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package main
import (
"encoding/json"
"fmt"
"log"
"net/http"
"strconv"
"github.com/gorilla/mux"
"git.darknebu.la/GalaxySimulator/structs"
)
var (
treeArray []structs.Quadtree
)
// Get a subtree by searching a given element and returning its children recursively
func getSubtreeHandler(w http.ResponseWriter, r *http.Request) {
// set the content type to json (looks fancy in firefox :D)
w.Header().Set("Content-Type", "application/json")
// parse the mux variables
vars := mux.Vars(r)
getIndex, strconvErr := strconv.ParseInt(vars["treeindex"], 10, 0)
if strconvErr != nil {
panic(strconvErr)
}
log.Println(getIndex)
// Convert the data to json
jsonData, jsonMarshalerError := json.Marshal(treeArray[getIndex])
if jsonMarshalerError != nil {
panic(jsonMarshalerError)
}
// print the jsonData to the ResponseWriter
_, printTreeErr := fmt.Fprintf(w, "%v\n", string(jsonData))
if printTreeErr != nil {
panic(printTreeErr)
}
log.Printf("The getSubtree endpoint was accessed.\n")
}
// newTreeHandler creates a new tree and adds ot the the treeArray
func newTreeHandler(w http.ResponseWriter, r *http.Request) {
// set the content type to json (looks fancy in firefox :D)
w.Header().Set("Content-Type", "application/json")
// get the star by parsing http-post parameters
errParseForm := r.ParseForm() // parse the POST form
if errParseForm != nil { // handle errors
panic(errParseForm)
}
// default values
x := 0.0
y := 0.0
width := 0.0
// values from the user
xTmp, _ := strconv.ParseFloat(r.Form.Get("x"), 64) // x
yTmp, _ := strconv.ParseFloat(r.Form.Get("y"), 64) // y
widthTmp, _ := strconv.ParseFloat(r.Form.Get("w"), 64) // bounding box width
// assign the values
if xTmp != 0 {
x = xTmp
}
if yTmp != 0 {
y = yTmp
}
if widthTmp != 0 {
width = widthTmp
}
// generate a new tree and add it to the treeArray
newTree := structs.NewQuadtree(structs.BoundingBox{
Center: structs.Vec2{
X: x,
Y: y,
},
Width: width,
})
log.Println(newTree.Boundary)
treeArray = append(treeArray, *newTree)
// convert the tree to json format
jsonData, jsonMarshalErr := json.Marshal(newTree)
if jsonMarshalErr != nil {
panic(jsonMarshalErr)
}
// return the new tree as json
_, _ = fmt.Fprintf(w, "%v", string(jsonData))
log.Printf("The newTree endpoint was accessed.\n")
}
// printAllHandler prints all the trees in the treeArray
func printAllHandler(w http.ResponseWriter, r *http.Request) { // set the content type to json (looks fancy in firefox :D)
w.Header().Set("Content-Type", "application/json")
// Convert the data to json
jsonData, jsonMarshalerError := json.Marshal(treeArray)
if jsonMarshalerError != nil {
panic(jsonMarshalerError)
}
// print the jsonData to the ResponseWriter
_, printTreeErr := fmt.Fprintf(w, "%v\n", string(jsonData))
if printTreeErr != nil {
panic(printTreeErr)
}
log.Printf("The printAll endpoint was accessed.\n")
}
// this insert handler inserts a given star using http queries
func insertHandler(w http.ResponseWriter, r *http.Request) {
// get the tree id in which the star should be inserted
vars := mux.Vars(r)
treeindex, _ := strconv.ParseInt(vars["treeindex"], 10, 0)
_, _ = fmt.Fprintln(w, treeindex)
// get the star by parsing http-post parameters
errParseForm := r.ParseForm() // parse the POST form
if errParseForm != nil { // handle errors
panic(errParseForm)
}
// parse the values from the post parameters
x, _ := strconv.ParseFloat(r.Form.Get("x"), 64)
y, _ := strconv.ParseFloat(r.Form.Get("y"), 64)
vx, _ := strconv.ParseFloat(r.Form.Get("vx"), 64)
vy, _ := strconv.ParseFloat(r.Form.Get("vy"), 64)
m, _ := strconv.ParseFloat(r.Form.Get("m"), 64)
log.Println("------------------------------------------------------------------------------------------------")
log.Printf("[---] Inserting x: %f\ty: %f", x, y)
// build the star that should be inserted
newStar := structs.Star2D{
C: structs.Vec2{
X: x,
Y: y,
},
V: structs.Vec2{
X: vx,
Y: vy,
},
M: m,
}
treeArray[treeindex].Insert(newStar)
}
// Simple index Handler
// TODO: Display some kind of help
// TODO: Insert an api-documentation
func indexHandler(w http.ResponseWriter, r *http.Request) {
var _, _ = fmt.Fprintf(w, "Hello from the db-container!")
log.Printf("The indexHandler was accessed.")
var _, _ = fmt.Fprintln(w, "Insert a star using > $ curl --data \"x=250&y=250&vx=0.1&vy=0.2&m=3\" http://localhost:8123/insert/0")
}
func drawTreeHandler(w http.ResponseWriter, r *http.Request) {
log.Println("The drawTreeHandler was accessed.")
vars := mux.Vars(r)
treeindex, _ := strconv.ParseInt(vars["treeindex"], 10, 0)
log.Println(treeindex)
if treeArray[treeindex] != (structs.Quadtree{}) {
log.Println(treeArray[treeindex])
treeArray[treeindex].Draw("/public/quadtree.png")
}
http.ServeFile(w, r, "/public/quadtree.png")
}
func main() {
router := mux.NewRouter()
router.HandleFunc("/", indexHandler).Methods("GET")
router.HandleFunc("/get/{treeindex}", getSubtreeHandler).Methods("GET")
router.HandleFunc("/new", newTreeHandler).Methods("POST")
router.HandleFunc("/insert/{treeindex}", insertHandler).Methods("POST")
router.HandleFunc("/printall", printAllHandler).Methods("GET")
router.HandleFunc("/drawtree/{treeindex}", drawTreeHandler).Methods("GET")
log.Fatal(http.ListenAndServe(":8015", router))
}
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