Preparing light client structure [v2] (#150)

* light client structure + remote call requests

polkadot/cli/src/informant.rs

@@ -23,12 +23,18 @@ use tokio_core::reactor;
 use network::{SyncState, SyncProvider};
 use runtime_support::Hashable;
 use primitives::block::HeaderHash;
-use client::BlockchainEvents;
+use state_machine;
+use client::{self, BlockchainEvents};
 
 const TIMER_INTERVAL_MS: u64 = 5000;
 
 /// Spawn informant on the event loop
-pub fn start(service: &Service, handle: reactor::Handle) {
+pub fn start<B, E>(service: &Service<B, E>, handle: reactor::Handle)
+	where
+		B: client::backend::Backend + Send + Sync + 'static,
+		E: client::CallExecutor + Send + Sync + 'static,
+		client::error::Error: From<<<B as client::backend::Backend>::State as state_machine::backend::Backend>::Error>
+{
 	let interval = reactor::Interval::new_at(Instant::now(), Duration::from_millis(TIMER_INTERVAL_MS), &handle)
 		.expect("Error creating informant timer");