/
main.go
122 lines (105 loc) · 2.42 KB
/
main.go
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
package main
import (
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"strconv"
"strings"
"time"
mux "github.com/gorilla/mux"
)
var url = "http://soiduplaan.tallinn.ee/gps.txt"
var port int
var markers map[string]map[string]string
func init() {
flag.IntVar(&port, "port", 5000, "port to run bus-server on")
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage: %v [options]\n\n", os.Args[0])
flag.PrintDefaults()
}
}
func main() {
flag.Parse()
markers = make(map[string]map[string]string)
portString := strconv.Itoa(port)
stop := make(chan bool)
go func() {
for {
select {
case <-time.After(1 * time.Second):
update()
case <-stop:
return
}
}
}()
r := mux.NewRouter()
r.HandleFunc("/gps", gps)
http.Handle("/", &CorsServer{r})
fmt.Printf("bus-server listening on port %s\n", portString)
err := http.ListenAndServe(":"+portString, nil)
if err != nil {
panic(err)
}
}
type CorsServer struct {
r *mux.Router
}
func (s *CorsServer) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
if origin := req.Header.Get("Origin"); origin != "" {
rw.Header().Set("Access-Control-Allow-Origin", origin)
rw.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE")
rw.Header().Set("Access-Control-Allow-Headers",
"Accept, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization")
}
// Stop here if its Preflighted OPTIONS request
if req.Method == "OPTIONS" {
return
}
// Lets Gorilla work
s.r.ServeHTTP(rw, req)
}
func gps(res http.ResponseWriter, req *http.Request) {
jsonString, err := json.Marshal(markers)
if err != nil {
fmt.Fprintln(res, err)
return
}
res.Header().Set("Content-Type", "application/json")
fmt.Fprintf(res, "%s", jsonString)
}
func update() {
gps, _ := download(url)
lines := strings.Split(string(gps[:]), "\n")
for i := 0; i < len(lines); i++ {
item := strings.Split(lines[i], ",")
if len(item) < 7 {
continue
}
marker := make(map[string]string)
marker["id"] = item[6]
marker["type"] = item[0]
marker["number"] = item[1]
marker["long"] = item[2]
marker["lat"] = item[3]
marker["dir"] = item[5]
markers[marker["id"]] = marker
}
log.Println("updated gps")
}
func download(uri string) ([]byte, error) {
res, err := http.Get(uri)
if err != nil {
log.Fatal(err)
}
defer res.Body.Close()
d, err := ioutil.ReadAll(res.Body)
if err != nil {
log.Fatal(err)
}
return d, err
}