Move sequential block/header validation to chasers.

Makefile.am

@@ -41,6 +41,7 @@ src_libbitcoin_node_la_SOURCES = \
     src/parser.cpp \
     src/settings.cpp \
     src/chasers/chaser.cpp \
+    src/chasers/chaser_block.cpp \
     src/chasers/chaser_candidate.cpp \
     src/chasers/chaser_check.cpp \
     src/chasers/chaser_confirm.cpp \
@@ -79,6 +80,7 @@ test_libbitcoin_node_test_SOURCES = \
     test/test.cpp \
     test/test.hpp \
     test/chasers/chaser.cpp \
+    test/chasers/chaser_block.cpp \
     test/chasers/chaser_candidate.cpp \
     test/chasers/chaser_check.cpp \
     test/chasers/chaser_confirm.cpp \
@@ -126,6 +128,7 @@ include_bitcoin_node_HEADERS = \
 include_bitcoin_node_chasersdir = ${includedir}/bitcoin/node/chasers
 include_bitcoin_node_chasers_HEADERS = \
     include/bitcoin/node/chasers/chaser.hpp \
+    include/bitcoin/node/chasers/chaser_block.hpp \
     include/bitcoin/node/chasers/chaser_candidate.hpp \
     include/bitcoin/node/chasers/chaser_check.hpp \
     include/bitcoin/node/chasers/chaser_confirm.hpp \

builds/cmake/CMakeLists.txt

@@ -274,6 +274,7 @@ add_library( ${CANONICAL_LIB_NAME}
     "../../src/parser.cpp"
     "../../src/settings.cpp"
     "../../src/chasers/chaser.cpp"
+    "../../src/chasers/chaser_block.cpp"
     "../../src/chasers/chaser_candidate.cpp"
     "../../src/chasers/chaser_check.cpp"
     "../../src/chasers/chaser_confirm.cpp"
@@ -348,6 +349,7 @@ if (with-tests)
         "../../test/test.cpp"
         "../../test/test.hpp"
         "../../test/chasers/chaser.cpp"
+        "../../test/chasers/chaser_block.cpp"
         "../../test/chasers/chaser_candidate.cpp"
         "../../test/chasers/chaser_check.cpp"
         "../../test/chasers/chaser_confirm.cpp"

builds/msvc/vs2022/libbitcoin-node-test/libbitcoin-node-test.vcxproj

@@ -71,6 +71,7 @@
   </ImportGroup>
   <ItemGroup>
     <ClCompile Include="..\..\..\..\test\chasers\chaser.cpp" />
+    <ClCompile Include="..\..\..\..\test\chasers\chaser_block.cpp" />
     <ClCompile Include="..\..\..\..\test\chasers\chaser_candidate.cpp" />
     <ClCompile Include="..\..\..\..\test\chasers\chaser_check.cpp" />
     <ClCompile Include="..\..\..\..\test\chasers\chaser_confirm.cpp" />

builds/msvc/vs2022/libbitcoin-node-test/libbitcoin-node-test.vcxproj.filters

@@ -24,6 +24,9 @@
     <ClCompile Include="..\..\..\..\test\chasers\chaser.cpp">
       <Filter>src\chasers</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\..\..\test\chasers\chaser_block.cpp">
+      <Filter>src\chasers</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\..\..\test\chasers\chaser_candidate.cpp">
       <Filter>src\chasers</Filter>
     </ClCompile>

builds/msvc/vs2022/libbitcoin-node/libbitcoin-node.vcxproj

@@ -74,6 +74,7 @@
   </ImportGroup>
   <ItemGroup>
     <ClCompile Include="..\..\..\..\src\chasers\chaser.cpp" />
+    <ClCompile Include="..\..\..\..\src\chasers\chaser_block.cpp" />
     <ClCompile Include="..\..\..\..\src\chasers\chaser_candidate.cpp" />
     <ClCompile Include="..\..\..\..\src\chasers\chaser_check.cpp" />
     <ClCompile Include="..\..\..\..\src\chasers\chaser_confirm.cpp" />
@@ -102,6 +103,7 @@
   <ItemGroup>
     <ClInclude Include="..\..\..\..\include\bitcoin\node.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\node\chasers\chaser.hpp" />
+    <ClInclude Include="..\..\..\..\include\bitcoin\node\chasers\chaser_block.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\node\chasers\chaser_candidate.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\node\chasers\chaser_check.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\node\chasers\chaser_confirm.hpp" />

