V0.1.2 Merge to Main

client/getLatestFinalizedBlockNumber.js

@@ -0,0 +1,32 @@
+import { ApiPromise, WsProvider } from "@polkadot/api";
+import 'dotenv/config';
+
+const WS_ENDPOINT = process.env.WS_ENDPOINT;
+
+console.log("Connecting to blockchain...");
+const wsProvider = new WsProvider(WS_ENDPOINT);
+const api = await ApiPromise.create({ provider: wsProvider });
+
+/// The header has no block number because Xode chain is using 
+/// a custom header type that does not include a block number field.
+
+let headerBlockHash = await api.rpc.chain.getFinalizedHead();
+let block = await api.rpc.chain.getBlock(headerBlockHash);
+
+const parentHash = block.block.header.parentHash;
+const parentHeader = await api.rpc.chain.getHeader(parentHash);
+const blockNumber = parentHeader.number.toNumber() + 1;
+
+/// console.log("Latest Block Hash:", headerBlockHash.toHex());
+console.log("Finalized Block Number:", blockNumber);
+
+/// Other option in getting the latest finalized block number.
+/// Because system.number is a runtime storage item, not dependent 
+/// on header structure.
+
+const finalizedHash = await api.rpc.chain.getFinalizedHead();
+const bn = await api.query.system.number.at(finalizedHash);
+
+console.log("Finalized Block number:", bn.toNumber());
+
+process.exit(0);