feat(rpc): add eth_syncing implementation (#1859)

crates/net/network-api/src/lib.rs

@@ -40,6 +40,9 @@ pub trait NetworkInfo: Send + Sync {
 
     /// Returns the chain id
     fn chain_id(&self) -> u64;
+
+    /// Returns `true` if the network is undergoing sync.
+    fn is_syncing(&self) -> bool;
 }
 
 /// Provides general purpose information about Peers in the network.

crates/net/network-api/src/test_utils.rs

@@ -35,6 +35,10 @@ impl NetworkInfo for NoopNetwork {
     fn chain_id(&self) -> u64 {
         Mainnet.into()
     }
+
+    fn is_syncing(&self) -> bool {
+        false
+    }
 }
 
 impl PeersInfo for NoopNetwork {

crates/net/network/src/network.rs

@@ -229,6 +229,10 @@ impl NetworkInfo for NetworkHandle {
     fn chain_id(&self) -> u64 {
         self.inner.chain_id.load(Ordering::Relaxed)
     }
+
+    fn is_syncing(&self) -> bool {
+        SyncStateProvider::is_syncing(self)
+    }
 }
 
 impl StatusUpdater for NetworkHandle {