Feature/glob support

README.md

@@ -12,8 +12,9 @@ As it is not uncommon to run multiple instances of OpenVPN on a single
 system (e.g., multiple servers, multiple clients or a mixture of both),
 this exporter can be configured to scrape and export the status of
 multiple status files, using the `-openvpn.status_paths` command line
-flag. Paths need to be comma separated. Metrics for all status files are
-exported over TCP port 9176.
+flag. Paths or [globs](https://en.wikipedia.org/wiki/Glob_(programming))
+need to be comma separated. Metrics for all status files are exported
+over TCP port 9176.
 
 Please refer to this utility's `main()` function for a full list of
 supported command line flags.

exporters/openvpn_exporter.go

@@ -7,6 +7,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 	"io"
 	"log"
+	"path/filepath"
 	"os"
 	"strconv"
 	"strings"
@@ -343,21 +344,28 @@ func (e *OpenVPNExporter) Describe(ch chan<- *prometheus.Desc) {
 }
 
 func (e *OpenVPNExporter) Collect(ch chan<- prometheus.Metric) {
-	for _, statusPath := range e.statusPaths {
-		err := e.collectStatusFromFile(statusPath, ch)
-		if err == nil {
-			ch <- prometheus.MustNewConstMetric(
-				e.openvpnUpDesc,
-				prometheus.GaugeValue,
-				1.0,
-				statusPath)
-		} else {
-			log.Printf("Failed to scrape showq socket: %s", err)
-			ch <- prometheus.MustNewConstMetric(
-				e.openvpnUpDesc,
-				prometheus.GaugeValue,
-				0.0,
-				statusPath)
+	for _, statusPathGlob := range e.statusPaths {
+		matches, err := filepath.Glob(statusPathGlob)
+		if err != nil {
+			log.Printf("Glob failed on %v: %v", statusPathGlob, err)
+			continue
+		}
+		for _, statusPath := range matches {
+			err := e.collectStatusFromFile(statusPath, ch)
+			if err == nil {
+				ch <- prometheus.MustNewConstMetric(
+					e.openvpnUpDesc,
+					prometheus.GaugeValue,
+					1.0,
+					statusPath)
+			} else {
+				log.Printf("Failed to scrape showq socket: %s", err)
+				ch <- prometheus.MustNewConstMetric(
+					e.openvpnUpDesc,
+					prometheus.GaugeValue,
+					0.0,
+					statusPath)
+			}
 		}
 	}
 }