mirror of
https://github.com/denoland/deno.git
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553 lines
16 KiB
JavaScript
553 lines
16 KiB
JavaScript
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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// @ts-check
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/// <reference path="../../core/lib.deno_core.d.ts" />
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/// <reference path="../web/internal.d.ts" />
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/// <reference path="../url/internal.d.ts" />
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/// <reference path="../web/lib.deno_web.d.ts" />
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/// <reference path="../web/06_streams_types.d.ts" />
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/// <reference path="./internal.d.ts" />
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/// <reference path="./lib.deno_fetch.d.ts" />
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/// <reference lib="esnext" />
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"use strict";
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((window) => {
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const core = window.Deno.core;
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const webidl = window.__bootstrap.webidl;
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const { errorReadableStream } = window.__bootstrap.streams;
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const { InnerBody, extractBody } = window.__bootstrap.fetchBody;
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const {
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toInnerRequest,
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toInnerResponse,
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fromInnerResponse,
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redirectStatus,
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nullBodyStatus,
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networkError,
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abortedNetworkError,
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} = window.__bootstrap.fetch;
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const abortSignal = window.__bootstrap.abortSignal;
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const { DOMException } = window.__bootstrap.domException;
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const {
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ArrayPrototypePush,
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ArrayPrototypeSplice,
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ArrayPrototypeFilter,
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ArrayPrototypeIncludes,
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Promise,
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PromisePrototypeThen,
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PromisePrototypeCatch,
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String,
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StringPrototypeToLowerCase,
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TypedArrayPrototypeSubarray,
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TypeError,
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Uint8Array,
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WeakMap,
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WeakMapPrototypeDelete,
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WeakMapPrototypeGet,
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WeakMapPrototypeHas,
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WeakMapPrototypeSet,
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} = window.__bootstrap.primordials;
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const REQUEST_BODY_HEADER_NAMES = [
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"content-encoding",
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"content-language",
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"content-location",
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"content-type",
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];
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const requestBodyReaders = new WeakMap();
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/**
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* @param {{ method: string, url: string, headers: [string, string][], clientRid: number | null, hasBody: boolean }} args
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* @param {Uint8Array | null} body
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* @returns {{ requestRid: number, requestBodyRid: number | null }}
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*/
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function opFetch(args, body) {
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return core.opSync("op_fetch", args, body);
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}
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/**
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* @param {number} rid
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* @returns {Promise<{ status: number, statusText: string, headers: [string, string][], url: string, responseRid: number }>}
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*/
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function opFetchSend(rid) {
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return core.opAsync("op_fetch_send", rid);
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}
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/**
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* @param {number} rid
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* @param {Uint8Array} body
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* @returns {Promise<void>}
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*/
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function opFetchRequestWrite(rid, body) {
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return core.opAsync("op_fetch_request_write", rid, body);
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}
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/**
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* @param {number} rid
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* @param {Uint8Array} body
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* @returns {Promise<number>}
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*/
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function opFetchResponseRead(rid, body) {
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return core.opAsync("op_fetch_response_read", rid, body);
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}
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// A finalization registry to clean up underlying fetch resources that are GC'ed.
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const RESOURCE_REGISTRY = new FinalizationRegistry((rid) => {
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core.tryClose(rid);
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});
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/**
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* @param {number} responseBodyRid
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* @param {AbortSignal} [terminator]
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* @returns {ReadableStream<Uint8Array>}
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*/
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function createResponseBodyStream(responseBodyRid, terminator) {
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function onAbort() {
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if (readable) {
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errorReadableStream(
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readable,
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new DOMException("Ongoing fetch was aborted.", "AbortError"),
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);
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}
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core.tryClose(responseBodyRid);
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}
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// TODO(lucacasonato): clean up registration
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terminator[abortSignal.add](onAbort);
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const readable = new ReadableStream({
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type: "bytes",
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async pull(controller) {
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try {
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// This is the largest possible size for a single packet on a TLS
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// stream.
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const chunk = new Uint8Array(16 * 1024 + 256);
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const read = await opFetchResponseRead(
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responseBodyRid,
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chunk,
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);
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if (read > 0) {
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// We read some data. Enqueue it onto the stream.
