Add SocketIO subscription system for job-related updates

SocketIO clients can now send a message with `/subscription` event type
in order to subscribe to or unsubscribe from job-related updates.

These job-related updates themselves aren't sent yet, so this is a change
that's impossible to really test. The socketIO code for joining/leaving
rooms is called, though.

internal/manager/webupdates/job_updates.go

@@ -40,3 +40,13 @@ func (b *BiDirComms) BroadcastNewJob(jobUpdate api.JobUpdate) {
 	log.Debug().Interface("jobUpdate", jobUpdate).Msg("socketIO: broadcasting new job")
 	b.BroadcastTo(SocketIORoomJobs, SIOEventJobUpdate, jobUpdate)
 }
+
+// roomForJob will return the SocketIO room name for the given job. Clients in
+// this room will receive info scoped to this job, so for example updates to all
+// tasks of this job.
+//
+// Note that `api.JobUpdate`s themselves are sent to all SocketIO clients, and
+// not to this room.
+func roomForJob(jobUUID string) SocketIORoomName {
+	return SocketIORoomName("job-" + jobUUID)
+}

internal/manager/webupdates/sio_rooms.go

@@ -1,6 +1,14 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 package webupdates
 
+import (
+	"fmt"
+
+	"git.blender.org/flamenco/pkg/api"
+	"github.com/google/uuid"
+	gosocketio "github.com/graarh/golang-socketio"
+)
+
 type SocketIORoomName string
 
 const (
@@ -13,11 +21,59 @@ type SocketIOEventType string
 
 const (
 	// Predefined SocketIO event types.
-	SIOEventChatMessageRcv  SocketIOEventType = "/chat"    // clients send messages here
-	SIOEventChatMessageSend SocketIOEventType = "/message" // messages are broadcasted here
-	SIOEventJobUpdate       SocketIOEventType = "/jobs"    // sends api.JobUpdate
+	SIOEventChatMessageRcv  SocketIOEventType = "/chat"         // clients send chat messages here
+	SIOEventChatMessageSend SocketIOEventType = "/message"      // chat messages are broadcasted here
+	SIOEventJobUpdate       SocketIOEventType = "/jobs"         // sends api.JobUpdate
+	SIOEventSubscription    SocketIOEventType = "/subscription" // clients send api.SocketIOSubscription
 )
 
 func (b *BiDirComms) BroadcastTo(room SocketIORoomName, eventType SocketIOEventType, payload interface{}) {
 	b.sockserv.BroadcastTo(string(room), string(eventType), payload)
 }
+
+func (b *BiDirComms) registerRoomEventHandlers() {
+	_ = b.sockserv.On(string(SIOEventSubscription), b.handleRoomSubscription)
+}
+
+func (b *BiDirComms) handleRoomSubscription(c *gosocketio.Channel, subs api.SocketIOSubscription) string {
+	logger := sioLogger(c)
+	logger = logger.With().
+		Str("op", string(subs.Op)).
+		Str("type", string(subs.Type)).
+		Str("uuid", string(subs.Uuid)).
+		Logger()
+
+	// Make sure the UUID is actually a valid one.
+	uuid, err := uuid.Parse(subs.Uuid)
+	if err != nil {
+		logger.Warn().Msg("socketIO: invalid UUID, ignoring subscription request")
+		return "invalid UUID, ignoring request"
+	}
+
+	var sioRoom SocketIORoomName
+	switch subs.Type {
+	case api.SocketIOSubscriptionTypeJob:
+		sioRoom = roomForJob(uuid.String())
+	default:
+		logger.Warn().Msg("socketIO: invalid subscription type, ignoring")
+		return "invalid subscription type, ignoring request"
+	}
+
+	switch subs.Op {
+	case api.SocketIOSubscriptionOperationSubscribe:
+		err = c.Join(string(sioRoom))
+	case api.SocketIOSubscriptionOperationUnsubscribe:
+		err = c.Leave(string(sioRoom))
+	default:
+		logger.Warn().Msg("socketIO: invalid subscription operation, ignoring")
+		return "invalid subscription operation, ignoring request"
+	}
+
+	if err != nil {
+		logger.Warn().Err(err).Msg("socketIO: performing subscription operation")
+		return fmt.Sprintf("unable to perform subscription operation: %v", err)
+	}
+
+	logger.Info().Msg("socketIO: subscription")
+	return "ok"
+}

