133 lines
3.0 KiB
Go
133 lines
3.0 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 main
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import (
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"bytes"
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"fmt"
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"io"
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"mime"
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"net/http"
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"os"
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"os/exec"
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"github.com/squat/kilo/pkg/mesh"
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)
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type graphHandler struct {
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mesh *mesh.Mesh
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granularity mesh.Granularity
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}
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func (h *graphHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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ns, err := h.mesh.Nodes().List()
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if err != nil {
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http.Error(w, fmt.Sprintf("failed to list nodes: %v", err), 500)
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return
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}
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ps, err := h.mesh.Peers().List()
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if err != nil {
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http.Error(w, fmt.Sprintf("failed to list peers: %v", err), 500)
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return
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}
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var hostname string
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subnet := mesh.DefaultKiloSubnet
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nodes := make(map[string]*mesh.Node)
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for _, n := range ns {
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if n.Ready() {
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nodes[n.Name] = n
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hostname = n.Name
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}
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if n.WireGuardIP != nil {
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subnet = n.WireGuardIP
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}
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}
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subnet.IP = subnet.IP.Mask(subnet.Mask)
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if len(nodes) == 0 {
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http.Error(w, "did not find any valid Kilo nodes in the cluster", 500)
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return
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}
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peers := make(map[string]*mesh.Peer)
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for _, p := range ps {
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if p.Ready() {
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peers[p.Name] = p
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}
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}
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topo, err := mesh.NewTopology(nodes, peers, h.granularity, hostname, 0, []byte{}, subnet, nodes[hostname].PersistentKeepalive, nil)
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if err != nil {
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http.Error(w, fmt.Sprintf("failed to create topology: %v", err), 500)
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return
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}
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dot, err := topo.Dot()
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if err != nil {
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http.Error(w, fmt.Sprintf("failed to generate graph: %v", err), 500)
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}
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buf := bytes.NewBufferString(dot)
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format := r.URL.Query().Get("format")
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if format == "" {
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format = "png"
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} else if format == ".dot" || format == ".gv" {
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// If the raw dot data is requested, return it as string.
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// This allows client-side rendering rather than server-side.
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w.Write(buf.Bytes())
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return
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}
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command := exec.Command("dot", "-T"+format)
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command.Stderr = os.Stderr
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stdin, err := command.StdinPipe()
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if err != nil {
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http.Error(w, err.Error(), 500)
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return
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}
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_, err = io.Copy(stdin, buf)
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if err != nil {
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http.Error(w, err.Error(), 500)
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return
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}
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err = stdin.Close()
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if err != nil {
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http.Error(w, err.Error(), 500)
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return
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}
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output, err := command.Output()
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if err != nil {
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http.Error(w, fmt.Sprintf("unable to execute dot: %v (is graphviz package installed?)", err), 500)
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return
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}
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mimeType := mime.TypeByExtension("." + format)
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if mimeType == "" {
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mimeType = "application/octet-stream"
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}
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w.Write(output)
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}
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type healthHandler struct {
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}
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func (h *healthHandler) ServeHTTP(w http.ResponseWriter, _ *http.Request) {
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w.WriteHeader(http.StatusOK)
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}
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