1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

use futures::future::join_all;

use crate::identifier::Identifier;

use super::MechanicsError;

impl Identifier {
    pub async fn notify_witnesses(&mut self) -> Result<usize, MechanicsError> {
        let mut n = 0;
        let to_notify = self.to_notify.iter().filter_map(|ev| {
            // Elect the leader
            // Leader is identifier with minimal index among all participants who
            // sign event. He will send message to witness.
            let id_idx = self.get_index(&ev.event_message.data).unwrap_or_default();
            let min_sig_idx =
                ev.signatures
                    .iter()
                    .map(|at| at.index.current())
                    .min()
                    .expect("event should have at least one signature") as usize;
            if min_sig_idx == id_idx {
                let witnesses = self
                    .known_events
                    .find_witnesses_at_event(&ev.event_message)
                    .expect("Can't find witnesses");
                n += 1;
                Some(self.communication.publish(witnesses, &ev))
            } else {
                None
            }
        });
        join_all(to_notify).await;
        self.to_notify.clear();

        Ok(n)
    }
}