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dot.go
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dot.go
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// Copyright Project Contour Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package debug
import (
"fmt"
"html"
"io"
"github.com/projectcontour/contour/internal/dag"
"github.com/projectcontour/contour/internal/envoy"
)
// quick and dirty dot debugging package
type dotWriter struct {
Builder DagBuilder
}
// DagBuilder encapsulates only the Build aspect of the dag.Builder
type DagBuilder interface {
// Build builds and returns a new DAG
Build() *dag.DAG
}
type pair struct {
a, b any
}
type (
nodeCollection map[any]bool
edgeCollection map[pair]bool
)
func (dw *dotWriter) writeDot(w io.Writer) {
nodes, edges := collectDag(dw.Builder)
fmt.Fprintln(w, "digraph DAG {\nrankdir=\"LR\"")
printNodes(nodes, w)
printEdges(edges, w)
fmt.Fprintln(w, "}")
}
func collectDag(b DagBuilder) (nodeCollection, edgeCollection) {
nodes := map[any]bool{}
edges := map[pair]bool{}
// collect nodes and edges
for _, listener := range b.Build().Listeners {
nodes[listener] = true
for _, vhost := range listener.VirtualHosts {
edges[pair{listener, vhost}] = true
nodes[vhost] = true
for _, route := range vhost.Routes {
edges[pair{vhost, route}] = true
nodes[route] = true
clusters := route.Clusters
for _, mp := range route.MirrorPolicies {
if mp.Cluster != nil {
clusters = append(clusters, mp.Cluster)
}
}
for _, cluster := range clusters {
edges[pair{route, cluster}] = true
nodes[cluster] = true
if service := cluster.Upstream; service != nil {
edges[pair{cluster, service}] = true
nodes[service] = true
}
}
}
}
for _, vhost := range listener.SecureVirtualHosts {
edges[pair{listener, vhost}] = true
nodes[vhost] = true
for _, route := range vhost.Routes {
edges[pair{vhost, route}] = true
nodes[route] = true
clusters := route.Clusters
for _, mp := range route.MirrorPolicies {
if mp.Cluster != nil {
clusters = append(clusters, mp.Cluster)
}
}
for _, cluster := range clusters {
edges[pair{route, cluster}] = true
nodes[cluster] = true
if service := cluster.Upstream; service != nil {
edges[pair{cluster, service}] = true
nodes[service] = true
}
}
}
if vhost.TCPProxy != nil {
edges[pair{vhost, vhost.TCPProxy}] = true
nodes[vhost.TCPProxy] = true
for _, cluster := range vhost.TCPProxy.Clusters {
edges[pair{vhost.TCPProxy, cluster}] = true
nodes[cluster] = true
if service := cluster.Upstream; service != nil {
edges[pair{cluster, service}] = true
nodes[service] = true
}
}
}
if vhost.Secret != nil {
edges[pair{vhost, vhost.Secret}] = true
nodes[vhost.Secret] = true
}
}
if listener.TCPProxy != nil {
edges[pair{listener, listener.TCPProxy}] = true
nodes[listener.TCPProxy] = true
for _, cluster := range listener.TCPProxy.Clusters {
edges[pair{listener.TCPProxy, cluster}] = true
nodes[cluster] = true
if service := cluster.Upstream; service != nil {
edges[pair{cluster, service}] = true
nodes[service] = true
}
}
}
}
return nodes, edges
}
func printNodes(nodes nodeCollection, w io.Writer) {
// print nodes
for node := range nodes {
switch node := node.(type) {
case *dag.Listener:
fmt.Fprintf(w, `"%p" [shape=record, label="{listener|%s:%d}"]`+"\n", node, html.EscapeString(node.Address), node.Port)
case *dag.VirtualHost:
fmt.Fprintf(w, `"%p" [shape=record, label="{http://%s}"]`+"\n", node, html.EscapeString(node.Name))
case *dag.SecureVirtualHost:
fmt.Fprintf(w, `"%p" [shape=record, label="{https://%s}"]`+"\n", node, html.EscapeString(node.VirtualHost.Name))
case *dag.Route:
fmt.Fprintf(w, `"%p" [shape=record, label="{%s}"]`+"\n", node, html.EscapeString(node.PathMatchCondition.String()))
case *dag.Cluster:
fmt.Fprintf(w, `"%p" [shape=record, label="{cluster|{%s|weight %d}}"]`+"\n", node, html.EscapeString(envoy.Clustername(node)), node.Weight)
case *dag.Service:
fmt.Fprintf(w, `"%p" [shape=record, label="{service|%s/%s:%d}"]`+"\n",
node, html.EscapeString(node.Weighted.ServiceNamespace), html.EscapeString(node.Weighted.ServiceName), node.Weighted.ServicePort.Port)
case *dag.Secret:
fmt.Fprintf(w, `"%p" [shape=record, label="{secret|%s/%s}"]`+"\n", node, html.EscapeString(node.Namespace()), html.EscapeString(node.Name()))
case *dag.TCPProxy:
fmt.Fprintf(w, `"%p" [shape=record, label="{tcpproxy}"]`+"\n", node)
}
}
}
func printEdges(edges edgeCollection, w io.Writer) {
// print edges
for edge := range edges {
fmt.Fprintf(w, `"%p" -> "%p"`+"\n", edge.a, edge.b)
}
}