Merge pull request #2 from assimon/dev

修复：优化创建交易流程代码，将金额修改为保留3位小数点

src/config/config.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"github.com/spf13/viper"
 	"os"
+	"time"
 )
 
 var (
@@ -53,7 +54,7 @@ func Init() {
 }
 
 func GetAppVersion() string {
-	return "0.0.1"
+	return "0.0.2"
 }
 
 func GetAppName() string {
@@ -90,3 +91,8 @@ func GetOrderExpirationTime() int {
 	}
 	return timer
 }
+
+func GetOrderExpirationTimeDuration() time.Duration {
+	timer := GetOrderExpirationTime()
+	return time.Minute * time.Duration(timer)
+}

src/go.mod

@@ -7,8 +7,8 @@ require (
 	github.com/go-resty/resty/v2 v2.7.0
 	github.com/golang-module/carbon/v2 v2.0.1
 	github.com/gookit/color v1.5.0
-	github.com/gookit/goutil v0.4.4
+	github.com/gookit/goutil v0.4.6
-	github.com/gookit/validate v1.2.11
+	github.com/gookit/validate v1.3.1
 	github.com/hibiken/asynq v0.22.1
 	github.com/json-iterator/go v1.1.12
 	github.com/labstack/echo/v4 v4.6.0

src/go.sum

@@ -197,8 +197,12 @@ github.com/gookit/filter v1.1.2/go.mod h1:pVXLLDD+A8yH9GRztq2Cp7zwZocnuTUpbZs9Q+
 github.com/gookit/goutil v0.3.12/go.mod h1:ITj7Lw0muhJNOX+QRa+j+HH0+RNoQVuTmZx5d5LE1vE=
 github.com/gookit/goutil v0.4.4 h1:18xr8NKbs4LteyOHZfQ8g7JqTqZal801mAT6LERGdpE=
 github.com/gookit/goutil v0.4.4/go.mod h1:qlGVh0PI+WnWSjYnIocfz/7tkeogxL6+EDNP1mRe+7o=
+github.com/gookit/goutil v0.4.6 h1:LSATnmIyR0rV4BMj3XyaKFYtX/HbRURnPVHt6Zb5ABs=
+github.com/gookit/goutil v0.4.6/go.mod h1:pq1eTibwb2wN96jrci0xy7xogWzzo9CihOQJEAvz4yQ=
 github.com/gookit/validate v1.2.11 h1:zUMsezhMrW3Cy8St3cQJgCKB1ZIbKOWK8e7WMSuVIRc=
 github.com/gookit/validate v1.2.11/go.mod h1:wXo0Vr+AzFUCEUCbTFXgKlPfT+V/V0wPK3zLp49jQq0=
+github.com/gookit/validate v1.3.1 h1:YoxBxG5H+WucKjfEo8X+QvYOzED7ue3Mfpq6jtpIbYs=
+github.com/gookit/validate v1.3.1/go.mod h1:mzcr3U5XtAlQVAgbW0wbmDGiuefU/MNuDkXFMBNb1ko=
 github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
 github.com/grpc-ecosystem/grpc-gateway v1.16.0/go.mod h1:BDjrQk3hbvj6Nolgz8mAMFbcEtjT1g+wF4CSlocrBnw=
 github.com/hashicorp/consul/api v1.1.0/go.mod h1:VmuI/Lkw1nC05EYQWNKwWGbkg+FbDBtguAZLlVdkD9Q=
@@ -370,6 +374,7 @@ github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/subosito/gotenv v1.2.0 h1:Slr1R9HxAlEKefgq5jn9U+DnETlIUa6HfgEzj0g5d7s=
 github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw=
 github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw=

src/model/data/order_data.go

@@ -8,11 +8,11 @@ import (
 	"github.com/assimon/luuu/model/request"
 	"github.com/go-redis/redis/v8"
 	"gorm.io/gorm"
+	"time"
 )
 
 var (
-	CacheWalletAddressToAvailableAmountKey = "WalletAddressToAvailableAmountKey:" // 钱包 - 可用金额 - 过期时间
+	CacheWalletAddressWithAmountToTradeIdKey = "wallet:%s_%v" // 钱包_待支付金额 : 交易号
-	CacheWalletAddressToOrdersKey          = "WalletAddressToOrdersKey:"          // 钱包 - 待支付金额 - 订单号
 )
 
