/
connect.go
60 lines (50 loc) · 1.11 KB
/
connect.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
package db
import (
"context"
"os"
"sync"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/options"
)
var (
mongoOnce sync.Once
mongoTwice sync.Once
db_name string
connUri string
db *mongo.Database
client *mongo.Client
)
func getClient() (*mongo.Client, error) {
var err error
// Using Do once to evalutate the function only once!
mongoOnce.Do(func() {
connUri = os.Getenv("MONGO_URI")
clientOptions := options.Client().ApplyURI(connUri)
client, err = mongo.Connect(context.TODO(), clientOptions)
err2 := client.Ping(context.TODO(), nil)
if err2 != nil {
err = err2
}
})
return client, err
}
func GetDatabase() *mongo.Database {
mongoTwice.Do(func() {
client, err := getClient()
if err != nil {
panic(err)
}
db_name = os.Getenv("MONGO_DB")
db = client.Database(db_name)
})
return db
}
func GetUserCol() *mongo.Collection {
return GetDatabase().Collection("users")
}
func GetChatCol() *mongo.Collection {
return GetDatabase().Collection("chats")
}
func GetMessageCol() *mongo.Collection {
return GetDatabase().Collection("messages")
}