-
Notifications
You must be signed in to change notification settings - Fork 2k
/
rule.go
778 lines (681 loc) · 23.8 KB
/
rule.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
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
package main
import (
"context"
"fmt"
"math/rand"
"net"
"net/http"
"net/url"
"os"
"os/signal"
"path"
"path/filepath"
"strconv"
"strings"
"sync"
"syscall"
"time"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/improbable-eng/thanos/pkg/alert"
"github.com/improbable-eng/thanos/pkg/block/metadata"
"github.com/improbable-eng/thanos/pkg/component"
"github.com/improbable-eng/thanos/pkg/discovery/cache"
"github.com/improbable-eng/thanos/pkg/discovery/dns"
"github.com/improbable-eng/thanos/pkg/extprom"
extpromhttp "github.com/improbable-eng/thanos/pkg/extprom/http"
"github.com/improbable-eng/thanos/pkg/objstore/client"
"github.com/improbable-eng/thanos/pkg/promclient"
thanosrule "github.com/improbable-eng/thanos/pkg/rule"
v1 "github.com/improbable-eng/thanos/pkg/rule/api"
"github.com/improbable-eng/thanos/pkg/runutil"
"github.com/improbable-eng/thanos/pkg/shipper"
"github.com/improbable-eng/thanos/pkg/store"
"github.com/improbable-eng/thanos/pkg/store/storepb"
"github.com/improbable-eng/thanos/pkg/tracing"
"github.com/improbable-eng/thanos/pkg/ui"
"github.com/oklog/run"
opentracing "github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
"github.com/prometheus/common/route"
"github.com/prometheus/prometheus/discovery/file"
"github.com/prometheus/prometheus/discovery/targetgroup"
promlabels "github.com/prometheus/prometheus/pkg/labels"
"github.com/prometheus/prometheus/promql"
"github.com/prometheus/prometheus/rules"
"github.com/prometheus/prometheus/storage/tsdb"
"github.com/prometheus/prometheus/util/strutil"
"github.com/prometheus/tsdb/labels"
"google.golang.org/grpc"
kingpin "gopkg.in/alecthomas/kingpin.v2"
)
// registerRule registers a rule command.
func registerRule(m map[string]setupFunc, app *kingpin.Application, name string) {
cmd := app.Command(name, "ruler evaluating Prometheus rules against given Query nodes, exposing Store API and storing old blocks in bucket")
grpcBindAddr, httpBindAddr, cert, key, clientCA := regCommonServerFlags(cmd)
labelStrs := cmd.Flag("label", "Labels to be applied to all generated metrics (repeated). Similar to external labels for Prometheus, used to identify ruler and its blocks as unique source.").
PlaceHolder("<name>=\"<value>\"").Strings()
dataDir := cmd.Flag("data-dir", "data directory").Default("data/").String()
ruleFiles := cmd.Flag("rule-file", "Rule files that should be used by rule manager. Can be in glob format (repeated).").
Default("rules/").Strings()
evalInterval := modelDuration(cmd.Flag("eval-interval", "The default evaluation interval to use.").
Default("30s"))
tsdbBlockDuration := modelDuration(cmd.Flag("tsdb.block-duration", "Block duration for TSDB block.").
Default("2h"))
tsdbRetention := modelDuration(cmd.Flag("tsdb.retention", "Block retention time on local disk.").
Default("48h"))
alertmgrs := cmd.Flag("alertmanagers.url", "Alertmanager replica URLs to push firing alerts. Ruler claims success if push to at least one alertmanager from discovered succeeds. The scheme may be prefixed with 'dns+' or 'dnssrv+' to detect Alertmanager IPs through respective DNS lookups. The port defaults to 9093 or the SRV record's value. The URL path is used as a prefix for the regular Alertmanager API path.").
Strings()
alertmgrsTimeout := cmd.Flag("alertmanagers.send-timeout", "Timeout for sending alerts to alertmanager").Default("10s").Duration()
alertQueryURL := cmd.Flag("alert.query-url", "The external Thanos Query URL that would be set in all alerts 'Source' field").String()
alertExcludeLabels := cmd.Flag("alert.label-drop", "Labels by name to drop before sending to alertmanager. This allows alert to be deduplicated on replica label (repeated). Similar Prometheus alert relabelling").
