Log the rest of the request log's fields (closes #79)

Each request log line now has the fields "Request log" in SPEC.md lists
whose features are built: instance (SWWAF_INSTANCE_NAME), scheme,
request_id (a trusted proxy's X-Request-ID or a new one, sent on to the
app), forwarded_for, client_group, content_type, content_length, the
headers SWWAF_LOG_REQUEST_HEADERS names, has_authorization, has_cookie,
websocket, response_content_type, cache_control, location, counts and
the timings. Authorization, Cookie and Set-Cookie values are never
logged. An entry of SWWAF_LOG_REQUEST_HEADERS that is not a header name,
or is Host or Transfer-Encoding, stops the start.

Deviation: counts has request totals only.
Deviation: SWWAF_INSTANCE_NAME is on request lines only.

Model: opus-5-5

internal/ratelimit/ratelimit_test.go

@@ -62,14 +62,14 @@ func TestHitGivesTheLimitAndTheRequestsCounted(t *testing.T) {
 	start := midnight()
 
 	for range limit {
-		_, over := limiter.Count(client, start)
+		_, _, over := limiter.Count(client, start)
 		if over {
 			t.Fatal("a request within the limit is over it")
 		}
 	}
 
 	// Over both limits; the minute's is named, with the four requests.
-	hit, over := limiter.Count(client, start)
+	_, hit, over := limiter.Count(client, start)
 
 	want := ratelimit.Hit{Window: minute, Limit: limit, Requests: limit + 1}
 	if !over || hit != want {
@@ -78,6 +78,29 @@ func TestHitGivesTheLimitAndTheRequestsCounted(t *testing.T) {
 	}
 }
 
+func TestCountGivesTheRequestsInEachWindow(t *testing.T) {
+	t.Parallel()
+
+	limiter := ratelimit.New(ratelimit.Limits{})
+	client := netip.MustParsePrefix("203.0.113.9/32")
+	start := midnight()
+
+	for range 3 {
+		limiter.Count(client, start)
+	}
+
+	// A quarter into the next hour, the minute has only this request. The
+	// hour still covers three quarters of the bucket before, with its three
+	// requests, which count 2.25, and this one: 3.25. The day covers all
+	// four.
+	counts, _, _ := limiter.Count(client, start.Add(time.Hour+time.Hour/4))
+
+	want := ratelimit.Counts{Minute: 1, Hour: 3.25, Day: 4}
+	if counts != want {
+		t.Errorf("counts %+v, want %+v", counts, want)
+	}
+}
+
 func TestResetSetsTheCountsBackToZero(t *testing.T) {
 	t.Parallel()
 
@@ -238,7 +261,7 @@ func wantCount(
 ) {
 	t.Helper()
 
-	hit, _ := limiter.Count(client, now)
+	_, hit, _ := limiter.Count(client, now)
 	if hit.Window != want {
 		t.Errorf("request from %s at %s is over %q, want %q",
 			client, now.Format(time.RFC3339), hit.Window, want)