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
|
package main
import (
"encoding/json"
"fmt"
"log"
"net/http"
"net/url"
"strconv"
"github.com/gorilla/mux"
"git.darknebu.la/GalaxySimulator/structs"
)
var (
treeArray []*structs.Node
)
// indexHandler
func indexHandler(w http.ResponseWriter, r *http.Request) {
infostring := `Galaxy Simulator Database
API: /api/v1/...
.../new
.../insert{treeindex}`
_, _ = fmt.Fprintf(w, infostring)
}
// 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")
fmt.Println("Creating a new tree")
// get the star by parsing http-post parameters
errParseForm := r.ParseForm() // parse the POST form
if errParseForm != nil { // handle errors
panic(errParseForm)
}
// default values
width := 0.0
// value from the user
widthTmp, _ := strconv.ParseFloat(r.Form.Get("w"), 64) // bounding box width
log.Printf("width: %f", widthTmp)
if widthTmp != 0 {
width = widthTmp
}
// generate a new tree and add it to the treeArray
newTree := structs.NewRoot(width)
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.Println(treeArray[0])
log.Printf("The printAll endpoint was accessed.\n")
}
// insertStarHandler inserts a star into the given tree
func insertStarHandler(w http.ResponseWriter, r *http.Request) {
log.Println("The insert handler was accessed")
// get the treeindex in which the star should be inserted into
vars := mux.Vars(r)
treeindex, _ := strconv.ParseInt(vars["treeindex"], 10, 0)
// get the star by parsing http-post parameters
errParseForm := r.ParseForm() // parse the POST form
if errParseForm != nil { // handle errors
panic(errParseForm)
}
// get the star coordinates
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.Printf("treeindex: %d", treeindex)
log.Printf("x: %f", x)
log.Printf("y: %f", y)
log.Printf("vx: %f", vx)
log.Printf("vy: %f", vy)
log.Printf("m: %f", m)
s1 := structs.Star2D{
C: structs.Vec2{x, y},
V: structs.Vec2{vx, vy},
M: m,
}
log.Printf("s1: %v", s1)
treeArray[treeindex].Insert(s1)
fmt.Println("-------------")
fmt.Println(treeArray)
fmt.Println("-------------")
log.Println("Done inserting the star")
}
// calculate the forces acting inbetween all the stars
func calcallHandler(w http.ResponseWriter, r *http.Request) {
// iterate over all the stars and make a POST request to the simulator with the star
// get the treeindex
vars := mux.Vars(r)
treeindex, _ := strconv.ParseInt(vars["treeindex"], 10, 0)
listOfStars := treeArray[treeindex].GetAllStars()
for _, star := range listOfStars {
// http post request to the simulator traefik with the star in the form
fmt.Println(star)
apiurl := "simu.docker.localhost"
response, err := http.PostForm(apiurl, url.Values{
"x": {fmt.Sprintf("%f", star.C.X)},
"y": {fmt.Sprintf("%f", star.C.Y)},
"vx": {fmt.Sprintf("%f", star.V.X)},
"vy": {fmt.Sprintf("%f", star.V.X)},
"m": {fmt.Sprintf("%f", star.M)},
})
if err != nil {
panic(err)
}
fmt.Println(response)
}
}
func main() {
router := mux.NewRouter()
router.HandleFunc("/", indexHandler).Methods("GET")
router.HandleFunc("/api/v1/new", newTreeHandler).Methods("POST")
router.HandleFunc("/api/v1/printall", printAllHandler).Methods("GET")
router.HandleFunc("/api/v1/insert/{treeindex}", insertStarHandler).Methods("POST")
router.HandleFunc("/api/v1/calcall/{treeindex}", calcallHandler).Methods("GET")
log.Println("Serving the database on port 8043: This is for local testing only, remove when done!)")
log.Fatal(http.ListenAndServe(":8043", router))
}
|
