create cluster

single.go

@@ -0,0 +1,206 @@
+package timer
+
+// 作者：黄新云
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"log"
+	"runtime/debug"
+	"sync"
+	"time"
+)
+
+// 定时器
+// 原理：每毫秒的时间触发
+
+// uuid -> timerStr
+var timerMap = make(map[string]*timerStr)
+var timerMapMux sync.Mutex
+
+var timerCount int        // 当前定时数目
+var onceLimit sync.Once   // 实现单例
+var nextTime = time.Now() // 下一次执行的时间
+
+type ContextValueKey string // 定义context 传递的Key类型
+
+const (
+	extendParamKey ContextValueKey = "extend_param"
+)
+
+// 定时器类
+func InitSingle(ctx context.Context) {
+	onceLimit.Do(func() {
+		timer := time.NewTicker(1 * time.Millisecond)
+		go func(ctx context.Context) {
+		Loop:
+			for {
+				select {
+				case t := <-timer.C:
+					if t.Before(nextTime) {
+						// 当前时间小于下次发送时间：跳过
+						continue
+					}
+					// 迭代定时器
+					iteratorTimer(ctx, t)
+					// fmt.Println("timer: 执行")
+				case <-ctx.Done():
+					// 跳出循环
+					break Loop
+				}
+			}
+			log.Println("timer: initend")
+		}(ctx)
+	})
+}
+
+// 间隔定时器
+func AddTimer(space time.Duration, call callback, extend ExtendParams) (int, error) {
+	timerMapMux.Lock()
+	defer timerMapMux.Unlock()
+
+	if space != space.Abs() {
+		return 0, errors.New("space must be positive")
+	}
+
+	timerCount += 1
+
+	nowTime := time.Now()
+
+	t := timerStr{
+		Callback:   call,
+		BeginTime:  nowTime,
+		NextTime:   nowTime, // nowTime.Add(space), // 添加任务的时候就执行一次
+		SpaceTime:  space,
+		CanRunning: make(chan struct{}, 1),
+		UniqueKey:  "",
+		Extend:     extend,
+	}
+
+	timerMap[fmt.Sprintf("%d", timerCount)] = &t
+
+	if t.NextTime.Before(nextTime) {
+		// 本条规则下次需要发送的时间小于系统下次发送时间：替换
+		nextTime = t.NextTime
+	}
+
+	return timerCount, nil
+}
+
+// 添加需要定时的规则
+func AddToTimer(space time.Duration, call callback) int {
+	extend := ExtendParams{}
+	count, _ := AddTimer(space, call, extend)
+	return count
+}
+
+func DelToTimer(index string) {
+	timerMapMux.Lock()
+	defer timerMapMux.Unlock()
+	delete(timerMap, index)
+}
+
+// 迭代定时器列表
+func iteratorTimer(ctx context.Context, nowTime time.Time) {
+	timerMapMux.Lock()
+	defer timerMapMux.Unlock()
+
+	// fmt.Println("nowTime:", nowTime.Format("2006-01-02 15:04:05.000"))
+
+	// 默认5秒后（如果没有值就暂停进来5秒）
+	newNextTime := nowTime.Add(time.Second * 5)
+
+	index := 0
+	for _, v := range timerMap {
+		index++
+		v := v
+		// 判断执行的时机
+		if v.NextTime.Before(nowTime) {
+			// fmt.Println("NextTime", v.NextTime.Format("2006-01-02 15:04:05.000"))
+
+			v.NextTime = v.NextTime.Add(v.SpaceTime)
+
+			// 判断下次执行时间与当前时间
+			if v.NextTime.Before(nowTime) {
+				v.NextTime = nowTime.Add(v.SpaceTime)
+			}
+
+			if index == 1 {
+				// 循环的第一个需要替换默认值
+				newNextTime = v.NextTime
+			}
+
+			// 获取最小的
+			if v.NextTime.Before(newNextTime) {
+				// 本规则下次发送时间小于系统下次需要执行的时间：替换
+				newNextTime = v.NextTime
+			}
+
+			// 处理中就跳过本次
+			go func(ctx context.Context, v *timerStr) {
+				select {
+				case v.CanRunning <- struct{}{}:
+					defer func() {
+						// fmt.Printf("timer: 执行完成 %v %v \n", k, v.Tag)
+						select {
+						case <-v.CanRunning:
+							return
+						default:
+							return
+						}
+					}()
+					// fmt.Printf("timer: 准备执行 %v %v \n", k, v.Tag)
+					timerAction(ctx, v.Callback, v.UniqueKey, v.Extend)
+				default:
+					// fmt.Printf("timer: 已在执行 %v %v \n", k, v.Tag)
+					return
+				}
+			}(ctx, v)
+		}
+	}
+
+	// 实际下次时间小于预期下次时间：替换
+	if nextTime.Before(newNextTime) {
+		// 判断一下避免异常
+		if newNextTime.Before(nowTime) {
+			// 比当前时间小
+			nextTime = nowTime
+		} else {
+			nextTime = newNextTime
+		}
+	}
+
+	// fmt.Println("timer: one finish")
+}
+
+// 定义各个回调函数
+type callback func(ctx context.Context) bool
+
+// 定时器操作类
+// 这里不应painc
+func timerAction(ctx context.Context, call callback, uniqueKey string, extend ExtendParams) bool {
+	defer func() {
+		if err := recover(); err != nil {
+			fmt.Println("timer:定时器出错", err)
+			log.Println("errStack", string(debug.Stack()))
+		}
+	}()
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+
+	// 附加数据
+	ctx = context.WithValue(ctx, extendParamKey, extend)
+
+	return call(ctx)
+}
+
+// 快捷方法
+func GetExtendParams(ctx context.Context) (*ExtendParams, error) {
+	val := ctx.Value(extendParamKey)
+	params, ok := val.(ExtendParams)
+	if !ok {
+		return nil, errors.New("没找到参数")
+	}
+	return &params, nil
+}