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。
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208
webapp-back/lending/snapshot.go
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208
webapp-back/lending/snapshot.go
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package lending
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import (
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"context"
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"fmt"
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"log"
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"math/big"
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"strings"
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"time"
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"github.com/ethereum/go-ethereum"
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"github.com/ethereum/go-ethereum/accounts/abi"
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ethcommon "github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/ethclient"
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appcfg "github.com/gothinkster/golang-gin-realworld-example-app/config"
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db "github.com/gothinkster/golang-gin-realworld-example-app/common"
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"github.com/gothinkster/golang-gin-realworld-example-app/models"
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"gorm.io/gorm"
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)
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const lendingSnapshotInterval = 15 * time.Minute
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// Only the 4 view functions needed for APY snapshot
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const lendingRateABIJSON = `[
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{"inputs":[],"name":"getSupplyRate","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},
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{"inputs":[],"name":"getBorrowRate","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},
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{"inputs":[],"name":"getTotalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},
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{"inputs":[],"name":"getTotalBorrow","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}
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]`
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// StartLendingAPYSnapshot starts the hourly lending APY snapshot background service.
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// Call as: go lending.StartLendingAPYSnapshot(cfg)
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func StartLendingAPYSnapshot(cfg *appcfg.Config) {
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log.Println("=== Lending APY Snapshot Service Started (interval: 15min) ===")
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runLendingSnapshot(cfg)
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ticker := time.NewTicker(lendingSnapshotInterval)
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defer ticker.Stop()
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for range ticker.C {
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runLendingSnapshot(cfg)
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}
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}
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func runLendingSnapshot(cfg *appcfg.Config) {
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start := time.Now()
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log.Printf("[LendingSnapshot] Starting at %s", start.Format("2006-01-02 15:04:05"))
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database := db.GetDB()
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// Load lendingProxy contracts from system_contracts
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var lendingContracts []struct {
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Name string `gorm:"column:name"`
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ChainID int `gorm:"column:chain_id"`
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Address string `gorm:"column:address"`
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}
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if err := database.Table("system_contracts").
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Where("name = ? AND is_active = ?", "lendingProxy", true).
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Select("name, chain_id, address").
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Find(&lendingContracts).Error; err != nil {
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log.Printf("[LendingSnapshot] Load lendingProxy error: %v", err)
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return
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}
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if len(lendingContracts) == 0 {
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log.Println("[LendingSnapshot] No lendingProxy in system_contracts, skipping")
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return
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}
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var usdcAsset models.Asset
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if err := database.Where("asset_code = ?", "USDC").First(&usdcAsset).Error; err != nil {
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log.Printf("[LendingSnapshot] USDC asset not found in assets table: %v", err)
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return
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}
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parsedABI, err := abi.JSON(strings.NewReader(lendingRateABIJSON))
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if err != nil {
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log.Printf("[LendingSnapshot] Parse ABI error: %v", err)
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return
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}
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for _, lc := range lendingContracts {
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if lc.Address == "" {
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log.Printf("[LendingSnapshot] lendingProxy chain_id=%d has no address, skipping", lc.ChainID)
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continue
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}
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rpcURL := getRPCURL(lc.ChainID)
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if rpcURL == "" {
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log.Printf("[LendingSnapshot] lendingProxy unsupported chain_id=%d, skipping", lc.ChainID)
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continue
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}
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if err := snapshotLendingMarket(database, parsedABI, rpcURL, lc.Address, lc.ChainID, usdcAsset); err != nil {
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log.Printf("[LendingSnapshot] lendingProxy chain_id=%d error: %v", lc.ChainID, err)
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}
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}
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log.Printf("[LendingSnapshot] Done in %v", time.Since(start))
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}
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func snapshotLendingMarket(
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database *gorm.DB,
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parsedABI abi.ABI,
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rpcURL, contractAddr string,
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chainID int,
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usdcAsset models.Asset,
