Tight validation coupling.

include/bitcoin/node/chase.hpp

@@ -91,6 +91,9 @@ enum class chase
     /// Check/Identify.
     /// -----------------------------------------------------------------------
 
+    /////// A set of blocks is being checked, top block provided (height_t).
+    ////checking,
+
     /// A block has been downloaded, checked and stored (height_t).
     /// Issued by 'block_in_31800' or 'populate' and handled by 'connect'.
     /// Populate is bypassed for checkpoint/milestone blocks.

include/bitcoin/node/chasers/chaser_check.hpp

@@ -68,6 +68,7 @@ class BCN_API chaser_check
     virtual void do_get_hashes(const map_handler& handler) NOEXCEPT;
     virtual void do_put_hashes(const map_ptr& map,
         const network::result_handler& handler) NOEXCEPT;
+    virtual void do_confirmable(height_t height) NOEXCEPT;
 
 private:
     typedef std::deque<map_ptr> maps;
@@ -89,6 +90,7 @@ class BCN_API chaser_check
     // These are protected by strand.
     size_t inventory_{};
     size_t requested_{};
+    size_t confirmed_{};
     job::ptr job_{};
     maps maps_{};
 };

include/bitcoin/node/chasers/chaser_confirm.hpp

@@ -50,10 +50,14 @@ class BCN_API chaser_confirm
     virtual bool handle_event(const code& ec, chase event_,
         event_value value) NOEXCEPT;
 
+    ////virtual void do_checking(height_t height) NOEXCEPT;
+    virtual void do_regressed(height_t branch_point) NOEXCEPT;
     virtual void do_validated(height_t height) NOEXCEPT;
-    virtual void do_reorganize(header_links& fork, size_t fork_point) NOEXCEPT;
-    virtual void do_organize(header_links& fork, const header_links& popped,
-        size_t fork_point) NOEXCEPT;
+    virtual void do_bump(height_t branch_point) NOEXCEPT;
+
+    ////virtual void do_reorganize(header_links& fork, size_t fork_point) NOEXCEPT;
+    ////virtual void do_organize(header_links& fork, const header_links& popped,
+    ////    size_t fork_point) NOEXCEPT;
 
 private:
     bool set_organized(const database::header_link& link,

src/chasers/chaser_check.cpp

@@ -130,6 +130,12 @@ bool chaser_check::handle_event(const code&, chase event_,
             POST(do_headers, std::get<height_t>(value));
             break;
         }
+        case chase::confirmable:
+        {
+            BC_ASSERT(std::holds_alternative<height_t>(value));
+            POST(do_confirmable, std::get<height_t>(value));
+            break;
+        }
         case chase::stop:
         {
             return false;
@@ -143,6 +149,15 @@ bool chaser_check::handle_event(const code&, chase event_,
     return true;
 }
 
+void chaser_check::do_confirmable(height_t height) NOEXCEPT
+{
+    BC_ASSERT(stranded());
+    confirmed_ = height;
+
+    if (confirmed_ == requested_)
+        do_headers(height_t{});
+}
+
 // regression
 // ----------------------------------------------------------------------------
 
@@ -223,7 +238,7 @@ void chaser_check::do_bump(height_t) NOEXCEPT
         query.to_candidate(add1(position()))))
             set_position(add1(position()));
 
-    set_unassociated();
+    do_headers(height_t{});
 }
 
 // add headers
@@ -324,8 +339,10 @@ size_t chaser_check::set_unassociated() NOEXCEPT
     if (closed() || purging())
         return {};
 
-    // Defer new work issuance until all gaps are filled.
-    if (position() < requested_ || requested_ >= maximum_height_)
+    // Defer new work issuance until gaps filled and confirmation caught up.
+    if (position() < requested_ ||
+        requested_ >= maximum_height_ ||
+        confirmed_ < requested_)
         return {};
 
     // Inventory size gets set only once.
@@ -364,6 +381,7 @@ size_t chaser_check::set_unassociated() NOEXCEPT
         << count << ") last ("
         << requested_ << ").");
 
+    ////notify(error::success, chase::checking, requested_);
     return count;
 }