70 lines
1.9 KiB
TypeScript
70 lines
1.9 KiB
TypeScript
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import { JsonParseStream } from "https://deno.land/std@0.157.0/encoding/json/stream.ts";
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import { TextLineStream } from "https://deno.land/std@0.156.0/streams/delimiter.ts";
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const PORT = 5588;
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const tEnc = new TextEncoder();
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console.log(`Listening on port ${PORT}`);
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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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for await (const request of requests(conn)) {
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console.debug("Request:", request);
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if (
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request == null || typeof request != "object" ||
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!("method" in request) || !("number" in request)
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) {
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throw "Invalid request";
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}
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if (
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request.method == "isPrime" &&
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typeof request.number == "number"
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) {
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const response = {
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method: "isPrime",
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prime: isPrime(request.number),
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};
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console.debug("Response:", response);
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await conn.write(tEnc.encode(JSON.stringify(response) + "\n"));
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} else {
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console.debug("Request malformed");
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await conn.write(tEnc.encode("Malformed!\n"));
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}
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}
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} catch (e) {
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console.error(conn.remoteAddr, e);
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} finally {
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console.log("Connection closed:", conn.remoteAddr);
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try {
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conn.close();
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} catch (_err) {
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// connection already closed
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}
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}
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}
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function isPrime(n: number) {
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if (!Number.isInteger(n)) return false;
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for (let i = 2, s = Math.sqrt(n); i <= s; i++) if (n % i === 0) return false;
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return n > 1;
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}
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function requests(conn: Deno.Conn) {
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try {
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const readable = conn.readable
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.pipeThrough(new TextDecoderStream())
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.pipeThrough(new TextLineStream())
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.pipeThrough(new JsonParseStream());
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return {
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async *[Symbol.asyncIterator]() {
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for await (const data of readable) {
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yield data;
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}
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},
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};
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} catch (err) {
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console.error(err);
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}
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}
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