perf: expand gateway capacity and prevent receipt replay

gateway/internal/protocollog/publisher_test.go

@@ -0,0 +1,34 @@
+package protocollog
+
+import (
+	"context"
+	"testing"
+
+	"github.com/alicebob/miniredis/v2"
+	"github.com/redis/go-redis/v9"
+)
+
+func TestNewUsesLocalRedisWhenURLIsEmpty(t *testing.T) {
+	publisher, err := New("")
+	if err != nil {
+		t.Fatalf("New returned error: %v", err)
+	}
+	if publisher == nil || publisher.Redis == nil {
+		t.Fatal("expected an initialized Redis client")
+	}
+	if got := publisher.Redis.Options().Addr; got != "127.0.0.1:6379" {
+		t.Fatalf("expected local Redis fallback, got %q", got)
+	}
+}
+
+func TestFailuresAreNeverSampledOut(t *testing.T) {
+	mr := miniredis.RunT(t)
+	client := redis.NewClient(&redis.Options{Addr: mr.Addr()})
+	p := &Publisher{Redis: client, SuccessSampleRate: 1, MaxLen: 100}
+	if err := p.Publish(context.Background(), Event{Protocol: "cmpp", EventType: "submit", Status: "failed", ResultCode: "TIMEOUT"}); err != nil {
+		t.Fatal(err)
+	}
+	if client.XLen(context.Background(), p.StreamName()).Val() != 1 {
+		t.Fatal("failed protocol event must be retained")
+	}
+}