fix bugs; move to gocron for scheduled jobs

internal/utils/scheduler.go

@@ -0,0 +1,74 @@
+package utils
+
+import (
+	"context"
+	"fmt"
+	"github.com/go-co-op/gocron/v2"
+	"strconv"
+	"strings"
+	"time"
+)
+
+func ScheduleJob(ctx context.Context, interval string, loc *time.Location, jobFunc func()) (gocron.Job, error) {
+	if loc == nil {
+		loc = time.Local
+	}
+	var job gocron.Job
+	s, err := gocron.NewScheduler(gocron.WithLocation(loc))
+	if err != nil {
+		return job, fmt.Errorf("failed to create scheduler: %w", err)
+	}
+	jd, err := convertToJD(interval)
+	if err != nil {
+		return job, fmt.Errorf("failed to convert interval to job definition: %w", err)
+	}
+	// Schedule the job
+	if job, err = s.NewJob(jd, gocron.NewTask(jobFunc), gocron.WithContext(ctx)); err != nil {
+		return job, fmt.Errorf("failed to create job: %w", err)
+	}
+	s.Start()
+	return job, nil
+}
+
+// ConvertToJobDef converts a string interval to a gocron.JobDefinition.
+func convertToJD(interval string) (gocron.JobDefinition, error) {
+	// Parse the interval string
+	// Interval could be in the format "1h", "30m", "15s" or "1h30m" or "04:05"
+	var jd gocron.JobDefinition
+
+	if t, ok := parseClockTime(interval); ok {
+		return gocron.DailyJob(1, gocron.NewAtTimes(
+			gocron.NewAtTime(uint(t.Hour()), uint(t.Minute()), uint(t.Second())),
+		)), nil
+	} else {
+		dur, err := time.ParseDuration(interval)
+		if err != nil {
+			return jd, fmt.Errorf("failed to parse duration: %w", err)
+		}
+		jd = gocron.DurationJob(dur)
+	}
+	return jd, nil
+}
+
+func parseClockTime(s string) (time.Time, bool) {
+	parts := strings.Split(s, ":")
+	if len(parts) != 2 {
+		return time.Time{}, false
+	}
+	h, err := strconv.Atoi(parts[0])
+	if err != nil || h < 0 || h > 23 {
+		return time.Time{}, false
+	}
+	m, err := strconv.Atoi(parts[1])
+	if err != nil || m < 0 || m > 59 {
+		return time.Time{}, false
+	}
+	now := time.Now()
+	// build a time.Time for today at h:m:00 in the local zone
+	t := time.Date(
+		now.Year(), now.Month(), now.Day(),
+		h, m, 0, 0,
+		time.Local,
+	)
+	return t, true
+}