Update cron package to v3

This commit updates cron package version to v3 and uses github.com/robfig/cron/v3
instead of gopkg.in/robfig/cron.v2

Signed-off-by: Vivek Singh <[email protected]>

Author: viveksyngh

go.mod

@@ -8,5 +8,6 @@ require (
 	github.com/openfaas/faas v0.0.0-20190104165101-a65df4795bc6
 	github.com/openfaas/faas-provider v0.0.0-20181216160432-220324e98f5d // indirect
 	github.com/pkg/errors v0.8.1
-	gopkg.in/robfig/cron.v2 v2.0.0-20150107220207-be2e0b0deed5
+	github.com/robfig/cron/v3 v3.0.0
+	gopkg.in/robfig/cron.v2 v2.0.0-20150107220207-be2e0b0deed5 // indirect
 )

go.sum

@@ -6,6 +6,9 @@ github.com/openfaas/faas v0.0.0-20190104165101-a65df4795bc6 h1:eCf/7VwjpIOfLecWQ
 github.com/openfaas/faas v0.0.0-20190104165101-a65df4795bc6/go.mod h1:E0m2rLup0Vvxg53BKxGgaYAGcZa3Xl+vvL7vSi5yQ14=
 github.com/openfaas/faas-provider v0.0.0-20181216160432-220324e98f5d h1:mPAUhyVGlBfGVQQUngtyGEH9uidFUzq9R5QkrpqGJug=
 github.com/openfaas/faas-provider v0.0.0-20181216160432-220324e98f5d/go.mod h1:W4OIp33RUOpR7wW+omJB/7GhIydRmYXvKf/VqUKI4yM=
+github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/robfig/cron/v3 v3.0.0 h1:kQ6Cb7aHOHTSzNVNEhmp8EcWKLb4CbiMW9h9VyIhO4E=
+github.com/robfig/cron/v3 v3.0.0/go.mod h1:eQICP3HwyT7UooqI/z+Ov+PtYAWygg1TEWWzGIFLtro=
 gopkg.in/robfig/cron.v2 v2.0.0-20150107220207-be2e0b0deed5 h1:E846t8CnR+lv5nE+VuiKTDG/v1U2stad0QzddfJC7kY=
 gopkg.in/robfig/cron.v2 v2.0.0-20150107220207-be2e0b0deed5/go.mod h1:hiOFpYm0ZJbusNj2ywpbrXowU3G8U6GIQzqn2mw1UIE=

types/scheduler.go

@@ -8,12 +8,16 @@ import (
 	"log"
 
 	"github.com/openfaas-incubator/connector-sdk/types"
-	"gopkg.in/robfig/cron.v2"
+	cron "github.com/robfig/cron/v3"
 )
 
 // EntryID type redifined for this package
 type EntryID cron.EntryID
 
+var standardParser = cron.NewParser(
+	cron.Minute | cron.Hour | cron.Dom | cron.Month | cron.Dow | cron.Descriptor,
+)
+
 // Scheduler is an interface which talks with cron scheduler
 type Scheduler struct {
 	main *cron.Cron
@@ -44,7 +48,7 @@ func (s *Scheduler) AddCronFunction(c CronFunction, invoker *types.Invoker) (Sch
 // NewScheduler returns a scheduler
 func NewScheduler() *Scheduler {
 	return &Scheduler{
-		cron.New(),
+		cron.New(cron.WithParser(standardParser)),
 	}
 }
 
@@ -60,7 +64,7 @@ func (s *Scheduler) Remove(function ScheduledFunction) {
 
 // CheckSchedule returns true if the schedule string is compliant with cron
 func CheckSchedule(schedule string) bool {
-	_, err := cron.Parse(schedule)
+	_, err := standardParser.Parse(schedule)
 	return err == nil
 }