forked from influxdata/telegraf
-
Notifications
You must be signed in to change notification settings - Fork 0
/
mqtt_consumer.go
327 lines (272 loc) · 8.31 KB
/
mqtt_consumer.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
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
package mqtt_consumer
import (
"context"
"errors"
"fmt"
"log"
"strings"
"time"
"github.com/eclipse/paho.mqtt.golang"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/internal/tls"
"github.com/influxdata/telegraf/plugins/inputs"
"github.com/influxdata/telegraf/plugins/parsers"
)
var (
// 30 Seconds is the default used by paho.mqtt.golang
defaultConnectionTimeout = internal.Duration{Duration: 30 * time.Second}
defaultMaxUndeliveredMessages = 1000
)
type ConnectionState int
type empty struct{}
type semaphore chan empty
const (
Disconnected ConnectionState = iota
Connecting
Connected
)
type MQTTConsumer struct {
Servers []string
Topics []string
Username string
Password string
QoS int `toml:"qos"`
ConnectionTimeout internal.Duration `toml:"connection_timeout"`
MaxUndeliveredMessages int `toml:"max_undelivered_messages"`
parser parsers.Parser
// Legacy metric buffer support; deprecated in v0.10.3
MetricBuffer int
PersistentSession bool
ClientID string `toml:"client_id"`
tls.ClientConfig
client mqtt.Client
acc telegraf.TrackingAccumulator
state ConnectionState
subscribed bool
sem semaphore
messages map[telegraf.TrackingID]bool
ctx context.Context
cancel context.CancelFunc
}
var sampleConfig = `
## MQTT broker URLs to be used. The format should be scheme://host:port,
## schema can be tcp, ssl, or ws.
servers = ["tcp://localhost:1883"]
## QoS policy for messages
## 0 = at most once
## 1 = at least once
## 2 = exactly once
##
## When using a QoS of 1 or 2, you should enable persistent_session to allow
## resuming unacknowledged messages.
qos = 0
## Connection timeout for initial connection in seconds
connection_timeout = "30s"
## Maximum messages to read from the broker that have not been written by an
## output. For best throughput set based on the number of metrics within
## each message and the size of the output's metric_batch_size.
##
## For example, if each message from the queue contains 10 metrics and the
## output metric_batch_size is 1000, setting this to 100 will ensure that a
## full batch is collected and the write is triggered immediately without
## waiting until the next flush_interval.
# max_undelivered_messages = 1000
## Topics to subscribe to
topics = [
"telegraf/host01/cpu",
"telegraf/+/mem",
"sensors/#",
]
# if true, messages that can't be delivered while the subscriber is offline
# will be delivered when it comes back (such as on service restart).
# NOTE: if true, client_id MUST be set
persistent_session = false
# If empty, a random client ID will be generated.
client_id = ""
## username and password to connect MQTT server.
# username = "telegraf"
# password = "metricsmetricsmetricsmetrics"
## Optional TLS Config
# tls_ca = "/etc/telegraf/ca.pem"
# tls_cert = "/etc/telegraf/cert.pem"
# tls_key = "/etc/telegraf/key.pem"
## Use TLS but skip chain & host verification
# insecure_skip_verify = false
## Data format to consume.
## Each data format has its own unique set of configuration options, read
## more about them here:
## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
data_format = "influx"
`
func (m *MQTTConsumer) SampleConfig() string {
return sampleConfig
}
func (m *MQTTConsumer) Description() string {
return "Read metrics from MQTT topic(s)"
}
func (m *MQTTConsumer) SetParser(parser parsers.Parser) {
m.parser = parser
}
func (m *MQTTConsumer) Start(acc telegraf.Accumulator) error {
m.state = Disconnected
if m.PersistentSession && m.ClientID == "" {
return errors.New("persistent_session requires client_id")
}
if m.QoS > 2 || m.QoS < 0 {
return fmt.Errorf("qos value must be 0, 1, or 2: %d", m.QoS)
}
if m.ConnectionTimeout.Duration < 1*time.Second {
return fmt.Errorf("connection_timeout must be greater than 1s: %s", m.ConnectionTimeout.Duration)
}
m.acc = acc.WithTracking(m.MaxUndeliveredMessages)
m.ctx, m.cancel = context.WithCancel(context.Background())
opts, err := m.createOpts()
if err != nil {
return err
}
m.client = mqtt.NewClient(opts)
m.state = Connecting
m.connect()
return nil
}
func (m *MQTTConsumer) connect() error {
if token := m.client.Connect(); token.Wait() && token.Error() != nil {
err := token.Error()
m.state = Disconnected
return err
}
log.Printf("I! [inputs.mqtt_consumer] Connected %v", m.Servers)
m.state = Connected
m.sem = make(semaphore, m.MaxUndeliveredMessages)
m.messages = make(map[telegraf.TrackingID]bool)
// Only subscribe on first connection when using persistent sessions. On
// subsequent connections the subscriptions should be stored in the
// session, but the proper way to do this is to check the connection
// response to ensure a session was found.
