Daemon RPC: /getblocks.bin optional block_ids_exclusive req param

src/cryptonote_core/blockchain.cpp

@@ -2736,17 +2736,18 @@ bool Blockchain::find_blockchain_supplement(const std::list<crypto::hash>& qbloc
 // find split point between ours and foreign blockchain (or start at
 // blockchain height <req_start_block>), and return up to max_count FULL
 // blocks by reference.
-bool Blockchain::find_blockchain_supplement(const uint64_t req_start_block, const std::list<crypto::hash>& qblock_ids, std::vector<std::pair<std::pair<cryptonote::blobdata, crypto::hash>, std::vector<std::pair<crypto::hash, cryptonote::blobdata> > > >& blocks, uint64_t& total_height, crypto::hash& top_hash, uint64_t& start_height, bool pruned, bool get_miner_tx_hash, size_t max_block_count, size_t max_tx_count) const
+bool Blockchain::find_blockchain_supplement(const uint64_t req_start_block, const std::list<crypto::hash>& qblock_ids, std::vector<std::pair<std::pair<cryptonote::blobdata, crypto::hash>, std::vector<std::pair<crypto::hash, cryptonote::blobdata> > > >& blocks, uint64_t& total_height, crypto::hash& top_hash, uint64_t& start_height, bool pruned, bool get_miner_tx_hash, const bool qblock_ids_exclusive, size_t max_block_count, size_t max_tx_count) const
 {
   LOG_PRINT_L3("Blockchain::" << __func__);
   CRITICAL_REGION_LOCAL(m_blockchain_lock);
 
+  top_hash = m_db->top_block_hash(&total_height);
+  ++total_height;
+
   // if a specific start height has been requested
   if(req_start_block > 0)
   {
     // if requested height is higher than our chain, return false -- we can't help
-    top_hash = m_db->top_block_hash(&total_height);
-    ++total_height;
     if (req_start_block >= total_height)
     {
       return false;
@@ -2755,15 +2756,30 @@ bool Blockchain::find_blockchain_supplement(const uint64_t req_start_block, cons
   }
   else
   {
+    // find_blockchain_supplement's start_height is the highest block idx included in qblock_ids that's *also* in the main chain
     if(!find_blockchain_supplement(qblock_ids, start_height))
     {
       return false;
     }
+    if (qblock_ids_exclusive)
+    {
+      // start from 1 block higher than the first common block (i.e. from the first block the client might not know about)
+      ++start_height;
+
+      // if start_height is now the chain tip, we can return a truthy empty resp
+      if (start_height == total_height)
+      {
+        LOG_PRINT_L3("Returning empty find_blockchain_supplement, start_height: " << start_height);
+        blocks.clear();
+        return true;
+      }
+    }
   }
 
   db_rtxn_guard rtxn_guard(m_db);
   top_hash = m_db->top_block_hash(&total_height);
   ++total_height;
+  CHECK_AND_ASSERT_MES(total_height > start_height, false, "chain height expected to be higher than start block");
   blocks.reserve(std::min(std::min(max_block_count, (size_t)10000), (size_t)(total_height - start_height)));
   CHECK_AND_ASSERT_MES(m_db->get_blocks_from(start_height, 3, max_block_count, max_tx_count, FIND_BLOCKCHAIN_SUPPLEMENT_MAX_SIZE, blocks, pruned, true, get_miner_tx_hash),
       false, "Error getting blocks");