builds/msvc/vs2022/libbitcoin-node/libbitcoin-node.vcxproj.filters

@@ -45,6 +45,9 @@
     <ClCompile Include="..\..\..\..\src\chasers\chaser.cpp">
       <Filter>src\chasers</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\..\..\src\chasers\chaser_block.cpp">
+      <Filter>src\chasers</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\..\..\src\chasers\chaser_candidate.cpp">
       <Filter>src\chasers</Filter>
     </ClCompile>
@@ -125,6 +128,9 @@
     <ClInclude Include="..\..\..\..\include\bitcoin\node\chasers\chaser.hpp">
       <Filter>include\bitcoin\node\chasers</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\..\include\bitcoin\node\chasers\chaser_block.hpp">
+      <Filter>include\bitcoin\node\chasers</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\..\..\include\bitcoin\node\chasers\chaser_candidate.hpp">
       <Filter>include\bitcoin\node\chasers</Filter>
     </ClInclude>

include/bitcoin/node.hpp

@@ -29,6 +29,7 @@
 #include <bitcoin/node/settings.hpp>
 #include <bitcoin/node/version.hpp>
 #include <bitcoin/node/chasers/chaser.hpp>
+#include <bitcoin/node/chasers/chaser_block.hpp>
 #include <bitcoin/node/chasers/chaser_candidate.hpp>
 #include <bitcoin/node/chasers/chaser_check.hpp>
 #include <bitcoin/node/chasers/chaser_confirm.hpp>

include/bitcoin/node/chasers/chaser.hpp

@@ -22,6 +22,7 @@
 #include <variant>
 #include <bitcoin/database.hpp>
 #include <bitcoin/network.hpp>
+#include <bitcoin/node/configuration.hpp>
 #include <bitcoin/node/define.hpp>
 
 namespace libbitcoin {
@@ -43,8 +44,15 @@ class BCN_API chaser
 public:
     enum class chase
     {
+        /// A new strong branch exists (strong height_t).
+        /// Issued by 'block' and handled by 'confirm'.
+        /// The block chaser works with the blocks-first protocol.
+        /// Bocks first performs header/checked/connected stages.
+        block,
+
         /// A new strong branch exists (strong height_t).
         /// Issued by 'header' and handled by 'check'.
+        /// The block chaser works with the header-first protocol.
         header,
 
         /// A block has been downloaded, checked and stored (header_t).
@@ -91,6 +99,9 @@ class BCN_API chaser
     chaser(full_node& node) NOEXCEPT;
     ~chaser() NOEXCEPT;
 
+    /// Node configuration settings.
+    const node::configuration& config() const NOEXCEPT;
+
     /// Thread safe synchronous archival interface.
     query& archive() const NOEXCEPT;
 
@@ -117,6 +128,7 @@ class BCN_API chaser
 
     // These are thread safe (mostly).
     full_node& node_;
+    const node::configuration& config_;
     network::asio::strand strand_;
 
     // This is protected by the network strand.

