@wapython/wasi
Version:
Javascript library for interacting with WASI Modules in Node.js and the Browser.
147 lines • 7.39 kB
JavaScript
;
var __assign = (this && this.__assign) || function () {
__assign = Object.assign || function(t) {
for (var s, i = 1, n = arguments.length; i < n; i++) {
s = arguments[i];
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
t[p] = s[p];
}
return t;
};
return __assign.apply(this, arguments);
};
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.run = void 0;
var wasi_1 = __importDefault(require("./wasi"));
var node_1 = __importDefault(require("./bindings/node"));
var fs_1 = __importDefault(require("fs"));
var promises_1 = require("fs/promises");
var debug_1 = __importDefault(require("debug"));
var log = (0, debug_1.default)("wasi");
function wasmImport(name, options) {
if (options === void 0) { options = {}; }
return __awaiter(this, void 0, void 0, function () {
function getrandom(bufPtr, bufLen, _flags) {
// NOTE: returning 0 here (our default stub behavior)
// would result in Python hanging on startup! So critical to do this.
node_1.default.randomFillSync(
// @ts-ignore
new Uint8Array(result.instance.exports.memory.buffer), bufPtr, bufLen);
return bufLen;
}
var pathToWasm, wasmOpts, wasi, opts, source, typedArray, result;
var _a;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
pathToWasm = "".concat(name).concat(name.endsWith(".wasm") ? "" : ".wasm");
wasmOpts = {
env: new Proxy(__assign({ getrandom: getrandom }, options === null || options === void 0 ? void 0 : options.env), {
get: function (target, key) {
if (key in target) {
return Reflect.get(target, key);
}
log("WARNING: creating stub for", key);
return function () {
var _args = [];
for (var _i = 0; _i < arguments.length; _i++) {
_args[_i] = arguments[_i];
}
return 0;
};
},
}),
};
wasi = undefined;
if (!(options === null || options === void 0 ? void 0 : options.noWasi)) {
opts = {
args: process.argv,
bindings: node_1.default,
env: process.env,
};
if (options.dir === null) {
// sandbox -- don't give any fs access
}
else {
opts.bindings = __assign(__assign({}, node_1.default), { fs: fs_1.default });
// just give full access; security of fs access isn't
// really relevant for us at this point
if (!options.dir) {
opts.preopens = { "/": "/" };
}
else {
opts.preopens = (_a = {}, _a[options.dir] = options.dir, _a);
}
}
wasi = new wasi_1.default(opts);
wasmOpts.wasi_snapshot_preview1 = wasi.wasiImport;
}
return [4 /*yield*/, (0, promises_1.readFile)(pathToWasm)];
case 1:
source = _b.sent();
typedArray = new Uint8Array(source);
return [4 /*yield*/, WebAssembly.instantiate(typedArray, wasmOpts)];
case 2:
result = _b.sent();
if (wasi != null) {
wasi.start(result.instance);
}
return [2 /*return*/];
}
});
});
}
function run(name, options) {
if (options === void 0) { options = {}; }
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
switch (_a.label) {
case 0: return [4 /*yield*/, wasmImport(name, options)];
case 1:
_a.sent();
return [2 /*return*/];
}
});
});
}
exports.run = run;
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