// Layout runs the dot program to layout the graph.
// If format is "" uses dot format, else specify an output renderer, e.g. "svg".
// The Graphviz dot program must be installed in your path.
func Layout(graph *gv.Graph, format string) ([]byte, error) {
f, err := ioutil.TempFile("", "gogp")
if err != nil {
return nil, err
}
// write to tmpfile
w := bufio.NewWriter(f)
fmt.Fprint(w, graph.String())
w.Flush()
f.Close()
file := f.Name()
defer os.Remove(file)
// process with dot
args := []string{file}
if format != "" {
args = append(args, "-T"+format)
}
var outData, errData bytes.Buffer
cmd := exec.Command("dot", args...)
cmd.Stdout = &outData
cmd.Stderr = &errData
if err := cmd.Run(); err != nil {
if errData.Len() > 0 {
err = errors.New(errData.String())
}
return nil, err
}
return outData.Bytes(), nil
}
func DrawPool(graph *ggv.Graph, name string, p Pool) {
fpath := poolPath + "/" + name
attr := map[string]string{}
lbl := " | <f1> HealthCheckEvery : " + p.HealthCheckEvery + " | <f2> Degraded : " + p.Degraded +
" | <f3> Critical : " + p.Critical + " | <f4> Healthz : " + p.Healthz + " | <f5> Request : " + p.Request
attr["shape"] = "record"
attr["label"] = "\"{ <f0>" + name + lbl + "} \""
attr["color"], attr["fillcolor"], attr["fontcolor"] = GetColorAttr(fpath)
attr["fontname"] = font
attr["style"] = "\"filled\""
graph.AddNode(graphName, "\""+fpath+"\"", attr)
}
func DrawTrie(graph *ggv.Graph, name string, t Trie) {
fpath := triePath + "/" + name
attr := map[string]string{}
lbl := " | <f1> Rules : "
for _, v := range t.Rules {
lbl = lbl + v + ", "
}
lbl = lbl[0 : len(lbl)-2]
attr["shape"] = "record"
attr["label"] = "\"{ <f0>" + name + lbl + "} \""
attr["color"], attr["fillcolor"], attr["fontcolor"] = GetColorAttr(fpath)
attr["fontname"] = font
attr["style"] = "\"filled\""
graph.AddNode(graphName, "\""+fpath+"\"", attr)
}
func DrawHosts(graph *ggv.Graph, parentName string, hosts []string) {
fpath := poolPath + "/" + parentName + "/hosts"
attr := map[string]string{}
lbl := ""
i := 1
for _, v := range hosts {
lbl = lbl + "| <f" + strconv.FormatInt(int64(i), 10) + "> " + v + " "
}
attr["shape"] = "record"
attr["label"] = "\"{ <f0> Hosts " + lbl + "} \""
attr["color"], attr["fillcolor"], attr["fontcolor"] = GetColorAttr(fpath)
attr["fontname"] = font
attr["style"] = "\"filled\""
graph.AddNode(graphName, "\""+fpath+"\"", attr)
graph.AddEdge("\""+poolPath+"/"+parentName+"\"", "\""+fpath+"\"", true, PoolEdgeAttr)
}
func DrawRule(graph *ggv.Graph, name string, r Rule) {
fpath := rulePath + "/" + name
attr := map[string]string{}
lbl := " | <f1> Type : " + r.Type + " | <f2> Value : " + r.Value
if r.Pool != "" {
lbl = lbl + "| <f3> " + StrikethroughString("Next : "+r.Next) + " | <f4> Pool : " + r.Pool
} else {
lbl = lbl + "| <f3> Next : " + r.Next + " | <f4> " + StrikethroughString("Pool : "+r.Pool)
}
attr["shape"] = "record"
attr["label"] = "\"{ <f0>" + name + lbl + "} \""
attr["color"], attr["fillcolor"], attr["fontcolor"] = GetColorAttr(fpath)
attr["fontname"] = font
attr["style"] = "\"filled\""
graph.AddNode(graphName, "\""+fpath+"\"", attr)
}