prometheus/main.go

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// Copyright 2013 Prometheus Team
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// 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.
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package main
import (
"flag"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/retrieval"
"github.com/prometheus/prometheus/retrieval/format"
"github.com/prometheus/prometheus/rules"
"github.com/prometheus/prometheus/storage/metric"
"github.com/prometheus/prometheus/web"
"github.com/prometheus/prometheus/web/api"
"log"
"os"
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"os/signal"
"sync"
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"time"
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)
// Commandline flags.
var (
printVersion = flag.Bool("version", false, "print version information")
configFile = flag.String("configFile", "prometheus.conf", "Prometheus configuration file name.")
metricsStoragePath = flag.String("metricsStoragePath", "/tmp/metrics", "Base path for metrics storage.")
scrapeResultsQueueCapacity = flag.Int("scrapeResultsQueueCapacity", 4096, "The size of the scrape results queue.")
ruleResultsQueueCapacity = flag.Int("ruleResultsQueueCapacity", 4096, "The size of the rule results queue.")
concurrentRetrievalAllowance = flag.Int("concurrentRetrievalAllowance", 15, "The number of concurrent metrics retrieval requests allowed.")
diskAppendQueueCapacity = flag.Int("queue.diskAppendCapacity", 1000000, "The size of the queue for items that are pending writing to disk.")
memoryAppendQueueCapacity = flag.Int("queue.memoryAppendCapacity", 10000, "The size of the queue for items that are pending writing to memory.")
headCompactInterval = flag.Duration("compact.headInterval", 10*3*time.Minute, "The amount of time between head compactions.")
bodyCompactInterval = flag.Duration("compact.bodyInterval", 10*5*time.Minute, "The amount of time between body compactions.")
tailCompactInterval = flag.Duration("compact.tailInterval", 10*7*time.Minute, "The amount of time between tail compactions.")
headGroupSize = flag.Int("compact.headGroupSize", 50, "The minimum group size for head samples.")
bodyGroupSize = flag.Int("compact.bodyGroupSize", 250, "The minimum group size for body samples.")
tailGroupSize = flag.Int("compact.tailGroupSize", 5000, "The minimum group size for tail samples.")
headAge = flag.Duration("compact.headAgeInclusiveness", 5*time.Minute, "The relative inclusiveness of head samples.")
bodyAge = flag.Duration("compact.bodyAgeInclusiveness", time.Hour, "The relative inclusiveness of body samples.")
tailAge = flag.Duration("compact.tailAgeInclusiveness", 24*time.Hour, "The relative inclusiveness of tail samples.")
)
type prometheus struct {
headCompactionTimer *time.Ticker
bodyCompactionTimer *time.Ticker
tailCompactionTimer *time.Ticker
compactionMutex sync.Mutex
curationState chan metric.CurationState
stopBackgroundOperations chan bool
ruleResults chan *rules.Result
scrapeResults chan format.Result
storage *metric.TieredStorage
}
func (p *prometheus) interruptHandler() {
notifier := make(chan os.Signal)
signal.Notify(notifier, os.Interrupt)
<-notifier
log.Println("Received SIGINT; Exiting Gracefully...")
p.close()
os.Exit(0)
}
func (p *prometheus) compact(olderThan time.Duration, groupSize int) error {
p.compactionMutex.Lock()
defer p.compactionMutex.Unlock()
processor := &metric.CompactionProcessor{
MaximumMutationPoolBatch: groupSize * 3,
MinimumGroupSize: groupSize,
}
curator := metric.Curator{
Stop: p.stopBackgroundOperations,
}
return curator.Run(olderThan, time.Now(), processor, p.storage.DiskStorage.CurationRemarks, p.storage.DiskStorage.MetricSamples, p.storage.DiskStorage.MetricHighWatermarks, p.curationState)
}
func (p *prometheus) close() {
if p.headCompactionTimer != nil {
p.headCompactionTimer.Stop()
}
if p.bodyCompactionTimer != nil {
p.bodyCompactionTimer.Stop()
}
if p.tailCompactionTimer != nil {
p.tailCompactionTimer.Stop()
}
if len(p.stopBackgroundOperations) == 0 {
p.stopBackgroundOperations <- true
}
p.compactionMutex.Lock()
p.storage.Close()
close(p.stopBackgroundOperations)
close(p.curationState)
}
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func main() {
// TODO(all): Future additions to main should be, where applicable, glumped
// into the prometheus struct above---at least where the scoping of the entire
// server is concerned.
