core: warn when free disk space is low

src/rpc/core_rpc_server.cpp

@@ -157,6 +157,7 @@ namespace cryptonote
     res.block_size_limit = m_core.get_blockchain_storage().get_current_cumulative_blocksize_limit();
     res.status = CORE_RPC_STATUS_OK;
     res.start_time = (uint64_t)m_core.get_start_time();
+    res.free_space = m_restricted ? std::numeric_limits<uint64_t>::max() : m_core.get_free_space();
     return true;
   }
   //------------------------------------------------------------------------------------------------------------------------------
@@ -1335,6 +1336,7 @@ namespace cryptonote
     res.block_size_limit = m_core.get_blockchain_storage().get_current_cumulative_blocksize_limit();
     res.status = CORE_RPC_STATUS_OK;
     res.start_time = (uint64_t)m_core.get_start_time();
+    res.free_space = m_restricted ? std::numeric_limits<uint64_t>::max() : m_core.get_free_space();
     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 15
+#define CORE_RPC_VERSION_MINOR 16
 #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)
 
@@ -924,6 +924,7 @@ namespace cryptonote
       uint64_t cumulative_difficulty;
       uint64_t block_size_limit;
       uint64_t start_time;
+      uint64_t free_space;
 
       BEGIN_KV_SERIALIZE_MAP()
         KV_SERIALIZE(status)
@@ -943,6 +944,7 @@ namespace cryptonote
         KV_SERIALIZE(cumulative_difficulty)
         KV_SERIALIZE(block_size_limit)
         KV_SERIALIZE(start_time)
+        KV_SERIALIZE(free_space)
       END_KV_SERIALIZE_MAP()
     };
   };