87 lines
2.0 KiB
JavaScript
87 lines
2.0 KiB
JavaScript
/* Very simple worker which tries to find a nonce value to create a cryptonight-hash which
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* is lower than the given target. */
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importScripts('cn.js'); // imports the cn.js "glue" script generated by emscripten
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// webassembly cryptonight is called here.
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var cn = Module.cwrap('hash_cn', 'string', ['string', 'string']);
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// A few helper (string) functions to help us working with the hex string
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// which is used
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function zeroPad(num, places) {
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var zero = places - num.toString().length + 1;
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return Array(+(zero > 0 && zero)).join("0") + num;
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}
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function hex2int(s) {
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return parseInt(s.match(/[a-fA-F0-9]{2}/g).reverse().join(''), 16);
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}
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function int2hex(i) {
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return (zeroPad(i.toString(16), 8)).match(/[a-fA-F0-9]{2}/g).reverse().join('');
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}
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function getRandomInt(min, max) {
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return Math.floor(Math.random() * (max - min + 1)) + min;
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}
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onmessage = function (e) {
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var jbthrt = e.data;
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var job = jbthrt.job;
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var thrt = jbthrt.throttle;
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var bsuccess = false;
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var hash = "";
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var hexnonce = 0;
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// calculate a cryptonight hash
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var calcHash = function () {
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if (job !== null) {
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var target = hex2int(job.target);
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var inonce = getRandomInt(0, 0xFFFFFFFF);
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hexnonce = int2hex(inonce);
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try {
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hash = cn(job.blob, hexnonce);
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var hashval = hex2int(hash.substring(56, 64));
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bsuccess = hashval < target;
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}
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catch (err) { console.log(err); }
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}
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};
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// submit a cryptonight hash
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var submit = function () {
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if (bsuccess) {
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var msg = {
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identifier: "solved",
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job_id: job.job_id,
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nonce: hexnonce,
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result: hash
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};
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postMessage(JSON.stringify(msg));
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} else {
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postMessage("nothing");
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}
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};
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if (thrt === 0) { calcHash(); submit(); }
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else {
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var t0 = performance.now();
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calcHash();
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var dt = performance.now() - t0;
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var sleept = Math.round(thrt / (100 - thrt + 10) * dt);
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setTimeout(submit, sleept);
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}
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};
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