mirror of
https://github.com/prometheus/prometheus.git
synced 2024-11-10 07:34:04 -08:00
103 lines
3.3 KiB
Go
103 lines
3.3 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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"code.google.com/p/gorest"
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"flag"
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"github.com/prometheus/client_golang"
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"github.com/prometheus/prometheus/api"
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"github.com/prometheus/prometheus/config"
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"github.com/prometheus/prometheus/retrieval"
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"github.com/prometheus/prometheus/retrieval/format"
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"github.com/prometheus/prometheus/rules"
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"github.com/prometheus/prometheus/rules/ast"
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"github.com/prometheus/prometheus/storage/metric/leveldb"
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"log"
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"net/http"
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_ "net/http/pprof"
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"os"
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"os/signal"
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)
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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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scrapeResultsQueueCapacity = flag.Int("scrapeResultsQueueCapacity", 4096, "The size of the scrape results queue.")
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ruleResultsQueueCapacity = flag.Int("ruleResultsQueueCapacity", 4096, "The size of the rule results queue.")
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concurrentRetrievalAllowance = flag.Int("concurrentRetrievalAllowance", 15, "The number of concurrent metrics retrieval requests allowed.")
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)
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func main() {
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flag.Parse()
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conf, err := config.LoadFromFile(*configFile)
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if err != nil {
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log.Fatalf("Error loading configuration from %s: %v", *configFile, err)
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}
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persistence, err := leveldb.NewLevelDBMetricPersistence(*metricsStoragePath)
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if err != nil {
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log.Fatalf("Error opening storage: %v", err)
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}
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go func() {
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notifier := make(chan os.Signal)
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signal.Notify(notifier, os.Interrupt)
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<-notifier
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persistence.Close()
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os.Exit(0)
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}()
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defer persistence.Close()
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// Queue depth will need to be exposed
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scrapeResults := make(chan format.Result, *scrapeResultsQueueCapacity)
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targetManager := retrieval.NewTargetManager(scrapeResults, *concurrentRetrievalAllowance)
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targetManager.AddTargetsFromConfig(conf)
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ruleResults := make(chan *rules.Result, *ruleResultsQueueCapacity)
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ast.SetPersistence(persistence, nil)
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ruleManager := rules.NewRuleManager(ruleResults, conf.Global.EvaluationInterval)
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err = ruleManager.AddRulesFromConfig(conf)
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if err != nil {
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log.Fatalf("Error loading rule files: %v", err)
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}
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go func() {
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gorest.RegisterService(api.NewMetricsService(persistence))
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exporter := registry.DefaultRegistry.YieldExporter()
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http.Handle("/", gorest.Handle())
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http.Handle("/metrics.json", exporter)
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http.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir("static"))))
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http.ListenAndServe(":9090", nil)
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}()
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for {
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select {
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case scrapeResult := <-scrapeResults:
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if scrapeResult.Err == nil {
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persistence.AppendSample(&scrapeResult.Sample)
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}
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case ruleResult := <-ruleResults:
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for _, sample := range ruleResult.Samples {
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persistence.AppendSample(sample)
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}
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}
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}
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}
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