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package eureka
import (
"context"
"gitee.com/tylf2018/go-micro-framework/registry"
)
type watcher struct {
ctx context.Context
cancel context.CancelFunc
watchChan chan struct{}
serverName string
discovery *EurekaDiscovery
}
func newWatch(ctx context.Context, discovery *EurekaDiscovery, serverName string) (*watcher, error) {
w := &watcher{
ctx: ctx,
serverName: serverName,
discovery: discovery,
watchChan: make(chan struct{}, 1),
}
w.ctx, w.cancel = context.WithCancel(ctx)
e := w.discovery.Subscribe(
serverName,
func() {
w.watchChan <- struct{}{}
},
)
return w, e
}
func (w watcher) Next() (services []*registry.ServiceInstance, err error) {
select {
case <-w.ctx.Done():
return nil, w.ctx.Err()
case <-w.watchChan:
instances := w.discovery.GetServiceInstances(w.ctx, w.serverName)
services = make([]*registry.ServiceInstance, 0, len(instances))
for _, instance := range instances {
services = append(services, ®istry.ServiceInstance{
ID: instance.Metadata["ID"],
Name: instance.Metadata["Name"],
Version: instance.Metadata["Version"],
Endpoints: []string{instance.Metadata["Endpoints"]},
Metadata: instance.Metadata,
})
}
return
}
}
func (w *watcher) Stop() error {
w.cancel()
w.discovery.Unsubscribe(w.serverName)
return nil
}
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