-
Notifications
You must be signed in to change notification settings - Fork 8.9k
/
web.go
811 lines (714 loc) · 23 KB
/
web.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
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
// Copyright 2013 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package web
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
stdlog "log"
"math"
"net"
"net/http"
"net/http/pprof"
"net/url"
"os"
"path"
"path/filepath"
"runtime"
"runtime/debug"
"strconv"
"strings"
"sync"
"time"
"github.com/alecthomas/units"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/grafana/regexp"
"github.com/mwitkow/go-conntrack"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
io_prometheus_client "github.com/prometheus/client_model/go"
"github.com/prometheus/common/model"
"github.com/prometheus/common/route"
"github.com/prometheus/common/server"
toolkit_web "github.com/prometheus/exporter-toolkit/web"
"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
"go.uber.org/atomic"
"golang.org/x/net/netutil"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/notifier"
"github.com/prometheus/prometheus/promql"
"github.com/prometheus/prometheus/rules"
"github.com/prometheus/prometheus/scrape"
"github.com/prometheus/prometheus/storage"
"github.com/prometheus/prometheus/template"
"github.com/prometheus/prometheus/util/httputil"
api_v1 "github.com/prometheus/prometheus/web/api/v1"
"github.com/prometheus/prometheus/web/ui"
)
// Paths that are handled by the React / Reach router that should all be served the main React app's index.html.
var reactRouterPaths = []string{
"/config",
"/flags",
"/service-discovery",
"/status",
"/targets",
"/starting",
}
// Paths that are handled by the React router when the Agent mode is set.
var reactRouterAgentPaths = []string{
"/agent",
}
// Paths that are handled by the React router when the Agent mode is not set.
var reactRouterServerPaths = []string{
"/alerts",
"/graph",
"/rules",
"/tsdb-status",
}
// withStackTrace logs the stack trace in case the request panics. The function
// will re-raise the error which will then be handled by the net/http package.
// It is needed because the go-kit log package doesn't manage properly the
// panics from net/http (see https://github.com/go-kit/kit/issues/233).
func withStackTracer(h http.Handler, l log.Logger) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
defer func() {
if err := recover(); err != nil {
const size = 64 << 10
buf := make([]byte, size)
buf = buf[:runtime.Stack(buf, false)]
level.Error(l).Log("msg", "panic while serving request", "client", r.RemoteAddr, "url", r.URL, "err", err, "stack", buf)
panic(err)
}
}()
h.ServeHTTP(w, r)
})
}
type metrics struct {
requestCounter *prometheus.CounterVec
requestDuration *prometheus.HistogramVec
responseSize *prometheus.HistogramVec
readyStatus prometheus.Gauge
}
func newMetrics(r prometheus.Registerer) *metrics {
m := &metrics{
requestCounter: prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "prometheus_http_requests_total",
Help: "Counter of HTTP requests.",
},
[]string{"handler", "code"},
),
requestDuration: prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Name: "prometheus_http_request_duration_seconds",
Help: "Histogram of latencies for HTTP requests.",
Buckets: []float64{.1, .2, .4, 1, 3, 8, 20, 60, 120},
NativeHistogramBucketFactor: 1.1,
NativeHistogramMaxBucketNumber: 100,
NativeHistogramMinResetDuration: 1 * time.Hour,
},
[]string{"handler"},
),
responseSize: prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Name: "prometheus_http_response_size_bytes",
Help: "Histogram of response size for HTTP requests.",
Buckets: prometheus.ExponentialBuckets(100, 10, 8),
},
[]string{"handler"},
),
readyStatus: prometheus.NewGauge(prometheus.GaugeOpts{
Name: "prometheus_ready",
Help: "Whether Prometheus startup was fully completed and the server is ready for normal operation.",
}),
}
if r != nil {
r.MustRegister(m.requestCounter, m.requestDuration, m.responseSize, m.readyStatus)
registerFederationMetrics(r)
}
return m
}
func (m *metrics) instrumentHandlerWithPrefix(prefix string) func(handlerName string, handler http.HandlerFunc) http.HandlerFunc {
return func(handlerName string, handler http.HandlerFunc) http.HandlerFunc {
return m.instrumentHandler(prefix+handlerName, handler)
}
}
func (m *metrics) instrumentHandler(handlerName string, handler http.HandlerFunc) http.HandlerFunc {
m.requestCounter.WithLabelValues(handlerName, "200")
return promhttp.InstrumentHandlerCounter(
m.requestCounter.MustCurryWith(prometheus.Labels{"handler": handlerName}),
promhttp.InstrumentHandlerDuration(
m.requestDuration.MustCurryWith(prometheus.Labels{"handler": handlerName}),
promhttp.InstrumentHandlerResponseSize(
m.responseSize.MustCurryWith(prometheus.Labels{"handler": handlerName}),
handler,
),
),
)
}
// PrometheusVersion contains build information about Prometheus.
