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202 lines
4.9 KiB
Markdown
202 lines
4.9 KiB
Markdown
# ws
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ws module is made to provide helpers to create WebSocket client/server.
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## Usage
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### Server
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```ts
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import { serve } from "https://deno.land/std/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/ws/mod.ts";
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const port = Deno.args[1] || "8080";
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async function main(): Promise<void> {
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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 { headers, conn } = req;
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acceptWebSocket({
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conn,
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headers,
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bufReader: req.r,
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bufWriter: req.w
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})
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.then(
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async (sock: WebSocket): Promise<void> => {
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console.log("socket connected!");
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const it = sock.receive();
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while (true) {
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try {
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const { done, value } = await it.next();
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if (done) {
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break;
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}
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const ev = value;
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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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} catch (e) {
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console.error(`failed to receive frame: ${e}`);
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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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)
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.catch(
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(err: Error): void => {
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console.error(`failed to accept websocket: ${err}`);
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}
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);
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}
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}
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if (import.meta.main) {
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main();
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}
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```
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### Client
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```ts
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import {
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connectWebSocket,
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isWebSocketCloseEvent,
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isWebSocketPingEvent,
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isWebSocketPongEvent
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} from "https://deno.land/std/ws/mod.ts";
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import { encode } from "https://deno.land/std/strings/mod.ts";
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import { BufReader } from "https://deno.land/std/io/bufio.ts";
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import { TextProtoReader } from "https://deno.land/std/textproto/mod.ts";
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import { blue, green, red, yellow } from "https://deno.land/std/fmt/colors.ts";
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const endpoint = Deno.args[1] || "ws://127.0.0.1:8080";
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async function main(): Promise<void> {
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const sock = await connectWebSocket(endpoint);
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console.log(green("ws connected! (type 'close' to quit)"));
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(async function(): Promise<void> {
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for await (const msg of sock.receive()) {
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if (typeof msg === "string") {
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console.log(yellow("< " + msg));
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} else if (isWebSocketPingEvent(msg)) {
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console.log(blue("< ping"));
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} else if (isWebSocketPongEvent(msg)) {
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console.log(blue("< pong"));
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} else if (isWebSocketCloseEvent(msg)) {
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console.log(red(`closed: code=${msg.code}, reason=${msg.reason}`));
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}
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}
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})();
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const tpr = new TextProtoReader(new BufReader(Deno.stdin));
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while (true) {
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await Deno.stdout.write(encode("> "));
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const [line, err] = await tpr.readLine();
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if (err) {
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console.error(red(`failed to read line from stdin: ${err}`));
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break;
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}
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if (line === "close") {
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break;
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} else if (line === "ping") {
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await sock.ping();
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} else {
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await sock.send(line);
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}
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await new Promise((resolve): number => setTimeout(resolve, 0));
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}
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await sock.close(1000);
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Deno.exit(0);
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}
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if (import.meta.main) {
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main();
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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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### append
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This module is used to merge two Uint8Arrays.
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- note: This module might move to common/util.
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```ts
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import { append } from "https://deno.land/std/ws/mod.ts";
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// a = [1], b = [2]
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append(a, b); // output: [1, 2]
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// a = [1], b = null
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append(a, b); // output: [1]
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// a = [], b = [2]
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append(a, b); // output: [2]
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```
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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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### connectWebSocket
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Connect to WebSocket endpoint url with inputted endpoint string and headers.
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- note: Endpoint must be acceptable for URL.
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