Fix: clippy warning in rust 1.66.0

7 files changed, 125 insertions, 149 deletions

diff --git a/src/common.rs b/src/common.rs
index e5171b7..9ea4a1e 100644
--- a/src/common.rs
+++ b/src/common.rs
@@ -12,15 +12,17 @@ use std::{
     time::{Instant, SystemTime},
 };
 
+#[allow(dead_code)]
 pub(crate) fn get_expired_time() -> Instant {
     let now = Instant::now();
     now.checked_sub(std::time::Duration::from_secs(3600))
         .unwrap_or(now)
 }
 
+#[allow(dead_code)]
 pub(crate) fn test_if_valid_server(host: &str, name: &str) -> ResultType<SocketAddr> {
     use std::net::ToSocketAddrs;
-    let res = if host.contains(":") {
+    let res = if host.contains(':') {
         host.to_socket_addrs()?.next().context("")
     } else {
         format!("{}:{}", host, 0)
@@ -34,9 +36,10 @@ pub(crate) fn test_if_valid_server(host: &str, name: &str) -> ResultType<SocketA
     res
 }
 
+#[allow(dead_code)]
 pub(crate) fn get_servers(s: &str, tag: &str) -> Vec<String> {
     let servers: Vec<String> = s
-        .split(",")
+        .split(',')
         .filter(|x| !x.is_empty() && test_if_valid_server(x, tag).is_ok())
         .map(|x| x.to_owned())
         .collect();
@@ -44,17 +47,19 @@ pub(crate) fn get_servers(s: &str, tag: &str) -> Vec<String> {
     servers
 }
 
+#[allow(dead_code)]
 #[inline]
 fn arg_name(name: &str) -> String {
-    name.to_uppercase().replace("_", "-")
+    name.to_uppercase().replace('_', "-")
 }
 
+#[allow(dead_code)]
 pub fn init_args(args: &str, name: &str, about: &str) {
     let matches = App::new(name)
         .version(crate::version::VERSION)
         .author("Purslane Ltd. <[email protected]>")
         .about(about)
-        .args_from_usage(&args)
+        .args_from_usage(args)
         .get_matches();
     if let Ok(v) = Ini::load_from_file(".env") {
         if let Some(section) = v.section(None::<String>) {
@@ -79,16 +84,19 @@ pub fn init_args(args: &str, name: &str, about: &str) {
     }
 }
 
+#[allow(dead_code)]
 #[inline]
 pub fn get_arg(name: &str) -> String {
     get_arg_or(name, "".to_owned())
 }
 
+#[allow(dead_code)]
 #[inline]
 pub fn get_arg_or(name: &str, default: String) -> String {
     std::env::var(arg_name(name)).unwrap_or(default)
 }
 
+#[allow(dead_code)]
 #[inline]
 pub fn now() -> u64 {
     SystemTime::now()
@@ -121,7 +129,7 @@ pub fn gen_sk(wait: u64) -> (String, Option<sign::SecretKey>) {
         };
         let (mut pk, mut sk) = gen_func();
         for _ in 0..300 {
-            if !pk.contains("/") && !pk.contains(":") {
+            if !pk.contains('/') && !pk.contains(':') {
                 break;
             }
             (pk, sk) = gen_func();
diff --git a/src/database.rs b/src/database.rs
index 41ad5e3..fa1b6ed 100644
--- a/src/database.rs
+++ b/src/database.rs
@@ -1,6 +1,5 @@
 use async_trait::async_trait;
 use hbb_common::{log, ResultType};
-use serde_json::value::Value;
 use sqlx::{
     sqlite::SqliteConnectOptions, ConnectOptions, Connection, Error as SqlxError, SqliteConnection,
 };
@@ -8,7 +7,6 @@ use std::{ops::DerefMut, str::FromStr};
 //use sqlx::postgres::PgPoolOptions;
 //use sqlx::mysql::MySqlPoolOptions;
 
