bot.hpp

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#pragma once
 
#include <utils.hpp>
 
namespace TransactionDataBuilder {
  inline constexpr char const * DataBoilerplate { "7ff36ab5000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff0000000000000000000000000000000000000000000000000000000000000002000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc20000000000000000000000000000000000000000000000000000000000000000" };
 
  inline constexpr std::size_t DataLength { std::char_traits<char>::length(DataBoilerplate) };
 
  inline std::size_t buildData(const char *amountOutMin, const char *targetTokenAddress, const char *receiverAddress, char *output) {
    std::size_t amountOutMinLength = strlen(amountOutMin);
 
    memcpy(output, DataBoilerplate, DataLength);
    memcpy(output + 8 + 64 - amountOutMinLength, amountOutMin, amountOutMinLength);
    memcpy(output + 8 + 3 * 64 - 40, receiverAddress, 40);
    memcpy(output + 8 + 7 * 64 - 40, targetTokenAddress, 40);
 
    output[DataLength] = '\0';
 
    return DataLength;
  }
}
 
namespace BloXrouteMessageParser {
  inline constexpr std::size_t MethodPosition = 37;
 
  inline constexpr std::size_t TokenPosition = 179;
 
  inline constexpr std::size_t GasPricePosition = 555;
 
  inline bool validateTransaction(const char *message, const char *targetTokenAddress) {
    return 
         memcmp(message + MethodPosition, "subscribe", 9) == 0
      && memcmp(message + TokenPosition, targetTokenAddress, 40) == 0;
  }
 
  inline std::size_t extractGasPrice(const char *message, char *output) {
    const char *gasPriceStart = message + GasPricePosition;
    const char *gasPriceEnd = strchr(gasPriceStart, '\"');
    std::size_t gasPriceLength = gasPriceEnd - gasPriceStart;
 
    memcpy(output, gasPriceStart, gasPriceLength);
    output[gasPriceLength] = '\0';
 
    return gasPriceLength;
  }
}
 
namespace BloXrouteMessageBuilder {
  inline std::size_t buildSubscribe(const char *minimumLiquidityETH, const char *maximumGasPrice, char *output) {
    strcpy(output, "{\"method\":\"subscribe\",\"params\":[\"newTxs\",{\"include\":[\"tx_contents.input\",\"tx_contents.gas_price\"],\"filters\":\"method_id = f305d719 and to = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D and value >= ");
    strcat(output, minimumLiquidityETH);
    strcat(output, " and gas_price <= ");
    strcat(output, maximumGasPrice);
    strcat(output, "\"}]}");
 
    return strlen(output);
  }
 
  inline std::size_t buildTransaction(const char *rawTransaction, char *output) {
    strcpy(output, "{\"method\":\"blxr_tx\",\"params\":{\"transaction\":\"");
    strcat(output, rawTransaction);
    strcat(output, "\"}}");
 
    return strlen(output);
  }
}