Nats registry fixes

changelog/unreleased/fix-natsjskv-registry-2.md

@@ -1,6 +1,8 @@
 Bugfix: Repair nats-js-kv registry
 
 The registry would always send traffic to only one pod. This is now fixed and load should be spread evenly. Also implements watcher method so the cache can use it.
+Internally, it can now distinguish services by version and will aggregate all nodes of the same version into a single service, as expected by the registry cache and watcher.
 
+https://github.com/owncloud/ocis/pull/9734
 https://github.com/owncloud/ocis/pull/9726
 https://github.com/owncloud/ocis/pull/9656

ocis-pkg/natsjsregistry/registry.go

@@ -95,7 +95,7 @@ func (n *storeregistry) Register(s *registry.Service, opts ...registry.RegisterO
 		return err
 	}
 	return n.store.Write(&store.Record{
-		Key:    s.Name + _serviceDelimiter + server.DefaultId,
+		Key:    s.Name + _serviceDelimiter + server.DefaultId + _serviceDelimiter + s.Version,
 		Value:  b,
 		Expiry: options.TTL,
 	})
@@ -105,7 +105,7 @@ func (n *storeregistry) Register(s *registry.Service, opts ...registry.RegisterO
 func (n *storeregistry) Deregister(s *registry.Service, _ ...registry.DeregisterOption) error {
 	n.lock.RLock()
 	defer n.lock.RUnlock()
-	return n.store.Delete(s.Name + _serviceDelimiter + server.DefaultId)
+	return n.store.Delete(s.Name + _serviceDelimiter + server.DefaultId + _serviceDelimiter + s.Version)
 }
 
 // GetService gets a specific service from the registry
@@ -138,20 +138,28 @@ func (n *storeregistry) listServices(opts ...store.ListOption) ([]*registry.Serv
 		return nil, err
 	}
 
-	svcs := make([]*registry.Service, 0, len(keys))
+	versions := map[string]*registry.Service{}
 	for _, k := range keys {
-		s, err := n.getService(k)
+		s, err := n.getNode(k)
 		if err != nil {
 			// TODO: continue ?
 			return nil, err
 		}
+		if versions[s.Version] == nil {
+			versions[s.Version] = s
+		} else {
+			versions[s.Version].Nodes = append(versions[s.Version].Nodes, s.Nodes...)
+		}
+	}
+	svcs := make([]*registry.Service, 0, len(versions))
+	for _, s := range versions {
 		svcs = append(svcs, s)
-
 	}
 	return svcs, nil
 }
 
-func (n *storeregistry) getService(s string) (*registry.Service, error) {
+// getNode retrieves a node from the store. It returns a service to also keep track of the version.
+func (n *storeregistry) getNode(s string) (*registry.Service, error) {
 	recs, err := n.store.Read(s)
 	if err != nil {
 		return nil, err

ocis-pkg/natsjsregistry/watcher.go

@@ -3,6 +3,7 @@ package natsjsregistry
 import (
 	"encoding/json"
 	"errors"
+	"strings"
 
 	natsjskv "github.com/go-micro/plugins/v4/store/nats-js-kv"
 	"github.com/nats-io/nats.go"
@@ -48,9 +49,21 @@ func (w *Watcher) Next() (*registry.Result, error) {
 	}
 
 	var svc registry.Service
-	if err := json.Unmarshal(kve.Value.Data, &svc); err != nil {
-		_ = w.stop()
-		return nil, err
+	if kve.Value.Data == nil {
+		// fake a service
+		parts := strings.SplitN(kve.Value.Key, _serviceDelimiter, 3)
+		if len(parts) != 3 {
+			return nil, errors.New("invalid service key")
+		}
+		svc.Name = parts[0]
+		// ocis registers nodes with a - separator
+		svc.Nodes = []*registry.Node{{Id: parts[0] + "-" + parts[1]}}
+		svc.Version = parts[2]
+	} else {
+		if err := json.Unmarshal(kve.Value.Data, &svc); err != nil {
+			_ = w.stop()
+			return nil, err
+		}
 	}
 
 	return &registry.Result{

ocis-pkg/registry/service.go

@@ -65,6 +65,7 @@ func BuildHTTPService(serviceID, address string, version string) *mRegistry.Serv
 	}
 
 	node := &mRegistry.Node{
+		// This id is read by the registry watcher
 		Id:       serviceID + "-" + server.DefaultId,
 		Address:  net.JoinHostPort(addr, fmt.Sprint(port)),
 		Metadata: make(map[string]string),