功能：添加缓存功能以改善核心部分中的假日数据检索

- 添加一个新文件'cache.go'
- 在'core.go'中将函数'GetHolidaysData'更改为'GetHolidaysDataWithCache'
- 添加一个缓存结构和相关函数到'core.go'，用于缓存假日数据
- 在'core.go'中添加一个函数'jsonEncode'，用于编码JSON数据。

Signed-off-by: u <u@a.com>

cache.go

@@ -0,0 +1,24 @@
+package time_arrow
+
+import "time"
+
+type cache struct {
+	Expired time.Time
+	Data    string
+}
+
+func (c *cache) IsExpired() bool {
+	return c.Expired.Before(time.Now())
+}
+
+func (c *cache) SetData(data string, duration time.Duration) {
+	c.Data = data
+	c.Expired = time.Now().Add(duration)
+}
+
+func (c *cache) GetData() string {
+	if c.IsExpired() {
+		return ""
+	}
+	return c.Data
+}

core.go

@@ -1,6 +1,7 @@
 package time_arrow
 
 import (
+	"encoding/json"
 	"fmt"
 	"log"
 	"sort"
@@ -236,7 +237,7 @@ func isInTimeOfDay2(t time.Time, ta TimeArrow) bool {
 }
 
 func isInHolidays(t time.Time) bool {
-	holidaysData, err := GetHolidaysData()
+	holidaysData, err := GetHolidaysDataWithCache()
 	if err != nil {
 		return false
 	}
@@ -253,7 +254,7 @@ func isInHolidays(t time.Time) bool {
 
 func isInAtLastDayHolidays(t time.Time) bool {
 	t = t.Local()
-	holidaysData, err := GetHolidaysData()
+	holidaysData, err := GetHolidaysDataWithCache()
 	if err != nil {
 		return false
 	}
@@ -277,7 +278,7 @@ func isInAtLastDayHolidays(t time.Time) bool {
 }
 
 func isInPriorToDayHolidays(t time.Time) bool {
-	holidaysData, err := GetHolidaysData()
+	holidaysData, err := GetHolidaysDataWithCache()
 	if err != nil {
 		return false
 	}
@@ -320,7 +321,7 @@ func createUUID() string {
 	return uid.String()
 }
 
-//CreateDayOfWeekTypePlan 创建一个每周计划
+// CreateDayOfWeekTypePlan 创建一个每周计划
 func CreateDayOfWeekTypePlan(group string, dayOfWeek []int, timesOnDay []string, expandValue interface{}, expandTags []string, weights float64) TimeArrow {
 	return TimeArrow{
 		TimeArrowId: createUUID(),
@@ -334,7 +335,7 @@ func CreateDayOfWeekTypePlan(group string, dayOfWeek []int, timesOnDay []string,
 	}
 }
 
-//CreateDayOfMonthTypePlan 创建一个每月计划
+// CreateDayOfMonthTypePlan 创建一个每月计划
 func CreateDayOfMonthTypePlan(group string, dayOfMonth []int, timesOnDay []string, expandValue interface{}, expandTags []string, weights float64) TimeArrow {
 	return TimeArrow{
 		TimeArrowId: createUUID(),
@@ -348,7 +349,7 @@ func CreateDayOfMonthTypePlan(group string, dayOfMonth []int, timesOnDay []strin
 	}
 }
 
-//CreateDateSliceTypePlan 创建一个时间段计划
+// CreateDateSliceTypePlan 创建一个时间段计划
 func CreateDateSliceTypePlan(group string, dateSlice []DateSlice, timesOnDay []string, expandValue interface{}, expandTags []string, weights float64) TimeArrow {
 	return TimeArrow{
 		TimeArrowId: createUUID(),
@@ -368,8 +369,32 @@ type HolidaysItem struct {
 	End   time.Time `json:"end"`
 }
 
+func jsonEncode(v interface{}) string {
+	b, _ := json.Marshal(v)
+	return string(b)
+}
+
 var GetHolidaysData func() ([]HolidaysItem, error)
 
+var holidayCache *cache
+var holidayCacheLock sync.Mutex
+
+func GetHolidaysDataWithCache() ([]HolidaysItem, error) {
+	holidayCacheLock.Lock()
+	defer holidayCacheLock.Unlock()
+	if holidayCache.IsExpired() {
+		data, err := GetHolidaysData()
+		if err != nil {
+			return nil, err
+		}
+		holidayCache.SetData(jsonEncode(data), time.Second*60)
+	}
+	data := holidayCache.GetData()
+	var result []HolidaysItem
+	err := json.Unmarshal([]byte(data), &result)
+	return result, err
+}
+
 type TimeArrowHelper struct {
 	GetData func(group string) (TimeArrows, error)
 }