Update notifier to stable futures

beacon_node/client/src/builder.rs

@@ -366,13 +366,17 @@ where
             .ok_or_else(|| "slot_notifier requires a chain spec".to_string())?
             .milliseconds_per_slot;
 
-        let exit_channel = spawn_notifier(
-            context,
-            beacon_chain,
-            network_globals,
-            milliseconds_per_slot,
-        )
-        .map_err(|e| format!("Unable to start slot notifier: {}", e))?;
+        let exit_channel = context
+            .runtime_handle
+            .enter(|| {
+                spawn_notifier(
+                    beacon_chain,
+                    network_globals,
+                    milliseconds_per_slot,
+                    context.log.clone(),
+                )
+            })
+            .map_err(|e| format!("Unable to start slot notifier: {}", e))?;
 
         self.exit_channels.push(exit_channel);
 

beacon_node/client/src/notifier.rs

@@ -1,14 +1,12 @@
 use crate::metrics;
 use beacon_chain::{BeaconChain, BeaconChainTypes};
-use environment::RuntimeContext;
 use eth2_libp2p::NetworkGlobals;
-use futures::{Future, Stream};
+use futures::prelude::*;
 use parking_lot::Mutex;
 use slog::{debug, error, info, warn};
 use slot_clock::SlotClock;
 use std::sync::Arc;
 use std::time::{Duration, Instant};
-use tokio::timer::Interval;
 use types::{EthSpec, Slot};
 
 /// Create a warning log whenever the peer count is at or below this value.
@@ -27,15 +25,11 @@ const SPEEDO_OBSERVATIONS: usize = 4;
 
 /// Spawns a notifier service which periodically logs information about the node.
 pub fn spawn_notifier<T: BeaconChainTypes>(
-    context: RuntimeContext<T::EthSpec>,
     beacon_chain: Arc<BeaconChain<T>>,
     network: Arc<NetworkGlobals<T::EthSpec>>,
     milliseconds_per_slot: u64,
+    log: slog::Logger,
 ) -> Result<tokio::sync::oneshot::Sender<()>, String> {
-    let log_1 = context.log.clone();
-    let log_2 = context.log.clone();
-    let log_3 = context.log.clone();
-
     let slot_duration = Duration::from_millis(milliseconds_per_slot);
     let duration_to_next_slot = beacon_chain
         .slot_clock
@@ -43,29 +37,26 @@ pub fn spawn_notifier<T: BeaconChainTypes>(
         .ok_or_else(|| "slot_notifier unable to determine time to next slot")?;
 
     // Run this half way through each slot.
-    let start_instant = Instant::now() + duration_to_next_slot + (slot_duration / 2);
+    let start_instant = tokio::time::Instant::now() + duration_to_next_slot + (slot_duration / 2);
 
     // Run this each slot.
     let interval_duration = slot_duration;
 
     let speedo = Mutex::new(Speedo::default());
+    let interval = tokio::time::interval_at(start_instant, interval_duration);
 
-    let interval_future = Interval::new(start_instant, interval_duration)
-        .map_err(
-            move |e| error!(log_1, "Slot notifier timer failed"; "error" => format!("{:?}", e)),
-        )
-        .for_each(move |_| {
-            let log = log_2.clone();
-
+    let interval_future = async move {
+        while let Some(_) = interval.next().await {
             let connected_peer_count = network.connected_peers();
             let sync_state = network.sync_state();
 
-            let head_info = beacon_chain.head_info()
-                .map_err(|e| error!(
+            let head_info = beacon_chain.head_info().map_err(|e| {
+                error!(
                     log,
                     "Failed to get beacon chain head info";
                     "error" => format!("{:?}", e)
-                ))?;
+                )
+            })?;
 
             let head_slot = head_info.slot;
             let current_slot = beacon_chain.slot().map_err(|e| {
@@ -83,7 +74,10 @@ pub fn spawn_notifier<T: BeaconChainTypes>(
             let mut speedo = speedo.lock();
             speedo.observe(head_slot, Instant::now());
 
-            metrics::set_gauge(&metrics::SYNC_SLOTS_PER_SECOND, speedo.slots_per_second().unwrap_or_else(|| 0_f64) as i64);
+            metrics::set_gauge(
+                &metrics::SYNC_SLOTS_PER_SECOND,
+                speedo.slots_per_second().unwrap_or_else(|| 0_f64) as i64,
+            );
 
             // The next two lines take advantage of saturating subtraction on `Slot`.
             let head_distance = current_slot - head_slot;
@@ -101,10 +95,9 @@ pub fn spawn_notifier<T: BeaconChainTypes>(
                 "head_block" => format!("{}", head_root),
                 "head_slot" => head_slot,
                 "current_slot" => current_slot,
-                "sync_state" =>format!("{}", sync_state) 
+                "sync_state" =>format!("{}", sync_state)
             );
 
-
             // Log if we are syncing
             if sync_state.is_syncing() {
                 let distance = format!(
@@ -122,9 +115,13 @@ pub fn spawn_notifier<T: BeaconChainTypes>(
                 );
             } else {
                 if sync_state.is_synced() {
-                    let block_info = if current_slot > head_slot { format!("   …  empty") } else { format!("{}", head_root) };
+                    let block_info = if current_slot > head_slot {
+                        format!("   …  empty")
+                    } else {
+                        format!("{}", head_root)
+                    };
                     info!(
-                        log_2,
+                        log,
                         "Synced";
                         "peers" => peer_count_pretty(connected_peer_count),
                         "finalized_root" => format!("{}", finalized_root),
@@ -135,7 +132,7 @@ pub fn spawn_notifier<T: BeaconChainTypes>(
                     );
                 } else {
                     info!(
-                        log_2,
+                        log,
                         "Searching for peers";
                         "peers" => peer_count_pretty(connected_peer_count),
                         "finalized_root" => format!("{}", finalized_root),
@@ -145,25 +142,14 @@ pub fn spawn_notifier<T: BeaconChainTypes>(
                     );
                 }
             }
-            Ok(())
-        })
-        .then(move |result| {
-            match result {
-                Ok(()) => Ok(()),
-                Err(e) => {
-                    error!(
-                    log_3,
-                    "Notifier failed to notify";
-                    "error" => format!("{:?}", e)
-                );
-                Ok(())
-            } } });
+        }
+        Ok::<(), ()>(())
+    };
 
     let (exit_signal, exit) = tokio::sync::oneshot::channel();
 
-    context
-        .executor
-        .spawn(interval_future.select(exit).map(|_| ()).map_err(|_| ()));
+    // run the notifier on the current executor
+    tokio::spawn(futures::future::select(Box::pin(interval_future), exit));
 
     Ok(exit_signal)
 }

lcli/src/generate_bootnode_enr.rs

@@ -3,7 +3,6 @@ use eth2_libp2p::{
     discovery::{build_enr, CombinedKey, CombinedKeyExt, Keypair, ENR_FILENAME},
     NetworkConfig, NETWORK_KEY_FILENAME,
 };
-use std::convert::TryInto;
 use std::fs;
 use std::fs::File;
 use std::io::Write;