feat: AUTO chain rewrite — silent failover+busy skip+pref round-robin+503 tier summary; chain edits reset slot cooldowns (P0/P1); stats by_status + audit jsonl rotation; UI priority-page health badges & status-code card; ctx-menu capture-phase close (outside-press guard); main.go ops warnings; local bundled-Lua verified tests (3 latent bugs fixed); plan.md

internal/gateway/stats_test.go

@@ -0,0 +1,88 @@
+package gateway
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestStatsByStatus(t *testing.T) {
+	s := NewStats(100)
+	s.Record(Req{Key: "k", Model: "m", Source: "s", Status: 200, OK: true})
+	s.Record(Req{Key: "k", Model: "m", Source: "s", Status: 402, OK: false})
+	s.Record(Req{Key: "k", Model: "m", Source: "s", Status: 400, OK: false})
+	snap := s.Snapshot(0, "")
+	bs, ok := snap["by_status"].([]agrRow)
+	if !ok {
+		t.Fatalf("by_status missing: %#v", snap["by_status"])
+	}
+	if len(bs) != 3 {
+		t.Fatalf("want 3 status buckets, got %d: %#v", len(bs), bs)
+	}
+	if bs[0].Name != "200" || bs[0].OK != 1 || bs[0].Err != 0 {
+		t.Fatalf("bucket 200 wrong: %#v", bs[0])
+	}
+	if bs[1].Name != "400" || bs[1].Err != 1 {
+		t.Fatalf("bucket 400 wrong: %#v", bs[1])
+	}
+	if bs[2].Name != "402" || bs[2].Err != 1 {
+		t.Fatalf("bucket 402 wrong: %#v", bs[2])
+	}
+}
+
+func TestAuditRotation(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "audit.jsonl")
+	s := NewStats(10)
+	s.LoadAudit(path)
+
+	oldRotate, oldKeep := auditRotateBytes, auditKeepOld
+	auditRotateBytes, auditKeepOld = 64, 10
+	defer func() { auditRotateBytes, auditKeepOld = oldRotate, oldKeep }()
+
+	oldFiles := func() []string {
+		matches, _ := filepath.Glob(path + ".*.old")
+		return matches
+	}
+
+	for i := 0; i < 3; i++ {
+		s.AppendAudit("ev", map[string]interface{}{"i": i})
+	}
+	if got := len(oldFiles()); got != 1 {
+		t.Fatalf("want 1 rotated file after first overflow, got %d", got)
+	}
+	if b, err := os.ReadFile(path); err != nil || len(b) == 0 {
+		t.Fatalf("active audit file must continue appending: %v %d bytes", err, len(b))
+	}
+
+	// seed 12 fake old files; the next rotation must prune back to keep=10
+	for i := 1; i <= 12; i++ {
+		name := fmt.Sprintf("%s.%010d.old", path, i)
+		_ = os.WriteFile(name, []byte("x\n"), 0644)
+	}
+	s.AppendAudit("ev", map[string]interface{}{"i": 98})
+	s.AppendAudit("ev", map[string]interface{}{"i": 99})
+	if got := len(oldFiles()); got != auditKeepOld {
+		t.Fatalf("want keeper %d old files, got %d", auditKeepOld, got)
+	}
+}
+
+func TestAuditRotationRecords(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "audit.jsonl")
+	s := NewStats(10)
+	s.LoadAudit(path)
+
+	oldRotate := auditRotateBytes
+	auditRotateBytes = 64
+	defer func() { auditRotateBytes = oldRotate }()
+
+	for i := 0; i < 5; i++ {
+		s.Record(Req{Key: "k", Model: "m", Source: "s", Status: 200, OK: true})
+	}
+	matches, _ := filepath.Glob(path + ".*.old")
+	if len(matches) != 1 {
+		t.Fatalf("Record must rotate too: got %d old files", len(matches))
+	}
+}