-pub(crate) type MapValue = serde_json::map::Map<String, Value>;
 type Pool = deadpool::managed::Pool<DbPool>;
 
 pub struct DbPool {
@@ -54,7 +52,7 @@ impl Database {
             std::fs::File::create(url).ok();
         }
         let n: usize = std::env::var("MAX_DATABASE_CONNECTIONS")
-            .unwrap_or("1".to_owned())
+            .unwrap_or_else(|_| "1".to_owned())
             .parse()
             .unwrap_or(1);
         log::debug!("MAX_DATABASE_CONNECTIONS={}", n);
@@ -105,24 +103,6 @@ impl Database {
         .await?)
     }
 
-    #[inline]
-    pub async fn get_conn(&self) -> ResultType<deadpool::managed::Object<DbPool>> {
-        Ok(self.pool.get().await?)
-    }
-
-    pub async fn update_peer(&self, payload: MapValue, guid: &[u8]) -> ResultType<()> {
-        let mut conn = self.get_conn().await?;
-        let mut tx = conn.begin().await?;
-        if let Some(v) = payload.get("note") {
-            let v = get_str(v);
-            sqlx::query!("update peer set note = ? where guid = ?", v, guid)
-                .execute(&mut tx)
-                .await?;
-        }
-        tx.commit().await?;
-        Ok(())
-    }
-
     pub async fn insert_peer(
         &self,
         id: &str,
@@ -199,17 +179,3 @@ mod tests {
         hbb_common::futures::future::join_all(jobs).await;
     }
 }
-
-pub(crate) fn get_str(v: &Value) -> Option<&str> {
-    match v {
-        Value::String(v) => {
-            let v = v.trim();
-            if v.is_empty() {
-                None
-            } else {
-                Some(v)
-            }
-        }
-        _ => None,
-    }
-}
diff --git a/src/peer.rs b/src/peer.rs
index 1ce5a2e..4c3ab72 100644
--- a/src/peer.rs
+++ b/src/peer.rs
@@ -10,10 +10,13 @@ use hbb_common::{
 use serde_derive::{Deserialize, Serialize};
 use std::{collections::HashMap, collections::HashSet, net::SocketAddr, sync::Arc, time::Instant};
 
+type IpBlockMap = HashMap<String, ((u32, Instant), (HashSet<String>, Instant))>;
+type UserStatusMap = HashMap<Vec<u8>, Arc<(Option<Vec<u8>>, bool)>>;
+type IpChangesMap = HashMap<String, (Instant, HashMap<String, i32>)>;
 lazy_static::lazy_static! {
-    pub(crate) static ref IP_BLOCKER: Mutex<HashMap<String, ((u32, Instant), (HashSet<String>, Instant))>> = Default::default();
-    pub(crate) static ref USER_STATUS: RwLock<HashMap<Vec<u8>, Arc<(Option<Vec<u8>>, bool)>>> = Default::default();
-    pub(crate) static ref IP_CHANGES: Mutex<HashMap<String, (Instant, HashMap<String, i32>)>> = Default::default();
+    pub(crate) static ref IP_BLOCKER: Mutex<IpBlockMap> = Default::default();
+    pub(crate) static ref USER_STATUS: RwLock<UserStatusMap> = Default::default();
+    pub(crate) static ref IP_CHANGES: Mutex<IpChangesMap> = Default::default();
 }
 pub static IP_CHANGE_DUR: u64 = 180;
 pub static IP_CHANGE_DUR_X2: u64 = IP_CHANGE_DUR * 2;
@@ -32,9 +35,9 @@ pub(crate) struct Peer {
     pub(crate) guid: Vec<u8>,
     pub(crate) uuid: Bytes,
     pub(crate) pk: Bytes,
-    pub(crate) user: Option<Vec<u8>>,
+    // pub(crate) user: Option<Vec<u8>>,
     pub(crate) info: PeerInfo,
-    pub(crate) disabled: bool,
+    // pub(crate) disabled: bool,
     pub(crate) reg_pk: (u32, Instant), // how often register_pk
 }
 
