[taler-wallet-core] branch master updated: fall back to synchronous workers on old nodejs

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dold pushed a commit to branch master
in repository wallet-core.

The following commit(s) were added to refs/heads/master by this push:
     new 055685e7 fall back to synchronous workers on old nodejs
055685e7 is described below

commit 055685e78528aaf6b57ce70c4cc0221f5c0f37a3
Author: Florian Dold <address@hidden>
AuthorDate: Mon Feb 24 22:38:07 2020 +0530

    fall back to synchronous workers on old nodejs
---
 package.json            |  2 +-
 src/headless/helpers.ts | 16 +++++++++++-----
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/package.json b/package.json
index 93813c63..412d34f1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "taler-wallet",
-  "version": "0.6.8",
+  "version": "0.6.9",
   "description": "",
   "main": "dist/node/index.js",
   "repository": {
diff --git a/src/headless/helpers.ts b/src/headless/helpers.ts
index 6832cd4f..a5dad385 100644
--- a/src/headless/helpers.ts
+++ b/src/headless/helpers.ts
@@ -34,6 +34,7 @@ import { WalletNotification, NotificationType } from 
"../types/notifications";
 import { Database } from "../util/query";
 import { NodeHttpLib } from "./NodeHttpLib";
 import { Logger } from "../util/logging";
+import { SynchronousCryptoWorkerFactory } from 
"../crypto/workers/synchronousWorker";
 
 const logger = new Logger("helpers.ts");
 
@@ -113,14 +114,19 @@ export async function getDefaultNodeWallet(
 
   const myDb = await openTalerDatabase(myIdbFactory, myVersionChange);
 
-  //const worker = new SynchronousCryptoWorkerFactory();
-  //const worker = new NodeCryptoWorkerFactory();
-
-  const worker = new NodeThreadCryptoWorkerFactory();
+  let workerFactory;
+  try {
+    // Try if we have worker threads available, fails in older node versions.
+    require("worker_threads")
+    workerFactory = new NodeThreadCryptoWorkerFactory();
+  } catch (e) {
+    console.log("worker threads not available, falling back to synchronous 
workers");
+    workerFactory = new SynchronousCryptoWorkerFactory();
+  }
 
   const dbWrap = new Database(myDb);
 
-  const w = new Wallet(dbWrap, myHttpLib, worker);
+  const w = new Wallet(dbWrap, myHttpLib, workerFactory);
   if (args.notifyHandler) {
     w.addNotificationListener(args.notifyHandler);
   }

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