Strings()
webRoutePrefix := cmd.Flag("web.route-prefix", "Prefix for API and UI endpoints. This allows thanos UI to be served on a sub-path. This option is analogous to --web.route-prefix of Promethus.").Default("").String()
webExternalPrefix := cmd.Flag("web.external-prefix", "Static prefix for all HTML links and redirect URLs in the UI query web interface. Actual endpoints are still served on / or the web.route-prefix. This allows thanos UI to be served behind a reverse proxy that strips a URL sub-path.").Default("").String()
webPrefixHeaderName := cmd.Flag("web.prefix-header", "Name of HTTP request header used for dynamic prefixing of UI links and redirects. This option is ignored if web.external-prefix argument is set. Security risk: enable this option only if a reverse proxy in front of thanos is resetting the header. The --web.prefix-header=X-Forwarded-Prefix option can be useful, for example, if Thanos UI is served via Traefik reverse proxy with PathPrefixStrip option enabled, which sends the stripped prefix value in X-Forwarded-Prefix header. This allows thanos UI to be served on a sub-path.").Default("").String()
objStoreConfig := regCommonObjStoreFlags(cmd, "", false)
queries := cmd.Flag("query", "Addresses of statically configured query API servers (repeatable). The scheme may be prefixed with 'dns+' or 'dnssrv+' to detect query API servers through respective DNS lookups.").
PlaceHolder("<query>").Strings()
fileSDFiles := cmd.Flag("query.sd-files", "Path to file that contain addresses of query peers. The path can be a glob pattern (repeatable).").
PlaceHolder("<path>").Strings()
fileSDInterval := modelDuration(cmd.Flag("query.sd-interval", "Refresh interval to re-read file SD files. (used as a fallback)").
Default("5m"))
dnsSDInterval := modelDuration(cmd.Flag("query.sd-dns-interval", "Interval between DNS resolutions.").
Default("30s"))
dnsSDResolver := cmd.Flag("query.sd-dns-resolver", "Resolver to use. Possible options: [golang, miekgdns]").
Default("golang").Hidden().String()
m[name] = func(g *run.Group, logger log.Logger, reg *prometheus.Registry, tracer opentracing.Tracer, _ bool) error {
lset, err := parseFlagLabels(*labelStrs)
if err != nil {
return errors.Wrap(err, "parse labels")
}
alertQueryURL, err := url.Parse(*alertQueryURL)
if err != nil {
return errors.Wrap(err, "parse alert query url")
}
tsdbOpts := &tsdb.Options{
MinBlockDuration: *tsdbBlockDuration,
MaxBlockDuration: *tsdbBlockDuration,
RetentionDuration: *tsdbRetention,
NoLockfile: true,
}
lookupQueries := map[string]struct{}{}
for _, q := range *queries {
if _, ok := lookupQueries[q]; ok {
return errors.Errorf("Address %s is duplicated for --query flag.", q)
}
lookupQueries[q] = struct{}{}
}
var fileSD *file.Discovery
if len(*fileSDFiles) > 0 {
conf := &file.SDConfig{
Files: *fileSDFiles,
RefreshInterval: *fileSDInterval,
}
fileSD = file.NewDiscovery(conf, logger)
}
if fileSD == nil && len(*queries) == 0 {
return errors.Errorf("No --query parameter was given.")
}
return runRule(g,
logger,
reg,
tracer,
lset,
*alertmgrs,
*alertmgrsTimeout,
*grpcBindAddr,
*cert,
*key,
*clientCA,
*httpBindAddr,
*webRoutePrefix,
*webExternalPrefix,
*webPrefixHeaderName,
time.Duration(*evalInterval),
*dataDir,
*ruleFiles,
objStoreConfig,
tsdbOpts,
alertQueryURL,
*alertExcludeLabels,
*queries,
fileSD,
time.Duration(*dnsSDInterval),
*dnsSDResolver,
)
}
}
// runRule runs a rule evaluation component that continuously evaluates alerting and recording
// rules. It sends alert notifications and writes TSDB data for results like a regular Prometheus server.
