forked from thanos-io/thanos
/
sidecar.go
497 lines (426 loc) · 15.5 KB
/
sidecar.go
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// Copyright (c) The Thanos Authors.
// Licensed under the Apache License 2.0.
package main
import (
"context"
"math"
"net/url"
"sync"
"time"
extflag "github.com/efficientgo/tools/extkingpin"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
grpc_logging "github.com/grpc-ecosystem/go-grpc-middleware/v2/interceptors/logging"
"github.com/grpc-ecosystem/go-grpc-middleware/v2/interceptors/tags"
"github.com/oklog/run"
"github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/model/labels"
"github.com/thanos-io/thanos/pkg/block/metadata"
"github.com/thanos-io/thanos/pkg/component"
"github.com/thanos-io/thanos/pkg/exemplars"
"github.com/thanos-io/thanos/pkg/extkingpin"
"github.com/thanos-io/thanos/pkg/extprom"
"github.com/thanos-io/thanos/pkg/httpconfig"
"github.com/thanos-io/thanos/pkg/info"
"github.com/thanos-io/thanos/pkg/info/infopb"
"github.com/thanos-io/thanos/pkg/logging"
meta "github.com/thanos-io/thanos/pkg/metadata"
thanosmodel "github.com/thanos-io/thanos/pkg/model"
"github.com/thanos-io/thanos/pkg/objstore/client"
"github.com/thanos-io/thanos/pkg/prober"
"github.com/thanos-io/thanos/pkg/promclient"
"github.com/thanos-io/thanos/pkg/reloader"
"github.com/thanos-io/thanos/pkg/rules"
"github.com/thanos-io/thanos/pkg/runutil"
grpcserver "github.com/thanos-io/thanos/pkg/server/grpc"
httpserver "github.com/thanos-io/thanos/pkg/server/http"
"github.com/thanos-io/thanos/pkg/shipper"
"github.com/thanos-io/thanos/pkg/store"
"github.com/thanos-io/thanos/pkg/store/labelpb"
"github.com/thanos-io/thanos/pkg/targets"
"github.com/thanos-io/thanos/pkg/tls"
)
func registerSidecar(app *extkingpin.App) {
cmd := app.Command(component.Sidecar.String(), "Sidecar for Prometheus server.")
conf := &sidecarConfig{}
conf.registerFlag(cmd)
cmd.Setup(func(g *run.Group, logger log.Logger, reg *prometheus.Registry, tracer opentracing.Tracer, _ <-chan struct{}, _ bool) error {
tagOpts, grpcLogOpts, err := logging.ParsegRPCOptions("", conf.reqLogConfig)
if err != nil {
return errors.Wrap(err, "error while parsing config for request logging")
}
rl := reloader.New(log.With(logger, "component", "reloader"),
extprom.WrapRegistererWithPrefix("thanos_sidecar_", reg),
&reloader.Options{
ReloadURL: reloader.ReloadURLFromBase(conf.prometheus.url),
CfgFile: conf.reloader.confFile,
CfgOutputFile: conf.reloader.envVarConfFile,
WatchedDirs: conf.reloader.ruleDirectories,
WatchInterval: conf.reloader.watchInterval,
RetryInterval: conf.reloader.retryInterval,
})
return runSidecar(g, logger, reg, tracer, rl, component.Sidecar, *conf, grpcLogOpts, tagOpts)
})
}
func runSidecar(
g *run.Group,
logger log.Logger,
reg *prometheus.Registry,
tracer opentracing.Tracer,
reloader *reloader.Reloader,
comp component.Component,
conf sidecarConfig,
grpcLogOpts []grpc_logging.Option,
tagOpts []tags.Option,
) error {
httpConfContentYaml, err := conf.prometheus.httpClient.Content()
if err != nil {
return errors.Wrap(err, "getting http client config")
}
httpClientConfig, err := httpconfig.NewClientConfigFromYAML(httpConfContentYaml)
if err != nil {
return errors.Wrap(err, "parsing http config YAML")
}
httpClient, err := httpconfig.NewHTTPClient(*httpClientConfig, "thanos-sidecar")
if err != nil {
return errors.Wrap(err, "Improper http client config")
}
reloader.SetHttpClient(*httpClient)
var m = &promMetadata{
promURL: conf.prometheus.url,
// Start out with the full time range. The shipper will constrain it later.
