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/*
This file is part of TALER
(C) 2017 Inria and GNUnet e.V.
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
// @ts-nocheck
/**
* This module loads the emscripten library, and is written in unchecked
* JavaScript since it needs to do environment detection and dynamically select
* the right way to load the library.
*/
let cachedLib = undefined;
let cachedLibPromise = undefined;
export let enableTracing = false;
/**
* Load the taler emscripten lib.
*
* If in a WebWorker, importScripts is used. Inside a browser, the module must
* be globally available. Inside node, require is used.
*
* Returns a Promise<{ lib: EmscLib }>
*/
export function getLib() {
enableTracing && console.log("in getLib");
if (cachedLib) {
enableTracing && console.log("lib is cached");
return Promise.resolve({ lib: cachedLib });
}
if (cachedLibPromise) {
return cachedLibPromise;
}
if (typeof require !== "undefined") {
enableTracing && console.log("trying to load emscripten lib with 'require'");
// Make sure that TypeScript doesn't try
// to check the taler-emscripten-lib.
const indirectRequire = require;
const g = global;
// unavoidable hack, so that emscripten detects
// the environment as node even though importScripts
// is present.
const savedImportScripts = g.importScripts;
delete g.importScripts;
// Assume that the code is run from the build/ directory.
const libFn = indirectRequire("../../../emscripten/taler-emscripten-lib.js");
const lib = libFn();
g.importScripts = savedImportScripts;
if (lib) {
if (!lib.ccall) {
throw Error("sanity check failed: taler-emscripten lib does not have 'ccall'");
}
cachedLibPromise = new Promise((resolve, reject) => {
lib.onRuntimeInitialized = () => {
cachedLib = lib;
cachedLibPromise = undefined;
resolve({ lib: cachedLib });
};
});
return cachedLibPromise;
} else {
// When we're running as a webpack bundle, the above require might
// have failed and returned 'undefined', so we try other ways to import.
console.log("failed to load emscripten lib with 'require', trying alternatives");
}
}
if (typeof importScripts !== "undefined") {
console.log("trying to load emscripten lib with 'importScripts'");
self.TalerEmscriptenLib = {};
importScripts('/emscripten/taler-emscripten-lib.js')
if (!self.TalerEmscriptenLib) {
throw Error("can't import taler emscripten lib");
}
const locateFile = (path, scriptDir) => {
console.log("locating file", "path", path, "scriptDir", scriptDir);
// This is quite hacky and assumes that our scriptDir is dist/
return scriptDir + "../emscripten/" + path;
};
console.log("instantiating TalerEmscriptenLib");
const lib = self.TalerEmscriptenLib({ locateFile });
cachedLib = lib;
return new Promise((resolve, reject) => {
lib.then(mod => {
console.log("emscripten module fully loaded");
resolve({ lib: mod });
});
});
}
// Last resort, we don't have require, we're not running in a webworker.
// Maybe we're on a normal browser page, in this case TalerEmscriptenLib
// must be included in a script tag on the page.
if (typeof window !== "undefined") {
if (window.TalerEmscriptenLib) {
return Promise.resolve(TalerEmscriptenLib);
}
throw Error("Looks like running in browser, but TalerEmscriptenLib is not defined");
}
throw Error("Running in unsupported environment");
}
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