factor out common loop that tests a sequence of limiters

signal-gateway/src/gateway/log_handler.rs

@@ -1,5 +1,5 @@
 use super::{
-    LimitResult, Limiter, LimiterSet, SignalAlertMessage, Summary,
+    LimitResult, Limiter, LimiterSet, SignalAlertMessage, Summary, evaluate_limiter_sequence,
     log_buffer::LogBuffer,
     route::{Destination, Limit, Route},
 };
@@ -262,11 +262,8 @@ impl LogHandler {
         };
 
         // At least one route passed, now check overall limits
-        for (idx, (filter, limiter)) in self.overall_limits.iter().enumerate() {
-            // Only evaluate the limiter if the message matches the filter
-            if filter.matches(log_msg) && !limiter.evaluate(log_msg) {
-                return Err(SuppressionReason::Overall(LimitResult::OverallLimiter(idx)));
-            }
+        if let Err(i) = evaluate_limiter_sequence(&self.overall_limits, log_msg) {
+            return Err(SuppressionReason::Overall(LimitResult::OverallLimiter(i)));
         }
 
         // All checks passed

signal-gateway/src/gateway/mod.rs

@@ -39,7 +39,7 @@ mod rate_limiter_set;
 pub use rate_limiter_set::{LimitResult, LimiterSet};
 
 mod route;
-pub use route::{Destination, Limit, Route};
+pub use route::{Destination, Limit, Route, evaluate_limiter_sequence};
 
 pub use crate::rate_limiter::{Limiter, RateThreshold};
 

signal-gateway/src/gateway/rate_limiter_set.rs

@@ -1,5 +1,6 @@
 //! Rate limiter set for managing per-route rate limiting.
 
+use super::evaluate_limiter_sequence;
 use crate::{
     concurrent_map::LazyMap,
     log_message::{LogFilter, LogMessage, Origin},
@@ -54,13 +55,9 @@ impl LimiterSet {
     pub fn evaluate(&self, log_msg: &LogMessage, origin: &Origin) -> LimitResult {
         // Check per-origin limiters
         let origin_result = self.limiters.get(origin, |origin_limiters| {
-            for (i, (filter, limiter)) in origin_limiters.iter().enumerate() {
-                // Only evaluate the limiter if the message matches the filter
-                if filter.matches(log_msg) && !limiter.evaluate(log_msg) {
-                    return Some(LimitResult::Limiter(i));
-                }
-            }
-            None
+            evaluate_limiter_sequence(origin_limiters, log_msg)
+                .err()
+                .map(LimitResult::Limiter)
         });
 
         if let Some(result) = origin_result {
@@ -68,11 +65,8 @@ impl LimiterSet {
         }
 
         // Check global limiters
-        for (i, (filter, limiter)) in self.global_limiters.iter().enumerate() {
-            // Only evaluate the limiter if the message matches the filter
-            if filter.matches(log_msg) && !limiter.evaluate(log_msg) {
-                return LimitResult::GlobalLimiter(i);
-            }
+        if let Err(i) = evaluate_limiter_sequence(&self.global_limiters, log_msg) {
+            return LimitResult::GlobalLimiter(i);
         }
 
         LimitResult::Passed

signal-gateway/src/gateway/route.rs

@@ -5,11 +5,27 @@
 
 use super::LimiterSet;
 use crate::{
-    log_message::{Level, LogFilter},
+    log_message::{Level, LogFilter, LogMessage},
     rate_limiter::{Limiter, RateThreshold},
 };
 use serde::Deserialize;
 
+/// Evaluate a sequence of (filter, limiter) pairs against a log message.
+///
+/// Returns `Ok(())` if no limiter blocks the message.
+/// Returns `Err(index)` if the limiter at `index` blocked the message.
+pub fn evaluate_limiter_sequence(
+    seq: &[(LogFilter, Limiter)],
+    log_msg: &LogMessage,
+) -> Result<(), usize> {
+    for (i, (filter, limiter)) in seq.iter().enumerate() {
+        if filter.matches(log_msg) && !limiter.evaluate(log_msg) {
+            return Err(i);
+        }
+    }
+    Ok(())
+}
+
 /// A rate limit rule for suppressing repeated alerts.
 ///
 /// Combines a filter to match specific log messages with a rate threshold.