Add prometheus endpoint for getting metrics (#33)

pkg/red/redis.go

@@ -0,0 +1,52 @@
+//  Vikunja is a todo-list application to facilitate your life.
+//  Copyright 2018 Vikunja and contributors. All rights reserved.
+//
+//  This program is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package red
+
+import (
+	"code.vikunja.io/api/pkg/log"
+	"github.com/go-redis/redis"
+	"github.com/spf13/viper"
+)
+
+var r *redis.Client
+
+// SetRedis initializes a redis connection
+func init() {
+	if !viper.GetBool("redis.enabled") {
+		return
+	}
+
+	if viper.GetString("redis.host") == "" {
+		log.Log.Fatal("No redis host provided.")
+	}
+
+	r = redis.NewClient(&redis.Options{
+		Addr:     viper.GetString("redis.host"),
+		Password: viper.GetString("redis.password"),
+		DB:       viper.GetInt("redis.db"),
+	})
+
+	err := r.Ping().Err()
+	if err != nil {
+		log.Log.Fatal(err.Error())
+	}
+}
+
+// GetRedis returns a pointer to a redis client
+func GetRedis() *redis.Client {
+	return r
+}