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115 lines
3.2 KiB
JavaScript
115 lines
3.2 KiB
JavaScript
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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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 util = window.__bootstrap.util;
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// Using an object without a prototype because `Map` was causing GC problems.
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const promiseTableMin = Object.create(null);
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const decoder = new TextDecoder();
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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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function nextPromiseId() {
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return _nextPromiseId++;
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}
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function recordFromBufMinimal(ui8) {
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const headerLen = 12;
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const header = ui8.subarray(0, headerLen);
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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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err = {
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className: decoder.decode(ui8.subarray(headerLen, headerLen + result)),
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message: decoder.decode(ui8.subarray(headerLen + result)),
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};
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} else if (ui8.length != 12) {
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throw new TypeError("Malformed response message");
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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) {
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if (res.err != null) {
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const ErrorClass = core.getErrorClass(res.err.className);
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if (!ErrorClass) {
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throw new Error(
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`Unregistered error class: "${res.err.className}"\n ${res.err.message}\n Classes of errors returned from ops should be registered via Deno.core.registerErrorClass().`,
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);
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}
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throw new ErrorClass(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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function asyncMsgFromRust(ui8) {
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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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async function sendAsync(opName, arg, zeroCopy) {
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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();
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const buf = core.dispatchByName(opName, scratchBytes, zeroCopy);
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if (buf != null) {
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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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function sendSync(opName, arg, zeroCopy) {
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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.dispatchByName(opName, 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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window.__bootstrap.dispatchMinimal = {
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asyncMsgFromRust,
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sendSync,
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sendAsync,
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};
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})(this);
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