// TODO(fabxc): minimum timestamp is never adjusted if shipping is disabled.
mint: conf.limitMinTime.PrometheusTimestamp(),
maxt: math.MaxInt64,
limitMinTime: conf.limitMinTime,
client: promclient.NewWithTracingClient(logger, httpClient, "thanos-sidecar"),
}
confContentYaml, err := conf.objStore.Content()
if err != nil {
return errors.Wrap(err, "getting object store config")
}
var uploads = true
if len(confContentYaml) == 0 {
level.Info(logger).Log("msg", "no supported bucket was configured, uploads will be disabled")
uploads = false
}
grpcProbe := prober.NewGRPC()
httpProbe := prober.NewHTTP()
statusProber := prober.Combine(
httpProbe,
grpcProbe,
prober.NewInstrumentation(comp, logger, extprom.WrapRegistererWithPrefix("thanos_", reg)),
)
srv := httpserver.New(logger, reg, comp, httpProbe,
httpserver.WithListen(conf.http.bindAddress),
httpserver.WithGracePeriod(time.Duration(conf.http.gracePeriod)),
httpserver.WithTLSConfig(conf.http.tlsConfig),
)
g.Add(func() error {
statusProber.Healthy()
return srv.ListenAndServe()
}, func(err error) {
statusProber.NotReady(err)
defer statusProber.NotHealthy(err)
srv.Shutdown(err)
})
// Setup all the concurrent groups.
{
promUp := promauto.With(reg).NewGauge(prometheus.GaugeOpts{
Name: "thanos_sidecar_prometheus_up",
Help: "Boolean indicator whether the sidecar can reach its Prometheus peer.",
})
ctx, cancel := context.WithCancel(context.Background())
g.Add(func() error {
// Only check Prometheus's flags when upload is enabled.
if uploads {
// Check prometheus's flags to ensure same sidecar flags.
if err := validatePrometheus(ctx, m.client, logger, conf.shipper.ignoreBlockSize, m); err != nil {
return errors.Wrap(err, "validate Prometheus flags")
}
}
// We retry infinitely until we reach and fetch BuildVersion from our Prometheus.
err := runutil.Retry(2*time.Second, ctx.Done(), func() error {
if err := m.BuildVersion(ctx); err != nil {
level.Warn(logger).Log(
"msg", "failed to fetch prometheus version. Is Prometheus running? Retrying",
"err", err,
)
return err
}
level.Info(logger).Log(
"msg", "successfully loaded prometheus version",
)
return nil
})
if err != nil {
return errors.Wrap(err, "failed to get prometheus version")
}
// Blocking query of external labels before joining as a Source Peer into gossip.
// We retry infinitely until we reach and fetch labels from our Prometheus.
err = runutil.Retry(2*time.Second, ctx.Done(), func() error {
if err := m.UpdateLabels(ctx); err != nil {
level.Warn(logger).Log(
"msg", "failed to fetch initial external labels. Is Prometheus running? Retrying",
"err", err,
)
promUp.Set(0)
statusProber.NotReady(err)
return err
}
level.Info(logger).Log(
"msg", "successfully loaded prometheus external labels",
"external_labels", m.Labels().String(),
)
promUp.Set(1)
statusProber.Ready()
return nil
})
if err != nil {
return errors.Wrap(err, "initial external labels query")
}
if len(m.Labels()) == 0 {
return errors.New("no external labels configured on Prometheus server, uniquely identifying external labels must be configured; see https://thanos.io/tip/thanos/storage.md#external-labels for details.")
}
// Periodically query the Prometheus config. We use this as a heartbeat as well as for updating
// the external labels we apply.
