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main.go
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main.go
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// Copyright (c) The Thanos Authors.
// Licensed under the Apache License 2.0.
package main
import (
"context"
"fmt"
"io"
"os"
"os/signal"
"path/filepath"
"runtime"
"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"
"github.com/oklog/run"
"github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/version"
"github.com/thanos-io/thanos/pkg/tracing/client"
"go.uber.org/automaxprocs/maxprocs"
"gopkg.in/alecthomas/kingpin.v2"
)
const (
logFormatLogfmt = "logfmt"
logFormatJson = "json"
)
type setupFunc func(*run.Group, log.Logger, *prometheus.Registry, opentracing.Tracer, <-chan struct{}, 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. Possible options: logfmt or json.").
Default(logFormatLogfmt).Enum(logFormatLogfmt, logFormatJson)
tracingConfig := regCommonTracingFlags(app)
cmds := map[string]setupFunc{}
registerSidecar(cmds, app)
registerStore(cmds, app)
registerQuery(cmds, app)
registerRule(cmds, app)
registerCompact(cmds, app)
registerBucket(cmds, app, "bucket")
registerDownsample(cmds, app)
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{}),
)
// Some packages still use default Register. Replace to have those metrics.
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()
})
}
// Create a signal channel to dispatch reload events to sub-commands.
reloadCh := make(chan struct{}, 1)
if err := cmds[cmd](&g, logger, metrics, tracer, reloadCh, *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)
})
}
// Listen for reload signals.
{
cancel := make(chan struct{})
g.Add(func() error {
return reload(logger, cancel, reloadCh)
}, 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 reload(logger log.Logger, cancel <-chan struct{}, r chan<- struct{}) error {
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGHUP)
for {
select {
case s := <-c:
level.Info(logger).Log("msg", "caught signal. Reloading.", "signal", s)
select {
case r <- struct{}{}:
level.Info(logger).Log("msg", "relaod dispatched.")
default:
}
case <-cancel:
return errors.New("canceled")
}
}
}