forked from elastic/beats
-
Notifications
You must be signed in to change notification settings - Fork 0
/
client.go
196 lines (164 loc) · 3.35 KB
/
client.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
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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
package transport
import (
"crypto/tls"
"fmt"
"net"
"sync"
"time"
)
type Client struct {
dialer Dialer
network string
host string
conn net.Conn
mutex sync.Mutex
}
type Config struct {
Proxy *ProxyConfig
TLS *tls.Config
Timeout time.Duration
}
func MakeDialer(c *Config) (Dialer, error) {
var err error
dialer := NetDialer(c.Timeout)
dialer, err = ProxyDialer(c.Proxy, dialer)
if err != nil {
return nil, err
}
dialer = TLSDialer(c.TLS, c.Timeout, dialer)
return dialer, nil
}
func NewClient(c *Config, network, host string, defaultPort int) (*Client, error) {
// do some sanity checks regarding network and Config matching +
// address being parseable
switch network {
case "tcp", "tcp4", "tcp6":
case "udp", "udp4", "udp6":
if c.TLS == nil && c.Proxy == nil {
break
}
fallthrough
default:
return nil, fmt.Errorf("unsupported network type %v", network)
}
dialer, err := MakeDialer(c)
if err != nil {
return nil, err
}
return NewClientWithDialer(dialer, network, host, defaultPort)
}
func NewClientWithDialer(d Dialer, network, host string, defaultPort int) (*Client, error) {
// check address being parseable
host = fullAddress(host, defaultPort)
_, _, err := net.SplitHostPort(host)
if err != nil {
return nil, err
}
client := &Client{
dialer: d,
network: network,
host: host,
}
return client, nil
}
func (c *Client) Connect() error {
c.mutex.Lock()
defer c.mutex.Unlock()
if c.conn != nil {
_ = c.conn.Close()
c.conn = nil
}
conn, err := c.dialer.Dial(c.network, c.host)
if err != nil {
return err
}
c.conn = conn
return nil
}
func (c *Client) IsConnected() bool {
c.mutex.Lock()
b := c.conn != nil
c.mutex.Unlock()
return b
}
func (c *Client) Close() error {
c.mutex.Lock()
defer c.mutex.Unlock()
if c.conn != nil {
debugf("closing")
err := c.conn.Close()
c.conn = nil
return err
}
return nil
}
func (c *Client) getConn() net.Conn {
c.mutex.Lock()
conn := c.conn
c.mutex.Unlock()
return conn
}
func (c *Client) Read(b []byte) (int, error) {
conn := c.getConn()
if conn == nil {
return 0, ErrNotConnected
}
debugf("try read: %v", len(b))
n, err := conn.Read(b)
return n, c.handleError(err)
}
func (c *Client) Write(b []byte) (int, error) {
conn := c.getConn()
if conn == nil {
return 0, ErrNotConnected
}
n, err := c.conn.Write(b)
return n, c.handleError(err)
}
func (c *Client) LocalAddr() net.Addr {
conn := c.getConn()
if conn != nil {
return c.conn.LocalAddr()
}
return nil
}
func (c *Client) RemoteAddr() net.Addr {
conn := c.getConn()
if conn != nil {
return c.conn.LocalAddr()
}
return nil
}
func (c *Client) SetDeadline(t time.Time) error {
conn := c.getConn()
if conn == nil {
return ErrNotConnected
}
err := conn.SetDeadline(t)
return c.handleError(err)
}
func (c *Client) SetReadDeadline(t time.Time) error {
conn := c.getConn()
if conn == nil {
return ErrNotConnected
}
err := conn.SetReadDeadline(t)
return c.handleError(err)
}
func (c *Client) SetWriteDeadline(t time.Time) error {
conn := c.getConn()
if conn == nil {
return ErrNotConnected
}
err := conn.SetWriteDeadline(t)
return c.handleError(err)
}
func (c *Client) handleError(err error) error {
if err != nil {
debugf("handle error: %v", err)
if nerr, ok := err.(net.Error); !(ok && (nerr.Temporary() || nerr.Timeout())) {
_ = c.Close()
}
}
return err
}