internal/manager/webupdates/webupdates.go

@@ -59,6 +59,7 @@ func (b *BiDirComms) registerSIOEventHandlers() {
 	})
 
 	b.registerChatEventHandlers()
+	b.registerRoomEventHandlers()
 }
 
 func sioLogger(c *gosocketio.Channel) zerolog.Logger {

web/app/src/App.vue

@@ -16,8 +16,9 @@
   </div>
   <footer>
     <span class='notifications' v-if="notifs.last">{{ notifs.last.msg }}</span>
-    <update-listener ref="updateListener" :websocketURL="websocketURL" @jobUpdate="onSioJobUpdate"
-      @message="onChatMessage" @sioReconnected="onSIOReconnected" @sioDisconnected="onSIODisconnected" />
+    <update-listener ref="updateListener" :websocketURL="websocketURL" :subscribedJob="jobs.activeJobID"
+      @jobUpdate="onSioJobUpdate" @message="onChatMessage" @sioReconnected="onSIOReconnected"
+      @sioDisconnected="onSIODisconnected" />
   </footer>
 </template>
 

web/app/src/components/UpdateListener.vue

@@ -13,7 +13,7 @@ export default {
     // SocketIO events:
     "sioReconnected", "sioDisconnected"
   ],
-  props: ["websocketURL"],
+  props: ["websocketURL", "subscribedJob"],
   data() {
     return {
       socket: null,
@@ -29,14 +29,31 @@ export default {
   beforeDestroy: function () {
     this.disconnectWebsocket();
   },
+  watch: {
+    subscribedJob(newJob, oldJob) {
+      if (oldJob) {
+        this._updateJobSubscription("unsubscribe", oldJob);
+      }
+      if (newJob) {
+        this._updateJobSubscription("subscribe", newJob);
+      }
+    },
+  },
   methods: {
     connectToWebsocket() {
       // The SocketIO client API docs are available at:
       // https://github.com/socketio/socket.io-client/blob/2.4.x/docs/API.md
       console.log("connecting JobsListener to WS", this.websocketURL);
-      this.socket = io(this.websocketURL, {
+      const ws = io(this.websocketURL, {
         transports: ["websocket"],
       });
+      this.socket = ws;
+
+      // For easy debugging. This assigns `ws` and not `this.socket`, as the
+      // latter is Vue-reactive, which gets in the way of using in the browser
+      // console.
+      window.ws = ws;
+
       this.socket.on('connect_error', (error) => {
         // Don't log the error here, it's too long and noisy for regular logs.
         console.log("socketIO connection error");
@@ -64,6 +81,10 @@ export default {
       });
       this.socket.on("reconnect", (attemptNumber) => {
         console.log("socketIO reconnected after", attemptNumber, "attempts");
+
+        // Resubscribe to whatever we want to be subscribed to:
+        if (this.subscribedJob) this._updateJobSubscription("subscribe", newJob);
+
         this.$emit("sioReconnected", attemptNumber);
       });
 
@@ -74,6 +95,13 @@ export default {
         this.$emit("jobUpdate", apiJobUpdate);
       });
 
+      this.socket.on("/task", (taskUpdate) => {
+        // Convert to API object, in order to have the same parsing of data as
+        // when we'd do an API call.
+        const apiTaskUpdate = API.SocketIOTaskUpdate.constructFromObject(taskUpdate)
+        this.$emit("taskUpdate", apiTaskUpdate);
+      });
+
       // Chat system, useful for debugging.
       this.socket.on("/message", (message) => {
         this.$emit("message", message);
@@ -96,6 +124,12 @@ export default {
       console.log("sending broadcast message:", payload);
       this.socket.emit("/chat", payload);
     },
+
+    _updateJobSubscription(operation, jobID) {
+      const payload = new API.SocketIOSubscription(operation, "job", jobID);
+      console.log("sending job subscription:", payload);
+      this.socket.emit("/subscription", payload);
+    },
   },
 };
 </script>