Here’s a commit message that summarizes the changes from your diff:

---

**feat(infrastructure): unify and extend notifier interface; generalize infra components**

* Introduced unified `InfrastructureInterface` and `InfrastructureNotifierInterface` for Binance and Bybit with support for `StartAsync()` and `StopAsync()`.
* Added optional support for BestBidPrice and BestAskPrice notifications via `SetCallbackOnBestBidPriceChange()` and `SetCallbackOnBestAskPriceChange()`.
* Refactored `OrderBookInfraContext` to be templated, replacing previously duplicated `OrderBookInfraContextDefault`.
* Introduced `InfrastructureImpl` template to replace spot/futures-specific `Infrastructure` classes, supporting flexible injection of `OrderBookSync`, `Listener`, and `Session` types.
* Replaced hardcoded notifier creation and registration with conditional logic based on `NotifierFlags`.
* Added namespace aliases for `spot::main_net` and `futures::main_net` for better clarity and reuse.
* Extended all WebSocket session classes to implement `StartAsync()` and `StopAsync()` methods through the `SessionInterface`.

---

Let me know if you want to split this into multiple commits or adjust the tone.

Author: linoxoidunix

aoe/binance/infrastructure/i_infrastructure.h

@@ -2,34 +2,24 @@
 #include "aos/best_ask/best_ask.h"
 #include "aos/best_bid/best_bid.h"
 #include "aos/trading_pair/trading_pair.h"
+
 namespace aoe {
 namespace binance {
-namespace spot {
-namespace main_net {
+
+// Общий базовый интерфейс инфраструктуры
 class InfrastructureInterface {
   public:
     virtual ~InfrastructureInterface()                   = default;
     virtual void Register(aos::TradingPair trading_pair) = 0;
+    virtual void StartAsync()                            = 0;
+    virtual void StopAsync()                             = 0;
 };
 
+// Шаблонный интерфейс уведомлений по изменению best bid/ask
 template <typename Price, typename Qty>
 class InfrastructureNotifierOnBestBidChangeInterface {
   public:
     virtual ~InfrastructureNotifierOnBestBidChangeInterface() = default;
-    /**
-     * @brief Sets a callback to be invoked on best bid changes for a trading
-     * pair.
-     *
-     * If a context exists for the specified trading pair, the callback will be
-     * registered and the method returns true. Otherwise, no callback is
-     * registered and the method returns false.
-     *
-     * @param cb The callback function to be called when the best bid changes.
-     *           It receives the trading pair and the updated best bid as
-     * arguments.
-     * @return true if the context for the trading pair exists and the callback
-     * was set; false otherwise.
-     */
     virtual bool SetCallbackOnBestBidChange(
         aos::TradingPair trading_pair,
         std::function<void(aos::BestBid<Price, Qty>& new_bid)> cb) = 0;
@@ -39,97 +29,58 @@ template <typename Price, typename Qty>
 class InfrastructureNotifierOnBestAskChangeInterface {
   public:
     virtual ~InfrastructureNotifierOnBestAskChangeInterface() = default;
-    /**
-     * @brief Sets a callback to be invoked on best ask changes for a trading
-     * pair.
-     *
-     * If a context exists for the specified trading pair, the callback will be
-     * registered and the method returns true. Otherwise, no callback is
-     * registered and the method returns false.
-     *
-     * @param cb The callback function to be called when the best ask changes.
-     *           It receives the trading pair and the updated best ask as
-     * arguments.
-     * @return true if the context for the trading pair exists and the callback
-     * was set; false otherwise.
-     */
     virtual bool SetCallbackOnBestAskChange(
         aos::TradingPair trading_pair,
         std::function<void(aos::BestAsk<Price, Qty>& new_ask)> cb) = 0;
 };
 
