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// Copyright 2021 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.
package main
import (
"fmt"
"net/http"
"os"
"strings"
"github.com/prometheus-community/postgres_exporter/collector"
"github.com/prometheus-community/postgres_exporter/config"
"github.com/prometheus/client_golang/prometheus"
versioncollector "github.com/prometheus/client_golang/prometheus/collectors/version"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/promslog"
"github.com/prometheus/common/promslog/flag"
"github.com/prometheus/common/version"
"github.com/prometheus/exporter-toolkit/web"
"github.com/prometheus/exporter-toolkit/web/kingpinflag"
"gopkg.in/alecthomas/kingpin.v2"
)
var (
c = config.Handler{
Config: &config.Config{},
}
configFile = kingpin.Flag("config.file", "Postgres exporter configuration file.").Default("postgres_exporter.yml").String()
webConfig = kingpinflag.AddFlags(kingpin.CommandLine, ":9187")
metricsPath = kingpin.Flag("web.telemetry-path", "Path under which to expose metrics.").Default("/metrics").Envar("PG_EXPORTER_WEB_TELEMETRY_PATH").String()
disableDefaultMetrics = kingpin.Flag("disable-default-metrics", "Do not include default metrics.").Default("false").Envar("PG_EXPORTER_DISABLE_DEFAULT_METRICS").Bool()
disableSettingsMetrics = kingpin.Flag("disable-settings-metrics", "Do not include pg_settings metrics.").Default("false").Envar("PG_EXPORTER_DISABLE_SETTINGS_METRICS").Bool()
autoDiscoverDatabases = kingpin.Flag("auto-discover-databases", "Whether to discover the databases on a server dynamically. (DEPRECATED)").Default("false").Envar("PG_EXPORTER_AUTO_DISCOVER_DATABASES").Bool()
queriesPath = kingpin.Flag("extend.query-path", "Path to custom queries to run. (DEPRECATED)").Default("").Envar("PG_EXPORTER_EXTEND_QUERY_PATH").String()
onlyDumpMaps = kingpin.Flag("dumpmaps", "Do not run, simply dump the maps.").Bool()
constantLabelsList = kingpin.Flag("constantLabels", "A list of label=value separated by comma(,). (DEPRECATED)").Default("").Envar("PG_EXPORTER_CONSTANT_LABELS").String()
excludeDatabases = kingpin.Flag("exclude-databases", "A list of databases to remove when autoDiscoverDatabases is enabled (DEPRECATED)").Default("").Envar("PG_EXPORTER_EXCLUDE_DATABASES").String()
includeDatabases = kingpin.Flag("include-databases", "A list of databases to include when autoDiscoverDatabases is enabled (DEPRECATED)").Default("").Envar("PG_EXPORTER_INCLUDE_DATABASES").String()
metricPrefix = kingpin.Flag("metric-prefix", "A metric prefix can be used to have non-default (not \"pg\") prefixes for each of the metrics").Default("pg").Envar("PG_EXPORTER_METRIC_PREFIX").String()
logger = promslog.NewNopLogger()
)
// Metric name parts.
const (
// Namespace for all metrics.
namespace = "pg"
// Subsystems.
exporter = "exporter"
// The name of the exporter.
exporterName = "postgres_exporter"
// Metric label used for static string data thats handy to send to Prometheus
// e.g. version
staticLabelName = "static"
// Metric label used for server identification.
serverLabelName = "server"
)
func main() {
kingpin.Version(version.Print(exporterName))
promslogConfig := &promslog.Config{}
flag.AddFlags(kingpin.CommandLine, promslogConfig)
kingpin.HelpFlag.Short('h')
kingpin.Parse()
logger = promslog.New(promslogConfig)
if *onlyDumpMaps {
dumpMaps()
return
}
if err := c.ReloadConfig(*configFile, logger); err != nil {
// This is not fatal, but it means that auth must be provided for every dsn.
logger.Warn("Error loading config", "err", err)
}
dsns, err := getDataSources()
if err != nil {
logger.Error("Failed reading data sources", "err", err.Error())
os.Exit(1)
}
excludedDatabases := strings.Split(*excludeDatabases, ",")
logger.Info("Excluded databases", "databases", fmt.Sprintf("%v", excludedDatabases))
if *queriesPath != "" {
logger.Warn("The extended queries.yaml config is DEPRECATED", "file", *queriesPath)
}
if *autoDiscoverDatabases || *excludeDatabases != "" || *includeDatabases != "" {
logger.Warn("Scraping additional databases via auto discovery is DEPRECATED")
}
if *constantLabelsList != "" {
logger.Warn("Constant labels on all metrics is DEPRECATED")
}
opts := []ExporterOpt{
DisableDefaultMetrics(*disableDefaultMetrics),
DisableSettingsMetrics(*disableSettingsMetrics),
AutoDiscoverDatabases(*autoDiscoverDatabases),
WithUserQueriesPath(*queriesPath),
WithConstantLabels(*constantLabelsList),
ExcludeDatabases(excludedDatabases),
IncludeDatabases(*includeDatabases),
}
exporter := NewExporter(dsns, opts...)
defer func() {
exporter.servers.Close()
}()
prometheus.MustRegister(versioncollector.NewCollector(exporterName))
prometheus.MustRegister(exporter)
// TODO(@sysadmind): Remove this with multi-target support. We are removing multiple DSN support
dsn := ""
if len(dsns) > 0 {
dsn = dsns[0]
}
pe, err := collector.NewPostgresCollector(
logger,
excludedDatabases,
dsn,
[]string{},
)
if err != nil {
logger.Warn("Failed to create PostgresCollector", "err", err.Error())
} else {
prometheus.MustRegister(pe)
}
http.Handle(*metricsPath, promhttp.Handler())
if *metricsPath != "/" && *metricsPath != "" {
landingConfig := web.LandingConfig{
Name: "Postgres Exporter",
Description: "Prometheus PostgreSQL server Exporter",
Version: version.Info(),
Links: []web.LandingLinks{
{
Address: *metricsPath,
Text: "Metrics",
},
},
}
landingPage, err := web.NewLandingPage(landingConfig)
if err != nil {
logger.Error("error creating landing page", "err", err)
os.Exit(1)
}
http.Handle("/", landingPage)
}
http.HandleFunc("/probe", handleProbe(logger, excludedDatabases))
srv := &http.Server{}
if err := web.ListenAndServe(srv, webConfig, logger); err != nil {
logger.Error("Error running HTTP server", "err", err)
os.Exit(1)
}
}
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