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65 lines
1.4 KiB
Go
65 lines
1.4 KiB
Go
// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
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//
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// This Source Code Form is subject to the terms of the MIT License.
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// If a copy of the MIT was not distributed with this file,
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// You can obtain one at https://github.com/gogf/gf.
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package etcd
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import (
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"context"
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"github.com/gogf/gf/v2/net/gsvc"
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etcd3 "go.etcd.io/etcd/client/v3"
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)
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var (
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_ gsvc.Watcher = &watcher{}
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)
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type watcher struct {
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key string
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ctx context.Context
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cancel context.CancelFunc
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watchChan etcd3.WatchChan
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watcher etcd3.Watcher
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kv etcd3.KV
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}
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func newWatcher(key string, client *etcd3.Client) (*watcher, error) {
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w := &watcher{
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key: key,
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watcher: etcd3.NewWatcher(client),
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kv: etcd3.NewKV(client),
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}
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w.ctx, w.cancel = context.WithCancel(context.Background())
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w.watchChan = w.watcher.Watch(w.ctx, key, etcd3.WithPrefix(), etcd3.WithRev(0))
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err := w.watcher.RequestProgress(context.Background())
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if err != nil {
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return nil, err
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}
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return w, nil
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}
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func (w *watcher) Proceed() ([]*gsvc.Service, error) {
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select {
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case <-w.ctx.Done():
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return nil, w.ctx.Err()
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case <-w.watchChan:
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return w.getServicesByPrefix()
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}
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}
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func (w *watcher) Close() error {
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w.cancel()
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return w.watcher.Close()
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}
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func (w *watcher) getServicesByPrefix() ([]*gsvc.Service, error) {
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res, err := w.kv.Get(w.ctx, w.key, etcd3.WithPrefix())
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if err != nil {
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return nil, err
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}
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return extractResponseToServices(res)
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}
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