Update

routes/api/task.ts

@@ -0,0 +1,37 @@
+import { Handlers } from "$fresh/server.ts";
+import { get_task_manager } from "../../server.ts";
+import { Task } from "../../task.ts";
+
+export const handler: Handlers<Task[]> = {
+    GET(req, _ctx) {
+        const t = get_task_manager();
+        const { socket, response } = Deno.upgradeWebSocket(req);
+        const new_task_handle = (e: CustomEvent<Task>) => {
+            socket.send(JSON.stringify({ type: "new_task", detail: e.detail }));
+        };
+        const removeListener = () => {
+            t.removeEventListener("new_task", new_task_handle);
+        };
+        socket.onclose = () => {
+            removeListener();
+        };
+        socket.onerror = () => {
+            removeListener();
+            console.error("WebSocket error.");
+        };
+        socket.onmessage = (e) => {
+            try {
+                const d = JSON.parse(e.data);
+                if (d.type == "close") {
+                    socket.close();
+                }
+            } catch (_) {
+                null;
+            }
+        };
+        socket.onopen = () => {
+            t.addEventListener("new_task", new_task_handle);
+        };
+        return response;
+    },
+};