rpc: add a command to get info about the current blockchain

About the tip of the main chain, and the last N blocks

src/daemon/command_parser_executor.cpp

@@ -511,4 +511,22 @@ bool t_command_parser_executor::alt_chain_info(const std::vector<std::string>& a
   return m_executor.alt_chain_info();
 }
 
+bool t_command_parser_executor::print_blockchain_dynamic_stats(const std::vector<std::string>& args)
+{
+  if(args.size() != 1)
+  {
+    std::cout << "Exactly one parameter is needed" << std::endl;
+    return false;
+  }
+
+  uint64_t nblocks = 0;
+  if(!epee::string_tools::get_xtype_from_string(nblocks, args[0]) || nblocks == 0)
+  {
+    std::cout << "wrong number of blocks" << std::endl;
+    return false;
+  }
+
+  return m_executor.print_blockchain_dynamic_stats(nblocks);
+}
+
 } // namespace daemonize

src/daemon/command_parser_executor.h

@@ -121,6 +121,8 @@ public:
   bool print_coinbase_tx_sum(const std::vector<std::string>& args);
 
   bool alt_chain_info(const std::vector<std::string>& args);
+
+  bool print_blockchain_dynamic_stats(const std::vector<std::string>& args);
 };
 
 } // namespace daemonize

src/daemon/command_server.cpp

@@ -230,6 +230,11 @@ t_command_server::t_command_server(
     , std::bind(&t_command_parser_executor::alt_chain_info, &m_parser, p::_1)
     , "Print information about alternative chains"
     );
+    m_command_lookup.set_handler(
+      "bc_dyn_stats"
+    , std::bind(&t_command_parser_executor::print_blockchain_dynamic_stats, &m_parser, p::_1)
+    , "Print information about current blockchain dynamic state"
+    );
 }
 
 bool t_command_server::process_command_str(const std::string& cmd)

src/daemon/rpc_command_executor.cpp

@@ -1406,5 +1406,108 @@ bool t_rpc_command_executor::alt_chain_info()
   return true;
 }
 
