97 lines
1.6 KiB
Go
97 lines
1.6 KiB
Go
package consul
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import (
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"errors"
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"time"
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"github.com/hashicorp/consul/api"
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"github.com/hashicorp/consul/api/watch"
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"github.com/micro/go-micro/config/encoder"
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"github.com/micro/go-micro/config/source"
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)
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type watcher struct {
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e encoder.Encoder
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name string
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stripPrefix string
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wp *watch.Plan
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ch chan *source.ChangeSet
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exit chan bool
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}
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func newWatcher(key, addr, name, stripPrefix string, e encoder.Encoder) (source.Watcher, error) {
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w := &watcher{
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e: e,
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name: name,
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stripPrefix: stripPrefix,
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ch: make(chan *source.ChangeSet),
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exit: make(chan bool),
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}
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wp, err := watch.Parse(map[string]interface{}{"type": "keyprefix", "prefix": key})
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if err != nil {
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return nil, err
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}
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wp.Handler = w.handle
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// wp.Run is a blocking call and will prevent newWatcher from returning
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go wp.Run(addr)
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w.wp = wp
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return w, nil
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}
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func (w *watcher) handle(idx uint64, data interface{}) {
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if data == nil {
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return
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}
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kvs, ok := data.(api.KVPairs)
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if !ok {
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return
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}
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d, err := makeMap(w.e, kvs, w.stripPrefix)
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if err != nil {
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return
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}
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b, err := w.e.Encode(d)
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if err != nil {
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return
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}
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cs := &source.ChangeSet{
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Timestamp: time.Now(),
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Format: w.e.String(),
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Source: w.name,
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Data: b,
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}
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cs.Checksum = cs.Sum()
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w.ch <- cs
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}
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func (w *watcher) Next() (*source.ChangeSet, error) {
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select {
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case cs := <-w.ch:
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return cs, nil
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case <-w.exit:
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return nil, errors.New("watcher stopped")
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}
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}
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func (w *watcher) Stop() error {
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select {
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case <-w.exit:
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return nil
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default:
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w.wp.Stop()
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close(w.exit)
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}
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return nil
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}
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