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controller.enqueue(TypedArrayPrototypeSubarray(chunk, 0, read));
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} else {
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RESOURCE_REGISTRY.unregister(readable);
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// We have reached the end of the body, so we close the stream.
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controller.close();
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core.tryClose(responseBodyRid);
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}
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} catch (err) {
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RESOURCE_REGISTRY.unregister(readable);
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if (terminator.aborted) {
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controller.error(
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new DOMException("Ongoing fetch was aborted.", "AbortError"),
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);
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} else {
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// There was an error while reading a chunk of the body, so we
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// error.
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controller.error(err);
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}
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core.tryClose(responseBodyRid);
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}
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},
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cancel() {
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if (!terminator.aborted) {
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terminator[abortSignal.signalAbort]();
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}
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},
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});
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RESOURCE_REGISTRY.register(readable, responseBodyRid, readable);
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return readable;
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}
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/**
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* @param {InnerRequest} req
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* @param {boolean} recursive
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* @param {AbortSignal} terminator
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* @returns {Promise<InnerResponse>}
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*/
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async function mainFetch(req, recursive, terminator) {
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if (req.blobUrlEntry !== null) {
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if (req.method !== "GET") {
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throw new TypeError("Blob URL fetch only supports GET method.");
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}
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const body = new InnerBody(req.blobUrlEntry.stream());
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terminator[abortSignal.add](() =>
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body.error(new DOMException("Ongoing fetch was aborted.", "AbortError"))
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);
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return {
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headerList: [
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["content-length", String(req.blobUrlEntry.size)],
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["content-type", req.blobUrlEntry.type],
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],
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status: 200,
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statusMessage: "OK",
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body,
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type: "basic",
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url() {
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if (this.urlList.length == 0) return null;
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return this.urlList[this.urlList.length - 1];
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},
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urlList: recursive ? [] : [...req.urlList],
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};
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}
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/** @type {ReadableStream<Uint8Array> | Uint8Array | null} */
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let reqBody = null;
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if (req.body !== null) {
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if (req.body.streamOrStatic instanceof ReadableStream) {
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if (req.body.length === null || req.body.source instanceof Blob) {
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reqBody = req.body.stream;
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} else {
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const reader = req.body.stream.getReader();
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WeakMapPrototypeSet(requestBodyReaders, req, reader);
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const r1 = await reader.read();
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if (r1.done) {
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reqBody = new Uint8Array(0);
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} else {
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reqBody = r1.value;
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const r2 = await reader.read();
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if (!r2.done) throw new TypeError("Unreachable");
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}
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WeakMapPrototypeDelete(requestBodyReaders, req);
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}
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} else {
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req.body.streamOrStatic.consumed = true;
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reqBody = req.body.streamOrStatic.body;
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}
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}
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const { requestRid, requestBodyRid, cancelHandleRid } = opFetch({
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method: req.method,
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url: req.currentUrl(),
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headers: req.headerList,
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clientRid: req.clientRid,
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hasBody: reqBody !== null,
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bodyLength: req.body?.length,
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}, reqBody instanceof Uint8Array ? reqBody : null);
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function onAbort() {
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if (cancelHandleRid !== null) {
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core.tryClose(cancelHandleRid);
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}
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if (requestBodyRid !== null) {
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core.tryClose(requestBodyRid);
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}
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}
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terminator[abortSignal.add](onAbort);
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if (requestBodyRid !== null) {
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if (reqBody === null || !(reqBody instanceof ReadableStream)) {
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throw new TypeError("Unreachable");
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}
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const reader = reqBody.getReader();
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WeakMapPrototypeSet(requestBodyReaders, req, reader);
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(async () => {
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while (true) {
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const { value, done } = await PromisePrototypeCatch(
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reader.read(),
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(err) => {
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if (terminator.aborted) return { done: true, value: undefined };
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throw err;
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},
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);
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if (done) break;
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if (!(value instanceof Uint8Array)) {
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await reader.cancel("value not a Uint8Array");
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break;
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}
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try {
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await PromisePrototypeCatch(
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opFetchRequestWrite(requestBodyRid, value),
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(err) => {
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if (terminator.aborted) return;
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throw err;
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},
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);
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if (terminator.aborted) break;
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} catch (err) {
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await reader.cancel(err);
