Snapshot sync (#2047)

* PV64 sync

* Tests

* Client DB restore

* Snapshot restoration over IPC

* Upating test

* Minor tweaks

* Upating test

rpc/src/v1/impls/eth.rs

@@ -254,7 +254,8 @@ impl<C, S: ?Sized, M, EM> Eth for EthClient<C, S, M, EM> where
 		let status = take_weak!(self.sync).status();
 		let res = match status.state {
 			SyncState::Idle => SyncStatus::None,
-			SyncState::Waiting | SyncState::Blocks | SyncState::NewBlocks | SyncState::ChainHead => {
+			SyncState::Waiting | SyncState::Blocks | SyncState::NewBlocks | SyncState::ChainHead
+				| SyncState::SnapshotManifest | SyncState::SnapshotData | SyncState::SnapshotWaiting => {
 				let current_block = U256::from(take_weak!(self.client).chain_info().best_block_number);
 				let highest_block = U256::from(status.highest_block_number.unwrap_or(status.start_block_number));
 

rpc/src/v1/tests/helpers/sync_provider.rs

@@ -49,6 +49,8 @@ impl TestSyncProvider {
 				num_peers: config.num_peers,
 				num_active_peers: 0,
 				mem_used: 0,
+				num_snapshot_chunks: 0,
+				snapshot_chunks_done: 0,
 			}),
 		}
 	}