dnstt_exporter/internal/dnstt/collector_test.go

package dnstt

import (
	"net/netip"
	"testing"
	"time"
)

func TestCollectorTracksActiveAndPeakClients(t *testing.T) {
	now := time.Unix(1000, 0)
	c := NewCollector([]string{"tunnel.example.com"}, WithNow(func() time.Time { return now }))

	c.RecordQuery("tunnel.example.com", "client-a", 120)
	c.RecordQuery("tunnel.example.com", "client-b", 80)
	c.RecordResponse("tunnel.example.com", 200)

	snapshot := c.Snapshot()
	tunnel := snapshot.Tunnels["tunnel.example.com"]
	if tunnel.ActiveClients != 2 {
		t.Fatalf("active clients = %d, want 2", tunnel.ActiveClients)
	}
	if tunnel.PeakClients != 2 {
		t.Fatalf("peak clients = %d, want 2", tunnel.PeakClients)
	}
	if tunnel.TotalSessions != 2 {
		t.Fatalf("total sessions = %d, want 2", tunnel.TotalSessions)
	}
	if tunnel.TotalQueries != 2 {
		t.Fatalf("queries = %d, want 2", tunnel.TotalQueries)
	}
	if tunnel.BytesIn != 200 {
		t.Fatalf("bytes in = %d, want 200", tunnel.BytesIn)
	}
	if tunnel.BytesOut != 200 {
		t.Fatalf("bytes out = %d, want 200", tunnel.BytesOut)
	}

	now = now.Add(ClientTimeout + time.Second)
	snapshot = c.Snapshot()
	tunnel = snapshot.Tunnels["tunnel.example.com"]
	if tunnel.ActiveClients != 0 {
		t.Fatalf("active clients after timeout = %d, want 0", tunnel.ActiveClients)
	}
	if tunnel.PeakClients != 2 {
		t.Fatalf("peak clients after timeout = %d, want 2", tunnel.PeakClients)
	}
}

func TestCollectorMatchesSubdomainsToRegisteredTunnel(t *testing.T) {
	now := time.Unix(1000, 0)
	c := NewCollector([]string{"tunnel.example.com"}, WithNow(func() time.Time { return now }))

	c.RecordQuery("abcd.tunnel.example.com", "client-a", 120)

	tunnel := c.Snapshot().Tunnels["tunnel.example.com"]
	if tunnel.TotalQueries != 1 {
		t.Fatalf("queries = %d, want 1", tunnel.TotalQueries)
	}
	if tunnel.ActiveClients != 1 {
		t.Fatalf("active clients = %d, want 1", tunnel.ActiveClients)
	}
}

func TestCollectorUpdatesPeakWhenActiveClientChangesGeoKey(t *testing.T) {
	now := time.Unix(1000, 0)
	firstResolver := netip.MustParseAddr("192.0.2.53")
	secondResolver := netip.MustParseAddr("198.51.100.53")
	c := NewCollector(
		[]string{"tunnel.example.com"},
		WithNow(func() time.Time { return now }),
		WithGeoResolver(fakeGeoResolver{
			labelNames: []string{"asn"},
			labels: map[netip.Addr]GeoLabels{
				firstResolver:  {ASN: "64500"},
				secondResolver: {ASN: "64501"},
			},
		}),
	)

	c.RecordQueryFrom("tunnel.example.com", "client-a", firstResolver, 120)
	c.RecordQueryFrom("tunnel.example.com", "client-a", secondResolver, 120)

	foundChangedASN := false
	for _, series := range c.Snapshot().Tunnels["tunnel.example.com"].Series {
		if series.ASN == "64501" && series.PeakClients != 1 {
			t.Fatalf("peak clients for changed ASN = %d, want 1", series.PeakClients)
		}
		if series.ASN == "64501" {
			foundChangedASN = true
		}
	}
	if !foundChangedASN {
		t.Fatal("series for changed ASN not found")
	}
}