src/cryptonote_core/blockchain.h

@@ -504,12 +504,13 @@ namespace cryptonote
      * @param top_hash return-by-reference top block hash
      * @param start_height return-by-reference the height of the first block returned
      * @param pruned whether to return full or pruned tx blobs
+     * @param qblock_ids_exclusive when using qblock_ids, whether or not to include highest common block in response
      * @param max_block_count the max number of blocks to get
      * @param max_tx_count the max number of txes to get (it can get overshot by the last block's number of txes minus 1)
      *
      * @return true if a block found in common or req_start_block specified, else false
      */
-    bool find_blockchain_supplement(const uint64_t req_start_block, const std::list<crypto::hash>& qblock_ids, std::vector<std::pair<std::pair<cryptonote::blobdata, crypto::hash>, std::vector<std::pair<crypto::hash, cryptonote::blobdata> > > >& blocks, uint64_t& total_height, crypto::hash& top_hash, uint64_t& start_height, bool pruned, bool get_miner_tx_hash, size_t max_block_count, size_t max_tx_count) const;
+    bool find_blockchain_supplement(const uint64_t req_start_block, const std::list<crypto::hash>& qblock_ids, std::vector<std::pair<std::pair<cryptonote::blobdata, crypto::hash>, std::vector<std::pair<crypto::hash, cryptonote::blobdata> > > >& blocks, uint64_t& total_height, crypto::hash& top_hash, uint64_t& start_height, bool pruned, bool get_miner_tx_hash, const bool qblock_ids_exclusive, size_t max_block_count, size_t max_tx_count) const;
 
     /**
      * @brief retrieves a set of blocks and their transactions, and possibly other transactions

src/cryptonote_core/cryptonote_core.cpp

@@ -1225,9 +1225,9 @@ namespace cryptonote
     return m_blockchain_storage.find_blockchain_supplement(qblock_ids, clip_pruned, resp);
   }
   //-----------------------------------------------------------------------------------------------
-  bool core::find_blockchain_supplement(const uint64_t req_start_block, const std::list<crypto::hash>& qblock_ids, std::vector<std::pair<std::pair<cryptonote::blobdata, crypto::hash>, std::vector<std::pair<crypto::hash, cryptonote::blobdata> > > >& blocks, uint64_t& total_height, crypto::hash& top_hash, uint64_t& start_height, bool pruned, bool get_miner_tx_hash, size_t max_block_count, size_t max_tx_count) const
+  bool core::find_blockchain_supplement(const uint64_t req_start_block, const std::list<crypto::hash>& qblock_ids, std::vector<std::pair<std::pair<cryptonote::blobdata, crypto::hash>, std::vector<std::pair<crypto::hash, cryptonote::blobdata> > > >& blocks, uint64_t& total_height, crypto::hash& top_hash, uint64_t& start_height, bool pruned, bool get_miner_tx_hash, const bool qblock_ids_exclusive, size_t max_block_count, size_t max_tx_count) const
   {
-    return m_blockchain_storage.find_blockchain_supplement(req_start_block, qblock_ids, blocks, total_height, top_hash, start_height, pruned, get_miner_tx_hash, max_block_count, max_tx_count);
+    return m_blockchain_storage.find_blockchain_supplement(req_start_block, qblock_ids, blocks, total_height, top_hash, start_height, pruned, get_miner_tx_hash, qblock_ids_exclusive, max_block_count, max_tx_count);
   }
   //-----------------------------------------------------------------------------------------------
   bool core::get_outs(const COMMAND_RPC_GET_OUTPUTS_BIN::request& req, COMMAND_RPC_GET_OUTPUTS_BIN::response& res) const

src/cryptonote_core/cryptonote_core.h

@@ -593,7 +593,7 @@ namespace cryptonote
       *
       * @note see Blockchain::find_blockchain_supplement(const uint64_t, const std::list<crypto::hash>&, std::vector<std::pair<cryptonote::blobdata, std::vector<transaction> > >&, uint64_t&, uint64_t&, size_t) const
       */
-     bool find_blockchain_supplement(const uint64_t req_start_block, const std::list<crypto::hash>& qblock_ids, std::vector<std::pair<std::pair<cryptonote::blobdata, crypto::hash>, std::vector<std::pair<crypto::hash, cryptonote::blobdata> > > >& blocks, uint64_t& total_height, crypto::hash& top_hash, uint64_t& start_height, bool pruned, bool get_miner_tx_hash, size_t max_block_count, size_t max_tx_count) const;
+     bool find_blockchain_supplement(const uint64_t req_start_block, const std::list<crypto::hash>& qblock_ids, std::vector<std::pair<std::pair<cryptonote::blobdata, crypto::hash>, std::vector<std::pair<crypto::hash, cryptonote::blobdata> > > >& blocks, uint64_t& total_height, crypto::hash& top_hash, uint64_t& start_height, bool pruned, bool get_miner_tx_hash, const bool qblock_ids_exclusive, size_t max_block_count, size_t max_tx_count) const;
 
