fix(worker): constrain nonce value to be a whole integer

Closes #1043

Sometimes the worker could get into a strange state where it has a
decimal nonce, but the server assumes that the nonce can only be a whole
number. This patch constrains the nonce to be a whole number on the
worker end by detecting if the nonce is a decimal number and then
truncating away the decimal portion.

Signed-off-by: Xe Iaso <me@xeiaso.net>

web/js/worker/sha256-purejs.mjs

@@ -53,6 +53,18 @@ addEventListener('message', async ({ data: eventData }) => {
     nonce += threads;
     iterations++;
 
+    /* Truncate the decimal portion of the nonce. This is a bit of an evil bit
+     * hack, but it works reliably enough. The core of why this works is:
+     * 
+     * > 13.4 % 1 !== 0
+     * true
+     * > 13 % 1 !== 0
+     * false
+     */
+    if (nonce % 1 !== 0) {
+      nonce = Math.trunc(nonce);
+    }
+
     // Send a progress update from the main thread every 1024 iterations.
     if (isMainThread && (iterations & 1023) === 0) {
       postMessage(nonce);

web/js/worker/sha256-webcrypto.mjs

@@ -49,6 +49,18 @@ addEventListener("message", async ({ data: eventData }) => {
     nonce += threads;
     iterations++;
 
+    /* Truncate the decimal portion of the nonce. This is a bit of an evil bit
+     * hack, but it works reliably enough. The core of why this works is:
+     * 
+     * > 13.4 % 1 !== 0
+     * true
+     * > 13 % 1 !== 0
+     * false
+     */
+    if (nonce % 1 !== 0) {
+      nonce = Math.trunc(nonce);
+    }
+
     // Send a progress update from the main thread every 1024 iterations.
     if (isMainThread && (iterations & 1023) === 0) {
       postMessage(nonce);