Add cron

go.mod

@@ -61,6 +61,7 @@ require (
 	github.com/pquerna/cachecontrol v0.0.0-20200921180117-858c6e7e6b7e // indirect
 	github.com/pquerna/otp v1.3.0
 	github.com/prometheus/client_golang v1.9.0
+	github.com/robfig/cron/v3 v3.0.1
 	github.com/samedi/caldav-go v3.0.0+incompatible
 	github.com/shurcooL/httpfs v0.0.0-20190707220628-8d4bc4ba7749
 	github.com/shurcooL/vfsgen v0.0.0-20200824052919-0d455de96546

go.sum

@@ -673,6 +673,8 @@ github.com/prometheus/procfs v0.2.0 h1:wH4vA7pcjKuZzjF7lM8awk4fnuJO6idemZXoKnULU
 github.com/prometheus/procfs v0.2.0/go.mod h1:lV6e/gmhEcM9IjHGsFOCxxuZ+z1YqCvr4OA4YeYWdaU=
 github.com/prometheus/tsdb v0.7.1/go.mod h1:qhTCs0VvXwvX/y3TZrWD7rabWM+ijKTux40TwIPHuXU=
 github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4=
+github.com/robfig/cron/v3 v3.0.1 h1:WdRxkvbJztn8LMz/QEvLN5sBU+xKpSqwwUO1Pjr4qDs=
+github.com/robfig/cron/v3 v3.0.1/go.mod h1:eQICP3HwyT7UooqI/z+Ov+PtYAWygg1TEWWzGIFLtro=
 github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
 github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=

pkg/cmd/web.go

@@ -17,6 +17,7 @@
 package cmd
 
 import (
+	"code.vikunja.io/api/pkg/cron"
 	"context"
 	"os"
 	"os/signal"
@@ -70,5 +71,6 @@ var webCmd = &cobra.Command{
 		if err := e.Shutdown(ctx); err != nil {
 			e.Logger.Fatal(err)
 		}
+		cron.Stop()
 	},
 }

pkg/cron/cron.go

@@ -0,0 +1,37 @@
+// Vikunja is a to-do list application to facilitate your life.
+// Copyright 2018-2020 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 cron
+
+import "github.com/robfig/cron/v3"
+
+var c *cron.Cron
+
+// Init starts the cron
+func Init() {
+	c = cron.New()
+}
+
+// Schedule schedules a job as a cron job
+func Schedule(schedule string, f func()) (err error) {
+	_, err = c.AddFunc(schedule, f)
+	return
+}
+
+// Stop stops the cron scheduler
+func Stop() {
+	c.Stop()
+}

pkg/initialize/init.go

@@ -18,6 +18,7 @@ package initialize
 
 import (
 	"code.vikunja.io/api/pkg/config"
+	"code.vikunja.io/api/pkg/cron"
 	"code.vikunja.io/api/pkg/files"
 	"code.vikunja.io/api/pkg/log"
 	"code.vikunja.io/api/pkg/mail"
@@ -80,4 +81,7 @@ func FullInit() {
 
 	// Start the mail daemon
 	mail.StartMailDaemon()
+
+	// Start the cron
+	cron.Init()
 }