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server.ts
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server.ts
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// Copyright 2019 Yusuke Sakurai. All rights reserved. MIT license.
import listen = Deno.listen;
import Conn = Deno.Conn;
import Reader = Deno.Reader;
import {
BufReader,
BufWriter
} from "https://deno.land/std@v0.12.0/io/bufio.ts";
import { defer, Deferred, promiseInterrupter } from "./promises.ts";
import { initServeOptions, readRequest } from "./serveio.ts";
import { createResponder, ServerResponder } from "./responder.ts";
/** request data for building http request to server */
export type ClientRequest = {
/** full request url with queries */
url: string;
/** HTTP method */
method: string;
/** HTTP Headers */
headers?: Headers;
/** HTTP Body */
body?: Uint8Array | Reader;
};
/** response data for building http response to client */
export type ServerResponse = {
/** HTTP status code */
status: number;
/** HTTP headers */
headers?: Headers;
/** HTTP body */
body?: Uint8Array | Reader;
};
/** Incoming http request for handling request from client */
export type IncomingHttpRequest = {
/** request path with queries. always begin with / */
url: string;
/** HTTP method */
method: string;
/** requested protocol. like HTTP/1.1 */
proto: string;
/** HTTP Headers */
headers: Headers;
/** HTTP Body */
body?: Reader;
/** Trailer headers. Note that it won't be assigned until finalizer will be called */
trailers?: Headers;
/** keep-alive info */
keepAlive?: KeepAlive;
/** Request finalizer. Consume all body and trailers */
finalize: () => Promise<void>;
};
export type KeepAlive = {
timeout: number;
max: number;
};
/** Outgoing http response for building request to server */
export type ServerRequest = IncomingHttpRequest & {
conn: Conn;
bufWriter: BufWriter;
bufReader: BufReader;
} & ServerResponder;
/** Incoming http response for receiving from server */
export type IncomingHttpResponse = {
/** requested protocol. like HTTP/1.1 */
proto: string;
/** request path with queries. always begin with / */
status: number;
/** status text. like OK */
statusText: string;
/** HTTP Headers */
headers: Headers;
/** HTTP Body */
body?: Reader;
/** trailer headers. Note that it won't be assigned until finalizer will be called */
trailers?: Headers;
/** Request finalizer. Consume all body and trailers */
finalize: () => Promise<void>;
};
export type ClientResponse = IncomingHttpResponse & {
conn: Conn;
bufWriter: BufWriter;
bufReader: BufReader;
};
/** serve options */
export type ServeOptions = {
/** canceller promise for async iteration. use defer() */
cancel?: Promise<void>;
/** read timeout for keep-alive connection. ms. default=75000(ms) */
keepAliveTimeout?: number;
/** read timeout for all read request. ms. default=75000(ms) */
readTimeout?: number;
};
export async function* serve(
addr: string,
opts: ServeOptions = {}
): AsyncIterableIterator<ServerRequest> {
opts = initServeOptions(opts);
const listener = listen("tcp", addr);
let onRequestDeferred = defer();
let requestQueue: ServerRequest[] = [];
const yieldingPromises: WeakMap<ServerRequest, Deferred> = new WeakMap();
const throwIfCancelled = promiseInterrupter({
cancel: opts.cancel
});
const enqueueRequest = (req: ServerRequest): Promise<void> => {
requestQueue.push(req);
const d = defer();
yieldingPromises.set(req, d);
onRequestDeferred.resolve();
return d.promise;
};
let closed = false;
const closeListener = () => {
if (!closed) {
listener.close();
closed = true;
}
};
// start accept routine
// it continually accept new tcp socket
const acceptRoutine = () => {
if (closed) return;
listener
.accept()
.then(conn => {
handleKeepAliveConn(conn, enqueueRequest, opts);
acceptRoutine();
})
.catch(closeListener);
};
acceptRoutine();
while (true) {
try {
// break loop if canceller is called
await throwIfCancelled(onRequestDeferred.promise);
onRequestDeferred = defer();
const list = requestQueue;
requestQueue = [];
for (const req of list) {
const d = yieldingPromises.get(req);
try {
yield req;
d.resolve();
} catch (e) {
d.reject();
} finally {
yieldingPromises.delete(req);
}
}
} catch (unused) {
break;
}
}
closeListener();
}
export function listenAndServe(
addr: string,
handler: (req: ServerRequest) => Promise<void>,
opts: ServeOptions = {}
): void {
opts = initServeOptions(opts);
const listener = listen("tcp", addr);
const throwIfCancelled = promiseInterrupter({
cancel: opts.cancel
});
let closed = false;
const closeListener = () => {
if (!closed) {
listener.close();
closed = true;
}
};
const acceptRoutine = () => {
if (closed) return;
throwIfCancelled(listener.accept())
.then(conn => {
handleKeepAliveConn(conn, handler, opts);
acceptRoutine();
})
.catch(closeListener);
};
acceptRoutine();
}
/** Try to continually read and process requests from keep-alive connection. */
function handleKeepAliveConn(
conn: Conn,
handler: (req: ServerRequest) => Promise<void>,
opts: ServeOptions = {}
) {
const bufReader = new BufReader(conn);
const bufWriter = new BufWriter(conn);
const originalOpts = opts;
// ignore keepAliveTimeout and use readTimeout for the first time
scheduleReadRequest({
keepAliveTimeout: opts.readTimeout,
readTimeout: opts.readTimeout,
cancel: opts.cancel
});
function scheduleReadRequest(opts: ServeOptions) {
processRequest(opts)
.then(scheduleReadRequest)
.catch(() => conn.close());
}
async function processRequest(opts: ServeOptions): Promise<ServeOptions> {
const req = await readRequest(bufReader, opts);
const nextReq = Object.assign(
req,
{
bufWriter,
bufReader,
conn
},
createResponder(bufWriter)
);
await handler(nextReq);
await req.finalize();
let keepAliveTimeout = originalOpts.keepAliveTimeout;
if (req.keepAlive && req.keepAlive.max <= 0) {
throw "EOF";
}
if (req.headers.get("connection") === "close") {
throw "EOF";
}
if (req.keepAlive && Number.isInteger(req.keepAlive.timeout)) {
keepAliveTimeout = Math.min(
keepAliveTimeout,
req.keepAlive.timeout * 1000
);
}
return {
keepAliveTimeout,
readTimeout: opts.readTimeout,
cancel: opts.cancel
};
}
}