 // GetOrderInfoByOrderId 通过客户订单号查询订单
@@ -78,36 +78,11 @@ func UpdateOrderIsExpirationById(id uint64) error {
 	return err
 }
 
-// LockPayCache 锁定支付池
+// GetTradeIdByWalletAddressAndAmount 通过钱包地址，支付金额获取交易号
-func LockPayCache(token, tradeId, amount string, expirationTime int64) error {
+func GetTradeIdByWalletAddressAndAmount(token string, amount float64) (string, error) {
-	// 载入Redis
 	ctx := context.Background()
-	pipe := dao.Rdb.TxPipeline()
+	cacheKey := fmt.Sprintf(CacheWalletAddressWithAmountToTradeIdKey, token, amount)
-	lockAvailableAmountKey := fmt.Sprintf("%s%s", CacheWalletAddressToAvailableAmountKey, token)
+	result, err := dao.Rdb.Get(ctx, cacheKey).Result()
-	// 占用金额
-	pipe.HSet(ctx, lockAvailableAmountKey, amount, expirationTime)
-	// 标记金额对应订单号
-	lockWalletOrdersKey := fmt.Sprintf("%s%s", CacheWalletAddressToOrdersKey, token)
-	pipe.HSet(ctx, lockWalletOrdersKey, amount, tradeId)
-	_, err := pipe.Exec(ctx)
-	return err
-}
-
-// ClearPayCache 清理支付池
-func ClearPayCache(token, amount string) error {
-	ctx := context.Background()
-	lockAvailableAmountKey := fmt.Sprintf("%s%s", CacheWalletAddressToAvailableAmountKey, token)
-	lockWalletOrdersKey := fmt.Sprintf("%s%s", CacheWalletAddressToOrdersKey, token)
-	pipe := dao.Rdb.TxPipeline()
-	pipe.HDel(ctx, lockAvailableAmountKey, amount)
-	pipe.HDel(ctx, lockWalletOrdersKey, amount)
-	_, err := pipe.Exec(ctx)
-	return err
-}
-
-func GetTradeIdByAmount(ctx context.Context, token, amount string) (string, error) {
-	cacheKey := fmt.Sprintf("%s%s", CacheWalletAddressToOrdersKey, token)
-	result, err := dao.Rdb.HGet(ctx, cacheKey, amount).Result()
 	if err == redis.Nil {
 		return "", nil
 	}
@@ -117,14 +92,18 @@ func GetTradeIdByAmount(ctx context.Context, token, amount string) (string, erro
 	return result, nil
 }
 
-func GetExpirationTimeByAmount(ctx context.Context, token, amount string) (string, error) {
+// LockTransaction 锁定交易
-	cacheKey := fmt.Sprintf("%s%s", CacheWalletAddressToAvailableAmountKey, token)
+func LockTransaction(token, tradeId string, amount float64, expirationTime time.Duration) error {
-	result, err := dao.Rdb.HGet(ctx, cacheKey, amount).Result()
+	ctx := context.Background()
-	if err == redis.Nil {
+	cacheKey := fmt.Sprintf(CacheWalletAddressWithAmountToTradeIdKey, token, amount)
-		return "", nil
+	err := dao.Rdb.Set(ctx, cacheKey, tradeId, expirationTime).Err()
-	}
+	return err
-	if err != nil {
+}
-		return "", err
+
-	}
+// UnLockTransaction 解锁交易
-	return result, nil
+func UnLockTransaction(token string, amount float64) error {
+	ctx := context.Background()
+	cacheKey := fmt.Sprintf(CacheWalletAddressWithAmountToTradeIdKey, token, amount)
+	err := dao.Rdb.Del(ctx, cacheKey).Err()
+	return err
 }

src/model/request/order_request.go

@@ -23,7 +23,7 @@ func (r CreateTransactionRequest) Translates() map[string]string {
 // OrderProcessingRequest 订单处理
 type OrderProcessingRequest struct {
 	Token              string
-	Amount             string
+	Amount             float64
 	TradeId            string
 	BlockTransactionId string
 }