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break;
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}
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}
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WeakMapPrototypeDelete(requestBodyReaders, req);
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core.tryClose(requestBodyRid);
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})();
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}
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let resp;
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try {
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resp = await PromisePrototypeCatch(opFetchSend(requestRid), (err) => {
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if (terminator.aborted) return;
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throw err;
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});
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} finally {
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if (cancelHandleRid !== null) {
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core.tryClose(cancelHandleRid);
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}
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}
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if (terminator.aborted) return abortedNetworkError();
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/** @type {InnerResponse} */
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const response = {
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headerList: resp.headers,
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status: resp.status,
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body: null,
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statusMessage: resp.statusText,
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type: "basic",
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url() {
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if (this.urlList.length == 0) return null;
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return this.urlList[this.urlList.length - 1];
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},
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urlList: req.urlList,
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};
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if (redirectStatus(resp.status)) {
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switch (req.redirectMode) {
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case "error":
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core.close(resp.responseRid);
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return networkError(
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"Encountered redirect while redirect mode is set to 'error'",
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);
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case "follow":
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core.close(resp.responseRid);
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return httpRedirectFetch(req, response, terminator);
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case "manual":
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break;
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}
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}
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if (nullBodyStatus(response.status)) {
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core.close(resp.responseRid);
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} else {
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if (req.method === "HEAD" || req.method === "CONNECT") {
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response.body = null;
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core.close(resp.responseRid);
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} else {
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response.body = new InnerBody(
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createResponseBodyStream(resp.responseRid, terminator),
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);
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}
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}
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if (recursive) return response;
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if (response.urlList.length === 0) {
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response.urlList = [...req.urlList];
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}
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return response;
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}
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/**
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* @param {InnerRequest} request
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* @param {InnerResponse} response
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* @returns {Promise<InnerResponse>}
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*/
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function httpRedirectFetch(request, response, terminator) {
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const locationHeaders = ArrayPrototypeFilter(
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response.headerList,
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(entry) => entry[0] === "location",
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);
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if (locationHeaders.length === 0) {
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return response;
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}
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const locationURL = new URL(
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locationHeaders[0][1],
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response.url() ?? undefined,
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);
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if (locationURL.hash === "") {
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locationURL.hash = request.currentUrl().hash;
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}
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if (locationURL.protocol !== "https:" && locationURL.protocol !== "http:") {
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return networkError("Can not redirect to a non HTTP(s) url");
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}
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if (request.redirectCount === 20) {
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return networkError("Maximum number of redirects (20) reached");
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}
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request.redirectCount++;
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if (
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response.status !== 303 &&
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request.body !== null &&
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request.body.source === null
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) {
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return networkError(
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"Can not redeliver a streaming request body after a redirect",
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);
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}
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if (
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((response.status === 301 || response.status === 302) &&
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request.method === "POST") ||
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(response.status === 303 &&
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request.method !== "GET" &&
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request.method !== "HEAD")
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) {
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request.method = "GET";
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request.body = null;
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for (let i = 0; i < request.headerList.length; i++) {
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if (
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ArrayPrototypeIncludes(
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REQUEST_BODY_HEADER_NAMES,
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request.headerList[i][0],
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)
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) {
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ArrayPrototypeSplice(request.headerList, i, 1);
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i--;
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}
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}
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}
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if (request.body !== null) {
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const res = extractBody(request.body.source);
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request.body = res.body;
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}
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ArrayPrototypePush(request.urlList, locationURL.href);
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return mainFetch(request, true, terminator);
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}
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/**
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* @param {RequestInfo} input
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* @param {RequestInit} init
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*/
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function fetch(input, init = {}) {
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// 1.
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const p = new Promise((resolve, reject) => {
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const prefix = "Failed to call 'fetch'";
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webidl.requiredArguments(arguments.length, 1, { prefix });
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// 2.
