kilo/cmd/kgctl/graph.go

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// Copyright 2019 the Kilo 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 main
import (
"fmt"
"github.com/spf13/cobra"
"github.com/squat/kilo/pkg/mesh"
)
func graph() *cobra.Command {
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return &cobra.Command{
Use: "graph",
Short: "Generates a graph of the Kilo network",
RunE: runGraph,
}
}
func runGraph(_ *cobra.Command, _ []string) error {
ns, err := opts.backend.Nodes().List()
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if err != nil {
return fmt.Errorf("failed to list nodes: %v", err)
}
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ps, err := opts.backend.Peers().List()
if err != nil {
return fmt.Errorf("failed to list peers: %v", err)
}
// Obtain the Granularity by looking at the annotation of the first node.
if opts.granularity, err = optainGranularity(opts.granularity, ns); err != nil {
return fmt.Errorf("failed to obtain granularity: %w", err)
}
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var hostname string
subnet := mesh.DefaultKiloSubnet
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nodes := make(map[string]*mesh.Node)
for _, n := range ns {
if n.Ready() {
nodes[n.Name] = n
hostname = n.Name
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}
if n.WireGuardIP != nil {
subnet = n.WireGuardIP
}
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}
subnet.IP = subnet.IP.Mask(subnet.Mask)
if len(nodes) == 0 {
return fmt.Errorf("did not find any valid Kilo nodes in the cluster")
}
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peers := make(map[string]*mesh.Peer)
for _, p := range ps {
if p.Ready() {
peers[p.Name] = p
}
}
t, err := mesh.NewTopology(nodes, peers, opts.granularity, hostname, 0, []byte{}, subnet, nodes[hostname].PersistentKeepalive, nil)
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if err != nil {
return fmt.Errorf("failed to create topology: %v", err)
}
g, err := t.Dot()
if err != nil {
return fmt.Errorf("failed to generate graph: %v", err)
}
fmt.Println(g)
return nil
}