src/model/service/order_service.go

@@ -1,7 +1,6 @@
 package service
 
 import (
-	"context"
 	"fmt"
 	"github.com/assimon/luuu/config"
 	"github.com/assimon/luuu/model/dao"
@@ -11,35 +10,40 @@ import (
 	"github.com/assimon/luuu/model/response"
 	"github.com/assimon/luuu/mq"
 	"github.com/assimon/luuu/mq/handle"
-	"github.com/assimon/luuu/telegram"
 	"github.com/assimon/luuu/util/constant"
+	"github.com/assimon/luuu/util/math"
 	"github.com/golang-module/carbon/v2"
-	"github.com/gookit/goutil/mathutil"
 	"github.com/hibiken/asynq"
 	"github.com/shopspring/decimal"
 	"math/rand"
-	"strconv"
 	"sync"
 	"time"
 )
 
+const (
+	CnyMinimumPaymentAmount  = 0.01  // cny最低支付金额
+	UsdtMinimumPaymentAmount = 0.001 // usdt最低支付金额
+	UsdtAmountPerIncrement   = 0.001 // usdt每次递增金额
+	IncrementalMaximumNumber = 100   // 最大递增次数
+)
+
 var gCreateTransactionLock sync.Mutex
 
 // CreateTransaction 创建订单
 func CreateTransaction(req *request.CreateTransactionRequest) (*response.CreateTransactionResponse, error) {
 	gCreateTransactionLock.Lock()
 	defer gCreateTransactionLock.Unlock()
-	// 汇率计算金额
+	payAmount := math.MustParsePrecFloat64(req.Amount, 2)
-	rmb := decimal.NewFromFloat(req.Amount)
+	// 按照汇率转化USDT
-	rate := decimal.NewFromFloat(config.GetUsdtRate())
+	decimalPayAmount := decimal.NewFromFloat(payAmount)
-	amount := rmb.Div(rate).InexactFloat64()
+	decimalRate := decimal.NewFromFloat(config.GetUsdtRate())
-	actualAmountStr := fmt.Sprintf("%.4f", amount)
+	decimalUsdt := decimalPayAmount.Div(decimalRate)
-	actualAmountFloat, err := strconv.ParseFloat(actualAmountStr, 64)
+	// cny 是否可以满足最低支付金额
-	if err != nil {
+	if decimalPayAmount.Cmp(decimal.NewFromFloat(CnyMinimumPaymentAmount)) == -1 {
-		return nil, err
+		return nil, constant.PayAmountErr
 	}
-	// 是否可以满足最低支付金额
+	// Usdt是否可以满足最低支付金额
-	if actualAmountFloat <= 0 {
+	if decimalUsdt.Cmp(decimal.NewFromFloat(UsdtMinimumPaymentAmount)) == -1 {
 		return nil, constant.PayAmountErr
 	}
 	// 已经存在了的交易
@@ -58,23 +62,20 @@ func CreateTransaction(req *request.CreateTransactionRequest) (*response.CreateT
 	if len(walletAddress) <= 0 {
 		return nil, constant.NotAvailableWalletAddress
 	}
-	availableToken, availableAmountStr, err := CalculateAvailableWalletTokenAndAmount(actualAmountStr, walletAddress)
+	amount := math.MustParsePrecFloat64(decimalUsdt.InexactFloat64(), 3)
+	availableToken, availableAmount, err := CalculateAvailableWalletAndAmount(amount, walletAddress)
 	if err != nil {
 		return nil, err
 	}
-	if availableToken == "" || availableAmountStr == "" {
+	if availableToken == "" {
