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backend/examples/plugin/claude-web-search-router/go/penalty.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"sort"
+	"sync"
+)
+
+const (
+	penaltyBumpOn429503 = 5
+	penaltyDecaySuccess = 1
+)
+
+var backendPenalties = struct {
+	sync.Mutex
+	scores map[routeBackend]int
+}{
+	scores: make(map[routeBackend]int),
+}
+
+func recordBackendFailure(backend routeBackend) {
+	backendPenalties.Lock()
+	defer backendPenalties.Unlock()
+	backendPenalties.scores[backend] += penaltyBumpOn429503
+}
+
+func recordBackendSuccess(backend routeBackend) {
+	backendPenalties.Lock()
+	defer backendPenalties.Unlock()
+	score := backendPenalties.scores[backend] - penaltyDecaySuccess
+	if score < 0 {
+		score = 0
+	}
+	backendPenalties.scores[backend] = score
+}
+
+func penaltyScore(backend routeBackend) int {
+	backendPenalties.Lock()
+	defer backendPenalties.Unlock()
+	return backendPenalties.scores[backend]
+}
+
+func sortBackendsByPenalty(backends []routeBackend) []routeBackend {
+	if len(backends) <= 1 {
+		return append([]routeBackend(nil), backends...)
+	}
+	out := append([]routeBackend(nil), backends...)
+	sort.SliceStable(out, func(i, j int) bool {
+		return penaltyScore(out[i]) < penaltyScore(out[j])
+	})
+	return out
+}
+
+func resetBackendPenaltiesForTest() {
+	backendPenalties.Lock()
+	defer backendPenalties.Unlock()
+	backendPenalties.scores = make(map[routeBackend]int)
+}