Improve dmsg client registration

internal/dmsg-discovery/api/api.go

@@ -89,6 +89,7 @@ func New(log logrus.FieldLogger, db store.Storer, m discmetrics.Metrics, testMod
 	r.Post("/dmsg-discovery/entry/{pk}", api.setEntry())
 	r.Delete("/dmsg-discovery/entry", api.delEntry())
 	r.Get("/dmsg-discovery/entries", api.allEntries())
+	r.Get("/dmsg-discovery/visorEntries", api.allVisorEntries())
 	r.Delete("/dmsg-discovery/deregister", api.deregisterEntry())
 	r.Get("/dmsg-discovery/available_servers", api.getAvailableServers())
 	r.Get("/dmsg-discovery/all_servers", api.getAllServers())
@@ -163,6 +164,20 @@ func (a *API) allEntries() func(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+// allVisorEntries returns all visor client entries connected to dmsg
+// URI: /dmsg-discovery/visorEntries
+// Method: GET
+func (a *API) allVisorEntries() func(w http.ResponseWriter, r *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
+		entries, err := a.db.AllVisorEntries(r.Context())
+		if err != nil {
+			a.handleError(w, r, err)
+			return
+		}
+		a.writeJSON(w, r, http.StatusOK, entries)
+	}
+}
+
 // deregisterEntry deletes the client entry associated with the PK requested by the network monitor
 // URI: /dmsg-discovery/deregister/:pk
 // Method: DELETE

internal/dmsg-discovery/store/redis.go

@@ -93,6 +93,13 @@ func (r *redisStore) SetEntry(ctx context.Context, entry *disc.Entry, timeout ti
 			return disc.ErrUnexpected
 		}
 	}
+	if entry.ClientType == "visor" {
+		err = r.client.SAdd(ctx, "visorClients", entry.Static.Hex()).Err()
+		if err != nil {
+			log.WithError(err).Errorf("Failed to add to visorClients (SAdd) from redis")
+			return disc.ErrUnexpected
+		}
+	}
 
 	return nil
 }
@@ -107,6 +114,7 @@ func (r *redisStore) DelEntry(ctx context.Context, staticPubKey cipher.PubKey) e
 	// Delete pubkey from servers or clients set stored
 	r.client.SRem(ctx, "servers", staticPubKey.Hex())
 	r.client.SRem(ctx, "clients", staticPubKey.Hex())
+	r.client.SRem(ctx, "visorClients", staticPubKey.Hex())
 	return nil
 }
 
@@ -233,3 +241,11 @@ func (r *redisStore) AllEntries(ctx context.Context) ([]string, error) {
 	}
 	return clients, err
 }
+
+func (r *redisStore) AllVisorEntries(ctx context.Context) ([]string, error) {
+	clients, err := r.client.SMembers(ctx, "visorClients").Result()
+	if err != nil {
+		return nil, err
+	}
+	return clients, err
+}

internal/dmsg-discovery/store/storer.go

@@ -46,6 +46,9 @@ type Storer interface {
 
 	// AllEntries returns all clients PKs.
 	AllEntries(ctx context.Context) ([]string, error)
+
+	// AllVisorEntries returns all clients PKs.
+	AllVisorEntries(ctx context.Context) ([]string, error)
 }
 
 // Config configures the Store object.

internal/dmsg-discovery/store/testing.go

@@ -217,3 +217,24 @@ func (ms *MockStore) AllEntries(_ context.Context) ([]string, error) {
 	}
 	return entries, nil
 }
+
+// AllVisorEntries implements Storer CountEntries method for MockStore
+func (ms *MockStore) AllVisorEntries(_ context.Context) ([]string, error) {
+	entries := []string{}
+
+	ms.mLock.RLock()
+	defer ms.mLock.RUnlock()
+
+	clients := arrayFromMap(ms.m)
+	for _, entryString := range clients {
+		var e disc.Entry
+
+		err := json.Unmarshal(entryString, &e)
+		if err != nil {
+			return nil, disc.ErrUnexpected
+		}
+
+		entries = append(entries, e.String())
+	}
+	return entries, nil
+}

pkg/disc/entry.go

@@ -115,6 +115,9 @@ type Entry struct {
 	// Contains the instance's client meta if it's to be advertised as a DMSG Client.
 	Client *Client `json:"client,omitempty"`
 