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const requestObject = new Request(input, init);
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// 3.
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const request = toInnerRequest(requestObject);
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// 4.
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if (requestObject.signal.aborted) {
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reject(abortFetch(request, null));
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return;
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}
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// 7.
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let responseObject = null;
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// 9.
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let locallyAborted = false;
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// 10.
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function onabort() {
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locallyAborted = true;
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reject(abortFetch(request, responseObject));
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}
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requestObject.signal[abortSignal.add](onabort);
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if (!requestObject.headers.has("accept")) {
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ArrayPrototypePush(request.headerList, ["accept", "*/*"]);
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}
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// 12.
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PromisePrototypeCatch(
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PromisePrototypeThen(
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mainFetch(request, false, requestObject.signal),
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(response) => {
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// 12.1.
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if (locallyAborted) return;
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// 12.2.
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if (response.aborted) {
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reject(request, responseObject);
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requestObject.signal[abortSignal.remove](onabort);
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return;
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}
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// 12.3.
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if (response.type === "error") {
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const err = new TypeError(
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"Fetch failed: " + (response.error ?? "unknown error"),
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);
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reject(err);
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requestObject.signal[abortSignal.remove](onabort);
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return;
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}
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responseObject = fromInnerResponse(response, "immutable");
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resolve(responseObject);
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requestObject.signal[abortSignal.remove](onabort);
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},
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),
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(err) => {
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reject(err);
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requestObject.signal[abortSignal.remove](onabort);
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},
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);
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});
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return p;
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}
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function abortFetch(request, responseObject) {
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const error = new DOMException("Ongoing fetch was aborted.", "AbortError");
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if (request.body !== null) {
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if (WeakMapPrototypeHas(requestBodyReaders, request)) {
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WeakMapPrototypeGet(requestBodyReaders, request).cancel(error);
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} else {
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request.body.cancel(error);
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}
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}
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if (responseObject !== null) {
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const response = toInnerResponse(responseObject);
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if (response.body !== null) response.body.error(error);
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}
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return error;
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}
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/**
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* Handle the Promise<Response> argument to the WebAssembly streaming
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* APIs. This function should be registered through
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* `Deno.core.setWasmStreamingCallback`.
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*
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* @param {any} source The source parameter that the WebAssembly
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* streaming API was called with.
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* @param {number} rid An rid that represents the wasm streaming
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* resource.
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*/
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function handleWasmStreaming(source, rid) {
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// This implements part of
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// https://webassembly.github.io/spec/web-api/#compile-a-potential-webassembly-response
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(async () => {
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try {
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const res = webidl.converters["Response"](await source, {
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prefix: "Failed to call 'WebAssembly.compileStreaming'",
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context: "Argument 1",
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});
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// 2.3.
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// The spec is ambiguous here, see
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// https://github.com/WebAssembly/spec/issues/1138. The WPT tests
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// expect the raw value of the Content-Type attribute lowercased.
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const contentType = res.headers.get("Content-Type");
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if (
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typeof contentType !== "string" ||
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StringPrototypeToLowerCase(contentType) !== "application/wasm"
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) {
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throw new TypeError("Invalid WebAssembly content type.");
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}
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// 2.5.
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if (!res.ok) {
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throw new TypeError(`HTTP status code ${res.status}`);
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}
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// 2.6.
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// Rather than consuming the body as an ArrayBuffer, this passes each
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// chunk to the feed as soon as it's available.
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if (res.body !== null) {
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const reader = res.body.getReader();
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while (true) {
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const { value: chunk, done } = await reader.read();
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if (done) break;
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core.opSync("op_wasm_streaming_feed", rid, chunk);
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}
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}
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// 2.7.
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core.close(rid);
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} catch (err) {
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// 2.8 and 3
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core.opSync("op_wasm_streaming_abort", rid, err);
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}
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})();
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}
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window.__bootstrap.fetch ??= {};
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window.__bootstrap.fetch.fetch = fetch;
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window.__bootstrap.fetch.handleWasmStreaming = handleWasmStreaming;
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})(this);
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