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77 lines
1.7 KiB
77 lines
1.7 KiB
package etcd |
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import ( |
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"context" |
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"github.com/go-kratos/kratos/v2/registry" |
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clientv3 "go.etcd.io/etcd/client/v3" |
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) |
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var _ registry.Watcher = (*watcher)(nil) |
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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 clientv3.WatchChan |
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watcher clientv3.Watcher |
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kv clientv3.KV |
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first bool |
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serviceName string |
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} |
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func newWatcher(ctx context.Context, key, name string, client *clientv3.Client) (*watcher, error) { |
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w := &watcher{ |
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key: key, |
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watcher: clientv3.NewWatcher(client), |
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kv: clientv3.NewKV(client), |
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first: true, |
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serviceName: name, |
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} |
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w.ctx, w.cancel = context.WithCancel(ctx) |
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w.watchChan = w.watcher.Watch(w.ctx, key, clientv3.WithPrefix(), clientv3.WithRev(0), clientv3.WithKeysOnly()) |
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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) Next() ([]*registry.ServiceInstance, error) { |
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if w.first { |
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item, err := w.getInstance() |
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w.first = false |
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return item, err |
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} |
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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.getInstance() |
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} |
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} |
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func (w *watcher) Stop() 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) getInstance() ([]*registry.ServiceInstance, error) { |
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resp, err := w.kv.Get(w.ctx, w.key, clientv3.WithPrefix()) |
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if err != nil { |
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return nil, err |
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} |
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items := make([]*registry.ServiceInstance, 0, len(resp.Kvs)) |
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for _, kv := range resp.Kvs { |
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si, err := unmarshal(kv.Value) |
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if err != nil { |
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return nil, err |
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} |
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if si.Name != w.serviceName { |
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continue |
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} |
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items = append(items, si) |
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} |
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return items, nil |
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}
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