-
Notifications
You must be signed in to change notification settings - Fork 5.5k
/
sensu.go
418 lines (352 loc) · 9.33 KB
/
sensu.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
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
//go:generate ../../../tools/readme_config_includer/generator
package sensu
import (
"bytes"
_ "embed"
"encoding/json"
"fmt"
"io"
"math"
"net/http"
"net/url"
"os"
"path"
"strconv"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/config"
"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/internal/choice"
"github.com/influxdata/telegraf/plugins/common/tls"
"github.com/influxdata/telegraf/plugins/outputs"
)
//go:embed sample.conf
var sampleConfig string
const (
defaultURL = "http://127.0.0.1:3031"
defaultClientTimeout = 5 * time.Second
defaultContentType = "application/json; charset=utf-8"
)
type OutputMetadata struct {
Name string `json:"name"`
}
type OutputEntity struct {
Metadata *OutputMetadata `json:"metadata"`
}
type OutputCheck struct {
Metadata *OutputMetadata `json:"metadata"`
Status int `json:"status"`
Output string `json:"output"`
Issued int64 `json:"issued"`
OutputMetricHandlers []string `json:"output_metric_handlers"`
}
type OutputMetrics struct {
Handlers []string `json:"handlers"`
Metrics []*OutputMetric `json:"points"`
}
type OutputMetric struct {
Name string `json:"name"`
Tags []*OutputTag `json:"tags"`
Value interface{} `json:"value"`
Timestamp int64 `json:"timestamp"`
}
type OutputTag struct {
Name string `json:"name"`
Value string `json:"value"`
}
type OutputEvent struct {
Entity *OutputEntity `json:"entity,omitempty"`
Check *OutputCheck `json:"check"`
Metrics *OutputMetrics `json:"metrics"`
Timestamp int64 `json:"timestamp"`
}
type SensuEntity struct {
Name *string `toml:"name"`
Namespace *string `toml:"namespace"`
}
type SensuCheck struct {
Name *string `toml:"name"`
}
type SensuMetrics struct {
Handlers []string `toml:"handlers"`
}
type Sensu struct {
APIKey *string `toml:"api_key"`
AgentAPIURL *string `toml:"agent_api_url"`
BackendAPIURL *string `toml:"backend_api_url"`
Entity *SensuEntity `toml:"entity"`
Tags map[string]string `toml:"tags"`
Metrics *SensuMetrics `toml:"metrics"`
Check *SensuCheck `toml:"check"`
Timeout config.Duration `toml:"timeout"`
ContentEncoding string `toml:"content_encoding"`
EndpointURL string
OutEntity *OutputEntity
Log telegraf.Logger `toml:"-"`
tls.ClientConfig
client *http.Client
}
func (s *Sensu) createClient() (*http.Client, error) {
tlsCfg, err := s.ClientConfig.TLSConfig()
if err != nil {
return nil, err
}
client := &http.Client{
Transport: &http.Transport{
TLSClientConfig: tlsCfg,
},
Timeout: time.Duration(s.Timeout),
}
return client, nil
}
func (*Sensu) SampleConfig() string {
return sampleConfig
}
func (s *Sensu) Connect() error {
err := s.setEndpointURL()
if err != nil {
return err
}
err = s.setEntity()
if err != nil {
return err
}
client, err := s.createClient()
if err != nil {
return err
}
s.client = client
return nil
}
func (s *Sensu) Close() error {
s.client.CloseIdleConnections()
return nil
}
func (s *Sensu) Write(metrics []telegraf.Metric) error {
var points []*OutputMetric
for _, metric := range metrics {
// Add tags from config to each metric point
tagList := make([]*OutputTag, 0, len(s.Tags)+len(metric.TagList()))
for name, value := range s.Tags {
tag := &OutputTag{
Name: name,
Value: value,
}
tagList = append(tagList, tag)
}
for _, tagSet := range metric.TagList() {
tag := &OutputTag{
Name: tagSet.Key,
Value: tagSet.Value,
}
tagList = append(tagList, tag)
}
// Get all valid numeric values, convert to float64
for _, fieldSet := range metric.FieldList() {
key := fieldSet.Key
value := getFloat(fieldSet.Value)
// JSON does not support these special values
if math.IsInf(value, 1) {
s.Log.Debugf("metric %s returned positive infinity, setting value to %f", key, math.MaxFloat64)
value = math.MaxFloat64
}
if math.IsInf(value, -1) {
s.Log.Debugf("metric %s returned negative infinity, setting value to %f", key, -math.MaxFloat64)
value = -math.MaxFloat64
}
if math.IsNaN(value) {
s.Log.Debugf("metric %s returned as non a number, skipping", key)
continue
}
point := &OutputMetric{
Name: metric.Name() + "." + key,
Tags: tagList,
Timestamp: metric.Time().Unix(),
Value: value,
}
points = append(points, point)
}
}
reqBody, err := s.encodeToJSON(points)
if err != nil {
return err
}
return s.writeMetrics(reqBody)
}