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) error {
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ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
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defer cancel()
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client, err := ethclient.DialContext(ctx, rpcURL)
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if err != nil {
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return fmt.Errorf("dial rpc: %w", err)
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}
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defer client.Close()
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addr := ethcommon.HexToAddress(contractAddr)
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// Generic call helper: packs, calls, unpacks, returns *big.Int
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call := func(name string) (*big.Int, error) {
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data, err := parsedABI.Pack(name)
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if err != nil {
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return nil, fmt.Errorf("pack %s: %w", name, err)
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}
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result, err := client.CallContract(ctx, ethereum.CallMsg{To: &addr, Data: data}, nil)
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if err != nil {
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return nil, fmt.Errorf("call %s: %w", name, err)
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}
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decoded, err := parsedABI.Unpack(name, result)
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if err != nil {
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return nil, fmt.Errorf("unpack %s: %w", name, err)
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}
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if len(decoded) == 0 {
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return nil, fmt.Errorf("%s: empty result", name)
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}
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switch v := decoded[0].(type) {
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case uint64:
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return new(big.Int).SetUint64(v), nil
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case *big.Int:
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return v, nil
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default:
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return nil, fmt.Errorf("%s: unexpected type %T", name, decoded[0])
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}
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}
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supplyRateRaw, err := call("getSupplyRate")
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if err != nil {
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return err
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}
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borrowRateRaw, err := call("getBorrowRate")
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if err != nil {
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return err
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}
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totalSupplyRaw, err := call("getTotalSupply")
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if err != nil {
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return err
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}
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totalBorrowRaw, err := call("getTotalBorrow")
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if err != nil {
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return err
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}
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// APR% = rate / 1e18 * 100
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// This contract's getSupplyRate/getBorrowRate already return annualized rate (APR × 1e18),
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// NOT per-second rate. Do NOT multiply by secondsPerYear.
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toAPRPct := func(raw *big.Int) float64 {
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f, _ := new(big.Float).SetPrec(256).Quo(
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new(big.Float).SetPrec(256).SetInt(raw),
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new(big.Float).SetPrec(256).SetFloat64(1e18),
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).Float64()
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return f * 100
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}
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usdcDec := int64(usdcAsset.Decimals)
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totalSupply := lendingBigIntToFloat(totalSupplyRaw, usdcDec)
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totalBorrow := lendingBigIntToFloat(totalBorrowRaw, usdcDec)
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supplyAPR := toAPRPct(supplyRateRaw)
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borrowAPR := toAPRPct(borrowRateRaw)
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log.Printf("[LendingSnapshot] supply=%.4f USDC, borrow=%.4f USDC, utilization=%.2f%%, supplyAPR=%.4f%%, borrowAPR=%.4f%%",
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totalSupply, totalBorrow,
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func() float64 {
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if totalSupply == 0 {
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return 0
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}
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return totalBorrow / totalSupply * 100
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}(),
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supplyAPR, borrowAPR,
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)
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snap := models.APYSnapshot{
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AssetID: usdcAsset.ID,
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ChainID: chainID,
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ContractAddress: contractAddr,
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SupplyAPY: supplyAPR,
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BorrowAPY: borrowAPR,
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TotalAssets: totalSupply, // total USDC deposited
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TotalSupply: totalBorrow, // total USDC borrowed
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SnapshotTime: time.Now(),
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}
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return database.Create(&snap).Error
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}
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// lendingBigIntToFloat converts *big.Int to float64 by dividing by 10^decimals
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func lendingBigIntToFloat(n *big.Int, decimals int64) float64 {
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divisor := new(big.Int).Exp(big.NewInt(10), big.NewInt(decimals), nil)
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f, _ := new(big.Float).SetPrec(256).Quo(
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new(big.Float).SetPrec(256).SetInt(n),
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new(big.Float).SetPrec(256).SetInt(divisor),
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).Float64()
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return f
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}
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