include/bitcoin/node/chasers/chaser_block.hpp

@@ -0,0 +1,113 @@
+/**
+ * Copyright (c) 2011-2023 libbitcoin developers (see AUTHORS)
+ *
+ * This file is part of libbitcoin.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef LIBBITCOIN_NODE_CHASERS_CHASER_BLOCK_HPP
+#define LIBBITCOIN_NODE_CHASERS_CHASER_BLOCK_HPP
+
+#include <unordered_map>
+#include <bitcoin/database.hpp>
+#include <bitcoin/network.hpp>
+#include <bitcoin/node/define.hpp>
+#include <bitcoin/node/chasers/chaser.hpp>
+
+namespace libbitcoin {
+namespace node {
+
+class full_node;
+
+/// Chase down stronger block branches for the confirmed chain.
+/// Weak branches are retained in a hash table if not store populated.
+/// Strong branches reorganize the candidate chain and fire the 'connect' event.
+class BCN_API chaser_block
+  : public chaser
+{
+public:
+    DELETE_COPY_MOVE(chaser_block);
+
+    chaser_block(full_node& node) NOEXCEPT;
+    virtual ~chaser_block() NOEXCEPT;
+
+    virtual code start() NOEXCEPT;
+
+    /// Validate and organize next block in sequence relative to caller peer.
+    /// Causes a fault/stop if preceding blocks have not been stored.
+    virtual void organize(
+        const system::chain::block::cptr& block_ptr) NOEXCEPT;
+
+protected:
+    struct validated_block
+    {
+        database::context context;
+        system::chain::block::cptr item;
+    };
+    typedef std::vector<database::header_link> header_links;
+
+    // This is protected by strand.
+    system::chain::chain_state::ptr state_{};
+    std::unordered_map<system::hash_digest, validated_block> tree_{};
+
+    /// Handlers.
+    virtual void handle_event(const code& ec, chase event_,
+        link value) NOEXCEPT;
+
+    /// Sum of work from header to fork point (excluded).
+    virtual bool get_branch_work(uint256_t& work, size_t& point,
+        system::hashes& tree_branch, header_links& store_branch,
+        const system::chain::header& header) const NOEXCEPT;
+
+    /// Strong if new branch work exceeds confirmed work.
+    /// Also obtains fork point for work summation termination.
+    /// Also obtains ordered branch identifiers for subsequent reorg.
+    virtual bool get_is_strong(bool& strong, const uint256_t& work,
+        size_t point) const NOEXCEPT;
+
+    /// Header timestamp is within configured span from current time.
+    virtual bool is_current(const system::chain::header& header,
+        size_t height) const NOEXCEPT;
+
+    /// Save block to tree with validation context.
+    virtual void save(const system::chain::block::cptr& block,
+        const system::chain::context& context) NOEXCEPT;
+
+    /// Store block to database and push to top of candidate chain.
+    virtual database::header_link push(
+        const system::chain::block::cptr& block,
+        const system::chain::context& context) const NOEXCEPT;
+
+    /// Move tree header to database and push to top of candidate chain.
+    virtual bool push(const system::hash_digest& key) NOEXCEPT;
+
+    /// Properties.
+    /// Given non-current blocks cached in memory, should always be zero/false.
+    virtual const network::wall_clock::duration& currency_window() const NOEXCEPT;
+    virtual bool use_currency_window() const NOEXCEPT;
+
+private:
+    void do_handle_event(const code& ec, chase event_, link value) NOEXCEPT;
+    void do_organize(const system::chain::block::cptr& block) NOEXCEPT;
+
+    // These are thread safe.
+    const system::chain::checkpoints& checkpoints_;
+    const network::wall_clock::duration currency_window_;
+    const bool use_currency_window_;
+};
+
+} // namespace node
+} // namespace libbitcoin
+
+#endif

include/bitcoin/node/chasers/chaser_candidate.hpp

@@ -34,7 +34,10 @@ class BCN_API chaser_candidate
   : public chaser
 {
 public:
+    DELETE_COPY_MOVE(chaser_candidate);
+
     chaser_candidate(full_node& node) NOEXCEPT;
+    virtual ~chaser_candidate() NOEXCEPT;
 
     virtual code start() NOEXCEPT;
 

include/bitcoin/node/chasers/chaser_check.hpp

@@ -34,7 +34,10 @@ class BCN_API chaser_check
   : public chaser
 {
 public:
+    DELETE_COPY_MOVE(chaser_check);
+
     chaser_check(full_node& node) NOEXCEPT;
+    virtual ~chaser_check() NOEXCEPT;
 
     virtual code start() NOEXCEPT;
     virtual void checked(const system::chain::block::cptr& block) NOEXCEPT;

include/bitcoin/node/chasers/chaser_confirm.hpp

@@ -34,7 +34,10 @@ class BCN_API chaser_confirm
   : public chaser
 {
 public:
+    DELETE_COPY_MOVE(chaser_confirm);
+
     chaser_confirm(full_node& node) NOEXCEPT;
+    virtual ~chaser_confirm() NOEXCEPT;
 
     virtual code start() NOEXCEPT;
 

