Improve tso codecov (#7407)

Signed-off-by: yudong.cai <yudong.cai@zilliz.com>

internal/tso/global_allocator_test.go

@@ -12,6 +12,7 @@
 package tso
 
 import (
+	"math"
 	"os"
 	"strings"
 	"testing"
@@ -87,8 +88,58 @@ func TestGlobalTSOAllocator_All(t *testing.T) {
 		assert.Nil(t, err)
 	})
 
+	t.Run("Alloc", func(t *testing.T) {
+		_, err := gTestTsoAllocator.Alloc(100)
+		assert.Nil(t, err)
+	})
+
+	t.Run("AllocOne", func(t *testing.T) {
+		_, err := gTestTsoAllocator.AllocOne()
+		assert.Nil(t, err)
+	})
+
+	t.Run("Reset", func(t *testing.T) {
+		gTestTsoAllocator.Reset()
+	})
+}
+
+func TestGlobalTSOAllocator_Fail(t *testing.T) {
+	endpoints := os.Getenv("ETCD_ENDPOINTS")
+	if endpoints == "" {
+		endpoints = "localhost:2379"
+	}
+	etcdEndpoints := strings.Split(endpoints, ",")
+	etcdKV, err := tsoutil.NewTSOKVBase(etcdEndpoints, "/test/root/kv", "tsoTest")
+	assert.NoError(t, err)
+	gTestTsoAllocator = NewGlobalTSOAllocator("timestamp", etcdKV)
+	t.Run("Initialize", func(t *testing.T) {
+		err := gTestTsoAllocator.Initialize()
+		assert.Nil(t, err)
+	})
+
+	t.Run("GenerateTSO_invalid", func(t *testing.T) {
+		_, err := gTestTsoAllocator.GenerateTSO(0)
+		assert.NotNil(t, err)
+	})
+
+	gTestTsoAllocator.SetLimitMaxLogic(true)
+	t.Run("SetTSO_invalid", func(t *testing.T) {
+		err := gTestTsoAllocator.SetTSO(0)
+		assert.NotNil(t, err)
+
+		err = gTestTsoAllocator.SetTSO(math.MaxUint64)
+		assert.NotNil(t, err)
+	})
+
+	t.Run("Alloc_invalid", func(t *testing.T) {
+		_, err := gTestTsoAllocator.Alloc(0)
+		assert.NotNil(t, err)
+
+		_, err = gTestTsoAllocator.Alloc(math.MaxUint32)
+		assert.NotNil(t, err)
+	})
+
 	t.Run("Reset", func(t *testing.T) {
 		gTestTsoAllocator.Reset()
 	})
-
 }

internal/tso/tso.go

@@ -68,19 +68,19 @@ type timestampOracle struct {
 	lastSavedTime atomic.Value
 }
 
-func (t *timestampOracle) loadTimestamp() (time.Time, error) {
-	strData, err := t.txnKV.Load(t.key)
-
-	var binData []byte = []byte(strData)
-
-	if err != nil {
-		return typeutil.ZeroTime, err
-	}
-	if len(binData) == 0 {
-		return typeutil.ZeroTime, nil
-	}
-	return typeutil.ParseTimestamp(binData)
-}
+//func (t *timestampOracle) loadTimestamp() (time.Time, error) {
+//	strData, err := t.txnKV.Load(t.key)
+//
+//	var binData []byte = []byte(strData)
+//
+//	if err != nil {
+//		return typeutil.ZeroTime, err
+//	}
+//	if len(binData) == 0 {
+//		return typeutil.ZeroTime, nil
+//	}
+//	return typeutil.ParseTimestamp(binData)
+//}
 
 // save timestamp, if lastTs is 0, we think the timestamp doesn't exist, so create it,
 // otherwise, update it.
@@ -95,12 +95,10 @@ func (t *timestampOracle) saveTimestamp(ts time.Time) error {
 }
 
 func (t *timestampOracle) InitTimestamp() error {
-
 	//last, err := t.loadTimestamp()
 	//if err != nil {
 	//	return err
 	//}
-
 	next := time.Now()
 
 	// If the current system time minus the saved etcd timestamp is less than `updateTimestampGuard`,