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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
"use strict";
((window) => {
// Available on start due to bindings.
const { opcall } = window.Deno.core;
let opsCache = {};
const errorMap = {};
// Builtin v8 / JS errors
registerErrorClass("Error", Error);
registerErrorClass("RangeError", RangeError);
registerErrorClass("ReferenceError", ReferenceError);
registerErrorClass("SyntaxError", SyntaxError);
registerErrorClass("TypeError", TypeError);
registerErrorClass("URIError", URIError);
let nextPromiseId = 1;
const promiseMap = new Map();
const RING_SIZE = 4 * 1024;
const NO_PROMISE = null; // Alias to null is faster than plain nulls
const promiseRing = new Array(RING_SIZE).fill(NO_PROMISE);
function setPromise(promiseId) {
const idx = promiseId % RING_SIZE;
// Move old promise from ring to map
const oldPromise = promiseRing[idx];
if (oldPromise !== NO_PROMISE) {
const oldPromiseId = promiseId - RING_SIZE;
promiseMap.set(oldPromiseId, oldPromise);
}
// Set new promise
return promiseRing[idx] = newPromise();
}
function getPromise(promiseId) {
// Check if out of ring bounds, fallback to map
const outOfBounds = promiseId < nextPromiseId - RING_SIZE;
if (outOfBounds) {
const promise = promiseMap.get(promiseId);
promiseMap.delete(promiseId);
return promise;
}
// Otherwise take from ring
const idx = promiseId % RING_SIZE;
const promise = promiseRing[idx];
promiseRing[idx] = NO_PROMISE;
return promise;
}
function newPromise() {
let resolve, reject;
const promise = new Promise((resolve_, reject_) => {
resolve = resolve_;
reject = reject_;
});
promise.resolve = resolve;
promise.reject = reject;
return promise;
}
function ops() {
return opsCache;
}
function syncOpsCache() {
// op id 0 is a special value to retrieve the map of registered ops.
opsCache = Object.freeze(Object.fromEntries(opcall(0)));
}
function handleAsyncMsgFromRust() {
for (let i = 0; i < arguments.length; i += 2) {
const promiseId = arguments[i];
const res = arguments[i + 1];
const promise = getPromise(promiseId);
promise.resolve(res);
}
}
function dispatch(opName, promiseId, control, zeroCopy) {
const opId = typeof opName === "string" ? opsCache[opName] : opName;
return opcall(opId, promiseId, control, zeroCopy);
}
function registerErrorClass(className, errorClass) {
registerErrorBuilder(className, (msg) => new errorClass(msg));
}
function registerErrorBuilder(className, errorBuilder) {
if (typeof errorMap[className] !== "undefined") {
throw new TypeError(`Error class for "${className}" already registered`);
}
errorMap[className] = errorBuilder;
}
function unwrapOpResult(res) {
// .$err_class_name is a special key that should only exist on errors
if (res?.$err_class_name) {
const className = res.$err_class_name;
const errorBuilder = errorMap[className];
if (!errorBuilder) {
throw new Error(
`Unregistered error class: "${className}"\n ${res.message}\n Classes of errors returned from ops should be registered via Deno.core.registerErrorClass().`,
);
}
throw errorBuilder(res.message);
}
return res;
}
function opAsync(opName, arg1 = null, arg2 = null) {
const promiseId = nextPromiseId++;
const maybeError = dispatch(opName, promiseId, arg1, arg2);
// Handle sync error (e.g: error parsing args)
if (maybeError) return unwrapOpResult(maybeError);
return setPromise(promiseId).then(unwrapOpResult);
}
function opSync(opName, arg1 = null, arg2 = null) {
return unwrapOpResult(dispatch(opName, null, arg1, arg2));
}
function resources() {
return Object.fromEntries(opSync("op_resources"));
}
function close(rid) {
opSync("op_close", rid);
}
function print(str, isErr = false) {
opSync("op_print", str, isErr);
}
// Provide bootstrap namespace
window.__bootstrap = {};
// Extra Deno.core.* exports
Object.assign(window.Deno.core, {
opAsync,
opSync,
ops,
close,
print,
resources,
registerErrorBuilder,
registerErrorClass,
handleAsyncMsgFromRust,
syncOpsCache,
});
})(this);
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