include/bitcoin/node/chasers/chaser_connect.hpp

@@ -34,7 +34,10 @@ class BCN_API chaser_connect
   : public chaser
 {
 public:
+    DELETE_COPY_MOVE(chaser_connect);
+
     chaser_connect(full_node& node) NOEXCEPT;
+    virtual ~chaser_connect() NOEXCEPT;
 
     virtual code start() NOEXCEPT;
 

include/bitcoin/node/chasers/chaser_header.hpp

@@ -22,6 +22,7 @@
 #include <unordered_map>
 #include <bitcoin/database.hpp>
 #include <bitcoin/network.hpp>
+#include <bitcoin/node/configuration.hpp>
 #include <bitcoin/node/define.hpp>
 #include <bitcoin/node/chasers/chaser.hpp>
 
@@ -37,25 +38,28 @@ class BCN_API chaser_header
   : public chaser
 {
 public:
+    DELETE_COPY_MOVE(chaser_header);
+
     chaser_header(full_node& node) NOEXCEPT;
+    virtual ~chaser_header() NOEXCEPT;
 
     virtual code start() NOEXCEPT;
 
-    /// Organize the next header in sequence, relative to caller's peer.
+    /// Validate and organize next header in sequence relative to caller peer.
     /// Causes a fault/stop if preceding headers have not been stored.
-    /// Caller must validate the header and provide context.
-    virtual void organize(const system::chain::header::cptr& header,
-        system::chain::context&& context) NOEXCEPT;
+    virtual void organize(
+        const system::chain::header::cptr& header_ptr) NOEXCEPT;
 
 protected:
     struct proposed_header
     {
         database::context context;
-        system::chain::header::cptr header;
+        system::chain::header::cptr item;
     };
     typedef std::vector<database::header_link> header_links;
 
-    // This is protected by strand.
+    // These are protected by strand.
+    system::chain::chain_state::ptr state_{};
     std::unordered_map<system::hash_digest, proposed_header> tree_{};
 
     /// Handlers.
@@ -74,7 +78,8 @@ class BCN_API chaser_header
         size_t point) const NOEXCEPT;
 
     /// Header timestamp is within configured span from current time.
-    virtual bool is_current(const system::chain::header& header) const NOEXCEPT;
+    virtual bool is_current(const system::chain::header& header,
+        size_t height) const NOEXCEPT;
 
     /// Save header to tree with validation context.
     virtual void save(const system::chain::header::cptr& header,
@@ -94,10 +99,10 @@ class BCN_API chaser_header
 
 private:
     void do_handle_event(const code& ec, chase event_, link value) NOEXCEPT;
-    void do_organize(const system::chain::header::cptr& header,
-        const system::chain::context& context) NOEXCEPT;
+    void do_organize(const system::chain::header::cptr& header) NOEXCEPT;
 
     // These are thread safe.
+    const system::chain::checkpoints& checkpoints_;
     const network::wall_clock::duration currency_window_;
     const bool use_currency_window_;
 };

include/bitcoin/node/chasers/chaser_transaction.hpp

@@ -34,7 +34,10 @@ class BCN_API chaser_transaction
   : public chaser
 {
 public:
+    DELETE_COPY_MOVE(chaser_transaction);
+
     chaser_transaction(full_node& node) NOEXCEPT;
+    virtual ~chaser_transaction() NOEXCEPT;
 
     code start() NOEXCEPT override;
     virtual void store(const system::chain::transaction::cptr& block) NOEXCEPT;

include/bitcoin/node/chasers/chasers.hpp

@@ -20,6 +20,7 @@
 #define LIBBITCOIN_NODE_CHASERS_CHASERS_HPP
 
 #include <bitcoin/node/chasers/chaser.hpp>
+#include <bitcoin/node/chasers/chaser_block.hpp>
 #include <bitcoin/node/chasers/chaser_candidate.hpp>
 #include <bitcoin/node/chasers/chaser_check.hpp>
 #include <bitcoin/node/chasers/chaser_confirm.hpp>

include/bitcoin/node/error.hpp

@@ -49,6 +49,7 @@ enum error_t : uint8_t
     stalled_channel,
 
     // blockchain
+    orphan_block,
     orphan_header,
     insufficient_work,
     duplicate_block