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main.go
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main.go
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package main
import (
"context"
"crypto/tls"
"crypto/x509"
"fmt"
"io"
"io/ioutil"
"math"
"net"
"net/http"
"net/http/pprof"
"os"
"os/signal"
"path/filepath"
"runtime"
"runtime/debug"
"syscall"
gmetrics "github.com/armon/go-metrics"
gprom "github.com/armon/go-metrics/prometheus"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
grpc_recovery "github.com/grpc-ecosystem/go-grpc-middleware/recovery"
grpc_prometheus "github.com/grpc-ecosystem/go-grpc-prometheus"
"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/promhttp"
"github.com/prometheus/common/version"
"github.com/thanos-io/thanos/pkg/component"
"github.com/thanos-io/thanos/pkg/prober"
"github.com/thanos-io/thanos/pkg/runutil"
"github.com/thanos-io/thanos/pkg/store/storepb"
"github.com/thanos-io/thanos/pkg/tracing"
"github.com/thanos-io/thanos/pkg/tracing/client"
"go.uber.org/automaxprocs/maxprocs"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/status"
"gopkg.in/alecthomas/kingpin.v2"
)
const (
logFormatLogfmt = "logfmt"
logFormatJson = "json"
)
type setupFunc func(*run.Group, log.Logger, *prometheus.Registry, opentracing.Tracer, bool) error
func main() {
if os.Getenv("DEBUG") != "" {
runtime.SetMutexProfileFraction(10)
runtime.SetBlockProfileRate(10)
}
app := kingpin.New(filepath.Base(os.Args[0]), "A block storage based long-term storage for Prometheus")
app.Version(version.Print("thanos"))
app.HelpFlag.Short('h')
debugName := app.Flag("debug.name", "Name to add as prefix to log lines.").Hidden().String()
logLevel := app.Flag("log.level", "Log filtering level.").
Default("info").Enum("error", "warn", "info", "debug")
logFormat := app.Flag("log.format", "Log format to use.").
Default(logFormatLogfmt).Enum(logFormatLogfmt, logFormatJson)
tracingConfig := regCommonTracingFlags(app)
cmds := map[string]setupFunc{}
registerSidecar(cmds, app)
registerStore(cmds, app, "store")
registerQuery(cmds, app)
registerRule(cmds, app)
registerCompact(cmds, app)
registerBucket(cmds, app, "bucket")
registerDownsample(cmds, app, "downsample")
registerReceive(cmds, app)
registerChecks(cmds, app, "check")
cmd, err := app.Parse(os.Args[1:])
if err != nil {
fmt.Fprintln(os.Stderr, errors.Wrapf(err, "Error parsing commandline arguments"))
app.Usage(os.Args[1:])
os.Exit(2)
}
var logger log.Logger
{
var lvl level.Option
switch *logLevel {
case "error":
lvl = level.AllowError()
case "warn":
lvl = level.AllowWarn()
case "info":
lvl = level.AllowInfo()
case "debug":
lvl = level.AllowDebug()
default:
panic("unexpected log level")
}
logger = log.NewLogfmtLogger(log.NewSyncWriter(os.Stderr))
if *logFormat == logFormatJson {
logger = log.NewJSONLogger(log.NewSyncWriter(os.Stderr))
}
logger = level.NewFilter(logger, lvl)
if *debugName != "" {
logger = log.With(logger, "name", *debugName)
}
logger = log.With(logger, "ts", log.DefaultTimestampUTC, "caller", log.DefaultCaller)
}
loggerAdapter := func(template string, args ...interface{}) {
level.Debug(logger).Log("msg", fmt.Sprintf(template, args))
}
// Running in container with limits but with empty/wrong value of GOMAXPROCS env var could lead to throttling by cpu
// maxprocs will automate adjustment by using cgroups info about cpu limit if it set as value for runtime.GOMAXPROCS
undo, err := maxprocs.Set(maxprocs.Logger(loggerAdapter))
defer undo()
if err != nil {
fmt.Fprintln(os.Stderr, errors.Wrapf(err, "failed to set GOMAXPROCS: %v", err))
}
metrics := prometheus.NewRegistry()
metrics.MustRegister(
version.NewCollector("thanos"),
prometheus.NewGoCollector(),
prometheus.NewProcessCollector(prometheus.ProcessCollectorOpts{}),
)
prometheus.DefaultRegisterer = metrics
// Memberlist uses go-metrics.
