41 lines
2.4 KiB
JavaScript
41 lines
2.4 KiB
JavaScript
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import { Tx } from '@cmdcode/tapscript';
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import { readEnvelope } from './inscription.js';
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// Rebuild solely from serialized transactions, never collectible/UI sidecars.
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// Discovery is a convention, not native ord metaprotocol tag 7 support.
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export class MetadataIndex {
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constructor(chain) {
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this.events = [];
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const visit = (raw, height, block) => {
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const tx = Tx.decode(raw);
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if (tx.vin[0]?.witness?.length !== 3) return;
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const item = readEnvelope(tx.vin[0].witness);
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const metadata = item.metadata;
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this.events.push({ id: `${Tx.util.getTxid(tx)}i0`, contentType: item.contentType,
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status: height === null ? 'pending' : 'confirmed', height, block,
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metadata: metadata ?? null, hasMetadata: metadata !== undefined, parent: item.parent,
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protocol: metadata && !Array.isArray(metadata) && typeof metadata === 'object' &&
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Object.hasOwn(metadata, 'protocol') && typeof metadata.protocol === 'string' ? metadata.protocol : null });
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};
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for (const block of chain.blocks) for (const raw of block.raws) visit(raw, block.height, block.hash);
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for (const raw of chain.mempool) visit(raw, null, null);
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}
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forProtocol(name) { return this.events.filter(e => e.protocol === name); }
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get protocols() { return [...new Set(this.events.filter(e => e.protocol !== null).map(e => e.protocol))].sort(); }
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get stats() { return { events: this.events.length, withMetadata: this.events.filter(e => e.hasMetadata).length,
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confirmed: this.events.filter(e => e.status === 'confirmed').length,
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pending: this.events.filter(e => e.status === 'pending').length, protocols: this.protocols }; }
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}
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// Trusted, application-bundled reducers only. Adding a plugin requires a code change/review.
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// No eval, dynamic imports, inscription scripts, or interpretation in MetadataIndex.
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const reducers = Object.freeze({
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'event-counter': events => events.reduce((state, event) => ({
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count: state.count + 1, confirmed: state.confirmed + Number(event.status === 'confirmed'),
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pending: state.pending + Number(event.status === 'pending'), ids: [...state.ids, event.id],
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}), { count: 0, confirmed: 0, pending: 0, ids: [] }),
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});
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export function deriveProtocol(index, protocol, reducerName) {
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if (!Object.hasOwn(reducers, reducerName)) throw new Error('Unknown trusted local reducer.');
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return reducers[reducerName](structuredClone(index.forProtocol(protocol)));
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}
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