@@ -47,8 +50,8 @@ impl Default for Peer {
             uuid: Bytes::new(),
             pk: Bytes::new(),
             info: Default::default(),
-            user: None,
-            disabled: false,
+            // user: None,
+            // disabled: false,
             reg_pk: (0, get_expired_time()),
         }
     }
@@ -65,7 +68,6 @@ pub(crate) struct PeerMap {
 impl PeerMap {
     pub(crate) async fn new() -> ResultType<Self> {
         let db = std::env::var("DB_URL").unwrap_or({
-            #[allow(unused_mut)]
             let mut db = "db_v2.sqlite3".to_owned();
             #[cfg(all(windows, not(debug_assertions)))]
             {
@@ -132,24 +134,22 @@ impl PeerMap {
 
     #[inline]
     pub(crate) async fn get(&self, id: &str) -> Option<LockPeer> {
-        let p = self.map.read().await.get(id).map(|x| x.clone());
+        let p = self.map.read().await.get(id).cloned();
         if p.is_some() {
             return p;
-        } else {
-            if let Ok(Some(v)) = self.db.get_peer(id).await {
-                let peer = Peer {
-                    guid: v.guid,
-                    uuid: v.uuid.into(),
-                    pk: v.pk.into(),
-                    user: v.user,
-                    info: serde_json::from_str::<PeerInfo>(&v.info).unwrap_or_default(),
-                    disabled: v.status == Some(0),
-                    ..Default::default()
-                };
-                let peer = Arc::new(RwLock::new(peer));
-                self.map.write().await.insert(id.to_owned(), peer.clone());
-                return Some(peer);
-            }
+        } else if let Ok(Some(v)) = self.db.get_peer(id).await {
+            let peer = Peer {
+                guid: v.guid,
+                uuid: v.uuid.into(),
+                pk: v.pk.into(),
+                // user: v.user,
+                info: serde_json::from_str::<PeerInfo>(&v.info).unwrap_or_default(),
+                // disabled: v.status == Some(0),
+                ..Default::default()
+            };
+            let peer = Arc::new(RwLock::new(peer));
+            self.map.write().await.insert(id.to_owned(), peer.clone());
+            return Some(peer);
         }
         None
     }
@@ -170,7 +170,7 @@ impl PeerMap {
 
     #[inline]
     pub(crate) async fn get_in_memory(&self, id: &str) -> Option<LockPeer> {
-        self.map.read().await.get(id).map(|x| x.clone())
+        self.map.read().await.get(id).cloned()
     }
 
     #[inline]
diff --git a/src/relay_server.rs b/src/relay_server.rs
index be8a69d..d6c4788 100644
--- a/src/relay_server.rs
+++ b/src/relay_server.rs
@@ -37,12 +37,12 @@ lazy_static::lazy_static! {
 }
 
 static mut DOWNGRADE_THRESHOLD: f64 = 0.66;
-static mut DOWNGRADE_START_CHECK: usize = 1800_000; // in ms
+static mut DOWNGRADE_START_CHECK: usize = 1_800_000; // in ms
 static mut LIMIT_SPEED: usize = 4 * 1024 * 1024; // in bit/s
 static mut TOTAL_BANDWIDTH: usize = 1024 * 1024 * 1024; // in bit/s
 static mut SINGLE_BANDWIDTH: usize = 16 * 1024 * 1024; // in bit/s
-const BLACKLIST_FILE: &'static str = "blacklist.txt";
-const BLOCKLIST_FILE: &'static str = "blocklist.txt";
+const BLACKLIST_FILE: &str = "blacklist.txt";
+const BLOCKLIST_FILE: &str = "blocklist.txt";
 