type PrometheusVersion = api_v1.PrometheusVersion
type LocalStorage interface {
storage.Storage
api_v1.TSDBAdminStats
}
// Handler serves various HTTP endpoints of the Prometheus server.
type Handler struct {
logger log.Logger
gatherer prometheus.Gatherer
metrics *metrics
scrapeManager *scrape.Manager
ruleManager *rules.Manager
queryEngine *promql.Engine
lookbackDelta time.Duration
context context.Context
storage storage.Storage
localStorage LocalStorage
exemplarStorage storage.ExemplarQueryable
notifier *notifier.Manager
apiV1 *api_v1.API
router *route.Router
quitCh chan struct{}
quitOnce sync.Once
reloadCh chan chan error
options *Options
config *config.Config
versionInfo *PrometheusVersion
birth time.Time
cwd string
flagsMap map[string]string
mtx sync.RWMutex
now func() model.Time
ready atomic.Uint32 // ready is uint32 rather than boolean to be able to use atomic functions.
}
// ApplyConfig updates the config field of the Handler struct.
func (h *Handler) ApplyConfig(conf *config.Config) error {
h.mtx.Lock()
defer h.mtx.Unlock()
h.config = conf
return nil
}
// Options for the web Handler.
type Options struct {
Context context.Context
TSDBRetentionDuration model.Duration
TSDBDir string
TSDBMaxBytes units.Base2Bytes
LocalStorage LocalStorage
Storage storage.Storage
ExemplarStorage storage.ExemplarQueryable
QueryEngine *promql.Engine
LookbackDelta time.Duration
ScrapeManager *scrape.Manager
RuleManager *rules.Manager
Notifier *notifier.Manager
Version *PrometheusVersion
Flags map[string]string
ListenAddress string
CORSOrigin *regexp.Regexp
ReadTimeout time.Duration
MaxConnections int
ExternalURL *url.URL
RoutePrefix string
UseLocalAssets bool
UserAssetsPath string
ConsoleTemplatesPath string
ConsoleLibrariesPath string
EnableLifecycle bool
EnableAdminAPI bool
PageTitle string
RemoteReadSampleLimit int
RemoteReadConcurrencyLimit int
RemoteReadBytesInFrame int
EnableRemoteWriteReceiver bool
EnableOTLPWriteReceiver bool
IsAgent bool
AppName string
Gatherer prometheus.Gatherer
Registerer prometheus.Registerer
}
// New initializes a new web Handler.
func New(logger log.Logger, o *Options) *Handler {
if logger == nil {
logger = log.NewNopLogger()
}
m := newMetrics(o.Registerer)
router := route.New().
WithInstrumentation(m.instrumentHandler).
