clippy all codes (#1214)

1. clippy code
2. add fmt and clippy check in ci

easytier/src/gateway/fast_socks5/mod.rs

@@ -294,7 +294,7 @@ pub fn new_udp_header<T: ToTargetAddr>(target_addr: T) -> Result<Vec<u8>> {
 }
 
 /// Parse data from UDP client on raw buffer, return (frag, target_addr, payload).
-pub async fn parse_udp_request<'a>(mut req: &'a [u8]) -> Result<(u8, TargetAddr, &'a [u8])> {
+pub async fn parse_udp_request(mut req: &[u8]) -> Result<(u8, TargetAddr, &[u8])> {
     let rsv = read_exact!(req, [0u8; 2]).context("Malformed request")?;
 
     if !rsv.eq(&[0u8; 2]) {

easytier/src/gateway/fast_socks5/server.rs

@@ -455,16 +455,16 @@ impl<T: AsyncRead + AsyncWrite + Unpin, A: Authentication, C: AsyncTcpConnector>
 
             info!("User logged successfully.");
 
-            return Ok(credentials);
+            Ok(credentials)
         } else {
             self.inner
                 .write_all(&[1, consts::SOCKS5_AUTH_METHOD_NOT_ACCEPTABLE])
                 .await
                 .context("Can't reply with auth method not acceptable.")?;
 
-            return Err(SocksError::AuthenticationRejected(format!(
-                "Authentication, rejected."
-            )));
+            Err(SocksError::AuthenticationRejected(
+                "Authentication, rejected.".to_string(),
+            ))
         }
     }
 

easytier/src/gateway/fast_socks5/util/target_addr.rs

@@ -72,10 +72,7 @@ impl TargetAddr {
     }
 
     pub fn is_ip(&self) -> bool {
-        match self {
-            TargetAddr::Ip(_) => true,
-            _ => false,
-        }
+        matches!(self, TargetAddr::Ip(_))
     }
 
     pub fn is_domain(&self) -> bool {
@@ -104,7 +101,7 @@ impl TargetAddr {
             }
             TargetAddr::Domain(ref domain, port) => {
                 debug!("TargetAddr::Domain");
-                if domain.len() > u8::max_value() as usize {
+                if domain.len() > u8::MAX as usize {
                     return Err(SocksError::ExceededMaxDomainLen(domain.len()).into());
                 }
                 buf.extend_from_slice(&[consts::SOCKS5_ADDR_TYPE_DOMAIN_NAME, domain.len() as u8]);
@@ -125,8 +122,7 @@ impl std::net::ToSocketAddrs for TargetAddr {
     fn to_socket_addrs(&self) -> io::Result<IntoIter<SocketAddr>> {
         match *self {
             TargetAddr::Ip(addr) => Ok(vec![addr].into_iter()),
-            TargetAddr::Domain(_, _) => Err(io::Error::new(
-                io::ErrorKind::Other,
+            TargetAddr::Domain(_, _) => Err(io::Error::other(
                 "Domain name has to be explicitly resolved, please use TargetAddr::resolve_dns().",
             )),
         }
@@ -149,7 +145,7 @@ pub trait ToTargetAddr {
     fn to_target_addr(&self) -> io::Result<TargetAddr>;
 }
 
-impl<'a> ToTargetAddr for (&'a str, u16) {
+impl ToTargetAddr for (&str, u16) {
     fn to_target_addr(&self) -> io::Result<TargetAddr> {
         // try to parse as an IP first
         if let Ok(addr) = self.0.parse::<Ipv4Addr>() {