      /**
       * @copydoc Blockchain::get_tx_outputs_gindexs

src/rpc/core_rpc_server.cpp

@@ -755,7 +755,7 @@ namespace cryptonote
       }
 
       std::vector<std::pair<std::pair<cryptonote::blobdata, crypto::hash>, std::vector<std::pair<crypto::hash, cryptonote::blobdata> > > > bs;
-      if(!m_core.find_blockchain_supplement(req.start_height, req.block_ids, bs, res.current_height, res.top_block_hash, res.start_height, req.prune, !req.no_miner_tx, max_blocks, COMMAND_RPC_GET_BLOCKS_FAST_MAX_TX_COUNT))
+      if(!m_core.find_blockchain_supplement(req.start_height, req.block_ids, bs, res.current_height, res.top_block_hash, res.start_height, req.prune, !req.no_miner_tx, req.block_ids_exclusive, max_blocks, COMMAND_RPC_GET_BLOCKS_FAST_MAX_TX_COUNT))
       {
         res.status = "Failed";
         add_host_fail(ctx);

src/rpc/core_rpc_server_commands_defs.h

@@ -101,7 +101,7 @@ inline const std::string get_rpc_status(const bool trusted_daemon, const std::st
 // advance which version they will stop working with
 // Don't go over 32767 for any of these
 #define CORE_RPC_VERSION_MAJOR 3
-#define CORE_RPC_VERSION_MINOR 16
+#define CORE_RPC_VERSION_MINOR 17
 #define MAKE_CORE_RPC_VERSION(major,minor) (((major)<<16)|(minor))
 #define CORE_RPC_VERSION MAKE_CORE_RPC_VERSION(CORE_RPC_VERSION_MAJOR, CORE_RPC_VERSION_MINOR)
 
@@ -189,6 +189,7 @@ inline const std::string get_rpc_status(const bool trusted_daemon, const std::st
       uint64_t    start_height;
       bool        prune;
       bool        no_miner_tx;
+      bool        block_ids_exclusive;
       uint64_t    pool_info_since;
       uint64_t    max_block_count;
 
@@ -199,6 +200,7 @@ inline const std::string get_rpc_status(const bool trusted_daemon, const std::st
         KV_SERIALIZE(start_height)
         KV_SERIALIZE(prune)
         KV_SERIALIZE_OPT(no_miner_tx, false)
+        KV_SERIALIZE_OPT(block_ids_exclusive, false)
         KV_SERIALIZE_OPT(pool_info_since, (uint64_t)0)
         KV_SERIALIZE_OPT(max_block_count, (uint64_t)0)
       END_KV_SERIALIZE_MAP()

src/rpc/daemon_handler.cpp

@@ -128,7 +128,7 @@ namespace rpc
   {
     std::vector<std::pair<std::pair<blobdata, crypto::hash>, std::vector<std::pair<crypto::hash, blobdata> > > > blocks;
 
-    if(!m_core.find_blockchain_supplement(req.start_height, req.block_ids, blocks, res.current_height, res.top_block_hash, res.start_height, req.prune, true, COMMAND_RPC_GET_BLOCKS_FAST_MAX_BLOCK_COUNT, COMMAND_RPC_GET_BLOCKS_FAST_MAX_TX_COUNT))
+    if(!m_core.find_blockchain_supplement(req.start_height, req.block_ids, blocks, res.current_height, res.top_block_hash, res.start_height, req.prune, true, false, COMMAND_RPC_GET_BLOCKS_FAST_MAX_BLOCK_COUNT, COMMAND_RPC_GET_BLOCKS_FAST_MAX_TX_COUNT))
     {
       res.status = Message::STATUS_FAILED;
       res.error_details = "core::find_blockchain_supplement() returned false";