Multiple fixes

collector/exporter.go

@@ -42,7 +42,7 @@ var (
 // Verify if Exporter implements prometheus.Collector
 var _ prometheus.Collector = (*Exporter)(nil)
 
-// Exporter collects MySQL metrics. It implements prometheus.Collector.
+// Exporter collects PostgreSQL metrics. It implements prometheus.Collector.
 type Exporter struct {
 	ctx       context.Context
 	dsn       string
@@ -89,6 +89,7 @@ func (e *Exporter) scrape(ctx context.Context, ch chan<- prometheus.Metric) {
 	sqldb := sql.OpenDB(pgconn)
 	// Only use one connection
 	sqldb.SetMaxOpenConns(1)
+	defer sqldb.Close()
 	db := bun.NewDB(sqldb, pgdialect.New())
 
 	// get the database version
@@ -164,6 +165,7 @@ func (e *Exporter) scrape(ctx context.Context, ch chan<- prometheus.Metric) {
 		localsqldb := sql.OpenDB(localconn)
 		// Only use one connection
 		localsqldb.SetMaxOpenConns(1)
+		defer localsqldb.Close()
 		localdb := bun.NewDB(localsqldb, pgdialect.New())
 
 		for _, scraper := range e.scrapers {

go.mod

@@ -18,7 +18,7 @@ require (
 
 require (
 	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
-	github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d // indirect
+	github.com/alecthomas/units v0.0.0-20211218093645-b94a6e3cc137 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.1.2 // indirect
 	github.com/go-logfmt/logfmt v0.6.0 // indirect
@@ -31,6 +31,7 @@ require (
 	github.com/prometheus/client_model v0.3.0 // indirect
 	github.com/prometheus/procfs v0.8.0 // indirect
 	github.com/spf13/pflag v1.0.3 // indirect
+	github.com/stretchr/testify v1.8.2 // indirect
 	github.com/tmthrgd/go-hex v0.0.0-20190904060850-447a3041c3bc // indirect
 	github.com/vmihailenco/msgpack/v5 v5.3.5 // indirect
 	github.com/vmihailenco/tagparser/v2 v2.0.0 // indirect

go.sum

@@ -1,7 +1,7 @@
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 h1:JYp7IbQjafoB+tBA3gMyHYHrpOtNuDiK/uB5uXxq5wM=
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
-github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d h1:UQZhZ2O0vMHr2cI+DC1Mbh0TJxzA3RcLoMsFw+aXw7E=
-github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
+github.com/alecthomas/units v0.0.0-20211218093645-b94a6e3cc137 h1:s6gZFSlWYmbqAuRjVTiNNhvNRfY2Wxp9nhfyel4rklc=
+github.com/alecthomas/units v0.0.0-20211218093645-b94a6e3cc137/go.mod h1:OMCwj8VM1Kc9e19TLln2VL61YJF0x1XFtfdL4JdbSyE=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/cespare/xxhash/v2 v2.1.2 h1:YRXhKfTDauu4ajMg1TPgFO5jnlC2HCbmLXMcTG5cbYE=
@@ -48,10 +48,15 @@ github.com/prometheus/procfs v0.8.0/go.mod h1:z7EfXMXOkbkqb9IINtpCn86r/to3BnA0ua
 github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
 github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
+github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
+github.com/stretchr/testify v1.8.2 h1:+h33VjcLVPDHtOdpUCuF+7gSuG3yGIftsP1YvFihtJ8=
+github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/tmthrgd/go-hex v0.0.0-20190904060850-447a3041c3bc h1:9lRDQMhESg+zvGYmW5DyG0UqvY96Bu5QYsTLvCHdrgo=
 github.com/tmthrgd/go-hex v0.0.0-20190904060850-447a3041c3bc/go.mod h1:bciPuU6GHm1iF1pBvUfxfsH0Wmnc2VbpgvbI9ZWuIRs=
 github.com/uptrace/bun v1.1.12 h1:sOjDVHxNTuM6dNGaba0wUuz7KvDE1BmNu9Gqs2gJSXQ=
@@ -104,6 +109,7 @@ gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 k8s.io/gengo v0.0.0-20190907103519-ebc107f98eab h1:j4L8spMe0tFfBvvW6lrc0c+Ql8+nnkcV3RYfi3eSwGY=
 k8s.io/gengo v0.0.0-20190907103519-ebc107f98eab/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
 k8s.io/klog v0.4.0 h1:lCJCxf/LIowc2IGS9TPjWDyXY4nOmdGdfcwwDQCOURQ=

pg_exporter.go

@@ -12,19 +12,19 @@ import (
 	"strings"
 	"time"
 