 		return nil, constant.NotAvailableAmountErr
 	}
-	availableAmountFloat, err := strconv.ParseFloat(availableAmountStr, 64)
-	if err != nil {
-		return nil, err
-	}
 	tx := dao.Mdb.Begin()
 	order := &mdb.Orders{
 		TradeId:      GenerateCode(),
 		OrderId:      req.OrderId,
 		Amount:       req.Amount,
-		ActualAmount: availableAmountFloat,
+		ActualAmount: availableAmount,
 		Token:        availableToken,
 		Status:       mdb.StatusWaitPay,
 		NotifyUrl:    req.NotifyUrl,
@@ -85,9 +86,8 @@ func CreateTransaction(req *request.CreateTransactionRequest) (*response.CreateT
 		tx.Rollback()
 		return nil, err
 	}
-	ExpirationTime := carbon.Now().AddMinutes(config.GetOrderExpirationTime()).Timestamp()
 	// 锁定支付池
-	err = data.LockPayCache(availableToken, order.TradeId, availableAmountStr, ExpirationTime)
+	err = data.LockTransaction(availableToken, order.TradeId, availableAmount, config.GetOrderExpirationTimeDuration())
 	if err != nil {
 		tx.Rollback()
 		return nil, err
@@ -95,7 +95,8 @@ func CreateTransaction(req *request.CreateTransactionRequest) (*response.CreateT
 	tx.Commit()
 	// 超时过期消息队列
 	orderExpirationQueue, _ := handle.NewOrderExpirationQueue(order.TradeId)
-	mq.MClient.Enqueue(orderExpirationQueue, asynq.ProcessIn(time.Minute*time.Duration(config.GetOrderExpirationTime())))
+	mq.MClient.Enqueue(orderExpirationQueue, asynq.ProcessIn(config.GetOrderExpirationTimeDuration()))
+	ExpirationTime := carbon.Now().AddMinutes(config.GetOrderExpirationTime()).Timestamp()
 	resp := &response.CreateTransactionResponse{
 		TradeId:        order.TradeId,
 		OrderId:        order.OrderId,
@@ -125,88 +126,51 @@ func OrderProcessing(req *request.OrderProcessingRequest) error {
 		tx.Rollback()
 		return err
 	}
-	err = data.ClearPayCache(req.Token, req.Amount)
+	// 解锁交易
-	tx.Commit()
+	err = data.UnLockTransaction(req.Token, req.Amount)
-	order, err := data.GetOrderInfoByTradeId(req.TradeId)
 	if err != nil {
+		tx.Rollback()
 		return err
 	}
-	// 回调队列
+	tx.Commit()
-	orderCallbackQueue, _ := handle.NewOrderCallbackQueue(order)
-	mq.MClient.Enqueue(orderCallbackQueue, asynq.MaxRetry(5))
-	// 发送机器人消息
-	msgTpl := `
-<b>📢📢有新的交易支付成功！</b>
-<pre>交易号：%s</pre>
-<pre>订单号：%s</pre>
-<pre>请求支付金额：%.4f cny</pre>
-<pre>实际支付金额：%.4f usdt</pre>
-<pre>钱包地址：%s</pre>
-<pre>订单创建时间：%s</pre>
-<pre>支付成功时间：%s</pre>
-`
-	msg := fmt.Sprintf(msgTpl, order.TradeId, order.OrderId, order.Amount, order.ActualAmount, order.Token, order.CreatedAt.ToDateTimeString(), carbon.Now().ToDateTimeString())
-	telegram.SendToBot(msg)
 	return nil
 }
 