+	// ClientType the instance's client_type meta if it's to be advertised as a DMSG Client.
+	ClientType string `json:"client_type,omitempty"`
+
 	// Contains the instance's server meta if it's to be advertised as a DMSG Server.
 	Server *Server `json:"server,omitempty"`
 

pkg/dmsg/client.go

@@ -32,10 +32,10 @@ type ClientCallbacks struct {
 
 func (sc *ClientCallbacks) ensure() {
 	if sc.OnSessionDial == nil {
-		sc.OnSessionDial = func(network, addr string) (err error) { return nil }
+		sc.OnSessionDial = func(network, addr string) (err error) { return nil } //nolint
 	}
 	if sc.OnSessionDisconnect == nil {
-		sc.OnSessionDisconnect = func(network, addr string, err error) {}
+		sc.OnSessionDisconnect = func(network, addr string, err error) {} //nolint
 	}
 }
 
@@ -44,6 +44,7 @@ type Config struct {
 	MinSessions    int
 	UpdateInterval time.Duration // Duration between discovery entry updates.
 	Callbacks      *ClientCallbacks
+	ClientType     string
 }
 
 // Ensure ensures all config values are set.
@@ -108,10 +109,9 @@ func NewClient(pk cipher.PubKey, sk cipher.SecKey, dc disc.APIClient, conf *Conf
 
 	// Init callback: on set session.
 	c.EntityCommon.setSessionCallback = func(ctx context.Context) error {
-		if err := c.EntityCommon.updateClientEntry(ctx, c.done); err != nil {
+		if err := c.EntityCommon.updateClientEntry(ctx, c.done, c.conf.ClientType); err != nil {
 			return err
 		}
-
 		// Client is 'ready' once we have successfully updated the discovery entry
 		// with at least one delegated server.
 		c.readyOnce.Do(func() { close(c.ready) })
@@ -120,7 +120,7 @@ func NewClient(pk cipher.PubKey, sk cipher.SecKey, dc disc.APIClient, conf *Conf
 
 	// Init callback: on delete session.
 	c.EntityCommon.delSessionCallback = func(ctx context.Context) error {
-		err := c.EntityCommon.updateClientEntry(ctx, c.done)
+		err := c.EntityCommon.updateClientEntry(ctx, c.done, c.conf.ClientType)
 		return err
 	}
 
@@ -458,7 +458,7 @@ func (ce *Client) dialSession(ctx context.Context, entry *disc.Entry) (cs Client
 
 // AllStreams returns all the streams of the current client.
 func (ce *Client) AllStreams() (out []*Stream) {
-	fn := func(port uint16, pv netutil.PorterValue) (next bool) {
+	fn := func(port uint16, pv netutil.PorterValue) (next bool) { //nolint
 		if str, ok := pv.Value.(*Stream); ok {
 			out = append(out, str)
 			return true
@@ -485,6 +485,15 @@ func (ce *Client) AllEntries(ctx context.Context) (entries []string, err error)
 	return entries, err
 }
 
+// AllVisorEntries returns all the entries registered in discovery that are visor
+func (ce *Client) AllVisorEntries(ctx context.Context) (entries []string, err error) {
+	err = netutil.NewDefaultRetrier(ce.log).Do(ctx, func() error {
+		entries, err = ce.dc.AllEntries(ctx)
+		return err
+	})
+	return entries, err
+}
+
 // ConnectedServersPK return keys of all connected dmsg servers
 func (ce *Client) ConnectedServersPK() []string {
 	sessions := ce.allClientSessions(ce.porter)

pkg/dmsg/entity_common.go

@@ -225,7 +225,7 @@ func (c *EntityCommon) updateServerEntryLoop(ctx context.Context, addr string, m
 	}
 }
 
-func (c *EntityCommon) updateClientEntry(ctx context.Context, done chan struct{}) (err error) {
+func (c *EntityCommon) updateClientEntry(ctx context.Context, done chan struct{}, clientType string) (err error) {
 	if isClosed(done) {
 		return nil
 	}
@@ -245,12 +245,13 @@ func (c *EntityCommon) updateClientEntry(ctx context.Context, done chan struct{}
 	entry, err := c.dc.Entry(ctx, c.pk)
 	if err != nil {
 		entry = disc.NewClientEntry(c.pk, 0, srvPKs)
+		entry.ClientType = clientType
 		if err := entry.Sign(c.sk); err != nil {
 			return err
 		}
 		return c.dc.PostEntry(ctx, entry)
 	}
-
+	entry.ClientType = clientType
 	entry.Client.DelegatedServers = srvPKs
 	c.log.WithField("entry", entry).Debug("Updating entry.")
 	return c.dc.PutEntry(ctx, c.sk, entry)