+	"github.com/go-kit/log"
 	"github.com/go-kit/log/level"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/prometheus/common/promlog"
+	"github.com/prometheus/common/promlog/flag"
 	"github.com/prometheus/common/version"
 	"github.com/uptrace/bun/driver/pgdriver"
 	"gopkg.in/alecthomas/kingpin.v2"
 
 	"github.com/1and1/pg-exporter/collector"
 )
 
-var log = promlog.NewDynamic(&promlog.Config{})
-
 var (
 	listenAddress = kingpin.Flag(
 		"web.listen-address",
@@ -64,7 +64,7 @@ func init() {
 	prometheus.MustRegister(version.NewCollector("pg_exporter"))
 }
 
-func newHandler(metrics collector.Metrics, scrapers []collector.Scraper) http.HandlerFunc {
+func newHandler(metrics collector.Metrics, scrapers []collector.Scraper, logger log.Logger) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		filteredScrapers := scrapers
 		params := r.URL.Query()["collect[]"]
@@ -74,15 +74,11 @@ func newHandler(metrics collector.Metrics, scrapers []collector.Scraper) http.Ha
 		if v := r.Header.Get("X-Prometheus-Scrape-Timeout-Seconds"); v != "" {
 			timeoutSeconds, err := strconv.ParseFloat(v, 64)
 			if err != nil {
-				level.Error(log).Log("Failed to parse timeout from Prometheus header: %s", err)
+				level.Error(logger).Log("msg", "Failed to parse timeout from Prometheus header", "err", err)
 			} else {
 				if *timeoutOffset >= timeoutSeconds {
 					// Ignore timeout offset if it doesn't leave time to scrape.
-					level.Error(log).Log(
-						"Timeout offset (--timeout-offset=%.2f) should be lower than prometheus scrape time (X-Prometheus-Scrape-Timeout-Seconds=%.2f).",
-						*timeoutOffset,
-						timeoutSeconds,
-					)
+					level.Error(logger).Log("msg", "Timeout offset should be lower than prometheus scrape timeout", "offset", *timeoutOffset, "prometheus_scrape_timeout", timeoutSeconds)
 				} else {
 					// Subtract timeout offset from timeout.
 					timeoutSeconds -= *timeoutOffset
@@ -95,7 +91,6 @@ func newHandler(metrics collector.Metrics, scrapers []collector.Scraper) http.Ha
 				r = r.WithContext(ctx)
 			}
 		}
-		level.Debug(log).Log("collect query:", params)
 
 		// Check if we have some "collect[]" query parameters.
 		if len(params) > 0 {
@@ -144,10 +139,12 @@ func main() {
 	}
 
 	// Parse flags.
-	// log.AddFlags(kingpin.CommandLine)
+	promlogConfig := &promlog.Config{}
+	flag.AddFlags(kingpin.CommandLine, promlogConfig)
 	kingpin.Version(version.Print("pg_exporter"))
 	kingpin.HelpFlag.Short('h')
 	kingpin.Parse()
+	logger := promlog.New(promlogConfig)
 
 	// landingPage contains the HTML served at '/'.
 	// TODO: Make this nicer and more informative.
@@ -160,8 +157,8 @@ func main() {
 </html>
 `)
 
-	level.Info(log).Log("Starting pg_exporter", version.Info())
-	level.Info(log).Log("Build context", version.BuildContext())
+	level.Info(logger).Log("Starting pg_exporter", version.Info())
+	level.Info(logger).Log("Build context", version.BuildContext())
 
 	// if we have a dsn, we use this for the connection
 	if dsn := os.Getenv("DATA_SOURCE_NAME"); dsn != "" {
@@ -186,20 +183,19 @@ func main() {
 		}
 	}
 	// Register only scrapers enabled by flag.
-	level.Info(log).Log("Enabled scrapers:")
 	enabledScrapers := []collector.Scraper{}
 	for scraper, enabled := range scraperFlags {
 		if *enabled {
-			level.Info(log).Log(" --collect.%s", scraper.Name())
+			level.Info(logger).Log("msg", "Scraper enabled", "scraper", scraper.Name())
 			enabledScrapers = append(enabledScrapers, scraper)
 		}
 	}
-	handlerFunc := newHandler(collector.NewMetrics(), enabledScrapers)
+	handlerFunc := newHandler(collector.NewMetrics(), enabledScrapers, logger)
 	http.Handle(*metricPath, promhttp.InstrumentMetricHandler(prometheus.DefaultRegisterer, handlerFunc))
 	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 		w.Write(landingPage)
 	})
 
-	level.Info(log).Log("Listening on ", *listenAddress)
-	level.Info(log).Log(http.ListenAndServe(*listenAddress, nil))
+	level.Info(logger).Log("msg", "Listening on", "address", *listenAddress)
+	level.Info(logger).Log(http.ListenAndServe(*listenAddress, nil))
 }