ckb-network 1.2.0

ckb network module
Documentation 
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use crate::NetworkState;
use ckb_logger::debug;
use futures::Future;
use std::{
    pin::Pin,
    sync::Arc,
    task::{Context, Poll},
    time::Duration,
};

const DEFAULT_DUMP_INTERVAL: Duration = Duration::from_secs(3600); // 1 hour

/// Save current peer store data regularly
pub struct DumpPeerStoreService {
    network_state: Arc<NetworkState>,
    interval: Option<p2p::runtime::Interval>,
}

impl DumpPeerStoreService {
    pub fn new(network_state: Arc<NetworkState>) -> Self {
        DumpPeerStoreService {
            network_state,
            interval: None,
        }
    }

    #[cfg(not(target_family = "wasm"))]
    fn dump_peer_store(&self) {
        let path = self.network_state.config.peer_store_path();
        self.network_state.with_peer_store_mut(|peer_store| {
            if let Err(err) = peer_store.dump_to_dir(&path) {
                ckb_logger::warn!("Dump peer store error, path: {:?} error: {}", path, err);
            } else {
                debug!("Dump peer store to {:?}", path);
            }
        });
    }

    #[cfg(target_family = "wasm")]
    fn dump_peer_store(&self) {
        let path = self.network_state.config.peer_store_path();
        self.network_state.with_peer_store_mut(|peer_store| {
            let task = peer_store.dump_to_idb(path);
            p2p::runtime::spawn(task)
        });
    }
}

impl Drop for DumpPeerStoreService {
    fn drop(&mut self) {
        debug!("Dump peer store before exiting");
        self.dump_peer_store();
        #[cfg(target_family = "wasm")]
        {
            use crate::peer_store::browser::get_db;
            let path = self.network_state.config.peer_store_path();
            p2p::runtime::spawn(async {
                let _ignore = get_db(path).await.shutdown().await;
            });
        }
    }
}

impl Future for DumpPeerStoreService {
    type Output = ();

    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
        use futures::StreamExt;
        if self.interval.is_none() {
            self.interval = {
                let mut interval =
                    p2p::runtime::Interval::new_at(DEFAULT_DUMP_INTERVAL, DEFAULT_DUMP_INTERVAL);
                // The outbound service does not need to urgently compensate for the missed wake,
                // just skip behavior is enough
                interval.set_missed_tick_behavior(p2p::runtime::MissedTickBehavior::Skip);
                Some(interval)
            }
        }
        while self
            .interval
            .as_mut()
            .unwrap()
            .poll_next_unpin(cx)
            .is_ready()
        {
            self.dump_peer_store()
        }
        Poll::Pending
    }
}