Add full node vs archive node attribute

[0xprames]

https://x.com/pistomat_eth/status/1721551057724047809?s=20

[0xprames]

this needs some investigation - looking into this

[0xprames]

look like the one way (the only way?) to get this data currently is querying a node's RPC endpoint and querying for historical state

this seems not as fool-proof, but should be a good place to start.

this approach assumes:

• node's RPC (8545) is open for external use, which isn't always the case
• the query doesn't fail for any other reasons
• the historical state data is "legitimate" (not sybilled, spoofed etc)

[0xprames]

i think #14 may help here - but not sure, ive unassigned myself for now to leave this open for @alessandromazza98 to explore!

[alessandromazza98]

Yes, I can take it after #67

[alessandromazza98]

I'm looking right now into research for it.

Up to now my idea is just to use an RPC call to ask for some old state data with rpc calls such as:

• eth_getTransactionCount
• eth_getBalance

and some others.

this approach assumes:

• node's RPC (8545) is open for external use, which isn't always the case
• the query doesn't fail for any other reasons
• the historical state data is "legitimate" (not sybilled, spoofed etc)

It is the same approach. I actually don't like it a lot if I have to be honest because there are too many scenarios in which a node does not answer the rpc call...

But yeah, it's a first step

[alessandromazza98]

Testing the RPC approach... It doesn't look good right now.

You can have a look in this branch: https://github.com/Keep-Reth-Strange/reth-crawler/tree/ale/full-archive-nodes
Specifically this is the function that does the RPC call:

reth-crawler/bins/reth-crawler/src/crawler/listener/update_listener.rs

Lines 240 to 272 in 380eef0

	/// Trying to guess if a peer is running an archive or full node.
	///
	/// Note: this data can be sybilled.
	async fn is_archive(ip_addr: &str) -> eyre::Result<bool> {
	// try connecting to the peer
	println!("ENTER IS_ARCHIVE FN");
	let ip_addr = format!("{}:8545", ip_addr);
	let provider = Provider::try_from(ip_addr)?;
	match provider
	.get_balance(ACCOUNT, Some(TEN_MILION_BLOCK.into()))
	.await
	{
	Ok(_account_balance) => {
	println!("EXITING IS_ARCHIVE FN");
	Ok(true)
	}
	Err(err) => match err.as_error_response() {
	Some(err) => {
	if err.message.contains("Missing trie node") {
	println!("EXITING IS_ARCHIVE FN");
	Ok(false)
	} else {
	println!("EXITING IS_ARCHIVE FN");
	Err(eyre::eyre!("not able to get RPC response"))
	}
	}
	None => {
	println!("EXITING IS_ARCHIVE FN");
	Err(eyre::eyre!("not able to get RPC response"))
	}
	},
	}
	}

I'm just testing with a eth_getBalance RPC call, asking for the balance of a random address (that has balance != 0) at 10_000_000 block

The problem I'm facing is that all (at least for now) peers doesn't have the RPC 8545 port opened and so I'm not able to get the information if they are archive or full. They enter the first few lines of the is_archive fn and then they return when provider tries to connect with the node through http.