-
Notifications
You must be signed in to change notification settings - Fork 1.2k
/
scraper.go
393 lines (352 loc) · 13.5 KB
/
scraper.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
package promscrape
import (
"bytes"
"flag"
"fmt"
"sync"
"sync/atomic"
"time"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/procutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/consul"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/digitalocean"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/dns"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/docker"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/dockerswarm"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/ec2"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/eureka"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/gce"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/http"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/kubernetes"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/openstack"
"github.com/VictoriaMetrics/metrics"
)
var (
configCheckInterval = flag.Duration("promscrape.configCheckInterval", 0, "Interval for checking for changes in '-promscrape.config' file. "+
"By default the checking is disabled. Send SIGHUP signal in order to force config check for changes")
suppressDuplicateScrapeTargetErrors = flag.Bool("promscrape.suppressDuplicateScrapeTargetErrors", false, "Whether to suppress 'duplicate scrape target' errors; "+
"see https://docs.victoriametrics.com/vmagent.html#troubleshooting for details")
promscrapeConfigFile = flag.String("promscrape.config", "", "Optional path to Prometheus config file with 'scrape_configs' section containing targets to scrape. "+
"See https://docs.victoriametrics.com/#how-to-scrape-prometheus-exporters-such-as-node-exporter for details")
fileSDCheckInterval = flag.Duration("promscrape.fileSDCheckInterval", 30*time.Second, "Interval for checking for changes in 'file_sd_config'. "+
"See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#file_sd_config for details")
)
// CheckConfig checks -promscrape.config for errors and unsupported options.
func CheckConfig() error {
if *promscrapeConfigFile == "" {
return fmt.Errorf("missing -promscrape.config option")
}
_, _, err := loadConfig(*promscrapeConfigFile)
return err
}
// Init initializes Prometheus scraper with config from the `-promscrape.config`.
//
// Scraped data is passed to pushData.
func Init(pushData func(wr *prompbmarshal.WriteRequest)) {
globalStopCh = make(chan struct{})
scraperWG.Add(1)
go func() {
defer scraperWG.Done()
runScraper(*promscrapeConfigFile, pushData, globalStopCh)
}()
}
// Stop stops Prometheus scraper.
func Stop() {
close(globalStopCh)
scraperWG.Wait()
}
var (
globalStopCh chan struct{}
scraperWG sync.WaitGroup
// PendingScrapeConfigs - zero value means, that
// all scrapeConfigs are inited and ready for work.
PendingScrapeConfigs int32
)
func runScraper(configFile string, pushData func(wr *prompbmarshal.WriteRequest), globalStopCh <-chan struct{}) {
if configFile == "" {
// Nothing to scrape.
return
}
// Register SIGHUP handler for config reload before loadConfig.
// This guarantees that the config will be re-read if the signal arrives just after loadConfig.
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1240
sighupCh := procutil.NewSighupChan()
logger.Infof("reading Prometheus configs from %q", configFile)
cfg, data, err := loadConfig(configFile)
if err != nil {
logger.Fatalf("cannot read %q: %s", configFile, err)
}
cfg.mustStart()
scs := newScrapeConfigs(pushData)
scs.add("consul_sd_configs", *consul.SDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getConsulSDScrapeWork(swsPrev) })
scs.add("digitalocean_sd_configs", *digitalocean.SDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getDigitalOceanDScrapeWork(swsPrev) })
scs.add("dns_sd_configs", *dns.SDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getDNSSDScrapeWork(swsPrev) })
scs.add("docker_sd_configs", *docker.SDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getDockerSDScrapeWork(swsPrev) })
scs.add("dockerswarm_sd_configs", *dockerswarm.SDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getDockerSwarmSDScrapeWork(swsPrev) })
