Implement getting missing blocks when RC increases

Issue: RC increases also when the block ref entry is first put by the actual client.
At that point the client is probably already sending us the block content,
so we don't need to do a get...
We should add a delay before the task is added or find something to do.

src/table.rs

@@ -4,9 +4,9 @@ use std::time::Duration;
 
 use async_trait::async_trait;
 use futures::stream::*;
-use tokio::sync::RwLock;
 use serde::{Deserialize, Serialize};
 use serde_bytes::ByteBuf;
+use tokio::sync::RwLock;
 
 use crate::data::*;
 use crate::error::Error;
@@ -316,7 +316,10 @@ impl<F: TableSchema + 'static> Table<F> {
 				return Ok(rmp_serde::decode::from_read_ref(&rep_by)?);
 			}
 		}
-		Err(Error::Message(format!("Invalid reply to TableRPC: {:?}", resp)))
+		Err(Error::Message(format!(
+			"Invalid reply to TableRPC: {:?}",
+			resp
+		)))
 	}
 
 	async fn handle(self: &Arc<Self>, msg: TableRPC<F>) -> Result<TableRPC<F>, Error> {
@@ -331,7 +334,9 @@ impl<F: TableSchema + 'static> Table<F> {
 			}
 			TableRPC::SyncChecksums(checksums) => {
 				let syncer = self.syncer.read().await.as_ref().unwrap().clone();
-				let differing = syncer.handle_checksum_rpc(&checksums[..], self.system.background.stop_signal.clone()).await?;
+				let differing = syncer
+					.handle_checksum_rpc(&checksums[..], self.system.background.stop_signal.clone())
+					.await?;
 				Ok(TableRPC::SyncDifferentSet(differing))
 			}
 			_ => Err(Error::RPCError(format!("Unexpected table RPC"))),