sink, err := gprom.NewPrometheusSink()
if err != nil {
fmt.Fprintln(os.Stderr, errors.Wrapf(err, "%s command failed", cmd))
os.Exit(1)
}
gmetricsConfig := gmetrics.DefaultConfig("thanos_" + cmd)
gmetricsConfig.EnableRuntimeMetrics = false
if _, err = gmetrics.NewGlobal(gmetricsConfig, sink); err != nil {
fmt.Fprintln(os.Stderr, errors.Wrapf(err, "%s command failed", cmd))
os.Exit(1)
}
var g run.Group
var tracer opentracing.Tracer
// Setup optional tracing.
{
ctx := context.Background()
var closer io.Closer
var confContentYaml []byte
confContentYaml, err = tracingConfig.Content()
if err != nil {
level.Error(logger).Log("msg", "getting tracing config failed", "err", err)
os.Exit(1)
}
if len(confContentYaml) == 0 {
level.Info(logger).Log("msg", "Tracing will be disabled")
tracer = client.NoopTracer()
} else {
tracer, closer, err = client.NewTracer(ctx, logger, metrics, confContentYaml)
if err != nil {
fmt.Fprintln(os.Stderr, errors.Wrapf(err, "tracing failed"))
os.Exit(1)
}
}
// This is bad, but Prometheus does not support any other tracer injections than just global one.
// TODO(bplotka): Work with basictracer to handle gracefully tracker mismatches, and also with Prometheus to allow
// tracer injection.
opentracing.SetGlobalTracer(tracer)
ctx, cancel := context.WithCancel(ctx)
g.Add(func() error {
<-ctx.Done()
return ctx.Err()
}, func(error) {
if closer != nil {
if err := closer.Close(); err != nil {
level.Warn(logger).Log("msg", "closing tracer failed", "err", err)
}
}
cancel()
})
}
if err := cmds[cmd](&g, logger, metrics, tracer, *logLevel == "debug"); err != nil {
level.Error(logger).Log("err", errors.Wrapf(err, "%s command failed", cmd))
os.Exit(1)
}
// Listen for termination signals.
{
cancel := make(chan struct{})
g.Add(func() error {
return interrupt(logger, cancel)
}, func(error) {
close(cancel)
})
}
if err := g.Run(); err != nil {
level.Error(logger).Log("msg", "running command failed", "err", err)
os.Exit(1)
}
level.Info(logger).Log("msg", "exiting")
}
func interrupt(logger log.Logger, cancel <-chan struct{}) error {
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGINT, syscall.SIGTERM)
select {
case s := <-c:
level.Info(logger).Log("msg", "caught signal. Exiting.", "signal", s)
return nil
case <-cancel:
return errors.New("canceled")
}
}
func registerProfile(mux *http.ServeMux) {
mux.HandleFunc("/debug/pprof/", pprof.Index)
mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
mux.Handle("/debug/pprof/block", pprof.Handler("block"))
mux.Handle("/debug/pprof/goroutine", pprof.Handler("goroutine"))
mux.Handle("/debug/pprof/heap", pprof.Handler("heap"))
mux.Handle("/debug/pprof/threadcreate", pprof.Handler("threadcreate"))
}
func registerMetrics(mux *http.ServeMux, g prometheus.Gatherer) {
mux.Handle("/metrics", promhttp.HandlerFor(g, promhttp.HandlerOpts{}))
}
func defaultGRPCServerOpts(logger log.Logger, cert, key, clientCA string) ([]grpc.ServerOption, error) {
opts := []grpc.ServerOption{}
if key == "" && cert == "" {
if clientCA != "" {
return nil, errors.New("when a client CA is used a server key and certificate must also be provided")
}
level.Info(logger).Log("msg", "disabled TLS, key and cert must be set to enable")
return opts, nil
}
if key == "" || cert == "" {
return nil, errors.New("both server key and certificate must be provided")
}
tlsCfg := &tls.Config{
MinVersion: tls.VersionTLS12,
}
tlsCert, err := tls.LoadX509KeyPair(cert, key)
if err != nil {
return nil, errors.Wrap(err, "server credentials")
}
level.Info(logger).Log("msg", "enabled gRPC server side TLS")
tlsCfg.Certificates = []tls.Certificate{tlsCert}
