chore(contrib/registry/consul): repeated judgment <-c.ctx.Done() add notes

contrib/registry/consul/client.go

@@ -204,6 +204,8 @@ func (c *Client) Register(_ context.Context, svc *registry.ServiceInstance, enab
 			ticker := time.NewTicker(time.Second * time.Duration(c.healthcheckInterval))
 			defer ticker.Stop()
 			for {
+				// NOTICE: the try-receive operation here is to try to exit the sender goroutine as early as possible.
+				// https://go101.org/article/channel-closing.html
 				select {
 				case <-c.ctx.Done():
 					_ = c.cli.Agent().ServiceDeregister(svc.ID)

contrib/registry/consul/go.mod

@@ -3,10 +3,13 @@ module github.com/go-kratos/kratos/contrib/registry/consul/v2
 go 1.16
 
 require (
-	github.com/armon/go-metrics v0.3.10 // indirect
 	github.com/go-kratos/kratos/v2 v2.6.1
-	github.com/google/btree v1.0.0 // indirect
 	github.com/hashicorp/consul/api v1.19.1
+)
+
+require (
+	github.com/google/btree v1.0.0 // indirect
+	github.com/armon/go-metrics v0.3.10 // indirect
 	github.com/hashicorp/go-hclog v0.14.1 // indirect
 	github.com/hashicorp/go-immutable-radix v1.3.0 // indirect
 	github.com/hashicorp/go-msgpack v0.5.5 // indirect