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graphviz.go
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graphviz.go
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// Mgmt
// Copyright (C) 2013-2021+ James Shubin and the project contributors
// Written by James Shubin <[email protected]> and the project contributors
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package pgraph // TODO: this should be a subpackage
import (
"fmt"
"html"
"io/ioutil"
"os"
"os/exec"
"strconv"
"syscall"
)
const (
ptrLabels = true
ptrLabelsSize = 10
)
// Graphviz outputs the graph in graphviz format.
// https://en.wikipedia.org/wiki/DOT_%28graph_description_language%29
func (g *Graph) Graphviz() (out string) {
//digraph g {
// label="hello world";
// node [shape=box];
// A [label="A"];
// B [label="B"];
// C [label="C"];
// D [label="D"];
// E [label="E"];
// A -> B [label=f];
// B -> C [label=g];
// D -> E [label=h];
//}
out += fmt.Sprintf("digraph \"%s\" {\n", g.GetName())
out += fmt.Sprintf("\tlabel=\"%s\";\n", g.GetName())
//out += "\tnode [shape=box];\n"
str := ""
// XXX: add determinism to this loop
for i := range g.Adjacency() { // reverse paths
v1 := html.EscapeString(i.String()) // 1st vertex
if ptrLabels {
text := fmt.Sprintf("%p", i)
small := fmt.Sprintf("<FONT POINT-SIZE=\"%d\">%s</FONT>", ptrLabelsSize, text)
out += fmt.Sprintf("\t\"%p\" [label=<%s<BR />%s>];\n", i, v1, small)
} else {
out += fmt.Sprintf("\t\"%p\" [label=<%s>];\n", i, v1)
}
for j := range g.Adjacency()[i] {
k := g.Adjacency()[i][j]
//v2 := html.EscapeString(j.String()) // 2nd vertex
e := html.EscapeString(k.String()) // edge
// use str for clearer output ordering
//if fmtBoldFn(k) { // TODO: add this sort of formatting
// str += fmt.Sprintf("\t\"%s\" -> \"%s\" [label=<%s>,style=bold];\n", i, j, k)
//} else {
if false { // XXX: don't need the labels for edges
text := fmt.Sprintf("%p", k)
small := fmt.Sprintf("<FONT POINT-SIZE=\"%d\">%s</FONT>", ptrLabelsSize, text)
str += fmt.Sprintf("\t\"%p\" -> \"%p\" [label=<%s<BR />%s>];\n", i, j, e, small)
} else {
str += fmt.Sprintf("\t\"%p\" -> \"%p\" [label=<%s>];\n", i, j, e)
}
//}
}
}
out += str
out += "}\n"
return
}
// ExecGraphviz writes out the graphviz data and runs the correct graphviz
// filter command.
func (g *Graph) ExecGraphviz(program, filename, hostname string) error {
switch program {
case "dot", "neato", "twopi", "circo", "fdp":
default:
return fmt.Errorf("invalid graphviz program selected")
}
if filename == "" {
return fmt.Errorf("no filename given")
}
if hostname != "" {
filename = fmt.Sprintf("%s@%s", filename, hostname)
}
// run as a normal user if possible when run with sudo
uid, err1 := strconv.Atoi(os.Getenv("SUDO_UID"))
gid, err2 := strconv.Atoi(os.Getenv("SUDO_GID"))
err := ioutil.WriteFile(filename, []byte(g.Graphviz()), 0644)
if err != nil {
return fmt.Errorf("error writing to filename")
}
if err1 == nil && err2 == nil {
if err := os.Chown(filename, uid, gid); err != nil {
return fmt.Errorf("error changing file owner")
}
}
path, err := exec.LookPath(program)
if err != nil {
return fmt.Errorf("the Graphviz program is missing")
}
out := fmt.Sprintf("%s.png", filename)
cmd := exec.Command(path, "-Tpng", fmt.Sprintf("-o%s", out), filename)
if err1 == nil && err2 == nil {
cmd.SysProcAttr = &syscall.SysProcAttr{}
cmd.SysProcAttr.Credential = &syscall.Credential{
Uid: uint32(uid),
Gid: uint32(gid),
}
}
_, err = cmd.Output()
if err != nil {
return fmt.Errorf("error writing to image")
}
return nil
}