fix clippy warnings on util and rpc

src/rpc/lib.rs

@@ -1,3 +1,4 @@
+#![allow(clippy::upper_case_acronyms)]
 //! Crate containing rpc related functions and types used in Garage
 
 #[macro_use]

src/rpc/membership.rs

@@ -3,7 +3,7 @@ use std::collections::HashMap;
 use std::fmt::Write as FmtWrite;
 use std::io::{Read, Write};
 use std::net::{IpAddr, SocketAddr};
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::Arc;
 use std::time::Duration;
@@ -198,15 +198,15 @@ impl Status {
 	}
 }
 
-fn gen_node_id(metadata_dir: &PathBuf) -> Result<UUID, Error> {
-	let mut id_file = metadata_dir.clone();
+fn gen_node_id(metadata_dir: &Path) -> Result<UUID, Error> {
+	let mut id_file = metadata_dir.to_path_buf();
 	id_file.push("node_id");
 	if id_file.as_path().exists() {
 		let mut f = std::fs::File::open(id_file.as_path())?;
 		let mut d = vec![];
 		f.read_to_end(&mut d)?;
 		if d.len() != 32 {
-			return Err(Error::Message(format!("Corrupt node_id file")));
+			return Err(Error::Message("Corrupt node_id file".to_string()));
 		}
 
 		let mut id = [0u8; 32];
@@ -256,7 +256,7 @@ impl System {
 		let state_info = StateInfo {
 			hostname: gethostname::gethostname()
 				.into_string()
-				.unwrap_or("<invalid utf-8>".to_string()),
+				.unwrap_or_else(|_| "<invalid utf-8>".to_string()),
 		};
 
 		let ring = Ring::new(net_config);
@@ -296,12 +296,12 @@ impl System {
 				match msg {
 					Message::Ping(ping) => self2.handle_ping(&addr, &ping).await,
 
-					Message::PullStatus => self2.handle_pull_status(),
-					Message::PullConfig => self2.handle_pull_config(),
+					Message::PullStatus => Ok(self2.handle_pull_status()),
+					Message::PullConfig => Ok(self2.handle_pull_config()),
 					Message::AdvertiseNodesUp(adv) => self2.handle_advertise_nodes_up(&adv).await,
 					Message::AdvertiseConfig(adv) => self2.handle_advertise_config(&adv).await,
 
-					_ => Err(Error::BadRPC(format!("Unexpected RPC message"))),
+					_ => Err(Error::BadRPC("Unexpected RPC message".to_string())),
 				}
 			}
 		});
@@ -358,13 +358,13 @@ impl System {
 	) {
 		let self2 = self.clone();
 		self.background
-			.spawn_worker(format!("discovery loop"), |stop_signal| {
+			.spawn_worker("discovery loop".to_string(), |stop_signal| {
 				self2.discovery_loop(peers, consul_host, consul_service_name, stop_signal)
 			});
 
 		let self2 = self.clone();
 		self.background
-			.spawn_worker(format!("ping loop"), |stop_signal| {
+			.spawn_worker("ping loop".to_string(), |stop_signal| {
 				self2.ping_loop(stop_signal)
 			});
 	}
@@ -424,7 +424,6 @@ impl System {
 						warn!("Node {:?} seems to be down.", id);
 						if !ring.config.members.contains_key(id) {
 							info!("Removing node {:?} from status (not in config and not responding to pings anymore)", id);
-							drop(st);
 							status.nodes.remove(&id);
 							has_changes = true;
 						}
@@ -438,7 +437,7 @@ impl System {
 		self.update_status(&update_locked, status).await;
 		drop(update_locked);
 
-		if to_advertise.len() > 0 {
+		if !to_advertise.is_empty() {
 			self.broadcast(Message::AdvertiseNodesUp(to_advertise), PING_TIMEOUT)
 				.await;
 		}
@@ -474,15 +473,13 @@ impl System {
 		Ok(self.make_ping())
 	}
 