WithInstrumentation(setPathWithPrefix(""))
cwd, err := os.Getwd()
if err != nil {
cwd = "<error retrieving current working directory>"
}
h := &Handler{
logger: logger,
gatherer: o.Gatherer,
metrics: m,
router: router,
quitCh: make(chan struct{}),
reloadCh: make(chan chan error),
options: o,
versionInfo: o.Version,
birth: time.Now().UTC(),
cwd: cwd,
flagsMap: o.Flags,
context: o.Context,
scrapeManager: o.ScrapeManager,
ruleManager: o.RuleManager,
queryEngine: o.QueryEngine,
lookbackDelta: o.LookbackDelta,
storage: o.Storage,
localStorage: o.LocalStorage,
exemplarStorage: o.ExemplarStorage,
notifier: o.Notifier,
now: model.Now,
}
h.SetReady(false)
factorySPr := func(_ context.Context) api_v1.ScrapePoolsRetriever { return h.scrapeManager }
factoryTr := func(_ context.Context) api_v1.TargetRetriever { return h.scrapeManager }
factoryAr := func(_ context.Context) api_v1.AlertmanagerRetriever { return h.notifier }
FactoryRr := func(_ context.Context) api_v1.RulesRetriever { return h.ruleManager }
var app storage.Appendable
if o.EnableRemoteWriteReceiver || o.EnableOTLPWriteReceiver {
app = h.storage
}
h.apiV1 = api_v1.NewAPI(h.queryEngine, h.storage, app, h.exemplarStorage, factorySPr, factoryTr, factoryAr,
func() config.Config {
h.mtx.RLock()
defer h.mtx.RUnlock()
return *h.config
},
o.Flags,
api_v1.GlobalURLOptions{
ListenAddress: o.ListenAddress,
Host: o.ExternalURL.Host,
Scheme: o.ExternalURL.Scheme,
},
h.testReady,
h.options.LocalStorage,
h.options.TSDBDir,
h.options.EnableAdminAPI,
logger,
FactoryRr,
h.options.RemoteReadSampleLimit,
h.options.RemoteReadConcurrencyLimit,
h.options.RemoteReadBytesInFrame,
h.options.IsAgent,
h.options.CORSOrigin,
h.runtimeInfo,
h.versionInfo,
o.Gatherer,
o.Registerer,
nil,
o.EnableRemoteWriteReceiver,
o.EnableOTLPWriteReceiver,
)
if o.RoutePrefix != "/" {
// If the prefix is missing for the root path, prepend it.
router.Get("/", func(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, o.RoutePrefix, http.StatusFound)
})
router = router.WithPrefix(o.RoutePrefix)
}
homePage := "/graph"
if o.IsAgent {
homePage = "/agent"
}
readyf := h.testReady
router.Get("/", func(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, path.Join(o.ExternalURL.Path, homePage), http.StatusFound)
})
// The console library examples at 'console_libraries/prom.lib' still depend on old asset files being served under `classic`.
router.Get("/classic/static/*filepath", func(w http.ResponseWriter, r *http.Request) {
r.URL.Path = path.Join("/static", route.Param(r.Context(), "filepath"))
fs := server.StaticFileServer(ui.Assets)
fs.ServeHTTP(w, r)
})
router.Get("/version", h.version)
router.Get("/metrics", promhttp.Handler().ServeHTTP)
router.Get("/federate", readyf(httputil.CompressionHandler{
Handler: http.HandlerFunc(h.federation),
}.ServeHTTP))
router.Get("/consoles/*filepath", readyf(h.consoles))
serveReactApp := func(w http.ResponseWriter, r *http.Request) {
f, err := ui.Assets.Open("/static/react/index.html")
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprintf(w, "Error opening React index.html: %v", err)
return
}
defer func() { _ = f.Close() }()
idx, err := io.ReadAll(f)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprintf(w, "Error reading React index.html: %v", err)
return
}
replacedIdx := bytes.ReplaceAll(idx, []byte("CONSOLES_LINK_PLACEHOLDER"), []byte(h.consolesPath()))
replacedIdx = bytes.ReplaceAll(replacedIdx, []byte("TITLE_PLACEHOLDER"), []byte(h.options.PageTitle))
replacedIdx = bytes.ReplaceAll(replacedIdx, []byte("AGENT_MODE_PLACEHOLDER"), []byte(strconv.FormatBool(h.options.IsAgent)))
replacedIdx = bytes.ReplaceAll(replacedIdx, []byte("READY_PLACEHOLDER"), []byte(strconv.FormatBool(h.isReady())))
w.Write(replacedIdx)
}
// Serve the React app.
