func main() {
var (
bytes []byte
data map[string]service
err error
graph *gographviz.Graph
project string
)
logger = stdlog.GetFromFlags()
project = ""
// Load docker-compose.yml
bytes, err = ioutil.ReadFile("docker-compose.yml")
if err != nil {
abort(err.Error())
}
// Parse it as YML
data = make(map[string]service, 5)
yaml.Unmarshal(bytes, &data)
if err != nil {
abort(err.Error())
}
// Create directed graph
graph = gographviz.NewGraph()
graph.SetName(project)
graph.SetDir(true)
// Add legend
graph.AddSubGraph(project, "cluster_legend", map[string]string{"label": "Legend"})
graph.AddNode("cluster_legend", "legend_service", map[string]string{"label": "service"})
graph.AddNode("cluster_legend", "legend_service_with_ports",
map[string]string{
"label": "\"service with exposed ports\\n80:80 443:443\\n--volume1[:host_dir1]\\n--volume2[:host_dir2]\"",
"shape": "box"})
graph.AddEdge("legend_service", "legend_service_with_ports", true, map[string]string{"label": "links"})
graph.AddEdge("legend_service_with_ports", "legend_service", true, map[string]string{"label": "volumes_from", "style": "dashed"})
// Round one: populate nodes
for name, service := range data {
var attrs = map[string]string{"label": name}
if service.Ports != nil {
attrs["label"] += "\\n" + strings.Join(service.Ports, " ")
attrs["shape"] = "box"
}
if service.Volumes != nil {
attrs["label"] += "\\n--" + strings.Join(service.Volumes, "\\n--")
}
attrs["label"] = fmt.Sprintf("\"%s\"", attrs["label"])
graph.AddNode(project, name, attrs)
}
// Round two: populate connections
for name, service := range data {
// links
if service.Links != nil {
for _, linkTo := range service.Links {
if strings.Contains(linkTo, ":") {
linkTo = strings.Split(linkTo, ":")[0]
}
graph.AddEdge(name, linkTo, true, nil)
}
}
// volumes_from
if service.VolumesFrom != nil {
for _, linkTo := range service.VolumesFrom {
graph.AddEdge(name, linkTo, true, map[string]string{"style": "dotted"})
}
}
}
fmt.Print(graph)
}