func runRule(
g *run.Group,
logger log.Logger,
reg *prometheus.Registry,
tracer opentracing.Tracer,
lset labels.Labels,
alertmgrURLs []string,
alertmgrsTimeout time.Duration,
grpcBindAddr string,
cert string,
key string,
clientCA string,
httpBindAddr string,
webRoutePrefix string,
webExternalPrefix string,
webPrefixHeaderName string,
evalInterval time.Duration,
dataDir string,
ruleFiles []string,
objStoreConfig *pathOrContent,
tsdbOpts *tsdb.Options,
alertQueryURL *url.URL,
alertExcludeLabels []string,
queryAddrs []string,
fileSD *file.Discovery,
dnsSDInterval time.Duration,
dnsSDResolver string,
) error {
configSuccess := prometheus.NewGauge(prometheus.GaugeOpts{
Name: "thanos_rule_config_last_reload_successful",
Help: "Whether the last configuration reload attempt was successful.",
})
configSuccessTime := prometheus.NewGauge(prometheus.GaugeOpts{
Name: "thanos_rule_config_last_reload_success_timestamp_seconds",
Help: "Timestamp of the last successful configuration reload.",
})
duplicatedQuery := prometheus.NewCounter(prometheus.CounterOpts{
Name: "thanos_rule_duplicated_query_address",
Help: "The number of times a duplicated query addresses is detected from the different configs in rule",
})
alertMngrAddrResolutionErrors := prometheus.NewCounter(prometheus.CounterOpts{
Name: "thanos_rule_alertmanager_address_resolution_errors",
Help: "The number of times resolving an address of an alertmanager has failed inside Thanos Rule",
})
rulesLoaded := prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Name: "thanos_rule_loaded_rules",
Help: "Loaded rules partitioned by file and group",
},
[]string{"strategy", "file", "group"},
)
ruleEvalWarnings := prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "thanos_rule_evaluation_with_warnings_total",
Help: "The total number of rule evaluation that were successful but had warnings which can indicate partial error.",
}, []string{"strategy"},
)
ruleEvalWarnings.WithLabelValues(strings.ToLower(storepb.PartialResponseStrategy_ABORT.String()))
ruleEvalWarnings.WithLabelValues(strings.ToLower(storepb.PartialResponseStrategy_WARN.String()))
reg.MustRegister(configSuccess)
reg.MustRegister(configSuccessTime)
reg.MustRegister(duplicatedQuery)
reg.MustRegister(alertMngrAddrResolutionErrors)
reg.MustRegister(rulesLoaded)
reg.MustRegister(ruleEvalWarnings)
for _, addr := range queryAddrs {
if addr == "" {
return errors.New("static querier address cannot be empty")
}
}
db, err := tsdb.Open(dataDir, log.With(logger, "component", "tsdb"), reg, tsdbOpts)
if err != nil {
return errors.Wrap(err, "open TSDB")
}
{
done := make(chan struct{})
g.Add(func() error {
<-done
return db.Close()
}, func(error) {
close(done)
})
}
// FileSD query addresses.
fileSDCache := cache.New()
dnsProvider := dns.NewProvider(
logger,
extprom.WrapRegistererWithPrefix("thanos_ruler_query_apis_", reg),
dns.ResolverType(dnsSDResolver),
)
// Run rule evaluation and alert notifications.
var (
alertmgrs = newAlertmanagerSet(logger, alertmgrURLs, dns.ResolverType(dnsSDResolver))
alertQ = alert.NewQueue(logger, reg, 10000, 100, labelsTSDBToProm(lset), alertExcludeLabels)
ruleMgrs = thanosrule.Managers{}
)
{
notify := func(ctx context.Context, expr string, alerts ...*rules.Alert) {
res := make([]*alert.Alert, 0, len(alerts))
for _, alrt := range alerts {
// Only send actually firing alerts.
