From a36216f3fd1bcc8043666d38ed70500e959fe5cd Mon Sep 17 00:00:00 2001
From: Yun <yun@yun.ink>
Date: Sun, 6 Aug 2023 01:07:29 +0800
Subject: [PATCH] =?UTF-8?q?=E5=9F=BA=E7=A1=80=E7=89=88?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 example_test.go |  21 ++++++
 go.mod          |   3 +
 rreadme.md      |   8 +++
 timer.go        | 179 ++++++++++++++++++++++++++++++++++++++++++++++++
 timer_test.go   |  21 ++++++
 5 files changed, 232 insertions(+)
 create mode 100644 example_test.go
 create mode 100644 go.mod
 create mode 100644 rreadme.md
 create mode 100644 timer.go
 create mode 100644 timer_test.go

diff --git a/example_test.go b/example_test.go
new file mode 100644
index 0000000..a7a952f
--- /dev/null
+++ b/example_test.go
@@ -0,0 +1,21 @@
+package timer_test
+
+import (
+	"context"
+	"fmt"
+	"code.yun.ink/open/timer"
+)
+
+// 示例测试
+
+func exampleDemo(ctx context.Context) bool {
+	fmt.Println("fff")
+	return false
+}
+
+func ExampleB() {
+	ctx := context.Background()
+	timer.InitSingle(ctx)
+	timer.AddToTimer(1, exampleDemo)
+	// OutPut:
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..2cef1aa
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module code.yun.ink/open/timer
+
+go 1.19
diff --git a/rreadme.md b/rreadme.md
new file mode 100644
index 0000000..587b6ee
--- /dev/null
+++ b/rreadme.md
@@ -0,0 +1,8 @@
+开发目标
+
+1. 支持单机定时
+2. 支持集群定时
+3. 支持间隔定时
+4. 支持固定时间
+5. 支持全局唯一
+
diff --git a/timer.go b/timer.go
new file mode 100644
index 0000000..8cd6668
--- /dev/null
+++ b/timer.go
@@ -0,0 +1,179 @@
+package timer
+
+// 作者：黄新云
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"sync"
+	"time"
+)
+
+// 定时器
+// 原理：每毫秒的时间触发
+
+type singleTimer struct {
+	Callback   callback // 需要回调的方法
+	CanRunning chan (struct{})
+	BeginTime  time.Time     // 初始化任务的时间
+	NextTime   time.Time     // 下一次执行的时间
+	SpaceTime  time.Duration // 间隔时间
+	Params     []int
+}
+
+type clusterTimer struct {
+
+}
+
+var timerMap = make(map[int]*singleTimer)
+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
+
+
+
+// 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)
+	})
+
+}
+
+func InitCluster(ctx context.Context) {}
+
+// 添加需要定时的规则
+func AddToTimer(space time.Duration, call callback) int {
+	timerMapMux.Lock()
+	defer timerMapMux.Unlock()
+
+	timerCount += 1
+	// 计算出首次开始时间和时间间隔，保存在map里面
+
+	nowTime := time.Now()
+
+	t := singleTimer{
+		Callback:   call,
+		BeginTime:  nowTime,
+		NextTime:   nowTime.Add(space),
+		SpaceTime:  space,
+		CanRunning: make(chan struct{}, 1),
+	}
+	timerMap[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
+}
+
+func DelToTimer(index int) {
+	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)
+
+	for k, v := range timerMap {
+		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"))
+
+			// TODO:这个有问题:假如加上一个时间段还是比当前时间小，会导致连续多次执行
+			v.NextTime = v.NextTime.Add(v.SpaceTime)
+
+			if k == 0 {
+				// 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 *singleTimer) {
+				select {
+				case v.CanRunning <- struct{}{}:
+					// TODO: 需要考虑分布式锁
+					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)
+				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(context.Context) bool
+
+// 定时器操作类
+// 这里不应painc
+func timerAction(ctx context.Context, call callback) bool {
+	defer func() {
+		if err := recover(); err != nil {
+			fmt.Println("timer:定时器出错", err)
+		}
+	}()
+	return call(ctx)
+}
diff --git a/timer_test.go b/timer_test.go
new file mode 100644
index 0000000..6fb1621
--- /dev/null
+++ b/timer_test.go
@@ -0,0 +1,21 @@
+package timer_test
+
+import "testing"
+
+// 单元测试
+
+func TestHelloWorld(t *testing.T) {
+	// 日志
+	t.Log("hello world")
+
+	s := "ddd"
+	t.Logf("Log测试%s", s)
+	// t.Errorf("ErrorF %s", s)
+
+	// 标记错误(继续运行)
+	// t.Fail()
+
+	// 终止运行
+	// t.FailNow()
+
+}