lines
1.7 KiB
Go
73 lines
1.7 KiB
Go
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package consul
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import (
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"bytes"
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"github.com/hashicorp/consul/api"
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"github.com/hashicorp/consul/watch"
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"github.com/spf13/viper"
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"io"
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)
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type consulConfigProvider struct{}
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func (rc consulConfigProvider) Get(rp viper.RemoteProvider) (io.Reader, error) {
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config := api.DefaultConfig()
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config.Address = rp.Endpoint()
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client, err := api.NewClient(config)
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if err != nil {
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return nil, err
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}
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kv, _, err := client.KV().Get(rp.Path(), nil)
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if err != nil {
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return nil, err
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}
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return bytes.NewReader(kv.Value), nil
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}
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func (rc consulConfigProvider) Watch(rp viper.RemoteProvider) (io.Reader, error) {
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// TODO same as Get(), but behave like before(viper/remote), maybe record LastIndex in rp?
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resp, quit := newWatcher(rp.Path(), rp.Endpoint())
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r := <-resp
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close(quit)
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return bytes.NewReader(r.Value), r.Error
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}
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func (rc consulConfigProvider) WatchChannel(
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rp viper.RemoteProvider) (resp <-chan *viper.RemoteResponse, quit chan bool) {
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return newWatcher(rp.Path(), rp.Endpoint())
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}
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// To stop watch, just close(quit)
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func newWatcher(key, addr string) (<-chan *viper.RemoteResponse, chan bool) {
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p, err := watch.Parse(map[string]interface{}{"type": "key", "key": key})
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if err != nil {
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return nil, nil
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}
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quit := make(chan bool)
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viperResponseCh := make(chan *viper.RemoteResponse)
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p.Handler = func(index uint64, data interface{}) {
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if data == nil {
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return
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}
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kv, ok := data.(*api.KVPair)
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if !ok {
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return
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}
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select {
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case viperResponseCh <- &viper.RemoteResponse{Value: kv.Value}:
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case <-quit:
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}
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}
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go p.Run(addr)
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// wait quit
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go func() {
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<-quit
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p.Stop()
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}()
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return viperResponseCh, quit
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}
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func init() {
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viper.RemoteConfig = &consulConfigProvider{}
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}
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