feat(cex_rates): implementation backend of #326

src/atomic.dex.app.cpp

@@ -1156,6 +1156,17 @@ namespace atomic_dex
     }
 } // namespace atomic_dex
 
+//! Trading functions
+namespace atomic_dex
+{
+    QString
+    application::get_cex_rates(const QString& base, const QString& rel)
+    {
+        std::error_code ec;
+        return QString::fromStdString(get_paprika().get_cex_rates(base.toStdString(), rel.toStdString(), ec));
+    }
+}
+
 //! OHLC Relative functions
 namespace atomic_dex
 {

src/atomic.dex.app.hpp

@@ -173,6 +173,7 @@ namespace atomic_dex
         Q_INVOKABLE QObject*     claim_rewards(const QString& ticker);
         Q_INVOKABLE QVariantList get_ohlc_data(const QString& range);
         Q_INVOKABLE QVariantMap  find_closest_ohlc_data(int range, int timestamp);
+        Q_INVOKABLE QString      get_cex_rates(const QString& base, const QString& rel);
 
         Q_INVOKABLE bool is_supported_ohlc_data_ticker_pair(const QString& base, const QString& rel);
         Q_INVOKABLE QObject*    get_coin_info(const QString& ticker);

src/atomic.dex.provider.coinpaprika.cpp

@@ -402,5 +402,32 @@ namespace atomic_dex
         return m_ticker_historical_registry.find(ticker) != m_ticker_historical_registry.cend() ? m_ticker_historical_registry.at(ticker)
                                                                                                 : t_ticker_historical_answer{.answer = nlohmann::json::array()};
     }
-
+
+    std::string
+    coinpaprika_provider::get_cex_rates(const std::string& base, const std::string& rel, std::error_code& ec) const noexcept
+    {
+        std::string base_rate_str = get_rate_conversion("USD", base, ec, false);
+        if (ec)
+        {
+            return "0.00";
+        }
+        std::string rel_rate_str = get_rate_conversion("USD", rel, ec, false);
+        if (ec)
+        {
+            return "0.00";
+        }
+        if (base_rate_str == "0.00" || rel_rate_str == "0.00")
+        {
+            //! One of the rate is not available
+            return "0.00";
+        }
+        t_float_50  base_rate_f(base_rate_str);
+        t_float_50  rel_rate_f(rel_rate_str);
+        t_float_50  result     = base_rate_f / rel_rate_f;
+        std::string result_str = result.str(8, std::ios_base::fixed);
+        boost::trim_right_if(result_str, boost::is_any_of("0"));
+        boost::trim_right_if(result_str, boost::is_any_of("."));
+        return result_str;
+    }
+
 } // namespace atomic_dex

src/atomic.dex.provider.coinpaprika.hpp

@@ -70,6 +70,9 @@ namespace atomic_dex
         //! Get the price in fiat from a transaction.
         std::string get_price_in_fiat_from_tx(const std::string& fiat, const std::string& ticker, const tx_infos& tx, std::error_code& ec) const noexcept;
 
+        //! Get the cex rates base / rel eg: VRSC / KMD = price of usd VRSC / KMD price USD
+        std::string get_cex_rates(const std::string& base, const std::string& rel, std::error_code& ec) const noexcept;
+
         //! Get the ticker informations.
         t_ticker_info_answer get_ticker_infos(const std::string& ticker) const noexcept;