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https://github.com/denoland/deno.git
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424 lines
12 KiB
JavaScript
424 lines
12 KiB
JavaScript
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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"use strict";
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((window) => {
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const {
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Error,
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RangeError,
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ReferenceError,
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SyntaxError,
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TypeError,
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URIError,
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Map,
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Array,
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ArrayPrototypeFill,
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ArrayPrototypePush,
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ArrayPrototypeMap,
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ErrorCaptureStackTrace,
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Promise,
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ObjectFromEntries,
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MapPrototypeGet,
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MapPrototypeHas,
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MapPrototypeDelete,
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MapPrototypeSet,
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PromisePrototypeThen,
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PromisePrototypeFinally,
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StringPrototypeSlice,
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ObjectAssign,
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SymbolFor,
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setQueueMicrotask,
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} = window.__bootstrap.primordials;
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const { ops } = window.Deno.core;
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const errorMap = {};
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// Builtin v8 / JS errors
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registerErrorClass("Error", Error);
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registerErrorClass("RangeError", RangeError);
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registerErrorClass("ReferenceError", ReferenceError);
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registerErrorClass("SyntaxError", SyntaxError);
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registerErrorClass("TypeError", TypeError);
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registerErrorClass("URIError", URIError);
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let nextPromiseId = 1;
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const promiseMap = new Map();
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const RING_SIZE = 4 * 1024;
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const NO_PROMISE = null; // Alias to null is faster than plain nulls
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const promiseRing = ArrayPrototypeFill(new Array(RING_SIZE), NO_PROMISE);
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// TODO(bartlomieju): it future use `v8::Private` so it's not visible
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// to users. Currently missing bindings.
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const promiseIdSymbol = SymbolFor("Deno.core.internalPromiseId");
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let opCallTracingEnabled = false;
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const opCallTraces = new Map();
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function enableOpCallTracing() {
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opCallTracingEnabled = true;
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}
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function isOpCallTracingEnabled() {
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return opCallTracingEnabled;
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}
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function setPromise(promiseId) {
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const idx = promiseId % RING_SIZE;
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// Move old promise from ring to map
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const oldPromise = promiseRing[idx];
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if (oldPromise !== NO_PROMISE) {
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const oldPromiseId = promiseId - RING_SIZE;
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MapPrototypeSet(promiseMap, oldPromiseId, oldPromise);
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}
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// Set new promise
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return promiseRing[idx] = newPromise();
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}
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function getPromise(promiseId) {
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// Check if out of ring bounds, fallback to map
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const outOfBounds = promiseId < nextPromiseId - RING_SIZE;
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if (outOfBounds) {
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const promise = MapPrototypeGet(promiseMap, promiseId);
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MapPrototypeDelete(promiseMap, promiseId);
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return promise;
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}
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// Otherwise take from ring
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const idx = promiseId % RING_SIZE;
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const promise = promiseRing[idx];
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promiseRing[idx] = NO_PROMISE;
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return promise;
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}
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function newPromise() {
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let resolve, reject;
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const promise = new Promise((resolve_, reject_) => {
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resolve = resolve_;
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reject = reject_;
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});
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promise.resolve = resolve;
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promise.reject = reject;
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return promise;
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}
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function hasPromise(promiseId) {
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// Check if out of ring bounds, fallback to map
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const outOfBounds = promiseId < nextPromiseId - RING_SIZE;
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if (outOfBounds) {
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return MapPrototypeHas(promiseMap, promiseId);
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}
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// Otherwise check it in ring
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const idx = promiseId % RING_SIZE;
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return promiseRing[idx] != NO_PROMISE;
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}
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function opresolve() {
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for (let i = 0; i < arguments.length; i += 2) {
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const promiseId = arguments[i];
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const res = arguments[i + 1];
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const promise = getPromise(promiseId);
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promise.resolve(res);
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}
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}
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function registerErrorClass(className, errorClass) {
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registerErrorBuilder(className, (msg) => new errorClass(msg));
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}
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function registerErrorBuilder(className, errorBuilder) {
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if (typeof errorMap[className] !== "undefined") {
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throw new TypeError(`Error class for "${className}" already registered`);
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}
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errorMap[className] = errorBuilder;
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}
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function buildCustomError(className, message, code) {
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let error;
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try {
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error = errorMap[className]?.(message);