for _, p := range reactRouterPaths {
router.Get(p, serveReactApp)
}
if h.options.IsAgent {
for _, p := range reactRouterAgentPaths {
router.Get(p, serveReactApp)
}
} else {
for _, p := range reactRouterServerPaths {
router.Get(p, serveReactApp)
}
}
// The favicon and manifest are bundled as part of the React app, but we want to serve
// them on the root.
for _, p := range []string{"/favicon.ico", "/manifest.json"} {
assetPath := "/static/react" + p
router.Get(p, func(w http.ResponseWriter, r *http.Request) {
r.URL.Path = assetPath
fs := server.StaticFileServer(ui.Assets)
fs.ServeHTTP(w, r)
})
}
// Static files required by the React app.
router.Get("/static/*filepath", func(w http.ResponseWriter, r *http.Request) {
r.URL.Path = path.Join("/static/react/static", route.Param(r.Context(), "filepath"))
fs := server.StaticFileServer(ui.Assets)
fs.ServeHTTP(w, r)
})
if o.UserAssetsPath != "" {
router.Get("/user/*filepath", route.FileServe(o.UserAssetsPath))
}
if o.EnableLifecycle {
router.Post("/-/quit", h.quit)
router.Put("/-/quit", h.quit)
router.Post("/-/reload", h.reload)
router.Put("/-/reload", h.reload)
} else {
forbiddenAPINotEnabled := func(w http.ResponseWriter, _ *http.Request) {
w.WriteHeader(http.StatusForbidden)
w.Write([]byte("Lifecycle API is not enabled."))
}
router.Post("/-/quit", forbiddenAPINotEnabled)
router.Put("/-/quit", forbiddenAPINotEnabled)
router.Post("/-/reload", forbiddenAPINotEnabled)
router.Put("/-/reload", forbiddenAPINotEnabled)
}
router.Get("/-/quit", func(w http.ResponseWriter, _ *http.Request) {
w.WriteHeader(http.StatusMethodNotAllowed)
w.Write([]byte("Only POST or PUT requests allowed"))
})
router.Get("/-/reload", func(w http.ResponseWriter, _ *http.Request) {
w.WriteHeader(http.StatusMethodNotAllowed)
w.Write([]byte("Only POST or PUT requests allowed"))
})
router.Get("/debug/*subpath", serveDebug)
router.Post("/debug/*subpath", serveDebug)
router.Get("/-/healthy", func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
fmt.Fprintf(w, o.AppName+" is Healthy.\n")
})
router.Head("/-/healthy", func(w http.ResponseWriter, _ *http.Request) {
w.WriteHeader(http.StatusOK)
})
router.Get("/-/ready", readyf(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
fmt.Fprintf(w, o.AppName+" is Ready.\n")
}))
router.Head("/-/ready", readyf(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
}))
return h
}
func serveDebug(w http.ResponseWriter, req *http.Request) {
ctx := req.Context()
subpath := route.Param(ctx, "subpath")
if subpath == "/pprof" {
http.Redirect(w, req, req.URL.Path+"/", http.StatusMovedPermanently)
return
}
if !strings.HasPrefix(subpath, "/pprof/") {
http.NotFound(w, req)
return
}
subpath = strings.TrimPrefix(subpath, "/pprof/")
switch subpath {
case "cmdline":
pprof.Cmdline(w, req)
case "profile":
pprof.Profile(w, req)
case "symbol":
pprof.Symbol(w, req)
case "trace":
pprof.Trace(w, req)
default:
req.URL.Path = "/debug/pprof/" + subpath
pprof.Index(w, req)
}
}
// SetReady sets the ready status of our web Handler.
func (h *Handler) SetReady(v bool) {
if v {
h.ready.Store(1)
h.metrics.readyStatus.Set(1)
return
}
h.ready.Store(0)
h.metrics.readyStatus.Set(0)
}
// Verifies whether the server is ready or not.
