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// Copyright 2018 the Deno authors. All rights reserved. MIT license.
import {
assert,
log,
createResolvable,
Resolvable,
typedArrayToArrayBuffer,
notImplemented
} from "./util";
import * as flatbuffers from "./flatbuffers";
import { sendAsync } from "./dispatch";
import * as msg from "gen/msg_generated";
import * as domTypes from "./dom_types";
import { TextDecoder } from "./text_encoding";
import { DenoBlob } from "./blob";
import { Headers } from "./headers";
class FetchResponse implements domTypes.Response {
readonly url: string = "";
body: null;
bodyUsed = false; // TODO
statusText = "FIXME"; // TODO
readonly type = "basic"; // TODO
redirected = false; // TODO
headers: domTypes.Headers;
readonly trailer: Promise<domTypes.Headers>;
//private bodyChunks: Uint8Array[] = [];
private first = true;
private bodyData: ArrayBuffer;
private bodyWaiter: Resolvable<ArrayBuffer>;
constructor(
readonly status: number,
readonly body_: ArrayBuffer,
headersList: Array<[string, string]>
) {
this.bodyWaiter = createResolvable();
this.trailer = createResolvable();
this.headers = new Headers(headersList);
this.bodyData = body_;
setTimeout(() => {
this.bodyWaiter.resolve(body_);
}, 0);
}
arrayBuffer(): Promise<ArrayBuffer> {
return this.bodyWaiter;
}
async blob(): Promise<domTypes.Blob> {
const arrayBuffer = await this.arrayBuffer();
return new DenoBlob([arrayBuffer], {
type: this.headers.get("content-type") || ""
});
}
async formData(): Promise<domTypes.FormData> {
notImplemented();
return {} as domTypes.FormData;
}
async json(): Promise<object> {
const text = await this.text();
return JSON.parse(text);
}
async text(): Promise<string> {
const ab = await this.arrayBuffer();
const decoder = new TextDecoder("utf-8");
return decoder.decode(ab);
}
get ok(): boolean {
return 200 <= this.status && this.status < 300;
}
clone(): domTypes.Response {
if (this.bodyUsed) {
throw new TypeError(
"Failed to execute 'clone' on 'Response': Response body is already used"
);
}
const iterators = this.headers.entries();
const headersList: Array<[string, string]> = [];
for (const header of iterators) {
headersList.push(header);
}
return new FetchResponse(this.status, this.bodyData.slice(0), headersList);
}
onHeader?: (res: FetchResponse) => void;
onError?: (error: Error) => void;
onMsg(base: msg.Base) {
/*
const error = base.error();
if (error != null) {
assert(this.onError != null);
this.onError!(new Error(error));
return;
}
*/
if (this.first) {
this.first = false;
}
}
}
/** Fetch a resource from the network. */
export async function fetch(
input?: domTypes.Request | string,
init?: domTypes.RequestInit
): Promise<domTypes.Response> {
const url = input as string;
log("dispatch FETCH_REQ", url);
// Send Fetch message
const builder = flatbuffers.createBuilder();
const url_ = builder.createString(url);
msg.Fetch.startFetch(builder);
msg.Fetch.addUrl(builder, url_);
const resBase = await sendAsync(
builder,
msg.Any.Fetch,
msg.Fetch.endFetch(builder)
);
// Decode FetchRes
assert(msg.Any.FetchRes === resBase.innerType());
const inner = new msg.FetchRes();
assert(resBase.inner(inner) != null);
const status = inner.status();
const bodyArray = inner.bodyArray();
assert(bodyArray != null);
const body = typedArrayToArrayBuffer(bodyArray!);
const headersList: Array<[string, string]> = [];
const len = inner.headerKeyLength();
for (let i = 0; i < len; ++i) {
const key = inner.headerKey(i);
const value = inner.headerValue(i);
headersList.push([key, value]);
}
const response = new FetchResponse(status, body, headersList);
return response;
}
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