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} catch (e) {
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throw new Error(
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`Unsable to build custom error for "${className}"\n ${e.message}`,
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);
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}
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// Strip buildCustomError() calls from stack trace
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if (typeof error == "object") {
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ErrorCaptureStackTrace(error, buildCustomError);
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if (code) {
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error.code = code;
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}
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}
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return error;
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}
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function unwrapOpResult(res) {
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// .$err_class_name is a special key that should only exist on errors
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if (res?.$err_class_name) {
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const className = res.$err_class_name;
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const errorBuilder = errorMap[className];
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const err = errorBuilder ? errorBuilder(res.message) : new Error(
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`Unregistered error class: "${className}"\n ${res.message}\n Classes of errors returned from ops should be registered via Deno.core.registerErrorClass().`,
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);
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// Set .code if error was a known OS error, see error_codes.rs
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if (res.code) {
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err.code = res.code;
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}
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// Strip unwrapOpResult() and errorBuilder() calls from stack trace
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ErrorCaptureStackTrace(err, unwrapOpResult);
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throw err;
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}
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return res;
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}
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function rollPromiseId() {
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return nextPromiseId++;
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}
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// Generate async op wrappers. See core/bindings.rs
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function initializeAsyncOps() {
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function genAsyncOp(op, name, args) {
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return new Function(
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"setPromise",
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"getPromise",
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"promiseIdSymbol",
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"rollPromiseId",
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"handleOpCallTracing",
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"op",
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"unwrapOpResult",
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"PromisePrototypeThen",
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`
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return function ${name}(${args}) {
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const id = rollPromiseId();
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let promise = PromisePrototypeThen(setPromise(id), unwrapOpResult);
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try {
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op(id, ${args});
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} catch (err) {
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// Cleanup the just-created promise
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getPromise(id);
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// Rethrow the error
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throw err;
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}
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promise = handleOpCallTracing("${name}", id, promise);
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promise[promiseIdSymbol] = id;
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return promise;
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}
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`,
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)(
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setPromise,
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getPromise,
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promiseIdSymbol,
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rollPromiseId,
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handleOpCallTracing,
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op,
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unwrapOpResult,
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PromisePrototypeThen,
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);
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}
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// { <name>: <argc>, ... }
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for (const ele of Object.entries(ops.asyncOpsInfo())) {
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if (!ele) continue;
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const [name, argc] = ele;
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const op = ops[name];
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const args = Array.from({ length: argc }, (_, i) => `arg${i}`).join(", ");
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ops[name] = genAsyncOp(op, name, args);
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}
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}
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function handleOpCallTracing(opName, promiseId, p) {
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if (opCallTracingEnabled) {
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const stack = StringPrototypeSlice(new Error().stack, 6);
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MapPrototypeSet(opCallTraces, promiseId, { opName, stack });
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return PromisePrototypeFinally(
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p,
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() => MapPrototypeDelete(opCallTraces, promiseId),
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);
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} else {
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return p;
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}
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}
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function opAsync(opName, ...args) {
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return ops[opName](...args);
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}
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function refOp(promiseId) {
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if (!hasPromise(promiseId)) {
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return;
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}
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ops.op_ref_op(promiseId);
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}
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function unrefOp(promiseId) {
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if (!hasPromise(promiseId)) {
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return;
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}
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ops.op_unref_op(promiseId);
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}
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function resources() {
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return ObjectFromEntries(ops.op_resources());
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}
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function metrics() {
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const [aggregate, perOps] = ops.op_metrics();
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aggregate.ops = ObjectFromEntries(ArrayPrototypeMap(
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ops.op_op_names(),
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(opName, opId) => [opName, perOps[opId]],
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));
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return aggregate;
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}
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let reportExceptionCallback = undefined;
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// Used to report errors thrown from functions passed to `queueMicrotask()`.
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// The callback will be passed the thrown error. For example, you can use this
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// to dispatch an error event to the global scope.