+bool t_rpc_command_executor::print_blockchain_dynamic_stats(uint64_t nblocks)
+{
+  cryptonote::COMMAND_RPC_GET_INFO::request ireq;
+  cryptonote::COMMAND_RPC_GET_INFO::response ires;
+  cryptonote::COMMAND_RPC_GET_BLOCK_HEADERS_RANGE::request bhreq;
+  cryptonote::COMMAND_RPC_GET_BLOCK_HEADERS_RANGE::response bhres;
+  cryptonote::COMMAND_RPC_GET_PER_KB_FEE_ESTIMATE::request fereq;
+  cryptonote::COMMAND_RPC_GET_PER_KB_FEE_ESTIMATE::response feres;
+  epee::json_rpc::error error_resp;
+
+  std::string fail_message = "Problem fetching info";
+
+  if (m_is_rpc)
+  {
+    if (!m_rpc_client->rpc_request(ireq, ires, "/getinfo", fail_message.c_str()))
+    {
+      return true;
+    }
+    if (!m_rpc_client->rpc_request(fereq, feres, "/get_fee_estimate", fail_message.c_str()))
+    {
+      return true;
+    }
+  }
+  else
+  {
+    if (!m_rpc_server->on_get_info(ireq, ires) || ires.status != CORE_RPC_STATUS_OK)
+    {
+      tools::fail_msg_writer() << fail_message.c_str();
+      return true;
+    }
+    if (!m_rpc_server->on_get_per_kb_fee_estimate(fereq, feres, error_resp) || feres.status != CORE_RPC_STATUS_OK)
+    {
+      tools::fail_msg_writer() << fail_message.c_str();
+      return true;
+    }
+  }
+
+  tools::msg_writer() << "Height: " << ires.height << ", diff " << ires.difficulty << ", cum. diff " << ires.cumulative_difficulty
+      << ", target " << ires.target << " sec" << ", dyn fee " << cryptonote::print_money(feres.fee) << "/kB";
+
+  if (nblocks > 0)
+  {
+    if (nblocks > ires.height)
+      nblocks = ires.height;
+
+    bhreq.start_height = ires.height - nblocks;
+    bhreq.end_height = ires.height - 1;
+    if (m_is_rpc)
+    {
+      if (!m_rpc_client->rpc_request(bhreq, bhres, "/getblockheadersrange", fail_message.c_str()))
+      {
+        return true;
+      }
+    }
+    else
+    {
+      if (!m_rpc_server->on_get_block_headers_range(bhreq, bhres, error_resp) || bhres.status != CORE_RPC_STATUS_OK)
+      {
+        tools::fail_msg_writer() << fail_message.c_str();
+        return true;
+      }
+    }
+
+    double avgdiff = 0;
+    double avgnumtxes = 0;
+    double avgreward = 0;
+    std::vector<uint64_t> sizes;
+    sizes.reserve(nblocks);
+    std::vector<unsigned> major_versions(256, 0), minor_versions(256, 0);
+    for (const auto &bhr: bhres.headers)
+    {
+      avgdiff += bhr.difficulty;
+      avgnumtxes += bhr.num_txes;
+      avgreward += bhr.reward;
+      sizes.push_back(bhr.block_size);
+      static_assert(sizeof(bhr.major_version) == 1, "major_version expected to be uint8_t");
+      static_assert(sizeof(bhr.minor_version) == 1, "major_version expected to be uint8_t");
+      major_versions[(unsigned)bhr.major_version]++;
+      minor_versions[(unsigned)bhr.minor_version]++;
+    }
+    avgdiff /= nblocks;
+    avgnumtxes /= nblocks;
+    avgreward /= nblocks;
+    uint64_t median_block_size = epee::misc_utils::median(sizes);
+    tools::msg_writer() << "Last " << nblocks << ": avg. diff " << (uint64_t)avgdiff << ", avg num txes " << avgnumtxes
+        << ", avg. reward " << cryptonote::print_money(avgreward) << ", median block size " << median_block_size;
+
+    unsigned int max_major = 256, max_minor = 256;
+    while (max_major > 0 && !major_versions[--max_major]);
+    while (max_minor > 0 && !minor_versions[--max_minor]);
+    std::string s = "";
+    for (unsigned n = 0; n <= max_major; ++n)
+      if (major_versions[n])
+        s += (s.empty() ? "" : ", ") + boost::lexical_cast<std::string>(major_versions[n]) + std::string(" v") + boost::lexical_cast<std::string>(n);
+    tools::msg_writer() << "Block versions: " << s;
+    s = "";
+    for (unsigned n = 0; n <= max_minor; ++n)
+      if (minor_versions[n])
+        s += (s.empty() ? "" : ", ") + boost::lexical_cast<std::string>(minor_versions[n]) + std::string(" v") + boost::lexical_cast<std::string>(n);
+    tools::msg_writer() << "Voting for: " << s;
+  }
+  return true;
+}
 
 }// namespace daemonize

src/daemon/rpc_command_executor.h

@@ -139,6 +139,8 @@ public:
   bool print_coinbase_tx_sum(uint64_t height, uint64_t count);
 
   bool alt_chain_info();
+
+  bool print_blockchain_dynamic_stats(uint64_t nblocks);
 };
 
 } // namespace daemonize

src/rpc/core_rpc_server.cpp

@@ -896,6 +896,7 @@ namespace cryptonote
     response.difficulty = m_core.get_blockchain_storage().block_difficulty(height);
     response.reward = get_block_reward(blk);
     response.block_size = m_core.get_blockchain_storage().get_db().get_block_size(height);
+    response.num_txes = blk.tx_hashes.size();
     return true;
   }
   //------------------------------------------------------------------------------------------------------------------------------

src/rpc/core_rpc_server_commands_defs.h

@@ -49,7 +49,7 @@ namespace cryptonote
 // advance which version they will stop working with
 // Don't go over 32767 for any of these
 #define CORE_RPC_VERSION_MAJOR 1
-#define CORE_RPC_VERSION_MINOR 4
+#define CORE_RPC_VERSION_MINOR 5
 #define CORE_RPC_VERSION (((CORE_RPC_VERSION_MAJOR)<<16)|(CORE_RPC_VERSION_MINOR))
 
   struct COMMAND_RPC_GET_HEIGHT
@@ -706,6 +706,7 @@ namespace cryptonote
       difficulty_type difficulty;
       uint64_t reward;
       uint64_t block_size;
+      uint64_t num_txes;
       
       BEGIN_KV_SERIALIZE_MAP()
         KV_SERIALIZE(major_version)
@@ -720,6 +721,7 @@ namespace cryptonote
         KV_SERIALIZE(difficulty)
         KV_SERIALIZE(reward)
         KV_SERIALIZE(block_size)
+        KV_SERIALIZE(num_txes)
       END_KV_SERIALIZE_MAP()
   };