add websocket endpoint /api/workout/:id/subscribe.

src/api/workout.js

@@ -174,5 +174,45 @@ module.exports = function workoutRouter(repo) {
     }
   });
 
+  router.ws("/:id/subscribe", (ws, req) => {
+    console.log("HELLO!")
+
+    const workout = workouts.find(w => w.id === req.params.id);
+    if (workout == null) {
+      ws.send(JSON.stringify({error: "workout not found"}));
+      ws.close();
+    }
+
+    workout.listMeasurements().then((list) => {
+      ws.send(JSON.stringify({workoutStatusBackfill: list}));
+    }).catch(err => {
+      ws.send(JSON.stringify({error: `could not list measurements: ${err.message || err}`}));
+      ws.close();
+    });
+
+    const handler = (workotuStatus) => {
+      workotuStatus = {...workotuStatus};
+      delete workotuStatus.id;
+    
+      ws.send(JSON.stringify({workotuStatus}))
+    }
+    
+    workout.events.on("workoutStatus", handler);
+
+    ws.onclose = () => {
+      workout.events.removeListener("workoutStatus", handler);
+      ws.removeAllListeners();
+    };
+
+    ws.send(JSON.stringify({
+      workout: {
+        id: workout.id,
+        bike: workout.bike,
+        program: workout.program,
+        date: workout.date,
+      },
+    }));
+  })
+
   return router;
 }

src/server.js

@@ -1,4 +1,6 @@
-const express = require('express');
+const express = require("express");
+const expressWs = require("express-ws");
+
 const SQLite3Repository = require("./repositories/sqlite3");
 
 const repo = new SQLite3Repository("stuff.db");
@@ -11,6 +13,7 @@ repo.setup().catch(err => {
 });
 
 const app = express();
+expressWs(app);
 
 app.use(express.json({strict: false}));
 

src/systems/workout.js

@@ -85,7 +85,7 @@ class Workout {
 
     this.repo.insertMeasurement({...ws, workoutId: this.id});
 
-    this.events.emit("workoutStatus", ws);
+    this.events.emit("workoutStatus", {...ws});
   }
 
   /**
@@ -95,7 +95,14 @@ class Workout {
    */
   static async create(repo, bikeId, programId) {
     const bike = await repo.findBike(bikeId);
+    if (bike == null) {
+      throw new Error("bike not found");
+    }
     const program = await repo.findProgram(programId);
+    if (program == null) {
+      throw new Error("program not found");
+    }
+
     const date = new Date();
     const id = await repo.insertWorkout({
       bikeId: bike.id,
@@ -115,7 +122,7 @@ class Workout {
     const bike = await repo.findBike(data.bikeId);
     const program = await repo.findWorkout(data.workoutId);
 
-    const workout = new Workout(repo, parseInt(id), bike, program, new Date(data.date));
+    const workout = new Workout(repo, id, bike, program, new Date(data.date));
 
     const list = await repo.listMeasurements(id);
     if (list.length > 0) {