Add duties service to validator

validator_client/src/duties/service.rs

@@ -0,0 +1,33 @@
+use super::traits::{BeaconNode, BeaconNodeError};
+use super::{DutiesManager, PollOutcome};
+use slog::{debug, error, info, warn, Logger};
+use slot_clock::SlotClock;
+use std::time::Duration;
+
+pub struct DutiesService<T: SlotClock, U: BeaconNode> {
+    pub manager: DutiesManager<T, U>,
+    pub poll_interval_millis: u64,
+    pub log: Logger,
+}
+
+impl<T: SlotClock, U: BeaconNode> DutiesService<T, U> {
+    pub fn run(&mut self) {
+        loop {
+            match self.manager.poll() {
+                Err(error) => {
+                    error!(self.log, "Epoch duties poll error"; "error" => format!("{:?}", error))
+                }
+                Ok(PollOutcome::NoChange) => debug!(self.log, "No change in duties"),
+                Ok(PollOutcome::DutiesChanged) => {
+                    info!(self.log, "Duties changed (potential re-org)")
+                }
+                Ok(PollOutcome::NewDuties) => info!(self.log, "New duties obtained"),
+                Ok(PollOutcome::UnknownValidatorOrEpoch) => {
+                    error!(self.log, "Epoch or validator unknown")
+                }
+            };
+
+            std::thread::sleep(Duration::from_millis(self.poll_interval_millis));
+        }
+    }
+}