1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
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))
}
|