79 lines
2.3 KiB
Go
79 lines
2.3 KiB
Go
package paraswap
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import (
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"context"
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"encoding/json"
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"errors"
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"math/big"
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netUrl "net/url"
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"strconv"
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"github.com/ethereum/go-ethereum/common"
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"github.com/status-im/status-go/services/wallet/bigint"
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)
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const pricesURL = "https://apiv5.paraswap.io/prices"
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type Route struct {
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GasCost *bigint.BigInt `json:"gasCost"`
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SrcAmount *bigint.BigInt `json:"srcAmount"`
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SrcTokenAddress common.Address `json:"srcToken"`
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SrcTokenDecimals uint `json:"srcDecimals"`
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DestAmount *bigint.BigInt `json:"destAmount"`
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DestTokenAddress common.Address `json:"destToken"`
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DestTokenDecimals uint `json:"destDecimals"`
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RawPriceRoute json.RawMessage `json:"rawPriceRoute"`
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}
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type PriceRouteResponse struct {
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PriceRoute json.RawMessage `json:"priceRoute"`
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Error string `json:"error"`
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}
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func (c *ClientV5) FetchPriceRoute(ctx context.Context, srcTokenAddress common.Address, srcTokenDecimals uint,
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destTokenAddress common.Address, destTokenDecimals uint, amountWei *big.Int, addressFrom common.Address,
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addressTo common.Address) (Route, error) {
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params := netUrl.Values{}
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params.Add("srcToken", srcTokenAddress.Hex())
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params.Add("srcDecimals", strconv.Itoa(int(srcTokenDecimals)))
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params.Add("destToken", destTokenAddress.Hex())
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params.Add("destDecimals", strconv.Itoa(int(destTokenDecimals)))
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params.Add("userAddress", addressFrom.Hex())
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// params.Add("receiver", addressTo.Hex()) // at this point paraswap doesn't allow swap and transfer transaction
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params.Add("network", strconv.FormatUint(c.chainID, 10))
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params.Add("amount", amountWei.String())
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params.Add("side", "SELL")
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url := pricesURL
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response, err := c.httpClient.DoGetRequest(ctx, url, params)
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if err != nil {
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return Route{}, err
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}
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return handlePriceRouteResponse(response)
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}
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func handlePriceRouteResponse(response []byte) (Route, error) {
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var priceRouteResponse PriceRouteResponse
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err := json.Unmarshal(response, &priceRouteResponse)
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if err != nil {
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return Route{}, err
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}
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if priceRouteResponse.Error != "" {
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return Route{}, errors.New(priceRouteResponse.Error)
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}
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var route Route
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err = json.Unmarshal(priceRouteResponse.PriceRoute, &route)
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if err != nil {
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return Route{}, err
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}
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route.RawPriceRoute = priceRouteResponse.PriceRoute
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return route, nil
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}
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