support scheduled transaction (#2)

pkg/cron/cron_job_period.go

@@ -1,6 +1,7 @@
 package cron
 
 import (
+	"fmt"
 	"time"
 
 	"github.com/go-co-op/gocron/v2"
@@ -22,6 +23,11 @@ type CronJobFixedHourPeriod struct {
 	Hour uint32
 }
 
+// CronJobEvery15MinutesPeriod represents the period of execution at every 15 minutes
+type CronJobEvery15MinutesPeriod struct {
+	Second uint32
+}
+
 // CronJobFixedTimePeriod represents the period of execution at fixed time
 type CronJobFixedTimePeriod struct {
 	Time time.Time
@@ -52,6 +58,16 @@ func (p CronJobFixedHourPeriod) ToJobDefinition() gocron.JobDefinition {
 	)
 }
 
+// GetInterval returns the interval time of the period of CronJobEvery15MinutesPeriod
+func (p CronJobEvery15MinutesPeriod) GetInterval() time.Duration {
+	return 15 * time.Minute
+}
+
+// ToJobDefinition returns the gocron job definition of the period of CronJobEvery15MinutesPeriod
+func (p CronJobEvery15MinutesPeriod) ToJobDefinition() gocron.JobDefinition {
+	return gocron.CronJob(fmt.Sprintf("%d */15 * * * *", p.Second), true)
+}
+
 // GetInterval returns the interval time of the period of CronJobFixedTimePeriod
 func (p CronJobFixedTimePeriod) GetInterval() time.Duration {
 	return 0