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42 lines
1.3 KiB
JavaScript
42 lines
1.3 KiB
JavaScript
import {getEventHash} from 'nostr-tools';
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import {zeroLeadingBitsCount} from './utils/crypto';
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const mine = (event, difficulty, timeout = 5) => {
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const max = 256; // arbitrary
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if (!Number.isInteger(difficulty) || difficulty < 0 || difficulty > max) {
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throw new Error(`difficulty must be an integer between 0 and ${max}`);
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}
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// continue with mining
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let n = BigInt(0);
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event.tags.unshift(['nonce', n.toString(), `${difficulty}`]);
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const until = Math.floor(Date.now() * 0.001) + timeout;
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console.time('pow');
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while (true) {
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const now = Math.floor(Date.now() * 0.001);
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if (timeout !== 0 && (now > until)) {
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console.timeEnd('pow');
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throw 'timeout';
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}
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if (now !== event.created_at) {
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event.created_at = now;
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// n = BigInt(0); // could reset nonce as we have a new timestamp
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}
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event.tags[0][1] = (++n).toString();
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const id = getEventHash(event);
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if (zeroLeadingBitsCount(id) === difficulty) {
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console.timeEnd('pow');
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return {id, ...event};
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}
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}
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};
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addEventListener('message', (msg) => {
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const {difficulty, event, timeout} = msg.data;
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try {
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const minedEvent = mine(event, difficulty, timeout);
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postMessage({event: minedEvent});
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} catch (err) {
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postMessage({error: err});
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}
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}); |