show more details of a node's internet connections

in the details panel, instead of showing connections to/from the
internet as "TheInternet <port>", we now show "<dns-name>(<ip_addr>)
<port>" (or just "<ip_addr> <port>" if we don't have a dns name).

Fixes #1713.

render/detailed/connections.go

@@ -57,9 +57,9 @@ func (s connectionsByID) Less(i, j int) bool { return s[i].ID < s[j].ID }
 
 // Intermediate type used as a key to dedupe rows
 type connection struct {
-	remoteNodeID string
-	addr         string // for internet nodes only: the address
-	port         string // destination port
+	remoteNodeID          string
+	remoteAddr, localAddr string // for internet nodes only
+	port                  string // destination port
 }
 
 type connectionCounters struct {
@@ -92,19 +92,31 @@ func (c *connectionCounters) add(outgoing bool, localNode, remoteNode, localEndp
 		return
 	}
 	// For internet nodes we break out individual addresses
-	if isInternetNode(localNode) {
-		if _, conn.addr, _, ok = report.ParseEndpointNodeID(localEndpoint.ID); !ok {
-			return
-		}
-		if set, ok := localEndpoint.Sets.Lookup(endpoint.ReverseDNSNames); ok && len(set) > 0 {
-			conn.addr = fmt.Sprintf("%s (%s)", set[0], conn.addr)
-		}
+	if conn.remoteAddr, ok = internetAddr(remoteNode, remoteEndpoint); !ok {
+		return
+	}
+	if conn.localAddr, ok = internetAddr(localNode, localEndpoint); !ok {
+		return
 	}
 
 	c.counted[connectionID] = struct{}{}
 	c.counts[conn]++
 }
 
+func internetAddr(node report.Node, ep report.Node) (string, bool) {
+	if !isInternetNode(node) {
+		return "", true
+	}
+	_, addr, _, ok := report.ParseEndpointNodeID(ep.ID)
+	if !ok {
+		return "", false
+	}
+	if set, ok := ep.Sets.Lookup(endpoint.ReverseDNSNames); ok && len(set) > 0 {
+		addr = fmt.Sprintf("%s (%s)", set[0], addr)
+	}
+	return addr, true
+}
+
 func (c *connectionCounters) rows(r report.Report, ns report.Nodes, includeLocal bool) []Connection {
 	output := []Connection{}
 	for row, count := range c.counts {
@@ -113,16 +125,19 @@ func (c *connectionCounters) rows(r report.Report, ns report.Nodes, includeLocal
 		// MakeNodeID(ns[row.remoteNodeID]). As we don't need the whole summary.
 		summary, _ := MakeNodeSummary(r, ns[row.remoteNodeID])
 		connection := Connection{
-			ID:       fmt.Sprintf("%s-%s-%s", row.remoteNodeID, row.addr, row.port),
+			ID:       fmt.Sprintf("%s-%s-%s-%s", row.remoteNodeID, row.remoteAddr, row.localAddr, row.port),
 			NodeID:   summary.ID,
 			Label:    summary.Label,
 			Linkable: true,
 		}
+		if row.remoteAddr != "" {
+			connection.Label = row.remoteAddr
+		}
 		if includeLocal {
 			connection.Metadata = append(connection.Metadata,
 				report.MetadataRow{
 					ID:       "foo",
-					Value:    row.addr,
+					Value:    row.localAddr,
 					Datatype: number,
 				})
 		}

render/detailed/node_test.go

@@ -25,8 +25,8 @@ func child(t *testing.T, r render.Renderer, id string) detailed.NodeSummary {
 	return s.SummarizeMetrics()
 }
 
-func connectionID(nodeID string) string {
-	return fmt.Sprintf("%s-%s-%d", nodeID, "", 80)
+func connectionID(nodeID string, addr string) string {
+	return fmt.Sprintf("%s-%s-%s-%d", nodeID, addr, "", 80)
 }
 
 func TestMakeDetailedHostNode(t *testing.T) {
@@ -153,7 +153,7 @@ func TestMakeDetailedHostNode(t *testing.T) {
 				Columns:    detailed.NormalColumns,
 				Connections: []detailed.Connection{
 					{
-						ID:       connectionID(fixture.ServerHostNodeID),
+						ID:       connectionID(fixture.ServerHostNodeID, ""),
 						NodeID:   fixture.ServerHostNodeID,
 						Label:    "server",
 						Linkable: true,
@@ -261,7 +261,7 @@ func TestMakeDetailedContainerNode(t *testing.T) {
 				Columns:    detailed.NormalColumns,
 				Connections: []detailed.Connection{
 					{
-						ID:       connectionID(fixture.ClientContainerNodeID),
+						ID:       connectionID(fixture.ClientContainerNodeID, ""),
 						NodeID:   fixture.ClientContainerNodeID,
 						Label:    "client",
 						Linkable: true,
@@ -279,9 +279,9 @@ func TestMakeDetailedContainerNode(t *testing.T) {
 						},
 					},
 					{
-						ID:       connectionID(render.IncomingInternetID),
+						ID:       connectionID(render.IncomingInternetID, fixture.RandomClientIP),
 						NodeID:   render.IncomingInternetID,
-						Label:    render.InboundMajor,
+						Label:    fixture.RandomClientIP,
 						Linkable: true,
 						Metadata: []report.MetadataRow{
 							{
@@ -381,7 +381,7 @@ func TestMakeDetailedPodNode(t *testing.T) {
 				Columns:    detailed.NormalColumns,
 				Connections: []detailed.Connection{
 					{
-						ID:       connectionID(fixture.ClientPodNodeID),
+						ID:       connectionID(fixture.ClientPodNodeID, ""),
 						NodeID:   fixture.ClientPodNodeID,
 						Label:    "pong-a",
 						Linkable: true,
@@ -399,9 +399,9 @@ func TestMakeDetailedPodNode(t *testing.T) {
 						},
 					},
 					{
-						ID:       connectionID(render.IncomingInternetID),
+						ID:       connectionID(render.IncomingInternetID, fixture.RandomClientIP),
 						NodeID:   render.IncomingInternetID,
-						Label:    render.InboundMajor,
+						Label:    fixture.RandomClientIP,
 						Linkable: true,
 						Metadata: []report.MetadataRow{
 							{