-func CalculateAvailableWalletTokenAndAmount(amount string, walletAddress []mdb.WalletAddress) (string, string, error) {
+// CalculateAvailableWalletAndAmount 计算可用钱包地址和金额
-	calculateAmountStr := amount
+func CalculateAvailableWalletAndAmount(amount float64, walletAddress []mdb.WalletAddress) (string, float64, error) {
-	availableAmountStr := ""
 	availableToken := ""
-	for i := 0; i < 100; i++ {
+	availableAmount := amount
-		token, err := CalculateAvailableWalletToken(calculateAmountStr, walletAddress)
+	calculateAvailableWalletFunc := func(amount float64) (string, error) {
-		if err != nil {
+		availableWallet := ""
-			return "", "", err
+		for _, address := range walletAddress {
+			token := address.Token
+			result, err := data.GetTradeIdByWalletAddressAndAmount(token, amount)
+			if err != nil {
+				return "", err
+			}
+			if result == "" {
+				availableWallet = token
+				break
+			}
 		}
-		// 这个金额没有拿到可用的钱包，重试，金额+0.0001
+		return availableWallet, nil
+	}
+	for i := 0; i < IncrementalMaximumNumber; i++ {
+		token, err := calculateAvailableWalletFunc(availableAmount)
+		if err != nil {
+			return "", 0, err
+		}
+		// 拿不到可用钱包就累加金额
 		if token == "" {
-			x, err := decimal.NewFromString(calculateAmountStr)
+			decimalOldAmount := decimal.NewFromFloat(availableAmount)
-			if err != nil {
+			decimalIncr := decimal.NewFromFloat(UsdtAmountPerIncrement)
-				return "", "", err
+			availableAmount = decimalOldAmount.Add(decimalIncr).InexactFloat64()
-			}
-			y, err := decimal.NewFromString("0.0001")
-			if err != nil {
-				return "", "", err
-			}
-			calculateAmountStr = x.Add(y).String()
 			continue
 		}
-		availableAmountStr = calculateAmountStr
 		availableToken = token
 		break
 	}
-	return availableToken, availableAmountStr, nil
+	return availableToken, availableAmount, nil
-}
-
-// CalculateAvailableWalletToken 计算可用钱包token
-func CalculateAvailableWalletToken(payAmount string, walletAddress []mdb.WalletAddress) (string, error) {
-	nowTime := time.Now().Unix()
-	ctx := context.Background()
-	walletToken := ""
-	for _, address := range walletAddress {
-		result, err := data.GetExpirationTimeByAmount(ctx, address.Token, payAmount)
-		if err != nil {
-			return "", err
-		}
-		// 这个钱包金额被占用了
-		if result != "" {
-			endTime := mathutil.MustInt64(result)
-			// 但是过期了
-			if endTime < nowTime {
-				// 删掉过期，还能继续用这个地址
-				err = data.ClearPayCache(address.Token, payAmount)
-				if err != nil {
-					return "", err
-				}
-			} else {
-				continue
-			}
-		}
-		walletToken = address.Token
-		break
-	}
-	return walletToken, nil
 }
 
 // GenerateCode 订单号生成

src/model/service/task_service.go

@@ -1,20 +1,21 @@
 package service
 
 import (
-	"context"
 	"fmt"
 	"github.com/assimon/luuu/model/data"
 	"github.com/assimon/luuu/model/request"
+	"github.com/assimon/luuu/mq"
+	"github.com/assimon/luuu/mq/handle"
+	"github.com/assimon/luuu/telegram"
 	"github.com/assimon/luuu/util/http_client"
 	"github.com/assimon/luuu/util/json"
 	"github.com/assimon/luuu/util/log"
 	"github.com/golang-module/carbon/v2"
-	"github.com/gookit/goutil/mathutil"
 	"github.com/gookit/goutil/stdutil"
+	"github.com/hibiken/asynq"
 	"github.com/shopspring/decimal"
 	"net/http"
 	"sync"
-	"time"
 )
 
