feat: add health check

health/checker.go

@@ -0,0 +1,73 @@
+package health
+
+import (
+	"context"
+	"sync"
+	"time"
+)
+
+type Checker interface {
+	Check(ctx context.Context) (interface{}, error)
+}
+
+type Watcher func(string)
+
+type checker struct {
+	Name         string
+	intervalTime time.Duration
+	timeout      time.Duration
+	Checker
+	CheckerStatus
+	sync.RWMutex
+	Watcher
+}
+
+func NewChecker(name string, checker Checker) {
+
+}
+
+func (c *checker) check(ctx context.Context) bool {
+	defer func() {
+		recover()
+	}()
+	ctx, cancel := context.WithTimeout(ctx, c.timeout)
+	defer cancel()
+	detail, err := c.Check(ctx)
+	status := StatusUp
+	if err != nil {
+		status = StatusDown
+	}
+	c.Lock()
+	defer c.Unlock()
+	old := c.CheckerStatus
+	c.CheckerStatus = CheckerStatus{
+		Status: status,
+		Detail: detail,
+		Err:    err,
+	}
+	if c.CheckerStatus == old {
+		return false
+	}
+	return true
+}
+
+func (c *checker) run(ctx context.Context) {
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		default:
+		}
+		if c.check(ctx) {
+			//发送改变通知
+			c.Watcher(c.Name)
+		}
+		time.Sleep(c.intervalTime)
+	}
+}
+
+func (c *checker) getStatus() CheckerStatus {
+	c.RLock()
+	defer c.RUnlock()
+	return c.CheckerStatus
+}

health/health.go

@@ -0,0 +1,63 @@
+package health
+
+import (
+	"golang.org/x/net/context"
+)
+
+type CheckerMgr struct {
+	checkers map[string]checker
+	ctx      context.Context
+	cancel   func()
+	watchers []chan string
+}
+
+func New(ctx context.Context) *CheckerMgr {
+	c, cancel := context.WithCancel(ctx)
+	return &CheckerMgr{
+		checkers: make(map[string]checker),
+		ctx:      c,
+		cancel:   cancel,
+	}
+}
+
+func (c *CheckerMgr) Start() {
+	for _, v := range c.checkers {
+		go func() {
+			v.run(c.ctx)
+		}()
+	}
+}
+
+func (c *CheckerMgr) Stop() {
+	c.cancel()
+}
+
+type StatusResult struct {
+	Name string
+	CheckerStatus
+}
+
+// GetStatus
+//
+//	if name is nil return all status
+func (c *CheckerMgr) GetStatus(name ...string) []StatusResult {
+	status := make([]StatusResult, 0, len(name))
+	if len(name) == 0 {
+		for _, v := range c.checkers {
+			status = append(status, StatusResult{
+				Name:          v.Name,
+				CheckerStatus: v.getStatus(),
+			})
+		}
+	} else {
+		for _, n := range name {
+			if v, ok := c.checkers[n]; ok {
+				status = append(status, StatusResult{
+					Name:          v.Name,
+					CheckerStatus: v.getStatus(),
+				})
+			}
+		}
+	}
+	return status
+}

health/status.go

@@ -0,0 +1,14 @@
+package health
+
+type Status int
+
+const (
+	StatusDown Status = iota
+	StatusUp
+)
+
+type CheckerStatus struct {
+	Status
+	Detail interface{}
+	Err    error
+}