3SF & Fork-choice

DEPRECATED.md

@@ -1,3 +1,10 @@
+[Spec](https://github.com/leanEthereum/leanSpec) uses names like
+`get_vote_target`,\
+but they should be converted to `getVoteTarget`.\
+Yes, text search doesn't work.
+
+---
+
 Module system uses subscriptions and messages.\
 For example:
 

src/app/impl/timeline_impl.cpp

@@ -49,7 +49,10 @@ namespace lean::app {
 
   void TimelineImpl::start() {
     auto now = clock_->nowMsec();
-    auto next_slot = (now - config_->genesis_time) / SLOT_DURATION_MS + 1;
+    auto next_slot = now > config_->genesis_time  // somehow now could be less
+                                                  // than genesis time
+                       ? (now - config_->genesis_time) / SLOT_DURATION_MS + 1
+                       : 1;
     auto time_to_next_slot =
         config_->genesis_time + SLOT_DURATION_MS * next_slot - now;
     if (time_to_next_slot < SLOT_DURATION_MS / 2) {
@@ -82,7 +85,28 @@ namespace lean::app {
     auto time_to_next_slot =
         config_->genesis_time + SLOT_DURATION_MS * next_slot - now;
 
-    SL_INFO(logger_, "Next slot is {} in {}ms", msg->slot, time_to_next_slot);
+    SL_INFO(logger_, "Next slot is {} in {}ms", next_slot, time_to_next_slot);
+
+    auto time_to_interval_1 = SECONDS_PER_INTERVAL * 1000;
+    se_manager_->notifyDelayed(
+        std::chrono::milliseconds(time_to_interval_1),
+        EventTypes::SlotIntervalOneStarted,
+        std::make_shared<const messages::SlotIntervalOneStarted>(msg->slot,
+                                                                 msg->epoch));
+
+    auto time_to_interval_2 = 2 * SECONDS_PER_INTERVAL * 1000;
+    se_manager_->notifyDelayed(
+        std::chrono::milliseconds(time_to_interval_2),
+        EventTypes::SlotIntervalTwoStarted,
+        std::make_shared<const messages::SlotIntervalTwoStarted>(msg->slot,
+                                                                 msg->epoch));
+
+    auto time_to_interval_3 = 3 * SECONDS_PER_INTERVAL * 1000;
+    se_manager_->notifyDelayed(
+        std::chrono::milliseconds(time_to_interval_3),
+        EventTypes::SlotIntervalThreeStarted,
+        std::make_shared<const messages::SlotIntervalThreeStarted>(msg->slot,
+                                                                   msg->epoch));
 
     se_manager_->notifyDelayed(
         std::chrono::milliseconds(time_to_next_slot),

src/blockchain/CMakeLists.txt

@@ -5,11 +5,13 @@
 #
 
 add_library(blockchain
+    fork_choice.cpp
     impl/block_storage_error.cpp
     impl/block_storage_impl.cpp
     impl/block_storage_initializer.cpp
     impl/block_tree_error.cpp
     impl/block_tree_impl.cpp
+    impl/fc_block_tree.cpp
     impl/block_tree_initializer.cpp
     impl/cached_tree.cpp
     impl/genesis_block_header_impl.cpp