add server sent events

src/realtime/realtime.route.ts

@@ -0,0 +1,27 @@
+import { FastifyInstance, FastifyReply, FastifyRequest } from "fastify";
+import { ChangeEvent, dbEvents } from "../realtime";
+import { hasValidClaims } from "../auth";
+
+export async function realTimeRoutes(fastify: FastifyInstance) {
+  fastify.get("/events", async (req: FastifyRequest, res: FastifyReply) => {
+    if (!req.user.role) {
+      return res.code(401).send({ error: "not authorized" });
+    }
+
+    res.raw.setHeader("Content-Type", "text/event-stream");
+    res.raw.setHeader("Cache-Control", "no-cache");
+    res.raw.setHeader("Connection", "keep-alive");
+    res.raw.flushHeaders();
+
+    dbEvents.on("change", (event: ChangeEvent) => {
+      if (hasValidClaims(req.user, event.requiredClaims)) {
+        delete event.requiredClaims;
+        res.raw.write(JSON.stringify(event));
+      }
+    });
+
+    req.raw.on("close", () => {
+      res.raw.end();
+    });
+  });
+}