 #[tokio::main(flavor = "multi_thread")]
 pub async fn start(port: &str, key: &str) -> ResultType<()> {
@@ -50,8 +50,8 @@ pub async fn start(port: &str, key: &str) -> ResultType<()> {
     if let Ok(mut file) = std::fs::File::open(BLACKLIST_FILE) {
         let mut contents = String::new();
         if file.read_to_string(&mut contents).is_ok() {
-            for x in contents.split("\n") {
-                if let Some(ip) = x.trim().split(' ').nth(0) {
+            for x in contents.split('\n') {
+                if let Some(ip) = x.trim().split(' ').next() {
                     BLACKLIST.write().await.insert(ip.to_owned());
                 }
             }
@@ -65,8 +65,8 @@ pub async fn start(port: &str, key: &str) -> ResultType<()> {
     if let Ok(mut file) = std::fs::File::open(BLOCKLIST_FILE) {
         let mut contents = String::new();
         if file.read_to_string(&mut contents).is_ok() {
-            for x in contents.split("\n") {
-                if let Some(ip) = x.trim().split(' ').nth(0) {
+            for x in contents.split('\n') {
+                if let Some(ip) = x.trim().split(' ').next() {
                     BLOCKLIST.write().await.insert(ip.to_owned());
                 }
             }
@@ -158,8 +158,10 @@ fn check_params() {
 }
 
 async fn check_cmd(cmd: &str, limiter: Limiter) -> String {
+    use std::fmt::Write;
+
     let mut res = "".to_owned();
-    let mut fds = cmd.trim().split(" ");
+    let mut fds = cmd.trim().split(' ');
     match fds.next() {
         Some("h") => {
             res = format!(
@@ -180,7 +182,7 @@ async fn check_cmd(cmd: &str, limiter: Limiter) -> String {
         }
         Some("blacklist-add" | "ba") => {
             if let Some(ip) = fds.next() {
-                for ip in ip.split("|") {
+                for ip in ip.split('|') {
                     BLACKLIST.write().await.insert(ip.to_owned());
                 }
             }
@@ -190,7 +192,7 @@ async fn check_cmd(cmd: &str, limiter: Limiter) -> String {
                 if ip == "all" {
                     BLACKLIST.write().await.clear();
                 } else {
-                    for ip in ip.split("|") {
+                    for ip in ip.split('|') {
                         BLACKLIST.write().await.remove(ip);
                     }
                 }
@@ -201,13 +203,13 @@ async fn check_cmd(cmd: &str, limiter: Limiter) -> String {
                 res = format!("{}\n", BLACKLIST.read().await.get(ip).is_some());
             } else {
                 for ip in BLACKLIST.read().await.clone().into_iter() {
-                    res += &format!("{}\n", ip);
+                    let _ = writeln!(res, "{ip}");
                 }
             }
         }
         Some("blocklist-add" | "Ba") => {
             if let Some(ip) = fds.next() {
-                for ip in ip.split("|") {
+                for ip in ip.split('|') {
                     BLOCKLIST.write().await.insert(ip.to_owned());
                 }
             }
@@ -217,7 +219,7 @@ async fn check_cmd(cmd: &str, limiter: Limiter) -> String {
                 if ip == "all" {
                     BLOCKLIST.write().await.clear();
                 } else {
-                    for ip in ip.split("|") {
+                    for ip in ip.split('|') {
                         BLOCKLIST.write().await.remove(ip);
                     }
                 }
@@ -228,7 +230,7 @@ async fn check_cmd(cmd: &str, limiter: Limiter) -> String {
                 res = format!("{}\n", BLOCKLIST.read().await.get(ip).is_some());
             } else {
                 for ip in BLOCKLIST.read().await.clone().into_iter() {
-                    res += &format!("{}\n", ip);
+                    let _ = writeln!(res, "{ip}");
                 }
             }
         }
@@ -313,15 +315,16 @@ async fn check_cmd(cmd: &str, limiter: Limiter) -> String {
                 .read()
                 .await
                 .iter()
-                .map(|x| (x.0.clone(), x.1.clone()))
+                .map(|x| (x.0.clone(), *x.1))
                 .collect();
             tmp.sort_by(|a, b| ((b.1).1).partial_cmp(&(a.1).1).unwrap());
             for (ip, (elapsed, total, highest, speed)) in tmp {
-                if elapsed <= 0 {
+                if elapsed == 0 {
                     continue;
                 }
-                res += &format!(
-                    "{}: {}s {:.2}MB {}kb/s {}kb/s {}kb/s\n",
+                let _ = writeln!(
+                    res,
+                    "{}: {}s {:.2}MB {}kb/s {}kb/s {}kb/s",
                     ip,
                     elapsed / 1000,
                     total as f64 / 1024. / 1024. / 8.,
@@ -496,7 +499,7 @@ async fn relay(
                     total_limiter.consume(nb).await;
                     total += nb;
                     total_s += nb;
-                    if bytes.len() > 0 {
+                    if !bytes.is_empty() {
                         stream.send_raw(bytes.into()).await?;
                     }
                 } else {
@@ -515,7 +518,7 @@ async fn relay(
                     total_limiter.consume(nb).await;
                     total += nb;
                     total_s += nb;
-                    if bytes.len() > 0 {
+                    if !bytes.is_empty() {
                         peer.send_raw(bytes.into()).await?;
                     }
                 } else {
@@ -537,7 +540,7 @@ async fn relay(
             }
             blacked = BLACKLIST.read().await.get(&ip).is_some();
             tm = std::time::Instant::now();
-            let speed = total_s / (n as usize);
+            let speed = total_s / n;
             if speed > highest_s {
                 highest_s = speed;
             }
@@ -547,16 +550,17 @@ async fn relay(
                 (elapsed as _, total as _, highest_s as _, speed as _),
             );
             total_s = 0;
-            if elapsed > unsafe { DOWNGRADE_START_CHECK } && !downgrade {
-                if total > elapsed * downgrade_threshold {
-                    downgrade = true;
-                    log::info!(
-                        "Downgrade {}, exceed downgrade threshold {}bit/ms in {}ms",
-                        id,
-                        downgrade_threshold,
-                        elapsed
-                    );
-                }
+            if elapsed > unsafe { DOWNGRADE_START_CHECK }
+                && !downgrade
+                && total > elapsed * downgrade_threshold
+            {
+                downgrade = true;
+                log::info!(
+                    "Downgrade {}, exceed downgrade threshold {}bit/ms in {}ms",
+                    id,
+                    downgrade_threshold,
+                    elapsed
+                );
             }
         }
     }
diff --git a/src/rendezvous_server.rs b/src/rendezvous_server.rs
index 7a63c11..48a9a23 100644
--- a/src/rendezvous_server.rs
+++ b/src/rendezvous_server.rs
@@ -40,7 +40,7 @@ const ADDR_127: IpAddr = IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1));
 
