Rewrite SSE endpoint to return map of reservations per event ID

I've changed the method in the controller to use the modified method.

Also changed EventService to return a Record instead of just a number.

Updated tests

server/src/data-layer/services/EventService.test.ts

@@ -246,8 +246,8 @@ describe("EventService integration tests", () => {
       await eventService.addReservation(newEvent.id, reservation1)
       await eventService.addReservation(newEvent.id, reservation2)
 
-      const count = await eventService.getActiveReservationsCount()
-      expect(count).toBe(2)
+      const eventCounts = await eventService.getActiveReservationsCount()
+      expect(eventCounts).toStrictEqual({ [newEvent.id]: 2 })
     })
 
     it("Should get all event reservations", async () => {

server/src/data-layer/services/EventService.ts

@@ -116,18 +116,18 @@ class EventService {
 
   /**
    * Used for the SSE feature to display the total number of active event reservations.
-   * @returns the total number of active event reservations
+   * @returns a record of all the event ids and their event count
    */
-  public async getActiveReservationsCount(): Promise<number> {
+  public async getActiveReservationsCount(): Promise<Record<string, number>> {
     const currentEvents = await this.getActiveEvents()
-    let total = 0
+    const output: Record<string, number> = {}
     await Promise.all(
       currentEvents.map(async (event) => {
         const eventReservations = await this.getAllReservations(event.id)
-        total += eventReservations.length
+        output[`${event.id}`] = eventReservations.length
       })
     )
-    return total
+    return output
   }
 
   /**

server/src/service-layer/controllers/EventController.ts

@@ -119,19 +119,16 @@ export class EventController extends Controller {
     req.res.flushHeaders()
     const eventService = new EventService()
 
-    const signupCount = await eventService.getActiveReservationsCount() // Fetch the current signup count
-    req.res.write(
-      `data: ${JSON.stringify({ reservation_count: signupCount })}\n\n`
-    )
+    const signupRecord: Record<string, number> =
+      await eventService.getActiveReservationsCount() // Fetch the current signup count
+    req.res.write(`data: ${JSON.stringify(signupRecord)}\n\n`)
 
-    // Create something that updates every 5 seconds
     const interValID = setInterval(async () => {
-      const signupCount = await eventService.getActiveReservationsCount() // Fetch the current signup count
+      const signupRecord: Record<string, number> =
+        await eventService.getActiveReservationsCount()
       // NOTE: We use double new line because SSE requires this to indicate we're ready for the next event
       // We also need the data: to indicate data payload
-      req.res.write(
-        `data: ${JSON.stringify({ reservation_count: signupCount })}\n\n`
-      ) // res.write() instead of res.send()
+      req.res.write(`data: ${JSON.stringify(signupRecord)}\n\n`) // res.write() instead of res.send()
     }, 5000)
 
     // If the connection drops, stop sending events