Is there solutions for random message id?

[ghost]

I am working on p2p search engine, and every search request cannot be unique. In chat example message id is calculated with hash function:

let message_id_fn = |message: &gossipsub::Message| {
        let mut s = DefaultHasher::new();
        message.data.hash(&mut s);
        gossipsub::MessageId::from(s.finish().to_string())
};

So, what i should do? Maybe generate random string?

[dariusc93]

Assuming I am understanding your question, you can remove the config entry for computing the id so it would use the default which is located

rust-libp2p/protocols/gossipsub/src/config.rs

Lines 412 to 425 in c93f753

	message_id_fn: Arc::new(|message| {
	// default message id is: source + sequence number
	// NOTE: If either the peer_id or source is not provided, we set to 0;
	let mut source_string = if let Some(peer_id) = message.source.as_ref() {
	peer_id.to_base58()
	} else {
	PeerId::from_bytes(&[0, 1, 0])
	.expect("Valid peer id")
	.to_base58()
	};
	source_string
	.push_str(&message.sequence_number.unwrap_or_default().to_string());
	MessageId::from(source_string)
	}),

. You can also use your own logic to compute the id too but default should suffice.

[ghost]

Thank, it will be better than other solution(use timestamp)