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// Copyright 2018 the Deno authors. All rights reserved. MIT license.
import {
assert,
log,
createResolvable,
Resolvable,
typedArrayToArrayBuffer,
notImplemented
} from "./util";
import { flatbuffers } from "flatbuffers";
import { sendAsync } from "./fbs_util";
import { deno as fbs } from "gen/msg_generated";
import {
Headers,
Request,
Response,
Blob,
RequestInit,
FormData
} from "./fetch_types";
import { TextDecoder } from "./text_encoding";
class DenoHeaders implements Headers {
append(name: string, value: string): void {
assert(false, "Implement me");
}
delete(name: string): void {
assert(false, "Implement me");
}
get(name: string): string | null {
assert(false, "Implement me");
return null;
}
has(name: string): boolean {
assert(false, "Implement me");
return false;
}
set(name: string, value: string): void {
assert(false, "Implement me");
}
forEach(
callbackfn: (value: string, key: string, parent: Headers) => void,
// tslint:disable-next-line:no-any
thisArg?: any
): void {
assert(false, "Implement me");
}
}
class FetchResponse implements Response {
readonly url: string = "";
body: null;
bodyUsed = false; // TODO
statusText = "FIXME"; // TODO
readonly type = "basic"; // TODO
redirected = false; // TODO
headers = new DenoHeaders();
readonly trailer: Promise<Headers>;
//private bodyChunks: Uint8Array[] = [];
private first = true;
private bodyWaiter: Resolvable<ArrayBuffer>;
constructor(readonly status: number, readonly body_: ArrayBuffer) {
this.bodyWaiter = createResolvable();
this.trailer = createResolvable();
setTimeout(() => {
this.bodyWaiter.resolve(body_);
}, 0);
}
arrayBuffer(): Promise<ArrayBuffer> {
return this.bodyWaiter;
}
async blob(): Promise<Blob> {
notImplemented();
return {} as Blob;
}
async formData(): Promise<FormData> {
notImplemented();
return {} as 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(): Response {
notImplemented();
return {} as Response;
}
onHeader?: (res: FetchResponse) => void;
onError?: (error: Error) => void;
onMsg(base: fbs.Base) {
/*
const error = base.error();
if (error != null) {
assert(this.onError != null);
this.onError!(new Error(error));
return;
}
*/
if (this.first) {
this.first = false;
}
}
}
export async function fetch(
input?: Request | string,
init?: RequestInit
): Promise<Response> {
const url = input as string;
log("dispatch FETCH_REQ", url);
// Send FetchReq message
const builder = new flatbuffers.Builder();
const url_ = builder.createString(url);
fbs.FetchReq.startFetchReq(builder);
fbs.FetchReq.addUrl(builder, url_);
const resBase = await sendAsync(
builder,
fbs.Any.FetchReq,
fbs.FetchReq.endFetchReq(builder)
);
// Decode FetchRes
assert(fbs.Any.FetchRes === resBase.msgType());
const msg = new fbs.FetchRes();
assert(resBase.msg(msg) != null);
const status = msg.status();
const bodyArray = msg.bodyArray();
assert(bodyArray != null);
const body = typedArrayToArrayBuffer(bodyArray!);
const response = new FetchResponse(status, body);
return response;
}
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