if !m.PersistentSession || !m.subscribed {
topics := make(map[string]byte)
for _, topic := range m.Topics {
topics[topic] = byte(m.QoS)
}
subscribeToken := m.client.SubscribeMultiple(topics, m.recvMessage)
subscribeToken.Wait()
if subscribeToken.Error() != nil {
m.acc.AddError(fmt.Errorf("subscription error: topics: %s: %v",
strings.Join(m.Topics[:], ","), subscribeToken.Error()))
}
m.subscribed = true
}
return nil
}
func (m *MQTTConsumer) onConnectionLost(c mqtt.Client, err error) {
m.acc.AddError(fmt.Errorf("connection lost: %v", err))
log.Printf("D! [inputs.mqtt_consumer] Disconnected %v", m.Servers)
m.state = Disconnected
return
}
func (m *MQTTConsumer) recvMessage(c mqtt.Client, msg mqtt.Message) {
for {
select {
case track := <-m.acc.Delivered():
_, ok := m.messages[track.ID()]
if !ok {
// Added by a previous connection
continue
}
<-m.sem
// No ack, MQTT does not support durable handling
delete(m.messages, track.ID())
case m.sem <- empty{}:
err := m.onMessage(m.acc, msg)
if err != nil {
m.acc.AddError(err)
<-m.sem
}
return
}
}
}
func (m *MQTTConsumer) onMessage(acc telegraf.TrackingAccumulator, msg mqtt.Message) error {
metrics, err := m.parser.Parse(msg.Payload())
if err != nil {
return err
}
topic := msg.Topic()
for _, metric := range metrics {
metric.AddTag("topic", topic)
}
id := acc.AddTrackingMetricGroup(metrics)
m.messages[id] = true
return nil
}
func (m *MQTTConsumer) Stop() {
if m.state == Connected {
log.Printf("D! [inputs.mqtt_consumer] Disconnecting %v", m.Servers)
m.client.Disconnect(200)
log.Printf("D! [inputs.mqtt_consumer] Disconnected %v", m.Servers)
m.state = Disconnected
}
m.cancel()
}
func (m *MQTTConsumer) Gather(acc telegraf.Accumulator) error {
if m.state == Disconnected {
m.state = Connecting
log.Printf("D! [inputs.mqtt_consumer] Connecting %v", m.Servers)
m.connect()
}
return nil
}
func (m *MQTTConsumer) createOpts() (*mqtt.ClientOptions, error) {
opts := mqtt.NewClientOptions()
opts.ConnectTimeout = m.ConnectionTimeout.Duration
if m.ClientID == "" {
opts.SetClientID("Telegraf-Consumer-" + internal.RandomString(5))
} else {
opts.SetClientID(m.ClientID)
}
tlsCfg, err := m.ClientConfig.TLSConfig()
if err != nil {
return nil, err
}
if tlsCfg != nil {
opts.SetTLSConfig(tlsCfg)
}
user := m.Username
if user != "" {
opts.SetUsername(user)
}
password := m.Password
if password != "" {
opts.SetPassword(password)
}
if len(m.Servers) == 0 {
return opts, fmt.Errorf("could not get host infomations")
}
for _, server := range m.Servers {
// Preserve support for host:port style servers; deprecated in Telegraf 1.4.4
if !strings.Contains(server, "://") {
log.Printf("W! [inputs.mqtt_consumer] Server %q should be updated to use `scheme://host:port` format", server)
if tlsCfg == nil {
server = "tcp://" + server
} else {
server = "ssl://" + server
}
}
opts.AddBroker(server)
}
opts.SetAutoReconnect(false)
opts.SetKeepAlive(time.Second * 60)
opts.SetCleanSession(!m.PersistentSession)
opts.SetConnectionLostHandler(m.onConnectionLost)
return opts, nil
}
func init() {
inputs.Add("mqtt_consumer", func() telegraf.Input {
return &MQTTConsumer{
ConnectionTimeout: defaultConnectionTimeout,
MaxUndeliveredMessages: defaultMaxUndeliveredMessages,
state: Disconnected,
}
})
}