src/api/s3_cors.rs

@@ -200,12 +200,7 @@ pub fn find_matching_cors_rule<'a>(
 				None => vec![],
 			};
 			return Ok(cors_config.iter().find(|rule| {
-				cors_rule_matches(
-					rule,
-					origin,
-					&req.method().to_string(),
-					request_headers.iter(),
-				)
+				cors_rule_matches(rule, origin, req.method().as_ref(), request_headers.iter())
 			}));
 		}
 	}

src/api/s3_list.rs

@@ -1042,12 +1042,12 @@ mod tests {
 
 		query.common.prefix = "a/".to_string();
 		assert_eq!(
-			common_prefix(&objs.get(0).unwrap(), &query.common),
+			common_prefix(objs.get(0).unwrap(), &query.common),
 			Some("a/b/")
 		);
 
 		query.common.prefix = "a/b/".to_string();
-		assert_eq!(common_prefix(&objs.get(0).unwrap(), &query.common), None);
+		assert_eq!(common_prefix(objs.get(0).unwrap(), &query.common), None);
 	}
 
 	#[test]
@@ -1272,7 +1272,7 @@ mod tests {
 		Version {
 			bucket_id: uuid,
 			key: "a".to_string(),
-			uuid: uuid,
+			uuid,
 			deleted: false.into(),
 			blocks: crdt::Map::<VersionBlockKey, VersionBlock>::from_iter(blocks),
 			parts_etags: crdt::Map::<u64, String>::from_iter(etags),

src/api/s3_website.rs

@@ -259,8 +259,7 @@ impl RoutingRuleInner {
 		let has_prefix = self
 			.condition
 			.as_ref()
-			.map(|c| c.prefix.as_ref())
-			.flatten()
+			.and_then(|c| c.prefix.as_ref())
 			.is_some();
 		self.redirect.validate(has_prefix)
 	}

src/api/signature/payload.rs

@@ -51,7 +51,7 @@ pub async fn check_payload_signature(
 
 	let canonical_request = canonical_request(
 		request.method(),
-		&request.uri().path().to_string(),
+		request.uri().path(),
 		&canonical_query_string(request.uri()),
 		&headers,
 		&authorization.signed_headers,

src/garage/main.rs

@@ -115,7 +115,7 @@ async fn cli_command(opt: Opt) -> Result<(), Error> {
 	} else {
 		let node_id = garage_rpc::system::read_node_id(&config.as_ref().unwrap().metadata_dir)
 			.err_context(READ_KEY_ERROR)?;
-		if let Some(a) = config.as_ref().map(|c| c.rpc_public_addr).flatten() {
+		if let Some(a) = config.as_ref().and_then(|c| c.rpc_public_addr) {
 			(node_id, a)
 		} else {
 			let default_addr = SocketAddr::new(

src/garage/tests/bucket.rs

@@ -27,7 +27,7 @@ async fn test_bucket_all() {
 			.buckets
 			.as_ref()
 			.unwrap()
-			.into_iter()
+			.iter()
 			.filter(|x| x.name.as_ref().is_some())
 			.find(|x| x.name.as_ref().unwrap() == "hello")
 			.is_some());
@@ -79,7 +79,7 @@ async fn test_bucket_all() {
 			.buckets
 			.as_ref()
 			.unwrap()
-			.into_iter()
+			.iter()
 			.filter(|x| x.name.as_ref().is_some())
 			.find(|x| x.name.as_ref().unwrap() == "hello")
 			.is_none());

src/garage/tests/list.rs

@@ -527,8 +527,8 @@ async fn test_listmultipart() {
 			upnext = r.next_upload_id_marker;
 
 			loopcnt += 1;
-			upcnt += r.uploads.unwrap_or(vec![]).len();
-			pfxcnt += r.common_prefixes.unwrap_or(vec![]).len();
+			upcnt += r.uploads.unwrap_or_default().len();
+			pfxcnt += r.common_prefixes.unwrap_or_default().len();
 
 			if next.is_none() {
 				break;

src/garage/tests/multipart.rs

@@ -124,7 +124,7 @@ async fn test_uploadlistpart() {
 
 		assert!(r.part_number_marker.is_none());
 		assert!(r.next_part_number_marker.is_some());
-		assert_eq!(r.max_parts, 1 as i32);
+		assert_eq!(r.max_parts, 1_i32);
 		assert!(r.is_truncated);
 		assert_eq!(r.key.unwrap(), "a");
 		assert_eq!(r.upload_id.unwrap().as_str(), uid.as_str());
@@ -146,7 +146,7 @@ async fn test_uploadlistpart() {
 			r2.part_number_marker.as_ref().unwrap(),
 			r.next_part_number_marker.as_ref().unwrap()
 		);
-		assert_eq!(r2.max_parts, 1 as i32);
+		assert_eq!(r2.max_parts, 1_i32);
 		assert!(r2.is_truncated);
 		assert_eq!(r2.key.unwrap(), "a");
 		assert_eq!(r2.upload_id.unwrap().as_str(), uid.as_str());

src/model/block.rs

@@ -38,7 +38,6 @@ use crate::garage::Garage;
 /// Size under which data will be stored inlined in database instead of as files
 pub const INLINE_THRESHOLD: usize = 3072;
 