 #[derive(Clone, Debug)]
 enum Data {
-    Msg(RendezvousMessage, SocketAddr),
+    Msg(Box<RendezvousMessage>, SocketAddr),
     RelayServers0(String),
     RelayServers(RelayServers),
 }
@@ -233,7 +233,7 @@ impl RendezvousServer {
                 }
                 Some(data) = rx.recv() => {
                     match data {
-                        Data::Msg(msg, addr) => { allow_err!(socket.send(&msg, addr).await); }
+                        Data::Msg(msg, addr) => { allow_err!(socket.send(msg.as_ref(), addr).await); }
                         Data::RelayServers0(rs) => { self.parse_relay_servers(&rs); }
                         Data::RelayServers(rs) => { self.relay_servers = Arc::new(rs); }
                     }
@@ -303,11 +303,11 @@ impl RendezvousServer {
         socket: &mut FramedSocket,
         key: &str,
     ) -> ResultType<()> {
-        if let Ok(msg_in) = RendezvousMessage::parse_from_bytes(&bytes) {
+        if let Ok(msg_in) = RendezvousMessage::parse_from_bytes(bytes) {
             match msg_in.union {
                 Some(rendezvous_message::Union::RegisterPeer(rp)) => {
                     // B registered
-                    if rp.id.len() > 0 {
+                    if !rp.id.is_empty() {
                         log::trace!("New peer registered: {:?} {:?}", &rp.id, &addr);
                         self.update_addr(rp.id, addr, socket).await?;
                         if self.inner.serial > rp.serial {
@@ -384,12 +384,10 @@ impl RendezvousServer {
                                 *tm = Instant::now();
                                 ips.clear();
                                 ips.insert(ip.clone(), 1);
+                            } else if let Some(v) = ips.get_mut(&ip) {
+                                *v += 1;
                             } else {
-                                if let Some(v) = ips.get_mut(&ip) {
-                                    *v += 1;
-                                } else {
-                                    ips.insert(ip.clone(), 1);
-                                }
+                                ips.insert(ip.clone(), 1);
                             }
                         } else {
                             lock.insert(
@@ -472,14 +470,14 @@ impl RendezvousServer {
         key: &str,
         ws: bool,
     ) -> bool {
-        if let Ok(msg_in) = RendezvousMessage::parse_from_bytes(&bytes) {
+        if let Ok(msg_in) = RendezvousMessage::parse_from_bytes(bytes) {
             match msg_in.union {
                 Some(rendezvous_message::Union::PunchHoleRequest(ph)) => {
                     // there maybe several attempt, so sink can be none
                     if let Some(sink) = sink.take() {
                         self.tcp_punch.lock().await.insert(addr, sink);
                     }
-                    allow_err!(self.handle_tcp_punch_hole_request(addr, ph, &key, ws).await);
+                    allow_err!(self.handle_tcp_punch_hole_request(addr, ph, key, ws).await);
                     return true;
                 }
                 Some(rendezvous_message::Union::RequestRelay(mut rf)) => {
@@ -492,7 +490,7 @@ impl RendezvousServer {
                         rf.socket_addr = AddrMangle::encode(addr).into();
                         msg_out.set_request_relay(rf);
                         let peer_addr = peer.read().await.socket_addr;
-                        self.tx.send(Data::Msg(msg_out, peer_addr)).ok();
+                        self.tx.send(Data::Msg(msg_out.into(), peer_addr)).ok();
                     }
                     return true;
                 }
@@ -747,14 +745,14 @@ impl RendezvousServer {
                     ..Default::default()
                 });
             }
-            return Ok((msg_out, Some(peer_addr)));
+            Ok((msg_out, Some(peer_addr)))
         } else {
             let mut msg_out = RendezvousMessage::new();
             msg_out.set_punch_hole_response(PunchHoleResponse {
                 failure: punch_hole_response::Failure::ID_NOT_EXIST.into(),
                 ..Default::default()
             });
-            return Ok((msg_out, None));
+            Ok((msg_out, None))
         }
     }
 
