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getAncestors.ts
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getAncestors.ts
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import { parseEndpoint } from '../shared/util.js';
import { BlockHash } 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]
Required
--max-ancestors, -m Maximum amount of ancestors to get
Options
--help, Displays this message
--block, -b A block to query from, defaults to last final block
--endpoint, -e Specify endpoint of the form "address:port", defaults to localhost:20000
`,
{
importMeta: import.meta,
flags: {
maxAncestors: {
type: 'number',
alias: 'm',
isRequired: true,
},
block: {
type: 'string',
alias: 'b',
},
endpoint: {
type: 'string',
alias: 'e',
default: 'localhost:20000',
},
},
}
);
const [address, port] = parseEndpoint(cli.flags.endpoint);
const client = new ConcordiumGRPCNodeClient(
address,
Number(port),
credentials.createInsecure()
);
/**
* Retrieves all ancestors that exists in the state at the end of a given block,
* as an async iterable of hex strings. A bigint representing the max number
* of ancestors to get must be provided. If a blockhash is not supplied it
* will pick the latest finalized block. An optional abortSignal can also be
* provided that closes the stream.
* Note: A stream can be collected to a list with the streamToList function.
*/
(async () => {
// #region documentation-snippet
const blockHash =
cli.flags.block === undefined
? undefined
: BlockHash.fromHexString(cli.flags.block);
const ancestors: AsyncIterable<BlockHash.Type> = client.getAncestors(
BigInt(cli.flags.maxAncestors),
blockHash
);
// #endregion documentation-snippet
console.log('Block hashes of ancestors of input block:');
for await (const ancestor of ancestors) {
console.log(ancestor);
}
})();