-pub const BACKGROUND_WORKERS: u64 = 1;
 pub const BACKGROUND_TRANQUILITY: u32 = 2;
 
 // Timeout for RPCs that read and write blocks to remote nodes
@@ -512,18 +511,15 @@ impl BlockManager {
 	// ---- Resync loop ----
 
 	pub fn spawn_background_worker(self: Arc<Self>) {
-		// Launch n simultaneous workers for background resync loop preprocessing
-		for i in 0..BACKGROUND_WORKERS {
-			let bm2 = self.clone();
+		// Launch a background workers for background resync loop processing
 		let background = self.system.background.clone();
 		tokio::spawn(async move {
-				tokio::time::sleep(Duration::from_secs(10 * (i + 1))).await;
-				background.spawn_worker(format!("block resync worker {}", i), move |must_exit| {
-					bm2.resync_loop(must_exit)
+			tokio::time::sleep(Duration::from_secs(10)).await;
+			background.spawn_worker("block resync worker".into(), move |must_exit| {
+				self.resync_loop(must_exit)
 			});
 		});
 	}
-	}
 
 	fn put_to_resync(&self, hash: &Hash, delay: Duration) -> Result<(), Error> {
 		let when = now_msec() + delay.as_millis() as u64;
@@ -566,9 +562,12 @@ impl BlockManager {
 	}
 
 	async fn resync_iter(&self, must_exit: &mut watch::Receiver<bool>) -> Result<bool, Error> {
-		if let Some((time_bytes, hash_bytes)) = self.resync_queue.pop_min()? {
+		if let Some(first_pair_res) = self.resync_queue.iter().next() {
+			let (time_bytes, hash_bytes) = first_pair_res?;
+
 			let time_msec = u64::from_be_bytes(time_bytes[0..8].try_into().unwrap());
 			let now = now_msec();
+
 			if now >= time_msec {
 				let hash = Hash::try_from(&hash_bytes[..]).unwrap();
 
@@ -579,6 +578,9 @@ impl BlockManager {
 						// don't do resync and return early, but still
 						// make sure the item is still in queue at expected time
 						self.put_to_resync_at(&hash, ec.next_try())?;
+						// ec.next_try() > now >= time_msec, so this remove
+						// is not removing the one we added just above
+						self.resync_queue.remove(time_bytes)?;
 						return Ok(false);
 					}
 				}
@@ -609,20 +611,25 @@ impl BlockManager {
 					warn!("Error when resyncing {:?}: {}", hash, e);
 
 					let err_counter = match self.resync_errors.get(hash.as_slice())? {
-						Some(ec) => ErrorCounter::decode(ec).add1(),
-						None => ErrorCounter::new(),
+						Some(ec) => ErrorCounter::decode(ec).add1(now + 1),
+						None => ErrorCounter::new(now + 1),
 					};
 
-					self.put_to_resync_at(&hash, err_counter.next_try())?;
 					self.resync_errors
 						.insert(hash.as_slice(), err_counter.encode())?;
+
+					self.put_to_resync_at(&hash, err_counter.next_try())?;
+					// err_counter.next_try() >= now + 1 > now,
+					// the entry we remove from the queue is not
+					// the entry we inserted with put_to_resync_at
+					self.resync_queue.remove(time_bytes)?;
 				} else {
 					self.resync_errors.remove(hash.as_slice())?;
+					self.resync_queue.remove(time_bytes)?;
 				}
 
 				Ok(true)
 			} else {
-				self.resync_queue.insert(time_bytes, hash_bytes)?;
 				let delay = tokio::time::sleep(Duration::from_millis(time_msec - now));
 				select! {
 					_ = delay.fuse() => {},
@@ -862,9 +869,11 @@ impl BlockManagerLocked {
 		let data = data.inner_buffer();
 
 		let mut path = mgr.block_dir(hash);
-		fs::create_dir_all(&path).await?;
-
+		let directory = path.clone();
 		path.push(hex::encode(hash));
+
+		fs::create_dir_all(&directory).await?;
+
 		let to_delete = match (mgr.is_block_compressed(hash).await, compressed) {
 			(Ok(true), _) => return Ok(BlockRpc::Ok),
 			(Ok(false), false) => return Ok(BlockRpc::Ok),
@@ -885,6 +894,7 @@ impl BlockManagerLocked {
 		path2.set_extension("tmp");
 		let mut f = fs::File::create(&path2).await?;
 		f.write_all(data).await?;
+		f.sync_all().await?;
 		drop(f);
 
 		fs::rename(path2, path).await?;
@@ -892,6 +902,19 @@ impl BlockManagerLocked {
 			fs::remove_file(to_delete).await?;
 		}
 