-	fn handle_pull_status(&self) -> Result<Message, Error> {
-		Ok(Message::AdvertiseNodesUp(
-			self.status.borrow().to_serializable_membership(self),
-		))
+	fn handle_pull_status(&self) -> Message {
+		Message::AdvertiseNodesUp(self.status.borrow().to_serializable_membership(self))
 	}
 
-	fn handle_pull_config(&self) -> Result<Message, Error> {
+	fn handle_pull_config(&self) -> Message {
 		let ring = self.ring.borrow().clone();
-		Ok(Message::AdvertiseConfig(ring.config.clone()))
+		Message::AdvertiseConfig(ring.config.clone())
 	}
 
 	async fn handle_advertise_nodes_up(
@@ -530,7 +527,7 @@ impl System {
 		self.update_status(&update_lock, status).await;
 		drop(update_lock);
 
-		if to_ping.len() > 0 {
+		if !to_ping.is_empty() {
 			self.background
 				.spawn_cancellable(self.clone().ping_nodes(to_ping).map(Ok));
 		}
@@ -576,8 +573,8 @@ impl System {
 			self.clone().ping_nodes(ping_addrs).await;
 
 			select! {
-				_ = restart_at.fuse() => (),
-				_ = stop_signal.changed().fuse() => (),
+				_ = restart_at.fuse() => {},
+				_ = stop_signal.changed().fuse() => {},
 			}
 		}
 	}
@@ -595,7 +592,7 @@ impl System {
 		};
 
 		while !*stop_signal.borrow() {
-			let not_configured = self.ring.borrow().config.members.len() == 0;
+			let not_configured = self.ring.borrow().config.members.is_empty();
 			let no_peers = self.status.borrow().nodes.len() < 3;
 			let bad_peers = self
 				.status
@@ -613,12 +610,9 @@ impl System {
 					.map(|ip| (*ip, None))
 					.collect::<Vec<_>>();
 
-				match self.persist_status.load_async().await {
-					Ok(peers) => {
+				if let Ok(peers) = self.persist_status.load_async().await {
 					ping_list.extend(peers.iter().map(|x| (x.addr, Some(x.id))));
 				}
-					_ => (),
-				}
 
 				if let Some((consul_host, consul_service_name)) = &consul_config {
 					match get_consul_nodes(consul_host, consul_service_name).await {
@@ -636,12 +630,14 @@ impl System {
 
 			let restart_at = tokio::time::sleep(DISCOVERY_INTERVAL);
 			select! {
-				_ = restart_at.fuse() => (),
-				_ = stop_signal.changed().fuse() => (),
+				_ = restart_at.fuse() => {},
+				_ = stop_signal.changed().fuse() => {},
 			}
 		}
 	}
 
+	// for some reason fixing this is causing compilation error, see https://github.com/rust-lang/rust-clippy/issues/7052
+	#[allow(clippy::manual_async_fn)]
 	fn pull_status(
 		self: Arc<Self>,
 		peer: UUID,
@@ -672,18 +668,15 @@ impl System {
 			let mut list = status.to_serializable_membership(&self);
 
 			// Combine with old peer list to make sure no peer is lost
-			match self.persist_status.load_async().await {
-				Ok(old_list) => {
+			if let Ok(old_list) = self.persist_status.load_async().await {
 				for pp in old_list {
 					if !list.iter().any(|np| pp.id == np.id) {
 						list.push(pp);
 					}
 				}
 			}
-				_ => (),
-			}
 
-			if list.len() > 0 {
+			if !list.is_empty() {
 				info!("Persisting new peer list ({} peers)", list.len());
 				self.persist_status
 					.save_async(&list)

src/rpc/ring.rs

@@ -141,8 +141,7 @@ impl Ring {
 						if i_round >= node_info.capacity {
 							continue;
 						}
-						for pos2 in *pos..q.len() {
-							let qv = q[pos2];
+						for (pos2, &qv) in q.iter().enumerate().skip(*pos) {
 							if partitions[qv].len() != rep {
 								continue;
 							}
@@ -205,7 +204,7 @@ impl Ring {
 		for (i, entry) in self.ring.iter().enumerate() {
 			ret.push((i as u16, entry.location));
 		}
-		if ret.len() > 0 {
+		if !ret.is_empty() {
 			assert_eq!(ret[0].1, [0u8; 32].into());
 		}
 
