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main.go
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main.go
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// Copyright 2015 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.
// The main package for the Prometheus server executable.
package main
import (
"flag"
"fmt"
_ "net/http/pprof" // Comment this line to disable pprof endpoint.
"os"
"os/signal"
"syscall"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/log"
"github.com/prometheus/common/version"
"golang.org/x/net/context"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/notifier"
"github.com/prometheus/prometheus/promql"
"github.com/prometheus/prometheus/retrieval"
"github.com/prometheus/prometheus/rules"
"github.com/prometheus/prometheus/storage"
"github.com/prometheus/prometheus/storage/local"
"github.com/prometheus/prometheus/storage/remote"
"github.com/prometheus/prometheus/web"
)
func main() {
os.Exit(Main())
}
var (
configSuccess = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "prometheus",
Name: "config_last_reload_successful",
Help: "Whether the last configuration reload attempt was successful.",
})
configSuccessTime = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "prometheus",
Name: "config_last_reload_success_timestamp_seconds",
Help: "Timestamp of the last successful configuration reload.",
})
)
func init() {
prometheus.MustRegister(version.NewCollector("prometheus"))
}
// Main manages the startup and shutdown lifecycle of the entire Prometheus server.
func Main() int {
if err := parse(os.Args[1:]); err != nil {
log.Error(err)
return 2
}
if cfg.printVersion {
fmt.Fprintln(os.Stdout, version.Print("prometheus"))
return 0
}
log.Infoln("Starting prometheus", version.Info())
log.Infoln("Build context", version.BuildContext())
var (
sampleAppender = storage.Fanout{}
reloadables []Reloadable
)
var localStorage local.Storage
switch cfg.localStorageEngine {
case "persisted":
localStorage = local.NewMemorySeriesStorage(&cfg.storage)
sampleAppender = storage.Fanout{localStorage}
case "none":
localStorage = &local.NoopStorage{}
default:
log.Errorf("Invalid local storage engine %q", cfg.localStorageEngine)
return 1
}
remoteStorage, err := remote.New(&cfg.remote)
if err != nil {
log.Errorf("Error initializing remote storage: %s", err)
return 1
}
if remoteStorage != nil {
sampleAppender = append(sampleAppender, remoteStorage)
reloadables = append(reloadables, remoteStorage)
}
reloadableRemoteStorage := remote.NewConfigurable()
sampleAppender = append(sampleAppender, reloadableRemoteStorage)
reloadables = append(reloadables, reloadableRemoteStorage)
var (
notifier = notifier.New(&cfg.notifier)
targetManager = retrieval.NewTargetManager(sampleAppender)
queryEngine = promql.NewEngine(localStorage, &cfg.queryEngine)
ctx, cancelCtx = context.WithCancel(context.Background())
)
ruleManager := rules.NewManager(&rules.ManagerOptions{
SampleAppender: sampleAppender,
Notifier: notifier,
QueryEngine: queryEngine,
Context: ctx,
ExternalURL: cfg.web.ExternalURL,
})
cfg.web.Context = ctx
cfg.web.Storage = localStorage
cfg.web.QueryEngine = queryEngine
cfg.web.TargetManager = targetManager
cfg.web.RuleManager = ruleManager
cfg.web.Notifier = notifier
cfg.web.Version = &web.PrometheusVersion{
Version: version.Version,
Revision: version.Revision,
Branch: version.Branch,
BuildUser: version.BuildUser,
BuildDate: version.BuildDate,
GoVersion: version.GoVersion,
}
cfg.web.Flags = map[string]string{}
cfg.fs.VisitAll(func(f *flag.Flag) {
cfg.web.Flags[f.Name] = f.Value.String()
})
webHandler := web.New(&cfg.web)
reloadables = append(reloadables, targetManager, ruleManager, webHandler, notifier)
if err := reloadConfig(cfg.configFile, reloadables...); err != nil {
log.Errorf("Error loading config: %s", err)
return 1
}
// Wait for reload or termination signals. Start the handler for SIGHUP as
// early as possible, but ignore it until we are ready to handle reloading
// our config.
hup := make(chan os.Signal)
hupReady := make(chan bool)
signal.Notify(hup, syscall.SIGHUP)
go func() {
<-hupReady
for {
select {
case <-hup:
if err := reloadConfig(cfg.configFile, reloadables...); err != nil {
log.Errorf("Error reloading config: %s", err)
}
case rc := <-webHandler.Reload():
if err := reloadConfig(cfg.configFile, reloadables...); err != nil {
log.Errorf("Error reloading config: %s", err)
rc <- err
} else {
rc <- nil
}
}
}
}()
// Start all components. The order is NOT arbitrary.
if err := localStorage.Start(); err != nil {
log.Errorln("Error opening memory series storage:", err)
return 1
}
defer func() {
if err := localStorage.Stop(); err != nil {
log.Errorln("Error stopping storage:", err)
}
}()
if remoteStorage != nil {
remoteStorage.Start()
defer remoteStorage.Stop()
}
defer reloadableRemoteStorage.Stop()
// The storage has to be fully initialized before registering.
if instrumentedStorage, ok := localStorage.(prometheus.Collector); ok {
prometheus.MustRegister(instrumentedStorage)
}
prometheus.MustRegister(notifier)
prometheus.MustRegister(configSuccess)
prometheus.MustRegister(configSuccessTime)
// The notifier is a dependency of the rule manager. It has to be
// started before and torn down afterwards.
go notifier.Run()
defer notifier.Stop()
go ruleManager.Run()
defer ruleManager.Stop()
go targetManager.Run()
defer targetManager.Stop()
// Shutting down the query engine before the rule manager will cause pending queries
// to be canceled and ensures a quick shutdown of the rule manager.
defer cancelCtx()
go webHandler.Run()
// Wait for reload or termination signals.
close(hupReady) // Unblock SIGHUP handler.
term := make(chan os.Signal)
signal.Notify(term, os.Interrupt, syscall.SIGTERM)
select {
case <-term:
log.Warn("Received SIGTERM, exiting gracefully...")
case <-webHandler.Quit():
log.Warn("Received termination request via web service, exiting gracefully...")
case err := <-webHandler.ListenError():
log.Errorln("Error starting web server, exiting gracefully:", err)
}
log.Info("See you next time!")
return 0
}
// Reloadable things can change their internal state to match a new config
// and handle failure gracefully.
type Reloadable interface {
ApplyConfig(*config.Config) error
}
func reloadConfig(filename string, rls ...Reloadable) (err error) {
log.Infof("Loading configuration file %s", filename)
defer func() {
if err == nil {
configSuccess.Set(1)
configSuccessTime.Set(float64(time.Now().Unix()))
} else {
configSuccess.Set(0)
}
}()
conf, err := config.LoadFile(filename)
if err != nil {
return fmt.Errorf("couldn't load configuration (-config.file=%s): %v", filename, err)
}
// Add AlertmanagerConfigs for legacy Alertmanager URL flags.
for us := range cfg.alertmanagerURLs {
acfg, err := parseAlertmanagerURLToConfig(us)
if err != nil {
return err
}
conf.AlertingConfig.AlertmanagerConfigs = append(conf.AlertingConfig.AlertmanagerConfigs, acfg)
}
failed := false
for _, rl := range rls {
if err := rl.ApplyConfig(conf); err != nil {
log.Error("Failed to apply configuration: ", err)
failed = true
}
}
if failed {
return fmt.Errorf("one or more errors occurred while applying the new configuration (-config.file=%s)", filename)
}
return nil
}