+		// We want to ensure that when this function returns, data is properly persisted
+		// to disk. The first step is the sync_all above that does an fsync on the data file.
+		// Now, we do an fsync on the containing directory, to ensure that the rename
+		// is persisted properly. See:
+		// http://thedjbway.b0llix.net/qmail/syncdir.html
+		let dir = fs::OpenOptions::new()
+			.read(true)
+			.mode(0)
+			.open(directory)
+			.await?;
+		dir.sync_all().await?;
+		drop(dir);
+
 		Ok(BlockRpc::Ok)
 	}
 
@@ -1037,19 +1060,13 @@ struct ErrorCounter {
 	last_try: u64,
 }
 
-impl Default for ErrorCounter {
-	fn default() -> Self {
+impl ErrorCounter {
+	fn new(now: u64) -> Self {
 		Self {
 			errors: 1,
-			last_try: now_msec(),
+			last_try: now,
 		}
 	}
-}
-
-impl ErrorCounter {
-	fn new() -> Self {
-		Self::default()
-	}
 
 	fn decode(data: sled::IVec) -> Self {
 		Self {
@@ -1065,10 +1082,10 @@ impl ErrorCounter {
 		.concat()
 	}
 
-	fn add1(self) -> Self {
+	fn add1(self, now: u64) -> Self {
 		Self {
 			errors: self.errors + 1,
-			last_try: now_msec(),
+			last_try: now,
 		}
 	}
 

src/model/helper/bucket.rs

@@ -30,8 +30,7 @@ impl<'a> BucketHelper<'a> {
 		// the AWS spec, and hex-encoded UUIDs are 64 chars long.
 		let hexbucket = hex::decode(bucket_name.as_str())
 			.ok()
-			.map(|by| Uuid::try_from(&by))
-			.flatten();
+			.and_then(|by| Uuid::try_from(&by));
 		if let Some(bucket_id) = hexbucket {
 			Ok(self
 				.0
@@ -46,8 +45,7 @@ impl<'a> BucketHelper<'a> {
 				.bucket_alias_table
 				.get(&EmptyKey, bucket_name)
 				.await?
-				.map(|x| *x.state.get())
-				.flatten())
+				.and_then(|x| *x.state.get()))
 		}
 	}
 

src/model/key_table.rs

@@ -106,8 +106,7 @@ impl Key {
 	/// Get permissions for a bucket
 	pub fn bucket_permissions(&self, bucket: &Uuid) -> BucketKeyPerm {
 		self.params()
-			.map(|params| params.authorized_buckets.get(bucket))
-			.flatten()
+			.and_then(|params| params.authorized_buckets.get(bucket))
 			.cloned()
 			.unwrap_or(BucketKeyPerm::NO_PERMISSIONS)
 	}

src/rpc/consul.rs

@@ -51,10 +51,8 @@ pub async fn get_consul_nodes(
 		let pubkey = ent
 			.node_meta
 			.get("pubkey")
-			.map(|k| hex::decode(&k).ok())
-			.flatten()
-			.map(|k| NodeID::from_slice(&k[..]))
-			.flatten();
+			.and_then(|k| hex::decode(&k).ok())
+			.and_then(|k| NodeID::from_slice(&k[..]));
 		if let (Some(ip), Some(pubkey)) = (ip, pubkey) {
 			ret.push((pubkey, SocketAddr::new(ip, ent.service_port)));
 		} else {

src/rpc/kubernetes.rs

@@ -63,10 +63,8 @@ pub async fn get_kubernetes_nodes(
 		let pubkey = &node
 			.metadata
 			.name
-			.map(|k| hex::decode(&k).ok())
-			.flatten()
-			.map(|k| NodeID::from_slice(&k[..]))
-			.flatten();
+			.and_then(|k| hex::decode(&k).ok())
+			.and_then(|k| NodeID::from_slice(&k[..]));
 
 		if let Some(pubkey) = pubkey {
 			ret.push((*pubkey, SocketAddr::new(node.spec.address, node.spec.port)))

src/rpc/rpc_helper.rs

@@ -322,8 +322,7 @@ impl RpcHelper {
 					let peer_avg_ping = peer_list
 						.iter()
 						.find(|x| x.id.as_ref() == to.as_slice())
-						.map(|pi| pi.avg_ping)
-						.flatten()
+						.and_then(|pi| pi.avg_ping)
 						.unwrap_or_else(|| Duration::from_secs(1));
 					(
 						to != self.0.our_node_id,

src/web/web_server.rs

@@ -175,8 +175,7 @@ async fn serve_file(garage: Arc<Garage>, req: &Request<Body>) -> Result<Response
 		.bucket_alias_table
 		.get(&EmptyKey, &bucket_name.to_string())
 		.await?
-		.map(|x| x.state.take())
-		.flatten()
+		.and_then(|x| x.state.take())
 		.ok_or(Error::NotFound)?;
 
 	// Check bucket isn't deleted and has website access enabled