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getFinalizedBlocks.ts
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getFinalizedBlocks.ts
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import { parseEndpoint } from '../shared/util.js';
import { FinalizedBlockInfo } from '@concordium/web-sdk';
import { ConcordiumGRPCNodeClient } from '@concordium/web-sdk/nodejs';
import { credentials } from '@grpc/grpc-js';
import meow from 'meow';
const cli = meow(
`
Usage
$ yarn run-example <path-to-this-file> [options]
Options
--help, -h Displays this message
--endpoint, -e Specify endpoint of the form "address:port", defaults to localhost:20000
`,
{
importMeta: import.meta,
flags: {
endpoint: {
type: 'string',
alias: 'e',
default: 'localhost:20000',
},
},
}
);
const [address, port] = parseEndpoint(cli.flags.endpoint);
const client = new ConcordiumGRPCNodeClient(
address,
Number(port),
credentials.createInsecure()
);
/*
* Returns a stream of finalized blocks that is iterable. The following code will receive
* blocks as long as there is a connection to the node:
*/
(async () => {
// #region documentation-snippet
// Get block stream
const blockStream: AsyncIterable<FinalizedBlockInfo> =
client.getFinalizedBlocks();
// Prints blocks infinitely
for await (const block of blockStream) {
console.log('Arrived block height:', block.height);
console.log('Arrived block hash:', block.hash, '\n');
}
// #endregion documentation-snippet
})();