mirror of
https://github.com/prometheus/prometheus.git
synced 2024-12-26 06:04:05 -08:00
268 lines
8.3 KiB
Go
268 lines
8.3 KiB
Go
// Copyright 2013 Prometheus Team
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"flag"
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"os"
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"os/signal"
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"sync"
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"syscall"
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"time"
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"github.com/golang/glog"
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"github.com/prometheus/client_golang/extraction"
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clientmodel "github.com/prometheus/client_golang/model"
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registry "github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/prometheus/config"
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"github.com/prometheus/prometheus/notification"
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"github.com/prometheus/prometheus/retrieval"
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"github.com/prometheus/prometheus/rules/manager"
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"github.com/prometheus/prometheus/storage/local"
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"github.com/prometheus/prometheus/storage/remote"
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"github.com/prometheus/prometheus/storage/remote/opentsdb"
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"github.com/prometheus/prometheus/web"
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"github.com/prometheus/prometheus/web/api"
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)
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const deletionBatchSize = 100
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// Commandline flags.
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var (
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configFile = flag.String("configFile", "prometheus.conf", "Prometheus configuration file name.")
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metricsStoragePath = flag.String("metricsStoragePath", "/tmp/metrics", "Base path for metrics storage.")
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alertmanagerUrl = flag.String("alertmanager.url", "", "The URL of the alert manager to send notifications to.")
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remoteTSDBUrl = flag.String("storage.remote.url", "", "The URL of the OpenTSDB instance to send samples to.")
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remoteTSDBTimeout = flag.Duration("storage.remote.timeout", 30*time.Second, "The timeout to use when sending samples to OpenTSDB.")
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samplesQueueCapacity = flag.Int("storage.queue.samplesCapacity", 4096, "The size of the unwritten samples queue.")
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memoryEvictionInterval = flag.Duration("storage.memory.evictionInterval", 15*time.Minute, "The period at which old data is evicted from memory.")
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memoryRetentionPeriod = flag.Duration("storage.memory.retentionPeriod", time.Hour, "The period of time to retain in memory during evictions.")
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storagePurgeInterval = flag.Duration("storage.purgeInterval", time.Hour, "The period at which old data is deleted completely from storage.")
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storageRetentionPeriod = flag.Duration("storage.retentionPeriod", 15*24*time.Hour, "The period of time to retain in storage.")
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notificationQueueCapacity = flag.Int("alertmanager.notificationQueueCapacity", 100, "The size of the queue for pending alert manager notifications.")
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printVersion = flag.Bool("version", false, "print version information")
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)
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type prometheus struct {
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unwrittenSamples chan *extraction.Result
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ruleManager manager.RuleManager
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targetManager retrieval.TargetManager
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notificationHandler *notification.NotificationHandler
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storage local.Storage
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remoteTSDBQueue *remote.TSDBQueueManager
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webService *web.WebService
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closeOnce sync.Once
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}
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// NewPrometheus creates a new prometheus object based on flag values.
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// Call Serve() to start serving and Close() for clean shutdown.
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func NewPrometheus() *prometheus {
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conf, err := config.LoadFromFile(*configFile)
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if err != nil {
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glog.Fatalf("Error loading configuration from %s: %v", *configFile, err)
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}
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unwrittenSamples := make(chan *extraction.Result, *samplesQueueCapacity)
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ingester := &retrieval.MergeLabelsIngester{
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Labels: conf.GlobalLabels(),
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CollisionPrefix: clientmodel.ExporterLabelPrefix,
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Ingester: retrieval.ChannelIngester(unwrittenSamples),
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}
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targetManager := retrieval.NewTargetManager(ingester)
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targetManager.AddTargetsFromConfig(conf)
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notificationHandler := notification.NewNotificationHandler(*alertmanagerUrl, *notificationQueueCapacity)
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registry.MustRegister(notificationHandler)
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o := &local.MemorySeriesStorageOptions{
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MemoryEvictionInterval: *memoryEvictionInterval,
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MemoryRetentionPeriod: *memoryRetentionPeriod,
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PersistenceStoragePath: *metricsStoragePath,
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PersistencePurgeInterval: *storagePurgeInterval,
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PersistenceRetentionPeriod: *storageRetentionPeriod,
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}
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memStorage, err := local.NewMemorySeriesStorage(o)
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if err != nil {
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glog.Fatal("Error opening memory series storage: ", err)
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}
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registry.MustRegister(memStorage)
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ruleManager := manager.NewRuleManager(&manager.RuleManagerOptions{
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Results: unwrittenSamples,
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NotificationHandler: notificationHandler,
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EvaluationInterval: conf.EvaluationInterval(),
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Storage: memStorage,
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PrometheusUrl: web.MustBuildServerUrl(),
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})
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if err := ruleManager.AddRulesFromConfig(conf); err != nil {
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glog.Fatal("Error loading rule files: ", err)
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}
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var remoteTSDBQueue *remote.TSDBQueueManager
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if *remoteTSDBUrl == "" {
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glog.Warningf("No TSDB URL provided; not sending any samples to long-term storage")
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} else {
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openTSDB := opentsdb.NewClient(*remoteTSDBUrl, *remoteTSDBTimeout)
