Implement skeleton network/sync framework.

beacon_node/sync/src/lib.rs

@@ -3,8 +3,9 @@
 /// Stores the various syncing methods for the beacon chain.
 mod simple_sync;
 
-pub use crate::SimpleSync;
+pub use simple_sync::SimpleSync;
 
+/// Currently implemented sync methods.
 pub enum SyncMethod {
     SimpleSync,
 }

beacon_node/sync/src/simple_sync.rs

@@ -1,10 +1,11 @@
+use libp2p::PeerId;
 use std::collections::HashMap;
-use types::{Slot, H256};
+use types::{Hash256, Slot};
 
 /// Keeps track of syncing information for known connected peers.
 pub struct PeerSyncInfo {
     best_slot: Slot,
-    best_slot_hash: H256,
+    best_slot_hash: Hash256,
 }
 
 /// The current syncing state.
@@ -16,7 +17,17 @@ pub enum SyncState {
 
 /// Simple Syncing protocol.
 pub struct SimpleSync {
-    genesis_hash: H256,
+    genesis_hash: Hash256,
     known_peers: HashMap<PeerId, PeerSyncInfo>,
     state: SyncState,
 }
+
+impl SimpleSync {
+    pub fn new(genesis_hash: Hash256) -> Self {
+        SimpleSync {
+            genesis_hash,
+            known_peers: HashMap::new(),
+            state: SyncState::Idle,
+        }
+    }
+}