Repair Natsjskv Registry

changelog/unreleased/fix-natsjskv-registry.md

@@ -0,0 +1,5 @@
+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.
+
+https://github.com/owncloud/ocis/pull/9620

go.mod

@@ -365,6 +365,8 @@ replace github.com/egirna/icap-client => github.com/fschade/icap-client v0.0.0-2
 
 replace github.com/unrolled/secure => github.com/DeepDiver1975/secure v0.0.0-20240611112133-abc838fb797c
 
+replace github.com/go-micro/plugins/v4/store/nats-js-kv => github.com/kobergj/plugins/v4/store/nats-js-kv v0.0.0-20240716134540-6dfbf5819fbf
+
 // exclude the v2 line of go-sqlite3 which was released accidentally and prevents pulling in newer versions of go-sqlite3
 // see https://github.com/mattn/go-sqlite3/issues/965 for more details
 exclude github.com/mattn/go-sqlite3 v2.0.3+incompatible

go.sum

@@ -1218,8 +1218,6 @@ github.com/go-micro/plugins/v4/server/http v1.2.2 h1:UK2/09AU0zV3wHELuR72TZzVU2v
 github.com/go-micro/plugins/v4/server/http v1.2.2/go.mod h1:YuAjaSPxcn3LI8j2FUsqx0Rxunrj4YwDV41Ax76rLl0=
 github.com/go-micro/plugins/v4/store/nats-js v1.2.1-0.20231129143103-d72facc652f0 h1:Qa1EBQ9UyCGecFAJQovl/MHGnvbcvDaM3qUoAG5Lnvk=
 github.com/go-micro/plugins/v4/store/nats-js v1.2.1-0.20231129143103-d72facc652f0/go.mod h1:aCRl8JQmqIaonOl88nFPY/BOQnHPVHY9ngStzLkXnYk=
-github.com/go-micro/plugins/v4/store/nats-js-kv v0.0.0-20231226212146-94a49ba3e06e h1:hwH0qXT0J3UFYRi0UD+e3ItL92oW+jdPFA+3o/j6ASg=
-github.com/go-micro/plugins/v4/store/nats-js-kv v0.0.0-20231226212146-94a49ba3e06e/go.mod h1:Goi4eJ9SrKkxE6NsAVqBVNxfQFbwb7UbyII6743ldgM=
 github.com/go-micro/plugins/v4/store/redis v1.2.1 h1:d9kwr9bSpoK9vkHkqcv+isQUbgBCHpfwCV57pcAPS6c=
 github.com/go-micro/plugins/v4/store/redis v1.2.1/go.mod h1:MbCG0YiyPqETTtm7uHFmxQNCaW1o9hBoYtFwhbVjLUg=
 github.com/go-micro/plugins/v4/transport/grpc v1.1.0 h1:mXfDYfFQLnVDzjGY3o84oe4prfux9h8txsnA19dKsj8=
@@ -1613,6 +1611,8 @@ github.com/klauspost/cpuid/v2 v2.0.1/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa02
 github.com/klauspost/cpuid/v2 v2.0.9/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
 github.com/klauspost/cpuid/v2 v2.2.6 h1:ndNyv040zDGIDh8thGkXYjnFtiN02M1PVVF+JE/48xc=
 github.com/klauspost/cpuid/v2 v2.2.6/go.mod h1:Lcz8mBdAVJIBVzewtcLocK12l3Y+JytZYpaMropDUws=
+github.com/kobergj/plugins/v4/store/nats-js-kv v0.0.0-20240716134540-6dfbf5819fbf h1:X4Hm7mZFAE+vJZ62mcXuH9BywmKiAr9B4V5LQLcTr70=
+github.com/kobergj/plugins/v4/store/nats-js-kv v0.0.0-20240716134540-6dfbf5819fbf/go.mod h1:pjcozWijkNPbEtX5SIQaxEW/h8VAVZYTLx+70bmB3LY=
 github.com/kolo/xmlrpc v0.0.0-20200310150728-e0350524596b/go.mod h1:o03bZfuBwAXHetKXuInt4S7omeXUu62/A845kiycsSQ=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/konsorten/go-windows-terminal-sequences v1.0.2/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=