@@ -765,8 +763,8 @@ impl RendezvousServer {
         peers: Vec<String>,
     ) -> ResultType<()> {
         let mut states = BytesMut::zeroed((peers.len() + 7) / 8);
-        for i in 0..peers.len() {
-            if let Some(peer) = self.pm.get_in_memory(&peers[i]).await {
+        for (i, peer_id) in peers.iter().enumerate() {
+            if let Some(peer) = self.pm.get_in_memory(peer_id).await {
                 let elapsed = peer.read().await.last_reg_time.elapsed().as_millis() as i32;
                 // bytes index from left to right
                 let states_idx = i / 8;
@@ -832,7 +830,7 @@ impl RendezvousServer {
     ) -> ResultType<()> {
         let (msg, to_addr) = self.handle_punch_hole_request(addr, ph, key, ws).await?;
         if let Some(addr) = to_addr {
-            self.tx.send(Data::Msg(msg, addr))?;
+            self.tx.send(Data::Msg(msg.into(), addr))?;
         } else {
             self.send_to_tcp_sync(msg, addr).await?;
         }
@@ -848,7 +846,7 @@ impl RendezvousServer {
     ) -> ResultType<()> {
         let (msg, to_addr) = self.handle_punch_hole_request(addr, ph, key, false).await?;
         self.tx.send(Data::Msg(
-            msg,
+            msg.into(),
             match to_addr {
                 Some(addr) => addr,
                 None => addr,
@@ -907,8 +905,10 @@ impl RendezvousServer {
     }
 
