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87 lines
2.0 KiB
87 lines
2.0 KiB
2 years ago
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package nacos
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import (
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"context"
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"fmt"
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"github.com/go-kratos/kratos/v2/registry"
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"github.com/nacos-group/nacos-sdk-go/clients/naming_client"
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"github.com/nacos-group/nacos-sdk-go/model"
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"github.com/nacos-group/nacos-sdk-go/vo"
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)
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var _ registry.Watcher = (*watcher)(nil)
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type watcher struct {
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serviceName string
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clusters []string
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groupName string
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ctx context.Context
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cancel context.CancelFunc
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watchChan chan struct{}
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cli naming_client.INamingClient
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kind string
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}
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func newWatcher(ctx context.Context, cli naming_client.INamingClient, serviceName, groupName, kind string, clusters []string) (*watcher, error) {
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w := &watcher{
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serviceName: serviceName,
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clusters: clusters,
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groupName: groupName,
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cli: cli,
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kind: kind,
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watchChan: make(chan struct{}, 1),
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}
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w.ctx, w.cancel = context.WithCancel(ctx)
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e := w.cli.Subscribe(&vo.SubscribeParam{
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ServiceName: serviceName,
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Clusters: clusters,
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GroupName: groupName,
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SubscribeCallback: func(services []model.SubscribeService, err error) {
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w.watchChan <- struct{}{}
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},
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})
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return w, e
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}
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func (w *watcher) Next() ([]*registry.ServiceInstance, 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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}
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res, err := w.cli.GetService(vo.GetServiceParam{
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ServiceName: w.serviceName,
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GroupName: w.groupName,
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Clusters: w.clusters,
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})
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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(res.Hosts))
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for _, in := range res.Hosts {
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kind := w.kind
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if k, ok := in.Metadata["kind"]; ok {
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kind = k
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}
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items = append(items, ®istry.ServiceInstance{
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ID: in.InstanceId,
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Name: res.Name,
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Version: in.Metadata["version"],
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Metadata: in.Metadata,
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Endpoints: []string{fmt.Sprintf("%s://%s:%d", kind, in.Ip, in.Port)},
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})
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}
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return items, nil
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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.cli.Unsubscribe(&vo.SubscribeParam{
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ServiceName: w.serviceName,
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GroupName: w.groupName,
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Clusters: w.clusters,
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})
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}
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