146 lines
3.5 KiB
Go
146 lines
3.5 KiB
Go
// 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 (
|
|
"bytes"
|
|
"fmt"
|
|
"io"
|
|
"mime"
|
|
"net"
|
|
"net/http"
|
|
"os"
|
|
"os/exec"
|
|
|
|
"github.com/squat/kilo/pkg/mesh"
|
|
)
|
|
|
|
type graphHandler struct {
|
|
mesh *mesh.Mesh
|
|
granularity mesh.Granularity
|
|
hostname *string
|
|
subnet *net.IPNet
|
|
}
|
|
|
|
func (h *graphHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
|
ns, err := h.mesh.Nodes().List()
|
|
if err != nil {
|
|
http.Error(w, fmt.Sprintf("failed to list nodes: %v", err), http.StatusInternalServerError)
|
|
return
|
|
}
|
|
ps, err := h.mesh.Peers().List()
|
|
if err != nil {
|
|
http.Error(w, fmt.Sprintf("failed to list peers: %v", err), http.StatusInternalServerError)
|
|
return
|
|
}
|
|
|
|
nodes := make(map[string]*mesh.Node)
|
|
for _, n := range ns {
|
|
if n.Ready() {
|
|
nodes[n.Name] = n
|
|
}
|
|
}
|
|
if len(nodes) == 0 {
|
|
http.Error(w, "did not find any valid Kilo nodes in the cluster", http.StatusInternalServerError)
|
|
return
|
|
}
|
|
peers := make(map[string]*mesh.Peer)
|
|
for _, p := range ps {
|
|
if p.Ready() {
|
|
peers[p.Name] = p
|
|
}
|
|
}
|
|
topo, err := mesh.NewTopology(nodes, peers, h.granularity, *h.hostname, 0, []byte{}, h.subnet, nodes[*h.hostname].PersistentKeepalive, nil)
|
|
if err != nil {
|
|
http.Error(w, fmt.Sprintf("failed to create topology: %v", err), http.StatusInternalServerError)
|
|
return
|
|
}
|
|
|
|
dot, err := topo.Dot()
|
|
if err != nil {
|
|
http.Error(w, fmt.Sprintf("failed to generate graph: %v", err), http.StatusInternalServerError)
|
|
}
|
|
|
|
buf := bytes.NewBufferString(dot)
|
|
|
|
format := r.URL.Query().Get("format")
|
|
switch format {
|
|
case "":
|
|
format = "svg"
|
|
case "dot", "gv":
|
|
// If the raw dot data is requested, return it as string.
|
|
// This allows client-side rendering rather than server-side.
|
|
w.Write(buf.Bytes())
|
|
return
|
|
|
|
case "svg", "png", "bmp", "fig", "gif", "json", "ps":
|
|
// Accepted format
|
|
|
|
default:
|
|
http.Error(w, "unsupported format", http.StatusInternalServerError)
|
|
return
|
|
}
|
|
|
|
layout := r.URL.Query().Get("layout")
|
|
switch layout {
|
|
case "":
|
|
layout = "circo"
|
|
|
|
case "circo", "dot", "neato", "twopi", "fdp":
|
|
// Accepted layout
|
|
|
|
default:
|
|
http.Error(w, "unsupported layout", http.StatusInternalServerError)
|
|
return
|
|
}
|
|
|
|
command := exec.Command("dot", "-K"+layout, "-T"+format)
|
|
command.Stderr = os.Stderr
|
|
|
|
stdin, err := command.StdinPipe()
|
|
if err != nil {
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
|
return
|
|
}
|
|
|
|
if _, err = io.Copy(stdin, buf); err != nil {
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
|
return
|
|
}
|
|
|
|
if err = stdin.Close(); err != nil {
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
|
return
|
|
}
|
|
|
|
output, err := command.Output()
|
|
if err != nil {
|
|
http.Error(w, "unable to render graph", http.StatusInternalServerError)
|
|
return
|
|
}
|
|
|
|
mimeType := mime.TypeByExtension("." + format)
|
|
if mimeType == "" {
|
|
mimeType = "application/octet-stream"
|
|
}
|
|
|
|
w.Header().Add("content-type", mimeType)
|
|
w.Write(output)
|
|
}
|
|
|
|
func healthHandler(w http.ResponseWriter, _ *http.Request) {
|
|
w.WriteHeader(http.StatusOK)
|
|
}
|