     async fn check_cmd(&self, cmd: &str) -> String {
+        use std::fmt::Write as _;
+
         let mut res = "".to_owned();
-        let mut fds = cmd.trim().split(" ");
+        let mut fds = cmd.trim().split(' ');
         match fds.next() {
             Some("h") => {
                 res = format!(
@@ -926,7 +926,7 @@ impl RendezvousServer {
                     self.tx.send(Data::RelayServers0(rs.to_owned())).ok();
                 } else {
                     for ip in self.relay_servers.iter() {
-                        res += &format!("{}\n", ip);
+                        let _ = writeln!(res, "{ip}");
                     }
                 }
             }
@@ -942,8 +942,9 @@ impl RendezvousServer {
                 if start < 0 {
                     if let Some(ip) = ip {
                         if let Some((a, b)) = lock.get(ip) {
-                            res += &format!(
-                                "{}/{}s {}/{}s\n",
+                            let _ = writeln!(
+                                res,
+                                "{}/{}s {}/{}s",
                                 a.0,
                                 a.1.elapsed().as_secs(),
                                 b.0.len(),
@@ -968,8 +969,9 @@ impl RendezvousServer {
                             continue;
                         }
                         if let Some((ip, (a, b))) = x {
-                            res += &format!(
-                                "{}: {}/{}s {}/{}s\n",
+                            let _ = writeln!(
+                                res,
+                                "{}: {}/{}s {}/{}s",
                                 ip,
                                 a.0,
                                 a.1.elapsed().as_secs(),
@@ -986,10 +988,10 @@ impl RendezvousServer {
                 res = format!("{}\n", lock.len());
                 let id = fds.next();
                 let mut start = id.map(|x| x.parse::<i32>().unwrap_or(-1)).unwrap_or(-1);
-                if start < 0 || start > 10_000_000 {
+                if !(0..=10_000_000).contains(&start) {
                     if let Some(id) = id {
                         if let Some((tm, ips)) = lock.get(id) {
-                            res += &format!("{}s {:?}\n", tm.elapsed().as_secs(), ips);
+                            let _ = writeln!(res, "{}s {:?}", tm.elapsed().as_secs(), ips);
                         }
                         if fds.next() == Some("-") {
                             lock.remove(id);
@@ -1009,7 +1011,7 @@ impl RendezvousServer {
                             continue;
                         }
                         if let Some((id, (tm, ips))) = x {
-                            res += &format!("{}: {}s {:?}\n", id, tm.elapsed().as_secs(), ips,);
+                            let _ = writeln!(res, "{}: {}s {:?}", id, tm.elapsed().as_secs(), ips,);
                         }
                     }
                 }
@@ -1023,7 +1025,7 @@ impl RendezvousServer {
                     }
                     self.tx.send(Data::RelayServers0(rs.to_owned())).ok();
                 } else {
-                    res += &format!("ALWAYS_USE_RELAY: {:?}\n", unsafe { ALWAYS_USE_RELAY });
+                    let _ = writeln!(res, "ALWAYS_USE_RELAY: {:?}", unsafe { ALWAYS_USE_RELAY });
                 }
             }
             Some("test-geo" | "tg") => {
@@ -1106,13 +1108,10 @@ impl RendezvousServer {
             let (a, mut b) = ws_stream.split();
             sink = Some(Sink::Ws(a));
             while let Ok(Some(Ok(msg))) = timeout(30_000, b.next()).await {
-                match msg {
-                    tungstenite::Message::Binary(bytes) => {
-                        if !self.handle_tcp(&bytes, &mut sink, addr, key, ws).await {
-                            break;
-                        }
+                if let tungstenite::Message::Binary(bytes) = msg {
+                    if !self.handle_tcp(&bytes, &mut sink, addr, key, ws).await {
+                        break;
                     }
-                    _ => {}
                 }
             }
         } else {
@@ -1138,7 +1137,7 @@ impl RendezvousServer {
         } else {
             match self.pm.get(&id).await {
                 Some(peer) => {
-                    let pk = peer.read().await.pk.clone().into();
+                    let pk = peer.read().await.pk.clone();
                     sign::sign(
                         &hbb_common::message_proto::IdPk {
                             id,
@@ -1147,7 +1146,7 @@ impl RendezvousServer {
                         }
                         .write_to_bytes()
                         .unwrap_or_default(),
-                        &self.inner.sk.as_ref().unwrap(),
+                        self.inner.sk.as_ref().unwrap(),
                     )
                     .into()
                 }
@@ -1203,7 +1202,7 @@ async fn check_relay_servers(rs0: Arc<RelayServers>, tx: Sender) {
     let rs = Arc::new(Mutex::new(Vec::new()));
     for x in rs0.iter() {
         let mut host = x.to_owned();
-        if !host.contains(":") {
+        if !host.contains(':') {
             host = format!("{}:{}", host, hbb_common::config::RELAY_PORT);
         }
         let rs = rs.clone();
@@ -1219,7 +1218,7 @@ async fn check_relay_servers(rs0: Arc<RelayServers>, tx: Sender) {
     }
     join_all(futs).await;
     log::debug!("check_relay_servers");
-    let rs = std::mem::replace(&mut *rs.lock().await, Default::default());
+    let rs = std::mem::take(&mut *rs.lock().await);
     if !rs.is_empty() {
         tx.send(Data::RelayServers(rs)).ok();
     }
diff --git a/src/utils.rs b/src/utils.rs
index 7b36aed..b37878a 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -33,7 +33,7 @@ fn gen_keypair() {
 }
 
