optimized staking weight value (#3119)

* optimized staking weight value

* optimized code

* optimized code

Author: zjg555543

x/staking/keeper/weight.go

@@ -14,16 +14,16 @@ const (
 	blockTimestampEpoch = int64(946684800)
 	secondsPerWeek      = int64(60 * 60 * 24 * 7)
 	weeksPerYear        = float64(52)
-	fixedTimeStamp      = int64(1685577600) // 2023-06-01 00:00:00 GMT+0
-	fixedWeek           = int64(1221)       // (fixedTimeStamp - blockTimestampEpoch) / secondsPerWeek
+	fixedWeight         = int64(11700000) // The weight of 1 okt, calculated by calculateWeight before venus6. (nowTime=2023-06-01 00:00:00 GMT+0)
 )
 
 func calculateWeight(nowTime int64, tokens sdk.Dec, height int64) (shares types.Shares, sdkErr error) {
-	nowWeek := fixedWeek
-	if !types2.HigherThanVenus6(height) {
-		nowWeek = (nowTime - blockTimestampEpoch) / secondsPerWeek
+	if types2.HigherThanVenus6(height) {
+		shares = tokens.MulInt64(fixedWeight)
+		return
 	}
 
+	nowWeek := (nowTime - blockTimestampEpoch) / secondsPerWeek
 	rate := float64(nowWeek) / weeksPerYear
 	weight := math.Pow(float64(2), rate)
 

x/staking/keeper/weight_test.go

@@ -35,27 +35,29 @@ func TestProposalSuite(t *testing.T) {
 func (suite *ProposalSuite) TestNewChangeDistributionTypeProposal() {
 	testCases := []struct {
 		title         string
+		curTime       string
 		curHeight     int64
 		upgradeHeight int64
 		quo           int64
 	}{
-		{"default", 100, 0, 2},
-		{"set upgrade height, not reached height", 100, 100, 2},
-		{"set upgrade height, reached height", 101, 100, 1},
+		{"default", "2023-05-01 00:00:00", 100, 0, 2},
+		{"set upgrade height, not reached height", "2023-05-01 00:00:00", 100, 100, 2},
+		{"set upgrade height, reached height", "2023-05-01 00:00:00", 101, 100, 1},
 	}
-	formatTime, _ := gotime.Parse("2006-01-02 15:04:05", "2023-06-01 00:00:00")
-	require.Equal(suite.T(), formatTime.Unix(), fixedTimeStamp)
 
 	for _, tc := range testCases {
 		suite.Run(tc.title, func() {
+			tokens := sdk.NewDec(1)
+			curTime, _ := gotime.Parse("2006-01-02 15:04:05", tc.curTime)
+			curDecBefore, err := calculateWeight(curTime.Unix(), tokens, tc.curHeight)
 			global.SetGlobalHeight(tc.curHeight)
 			tmtypes.InitMilestoneVenus6Height(tc.upgradeHeight)
-			tokens := sdk.NewDec(1000)
-			nowDec, err := calculateWeight(time.Now().Unix(), tokens, tc.curHeight)
+			curDec, err := calculateWeight(curTime.Unix(), tokens, tc.curHeight)
+			require.Equal(suite.T(), true, curDec.GTE(curDecBefore))
 			require.NoError(suite.T(), err)
-			afterDec, err := calculateWeight(time.Now().AddDate(0, 0, 52*7).Unix(), tokens, tc.curHeight)
+			afterDec, err := calculateWeight(curTime.AddDate(0, 0, 52*7).Unix(), tokens, tc.curHeight)
 			require.NoError(suite.T(), err)
-			require.Equal(suite.T(), sdk.NewDec(tc.quo), afterDec.Quo(nowDec))
+			require.Equal(suite.T(), sdk.NewDec(tc.quo), afterDec.Quo(curDec))
 		})
 	}
 }