func (h *Handler) isReady() bool {
return h.ready.Load() > 0
}
// Checks if server is ready, calls f if it is, returns 503 if it is not.
func (h *Handler) testReady(f http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if h.isReady() {
f(w, r)
} else {
w.WriteHeader(http.StatusServiceUnavailable)
fmt.Fprintf(w, "Service Unavailable")
}
}
}
// Quit returns the receive-only quit channel.
func (h *Handler) Quit() <-chan struct{} {
return h.quitCh
}
// Reload returns the receive-only channel that signals configuration reload requests.
func (h *Handler) Reload() <-chan chan error {
return h.reloadCh
}
// Listener creates the TCP listener for web requests.
func (h *Handler) Listener() (net.Listener, error) {
level.Info(h.logger).Log("msg", "Start listening for connections", "address", h.options.ListenAddress)
listener, err := net.Listen("tcp", h.options.ListenAddress)
if err != nil {
return listener, err
}
listener = netutil.LimitListener(listener, h.options.MaxConnections)
// Monitor incoming connections with conntrack.
listener = conntrack.NewListener(listener,
conntrack.TrackWithName("http"),
conntrack.TrackWithTracing())
return listener, nil
}
// Run serves the HTTP endpoints.
func (h *Handler) Run(ctx context.Context, listener net.Listener, webConfig string) error {
if listener == nil {
var err error
listener, err = h.Listener()
if err != nil {
return err
}
}
mux := http.NewServeMux()
mux.Handle("/", h.router)
apiPath := "/api"
if h.options.RoutePrefix != "/" {
apiPath = h.options.RoutePrefix + apiPath
level.Info(h.logger).Log("msg", "Router prefix", "prefix", h.options.RoutePrefix)
}
av1 := route.New().
WithInstrumentation(h.metrics.instrumentHandlerWithPrefix("/api/v1")).
WithInstrumentation(setPathWithPrefix(apiPath + "/v1"))
h.apiV1.Register(av1)
mux.Handle(apiPath+"/v1/", http.StripPrefix(apiPath+"/v1", av1))
errlog := stdlog.New(log.NewStdlibAdapter(level.Error(h.logger)), "", 0)
spanNameFormatter := otelhttp.WithSpanNameFormatter(func(_ string, r *http.Request) string {
return fmt.Sprintf("%s %s", r.Method, r.URL.Path)
})
httpSrv := &http.Server{
Handler: withStackTracer(otelhttp.NewHandler(mux, "", spanNameFormatter), h.logger),
ErrorLog: errlog,
ReadTimeout: h.options.ReadTimeout,
}
errCh := make(chan error, 1)
go func() {
errCh <- toolkit_web.Serve(listener, httpSrv, &toolkit_web.FlagConfig{WebConfigFile: &webConfig}, h.logger)
}()
select {
case e := <-errCh:
return e
case <-ctx.Done():
httpSrv.Shutdown(ctx)
return nil
}
}
func (h *Handler) consoles(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
name := route.Param(ctx, "filepath")
file, err := http.Dir(h.options.ConsoleTemplatesPath).Open(name)
if err != nil {
http.Error(w, err.Error(), http.StatusNotFound)
return
}
defer file.Close()
text, err := io.ReadAll(file)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
ctx = httputil.ContextFromRequest(ctx, r)
// Provide URL parameters as a map for easy use. Advanced users may have need for
// parameters beyond the first, so provide RawParams.
rawParams, err := url.ParseQuery(r.URL.RawQuery)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
params := map[string]string{}
for k, v := range rawParams {
params[k] = v[0]
}
h.mtx.RLock()
els := h.config.GlobalConfig.ExternalLabels
h.mtx.RUnlock()
externalLabels := els.Map()
// Inject some convenience variables that are easier to remember for users
// who are not used to Go's templating system.
