Allow nodes to have no private IPs. Nodes without private IPs will automatically be put into their own location.
178 lines
5.8 KiB
Go
178 lines
5.8 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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"strings"
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"github.com/awalterschulze/gographviz"
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"github.com/squat/kilo/pkg/wireguard"
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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.OutputOrder), "nodesfirst"); err != nil {
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return "", fmt.Errorf("failed to set output ordering")
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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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var endpoint *wireguard.Endpoint
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if j == s.leader {
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wg = s.wireGuardIP
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endpoint = s.endpoint
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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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var priv net.IP
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if s.privateIPs != nil {
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priv = s.privateIPs[j]
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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], priv, wg, endpoint)); 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, nil)
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leaders[i] = graphEscape(s.hostnames[s.leader])
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}
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meshGraph(g, leaders, nil)
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if err := g.AddSubGraph("kilo", graphEscape("cluster_peers"), nil); err != nil {
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return "", fmt.Errorf("failed to add peer subgraph")
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}
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if err := g.AddAttr(graphEscape("cluster_peers"), string(gographviz.Label), graphEscape("peers")); err != nil {
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return "", fmt.Errorf("failed to add label to peer subgraph")
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}
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if err := g.AddAttr(graphEscape("cluster_peers"), string(gographviz.Style), `"dashed,rounded"`); err != nil {
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return "", fmt.Errorf("failed to add style to peer subgraph")
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}
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for j := range t.peers {
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if err := g.AddNode(graphEscape("cluster_peers"), graphEscape(t.peers[j].Name), nodeAttrs); err != nil {
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return "", fmt.Errorf("failed to add peer node to peer subgraph")
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}
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if err := g.Nodes.Lookup[graphEscape(t.peers[j].Name)].Attrs.Add(string(gographviz.Label), peerLabel(t.peers[j])); err != nil {
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return "", fmt.Errorf("failed to add label to peer node")
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}
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}
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meshPeers(g, leaders, g.Relations.SortedChildren(graphEscape("cluster_peers")), nil)
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return g.String(), nil
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}
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func meshGraph(g *gographviz.Graph, nodes []string, attrs gographviz.Attrs) {
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if attrs == nil {
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attrs = make(gographviz.Attrs)
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attrs[gographviz.Dir] = "both"
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}
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for i := range nodes {
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for j := i + 1; j < len(nodes); j++ {
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if i == j {
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continue
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}
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g.Edges.Add(&gographviz.Edge{Src: nodes[i], Dst: nodes[j], Dir: true, Attrs: attrs})
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}
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}
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}
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func meshSubGraph(g *gographviz.Graph, nodes []string, leader int, attrs gographviz.Attrs) {
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if attrs == nil {
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attrs = make(gographviz.Attrs)
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attrs[gographviz.Dir] = "both"
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}
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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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g.Edges.Add(&gographviz.Edge{Src: nodes[leader], Dst: nodes[i], Dir: true, Attrs: attrs})
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}
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}
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func meshPeers(g *gographviz.Graph, nodes, peers []string, attrs gographviz.Attrs) {
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if attrs == nil {
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attrs = make(gographviz.Attrs)
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attrs[gographviz.Dir] = "both"
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attrs[gographviz.Style] = "dashed"
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}
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for i := range nodes {
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for j := range peers {
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g.Edges.Add(&gographviz.Edge{Src: nodes[i], Dst: peers[j], Dir: true, Attrs: attrs})
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}
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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_location_%s", name))
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}
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func nodeLabel(location, name string, cidr *net.IPNet, priv, wgIP net.IP, endpoint *wireguard.Endpoint) string {
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label := []string{
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location,
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name,
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cidr.String(),
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}
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if priv != nil {
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label = append(label, priv.String())
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}
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if wgIP != nil {
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label = append(label, wgIP.String())
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}
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if endpoint != nil {
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label = append(label, endpoint.String())
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}
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return graphEscape(strings.Join(label, "\n"))
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}
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func peerLabel(peer *Peer) string {
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return graphEscape(fmt.Sprintf("%s\n%s\n", peer.Name, peer.Endpoint.String()))
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}
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