refactor

rpxy-lib/src/backend/load_balance/load_balance_sticky.rs

@@ -112,13 +112,16 @@ impl LoadBalanceWithPointer for LoadBalanceSticky {
       }
       Some(context) => {
         let server_id = &context.sticky_cookie.value.value;
-        if let Some(server_index) = self.get_server_index_from_id(server_id) {
-          debug!("Valid sticky cookie: id={}, index={}", server_id, server_index);
-          server_index
-        } else {
+        self.get_server_index_from_id(server_id).map_or_else(
+          || {
             debug!("Invalid sticky cookie: id={}", server_id);
             self.simple_increment_ptr()
-        }
+          },
+          |server_index| {
+            debug!("Valid sticky cookie: id={}, index={}", server_id, server_index);
+            server_index
+          },
+        )
       }
     };
 

rpxy-lib/src/backend/upstream.rs

@@ -72,27 +72,22 @@ impl PathManager {
       .inner
       .iter()
       .filter(|(route_bytes, _)| {
-        match path_name.starts_with(route_bytes) {
-          true => {
+        path_name.starts_with(route_bytes) && {
           route_bytes.len() == 1 // route = '/', i.e., default
-              || match path_name.get(route_bytes.len()) {
-                None => true, // exact case
-                Some(p) => p == &b'/', // sub-path case
-              }
-          }
-          _ => false,
+            || path_name.get(route_bytes.len()).map_or(
+              true, // exact case
+              |p| p == &b'/'
+            ) // sub-path case
         }
       })
       .max_by_key(|(route_bytes, _)| route_bytes.len());
-    if let Some((path, u)) = matched_upstream {
+    matched_upstream.map(|(path, u)| {
       debug!(
         "Found upstream: {:?}",
         path.try_into().unwrap_or_else(|_| "<none>".to_string())
       );
-      Some(u)
-    } else {
-      None
-    }
+      u
+    })
   }
 }
 
@@ -211,14 +206,15 @@ impl UpstreamCandidatesBuilder {
   }
   /// Set the activated upstream options defined in [[UpstreamOption]]
   pub fn options(&mut self, v: &Option<Vec<String>>) -> &mut Self {
-    let opts = if let Some(opts) = v {
+    let opts = v.as_ref().map_or_else(
+      || Default::default(),
+      |opts| {
         opts
           .iter()
           .filter_map(|str| UpstreamOption::try_from(str.as_str()).ok())
           .collect::<HashSet<UpstreamOption>>()
-    } else {
-      Default::default()
-    };
+      },
+    );
     self.options = Some(opts);
     self
   }

rpxy-lib/src/forwarder/cache/cache_main.rs

@@ -185,9 +185,7 @@ impl RpxyCache {
     let cache_key = derive_cache_key_from_uri(req.uri());
 
     // First check cache chance
-    let Ok(Some(cached_object)) = self.inner.get(&cache_key) else {
-      return None;
-    };
+    let cached_object = self.inner.get(&cache_key).ok()??;
 
     // Secondly check the cache freshness as an HTTP message
     let now = SystemTime::now();
@@ -451,10 +449,10 @@ impl LruCacheManager {
 
   /// Push an entry
   fn push(&self, cache_key: &str, cache_object: &CacheObject) -> CacheResult<Option<(String, CacheObject)>> {
-    let Ok(mut lock) = self.inner.lock() else {
+    let mut lock = self.inner.lock().map_err(|_| {
       error!("Failed to acquire mutex lock for writing cache entry");
-      return Err(CacheError::FailedToAcquiredMutexLockForCache);
-    };
+      CacheError::FailedToAcquiredMutexLockForCache
+    })?;
     let res = Ok(lock.push(cache_key.to_string(), cache_object.clone()));
     // This may be inconsistent with the actual number of entries
     self.cnt.store(lock.len(), Ordering::Relaxed);
@@ -463,10 +461,10 @@ impl LruCacheManager {
 
   /// Get an entry
   fn get(&self, cache_key: &str) -> CacheResult<Option<CacheObject>> {
-    let Ok(mut lock) = self.inner.lock() else {
+    let mut lock = self.inner.lock().map_err(|_| {
       error!("Mutex can't be locked for checking cache entry");
-      return Err(CacheError::FailedToAcquiredMutexLockForCheck);
-    };
+      CacheError::FailedToAcquiredMutexLockForCheck
+    })?;
     let Some(cached_object) = lock.get(cache_key) else {
       return Ok(None);
     };

rpxy-lib/src/message_handler/handler_manipulate_messages.rs

@@ -70,13 +70,15 @@ where
 
     // Add te: trailer if contained in original request
     let contains_te_trailers = {
-      if let Some(te) = req.headers().get(header::TE) {
+      req
+        .headers()
+        .get(header::TE)
+        .map(|te| {
           te.as_bytes()
             .split(|v| v == &b',' || v == &b' ')
             .any(|x| x == "trailers".as_bytes())
-      } else {
-        false
-      }
+        })
+        .unwrap_or(false)
     };
 
     let original_uri = req.uri().to_string();
@@ -136,11 +138,7 @@ where
     let new_uri = Uri::builder()
       .scheme(upstream_chosen.uri.scheme().unwrap().as_str())
       .authority(upstream_chosen.uri.authority().unwrap().as_str());
-    let org_pq = match req.uri().path_and_query() {
-      Some(pq) => pq.to_string(),
-      None => "/".to_string(),
-    }
-    .into_bytes();
+    let org_pq = req.uri().path_and_query().map(|pq| pq.as_str()).unwrap_or("/").as_bytes();
 
     // replace some parts of path if opt_replace_path is enabled for chosen upstream
     let new_pq = match &upstream_candidates.replace_path {
@@ -155,7 +153,7 @@ where
         new_pq.extend_from_slice(&org_pq[matched_path.len()..]);
         new_pq
       }
-      None => org_pq,
+      None => org_pq.to_vec(),
     };
     *req.uri_mut() = new_uri.path_and_query(new_pq).build()?;
 

rpxy-lib/src/message_handler/utils_headers.rs

@@ -236,10 +236,9 @@ pub(super) fn add_forwarding_header(
 pub(super) fn remove_connection_header(headers: &mut HeaderMap) {
   if let Some(values) = headers.get(header::CONNECTION) {
     if let Ok(v) = values.clone().to_str() {
-      for m in v.split(',') {
-        if !m.is_empty() {
-          headers.remove(m.trim());
-        }
+      let keys = v.split(',').map(|m| m.trim()).filter(|m| !m.is_empty());
+      for m in keys {
+        headers.remove(m);
       }
     }
   }
@@ -274,13 +273,11 @@ pub(super) fn extract_upgrade(headers: &HeaderMap) -> Option<String> {
       .split(',')
       .any(|w| w.trim().eq_ignore_ascii_case(header::UPGRADE.as_str()))
     {
-      if let Some(u) = headers.get(header::UPGRADE) {
-        if let Ok(m) = u.to_str() {
+      if let Some(Ok(m)) = headers.get(header::UPGRADE).map(|u| u.to_str()) {
         debug!("Upgrade in request header: {}", m);
         return Some(m.to_owned());
       }
     }
   }
-  }
   None
 }