/
server.ts
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/
server.ts
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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import { encode } from "../encoding/utf8.ts";
import { BufReader, BufWriter } from "../io/bufio.ts";
import { assert } from "../_util/assert.ts";
import { deferred, Deferred, MuxAsyncIterator } from "../async/mod.ts";
import {
bodyReader,
chunkedBodyReader,
emptyReader,
writeResponse,
readRequest,
} from "./_io.ts";
export class ServerRequest {
url!: string;
method!: string;
proto!: string;
protoMinor!: number;
protoMajor!: number;
headers!: Headers;
conn!: Deno.Conn;
r!: BufReader;
w!: BufWriter;
done: Deferred<Error | undefined> = deferred();
private _contentLength: number | undefined | null = undefined;
/**
* Value of Content-Length header.
* If null, then content length is invalid or not given (e.g. chunked encoding).
*/
get contentLength(): number | null {
// undefined means not cached.
// null means invalid or not provided.
if (this._contentLength === undefined) {
const cl = this.headers.get("content-length");
if (cl) {
this._contentLength = parseInt(cl);
// Convert NaN to null (as NaN harder to test)
if (Number.isNaN(this._contentLength)) {
this._contentLength = null;
}
} else {
this._contentLength = null;
}
}
return this._contentLength;
}
private _body: Deno.Reader | null = null;
/**
* Body of the request. The easiest way to consume the body is:
*
* const buf: Uint8Array = await Deno.readAll(req.body);
*/
get body(): Deno.Reader {
if (!this._body) {
if (this.contentLength != null) {
this._body = bodyReader(this.contentLength, this.r);
} else {
const transferEncoding = this.headers.get("transfer-encoding");
if (transferEncoding != null) {
const parts = transferEncoding
.split(",")
.map((e): string => e.trim().toLowerCase());
assert(
parts.includes("chunked"),
'transfer-encoding must include "chunked" if content-length is not set',
);
this._body = chunkedBodyReader(this.headers, this.r);
} else {
// Neither content-length nor transfer-encoding: chunked
this._body = emptyReader();
}
}
}
return this._body;
}
async respond(r: Response): Promise<void> {
let err: Error | undefined;
try {
// Write our response!
await writeResponse(this.w, r);
} catch (e) {
try {
// Eagerly close on error.
this.conn.close();
} catch {
// Pass
}
err = e;
}
// Signal that this request has been processed and the next pipelined
// request on the same connection can be accepted.
this.done.resolve(err);
if (err) {
// Error during responding, rethrow.
throw err;
}
}
private finalized = false;
async finalize(): Promise<void> {
if (this.finalized) return;
// Consume unread body
const body = this.body;
const buf = new Uint8Array(1024);
while ((await body.read(buf)) !== null) {
// Pass
}
this.finalized = true;
}
}
export class Server implements AsyncIterable<ServerRequest> {
private closing = false;
private connections: Deno.Conn[] = [];
constructor(public listener: Deno.Listener) {}
close(): void {
this.closing = true;
this.listener.close();
for (const conn of this.connections) {
try {
conn.close();
} catch (e) {
// Connection might have been already closed
if (!(e instanceof Deno.errors.BadResource)) {
throw e;
}
}
}
}
// Yields all HTTP requests on a single TCP connection.
private async *iterateHttpRequests(
conn: Deno.Conn,
): AsyncIterableIterator<ServerRequest> {
const reader = new BufReader(conn);
const writer = new BufWriter(conn);
while (!this.closing) {
let request: ServerRequest | null;
try {
request = await readRequest(conn, reader);
} catch (error) {
if (
error instanceof Deno.errors.InvalidData ||
error instanceof Deno.errors.UnexpectedEof
) {
// An error was thrown while parsing request headers.
await writeResponse(writer, {
status: 400,
body: encode(`${error.message}\r\n\r\n`),
});
}
break;
}
if (request === null) {
break;
}
request.w = writer;
yield request;
// Wait for the request to be processed before we accept a new request on
// this connection.
const responseError = await request.done;
if (responseError) {
// Something bad happened during response.