-template <typename Price, typename Qty>
-class InfrastructureNotifierInterface
-    : public InfrastructureNotifierOnBestBidChangeInterface<Price, Qty>,
-      public InfrastructureNotifierOnBestAskChangeInterface<Price, Qty> {
-  public:
-    ~InfrastructureNotifierInterface() override = default;
-};
-};  // namespace main_net
-};  // namespace spot
-
-namespace futures {
-namespace main_net {
-class InfrastructureInterface {
-  public:
-    virtual ~InfrastructureInterface()                   = default;
-    virtual void Register(aos::TradingPair trading_pair) = 0;
-};
-
-template <typename Price, typename Qty>
-class InfrastructureNotifierOnBestBidChangeInterface {
+template <typename Price>
+class InfrastructureNotifierOnBestBidPriceChangeInterface {
   public:
-    virtual ~InfrastructureNotifierOnBestBidChangeInterface() = default;
-    /**
-     * @brief Sets a callback to be invoked on best bid changes for a trading
-     * pair.
-     *
-     * If a context exists for the specified trading pair, the callback will be
-     * registered and the method returns true. Otherwise, no callback is
-     * registered and the method returns false.
-     *
-     * @param cb The callback function to be called when the best bid changes.
-     *           It receives the trading pair and the updated best bid as
-     * arguments.
-     * @return true if the context for the trading pair exists and the callback
-     * was set; false otherwise.
-     */
-    virtual bool SetCallbackOnBestBidChange(
+    virtual ~InfrastructureNotifierOnBestBidPriceChangeInterface() = default;
+    virtual bool SetCallbackOnBestBidPriceChange(
         aos::TradingPair trading_pair,
-        std::function<void(aos::BestBid<Price, Qty>& new_bid)> cb) = 0;
+        std::function<void(Price& new_bid_price)> cb) = 0;
 };
 
-template <typename Price, typename Qty>
-class InfrastructureNotifierOnBestAskChangeInterface {
+template <typename Price>
+class InfrastructureNotifierOnBestAskPriceChangeInterface {
   public:
-    virtual ~InfrastructureNotifierOnBestAskChangeInterface() = default;
-    /**
-     * @brief Sets a callback to be invoked on best ask changes for a trading
-     * pair.
-     *
-     * If a context exists for the specified trading pair, the callback will be
-     * registered and the method returns true. Otherwise, no callback is
-     * registered and the method returns false.
-     *
-     * @param cb The callback function to be called when the best ask changes.
-     *           It receives the trading pair and the updated best ask as
-     * arguments.
-     * @return true if the context for the trading pair exists and the callback
-     * was set; false otherwise.
-     */
-    virtual bool SetCallbackOnBestAskChange(
+    virtual ~InfrastructureNotifierOnBestAskPriceChangeInterface() = default;
+    virtual bool SetCallbackOnBestAskPriceChange(
         aos::TradingPair trading_pair,
-        std::function<void(aos::BestAsk<Price, Qty>& new_ask)> cb) = 0;
+        std::function<void(Price& new_ask_price)> cb) = 0;
 };
 
+// Объединённый интерфейс уведомлений
 template <typename Price, typename Qty>
 class InfrastructureNotifierInterface
     : public InfrastructureNotifierOnBestBidChangeInterface<Price, Qty>,
-      public InfrastructureNotifierOnBestAskChangeInterface<Price, Qty> {
+      public InfrastructureNotifierOnBestAskChangeInterface<Price, Qty>,
+      public InfrastructureNotifierOnBestBidPriceChangeInterface<Price>,
+      public InfrastructureNotifierOnBestAskPriceChangeInterface<Price> {
   public:
     ~InfrastructureNotifierInterface() override = default;
 };
-};  // namespace main_net
-};  // namespace futures
-};  // namespace binance
-};  // namespace aoe
+
+// Пространство имён для Spot и Futures с alias-ами
+namespace spot {
+namespace main_net {
+using Infrastructure = InfrastructureInterface;
+template <typename Price, typename Qty>
+using InfrastructureNotifierInterface =
+    InfrastructureNotifierInterface<Price, Qty>;
+}  // namespace main_net
+}  // namespace spot
+
+namespace futures {
+namespace main_net {
+using Infrastructure = InfrastructureInterface;
+template <typename Price, typename Qty>
+using InfrastructureNotifierInterface =
+    InfrastructureNotifierInterface<Price, Qty>;
+}  // namespace main_net
+}  // namespace futures
+
+}  // namespace binance
+}  // namespace aoe