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I know that some RPC query exist to get informations like : system_properties system_chain system_chainType

But I would like to have all of them in a same custom call. How I can access to those informations ?

Thank you.

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  • Can you clarify your question? You want to create a custom RPC which does those 3 queries at once?
    – Shawn Tabrizi
    Apr 28, 2022 at 9:27
  • @ShawnTabrizi yes that's it. do you have a suggestion ?
    – cibou
    Apr 29, 2022 at 6:06
  • You either need to make 3 RPC calls, or write your own custom RPC in Substrate which does all three at once. There is no "trick" here.
    – Shawn Tabrizi
    Apr 29, 2022 at 6:51
  • yes that is exactly what I want to do : write my one custom RPC but I dont know how to get those substrate informations given by system_syncState or system_properties ?
    – cibou
    May 1, 2022 at 19:16
  • @ShawnTabrizi do you have an idea ?
    – cibou
    May 2, 2022 at 16:39

1 Answer 1

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All of those RPCs can be found here: https://github.com/paritytech/substrate/blob/master/client/rpc/src/system/mod.rs

impl<B: traits::Block> SystemApi<B::Hash, <B::Header as HeaderT>::Number> for System<B> {

    // -- snip --

    fn system_properties(&self) -> Result<sc_chain_spec::Properties> {
        Ok(self.info.properties.clone())
    }

    // -- snip --

    fn system_sync_state(&self) -> Receiver<SyncState<<B::Header as HeaderT>::Number>> {
        let (tx, rx) = oneshot::channel();
        let _ = self.send_back.unbounded_send(Request::SyncState(tx));
        Receiver(rx)
    }

    // -- snip --
}

These are then implemented in the node's RPC configuration:

https://github.com/paritytech/substrate/blob/master/bin/node/rpc/src/lib.rs

io.extend_with(SystemApi::to_delegate(FullSystem::new(client.clone(), pool, deny_unsafe)));
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  • What I dont understand is that we declare instantiate with pub fn new( info: SystemInfo, send_back: TracingUnboundedSender<Request<B>>, deny_unsafe: DenyUnsafe, ) -> Self { System { info, send_back, deny_unsafe } } and we pass client.clone() for info in FullSystem::new(client.clone()
    – cibou
    Jul 11, 2022 at 8:25
  • What is the question? Do you want to open a new question?
    – Shawn Tabrizi
    Jul 11, 2022 at 9:13
  • I opened a new one
    – cibou
    Jul 11, 2022 at 13:11
  • this one : substrate.stackexchange.com/questions/3698/…
    – cibou
    Jul 12, 2022 at 9:18

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