英文:
Unable to send messages back to the client from the server using Oak websocket middleware in Deno
问题
当使用下面的代码时，客户端永远不会收到echo2消息。第一条消息echo1，在等待之前被客户端接收到。如果我移除await，客户端会接收到两条消息。
我知道await在某种程度上中断了WebSocket。我漏掉了什么？
服务器端代码：
import {Application,Router} from "https://deno.land/x/oak@v12.1.0/mod.ts";const app = new Application();const router = new Router();async function pause(ms) {return new Promise((resolve) => setTimeout(resolve, ms));}router.get("/ws", (ctx) => {console.log("ws connected");if (!ctx.isUpgradable) {ctx.throw(501);}const ws = ctx.upgrade();ws.onopen = () => {ws.send(JSON.stringify({ intent: "init", id: "test" }));};ws.addEventListener("message", async (ev) => {const d = JSON.parse(ev.data);console.log("got message", d);switch (d.intent) {case "echo": {ws.send(JSON.stringify({ intent: "echo1", data: { empty: true } }));await pause(1000);ws.send(JSON.stringify({ intent: "echo2", data: { empty: true } }));break;}}});});
编辑：我使用了一个简单的WS客户端Chrome扩展来测试WebSocket，而不是编写显式代码。
英文:
When using the below code, the echo2 message is never received by the client. The first message, echo1 -- which is prior to the await, is received by the client. If I remove the await, both messages are received by the client.
I know the await is somehow interrupting the websocket. What am I missing?
Server Code:
import {Application,Router} from "https://deno.land/x/oak@v12.1.0/mod.ts";const app = new Application();const router = new Router();async function pause(ms) {return new Promise((resolve) => setTimeout(resolve, ms));}router.get("/ws", (ctx) => {console.log("ws connected");if (!ctx.isUpgradable) {ctx.throw(501);}const ws = ctx.upgrade();ws.onopen = () => {ws.send(JSON.stringify({ intent: "init", id: "test" }));};ws.addEventListener("message", async (ev) => {const d = JSON.parse(ev.data);console.log("got message", d);switch (d.intent) {case "echo": {ws.send(JSON.stringify({ intent: "echo1", data: { empty: true } }));await pause(1000);ws.send(JSON.stringify({ intent: "echo2", data: { empty: true } }));break;}}});});
EDIT: I was using a simple WS client chrome extension to test the websocket, not writing explicit code.
答案1
得分: 0
这个问题在我从 deno 版本 1.32.x 升级到 1.34.3 后自行解决了。
英文:
This issue resolved itself when I upgraded from deno 1.32.x to 1.34.3.
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