d11854f4e8
The graph of dependencies in golang is a DAG, and as such doesn't allow cycles. Clean up this lib so that it eventually doesn't import our resources module or anything else which might want to import it. This patch makes adjacency private, and adds a generalized key store to the graph struct.
119 lines
3.3 KiB
Go
119 lines
3.3 KiB
Go
// Mgmt
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// Copyright (C) 2013-2017+ James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package pgraph // TODO: this should be a subpackage
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import (
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"fmt"
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"io/ioutil"
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"os"
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"os/exec"
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"strconv"
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"syscall"
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)
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// Graphviz outputs the graph in graphviz format.
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// https://en.wikipedia.org/wiki/DOT_%28graph_description_language%29
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func (g *Graph) Graphviz() (out string) {
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//digraph g {
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// label="hello world";
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// node [shape=box];
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// A [label="A"];
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// B [label="B"];
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// C [label="C"];
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// D [label="D"];
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// E [label="E"];
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// A -> B [label=f];
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// B -> C [label=g];
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// D -> E [label=h];
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//}
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out += fmt.Sprintf("digraph %s {\n", g.GetName())
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out += fmt.Sprintf("\tlabel=\"%s\";\n", g.GetName())
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//out += "\tnode [shape=box];\n"
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str := ""
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for i := range g.adjacency { // reverse paths
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out += fmt.Sprintf("\t\"%s\" [label=\"%s[%s]\"];\n", i.GetName(), i.GetKind(), i.GetName())
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for j := range g.adjacency[i] {
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k := g.adjacency[i][j]
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// use str for clearer output ordering
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if k.Notify {
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str += fmt.Sprintf("\t\"%s\" -> \"%s\" [label=\"%s\",style=bold];\n", i.GetName(), j.GetName(), k.Name)
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} else {
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str += fmt.Sprintf("\t\"%s\" -> \"%s\" [label=\"%s\"];\n", i.GetName(), j.GetName(), k.Name)
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}
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}
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}
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out += str
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out += "}\n"
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return
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}
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// ExecGraphviz writes out the graphviz data and runs the correct graphviz
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// filter command.
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func (g *Graph) ExecGraphviz(program, filename, hostname string) error {
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switch program {
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case "dot", "neato", "twopi", "circo", "fdp":
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default:
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return fmt.Errorf("invalid graphviz program selected")
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}
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if filename == "" {
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return fmt.Errorf("no filename given")
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}
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if hostname != "" {
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filename = fmt.Sprintf("%s@%s", filename, hostname)
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}
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// run as a normal user if possible when run with sudo
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uid, err1 := strconv.Atoi(os.Getenv("SUDO_UID"))
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gid, err2 := strconv.Atoi(os.Getenv("SUDO_GID"))
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err := ioutil.WriteFile(filename, []byte(g.Graphviz()), 0644)
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if err != nil {
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return fmt.Errorf("error writing to filename")
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}
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if err1 == nil && err2 == nil {
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if err := os.Chown(filename, uid, gid); err != nil {
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return fmt.Errorf("error changing file owner")
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}
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}
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path, err := exec.LookPath(program)
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if err != nil {
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return fmt.Errorf("the Graphviz program is missing")
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}
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out := fmt.Sprintf("%s.png", filename)
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cmd := exec.Command(path, "-Tpng", fmt.Sprintf("-o%s", out), filename)
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if err1 == nil && err2 == nil {
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cmd.SysProcAttr = &syscall.SysProcAttr{}
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cmd.SysProcAttr.Credential = &syscall.Credential{
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Uid: uint32(uid),
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Gid: uint32(gid),
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}
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}
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_, err = cmd.Output()
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if err != nil {
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return fmt.Errorf("error writing to image")
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}
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return nil
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}
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