scs.add("ec2_sd_configs", *ec2.SDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getEC2SDScrapeWork(swsPrev) })
scs.add("eureka_sd_configs", *eureka.SDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getEurekaSDScrapeWork(swsPrev) })
scs.add("file_sd_configs", *fileSDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getFileSDScrapeWork(swsPrev) })
scs.add("gce_sd_configs", *gce.SDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getGCESDScrapeWork(swsPrev) })
scs.add("http_sd_configs", *http.SDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getHTTPDScrapeWork(swsPrev) })
scs.add("kubernetes_sd_configs", *kubernetes.SDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getKubernetesSDScrapeWork(swsPrev) })
scs.add("openstack_sd_configs", *openstack.SDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getOpenStackSDScrapeWork(swsPrev) })
scs.add("static_configs", 0, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getStaticScrapeWork() })
var tickerCh <-chan time.Time
if *configCheckInterval > 0 {
ticker := time.NewTicker(*configCheckInterval)
tickerCh = ticker.C
defer ticker.Stop()
}
for {
scs.updateConfig(cfg)
waitForChans:
select {
case <-sighupCh:
logger.Infof("SIGHUP received; reloading Prometheus configs from %q", configFile)
cfgNew, dataNew, err := loadConfig(configFile)
if err != nil {
logger.Errorf("cannot read %q on SIGHUP: %s; continuing with the previous config", configFile, err)
goto waitForChans
}
if bytes.Equal(data, dataNew) {
logger.Infof("nothing changed in %q", configFile)
goto waitForChans
}
cfg.mustStop()
cfgNew.mustStart()
cfg = cfgNew
data = dataNew
case <-tickerCh:
cfgNew, dataNew, err := loadConfig(configFile)
if err != nil {
logger.Errorf("cannot read %q: %s; continuing with the previous config", configFile, err)
goto waitForChans
}
if bytes.Equal(data, dataNew) {
// Nothing changed since the previous loadConfig
goto waitForChans
}
cfg.mustStop()
cfgNew.mustStart()
cfg = cfgNew
data = dataNew
case <-globalStopCh:
cfg.mustStop()
logger.Infof("stopping Prometheus scrapers")
startTime := time.Now()
scs.stop()
logger.Infof("stopped Prometheus scrapers in %.3f seconds", time.Since(startTime).Seconds())
return
}
logger.Infof("found changes in %q; applying these changes", configFile)
configReloads.Inc()
}
}
var configReloads = metrics.NewCounter(`vm_promscrape_config_reloads_total`)
type scrapeConfigs struct {
pushData func(wr *prompbmarshal.WriteRequest)
wg sync.WaitGroup
stopCh chan struct{}
scfgs []*scrapeConfig
}
func newScrapeConfigs(pushData func(wr *prompbmarshal.WriteRequest)) *scrapeConfigs {
return &scrapeConfigs{
pushData: pushData,
stopCh: make(chan struct{}),
}
}
func (scs *scrapeConfigs) add(name string, checkInterval time.Duration, getScrapeWork func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork) {
atomic.AddInt32(&PendingScrapeConfigs, 1)
scfg := &scrapeConfig{
name: name,
pushData: scs.pushData,
getScrapeWork: getScrapeWork,
checkInterval: checkInterval,
cfgCh: make(chan *Config, 1),
stopCh: scs.stopCh,
discoveryDuration: metrics.GetOrCreateHistogram(fmt.Sprintf("vm_promscrape_service_discovery_duration_seconds{type=%q}", name)),
}
scs.wg.Add(1)
go func() {
defer scs.wg.Done()
scfg.run()
}()
scs.scfgs = append(scs.scfgs, scfg)
}
func (scs *scrapeConfigs) updateConfig(cfg *Config) {
for _, scfg := range scs.scfgs {
scfg.cfgCh <- cfg
}
}
func (scs *scrapeConfigs) stop() {
close(scs.stopCh)
scs.wg.Wait()
scs.scfgs = nil
}
type scrapeConfig struct {
name string
pushData func(wr *prompbmarshal.WriteRequest)
getScrapeWork func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork
checkInterval time.Duration
cfgCh chan *Config
stopCh <-chan struct{}
discoveryDuration *metrics.Histogram
}
func (scfg *scrapeConfig) run() {
sg := newScraperGroup(scfg.name, scfg.pushData)
defer sg.stop()
var tickerCh <-chan time.Time
if scfg.checkInterval > 0 {
ticker := time.NewTicker(scfg.checkInterval)
defer ticker.Stop()
tickerCh = ticker.C
}
cfg := <-scfg.cfgCh
var swsPrev []*ScrapeWork
updateScrapeWork := func(cfg *Config) {
startTime := time.Now()
sws := scfg.getScrapeWork(cfg, swsPrev)
sg.update(sws)
swsPrev = sws
scfg.discoveryDuration.UpdateDuration(startTime)
}