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remoteTSDBQueue = remote.NewTSDBQueueManager(openTSDB, 512)
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registry.MustRegister(remoteTSDBQueue)
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}
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flags := map[string]string{}
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flag.VisitAll(func(f *flag.Flag) {
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flags[f.Name] = f.Value.String()
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})
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prometheusStatus := &web.PrometheusStatusHandler{
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BuildInfo: BuildInfo,
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Config: conf.String(),
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RuleManager: ruleManager,
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TargetPools: targetManager.Pools(),
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Flags: flags,
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Birth: time.Now(),
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}
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alertsHandler := &web.AlertsHandler{
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RuleManager: ruleManager,
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}
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consolesHandler := &web.ConsolesHandler{
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Storage: memStorage,
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}
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metricsService := &api.MetricsService{
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Config: &conf,
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TargetManager: targetManager,
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Storage: memStorage,
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}
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webService := &web.WebService{
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StatusHandler: prometheusStatus,
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MetricsHandler: metricsService,
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ConsolesHandler: consolesHandler,
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AlertsHandler: alertsHandler,
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}
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p := &prometheus{
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unwrittenSamples: unwrittenSamples,
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ruleManager: ruleManager,
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targetManager: targetManager,
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notificationHandler: notificationHandler,
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storage: memStorage,
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remoteTSDBQueue: remoteTSDBQueue,
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webService: webService,
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}
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webService.QuitDelegate = p.Close
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return p
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}
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// Serve starts the Prometheus server. It returns after the server has been shut
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// down. The method installs an interrupt handler, allowing to trigger a
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// shutdown by sending SIGTERM to the process.
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func (p *prometheus) Serve() {
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if p.remoteTSDBQueue != nil {
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go p.remoteTSDBQueue.Run()
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}
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go p.ruleManager.Run()
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go p.notificationHandler.Run()
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go p.interruptHandler()
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storageStarted := make(chan struct{})
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go p.storage.Serve(storageStarted)
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<-storageStarted
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go func() {
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err := p.webService.ServeForever()
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if err != nil {
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glog.Fatal(err)
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}
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}()
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for block := range p.unwrittenSamples {
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if block.Err == nil && len(block.Samples) > 0 {
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p.storage.AppendSamples(block.Samples)
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if p.remoteTSDBQueue != nil {
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p.remoteTSDBQueue.Queue(block.Samples)
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}
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}
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}
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// The following shut-down operations have to happen after
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// unwrittenSamples is drained. So do not move them into close().
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if err := p.storage.Close(); err != nil {
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glog.Error("Error closing local storage: ", err)
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}
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glog.Info("Local Storage: Done")
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if p.remoteTSDBQueue != nil {
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p.remoteTSDBQueue.Stop()
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glog.Info("Remote Storage: Done")
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}
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p.notificationHandler.Stop()
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glog.Info("Sundry Queues: Done")
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glog.Info("See you next time!")
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}
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// Close cleanly shuts down the Prometheus server.
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func (p *prometheus) Close() {
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p.closeOnce.Do(p.close)
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}
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func (p *prometheus) interruptHandler() {
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notifier := make(chan os.Signal)
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signal.Notify(notifier, os.Interrupt, syscall.SIGTERM)
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<-notifier
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glog.Warning("Received SIGTERM, exiting gracefully...")
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p.Close()
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}
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func (p *prometheus) close() {
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glog.Info("Shutdown has been requested; subsytems are closing:")
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p.targetManager.Stop()
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glog.Info("Remote Target Manager: Done")
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p.ruleManager.Stop()
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glog.Info("Rule Executor: Done")
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close(p.unwrittenSamples)
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// Note: Before closing the remaining subsystems (storage, ...), we have
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// to wait until p.unwrittenSamples is actually drained. Therefore,
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// remaining shut-downs happen in Serve().
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}
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func main() {
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flag.Parse()
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versionInfoTmpl.Execute(os.Stdout, BuildInfo)
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if *printVersion {
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os.Exit(0)
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}
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NewPrometheus().Serve()
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}
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