initial import

core/stat/alert.go

@@ -0,0 +1,70 @@
+// +build linux
+
+package stat
+
+import (
+	"flag"
+	"fmt"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"zero/core/executors"
+	"zero/core/proc"
+	"zero/core/sysx"
+	"zero/core/timex"
+	"zero/core/utils"
+)
+
+const (
+	clusterNameKey = "CLUSTER_NAME"
+	testEnv        = "test.v"
+	timeFormat     = "2006-01-02 15:04:05"
+)
+
+var (
+	reporter     = utils.Report
+	lock         sync.RWMutex
+	lessExecutor = executors.NewLessExecutor(time.Minute * 5)
+	dropped      int32
+	clusterName  = proc.Env(clusterNameKey)
+)
+
+func init() {
+	if flag.Lookup(testEnv) != nil {
+		SetReporter(nil)
+	}
+}
+
+func Report(msg string) {
+	lock.RLock()
+	fn := reporter
+	lock.RUnlock()
+
+	if fn != nil {
+		reported := lessExecutor.DoOrDiscard(func() {
+			var builder strings.Builder
+			fmt.Fprintf(&builder, "%s\n", timex.Time().Format(timeFormat))
+			if len(clusterName) > 0 {
+				fmt.Fprintf(&builder, "cluster: %s\n", clusterName)
+			}
+			fmt.Fprintf(&builder, "host: %s\n", sysx.Hostname())
+			dp := atomic.SwapInt32(&dropped, 0)
+			if dp > 0 {
+				fmt.Fprintf(&builder, "dropped: %d\n", dp)
+			}
+			builder.WriteString(strings.TrimSpace(msg))
+			fn(builder.String())
+		})
+		if !reported {
+			atomic.AddInt32(&dropped, 1)
+		}
+	}
+}
+
+func SetReporter(fn func(string)) {
+	lock.Lock()
+	defer lock.Unlock()
+	reporter = fn
+}