Apply clippy suggestions

src/main.rs

@@ -219,7 +219,7 @@ async fn stream_preamble<R: AsyncRead + Unpin>(mut in_rd: StanzaReader<R>, clien
 #[tokio::main]
 //#[tokio::main(flavor = "multi_thread", worker_threads = 10)]
 async fn main() {
-    let main_config = Config::parse(std::env::args_os().skip(1).next().unwrap_or(OsString::from("/etc/xmpp-proxy/xmpp-proxy.toml"))).die("invalid config file");
+    let main_config = Config::parse(std::env::args_os().nth(1).unwrap_or_else(|| OsString::from("/etc/xmpp-proxy/xmpp-proxy.toml"))).die("invalid config file");
 
     #[cfg(feature = "env_logger")]
     {

src/srv.rs

@@ -1,3 +1,5 @@
+#![allow(clippy::upper_case_acronyms)]
+
 use std::net::SocketAddr;
 
 use trust_dns_resolver::error::ResolveError;

src/stanzafilter.rs

@@ -1,3 +1,5 @@
+#![allow(clippy::upper_case_acronyms)]
+
 use anyhow::{bail, Result};
 
 use crate::stanzafilter::StanzaState::*;
@@ -169,7 +171,7 @@ impl StanzaFilter {
         self.cnt = 0;
         self.state = OutsideStanza;
         //trace!("cnt: {}, tag_cnt: {}, state: {:?}", self.cnt, self.tag_cnt, self.state);
-        return ret;
+        ret
     }
 
     fn last_equals(&self, needle: &[u8]) -> Result<bool> {

src/tls.rs

@@ -9,15 +9,13 @@ lazy_static::lazy_static! {
         let mut config = ClientConfig::new();
         config.root_store.add_server_trust_anchors(&webpki_roots::TLS_SERVER_ROOTS);
         config.alpn_protocols.push(ALPN_XMPP_CLIENT[0].to_vec());
-        let config = TlsConnector::from(Arc::new(config));
-        config
+        TlsConnector::from(Arc::new(config))
     };
     static ref SERVER_TLS_CONFIG: TlsConnector = {
         let mut config = ClientConfig::new();
         config.root_store.add_server_trust_anchors(&webpki_roots::TLS_SERVER_ROOTS);
         config.alpn_protocols.push(ALPN_XMPP_SERVER[0].to_vec());
-        let config = TlsConnector::from(Arc::new(config));
-        config
+        TlsConnector::from(Arc::new(config))
     };
 }
 
@@ -59,9 +57,7 @@ pub async fn starttls_connect(
     trace!("starttls reading stream open {}", server_name);
     while let Ok(Some(buf)) = in_rd.next(&mut in_filter).await {
         trace!("received pre-tls stanza: {} '{}'", server_name, to_str(&buf));
-        if buf.starts_with(b"<?xml ") {
-            // ignore this
-        } else if buf.starts_with(b"<stream:stream ") {
+        if buf.starts_with(b"<?xml ") || buf.starts_with(b"<stream:stream ") {
             // ignore this
         } else if buf.starts_with(b"<stream:features") {
             // we send starttls regardless, it could have been stripped out, we don't do plaintext