mirror of https://github.com/denoland/deno.git
120 lines
3.0 KiB
TypeScript
120 lines
3.0 KiB
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import * as util from "../util.ts";
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import { core } from "../core.ts";
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import { TextDecoder } from "../web/text_encoding.ts";
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import { ErrorKind, errors, getErrorClass } from "../errors.ts";
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// Using an object without a prototype because `Map` was causing GC problems.
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const promiseTableMin: {
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[key: number]: util.Resolvable<RecordMinimal>;
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} = Object.create(null);
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// Note it's important that promiseId starts at 1 instead of 0, because sync
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// messages are indicated with promiseId 0. If we ever add wrap around logic for
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// overflows, this should be taken into account.
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let _nextPromiseId = 1;
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const decoder = new TextDecoder();
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function nextPromiseId(): number {
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return _nextPromiseId++;
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}
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export interface RecordMinimal {
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promiseId: number;
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arg: number;
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result: number;
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err?: {
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kind: ErrorKind;
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message: string;
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};
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}
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export function recordFromBufMinimal(ui8: Uint8Array): RecordMinimal {
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const header = ui8.subarray(0, 12);
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const buf32 = new Int32Array(
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header.buffer,
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header.byteOffset,
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header.byteLength / 4
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);
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const promiseId = buf32[0];
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const arg = buf32[1];
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const result = buf32[2];
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let err;
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if (arg < 0) {
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const kind = result as ErrorKind;
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const message = decoder.decode(ui8.subarray(12));
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err = { kind, message };
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} else if (ui8.length != 12) {
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throw new errors.InvalidData("BadMessage");
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}
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return {
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promiseId,
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arg,
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result,
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err,
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};
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}
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function unwrapResponse(res: RecordMinimal): number {
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if (res.err != null) {
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throw new (getErrorClass(res.err.kind))(res.err.message);
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}
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return res.result;
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}
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const scratch32 = new Int32Array(3);
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const scratchBytes = new Uint8Array(
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scratch32.buffer,
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scratch32.byteOffset,
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scratch32.byteLength
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);
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util.assert(scratchBytes.byteLength === scratch32.length * 4);
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export function asyncMsgFromRust(ui8: Uint8Array): void {
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const record = recordFromBufMinimal(ui8);
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const { promiseId } = record;
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const promise = promiseTableMin[promiseId];
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delete promiseTableMin[promiseId];
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util.assert(promise);
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promise.resolve(record);
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}
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export async function sendAsyncMinimal(
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opId: number,
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arg: number,
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zeroCopy: Uint8Array
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): Promise<number> {
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const promiseId = nextPromiseId(); // AKA cmdId
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scratch32[0] = promiseId;
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scratch32[1] = arg;
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scratch32[2] = 0; // result
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const promise = util.createResolvable<RecordMinimal>();
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const buf = core.dispatch(opId, scratchBytes, zeroCopy);
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if (buf) {
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const record = recordFromBufMinimal(buf);
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// Sync result.
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promise.resolve(record);
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} else {
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// Async result.
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promiseTableMin[promiseId] = promise;
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}
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const res = await promise;
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return unwrapResponse(res);
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}
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export function sendSyncMinimal(
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opId: number,
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arg: number,
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zeroCopy: Uint8Array
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): number {
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scratch32[0] = 0; // promiseId 0 indicates sync
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scratch32[1] = arg;
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const res = core.dispatch(opId, scratchBytes, zeroCopy)!;
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const resRecord = recordFromBufMinimal(res);
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return unwrapResponse(resRecord);
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}
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