state_getMetadata - Moonbeam RPC Method

async function explorePallets(api) {
  const metadata = await api.rpc.state.getMetadata();
  const pallets = metadata.asLatest.pallets;

  for (const pallet of pallets) {
    const name = pallet.name.toString();
    const hasCalls = pallet.calls.isSome;
    const hasStorage = pallet.storage.isSome;
    const hasEvents = pallet.events.isSome;

    console.log(`${name}: calls=${hasCalls} storage=${hasStorage} events=${hasEvents}`);
  }
}

import { xxhashAsHex } from '@polkadot/util-crypto';

function buildStorageKey(palletName, storageName) {
  const palletHash = xxhashAsHex(palletName, 128);
  const storageHash = xxhashAsHex(storageName, 128);

  return palletHash + storageHash.slice(2); // Concatenate without duplicate 0x
}

// Example: Build key for System.Account storage
const key = buildStorageKey('System', 'Account');
console.log('Storage prefix key:', key);

async function compareMetadataVersions(api, blockA, blockB) {
  const hashA = await api.rpc.chain.getBlockHash(blockA);
  const hashB = await api.rpc.chain.getBlockHash(blockB);

  const metaA = await api.rpc.state.getMetadata(hashA);
  const metaB = await api.rpc.state.getMetadata(hashB);

  const palletsA = new Set(metaA.asLatest.pallets.map(p => p.name.toString()));
  const palletsB = new Set(metaB.asLatest.pallets.map(p => p.name.toString()));

  const added = [...palletsB].filter(p => !palletsA.has(p));
  const removed = [...palletsA].filter(p => !palletsB.has(p));

  console.log('Added pallets:', added);
  console.log('Removed pallets:', removed);
}