forked from cloudfoundry/bosh-agent
-
Notifications
You must be signed in to change notification settings - Fork 0
/
timeout_nats_client.go
195 lines (161 loc) · 4.31 KB
/
timeout_nats_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
package mbus
import (
"math/rand"
"time"
"code.cloudfoundry.org/clock"
"github.com/cloudfoundry/yagnats"
)
var _ yagnats.NATSClient = &TimeoutNatsClient{}
const (
defaultTimeout = 5 * time.Minute
publishTimeout = 10 * time.Minute
)
type TimeoutNatsClient struct {
client yagnats.NATSClient
clock clock.Clock
}
func NewTimeoutNatsClient(client yagnats.NATSClient, clock clock.Clock) *TimeoutNatsClient {
return &TimeoutNatsClient{
client: client,
clock: clock,
}
}
func (c *TimeoutNatsClient) Ping() bool {
complete := make(chan bool)
go func() {
complete <- c.client.Ping()
}()
timeout := c.clock.NewTimer(defaultTimeout)
select {
case success := <-complete:
timeout.Stop()
return success
case <-timeout.C():
panic("Connect call to NATSClient took too long, exiting so connections are reset")
}
}
func (c *TimeoutNatsClient) Connect(connectionProvider yagnats.ConnectionProvider) error {
complete := make(chan error)
go func() {
complete <- c.client.Connect(connectionProvider)
}()
timeout := c.clock.NewTimer(defaultTimeout)
select {
case err := <-complete:
timeout.Stop()
return err
case <-timeout.C():
panic("Connect call to NATSClient took too long, exiting so connections are reset")
}
}
func (c *TimeoutNatsClient) Disconnect() {
complete := make(chan bool)
go func() {
c.client.Disconnect()
complete <- true
}()
timeout := c.clock.NewTimer(defaultTimeout)
select {
case <-complete:
timeout.Stop()
return
case <-timeout.C():
panic("Disconnect call to NATSClient took too long, exiting so connections are reset")
}
}
func (c *TimeoutNatsClient) Publish(subject string, payload []byte) error {
complete := make(chan error)
go func() {
complete <- c.client.Publish(subject, payload)
}()
// We want to randomize the publish timeout to prevent all agents from
// exiting at the same time
jitter := rand.Float64()*0.5 + 0.75
timeout := c.clock.NewTimer(time.Duration(jitter * float64(publishTimeout)))
select {
case err := <-complete:
timeout.Stop()
return err
case <-timeout.C():
panic("Publish call to NATSClient took too long, exiting so connections are reset")
}
}
func (c *TimeoutNatsClient) PublishWithReplyTo(subject, reply string, payload []byte) error {
panic("not implemented")
}
func (c *TimeoutNatsClient) Subscribe(subject string, callback yagnats.Callback) (int64, error) {
type result struct {
subscriberID int64
err error
}
complete := make(chan result)
go func() {
id, err := c.client.Subscribe(subject, callback)
complete <- result{
subscriberID: id,
err: err,
}
}()
timeout := c.clock.NewTimer(defaultTimeout)
select {
case result := <-complete:
timeout.Stop()
return result.subscriberID, result.err
case <-timeout.C():
panic("Subscribe call to NATSClient took too long, exiting so connections are reset")
}
}
func (c *TimeoutNatsClient) SubscribeWithQueue(subject, queue string, callback yagnats.Callback) (int64, error) {
type result struct {
subscriberID int64
err error
}
complete := make(chan result)
go func() {
id, err := c.client.SubscribeWithQueue(subject, queue, callback)
complete <- result{
subscriberID: id,
err: err,
}
}()
timeout := c.clock.NewTimer(defaultTimeout)
select {
case result := <-complete:
timeout.Stop()
return result.subscriberID, result.err
case <-timeout.C():
panic("SubscribeWithQueue call to NATSClient took too long, exiting so connections are reset")
}
}
func (c *TimeoutNatsClient) Unsubscribe(subscription int64) error {
complete := make(chan error)
go func() {
complete <- c.client.Unsubscribe(subscription)
}()
timeout := c.clock.NewTimer(defaultTimeout)
select {
case err := <-complete:
timeout.Stop()
return err
case <-timeout.C():
panic("Unsubscribe call to NATSClient took too long, exiting so connections are reset")
}
}
func (c *TimeoutNatsClient) UnsubscribeAll(subject string) {
complete := make(chan bool)
go func() {
c.client.UnsubscribeAll(subject)
complete <- true
}()
timeout := c.clock.NewTimer(defaultTimeout)
select {
case <-complete:
timeout.Stop()
return
case <-timeout.C():
panic("UnsubscribeAll call to NATSClient took too long, exiting so connections are reset")
}
}
func (c *TimeoutNatsClient) BeforeConnectCallback(callback func()) {
c.client.BeforeConnectCallback(callback)
}