flag.Parse()
versionInfoTmpl.Execute(os.Stdout, BuildInfo)
if *printVersion {
os.Exit(0)
}
conf, err := config.LoadFromFile(*configFile)
if err != nil {
log.Fatalf("Error loading configuration from %s: %v", *configFile, err)
}
ts, err := metric.NewTieredStorage(uint(*memoryAppendQueueCapacity), uint(*diskAppendQueueCapacity), 100, time.Second*30, time.Second*1, time.Second*20, *metricsStoragePath)
if err != nil {
log.Fatalf("Error opening storage: %s", err)
}
if ts == nil {
log.Fatalln("Nil tiered storage.")
}
scrapeResults := make(chan format.Result, *scrapeResultsQueueCapacity)
ruleResults := make(chan *rules.Result, *ruleResultsQueueCapacity)
curationState := make(chan metric.CurationState, 1)
// Coprime numbers, fool!
headCompactionTimer := time.NewTicker(*headCompactInterval)
bodyCompactionTimer := time.NewTicker(*bodyCompactInterval)
tailCompactionTimer := time.NewTicker(*tailCompactInterval)
// Queue depth will need to be exposed
targetManager := retrieval.NewTargetManager(scrapeResults, *concurrentRetrievalAllowance)
targetManager.AddTargetsFromConfig(conf)
statusHandler := &web.StatusHandler{
BuildInfo: BuildInfo,
Config: &conf,
CurationState: curationState,
// Furnish the default status.
PrometheusStatus: &web.PrometheusStatus{},
TargetManager: targetManager,
}
// The closing of curationState implicitly closes this routine.
go statusHandler.ServeRequestsForever()
metricsService := &api.MetricsService{
Config: &conf,
TargetManager: targetManager,
Storage: ts,
}
webService := &web.WebService{
StatusHandler: statusHandler,
MetricsHandler: metricsService,
}
prometheus := prometheus{
bodyCompactionTimer: bodyCompactionTimer,
curationState: curationState,
headCompactionTimer: headCompactionTimer,
ruleResults: ruleResults,
scrapeResults: scrapeResults,
stopBackgroundOperations: make(chan bool, 1),
storage: ts,
tailCompactionTimer: tailCompactionTimer,
}
defer prometheus.close()
go ts.Serve()
go prometheus.interruptHandler()
go func() {
for _ = range prometheus.headCompactionTimer.C {
log.Println("Starting head compaction...")
err := prometheus.compact(*headAge, *headGroupSize)
if err != nil {
log.Printf("could not compact due to %s", err)
}
log.Println("Done")
}
}()
go func() {
for _ = range prometheus.bodyCompactionTimer.C {
log.Println("Starting body compaction...")
err := prometheus.compact(*bodyAge, *bodyGroupSize)
if err != nil {
log.Printf("could not compact due to %s", err)
}
log.Println("Done")
}
}()
go func() {
for _ = range prometheus.tailCompactionTimer.C {
log.Println("Starting tail compaction...")
err := prometheus.compact(*tailAge, *tailGroupSize)
if err != nil {
log.Printf("could not compact due to %s", err)
}
log.Println("Done")
}
}()
// Queue depth will need to be exposed
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ruleManager := rules.NewRuleManager(ruleResults, conf.EvaluationInterval(), ts)
err = ruleManager.AddRulesFromConfig(conf)
if err != nil {
log.Fatalf("Error loading rule files: %v", err)
}
go func() {
err := webService.ServeForever()
if err != nil {
log.Fatal(err)
}
}()
// TODO(all): Migrate this into prometheus.serve().
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for {
select {
case scrapeResult := <-scrapeResults:
if scrapeResult.Err == nil {
ts.AppendSamples(scrapeResult.Samples)
}
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case ruleResult := <-ruleResults:
if ruleResult.Err == nil {
ts.AppendSamples(ruleResult.Samples)
}
}
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}
}