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// In other words, set the implementation for
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// https://html.spec.whatwg.org/multipage/webappapis.html#report-the-exception
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function setReportExceptionCallback(cb) {
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if (typeof cb != "function") {
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throw new TypeError("expected a function");
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}
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reportExceptionCallback = cb;
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}
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function queueMicrotask(cb) {
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if (typeof cb != "function") {
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throw new TypeError("expected a function");
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}
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return ops.op_queue_microtask(() => {
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try {
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cb();
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} catch (error) {
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if (reportExceptionCallback) {
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reportExceptionCallback(error);
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} else {
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throw error;
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}
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}
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});
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}
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// Some "extensions" rely on "BadResource" and "Interrupted" errors in the
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// JS code (eg. "deno_net") so they are provided in "Deno.core" but later
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// reexported on "Deno.errors"
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class BadResource extends Error {
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constructor(msg) {
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super(msg);
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this.name = "BadResource";
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}
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}
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const BadResourcePrototype = BadResource.prototype;
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class Interrupted extends Error {
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constructor(msg) {
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super(msg);
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this.name = "Interrupted";
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}
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}
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const InterruptedPrototype = Interrupted.prototype;
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const promiseHooks = {
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init: [],
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before: [],
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after: [],
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resolve: [],
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hasBeenSet: false,
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};
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function setPromiseHooks(init, before, after, resolve) {
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if (init) ArrayPrototypePush(promiseHooks.init, init);
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if (before) ArrayPrototypePush(promiseHooks.before, before);
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if (after) ArrayPrototypePush(promiseHooks.after, after);
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if (resolve) ArrayPrototypePush(promiseHooks.resolve, resolve);
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if (!promiseHooks.hasBeenSet) {
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promiseHooks.hasBeenSet = true;
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ops.op_set_promise_hooks((promise, parentPromise) => {
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for (let i = 0; i < promiseHooks.init.length; ++i) {
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promiseHooks.init[i](promise, parentPromise);
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}
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}, (promise) => {
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for (let i = 0; i < promiseHooks.before.length; ++i) {
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promiseHooks.before[i](promise);
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}
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}, (promise) => {
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for (let i = 0; i < promiseHooks.after.length; ++i) {
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promiseHooks.after[i](promise);
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}
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}, (promise) => {
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for (let i = 0; i < promiseHooks.resolve.length; ++i) {
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promiseHooks.resolve[i](promise);
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}
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});
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}
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}
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// Extra Deno.core.* exports
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const core = ObjectAssign(globalThis.Deno.core, {
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opAsync,
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initializeAsyncOps,
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resources,
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metrics,
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registerErrorBuilder,
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registerErrorClass,
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buildCustomError,
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opresolve,
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BadResource,
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BadResourcePrototype,
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Interrupted,
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InterruptedPrototype,
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enableOpCallTracing,
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isOpCallTracingEnabled,
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opCallTraces,
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refOp,
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unrefOp,
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setReportExceptionCallback,
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setPromiseHooks,
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close: (rid) => ops.op_close(rid),
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tryClose: (rid) => ops.op_try_close(rid),
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read: (rid, buffer) => ops.op_read(rid, buffer),
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readAll: (rid) => ops.op_read_all(rid),
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write: (rid, buffer) => ops.op_write(rid, buffer),
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writeAll: (rid, buffer) => ops.op_write_all(rid, buffer),
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shutdown: (rid) => ops.op_shutdown(rid),
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print: (msg, isErr) => ops.op_print(msg, isErr),
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setMacrotaskCallback: (fn) => ops.op_set_macrotask_callback(fn),
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setNextTickCallback: (fn) => ops.op_set_next_tick_callback(fn),
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runMicrotasks: () => ops.op_run_microtasks(),
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hasTickScheduled: () => ops.op_has_tick_scheduled(),
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setHasTickScheduled: (bool) => ops.op_set_has_tick_scheduled(bool),
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evalContext: (
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source,
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specifier,
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) => ops.op_eval_context(source, specifier),
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createHostObject: () => ops.op_create_host_object(),
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encode: (text) => ops.op_encode(text),
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decode: (buffer) => ops.op_decode(buffer),
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serialize: (
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value,
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options,
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errorCallback,
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) => ops.op_serialize(value, options, errorCallback),
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deserialize: (buffer, options) => ops.op_deserialize(buffer, options),
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getPromiseDetails: (promise) => ops.op_get_promise_details(promise),
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getProxyDetails: (proxy) => ops.op_get_proxy_details(proxy),
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isProxy: (value) => ops.op_is_proxy(value),
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memoryUsage: () => ops.op_memory_usage(),
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setWasmStreamingCallback: (fn) => ops.op_set_wasm_streaming_callback(fn),
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abortWasmStreaming: (
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rid,
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error,
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) => ops.op_abort_wasm_streaming(rid, error),
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destructureError: (error) => ops.op_destructure_error(error),
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opNames: () => ops.op_op_names(),
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eventLoopHasMoreWork: () => ops.op_event_loop_has_more_work(),
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setPromiseRejectCallback: (fn) => ops.op_set_promise_reject_callback(fn),
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byteLength: (str) => ops.op_str_byte_length(str),
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});
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ObjectAssign(globalThis.__bootstrap, { core });
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ObjectAssign(globalThis.Deno, { core });
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// Direct bindings on `globalThis`
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ObjectAssign(globalThis, { queueMicrotask });
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setQueueMicrotask(queueMicrotask);
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})(globalThis);
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