if alrt.State == rules.StatePending {
continue
}
a := &alert.Alert{
StartsAt: alrt.FiredAt,
Labels: alrt.Labels,
Annotations: alrt.Annotations,
GeneratorURL: alertQueryURL.String() + strutil.TableLinkForExpression(expr),
}
if !alrt.ResolvedAt.IsZero() {
a.EndsAt = alrt.ResolvedAt
}
res = append(res, a)
}
alertQ.Push(res)
}
st := tsdb.Adapter(db, 0)
opts := rules.ManagerOptions{
NotifyFunc: notify,
Logger: log.With(logger, "component", "rules"),
Appendable: st,
ExternalURL: nil,
TSDB: st,
}
for _, strategy := range storepb.PartialResponseStrategy_value {
s := storepb.PartialResponseStrategy(strategy)
ctx, cancel := context.WithCancel(context.Background())
ctx = tracing.ContextWithTracer(ctx, tracer)
opts := opts
opts.Registerer = extprom.WrapRegistererWith(prometheus.Labels{"strategy": strings.ToLower(s.String())}, reg)
opts.Context = ctx
opts.QueryFunc = queryFunc(logger, dnsProvider, duplicatedQuery, ruleEvalWarnings, s)
ruleMgrs[s] = rules.NewManager(&opts)
g.Add(func() error {
ruleMgrs[s].Run()
<-ctx.Done()
return nil
}, func(error) {
cancel()
ruleMgrs[s].Stop()
})
}
}
{
// TODO(bwplotka): https://github.com/improbable-eng/thanos/issues/660
sdr := alert.NewSender(logger, reg, alertmgrs.get, nil, alertmgrsTimeout)
ctx, cancel := context.WithCancel(context.Background())
g.Add(func() error {
for {
sdr.Send(ctx, alertQ.Pop(ctx.Done()))
select {
case <-ctx.Done():
return ctx.Err()
default:
}
}
}, func(error) {
cancel()
})
}
{
ctx, cancel := context.WithCancel(context.Background())
g.Add(func() error {
return runutil.Repeat(30*time.Second, ctx.Done(), func() error {
if err := alertmgrs.update(ctx); err != nil {
level.Error(logger).Log("msg", "refreshing alertmanagers failed", "err", err)
alertMngrAddrResolutionErrors.Inc()
}
return nil
})
}, func(error) {
cancel()
})
}
// Run File Service Discovery and update the query addresses when the files are modified
if fileSD != nil {
var fileSDUpdates chan []*targetgroup.Group
ctxRun, cancelRun := context.WithCancel(context.Background())
fileSDUpdates = make(chan []*targetgroup.Group)
g.Add(func() error {
fileSD.Run(ctxRun, fileSDUpdates)
return nil
}, func(error) {
cancelRun()
})
ctxUpdate, cancelUpdate := context.WithCancel(context.Background())
g.Add(func() error {
for {
select {
case update := <-fileSDUpdates:
// Discoverers sometimes send nil updates so need to check for it to avoid panics
if update == nil {
continue
}
fileSDCache.Update(update)
case <-ctxUpdate.Done():
return nil
}
}
}, func(error) {
cancelUpdate()
close(fileSDUpdates)
})
}
// Handle reload and termination interrupts.
reload := make(chan struct{}, 1)
{
cancel := make(chan struct{})
reload <- struct{}{} // initial reload
g.Add(func() error {
for {
select {
case <-cancel:
return errors.New("canceled")
case <-reload:
}
level.Debug(logger).Log("msg", "configured rule files", "files", strings.Join(ruleFiles, ","))
var files []string
for _, pat := range ruleFiles {
fs, err := filepath.Glob(pat)
if err != nil {
// The only error can be a bad pattern.
level.Error(logger).Log("msg", "retrieving rule files failed. Ignoring file.", "pattern", pat, "err", err)
continue
}
files = append(files, fs...)
}
level.Info(logger).Log("msg", "reload rule files", "numFiles", len(files))
if err := ruleMgrs.Update(dataDir, evalInterval, files); err != nil {
configSuccess.Set(0)
level.Error(logger).Log("msg", "reloading rules failed", "err", err)
continue
}
configSuccess.Set(1)
configSuccessTime.Set(float64(time.Now().UnixNano()) / 1e9)
rulesLoaded.Reset()
for s, mgr := range ruleMgrs {
for _, group := range mgr.RuleGroups() {
rulesLoaded.WithLabelValues(s.String(), group.File(), group.Name()).Set(float64(len(group.Rules())))
}
}
}
}, func(error) {
close(cancel)
})
}
{
cancel := make(chan struct{})
g.Add(func() error {
c := make(chan os.Signal, 1)
for {
signal.Notify(c, syscall.SIGHUP)
select {
case <-c:
select {
case reload <- struct{}{}:
default:
}
case <-cancel:
return errors.New("canceled")
}
}
}, func(error) {
close(cancel)
})
}
// Periodically update the addresses from static flags and file SD by resolving them using DNS SD if necessary.
{
ctx, cancel := context.WithCancel(context.Background())
g.Add(func() error {
return runutil.Repeat(dnsSDInterval, ctx.Done(), func() error {
dnsProvider.Resolve(ctx, append(fileSDCache.Addresses(), queryAddrs...))
return nil
})
}, func(error) {
cancel()
})
}
// Start gRPC server.