return runutil.Repeat(30*time.Second, ctx.Done(), func() error {
iterCtx, iterCancel := context.WithTimeout(context.Background(), 5*time.Second)
defer iterCancel()
if err := m.UpdateLabels(iterCtx); err != nil {
level.Warn(logger).Log("msg", "heartbeat failed", "err", err)
promUp.Set(0)
statusProber.NotReady(err)
} else {
promUp.Set(1)
statusProber.Ready()
}
return nil
})
}, func(error) {
cancel()
})
}
{
ctx, cancel := context.WithCancel(context.Background())
g.Add(func() error {
return reloader.Watch(ctx)
}, func(error) {
cancel()
})
}
{
c := promclient.NewWithTracingClient(logger, httpClient, httpconfig.ThanosUserAgent)
promStore, err := store.NewPrometheusStore(logger, reg, c, conf.prometheus.url, component.Sidecar, m.Labels, m.Timestamps, m.Version)
if err != nil {
return errors.Wrap(err, "create Prometheus store")
}
tlsCfg, err := tls.NewServerConfig(log.With(logger, "protocol", "gRPC"),
conf.grpc.tlsSrvCert, conf.grpc.tlsSrvKey, conf.grpc.tlsSrvClientCA)
if err != nil {
return errors.Wrap(err, "setup gRPC server")
}
exemplarSrv := exemplars.NewPrometheus(conf.prometheus.url, c, m.Labels)
infoSrv := info.NewInfoServer(
component.Sidecar.String(),
info.WithLabelSetFunc(func() []labelpb.ZLabelSet {
return promStore.LabelSet()
}),
info.WithStoreInfoFunc(func() *infopb.StoreInfo {
if httpProbe.IsReady() {
mint, maxt := promStore.Timestamps()
return &infopb.StoreInfo{
MinTime: mint,
MaxTime: maxt,
}
}
return nil
}),
info.WithExemplarsInfoFunc(),
info.WithRulesInfoFunc(),
info.WithTargetsInfoFunc(),
info.WithMetricMetadataInfoFunc(),
)
s := grpcserver.New(logger, reg, tracer, grpcLogOpts, tagOpts, comp, grpcProbe,
grpcserver.WithServer(store.RegisterStoreServer(promStore)),
grpcserver.WithServer(rules.RegisterRulesServer(rules.NewPrometheus(conf.prometheus.url, c, m.Labels))),
grpcserver.WithServer(targets.RegisterTargetsServer(targets.NewPrometheus(conf.prometheus.url, c, m.Labels))),
grpcserver.WithServer(meta.RegisterMetadataServer(meta.NewPrometheus(conf.prometheus.url, c))),
grpcserver.WithServer(exemplars.RegisterExemplarsServer(exemplarSrv)),
grpcserver.WithServer(info.RegisterInfoServer(infoSrv)),
grpcserver.WithListen(conf.grpc.bindAddress),
grpcserver.WithGracePeriod(time.Duration(conf.grpc.gracePeriod)),
grpcserver.WithTLSConfig(tlsCfg),
)
g.Add(func() error {
statusProber.Ready()
return s.ListenAndServe()
}, func(err error) {
statusProber.NotReady(err)
s.Shutdown(err)
})
}
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.Sidecar.String())
if err != nil {
return err
}
// Ensure we close up everything properly.
defer func() {
if err != nil {
runutil.CloseWithLogOnErr(logger, bkt, "bucket client")
}
}()
if err := promclient.IsWALDirAccessible(conf.tsdb.path); err != nil {
level.Error(logger).Log("err", err)
}
ctx, cancel := context.WithCancel(context.Background())
g.Add(func() error {
defer runutil.CloseWithLogOnErr(logger, bkt, "bucket client")
promReadyTimeout := conf.prometheus.readyTimeout
extLabelsCtx, cancel := context.WithTimeout(ctx, promReadyTimeout)
defer cancel()
if err := runutil.Retry(2*time.Second, extLabelsCtx.Done(), func() error {
if len(m.Labels()) == 0 {
return errors.New("not uploading as no external labels are configured yet - is Prometheus healthy/reachable?")
}
return nil
}); err != nil {
return errors.Wrapf(err, "aborting as no external labels found after waiting %s", promReadyTimeout)
}
s := shipper.New(logger, reg, conf.tsdb.path, bkt, m.Labels, metadata.SidecarSource,
conf.shipper.uploadCompacted, conf.shipper.allowOutOfOrderUpload, metadata.HashFunc(conf.shipper.hashFunc))
return runutil.Repeat(30*time.Second, ctx.Done(), func() error {
if uploaded, err := s.Sync(ctx); err != nil {
level.Warn(logger).Log("err", err, "uploaded", uploaded)
}
minTime, _, err := s.Timestamps()
if err != nil {
level.Warn(logger).Log("msg", "reading timestamps failed", "err", err)
return nil
}
m.UpdateTimestamps(minTime, math.MaxInt64)
return nil
})
}, func(error) {
cancel()
})
}
level.Info(logger).Log("msg", "starting sidecar")
return nil
}
func validatePrometheus(ctx context.Context, client *promclient.Client, logger log.Logger, ignoreBlockSize bool, m *promMetadata) error {
var (
flagErr error
flags promclient.Flags
)
if err := runutil.Retry(2*time.Second, ctx.Done(), func() error {
if flags, flagErr = client.ConfiguredFlags(ctx, m.promURL); flagErr != nil && flagErr != promclient.ErrFlagEndpointNotFound {
level.Warn(logger).Log("msg", "failed to get Prometheus flags. Is Prometheus running? Retrying", "err", flagErr)
return errors.Wrapf(flagErr, "fetch Prometheus flags")
}
return nil
}); err != nil {
return errors.Wrapf(err, "fetch Prometheus flags")
}
if flagErr != nil {
level.Warn(logger).Log("msg", "failed to check Prometheus flags, due to potentially older Prometheus. No extra validation is done.", "err", flagErr)
return nil
}
// Check if compaction is disabled.
