2425a06cd8
This commit adds support for defining arbitrary peers that should have access to the VPN. In k8s, this is accomplished using the new Peer CRD.
102 lines
3.5 KiB
Go
102 lines
3.5 KiB
Go
// Copyright 2019 the Kilo authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package mesh
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import (
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"fmt"
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"net"
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"github.com/awalterschulze/gographviz"
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)
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// Dot generates a Graphviz graph of the Topology in DOT fomat.
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func (t *Topology) Dot() (string, error) {
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g := gographviz.NewGraph()
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g.Name = "kilo"
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if err := g.AddAttr("kilo", string(gographviz.Label), graphEscape(t.subnet.String())); err != nil {
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return "", fmt.Errorf("failed to add label to graph")
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}
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if err := g.AddAttr("kilo", string(gographviz.LabelLOC), "t"); err != nil {
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return "", fmt.Errorf("failed to add label location to graph")
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}
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if err := g.AddAttr("kilo", string(gographviz.Overlap), "false"); err != nil {
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return "", fmt.Errorf("failed to disable graph overlap")
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}
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if err := g.SetDir(true); err != nil {
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return "", fmt.Errorf("failed to set direction")
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}
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leaders := make([]string, len(t.segments))
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nodeAttrs := map[string]string{
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string(gographviz.Shape): "ellipse",
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}
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for i, s := range t.segments {
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if err := g.AddSubGraph("kilo", subGraphName(s.location), nil); err != nil {
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return "", fmt.Errorf("failed to add subgraph")
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}
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if err := g.AddAttr(subGraphName(s.location), string(gographviz.Label), graphEscape(s.location)); err != nil {
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return "", fmt.Errorf("failed to add label to subgraph")
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}
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if err := g.AddAttr(subGraphName(s.location), string(gographviz.Style), `"dashed,rounded"`); err != nil {
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return "", fmt.Errorf("failed to add style to subgraph")
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}
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for j := range s.cidrs {
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if err := g.AddNode(subGraphName(s.location), graphEscape(s.hostnames[j]), nodeAttrs); err != nil {
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return "", fmt.Errorf("failed to add node to subgraph")
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}
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var wg net.IP
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if j == s.leader {
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wg = s.wireGuardIP
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if err := g.Nodes.Lookup[graphEscape(s.hostnames[j])].Attrs.Add(string(gographviz.Rank), "1"); err != nil {
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return "", fmt.Errorf("failed to add rank to node")
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}
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}
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if err := g.Nodes.Lookup[graphEscape(s.hostnames[j])].Attrs.Add(string(gographviz.Label), nodeLabel(s.location, s.hostnames[j], s.cidrs[j], s.privateIPs[j], wg)); err != nil {
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return "", fmt.Errorf("failed to add label to node")
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}
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}
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meshSubGraph(g, g.Relations.SortedChildren(subGraphName(s.location)), s.leader)
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leaders[i] = graphEscape(s.hostnames[s.leader])
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}
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meshSubGraph(g, leaders, 0)
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return g.String(), nil
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}
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func meshSubGraph(g *gographviz.Graph, nodes []string, leader int) {
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for i := range nodes {
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if i == leader {
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continue
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}
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a := make(gographviz.Attrs)
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a[gographviz.Dir] = "both"
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g.Edges.Add(&gographviz.Edge{Src: nodes[leader], Dst: nodes[i], Dir: true, Attrs: a})
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}
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}
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func graphEscape(s string) string {
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return fmt.Sprintf("\"%s\"", s)
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}
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func subGraphName(name string) string {
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return graphEscape(fmt.Sprintf("cluster_%s", name))
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}
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func nodeLabel(location, name string, cidr *net.IPNet, priv, wgIP net.IP) string {
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var wg string
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if wgIP != nil {
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wg = wgIP.String()
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}
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return graphEscape(fmt.Sprintf("%s\n%s\n%s\n%s\n%s", location, name, cidr.String(), priv.String(), wg))
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}
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