doc: Improved ws example and README (#5636)

1 files changed, 41 insertions, 40 deletions

diff --git a/std/ws/example_server.ts b/std/ws/example_server.ts
index 3a9815957..0d0b28607 100644
--- a/std/ws/example_server.ts
+++ b/std/ws/example_server.ts
@@ -4,54 +4,55 @@ import {
   acceptWebSocket,
   isWebSocketCloseEvent,
   isWebSocketPingEvent,
+  WebSocket,
 } from "./mod.ts";
 
+async function handleWs(sock: WebSocket): Promise<void> {
+  console.log("socket connected!");
+  try {
+    for await (const ev of sock) {
+      if (typeof ev === "string") {
+        // text message
+        console.log("ws:Text", ev);
+        await sock.send(ev);
+      } else if (ev instanceof Uint8Array) {
+        // binary message
+        console.log("ws:Binary", ev);
+      } else if (isWebSocketPingEvent(ev)) {
+        const [, body] = ev;
+        // ping
+        console.log("ws:Ping", body);
+      } else if (isWebSocketCloseEvent(ev)) {
+        // close
+        const { code, reason } = ev;
+        console.log("ws:Close", code, reason);
+      }
+    }
+  } catch (err) {
+    console.error(`failed to receive frame: ${err}`);
+
+    if (!sock.isClosed) {
+      await sock.close(1000).catch(console.error);
+    }
+  }
+}
+
 if (import.meta.main) {
   /** websocket echo server */
   const port = Deno.args[0] || "8080";
   console.log(`websocket server is running on :${port}`);
   for await (const req of serve(`:${port}`)) {
     const { conn, r: bufReader, w: bufWriter, headers } = req;
-
-    try {
-      const sock = await acceptWebSocket({
-        conn,
-        bufReader,
-        bufWriter,
-        headers,
+    acceptWebSocket({
+      conn,
+      bufReader,
+      bufWriter,
+      headers,
+    })
+      .then(handleWs)
+      .catch(async (e) => {
+        console.error(`failed to accept websocket: ${e}`);
+        await req.respond({ status: 400 });
       });
-
-      console.log("socket connected!");
-
-      try {
-        for await (const ev of sock) {
-          if (typeof ev === "string") {
-            // text message
-            console.log("ws:Text", ev);
-            await sock.send(ev);
-          } else if (ev instanceof Uint8Array) {
-            // binary message
-            console.log("ws:Binary", ev);
-          } else if (isWebSocketPingEvent(ev)) {
-            const [, body] = ev;
-            // ping
-            console.log("ws:Ping", body);
-          } else if (isWebSocketCloseEvent(ev)) {
-            // close
-            const { code, reason } = ev;
-            console.log("ws:Close", code, reason);
-          }
-        }
-      } catch (err) {
-        console.error(`failed to receive frame: ${err}`);
-
-        if (!sock.isClosed) {
-          await sock.close(1000).catch(console.error);
-        }
-      }
-    } catch (err) {
-      console.error(`failed to accept websocket: ${err}`);
-      await req.respond({ status: 400 });
-    }
   }
 }