Tomar precios directamente de OpenSea
No sabía que existía total_price
This commit is contained in:
parent
8a5dace926
commit
cd9650368e
3 changed files with 42 additions and 71 deletions
50
etherscan.go
50
etherscan.go
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@ -1,50 +0,0 @@
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package main
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import (
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"encoding/json"
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"errors"
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"math"
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"net/http"
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"os"
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"strconv"
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)
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type Transaction struct {
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Value float64
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}
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func GetTransaction(id string) (Transaction, error) {
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transaction := Transaction{}
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key, exists := os.LookupEnv("ETHERSCAN_KEY")
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if !exists {
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return transaction, errors.New("No tengo ETHERSCAN_KEY, conseguir en https://etherscan.io/apis")
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}
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res, err := http.DefaultClient.Get("https://api.etherscan.io/api?module=proxy" +
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"&action=eth_getTransactionByHash" +
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"&txhash=" + id +
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"&apikey=" + key)
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if err != nil {
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return transaction, err
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}
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result := struct {
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Result struct {
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Value string `json:"value"`
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} `json:"result,omitempty"`
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Error struct {
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Message string `json:"message"`
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} `json:"error,omitempty"`
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}{}
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err = json.NewDecoder(res.Body).Decode(&result)
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if err != nil {
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return transaction, err
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}
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if len(result.Error.Message) > 0 {
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return transaction, errors.New(result.Error.Message)
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}
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parsed, err := strconv.ParseUint(result.Result.Value[2:], 16, 64)
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if err != nil {
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return transaction, err
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}
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transaction.Value = float64(parsed) / math.Pow10(18)
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return transaction, nil
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}
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16
main.go
16
main.go
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@ -102,18 +102,17 @@ func getRandomOpenSeaAsset() (Asset, error) {
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type downloadedOpenSeaAsset struct {
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Id string `json:"Id"`
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Asset `json:"Asset"`
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Transaction `json:"Transaction"`
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FileName string `json:"FileName"`
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}
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func (d downloadedOpenSeaAsset) GetUSDPrice() float64 {
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return d.Transaction.Value * d.Asset.LastSale.TokenUSDPrice
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return d.Asset.LastSale.TotalPrice * d.Asset.LastSale.PaymentToken.USDPrice
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}
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func (d downloadedOpenSeaAsset) IsVideo() bool {
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return path.Ext(d.FileName) == ".mp4"
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}
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func downloadOpenSeaAsset(asset Asset, transaction Transaction) (string, error) {
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func downloadOpenSeaAsset(asset Asset) (string, error) {
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id := getOpenSeaId(asset.Id)
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u, err := url.Parse(asset.ImageUrl)
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@ -143,7 +142,6 @@ func downloadOpenSeaAsset(asset Asset, transaction Transaction) (string, error)
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err = json.NewEncoder(jsonFile).Encode(downloadedOpenSeaAsset{
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Id: id,
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Asset: asset,
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Transaction: transaction,
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FileName: filename,
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})
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if err != nil {
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@ -190,15 +188,7 @@ func main() {
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}
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log.Println(asset)
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transaction, err := GetTransaction(asset.LastSale.TransactionHash)
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if err != nil {
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log.Println("Error consiguiendo transacción de Etherscan", err)
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internalError(w, "Error hablandole a Etherscan.")
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return
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}
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log.Println(transaction)
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id, err := downloadOpenSeaAsset(asset, transaction)
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id, err := downloadOpenSeaAsset(asset)
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if err != nil {
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log.Println("Error descargando OpenSea asset", err)
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internalError(w, "Error descargando NFT.")
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35
opensea.go
35
opensea.go
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@ -2,6 +2,7 @@ package main
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import (
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"encoding/json"
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"math"
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"net/http"
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"strconv"
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)
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@ -17,8 +18,17 @@ type Asset struct {
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}
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type AssetLastSale struct {
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TokenUSDPrice float64
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TransactionHash string
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PaymentToken
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// TotalPrice has 16 decimals trimmed off if PaymentToken.decimals > 16
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TotalPrice float64
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}
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type PaymentToken struct {
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Id uint64
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Symbol string
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USDPrice float64
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Decimals int
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}
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// https://docs.opensea.io/reference/getting-assets
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@ -33,8 +43,12 @@ func GetAssets() (Assets, error) {
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ImageUrl string `json:"image_url"`
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Name string `json:"name"`
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LastSale struct {
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TotalPrice string `json:"total_price"`
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PaymentToken struct {
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Id uint64 `json:"id"`
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Symbol string `json:"symbol"`
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USDPrice string `json:"usd_price"`
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Decimals int `json:"decimals"`
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} `json:"payment_token"`
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Transaction struct {
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Hash string `json:"transaction_hash"`
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@ -60,6 +74,17 @@ func GetAssets() (Assets, error) {
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if err != nil {
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return assets, err
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}
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trimmed := a.LastSale.TotalPrice
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decimals := a.LastSale.PaymentToken.Decimals
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if a.LastSale.PaymentToken.Decimals > 16 {
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trimmed = trimmed[:len(trimmed)-16]
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decimals = decimals - 16
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}
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totalprice, err := strconv.ParseFloat(trimmed, 64)
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if err != nil {
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return assets, err
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}
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totalprice = totalprice / math.Pow10(decimals)
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assets = append(assets, Asset{
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Id: strconv.FormatUint(a.Id, 10),
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TokenId: a.TokenId,
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@ -67,7 +92,13 @@ func GetAssets() (Assets, error) {
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ImageUrl: a.ImageUrl,
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Name: a.Name,
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LastSale: AssetLastSale{
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TokenUSDPrice: tokenUSDPrice,
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TotalPrice: totalprice,
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PaymentToken: PaymentToken{
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Id: a.LastSale.PaymentToken.Id,
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Symbol: a.LastSale.PaymentToken.Symbol,
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Decimals: decimals,
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USDPrice: tokenUSDPrice,
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},
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TransactionHash: a.LastSale.Transaction.Hash,
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},
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})
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