if clientCA != "" {
caPEM, err := ioutil.ReadFile(clientCA)
if err != nil {
return nil, errors.Wrap(err, "reading client CA")
}
certPool := x509.NewCertPool()
if !certPool.AppendCertsFromPEM(caPEM) {
return nil, errors.Wrap(err, "building client CA")
}
tlsCfg.ClientCAs = certPool
tlsCfg.ClientAuth = tls.RequireAndVerifyClientCert
level.Info(logger).Log("msg", "gRPC server TLS client verification enabled")
}
return append(opts, grpc.Creds(credentials.NewTLS(tlsCfg))), nil
}
func newStoreGRPCServer(logger log.Logger, reg *prometheus.Registry, tracer opentracing.Tracer, srv storepb.StoreServer, opts []grpc.ServerOption) *grpc.Server {
met := grpc_prometheus.NewServerMetrics()
met.EnableHandlingTimeHistogram(
grpc_prometheus.WithHistogramBuckets([]float64{
0.001, 0.01, 0.05, 0.1, 0.2, 0.4, 0.8, 1.6, 3.2, 6.4,
}),
)
panicsTotal := prometheus.NewCounter(prometheus.CounterOpts{
Name: "thanos_grpc_req_panics_recovered_total",
Help: "Total number of gRPC requests recovered from internal panic.",
})
reg.MustRegister(met, panicsTotal)
grpcPanicRecoveryHandler := func(p interface{}) (err error) {
panicsTotal.Inc()
level.Error(logger).Log("msg", "recovered from panic", "panic", p, "stack", debug.Stack())
return status.Errorf(codes.Internal, "%s", p)
}
opts = append(opts,
grpc.MaxSendMsgSize(math.MaxInt32),
grpc_middleware.WithUnaryServerChain(
met.UnaryServerInterceptor(),
tracing.UnaryServerInterceptor(tracer),
grpc_recovery.UnaryServerInterceptor(grpc_recovery.WithRecoveryHandler(grpcPanicRecoveryHandler)),
),
grpc_middleware.WithStreamServerChain(
met.StreamServerInterceptor(),
tracing.StreamServerInterceptor(tracer),
grpc_recovery.StreamServerInterceptor(grpc_recovery.WithRecoveryHandler(grpcPanicRecoveryHandler)),
),
)
s := grpc.NewServer(opts...)
storepb.RegisterStoreServer(s, srv)
met.InitializeMetrics(s)
return s
}
// TODO Remove once all components are migrated to the new scheduleHTTPServer.
// metricHTTPListenGroup is a run.Group that servers HTTP endpoint with only Prometheus metrics.
func metricHTTPListenGroup(g *run.Group, logger log.Logger, reg *prometheus.Registry, httpBindAddr string) error {
mux := http.NewServeMux()
registerMetrics(mux, reg)
registerProfile(mux)
l, err := net.Listen("tcp", httpBindAddr)
if err != nil {
return errors.Wrap(err, "listen metrics address")
}
g.Add(func() error {
level.Info(logger).Log("msg", "Listening for metrics", "address", httpBindAddr)
return errors.Wrap(http.Serve(l, mux), "serve metrics")
}, func(error) {
runutil.CloseWithLogOnErr(logger, l, "metric listener")
})
return nil
}
// scheduleHTTPServer starts a run.Group that servers HTTP endpoint with default endpoints providing Prometheus metrics,
// profiling and liveness/readiness probes.
func scheduleHTTPServer(g *run.Group, logger log.Logger, reg *prometheus.Registry, readinessProber *prober.Prober, httpBindAddr string, handler http.Handler, comp component.Component) error {
mux := http.NewServeMux()
registerMetrics(mux, reg)
registerProfile(mux)
readinessProber.RegisterInMux(mux)
if handler != nil {
mux.Handle("/", handler)
}
l, err := net.Listen("tcp", httpBindAddr)
if err != nil {
return errors.Wrap(err, "listen metrics address")
}
g.Add(func() error {
level.Info(logger).Log("msg", "listening for requests and metrics", "component", comp.String(), "address", httpBindAddr)
readinessProber.SetHealthy()
return errors.Wrapf(http.Serve(l, mux), "serve %s and metrics", comp.String())
}, func(err error) {
readinessProber.SetNotHealthy(err)
runutil.CloseWithLogOnErr(logger, l, "%s and metric listener", comp.String())
})
return nil
}