func (s *Sensu) writeMetrics(reqBody []byte) error {
var reqBodyBuffer io.Reader = bytes.NewBuffer(reqBody)
method := http.MethodPost
if s.ContentEncoding == "gzip" {
rc := internal.CompressWithGzip(reqBodyBuffer)
defer rc.Close()
reqBodyBuffer = rc
}
req, err := http.NewRequest(method, s.EndpointURL, reqBodyBuffer)
if err != nil {
return err
}
req.Header.Set("User-Agent", internal.ProductToken())
req.Header.Set("Content-Type", defaultContentType)
if s.ContentEncoding == "gzip" {
req.Header.Set("Content-Encoding", "gzip")
}
if s.APIKey != nil {
req.Header.Set("Authorization", "Key "+*s.APIKey)
}
resp, err := s.client.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusCreated {
bodyData, err := io.ReadAll(resp.Body)
if err != nil {
s.Log.Debugf("Couldn't read response body: %v", err)
}
s.Log.Debugf("Failed to write, response: %v", string(bodyData))
if resp.StatusCode < 400 || resp.StatusCode > 499 {
return fmt.Errorf("when writing to [%s] received status code: %d", s.EndpointURL, resp.StatusCode)
}
}
return nil
}
// Resolves the event write endpoint
func (s *Sensu) setEndpointURL() error {
var (
endpointURL string
pathSuffix string
)
if s.BackendAPIURL != nil {
endpointURL = *s.BackendAPIURL
namespace := "default"
if s.Entity != nil && s.Entity.Namespace != nil {
namespace = *s.Entity.Namespace
}
pathSuffix = "/api/core/v2/namespaces/" + namespace + "/events"
} else if s.AgentAPIURL != nil {
endpointURL = *s.AgentAPIURL
pathSuffix = "/events"
}
if len(endpointURL) == 0 {
s.Log.Debugf("no backend or agent API URL provided, falling back to default agent API URL %s", defaultURL)
endpointURL = defaultURL
pathSuffix = "/events"
}
u, err := url.Parse(endpointURL)
if err != nil {
return err
}
u.Path = path.Join(u.Path, pathSuffix)
s.EndpointURL = u.String()
return nil
}
func (s *Sensu) Init() error {
if len(s.ContentEncoding) != 0 {
validEncoding := []string{"identity", "gzip"}
if !choice.Contains(s.ContentEncoding, validEncoding) {
return fmt.Errorf("unsupported content_encoding [%q] specified", s.ContentEncoding)
}
}
if s.BackendAPIURL != nil && s.APIKey == nil {
return fmt.Errorf("backend_api_url [%q] specified, but no API Key provided", *s.BackendAPIURL)
}
return nil
}
func init() {
outputs.Add("sensu", func() telegraf.Output {
// Default configuration values
// make a string from the defaultURL const
agentAPIURL := defaultURL
return &Sensu{
AgentAPIURL: &agentAPIURL,
Timeout: config.Duration(defaultClientTimeout),
ContentEncoding: "identity",
}
})
}
func (s *Sensu) encodeToJSON(metricPoints []*OutputMetric) ([]byte, error) {
timestamp := time.Now().Unix()
check, err := s.getCheck(metricPoints)
if err != nil {
return []byte{}, err
}
output, err := json.Marshal(&OutputEvent{
Entity: s.OutEntity,
Check: check,
Metrics: &OutputMetrics{
Handlers: s.getHandlers(),
Metrics: metricPoints,
},
Timestamp: timestamp,
})
return output, err
}
// Constructs the entity payload
// Throws when no entity name is provided and fails resolve to hostname
func (s *Sensu) setEntity() error {
if s.BackendAPIURL != nil {
var entityName string
if s.Entity != nil && s.Entity.Name != nil {
entityName = *s.Entity.Name
} else {
defaultHostname, err := os.Hostname()
if err != nil {
return fmt.Errorf("resolving hostname failed: %w", err)
}
entityName = defaultHostname
}
s.OutEntity = &OutputEntity{
Metadata: &OutputMetadata{
Name: entityName,
},
}
return nil
}
s.OutEntity = &OutputEntity{}
return nil
}
// Constructs the check payload
// Throws if check name is not provided
func (s *Sensu) getCheck(metricPoints []*OutputMetric) (*OutputCheck, error) {
count := len(metricPoints)
if s.Check == nil || s.Check.Name == nil {
return &OutputCheck{}, fmt.Errorf("missing check name")
}
return &OutputCheck{
Metadata: &OutputMetadata{
Name: *s.Check.Name,
},
Status: 0, // Always OK
Issued: time.Now().Unix(),
Output: "Telegraf agent processed " + strconv.Itoa(count) + " metrics",
OutputMetricHandlers: s.getHandlers(),
}, nil
}
func (s *Sensu) getHandlers() []string {
if s.Metrics == nil || s.Metrics.Handlers == nil {
return []string{}
}
return s.Metrics.Handlers
}
func getFloat(unk interface{}) float64 {
switch i := unk.(type) {
case float64:
return i
case float32:
return float64(i)
case int64:
return float64(i)
case int32:
return float64(i)
case int:
return float64(i)
case uint64:
return float64(i)
case uint32:
return float64(i)
case uint:
return float64(i)
default:
return math.NaN()
}
}