defs := []string{
"{{$rawParams := .RawParams }}",
"{{$params := .Params}}",
"{{$path := .Path}}",
"{{$externalLabels := .ExternalLabels}}",
}
data := struct {
RawParams url.Values
Params map[string]string
Path string
ExternalLabels map[string]string
}{
RawParams: rawParams,
Params: params,
Path: strings.TrimLeft(name, "/"),
ExternalLabels: externalLabels,
}
tmpl := template.NewTemplateExpander(
ctx,
strings.Join(append(defs, string(text)), ""),
"__console_"+name,
data,
h.now(),
template.QueryFunc(rules.EngineQueryFunc(h.queryEngine, h.storage)),
h.options.ExternalURL,
nil,
)
filenames, err := filepath.Glob(h.options.ConsoleLibrariesPath + "/*.lib")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
result, err := tmpl.ExpandHTML(filenames)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
io.WriteString(w, result)
}
func (h *Handler) runtimeInfo() (api_v1.RuntimeInfo, error) {
status := api_v1.RuntimeInfo{
StartTime: h.birth,
CWD: h.cwd,
GoroutineCount: runtime.NumGoroutine(),
GOMAXPROCS: runtime.GOMAXPROCS(0),
GOMEMLIMIT: debug.SetMemoryLimit(-1),
GOGC: os.Getenv("GOGC"),
GODEBUG: os.Getenv("GODEBUG"),
}
if h.options.TSDBRetentionDuration != 0 {
status.StorageRetention = h.options.TSDBRetentionDuration.String()
}
if h.options.TSDBMaxBytes != 0 {
if status.StorageRetention != "" {
status.StorageRetention += " or "
}
status.StorageRetention += h.options.TSDBMaxBytes.String()
}
metrics, err := h.gatherer.Gather()
if err != nil {
return status, fmt.Errorf("error gathering runtime status: %w", err)
}
for _, mF := range metrics {
switch *mF.Name {
case "prometheus_tsdb_wal_corruptions_total":
status.CorruptionCount = int64(toFloat64(mF))
case "prometheus_config_last_reload_successful":
status.ReloadConfigSuccess = toFloat64(mF) != 0
case "prometheus_config_last_reload_success_timestamp_seconds":
status.LastConfigTime = time.Unix(int64(toFloat64(mF)), 0).UTC()
}
}
return status, nil
}
func toFloat64(f *io_prometheus_client.MetricFamily) float64 {
m := f.Metric[0]
if m.Gauge != nil {
return m.Gauge.GetValue()
}
if m.Counter != nil {
return m.Counter.GetValue()
}
if m.Untyped != nil {
return m.Untyped.GetValue()
}
return math.NaN()
}
func (h *Handler) version(w http.ResponseWriter, _ *http.Request) {
dec := json.NewEncoder(w)
if err := dec.Encode(h.versionInfo); err != nil {
http.Error(w, fmt.Sprintf("error encoding JSON: %s", err), http.StatusInternalServerError)
}
}
func (h *Handler) quit(w http.ResponseWriter, _ *http.Request) {
var closed bool
h.quitOnce.Do(func() {
closed = true
close(h.quitCh)
fmt.Fprintf(w, "Requesting termination... Goodbye!")
})
if !closed {
fmt.Fprintf(w, "Termination already in progress.")
}
}
func (h *Handler) reload(w http.ResponseWriter, _ *http.Request) {
rc := make(chan error)
h.reloadCh <- rc
if err := <-rc; err != nil {
http.Error(w, fmt.Sprintf("failed to reload config: %s", err), http.StatusInternalServerError)
}
}
func (h *Handler) consolesPath() string {
if _, err := os.Stat(h.options.ConsoleTemplatesPath + "/index.html"); !os.IsNotExist(err) {
return h.options.ExternalURL.Path + "/consoles/index.html"
}
if h.options.UserAssetsPath != "" {
if _, err := os.Stat(h.options.UserAssetsPath + "/index.html"); !os.IsNotExist(err) {
return h.options.ExternalURL.Path + "/user/index.html"
}
}
return ""
}
func setPathWithPrefix(prefix string) func(handlerName string, handler http.HandlerFunc) http.HandlerFunc {
return func(handlerName string, handler http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
handler(w, r.WithContext(httputil.ContextWithPath(r.Context(), prefix+r.URL.Path)))
}
}
}