75 lines
2.6 KiB
JavaScript
75 lines
2.6 KiB
JavaScript
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"use strict";
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var __importDefault = (this && this.__importDefault) || function (mod) {
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return (mod && mod.__esModule) ? mod : { "default": mod };
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.run = void 0;
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const wasi_1 = __importDefault(require("./wasi"));
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const node_1 = __importDefault(require("./bindings/node"));
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const fs_1 = __importDefault(require("fs"));
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const promises_1 = require("fs/promises");
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const debug_1 = __importDefault(require("debug"));
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const log = (0, debug_1.default)("wasi");
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async function wasmImport(name, options = {}) {
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const pathToWasm = `${name}${name.endsWith(".wasm") ? "" : ".wasm"}`;
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function getrandom(bufPtr, bufLen, _flags) {
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// NOTE: returning 0 here (our default stub behavior)
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// would result in Python hanging on startup! So critical to do this.
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node_1.default.randomFillSync(
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// @ts-ignore
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new Uint8Array(result.instance.exports.memory.buffer), bufPtr, bufLen);
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return bufLen;
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}
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const wasmOpts = {
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env: new Proxy({ getrandom, ...options?.env }, {
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get(target, key) {
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if (key in target) {
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return Reflect.get(target, key);
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}
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log("WARNING: creating stub for", key);
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return (..._args) => {
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return 0;
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};
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},
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}),
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};
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let wasi = undefined;
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if (!options?.noWasi) {
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const opts = {
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args: process.argv,
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bindings: node_1.default,
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env: process.env,
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};
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if (options.dir === null) {
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// sandbox -- don't give any fs access
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}
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else {
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opts.bindings = {
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...node_1.default,
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fs: fs_1.default,
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};
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// just give full access; security of fs access isn't
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// really relevant for us at this point
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if (!options.dir) {
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opts.preopens = { "/": "/" };
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}
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else {
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opts.preopens = { [options.dir]: options.dir };
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}
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}
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wasi = new wasi_1.default(opts);
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wasmOpts.wasi_snapshot_preview1 = wasi.wasiImport;
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}
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//console.log(`reading ${pathToWasm}`);
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const source = await (0, promises_1.readFile)(pathToWasm);
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const typedArray = new Uint8Array(source);
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const result = await WebAssembly.instantiate(typedArray, wasmOpts);
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if (wasi != null) {
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wasi.start(result.instance);
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}
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}
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async function run(name, options = {}) {
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await wasmImport(name, options);
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}
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exports.run = run;
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//# sourceMappingURL=runtime.js.map
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