init: 初始化 AssetX 项目仓库

包含 webapp（Next.js 用户端）、webapp-back（Go 后端）、
antdesign（管理后台）、landingpage（营销落地页）、
数据库 SQL 和配置文件。

webapp-back/fundmarket/earning.go

@@ -0,0 +1,93 @@
+package fundmarket
+
+import (
+	"math/big"
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+	db "github.com/gothinkster/golang-gin-realworld-example-app/common"
+)
+
+// GetNetDeposited computes the net USDC deposited by a wallet address across all YT vaults.
+//
+// GET /api/fundmarket/net-deposited?address=0x...&chain_id=97
+//
+// Net deposited = Σ(amountIn WHERE tokenIn=USDC) - Σ(amountOut WHERE tokenOut=USDC)
+// (buy YT: USDC → YT, tokenIn=USDC; sell YT: YT → USDC, tokenOut=USDC)
+//
+// Returns netDepositedUSD (float64) for the frontend to compute:
+//   Your Total Earning = currentValue (on-chain) - netDepositedUSD
+func GetNetDeposited(c *gin.Context) {
+	address := strings.ToLower(c.Query("address"))
+	if address == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"success": false, "error": "address required"})
+		return
+	}
+
+	chainIDStr := c.DefaultQuery("chain_id", "97")
+	database := db.GetDB()
+
+	// Look up USDC address for this chain (token_role = 'stablecoin')
+	var usdcAddr struct {
+		ContractAddress string `gorm:"column:contract_address"`
+	}
+	if err := database.Table("assets").
+		Where("token_role = 'stablecoin' AND chain_id = ?", chainIDStr).
+		Select("contract_address").
+		First(&usdcAddr).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"success": false, "error": "USDC address not found"})
+		return
+	}
+	usdcAddress := strings.ToLower(usdcAddr.ContractAddress)
+
+	// Sum amountIn where tokenIn = USDC (user bought YT, paid USDC)
+	type sumResult struct {
+		Total string
+	}
+	var buySum sumResult
+	database.Raw(`
+		SELECT COALESCE(SUM(CAST(amount_in AS DECIMAL(65,0))), 0) AS total
+		FROM yt_swap_records
+		WHERE account = ? AND chain_id = ? AND LOWER(token_in) = ?
+	`, address, chainIDStr, usdcAddress).Scan(&buySum)
+
+	// Sum amountOut where tokenOut = USDC (user sold YT, received USDC)
+	var sellSum sumResult
+	database.Raw(`
+		SELECT COALESCE(SUM(CAST(amount_out AS DECIMAL(65,0))), 0) AS total
+		FROM yt_swap_records
+		WHERE account = ? AND chain_id = ? AND LOWER(token_out) = ?
+	`, address, chainIDStr, usdcAddress).Scan(&sellSum)
+
+	buyWei, _ := new(big.Int).SetString(buySum.Total, 10)
+	sellWei, _ := new(big.Int).SetString(sellSum.Total, 10)
+	if buyWei == nil {
+		buyWei = big.NewInt(0)
+	}
+	if sellWei == nil {
+		sellWei = big.NewInt(0)
+	}
+
+	netWei := new(big.Int).Sub(buyWei, sellWei)
+	if netWei.Sign() < 0 {
+		netWei = big.NewInt(0)
+	}
+
+	// Convert from 18-decimal wei to float64 USD
+	divisor := new(big.Float).SetInt(new(big.Int).Exp(big.NewInt(10), big.NewInt(18), nil))
+	netUSD, _ := new(big.Float).Quo(new(big.Float).SetInt(netWei), divisor).Float64()
+
+	c.JSON(http.StatusOK, gin.H{
+		"success": true,
+		"data": gin.H{
+			"address":         address,
+			"chainId":         chainIDStr,
+			"usdcAddress":     usdcAddress,
+			"buyWei":          buyWei.String(),
+			"sellWei":         sellWei.String(),
+			"netDepositedWei": netWei.String(),
+			"netDepositedUSD": netUSD,
+		},
+	})
+}