ocis-pkg/natsjsregistry/registry.go

@@ -12,6 +12,7 @@ import (
 	"time"
 
 	natsjskv "github.com/go-micro/plugins/v4/store/nats-js-kv"
+	"github.com/google/uuid"
 	"github.com/nats-io/nats.go"
 	"go-micro.dev/v4/registry"
 	"go-micro.dev/v4/store"
@@ -23,6 +24,8 @@ var (
 	_registryAddressEnv  = "MICRO_REGISTRY_ADDRESS"
 	_registryUsernameEnv = "MICRO_REGISTRY_AUTH_USERNAME"
 	_registryPasswordEnv = "MICRO_REGISTRY_AUTH_PASSWORD"
+
+	_serviceDelimiter = "/"
 )
 
 func init() {
@@ -80,76 +83,93 @@ func (n *storeregistry) Register(s *registry.Service, _ ...registry.RegisterOpti
 	if s == nil {
 		return errors.New("wont store nil service")
 	}
+
+	unique := uuid.New().String()
+	if s.Metadata == nil {
+		s.Metadata = make(map[string]string)
+	}
+	s.Metadata["uuid"] = unique
+
 	b, err := json.Marshal(s)
 	if err != nil {
 		return err
 	}
 	return n.store.Write(&store.Record{
-		Key:    s.Name,
+		Key:    s.Name + _serviceDelimiter + unique,
 		Value:  b,
 		Expiry: n.expiry,
 	})
 }
 
-// Deregister removes a service from the registry
+// Deregister removes a service from the registry.
 func (n *storeregistry) Deregister(s *registry.Service, _ ...registry.DeregisterOption) error {
 	n.lock.RLock()
 	defer n.lock.RUnlock()
 
-	return n.store.Delete(s.Name)
+	var unique string
+	if s.Metadata != nil {
+		unique = s.Metadata["uuid"]
+	}
+
+	return n.store.Delete(s.Name + _serviceDelimiter + unique)
 }
 
 // GetService gets a specific service from the registry
 func (n *storeregistry) GetService(s string, _ ...registry.GetOption) ([]*registry.Service, error) {
-	n.lock.RLock()
-	defer n.lock.RUnlock()
-
-	recs, err := n.store.Read(s)
-	if err != nil {
-		return nil, err
-	}
-	svcs := make([]*registry.Service, 0, len(recs))
-	for _, rec := range recs {
-		var s registry.Service
-		if err := json.Unmarshal(rec.Value, &s); err != nil {
-			return nil, err
-		}
-		svcs = append(svcs, &s)
-	}
-	return svcs, nil
+	// avoid listing e.g. `webfinger` when requesting `web` by adding the delimiter to the service name
+	return n.listServices(store.ListPrefix(s + _serviceDelimiter))
 }
 
 // ListServices lists all registered services
 func (n *storeregistry) ListServices(...registry.ListOption) ([]*registry.Service, error) {
+	return n.listServices()
+}
+
+// Watch allowes following the changes in the registry if it would be implemented
+func (n *storeregistry) Watch(...registry.WatchOption) (registry.Watcher, error) {
+	return NewWatcher(n)
+}
+
+// String returns the name of the registry
+func (n *storeregistry) String() string {
+	return n.typ
+}
+
+func (n *storeregistry) listServices(opts ...store.ListOption) ([]*registry.Service, error) {
 	n.lock.RLock()
 	defer n.lock.RUnlock()
 
-	keys, err := n.store.List()
+	keys, err := n.store.List(opts...)
 	if err != nil {
 		return nil, err
 	}
 
-	var svcs []*registry.Service
+	svcs := make([]*registry.Service, 0, len(keys))
 	for _, k := range keys {
-		s, err := n.GetService(k)
+		s, err := n.getService(k)
 		if err != nil {
 			// TODO: continue ?
 			return nil, err
 		}
-		svcs = append(svcs, s...)
+		svcs = append(svcs, s)
 
