feature: indicate average speed of appending while fast syncing

Signed-off-by: Dmitriy Khaustov aka xDimon <khaustov.dm@gmail.com>

core/consensus/babe/impl/block_appender_impl.cpp

@@ -246,17 +246,26 @@ namespace kagome::consensus {
       }
     }
 
-    SL_DEBUG(logger_,
-             "Imported header of block {} within {} us",
-             block_info,
-             std::chrono::duration_cast<std::chrono::microseconds>(
-                 std::chrono::high_resolution_clock::now() - t_start)
-                 .count());
+    auto now = std::chrono::high_resolution_clock::now();
+
+    SL_DEBUG(
+        logger_,
+        "Imported header of block {} within {} us",
+        block_info,
+        std::chrono::duration_cast<std::chrono::microseconds>(now - t_start)
+            .count());
 
-    if (block_info.number % 512 == 0) {
+    auto block_delta = block_info.number - speed_data_.block_number;
+    auto time_delta = now - speed_data_.time;
+    if (block_delta >= 25000 or time_delta >= std::chrono::minutes(1)) {
       SL_INFO(logger_,
-              "Imported another 512 headers of blocks. Last one imported is {}",
-              block_info);
+              "Imported {} more headers of blocks. Average speed is {} bps",
+              block_delta,
+              block_delta
+                  / std::chrono::duration_cast<std::chrono::seconds>(time_delta)
+                        .count());
+      speed_data_.block_number = block_info.number;
+      speed_data_.time = now;
     }
 
     consistency_guard.commit();

core/consensus/babe/impl/block_appender_impl.hpp

@@ -65,6 +65,11 @@ namespace kagome::consensus {
     // Justification Store for Future Applying
     std::map<primitives::BlockInfo, primitives::Justification> justifications_;
 
+    struct {
+      std::chrono::high_resolution_clock::time_point time;
+      primitives::BlockNumber block_number;
+    } speed_data_;
+
     log::Logger logger_;
   };