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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
"use strict";
((window) => {
const { Request, dontValidateUrl, fastBody, Response } =
window.__bootstrap.fetch;
const { Headers } = window.__bootstrap.headers;
const errors = window.__bootstrap.errors.errors;
const core = window.Deno.core;
const { ReadableStream } = window.__bootstrap.streams;
function flatEntries(obj) {
const entries = [];
for (const key in obj) {
entries.push(key);
entries.push(obj[key]);
}
return entries;
}
function startHttp(conn) {
const rid = Deno.core.jsonOpSync("op_http_start", conn.rid);
return new HttpConn(rid);
}
class HttpConn {
#rid = 0;
constructor(rid) {
this.#rid = rid;
}
/** @returns {number} */
get rid() {
return this.#rid;
}
/** @returns {Promise<ResponseEvent | null>} */
async nextRequest() {
let nextRequest;
try {
nextRequest = await Deno.core.jsonOpAsync(
"op_http_request_next",
this.#rid,
);
} catch (error) {
if (error instanceof errors.BadResource) {
return null;
} else if (error instanceof errors.Interrupted) {
return null;
}
throw error;
}
if (nextRequest === null) return null;
const [
requestBodyRid,
responseSenderRid,
method,
headersList,
url,
] = nextRequest;
/** @type {ReadableStream<Uint8Array> | undefined} */
let body = undefined;
if (typeof requestBodyRid === "number") {
body = createRequestBodyStream(requestBodyRid);
}
const request = new Request(url, {
body,
method,
headers: new Headers(headersList),
[dontValidateUrl]: true,
});
const respondWith = createRespondWith(responseSenderRid, this.#rid);
return { request, respondWith };
}
/** @returns {void} */
close() {
core.close(this.#rid);
}
[Symbol.asyncIterator]() {
const httpConn = this;
return {
async next() {
const reqEvt = await httpConn.nextRequest();
if (reqEvt === null) return { value: undefined, done: true };
return { value: reqEvt, done: false };
},
};
}
}
function readRequest(requestRid, zeroCopyBuf) {
return Deno.core.jsonOpAsync(
"op_http_request_read",
requestRid,
zeroCopyBuf,
);
}
function respond(responseSenderRid, resp, zeroCopyBuf) {
return Deno.core.jsonOpSync("op_http_response", [
responseSenderRid,
resp.status ?? 200,
flatEntries(resp.headers ?? {}),
], zeroCopyBuf);
}
function createRespondWith(responseSenderRid, connRid) {
return async function (resp) {
if (resp instanceof Promise) {
resp = await resp;
}
if (!(resp instanceof Response)) {
throw new TypeError(
"First argument to respondWith must be a Response or a promise resolving to a Response.",
);
}
// If response body is Uint8Array it will be sent synchronously
// in a single op, in other case a "response body" resource will be
// created and we'll be streaming it.
const body = resp[fastBody]();
let zeroCopyBuf;
if (body instanceof ArrayBuffer) {
zeroCopyBuf = new Uint8Array(body);
} else if (!body) {
zeroCopyBuf = new Uint8Array(0);
} else {
zeroCopyBuf = null;
}
const responseBodyRid = respond(
responseSenderRid,
resp,
zeroCopyBuf,
);
// If `respond` returns a responseBodyRid, we should stream the body
// to that resource.
if (typeof responseBodyRid === "number") {
if (!body || !(body instanceof ReadableStream)) {
throw new Error(
"internal error: recieved responseBodyRid, but response has no body or is not a stream",
);
}
for await (const chunk of body) {
const data = new Uint8Array(
chunk.buffer,
chunk.byteOffset,
chunk.byteLength,
);
await Deno.core.jsonOpAsync(
"op_http_response_write",
responseBodyRid,
data,
);
}
// Once all chunks are sent, and the request body is closed, we can close
// the response body.
await Deno.core.jsonOpAsync("op_http_response_close", responseBodyRid);
}
};
}
function createRequestBodyStream(requestBodyRid) {
return new ReadableStream({
type: "bytes",
async pull(controller) {
try {
// This is the largest possible size for a single packet on a TLS
// stream.
const chunk = new Uint8Array(16 * 1024 + 256);
const read = await readRequest(
requestBodyRid,
chunk,
);
if (read > 0) {
// We read some data. Enqueue it onto the stream.
controller.enqueue(chunk.subarray(0, read));
} else {
// We have reached the end of the body, so we close the stream.
controller.close();
core.close(requestBodyRid);
}
} catch (err) {
// There was an error while reading a chunk of the body, so we
// error.
controller.error(err);
controller.close();
core.close(requestBodyRid);
}
},
cancel() {
core.close(requestBodyRid);
},
});
}
window.__bootstrap.http = {
startHttp,
};
})(this);
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