chore: coding style (#3796)

core/discov/internal/registry.go

@@ -15,7 +15,7 @@ import (
 	"github.com/zeromicro/go-zero/core/logx"
 	"github.com/zeromicro/go-zero/core/syncx"
 	"github.com/zeromicro/go-zero/core/threading"
-	v3rpc "go.etcd.io/etcd/api/v3/v3rpc/rpctypes"
+	"go.etcd.io/etcd/api/v3/v3rpc/rpctypes"
 	clientv3 "go.etcd.io/etcd/client/v3"
 )
 
@@ -24,6 +24,7 @@ var (
 		clusters: make(map[string]*cluster),
 	}
 	connManager = syncx.NewResourceManager()
+	errClosed   = errors.New("etcd monitor chan has been closed")
 )
 
 // A Registry is a registry that manages the etcd client connections.
@@ -294,36 +295,38 @@ func (c *cluster) watch(cli EtcdClient, key string, rev int64) {
 		if err == nil {
 			return
 		}
-		if rev != 0 && errors.Is(err, v3rpc.ErrCompacted) {
-			logx.Errorf("etcd watch stream has been compacted, try to reload, rev %v", rev)
+
+		if rev != 0 && errors.Is(err, rpctypes.ErrCompacted) {
+			logx.Errorf("etcd watch stream has been compacted, try to reload, rev %d", rev)
 			rev = c.load(cli, key)
 		}
+
+		// log the error and retry
+		logx.Error(err)
 	}
 }
 
 func (c *cluster) watchStream(cli EtcdClient, key string, rev int64) error {
 	var rch clientv3.WatchChan
 	if rev != 0 {
-		rch = cli.Watch(clientv3.WithRequireLeader(c.context(cli)), makeKeyPrefix(key), clientv3.WithPrefix(),
-			clientv3.WithRev(rev+1))
+		rch = cli.Watch(clientv3.WithRequireLeader(c.context(cli)), makeKeyPrefix(key),
+			clientv3.WithPrefix(), clientv3.WithRev(rev+1))
 	} else {
-		rch = cli.Watch(clientv3.WithRequireLeader(c.context(cli)), makeKeyPrefix(key), clientv3.WithPrefix())
+		rch = cli.Watch(clientv3.WithRequireLeader(c.context(cli)), makeKeyPrefix(key),
+			clientv3.WithPrefix())
 	}
 
 	for {
 		select {
 		case wresp, ok := <-rch:
 			if !ok {
-				logx.Error("etcd monitor chan has been closed")
-				return errors.New("etcd monitor chan has been closed")
+				return errClosed
 			}
 			if wresp.Canceled {
-				logx.Errorf("etcd monitor chan has been canceled, error: %v", wresp.Err())
-				return wresp.Err()
+				return fmt.Errorf("etcd monitor chan has been canceled, error: %w", wresp.Err())
 			}
 			if wresp.Err() != nil {
-				logx.Error(fmt.Sprintf("etcd monitor chan error: %v", wresp.Err()))
-				return wresp.Err()
+				return fmt.Errorf("etcd monitor chan error: %w", wresp.Err())
 			}
 
 			c.handleWatchEvents(key, wresp.Events)