@@ -234,6 +233,6 @@ impl Ring {
 		assert_eq!(partition_top & PARTITION_MASK_U16, top & PARTITION_MASK_U16);
 
 		assert!(n <= partition.nodes.len());
-		partition.nodes[..n].iter().cloned().collect::<Vec<_>>()
+		partition.nodes[..n].to_vec()
 	}
 }

src/rpc/rpc_client.rs

@@ -240,7 +240,7 @@ impl<M: RpcMessage> RpcAddrClient<M> {
 	pub fn new(http_client: Arc<RpcHttpClient>, path: String) -> Self {
 		Self {
 			phantom: PhantomData::default(),
-			http_client: http_client,
+			http_client,
 			path,
 		}
 	}

src/rpc/rpc_server.rs

@@ -57,7 +57,7 @@ where
 	trace!(
 		"Request message: {}",
 		serde_json::to_string(&msg)
-			.unwrap_or("<json error>".into())
+			.unwrap_or_else(|_| "<json error>".into())
 			.chars()
 			.take(100)
 			.collect::<String>()
@@ -123,7 +123,7 @@ impl RpcServer {
 		req: Request<Body>,
 		addr: SocketAddr,
 	) -> Result<Response<Body>, Error> {
-		if req.method() != &Method::POST {
+		if req.method() != Method::POST {
 			let mut bad_request = Response::default();
 			*bad_request.status_mut() = StatusCode::BAD_REQUEST;
 			return Ok(bad_request);
@@ -201,7 +201,7 @@ impl RpcServer {
 					.get_ref()
 					.0
 					.peer_addr()
-					.unwrap_or(([0, 0, 0, 0], 0).into());
+					.unwrap_or_else(|_| ([0, 0, 0, 0], 0).into());
 				let self_arc = self_arc.clone();
 				async move {
 					Ok::<_, Error>(service_fn(move |req: Request<Body>| {

src/util/data.rs

@@ -72,7 +72,7 @@ impl FixedBytes32 {
 		&mut self.0[..]
 	}
 	/// Copy to a slice
-	pub fn to_vec(&self) -> Vec<u8> {
+	pub fn to_vec(self) -> Vec<u8> {
 		self.0.to_vec()
 	}
 	/// Try building a FixedBytes32 from a slice

src/util/error.rs

@@ -93,12 +93,12 @@ impl From<sled::transaction::TransactionError<Error>> for Error {
 
 impl<T> From<tokio::sync::watch::error::SendError<T>> for Error {
 	fn from(_e: tokio::sync::watch::error::SendError<T>) -> Error {
-		Error::Message(format!("Watch send error"))
+		Error::Message("Watch send error".to_string())
 	}
 }
 
 impl<T> From<tokio::sync::mpsc::error::SendError<T>> for Error {
 	fn from(_e: tokio::sync::mpsc::error::SendError<T>) -> Error {
-		Error::Message(format!("MPSC send error"))
+		Error::Message("MPSC send error".to_string())
 	}
 }

src/util/lib.rs

@@ -1,3 +1,4 @@
+#![allow(clippy::upper_case_acronyms)]
 //! Crate containing common functions and types used in Garage
 
 #[macro_use]

src/util/persister.rs

@@ -1,5 +1,5 @@
 use std::io::{Read, Write};
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 
 use tokio::io::{AsyncReadExt, AsyncWriteExt};
 
@@ -18,8 +18,8 @@ impl<T> Persister<T>
 where
 	T: Serialize + for<'de> Deserialize<'de>,
 {
-	pub fn new(base_dir: &PathBuf, file_name: &str) -> Self {
-		let mut path = base_dir.clone();
+	pub fn new(base_dir: &Path, file_name: &str) -> Self {
+		let mut path = base_dir.to_path_buf();
 		path.push(file_name);
 		Self {
 			path,