{
l, err := net.Listen("tcp", grpcBindAddr)
if err != nil {
return errors.Wrap(err, "listen API address")
}
logger := log.With(logger, "component", component.Rule.String())
store := store.NewTSDBStore(logger, reg, db, component.Rule, lset)
opts, err := defaultGRPCServerOpts(logger, reg, tracer, cert, key, clientCA)
if err != nil {
return errors.Wrap(err, "setup gRPC options")
}
s := grpc.NewServer(opts...)
storepb.RegisterStoreServer(s, store)
g.Add(func() error {
return errors.Wrap(s.Serve(l), "serve gRPC")
}, func(error) {
s.Stop()
})
}
// Start UI & metrics HTTP server.
{
router := route.New()
// redirect from / to /webRoutePrefix
if webRoutePrefix != "" {
router.Get("/", func(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, webRoutePrefix, http.StatusFound)
})
}
router.WithPrefix(webRoutePrefix).Post("/-/reload", func(w http.ResponseWriter, r *http.Request) {
reload <- struct{}{}
})
flagsMap := map[string]string{
// TODO(bplotka in PR #513 review): pass all flags, not only the flags needed by prefix rewriting.
"web.external-prefix": webExternalPrefix,
"web.prefix-header": webPrefixHeaderName,
}
ins := extpromhttp.NewInstrumentationMiddleware(reg)
ui.NewRuleUI(logger, ruleMgrs, alertQueryURL.String(), flagsMap).Register(router.WithPrefix(webRoutePrefix), ins)
api := v1.NewAPI(logger, ruleMgrs)
api.Register(router.WithPrefix(path.Join(webRoutePrefix, "/api/v1")), tracer, logger, ins)
mux := http.NewServeMux()
registerMetrics(mux, reg)
registerProfile(mux)
mux.Handle("/", router)
l, err := net.Listen("tcp", httpBindAddr)
if err != nil {
return errors.Wrapf(err, "listen HTTP on address %s", httpBindAddr)
}
g.Add(func() error {
level.Info(logger).Log("msg", "Listening for ui requests", "address", httpBindAddr)
return errors.Wrap(http.Serve(l, mux), "serve query")
}, func(error) {
runutil.CloseWithLogOnErr(logger, l, "query and metric listener")
})
}
confContentYaml, err := objStoreConfig.Content()
if err != nil {
return err
}
uploads := true
if len(confContentYaml) == 0 {
level.Info(logger).Log("msg", "No supported bucket was configured, uploads will be disabled")
uploads = false
}
if uploads {
// The background shipper continuously scans the data directory and uploads
// new blocks to Google Cloud Storage or an S3-compatible storage service.
bkt, err := client.NewBucket(logger, confContentYaml, reg, component.Rule.String())
if err != nil {
return err
}
// Ensure we close up everything properly.
defer func() {
if err != nil {
runutil.CloseWithLogOnErr(logger, bkt, "bucket client")
}
}()
s := shipper.New(logger, nil, dataDir, bkt, func() labels.Labels { return lset }, metadata.RulerSource)
ctx, cancel := context.WithCancel(context.Background())
g.Add(func() error {
defer runutil.CloseWithLogOnErr(logger, bkt, "bucket client")
return runutil.Repeat(30*time.Second, ctx.Done(), func() error {
if _, err := s.Sync(ctx); err != nil {
level.Warn(logger).Log("err", err)
}
return nil
})
}, func(error) {
cancel()
})
}
level.Info(logger).Log("msg", "starting rule node")
return nil
}
type alertmanagerSet struct {
resolver dns.Resolver
addrs []string
mtx sync.Mutex
current []*url.URL
}
func newAlertmanagerSet(logger log.Logger, addrs []string, dnsSDResolver dns.ResolverType) *alertmanagerSet {
return &alertmanagerSet{
resolver: dns.NewResolver(dnsSDResolver.ToResolver(logger)),
addrs: addrs,
}
}
func (s *alertmanagerSet) get() []*url.URL {
s.mtx.Lock()
defer s.mtx.Unlock()
return s.current
}
const defaultAlertmanagerPort = 9093
func (s *alertmanagerSet) update(ctx context.Context) error {
var result []*url.URL
for _, addr := range s.addrs {
var (
name = addr
qtype dns.QType
resolvedDomain []string
)
if nameQtype := strings.SplitN(addr, "+", 2); len(nameQtype) == 2 {
name, qtype = nameQtype[1], dns.QType(nameQtype[0])
}
u, err := url.Parse(name)
if err != nil {
return errors.Wrapf(err, "parse URL %q", name)
}
// Get only the host and resolve it if needed.