 	}
 	return svcs, nil
 }
 
-// Watch allowes following the changes in the registry if it would be implemented
-func (n *storeregistry) Watch(...registry.WatchOption) (registry.Watcher, error) {
-	return nil, errors.New("watcher not implemented")
-}
-
-// String returns the name of the registry
-func (n *storeregistry) String() string {
-	return n.typ
+func (n *storeregistry) getService(s string) (*registry.Service, error) {
+	recs, err := n.store.Read(s)
+	if err != nil {
+		return nil, err
+	}
+	if len(recs) == 0 {
+		return nil, registry.ErrNotFound
+	}
+	var svc registry.Service
+	if err := json.Unmarshal(recs[0].Value, &svc); err != nil {
+		return nil, err
+	}
+	return &svc, nil
 }
 
 func (n *storeregistry) storeOptions(opts registry.Options) []store.Option {

ocis-pkg/natsjsregistry/watcher.go

@@ -0,0 +1,74 @@
+package natsjsregistry
+
+import (
+	"errors"
+
+	"github.com/nats-io/nats.go"
+	"go-micro.dev/v4/registry"
+)
+
+// NatsWatcher is the watcher of the nats interface
+type NatsWatcher interface {
+	WatchAll(bucket string, opts ...nats.WatchOpt) (nats.KeyWatcher, error)
+}
+
+// Watcher is used to keep track of changes in the registry
+type Watcher struct {
+	watch   nats.KeyWatcher
+	updates <-chan nats.KeyValueEntry
+	reg     *storeregistry
+}
+
+// NewWatcher returns a new watcher
+func NewWatcher(s *storeregistry) (*Watcher, error) {
+	w, ok := s.store.(NatsWatcher)
+	if !ok {
+		return nil, errors.New("store does not implement watcher interface")
+	}
+
+	watcher, err := w.WatchAll("service-registry")
+	if err != nil {
+		return nil, err
+	}
+
+	return &Watcher{
+		watch:   watcher,
+		updates: watcher.Updates(),
+		reg:     s,
+	}, nil
+}
+
+// Next returns the next result. It is a blocking call
+func (w *Watcher) Next() (*registry.Result, error) {
+	kve := <-w.updates
+	if kve == nil {
+		return nil, errors.New("watcher stopped")
+	}
+
+	service, err := w.reg.getService(kve.Key())
+	if err != nil {
+		return nil, err
+	}
+
+	var action string
+	switch kve.Operation() {
+	default:
+		action = "create"
+	case nats.KeyValuePut:
+		action = "create"
+	case nats.KeyValueDelete:
+		action = "delete"
+	case nats.KeyValuePurge:
+		action = "delete"
+	}
+
+	return &registry.Result{
+		Service: service,
+		Action:  action,
+	}, nil
+}
+
+// Stop stops the watcher
+func (w *Watcher) Stop() {
+	_ = w.watch.Stop()
+}

vendor/modules.txt

@@ -966,7 +966,7 @@ github.com/go-micro/plugins/v4/server/http
 # github.com/go-micro/plugins/v4/store/nats-js v1.2.1-0.20231129143103-d72facc652f0
 ## explicit; go 1.21
 github.com/go-micro/plugins/v4/store/nats-js
-# github.com/go-micro/plugins/v4/store/nats-js-kv v0.0.0-20231226212146-94a49ba3e06e
+# github.com/go-micro/plugins/v4/store/nats-js-kv v0.0.0-20231226212146-94a49ba3e06e => github.com/kobergj/plugins/v4/store/nats-js-kv v0.0.0-20240716134540-6dfbf5819fbf
 ## explicit; go 1.21
 github.com/go-micro/plugins/v4/store/nats-js-kv
 # github.com/go-micro/plugins/v4/store/redis v1.2.1
@@ -2435,3 +2435,4 @@ stash.kopano.io/kgol/rndm
 # github.com/studio-b12/gowebdav => github.com/aduffeck/gowebdav v0.0.0-20231215102054-212d4a4374f6
 # github.com/egirna/icap-client => github.com/fschade/icap-client v0.0.0-20240123094924-5af178158eaf
 # github.com/unrolled/secure => github.com/DeepDiver1975/secure v0.0.0-20240611112133-abc838fb797c
+# github.com/go-micro/plugins/v4/store/nats-js-kv => github.com/kobergj/plugins/v4/store/nats-js-kv v0.0.0-20240716134540-6dfbf5819fbf