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package main
import (
"fmt"
"html/template"
"log"
"net/http"
"net/url"
"strconv"
"github.com/gorilla/mux"
)
type Page struct {
NewTree bool
X, Y, W float64
}
func overviewHandler(w http.ResponseWriter, r *http.Request) {
t := template.Must(template.ParseFiles(
"tmpl/overview.html",
"tmpl/header.html",
"tmpl/nav.html",
"tmpl/javascript.html",
))
templateExecuteError := t.ExecuteTemplate(w, "overview", &Page{})
if templateExecuteError != nil {
log.Println(templateExecuteError)
}
}
func newtreeHandler(w http.ResponseWriter, r *http.Request) {
log.Println("the new tree handler was accessed")
// if the method used to get the page is GET, simply respond with the tree-creation form
if r.Method == "GET" {
log.Println("using a GET method")
t := template.Must(template.ParseFiles(
"tmpl/newtree.html",
"tmpl/header.html",
"tmpl/nav.html",
"tmpl/javascript.html",
))
templateExecuteError := t.ExecuteTemplate(w, "newtree", &Page{})
if templateExecuteError != nil {
log.Println(templateExecuteError)
}
} else {
log.Println("using a POST method")
// get the values from the form
err := r.ParseForm()
log.Println(err)
log.Println("parsed the form")
x, _ := strconv.ParseFloat(r.Form["x"][0], 64) // x position of the midpoint of the tree
y, _ := strconv.ParseFloat(r.Form["y"][0], 64) // y position of the midpoint of the tree
width, _ := strconv.ParseFloat(r.Form["w"][0], 64) // width the the tree
dbip := r.Form["db-ip"][0] // ip address of the database
log.Println("parsed the form arguments")
// parse the template files
t := template.Must(template.ParseFiles(
"tmpl/newtree.html",
"tmpl/header.html",
"tmpl/nav.html",
"tmpl/javascript.html",
))
log.Println("parsed the template file")
// execute the template
templateExecuteError := t.ExecuteTemplate(w, "newtree", &Page{NewTree: true, X: x, Y: y, W: width})
log.Println("executed the template")
// handle potential errors
if templateExecuteError != nil {
log.Println(templateExecuteError)
}
log.Println("handled potential errors")
// create the new tree by accessing the api endpoint of the database
postUrl := fmt.Sprintf("http://%s/new", dbip)
log.Printf("the postURL: %s", postUrl)
log.Println("created the url for the post request")
// define the data that should be posted
formData := url.Values{
"x": r.Form["x"],
"y": r.Form["y"],
"w": r.Form["w"],
}
log.Println("created the form to be sent in the post request")
// make the http Post request
resp, err := http.PostForm(postUrl, formData)
log.Println("sent the post request")
// some debug messages
log.Printf("[ ] POST response: %v", resp)
log.Printf("[ ] POST err: %v", err)
}
}
func addstarsHandler(w http.ResponseWriter, r *http.Request) {
// if the method used to get the page is GET, simply respond with the add-stars form
if r.Method == "GET" {
log.Println("/addstars was accessed using a GET method")
t := template.Must(template.ParseFiles(
"tmpl/addstars.html",
"tmpl/header.html",
"tmpl/nav.html",
"tmpl/javascript.html",
))
templateExecuteError := t.ExecuteTemplate(w, "addstars", &Page{})
if templateExecuteError != nil {
log.Println(templateExecuteError)
}
} else {
log.Println("/addstars was accessed using a POST method")
// get the values from the form
_ = r.ParseForm()
log.Println("parsed the form")
// extract some information from the form
dbip := r.Form["dbip"][0] // ip address of the database
treeindex, _ := strconv.ParseInt(r.Form["tree"][0], 10, 64) // index of the tree
log.Println(dbip)
log.Println(treeindex)
log.Println("parsed the form arguments")
t := template.Must(template.ParseFiles(
"tmpl/addstars.html",
"tmpl/header.html",
"tmpl/nav.html",
"tmpl/javascript.html",
))
log.Println("parsed the template file")
templateExecuteError := t.ExecuteTemplate(w, "addstars", &Page{})
if templateExecuteError != nil {
log.Println(templateExecuteError)
}
log.Println("executed the template")
// create the new tree by accessing the api endpoint of the database
postUrl := fmt.Sprintf("http://%s/insert/%d", dbip, treeindex)
log.Printf("the postURL: %s", postUrl)
log.Println("created the url for the post request")
// define the data that should be posted
formData := url.Values{
"x": r.Form["x"],
"y": r.Form["y"],
"vx": r.Form["vx"],
"vy": r.Form["vy"],
"m": r.Form["mass"],
}
log.Println("created the form to be sent in the post request")
// make the http Post request
resp, err := http.PostForm(postUrl, formData)
log.Println("sent the post request")
// some debug messages
log.Printf("[ ] POST response: %v", resp)
log.Printf("[ ] POST err: %v", err)
}
}
func drawtreeHandler(w http.ResponseWriter, r *http.Request) {
}
func main() {
router := mux.NewRouter()
router.HandleFunc("/", overviewHandler).Methods("GET")
router.HandleFunc("/newtree", newtreeHandler).Methods("GET", "POST")
router.HandleFunc("/addstars", addstarsHandler).Methods("GET", "POST")
router.HandleFunc("/drawtree", drawtreeHandler).Methods("GET")
log.Fatal(http.ListenAndServe(":8429", router))
}
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