Budget chat
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parent
23b1dbeb82
commit
6ca0cc6a22
158
main.ts
158
main.ts
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@ -1,72 +1,108 @@
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import { BufReader } from "https://deno.land/std@0.157.0/io/buffer.ts";
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import { ByteSet } from "https://deno.land/x/bytes@1.0.3/mod.ts";
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import { readLines } from "https://deno.land/std@0.157.0/io/buffer.ts";
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const QUERY_SIZE = 9;
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const PORT = 5588;
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console.log(`Starting TCP listener on on 0.0.0.0:${PORT}`);
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const listener = Deno.listen({ port: 5588 });
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const clients = new Map<Deno.Conn, string>();
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console.log(`Listening on 0.0.0.0:${PORT}`);
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const tEnc = new TextEncoder();
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for await (const conn of listener) {
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async function chatSession(conn: Deno.Conn) {
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try {
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let myNick: string | null = null;
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await sendPrompt(conn);
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for await (const line of readLines(conn)) {
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console.debug("Received line:", line);
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const message = line.trim();
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if (myNick == null) {
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if (isLegalNick(message)) {
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myNick = message;
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await join(myNick, conn);
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} else {
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console.error("Illegal nick:", message);
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break;
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}
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} else {
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const conns: Deno.Conn[] = [];
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for (const themConn of clients.keys()) {
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if (themConn != conn) conns.push(themConn);
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}
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await send(conns, `[${myNick}] ${message}`);
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}
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}
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} finally {
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if (clients.has(conn)) {
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try {
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await disconnect(conn);
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} catch (err) {
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console.error("Failed to disconnect:", err);
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}
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}
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try {
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if (conn.writable) {
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send(conn, "You are being disconnected...");
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}
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} catch (err) {
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console.error("Failed to send disconnect notice:", err);
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}
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}
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try {
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conn.close();
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} catch (err) {
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console.error("Failed to close connection:", err);
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}
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}
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async function send(
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connsArg: Deno.Conn | Array<Deno.Conn>,
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text: string,
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) {
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const conns = !Array.isArray(connsArg) ? [connsArg] : connsArg;
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const messages: Promise<number>[] = [];
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const bytes = tEnc.encode(text + "\n");
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conns.forEach((conn) => messages.push(conn.write(bytes)));
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return await Promise.all(messages);
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}
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const broadcast = async (text: string) => await send([...clients.keys()], text);
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const LEGAL_NICK_REGEXP = /^[a-z0-9]+$/i;
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const isLegalNick = (nick: string) => {
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console.debug(
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`Checking nick: ${nick} (Bytes: ${tEnc.encode(nick)})`,
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);
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return LEGAL_NICK_REGEXP.exec(nick) != null;
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};
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const sendPrompt = async (conn: Deno.Conn) => {
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console.debug("Sending prompt...");
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return await send(conn, "Who you be?");
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};
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async function join(myNick: string, conn: Deno.Conn) {
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const userList: string[] = [];
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clients.forEach((nick, _) => userList.push(nick));
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await broadcast(`* ${myNick} joined`);
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clients.set(conn, myNick);
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await send(conn, `* users: ${userList.join(", ")}`);
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}
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async function disconnect(conn: Deno.Conn) {
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const myNick = clients.get(conn);
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clients.delete(conn);
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await broadcast(`* ${myNick} left`);
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}
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for await (const conn of Deno.listen({ port: PORT })) {
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console.log("Connection established:", conn.remoteAddr);
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try {
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meansToAnEnd(conn);
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chatSession(conn);
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} catch (e) {
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console.error(conn.remoteAddr, e);
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console.error(
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"Exception occurred during chat session:",
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conn.remoteAddr,
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e,
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);
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}
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console.log("Connection closed:", conn.remoteAddr);
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}
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// problem 2
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async function meansToAnEnd(conn: Deno.Conn) {
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try {
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const prices = [];
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for await (const query of queries(conn)) {
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if (query == null) break;
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const bs = ByteSet.from(query, "big");
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const queryChar = String.fromCharCode(bs.read.uint8());
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const a1 = bs.read.int32();
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const a2 = bs.read.int32();
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if (queryChar == "I") {
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prices.push([a1, a2]);
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} else if (queryChar == "Q") {
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let numMatches = 0;
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let sum = 0;
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for (const [ts, price] of prices) {
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if (ts < a1 || ts > a2) continue;
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numMatches++;
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sum += price;
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}
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let result = Math.floor(sum / numMatches);
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if (isNaN(result)) result = 0;
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console.log(
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conn.remoteAddr,
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`Result for ${prices.length} prices: ${sum} / ${numMatches} = ${result}`,
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);
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const response = new ByteSet(4, "big");
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response.write.int32(result);
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conn.write(response.buffer);
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}
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}
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console.log("Done!");
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} catch (err) {
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console.error("Error processing query:", err);
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}
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}
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function queries(conn: Deno.Conn) {
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return {
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async *[Symbol.asyncIterator]() {
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const b = new Uint8Array(9);
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const reader = new BufReader(conn, QUERY_SIZE);
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try {
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while (await reader.readFull(b) != null) {
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yield b;
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}
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} catch (err) {
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console.error("Error receiving query:", err);
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}
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},
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};
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}
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