 const UsdtTrc20ApiUri = "https://apilist.tronscan.org/api/token_trc20/transfers"
@@ -90,38 +91,33 @@ func Trc20CallBack(token string, wg *sync.WaitGroup) {
 	if trc20Resp.Total <= 0 {
 		return
 	}
-	ctx := context.Background()
-	nowTime := time.Now().Unix()
 	for _, transfer := range trc20Resp.TokenTransfers {
 		if transfer.ToAddress != token || transfer.FinalResult != "SUCCESS" {
 			continue
 		}
-		x, _ := decimal.NewFromString(transfer.Quant)
+		decimalQuant, err := decimal.NewFromString(transfer.Quant)
-		y, _ := decimal.NewFromString("1000000")
-		quant := x.Div(y).InexactFloat64()
-		amount := fmt.Sprintf("%.4f", quant)
-		result, err := data.GetExpirationTimeByAmount(ctx, token, amount)
 		if err != nil {
 			panic(err)
 		}
-		if result != "" {
+		decimalDivisor := decimal.NewFromFloat(1000000)
-			expTime := mathutil.MustInt64(result)
+		amount := decimalQuant.Div(decimalDivisor).InexactFloat64()
-			// 但是过期了
+		tradeId, err := data.GetTradeIdByWalletAddressAndAmount(token, amount)
-			if expTime < nowTime {
-				// 删掉过期
-				_ = data.ClearPayCache(token, amount)
-				continue
-			}
-		}
-		// 该钱包下有无匹配金额订单
-		tradeId, err := data.GetTradeIdByAmount(ctx, token, amount)
 		if err != nil {
 			panic(err)
 		}
 		if tradeId == "" {
 			continue
 		}
-		// 到这一步就匹配到金额了
+		order, err := data.GetOrderInfoByTradeId(tradeId)
+		if err != nil {
+			panic(err)
+		}
+		// 区块的确认时间必须在订单创建时间之后
+		createTime := order.CreatedAt.TimestampWithMillisecond()
+		if transfer.BlockTs < createTime {
+			panic("Orders cannot actually be matched")
+		}
+		// 到这一步就完全算是支付成功了
 		req := &request.OrderProcessingRequest{
 			Token:              token,
 			TradeId:            tradeId,
@@ -132,5 +128,21 @@ func Trc20CallBack(token string, wg *sync.WaitGroup) {
 		if err != nil {
 			panic(err)
 		}
+		// 回调队列
+		orderCallbackQueue, _ := handle.NewOrderCallbackQueue(order)
+		mq.MClient.Enqueue(orderCallbackQueue, asynq.MaxRetry(5))
+		// 发送机器人消息
+		msgTpl := `
+<b>📢📢有新的交易支付成功！</b>
+<pre>交易号：%s</pre>
+<pre>订单号：%s</pre>
+<pre>请求支付金额：%f cny</pre>
+<pre>实际支付金额：%f usdt</pre>
+<pre>钱包地址：%s</pre>
+<pre>订单创建时间：%s</pre>
+<pre>支付成功时间：%s</pre>
+`
+		msg := fmt.Sprintf(msgTpl, order.TradeId, order.OrderId, order.Amount, order.ActualAmount, order.Token, order.CreatedAt.ToDateTimeString(), carbon.Now().ToDateTimeString())
+		telegram.SendToBot(msg)
 	}
 }

src/mq/handle/order_expiration_queue.go

@@ -2,7 +2,6 @@ package handle
 
 import (
 	"context"
-	"fmt"
 	"github.com/assimon/luuu/model/data"
 	"github.com/assimon/luuu/model/mdb"
 	"github.com/hibiken/asynq"
@@ -28,8 +27,7 @@ func OrderExpirationHandle(ctx context.Context, t *asynq.Task) error {
 	if err != nil {
 		return err
 	}
-	actualAmount := fmt.Sprintf("%.4f", orderInfo.ActualAmount)
+	err = data.UnLockTransaction(orderInfo.Token, orderInfo.ActualAmount)
-	err = data.ClearPayCache(orderInfo.Token, actualAmount)
 	if err != nil {
 		return err
 	}

src/task/usdt_rate_job.go

@@ -1,12 +1,11 @@
 package task
 
 import (
-	"fmt"
 	"github.com/assimon/luuu/config"
 	"github.com/assimon/luuu/util/http_client"
 	"github.com/assimon/luuu/util/json"
 	"github.com/assimon/luuu/util/log"
-	"strconv"
+	"github.com/assimon/luuu/util/math"
 	"time"
 )
 
@@ -56,10 +55,7 @@ func (r UsdtRateJob) Run() {
 	}
 	for _, points := range usdtResp.Data.Points {
 		if len(points.C) > 0 && points.C[0] > 0 {
-			config.UsdtRate, err = strconv.ParseFloat(fmt.Sprintf("%.2f", points.C[0]), 64)
+			config.UsdtRate = math.MustParsePrecFloat64(points.C[0], 2)
-			if err != nil {
-				log.Sugar.Error("Calculate UsdtRate err:", err.Error())
-			}
 			return
 		}
 	}

src/util/math/math.go

@@ -0,0 +1,16 @@
+package math
+
+import (
+	"fmt"
+	"strconv"
+)
+
+// MustParsePrecFloat64 按小数位截取float
+func MustParsePrecFloat64(value float64, prec int) float64 {
+	format := fmt.Sprintf("%%.%df", prec)
+	v, err := strconv.ParseFloat(fmt.Sprintf(format, value), 64)
+	if err != nil {
+		return 0
+	}
+	return v
+}