if flags.TSDBMinTime != flags.TSDBMaxTime {
if !ignoreBlockSize {
return errors.Errorf("found that TSDB Max time is %s and Min time is %s. "+
"Compaction needs to be disabled (storage.tsdb.min-block-duration = storage.tsdb.max-block-duration)", flags.TSDBMaxTime, flags.TSDBMinTime)
}
level.Warn(logger).Log("msg", "flag to ignore Prometheus min/max block duration flags differing is being used. If the upload of a 2h block fails and a Prometheus compaction happens that block may be missing from your Thanos bucket storage.")
}
// Check if block time is 2h.
if flags.TSDBMinTime != model.Duration(2*time.Hour) {
level.Warn(logger).Log("msg", "found that TSDB block time is not 2h. Only 2h block time is recommended.", "block-time", flags.TSDBMinTime)
}
return nil
}
type promMetadata struct {
promURL *url.URL
mtx sync.Mutex
mint int64
maxt int64
labels labels.Labels
promVersion string
limitMinTime thanosmodel.TimeOrDurationValue
client *promclient.Client
}
func (s *promMetadata) UpdateLabels(ctx context.Context) error {
elset, err := s.client.ExternalLabels(ctx, s.promURL)
if err != nil {
return err
}
s.mtx.Lock()
defer s.mtx.Unlock()
s.labels = elset
return nil
}
func (s *promMetadata) UpdateTimestamps(mint, maxt int64) {
s.mtx.Lock()
defer s.mtx.Unlock()
if mint < s.limitMinTime.PrometheusTimestamp() {
mint = s.limitMinTime.PrometheusTimestamp()
}
s.mint = mint
s.maxt = maxt
}
func (s *promMetadata) Labels() labels.Labels {
s.mtx.Lock()
defer s.mtx.Unlock()
return s.labels
}
func (s *promMetadata) Timestamps() (mint, maxt int64) {
s.mtx.Lock()
defer s.mtx.Unlock()
return s.mint, s.maxt
}
func (s *promMetadata) BuildVersion(ctx context.Context) error {
ver, err := s.client.BuildVersion(ctx, s.promURL)
if err != nil {
return err
}
s.mtx.Lock()
defer s.mtx.Unlock()
s.promVersion = ver
return nil
}
func (s *promMetadata) Version() string {
s.mtx.Lock()
defer s.mtx.Unlock()
return s.promVersion
}
type sidecarConfig struct {
http httpConfig
grpc grpcConfig
prometheus prometheusConfig
tsdb tsdbConfig
reloader reloaderConfig
reqLogConfig *extflag.PathOrContent
objStore extflag.PathOrContent
shipper shipperConfig
limitMinTime thanosmodel.TimeOrDurationValue
}
func (sc *sidecarConfig) registerFlag(cmd extkingpin.FlagClause) {
sc.http.registerFlag(cmd)
sc.grpc.registerFlag(cmd)
sc.prometheus.registerFlag(cmd)
sc.tsdb.registerFlag(cmd)
sc.reloader.registerFlag(cmd)
sc.reqLogConfig = extkingpin.RegisterRequestLoggingFlags(cmd)
sc.objStore = *extkingpin.RegisterCommonObjStoreFlags(cmd, "", false)
sc.shipper.registerFlag(cmd)
cmd.Flag("min-time", "Start of time range limit to serve. Thanos sidecar will serve only metrics, which happened later than this value. Option can be a constant time in RFC3339 format or time duration relative to current time, such as -1d or 2h45m. Valid duration units are ms, s, m, h, d, w, y.").
Default("0000-01-01T00:00:00Z").SetValue(&sc.limitMinTime)
}