updateScrapeWork(cfg)
atomic.AddInt32(&PendingScrapeConfigs, -1)
for {
select {
case <-scfg.stopCh:
return
case cfg = <-scfg.cfgCh:
case <-tickerCh:
}
updateScrapeWork(cfg)
}
}
type scraperGroup struct {
name string
wg sync.WaitGroup
mLock sync.Mutex
m map[string]*scraper
pushData func(wr *prompbmarshal.WriteRequest)
changesCount *metrics.Counter
activeScrapers *metrics.Counter
scrapersStarted *metrics.Counter
scrapersStopped *metrics.Counter
}
func newScraperGroup(name string, pushData func(wr *prompbmarshal.WriteRequest)) *scraperGroup {
sg := &scraperGroup{
name: name,
m: make(map[string]*scraper),
pushData: pushData,
changesCount: metrics.NewCounter(fmt.Sprintf(`vm_promscrape_config_changes_total{type=%q}`, name)),
activeScrapers: metrics.NewCounter(fmt.Sprintf(`vm_promscrape_active_scrapers{type=%q}`, name)),
scrapersStarted: metrics.NewCounter(fmt.Sprintf(`vm_promscrape_scrapers_started_total{type=%q}`, name)),
scrapersStopped: metrics.NewCounter(fmt.Sprintf(`vm_promscrape_scrapers_stopped_total{type=%q}`, name)),
}
metrics.NewGauge(fmt.Sprintf(`vm_promscrape_targets{type=%q, status="up"}`, name), func() float64 {
return float64(tsmGlobal.StatusByGroup(sg.name, true))
})
metrics.NewGauge(fmt.Sprintf(`vm_promscrape_targets{type=%q, status="down"}`, name), func() float64 {
return float64(tsmGlobal.StatusByGroup(sg.name, false))
})
return sg
}
func (sg *scraperGroup) stop() {
sg.mLock.Lock()
for _, sc := range sg.m {
close(sc.stopCh)
}
sg.m = nil
sg.mLock.Unlock()
sg.wg.Wait()
}
func (sg *scraperGroup) update(sws []*ScrapeWork) {
sg.mLock.Lock()
defer sg.mLock.Unlock()
additionsCount := 0
deletionsCount := 0
swsMap := make(map[string][]prompbmarshal.Label, len(sws))
var swsToStart []*ScrapeWork
for _, sw := range sws {
key := sw.key()
originalLabels := swsMap[key]
if originalLabels != nil {
if !*suppressDuplicateScrapeTargetErrors {
logger.Errorf("skipping duplicate scrape target with identical labels; endpoint=%s, labels=%s; "+
"make sure service discovery and relabeling is set up properly; "+
"see also https://docs.victoriametrics.com/vmagent.html#troubleshooting; "+
"original labels for target1: %s; original labels for target2: %s",
sw.ScrapeURL, sw.LabelsString(), promLabelsString(originalLabels), promLabelsString(sw.OriginalLabels))
}
droppedTargetsMap.Register(sw.OriginalLabels)
continue
}
swsMap[key] = sw.OriginalLabels
if sg.m[key] != nil {
// The scraper for the given key already exists.
continue
}
swsToStart = append(swsToStart, sw)
}
// Stop deleted scrapers before starting new scrapers in order to prevent
// series overlap when old scrape target is substituted by new scrape target.
var stoppedChs []<-chan struct{}
for key, sc := range sg.m {
if _, ok := swsMap[key]; !ok {
close(sc.stopCh)
stoppedChs = append(stoppedChs, sc.stoppedCh)
delete(sg.m, key)
deletionsCount++
}
}
// Wait until all the deleted scrapers are stopped before starting new scrapers.
for _, ch := range stoppedChs {
<-ch
}
// Start new scrapers only after the deleted scrapers are stopped.
for _, sw := range swsToStart {
sc := newScraper(sw, sg.name, sg.pushData)
sg.activeScrapers.Inc()
sg.scrapersStarted.Inc()
sg.wg.Add(1)
tsmGlobal.Register(sw)
go func(sw *ScrapeWork) {
defer func() {
sg.wg.Done()
close(sc.stoppedCh)
}()
sc.sw.run(sc.stopCh)
tsmGlobal.Unregister(sw)
sg.activeScrapers.Dec()
sg.scrapersStopped.Inc()
}(sw)
key := sw.key()
sg.m[key] = sc
additionsCount++
}
if additionsCount > 0 || deletionsCount > 0 {
sg.changesCount.Add(additionsCount + deletionsCount)
logger.Infof("%s: added targets: %d, removed targets: %d; total targets: %d", sg.name, additionsCount, deletionsCount, len(sg.m))
}
}
type scraper struct {
sw scrapeWork
// stopCh is unblocked when the given scraper must be stopped.
stopCh chan struct{}
// stoppedCh is unblocked when the given scraper is stopped.
stoppedCh chan struct{}
}
func newScraper(sw *ScrapeWork, group string, pushData func(wr *prompbmarshal.WriteRequest)) *scraper {
sc := &scraper{
stopCh: make(chan struct{}),
stoppedCh: make(chan struct{}),
}
c := newClient(sw)
sc.sw.Config = sw
sc.sw.ScrapeGroup = group
sc.sw.ReadData = c.ReadData
sc.sw.GetStreamReader = c.GetStreamReader
sc.sw.PushData = pushData
return sc
}