host := u.Host
if qtype != "" {
if qtype == dns.A {
_, _, err = net.SplitHostPort(host)
if err != nil {
// The host could be missing a port. Append the defaultAlertmanagerPort.
host = host + ":" + strconv.Itoa(defaultAlertmanagerPort)
}
}
resolvedDomain, err = s.resolver.Resolve(ctx, host, qtype)
if err != nil {
return errors.Wrap(err, "alertmanager resolve")
}
} else {
resolvedDomain = []string{host}
}
for _, resolved := range resolvedDomain {
result = append(result, &url.URL{
Scheme: u.Scheme,
Host: resolved,
Path: u.Path,
User: u.User,
})
}
}
s.mtx.Lock()
s.current = result
s.mtx.Unlock()
return nil
}
func parseFlagLabels(s []string) (labels.Labels, error) {
var lset labels.Labels
for _, l := range s {
parts := strings.SplitN(l, "=", 2)
if len(parts) != 2 {
return nil, errors.Errorf("unrecognized label %q", l)
}
if !model.LabelName.IsValid(model.LabelName(string(parts[0]))) {
return nil, errors.Errorf("unsupported format for label %s", l)
}
val, err := strconv.Unquote(parts[1])
if err != nil {
return nil, errors.Wrap(err, "unquote label value")
}
lset = append(lset, labels.Label{Name: parts[0], Value: val})
}
return lset, nil
}
func labelsTSDBToProm(lset labels.Labels) (res promlabels.Labels) {
for _, l := range lset {
res = append(res, promlabels.Label{
Name: l.Name,
Value: l.Value,
})
}
return res
}
func removeDuplicateQueryAddrs(logger log.Logger, duplicatedQueriers prometheus.Counter, addrs []string) []string {
set := make(map[string]struct{})
for _, addr := range addrs {
if _, ok := set[addr]; ok {
level.Warn(logger).Log("msg", "Duplicate query address is provided - %v", addr)
duplicatedQueriers.Inc()
}
set[addr] = struct{}{}
}
deduplicated := make([]string, 0, len(set))
for key := range set {
deduplicated = append(deduplicated, key)
}
return deduplicated
}
// queryFunc returns query function that hits the HTTP query API of query peers in randomized order until we get a result
// back or the context get canceled.
func queryFunc(
logger log.Logger,
dnsProvider *dns.Provider,
duplicatedQuery prometheus.Counter,
ruleEvalWarnings *prometheus.CounterVec,
partialResponseStrategy storepb.PartialResponseStrategy,
) rules.QueryFunc {
var spanID string
switch partialResponseStrategy {
case storepb.PartialResponseStrategy_WARN:
spanID = "/rule_instant_query HTTP[client]"
case storepb.PartialResponseStrategy_ABORT:
spanID = "/rule_instant_query_part_resp_abort HTTP[client]"
default:
// Programming error will be caught by tests.
panic(errors.Errorf("unknown partial response strategy %v", partialResponseStrategy).Error())
}
return func(ctx context.Context, q string, t time.Time) (promql.Vector, error) {
// Add DNS resolved addresses from static flags and file SD.
// TODO(bwplotka): Consider generating addresses in *url.URL
addrs := dnsProvider.Addresses()
removeDuplicateQueryAddrs(logger, duplicatedQuery, addrs)
for _, i := range rand.Perm(len(addrs)) {
u, err := url.Parse(fmt.Sprintf("http://%s", addrs[i]))
if err != nil {
return nil, errors.Wrapf(err, "url parse %s", addrs[i])
}
span, ctx := tracing.StartSpan(ctx, spanID)
v, warns, err := promclient.PromqlQueryInstant(ctx, logger, u, q, t, promclient.QueryOptions{
Deduplicate: true,
PartialResponseStrategy: partialResponseStrategy,
})
span.Finish()
if err != nil {
level.Error(logger).Log("err", err, "query", q)
} else {
if len(warns) > 0 {
ruleEvalWarnings.WithLabelValues(strings.ToLower(partialResponseStrategy.String())).Inc()
// TODO(bwplotka): Propagate those to UI, probably requires changing rule manager code ):
level.Warn(logger).Log("warnings", strings.Join(warns, ", "), "query", q)
}
return v, nil
}
}
return nil, errors.Errorf("no query peer reachable")
}
}