diff options
Diffstat (limited to 'src/crypto/browserWorkerEntry.ts')
-rw-r--r-- | src/crypto/browserWorkerEntry.ts | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/src/crypto/browserWorkerEntry.ts b/src/crypto/browserWorkerEntry.ts new file mode 100644 index 000000000..3df59fe0d --- /dev/null +++ b/src/crypto/browserWorkerEntry.ts @@ -0,0 +1,120 @@ +/* + This file is part of TALER + (C) 2016 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/> + */ + +/** + * Web worker for crypto operations. + */ + +/** + * Imports. + */ + +import { CryptoImplementation } from "./cryptoImplementation"; +import { EmscEnvironment } from "./emscInterface"; + +const worker: Worker = (self as any) as Worker; + +class BrowserEmscriptenLoader { + private cachedEmscEnvironment: EmscEnvironment | undefined = undefined; + private cachedEmscEnvironmentPromise: + | Promise<EmscEnvironment> + | undefined = undefined; + + async getEmscriptenEnvironment(): Promise<EmscEnvironment> { + + if (this.cachedEmscEnvironment) { + return this.cachedEmscEnvironment; + } + + if (this.cachedEmscEnvironmentPromise) { + return this.cachedEmscEnvironmentPromise; + } + + console.log("loading emscripten lib with 'importScripts'"); + // @ts-ignore + self.TalerEmscriptenLib = {}; + // @ts-ignore + importScripts('/emscripten/taler-emscripten-lib.js') + // @ts-ignore + if (!self.TalerEmscriptenLib) { + throw Error("can't import taler emscripten lib"); + } + const locateFile = (path: string, scriptDir: string) => { + 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"); + // @ts-ignore + const lib = self.TalerEmscriptenLib({ locateFile }); + return new Promise((resolve, reject) => { + lib.then((mod: any) => { + this.cachedEmscEnvironmentPromise = undefined; + const emsc = new EmscEnvironment(mod); + this.cachedEmscEnvironment = new EmscEnvironment(mod); + console.log("emscripten module fully loaded"); + resolve(emsc); + }); + }); + } +} + +let loader = new BrowserEmscriptenLoader(); + +async function handleRequest(operation: string, id: number, args: string[]) { + let emsc = await loader.getEmscriptenEnvironment(); + + const impl = new CryptoImplementation(emsc); + + if (!(operation in impl)) { + console.error(`crypto operation '${operation}' not found`); + return; + } + + try { + const result = (impl as any)[operation](...args); + worker.postMessage({ result, id }); + } catch (e) { + console.log("error during operation", e); + return; + } +} + +worker.onmessage = (msg: MessageEvent) => { + const args = msg.data.args; + if (!Array.isArray(args)) { + console.error("args must be array"); + return; + } + const id = msg.data.id; + if (typeof id !== "number") { + console.error("RPC id must be number"); + return; + } + const operation = msg.data.operation; + if (typeof operation !== "string") { + console.error("RPC operation must be string"); + return; + } + + if (CryptoImplementation.enableTracing) { + console.log("onmessage with", operation); + } + + handleRequest(operation, id, args).catch((e) => { + console.error("error in browsere worker", e); + }); +}; |