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114 lines
2.7 KiB
Markdown
114 lines
2.7 KiB
Markdown
# ws
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ws module is made to provide helpers to create WebSocket server. For client
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WebSockets, use the
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[WebSocket API](https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API).
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## Usage
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```ts
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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import { serve } from "https://deno.land/std@$STD_VERSION/http/server.ts";
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import {
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acceptWebSocket,
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isWebSocketCloseEvent,
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isWebSocketPingEvent,
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WebSocket,
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} from "https://deno.land/std@$STD_VERSION/ws/mod.ts";
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async function handleWs(sock: WebSocket) {
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console.log("socket connected!");
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try {
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for await (const ev of sock) {
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if (typeof ev === "string") {
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// text message.
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console.log("ws:Text", ev);
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await sock.send(ev);
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} else if (ev instanceof Uint8Array) {
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// binary message.
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console.log("ws:Binary", ev);
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} else if (isWebSocketPingEvent(ev)) {
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const [, body] = ev;
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// ping.
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console.log("ws:Ping", body);
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} else if (isWebSocketCloseEvent(ev)) {
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// close.
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const { code, reason } = ev;
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console.log("ws:Close", code, reason);
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}
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}
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} catch (err) {
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console.error(`failed to receive frame: ${err}`);
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if (!sock.isClosed) {
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await sock.close(1000).catch(console.error);
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}
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}
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}
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if (import.meta.main) {
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/** websocket echo server */
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const port = Deno.args[0] || "8080";
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console.log(`websocket server is running on :${port}`);
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for await (const req of serve(`:${port}`)) {
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const { conn, r: bufReader, w: bufWriter, headers } = req;
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acceptWebSocket({
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conn,
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bufReader,
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bufWriter,
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headers,
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})
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.then(handleWs)
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.catch(async (err) => {
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console.error(`failed to accept websocket: ${err}`);
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await req.respond({ status: 400 });
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});
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}
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}
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```
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## API
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### isWebSocketCloseEvent
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Returns true if input value is a WebSocketCloseEvent, false otherwise.
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### isWebSocketPingEvent
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Returns true if input value is a WebSocketPingEvent, false otherwise.
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### isWebSocketPongEvent
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Returns true if input value is a WebSocketPongEvent, false otherwise.
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### unmask
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Unmask masked WebSocket payload.
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### writeFrame
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Write WebSocket frame to inputted writer.
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### readFrame
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Read WebSocket frame from inputted BufReader.
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### createMask
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Create mask from the client to the server with random 32bit number.
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### acceptable
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Returns true if input headers are usable for WebSocket, otherwise false.
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### createSecAccept
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Create value of Sec-WebSocket-Accept header from inputted nonce.
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### acceptWebSocket
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Upgrade inputted TCP connection into WebSocket connection.
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### createSecKey
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Returns base64 encoded 16 bytes string for Sec-WebSocket-Key header.
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