Adding info messages on mined blocks (#1127)

miner/src/miner.rs

@@ -459,15 +459,18 @@ impl MinerService for Miner {
 		if let Some(b) = self.sealing_work.lock().unwrap().take_used_if(|b| &b.hash() == &pow_hash) {
 			match chain.try_seal(b.lock(), seal) {
 				Err(_) => {
+					info!(target: "miner", "Mined block rejected, PoW was invalid.");
 					Err(Error::PowInvalid)
 				}
 				Ok(sealed) => {
+					info!(target: "miner", "New block mined, hash: {}", sealed.header().hash());
 					// TODO: commit DB from `sealed.drain` and make a VerifiedBlock to skip running the transactions twice.
 					try!(chain.import_block(sealed.rlp_bytes()));
 					Ok(())
 				}
 			}
 		} else {
+			info!(target: "miner", "Mined block rejected, PoW hash invalid or out of date.");
 			Err(Error::PowHashInvalid)
 		}
 	}