From 87960917f61a24867a4384875febff708e7c2546 Mon Sep 17 00:00:00 2001
From: Robert Jacob <xperimental@solidproject.de>
Date: Sun, 21 Jun 2020 15:26:53 +0200
Subject: [PATCH] Add handler for version information

---
 main.go    |  1 +
 version.go | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 version.go

diff --git a/main.go b/main.go
index 61a408d..a12cd62 100644
--- a/main.go
+++ b/main.go
@@ -41,6 +41,7 @@ func main() {
 	prometheus.MustRegister(metrics)
 
 	http.Handle("/metrics", promhttp.HandlerFor(prometheus.DefaultGatherer, promhttp.HandlerOpts{}))
+	http.Handle("/version", versionHandler(log))
 	http.Handle("/", http.RedirectHandler("/metrics", http.StatusFound))
 
 	log.Infof("Listen on %s...", cfg.Addr)
diff --git a/version.go b/version.go
new file mode 100644
index 0000000..75b65fd
--- /dev/null
+++ b/version.go
@@ -0,0 +1,33 @@
+package main
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/sirupsen/logrus"
+)
+
+var (
+	// Version contains the version as set during the build.
+	Version = ""
+
+	// GitCommit contains the git commit hash set during the build.
+	GitCommit = ""
+)
+
+func versionHandler(log logrus.FieldLogger) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		info := struct {
+			Version string `json:"version"`
+			Commit  string `json:"commit"`
+		}{
+			Version: Version,
+			Commit:  GitCommit,
+		}
+
+		w.Header().Add("Content-Type", "application/json")
+		if err := json.NewEncoder(w).Encode(info); err != nil {
+			log.Errorf("Error encoding version info: %s", err)
+		}
+	})
+}