-
Notifications
You must be signed in to change notification settings - Fork 0
/
websocket.go
143 lines (131 loc) · 2.85 KB
/
websocket.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
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
package main
import (
"github.com/gorilla/websocket"
"log"
"net/http"
"os"
"os/signal"
"strings"
"syscall"
)
var Upgrader = websocket.Upgrader{}
func DatabaseHandleFunc(database Database) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
connection, err := Upgrader.Upgrade(w, r, nil)
if err != nil {
log.Println(err)
return
}
for {
messageType, message, err := connection.ReadMessage()
if err != nil {
log.Println(err)
break
}
query := ParseQuery(string(message))
log.Println(query)
values := query.Execute(database)
if len(values) > 0 {
err = connection.WriteMessage(messageType, []byte(strings.Join(values, "\n")))
if err != nil {
log.Println(err)
break
}
}
}
err = connection.Close()
if err != nil {
log.Println(err)
}
}
}
func ReloadDatabase(database Database, filename string) error {
_, err := Exec(os.Getenv("DOWNLOAD_COMMAND"))
if err != nil {
return err
}
err = Load(database, filename)
if err != nil {
return err
}
return nil
}
func ReloadRemoteDatabase(url string) error {
if len(url) > 0 {
request, err := http.NewRequest("GET", url, nil)
if err != nil {
return err
}
client := &http.Client{}
_, err = client.Do(request)
if err != nil {
return err
}
}
return nil
}
func StoreDatabase(database Database, filename string) error {
err := Dump(database, filename)
if err != nil {
return err
}
_, err = Exec(os.Getenv("UPLOAD_COMMAND"))
if err != nil {
return err
}
err = ReloadRemoteDatabase(os.Getenv("RELOAD_URL"))
if err != nil {
return err
}
return nil
}
func NewContainer(filename string) (Database, *http.ServeMux, error) {
database := NewDatabase()
err := ReloadDatabase(database, filename)
if err != nil {
return database, nil, err
}
mux := http.NewServeMux()
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
http.ServeFile(w, r, "index.html")
})
mux.HandleFunc("/reload", func(w http.ResponseWriter, r *http.Request) {
err := ReloadDatabase(database, filename)
if err != nil {
log.Println(err)
}
})
mux.HandleFunc("/store", func(w http.ResponseWriter, r *http.Request) {
err := StoreDatabase(database, filename)
if err != nil {
log.Println(err)
}
})
mux.HandleFunc("/database", DatabaseHandleFunc(database))
return database, mux, nil
}
func main() {
filename := "database.txt"
database, mux, err := NewContainer(filename)
if err != nil {
log.Fatalln(err)
}
signals := make(chan os.Signal, 1)
signal.Notify(signals, syscall.SIGINT, syscall.SIGTERM)
go func() {
<-signals
err := StoreDatabase(database, filename)
if err != nil {
log.Fatalln(err)
}
os.Exit(0)
}()
port := "8080"
if len(os.Getenv("PORT")) > 0 {
port = os.Getenv("PORT")
}
err = http.ListenAndServe(":"+port, mux)
if err != nil {
log.Fatalln(err)
}
}