 fn validate_keypair(pk: &str, sk: &str) -> ResultType<()> {
-    let sk1 = base64::decode(&sk);
+    let sk1 = base64::decode(sk);
     if sk1.is_err() {
         bail!("Invalid secret key");
     }
@@ -45,7 +45,7 @@ fn validate_keypair(pk: &str, sk: &str) -> ResultType<()> {
     }
     let secret_key = secret_key.unwrap();
 
-    let pk1 = base64::decode(&pk);
+    let pk1 = base64::decode(pk);
     if pk1.is_err() {
         bail!("Invalid public key");
     }
@@ -96,14 +96,13 @@ fn doctor_ip(server_ip_address: std::net::IpAddr, server_address: Option<&str>)
     // reverse dns lookup
     // TODO: (check) doesn't seem to do reverse lookup on OSX...
     let reverse = lookup_addr(&server_ip_address).unwrap();
-    if server_address.is_some() {
-        if reverse == server_address.unwrap() {
+    if let Some(server_address) = server_address {
+        if reverse == server_address {
             println!("Reverse DNS lookup: '{}' MATCHES server address", reverse);
         } else {
             println!(
                 "Reverse DNS lookup: '{}' DOESN'T MATCH server address '{}'",
-                reverse,
-                server_address.unwrap()
+                reverse, server_address
             );
         }
     }
@@ -126,19 +125,18 @@ fn doctor(server_address_unclean: &str) {
     let server_address2 = server_address3.to_lowercase();
     let server_address = server_address2.as_str();
     println!("Checking server:  {}\n", server_address);
-    let server_ipaddr = server_address.parse::<IpAddr>();
-    if server_ipaddr.is_err() {
+    if let Ok(server_ipaddr) = server_address.parse::<IpAddr>() {
+        // user requested an ip address
+        doctor_ip(server_ipaddr, None);
+    } else {
         // the passed string is not an ip address
         let ips: Vec<std::net::IpAddr> = lookup_host(server_address).unwrap();
-        println!("Found {} IP addresses: ", ips.iter().count());
+        println!("Found {} IP addresses: ", ips.len());
 
         ips.iter().for_each(|ip| println!(" - {ip}"));
 
-        ips.iter().for_each(|ip| doctor_ip(*ip, Some(server_address)));
-
-    } else {
-        // user requested an ip address
-        doctor_ip(server_ipaddr.unwrap(), None);
+        ips.iter()
+            .for_each(|ip| doctor_ip(*ip, Some(server_address)));
     }
 }
 
diff --git a/src/version.rs b/src/version.rs
index 3d00084..f8a74a8 100644
--- a/src/version.rs
+++ b/src/version.rs
@@ -1,2 +1,3 @@
 pub const VERSION: &str = "1.1.6";
-pub const BUILD_DATE: &str = "2023-01-06 11:03";
+#[allow(dead_code)]
+pub const BUILD_DATE: &str = "2023-01-06 18:48";
\ No newline at end of file