Give every IP lookup result the same fields (closes #200)

Every result of /ip/, /ip/{addr} and /api/v1/ip/{ip} now has every
field. A field without a value is null instead of left out, so an
address with no live route has all its route and AS fields set to null.
ptr is an empty list when there are no PTR names.

Two new fields, num_origins and origin_asns, give how many origin ASes
peers carry the netblock with, and which. The routing table's prefix
summary now lists them. asn still names the origin that most peers
carry.

first_seen is null, no longer the zero time, when the database has not
stored the netblock yet.

Model: opus-5-5

internal/server/handlers_table_internal_test.go

@@ -4,6 +4,8 @@ import (
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
+	"net/netip"
+	"reflect"
 	"slices"
 	"strconv"
 	"strings"
@@ -75,9 +77,10 @@ func get(t *testing.T, s *Server, path string) *httptest.ResponseRecorder {
 
 // TestIPLookupGivesTheOriginMostPeersCarry looks up an address in a prefix
 // with two origin ASes, through each IP lookup route. The answer names the
-// origin AS that more peers carry, counts every peer, and gives the time of
-// the prefix's newest kept route. The prefix's first-seen time and the AS's
-// WHOIS details come from the database.
+// origin AS that more peers carry, counts every peer, lists both origin ASes,
+// and gives the time of the prefix's newest kept route. The prefix's
+// first-seen time and the AS's WHOIS details come from the database. A WHOIS
+// detail the database does not hold is null.
 func TestIPLookupGivesTheOriginMostPeersCarry(t *testing.T) {
 	t.Parallel()
 
@@ -105,6 +108,26 @@ func TestIPLookupGivesTheOriginMostPeersCarry(t *testing.T) {
 		t.Fatalf("UpdateASNWHOIS: %v", err)
 	}
 
+	// The details the database does not hold, such as org_name, are null.
+	want := IPInfo{
+		Netblock:    new(testPrefixV4),
+		MaskLength:  new(netip.MustParsePrefix(testPrefixV4).Bits()),
+		IPVersion:   new(ipVersionV4),
+		NumPeers:    new(4),
+		ASN:         new(mostPeersASN),
+		NumOrigins:  new(2),
+		OriginASNs:  []int{mostPeersASN, fewerPeersASN},
+		ASName:      &whois.ASName,
+		CountryCode: &whois.CountryCode,
+		FirstSeen:   &firstSeen,
+		LastSeen:    new(testRouteTime(5)),
+	}
+
+	wantJSON, err := json.Marshal(want)
+	if err != nil {
+		t.Fatalf("encoding %+v: %v", want, err)
+	}
+
 	// ownAddressPath looks up the request's own address, which httptest
 	// gives as addrInTestPrefixV4.
 	for _, path := range []string{
@@ -115,22 +138,15 @@ func TestIPLookupGivesTheOriginMostPeersCarry(t *testing.T) {
 			Data IPLookupResponse `json:"data"`
 		}
 
-		err := json.Unmarshal(get(t, s, path).Body.Bytes(), &body)
-		if err != nil || len(body.Data.Results) != 1 ||
-			body.Data.Results[0].IPInfo == nil {
-			t.Fatalf("%s: answer %+v (%v), want one result with a route",
-				path, body.Data, err)
+		answer := get(t, s, path).Body.Bytes()
+
+		err := json.Unmarshal(answer, &body)
+		if err != nil || len(body.Data.Results) != 1 {
+			t.Fatalf("%s: answer %s (%v), want one result", path, answer, err)
 		}
 
-		got := body.Data.Results[0].IPInfo
-		if got.Netblock != testPrefixV4 || got.ASN != mostPeersASN ||
-			got.NumPeers != 4 || !got.LastSeen.Equal(testRouteTime(5)) ||
-			!got.FirstSeen.Equal(firstSeen) || got.ASName != whois.ASName ||
-			got.CountryCode != whois.CountryCode {
-			t.Errorf("%s: route %+v, want %s from AS%d, 4 peers, last seen %v, "+
-				"first seen %v, %s in %s", path, *got, testPrefixV4,
-				mostPeersASN, testRouteTime(5), firstSeen, whois.ASName,
-				whois.CountryCode)
+		if !reflect.DeepEqual(body.Data.Results[0].IPInfo, want) {
+			t.Errorf("%s: answer %s, want the fields %s", path, answer, wantJSON)
 		}
 	}
 }