// (likely other side closed during pipelined req)
// req.done implies this connection already closed, so we can just return.
this.untrackConnection(request.conn);
return;
}
// Consume unread body and trailers if receiver didn't consume those data
await request.finalize();
}
this.untrackConnection(conn);
try {
conn.close();
} catch (e) {
// might have been already closed
}
}
private trackConnection(conn: Deno.Conn): void {
this.connections.push(conn);
}
private untrackConnection(conn: Deno.Conn): void {
const index = this.connections.indexOf(conn);
if (index !== -1) {
this.connections.splice(index, 1);
}
}
// Accepts a new TCP connection and yields all HTTP requests that arrive on
// it. When a connection is accepted, it also creates a new iterator of the
// same kind and adds it to the request multiplexer so that another TCP
// connection can be accepted.
private async *acceptConnAndIterateHttpRequests(
mux: MuxAsyncIterator<ServerRequest>,
): AsyncIterableIterator<ServerRequest> {
if (this.closing) return;
// Wait for a new connection.
let conn: Deno.Conn;
try {
conn = await this.listener.accept();
} catch (error) {
if (
error instanceof Deno.errors.BadResource ||
error instanceof Deno.errors.InvalidData ||
error instanceof Deno.errors.UnexpectedEof
) {
return mux.add(this.acceptConnAndIterateHttpRequests(mux));
}
throw error;
}
this.trackConnection(conn);
// Try to accept another connection and add it to the multiplexer.
mux.add(this.acceptConnAndIterateHttpRequests(mux));
// Yield the requests that arrive on the just-accepted connection.
yield* this.iterateHttpRequests(conn);
}
[Symbol.asyncIterator](): AsyncIterableIterator<ServerRequest> {
const mux: MuxAsyncIterator<ServerRequest> = new MuxAsyncIterator();
mux.add(this.acceptConnAndIterateHttpRequests(mux));
return mux.iterate();
}
}
/** Options for creating an HTTP server. */
export type HTTPOptions = Omit<Deno.ListenOptions, "transport">;
/**
* Parse addr from string
*
* const addr = "::1:8000";
* parseAddrFromString(addr);
*
* @param addr Address string
*/
export function _parseAddrFromStr(addr: string): HTTPOptions {
let url: URL;
try {
const host = addr.startsWith(":") ? `0.0.0.0${addr}` : addr;
url = new URL(`http://${host}`);
} catch {
throw new TypeError("Invalid address.");
}
if (
url.username ||
url.password ||
url.pathname != "/" ||
url.search ||
url.hash
) {
throw new TypeError("Invalid address.");
}
return {
hostname: url.hostname,
port: url.port === "" ? 80 : Number(url.port),
};
}
/**
* Create a HTTP server
*
* import { serve } from "https://deno.land/std/http/server.ts";
* const body = "Hello World\n";
* const server = serve({ port: 8000 });
* for await (const req of server) {
* req.respond({ body });
* }
*/
export function serve(addr: string | HTTPOptions): Server {
if (typeof addr === "string") {
addr = _parseAddrFromStr(addr);
}
const listener = Deno.listen(addr);
return new Server(listener);
}
/**
* Start an HTTP server with given options and request handler
*
* const body = "Hello World\n";
* const options = { port: 8000 };
* listenAndServe(options, (req) => {
* req.respond({ body });
* });
*
* @param options Server configuration
* @param handler Request handler
*/
export async function listenAndServe(
addr: string | HTTPOptions,
handler: (req: ServerRequest) => void,
): Promise<void> {
const server = serve(addr);
for await (const request of server) {
handler(request);
}
}
/** Options for creating an HTTPS server. */
export type HTTPSOptions = Omit<Deno.ListenTlsOptions, "transport">;
/**
* Create an HTTPS server with given options
*
* const body = "Hello HTTPS";
* const options = {
* hostname: "localhost",
* port: 443,
* certFile: "./path/to/localhost.crt",
* keyFile: "./path/to/localhost.key",
* };
* for await (const req of serveTLS(options)) {
* req.respond({ body });
* }
*
* @param options Server configuration
* @return Async iterable server instance for incoming requests
*/
export function serveTLS(options: HTTPSOptions): Server {
const tlsOptions: Deno.ListenTlsOptions = {
...options,
transport: "tcp",
};
const listener = Deno.listenTls(tlsOptions);
return new Server(listener);
}
/**
* Start an HTTPS server with given options and request handler
*
* const body = "Hello HTTPS";
* const options = {
* hostname: "localhost",
* port: 443,
* certFile: "./path/to/localhost.crt",
* keyFile: "./path/to/localhost.key",
* };
* listenAndServeTLS(options, (req) => {
* req.respond({ body });
* });
*
* @param options Server configuration
* @param handler Request handler
*/
export async function listenAndServeTLS(
options: HTTPSOptions,
handler: (req: ServerRequest) => void,
): Promise<void> {
const server = serveTLS(options);
for await (const request of server) {
handler(request);
}
}
/**
* Interface of HTTP server response.
* If body is a Reader, response would be chunked.
* If body is a string, it would be UTF-8 encoded by default.
*/
export interface Response {
status?: number;
headers?: Headers;
body?: Uint8Array | Deno.Reader | string;
trailers?: () => Promise<Headers> | Headers;
}