/
dialer.go
58 lines (50 loc) · 1.08 KB
/
dialer.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
package grpcutil
import (
"sync"
"google.golang.org/grpc"
)
// Dialer defines a grpc.ClientConn connection dialer.
type Dialer interface {
Dial(address string) (*grpc.ClientConn, error)
CloseConns() error
}
// NewDialer creates a Dialer.
func NewDialer(opts ...grpc.DialOption) Dialer {
return newDialer(opts...)
}
type dialer struct {
opts []grpc.DialOption
// A map from addresses to connections
connMap map[string]*grpc.ClientConn
lock sync.Mutex
}
func newDialer(opts ...grpc.DialOption) *dialer {
return &dialer{
opts: opts,
connMap: make(map[string]*grpc.ClientConn),
}
}
func (d *dialer) Dial(addr string) (*grpc.ClientConn, error) {
d.lock.Lock()
defer d.lock.Unlock()
if conn, ok := d.connMap[addr]; ok {
return conn, nil
}
conn, err := grpc.Dial(addr, d.opts...)
if err != nil {
return nil, err
}
d.connMap[addr] = conn
return conn, nil
}
func (d *dialer) CloseConns() error {
d.lock.Lock()
defer d.lock.Unlock()
for addr, conn := range d.connMap {
if err := conn.Close(); err != nil {
return err
}
delete(d.connMap, addr)
}
return nil
}