code refactor and add unit tests

pkg/cron/cron_job_period.go

@@ -0,0 +1,63 @@
+package cron
+
+import (
+	"time"
+
+	"github.com/go-co-op/gocron/v2"
+)
+
+// CronJobPeriod represents the cron job period
+type CronJobPeriod interface {
+	GetInterval() time.Duration
+	ToJobDefinition() gocron.JobDefinition
+}
+
+// CronJobIntervalPeriod represents the period of execution at intervals
+type CronJobIntervalPeriod struct {
+	Interval time.Duration
+}
+
+// CronJobFixedHourPeriod represents the period of execution at fixed hour
+type CronJobFixedHourPeriod struct {
+	Hour uint32
+}
+
+// CronJobFixedTimePeriod represents the period of execution at fixed time
+type CronJobFixedTimePeriod struct {
+	Time time.Time
+}
+
+// GetInterval returns the interval time of the period of CronJobIntervalPeriod
+func (p CronJobIntervalPeriod) GetInterval() time.Duration {
+	return p.Interval
+}
+
+// ToJobDefinition returns the gocron job definition of the period of CronJobIntervalPeriod
+func (p CronJobIntervalPeriod) ToJobDefinition() gocron.JobDefinition {
+	return gocron.DurationJob(p.Interval)
+}
+
+// GetInterval returns the interval time of the period of CronJobFixedHourPeriod
+func (p CronJobFixedHourPeriod) GetInterval() time.Duration {
+	return 24 * time.Hour
+}
+
+// ToJobDefinition returns the gocron job definition of the period of CronJobFixedHourPeriod
+func (p CronJobFixedHourPeriod) ToJobDefinition() gocron.JobDefinition {
+	return gocron.DailyJob(
+		1,
+		gocron.NewAtTimes(
+			gocron.NewAtTime(uint(p.Hour), 0, 0),
+		),
+	)
+}
+
+// GetInterval returns the interval time of the period of CronJobFixedTimePeriod
+func (p CronJobFixedTimePeriod) GetInterval() time.Duration {
+	return 0
+}
+
+// ToJobDefinition returns the gocron job definition of the period of CronJobFixedTimePeriod
+func (p CronJobFixedTimePeriod) ToJobDefinition() gocron.JobDefinition {
+	return gocron.OneTimeJob(gocron.OneTimeJobStartDateTime(p.Time))
+}