// Render - Method for rendering DOT from base64 to image
func (dot *DotController) Render(res http.ResponseWriter, params martini.Params) {
format := params["format"]
data := params["data"]
err := dot.checkFormat(format)
if err != nil {
log.Println(err)
res.WriteHeader(http.StatusBadRequest)
res.Write([]byte(fmt.Sprintln(err)))
return
}
graph, err := base64.StdEncoding.DecodeString(data)
if err != nil {
log.Println(err)
res.WriteHeader(http.StatusBadRequest)
return
}
result, err := godotviz.DotRender(graph, format)
if err != nil {
log.Println(err)
res.WriteHeader(http.StatusInternalServerError)
return
}
res.Header().Set("Content-Type", "image/"+format)
res.Write(result)
}
// main - implements simple processing DOT language from stdin to stdout
// Example:
// echo 'graph {a -- b a -- b b -- c }' | go run dotpipeviz.go png > ~/graph.png
func main() {
fileFormat := os.Args[1]
data, err := ioutil.ReadAll(os.Stdin)
if err != nil {
log.Fatal(err)
}
result, err := godotviz.DotRender(data, fileFormat)
if err != nil {
log.Fatal(err)
}
os.Stdout.Write(result)
}