Add calcpow RPC

Calculate PoW hash for a block candidate

src/cryptonote_core/cryptonote_tx_utils.cpp

@@ -678,7 +678,7 @@ namespace cryptonote
     rx_slow_hash(main_height, seed_height, seed_hash.data, bd.data(), bd.size(), res.data, 0, 1);
   }
 
-  bool get_block_longhash(const Blockchain *pbc, const block& b, crypto::hash& res, const uint64_t height, const crypto::hash *seed_hash, const int miners)
+  bool get_block_longhash(const Blockchain *pbc, const blobdata& bd, crypto::hash& res, const uint64_t height, const int major_version, const crypto::hash *seed_hash, const int miners)
   {
     // block 202612 bug workaround
     if (height == 202612)
@@ -687,8 +687,7 @@ namespace cryptonote
       epee::string_tools::hex_to_pod(longhash_202612, res);
       return true;
     }
-    blobdata bd = get_block_hashing_blob(b);
+    if (major_version >= RX_BLOCK_VERSION)
-    if (b.major_version >= RX_BLOCK_VERSION)
     {
       uint64_t seed_height, main_height;
       crypto::hash hash;
@@ -705,12 +704,18 @@ namespace cryptonote
       }
       rx_slow_hash(main_height, seed_height, hash.data, bd.data(), bd.size(), res.data, seed_hash ? 0 : miners, !!seed_hash);
     } else {
-      const int pow_variant = b.major_version >= 7 ? b.major_version - 6 : 0;
+      const int pow_variant = major_version >= 7 ? major_version - 6 : 0;
       crypto::cn_slow_hash(bd.data(), bd.size(), res, pow_variant, height);
     }
     return true;
   }
 
+  bool get_block_longhash(const Blockchain *pbc, const block& b, crypto::hash& res, const uint64_t height, const crypto::hash *seed_hash, const int miners)
+  {
+    blobdata bd = get_block_hashing_blob(b);
+	return get_block_longhash(pbc, bd, res, height, b.major_version, seed_hash, miners);
+  }
+
   bool get_block_longhash(const Blockchain *pbc, const block& b, crypto::hash& res, const uint64_t height, const int miners)
   {
     return get_block_longhash(pbc, b, res, height, NULL, miners);

src/cryptonote_core/cryptonote_tx_utils.h

@@ -142,6 +142,8 @@ namespace cryptonote
     );
 
   class Blockchain;
+  bool get_block_longhash(const Blockchain *pb, const blobdata& bd, crypto::hash& res, const uint64_t height,
+    const int major_version, const crypto::hash *seed_hash, const int miners);
   bool get_block_longhash(const Blockchain *pb, const block& b, crypto::hash& res, const uint64_t height, const int miners);
   bool get_block_longhash(const Blockchain *pb, const block& b, crypto::hash& res, const uint64_t height, const crypto::hash *seed_hash, const int miners);
   void get_altblock_longhash(const block& b, crypto::hash& res, const uint64_t main_height, const uint64_t height,

src/rpc/core_rpc_server.cpp

@@ -1912,6 +1912,43 @@ namespace cryptonote
     return true;
   }
   //------------------------------------------------------------------------------------------------------------------------------
+  bool core_rpc_server::on_calcpow(const COMMAND_RPC_CALCPOW::request& req, COMMAND_RPC_CALCPOW::response& res, epee::json_rpc::error& error_resp, const connection_context *ctx)
+  {
+    RPC_TRACKER(calcpow);
+
+    blobdata blockblob;
+    if(!string_tools::parse_hexstr_to_binbuff(req.block_blob, blockblob))
+    {
+      error_resp.code = CORE_RPC_ERROR_CODE_WRONG_BLOCKBLOB;
+      error_resp.message = "Wrong block blob";
+      return false;
+    }
+    if(!m_core.check_incoming_block_size(blockblob))
+    {
+      error_resp.code = CORE_RPC_ERROR_CODE_WRONG_BLOCKBLOB_SIZE;
+      error_resp.message = "Block blob size is too big, rejecting block";
+      return false;
+    }
+    crypto::hash seed_hash, pow_hash;
+    std::string buf;
+    if(req.seed_hash.size())
+    {
+      if (!string_tools::parse_hexstr_to_binbuff(req.seed_hash, buf) ||
+        buf.size() != sizeof(crypto::hash))
+      {
+        error_resp.code = CORE_RPC_ERROR_CODE_WRONG_PARAM;
+        error_resp.message = "Wrong seed hash";
+        return false;
+      }
+      buf.copy(reinterpret_cast<char *>(&seed_hash), sizeof(crypto::hash));
+    }
+
+    cryptonote::get_block_longhash(&(m_core.get_blockchain_storage()), blockblob, pow_hash, req.height,
+      req.major_version, req.seed_hash.size() ? &seed_hash : NULL, 0);
+    res = string_tools::pod_to_hex(pow_hash);
+    return true;
+  }
+  //------------------------------------------------------------------------------------------------------------------------------
   bool core_rpc_server::on_add_aux_pow(const COMMAND_RPC_ADD_AUX_POW::request& req, COMMAND_RPC_ADD_AUX_POW::response& res, epee::json_rpc::error& error_resp, const connection_context *ctx)
   {
     RPC_TRACKER(add_aux_pow);

src/rpc/core_rpc_server.h

@@ -149,6 +149,7 @@ namespace cryptonote
         MAP_JON_RPC_WE("get_block_template",     on_getblocktemplate,           COMMAND_RPC_GETBLOCKTEMPLATE)
         MAP_JON_RPC_WE("getblocktemplate",       on_getblocktemplate,           COMMAND_RPC_GETBLOCKTEMPLATE)
         MAP_JON_RPC_WE("get_miner_data",         on_getminerdata,               COMMAND_RPC_GETMINERDATA)
+        MAP_JON_RPC_WE_IF("calc_pow",            on_calcpow,                    COMMAND_RPC_CALCPOW, !m_restricted)
         MAP_JON_RPC_WE("add_aux_pow",            on_add_aux_pow,                COMMAND_RPC_ADD_AUX_POW)
         MAP_JON_RPC_WE("submit_block",           on_submitblock,                COMMAND_RPC_SUBMITBLOCK)
         MAP_JON_RPC_WE("submitblock",            on_submitblock,                COMMAND_RPC_SUBMITBLOCK)
@@ -231,6 +232,7 @@ namespace cryptonote
     bool on_getblockhash(const COMMAND_RPC_GETBLOCKHASH::request& req, COMMAND_RPC_GETBLOCKHASH::response& res, epee::json_rpc::error& error_resp, const connection_context *ctx = NULL);
     bool on_getblocktemplate(const COMMAND_RPC_GETBLOCKTEMPLATE::request& req, COMMAND_RPC_GETBLOCKTEMPLATE::response& res, epee::json_rpc::error& error_resp, const connection_context *ctx = NULL);
     bool on_getminerdata(const COMMAND_RPC_GETMINERDATA::request& req, COMMAND_RPC_GETMINERDATA::response& res, epee::json_rpc::error& error_resp, const connection_context *ctx = NULL);
+    bool on_calcpow(const COMMAND_RPC_CALCPOW::request& req, COMMAND_RPC_CALCPOW::response& res, epee::json_rpc::error& error_resp, const connection_context *ctx = NULL);
     bool on_add_aux_pow(const COMMAND_RPC_ADD_AUX_POW::request& req, COMMAND_RPC_ADD_AUX_POW::response& res, epee::json_rpc::error& error_resp, const connection_context *ctx = NULL);
     bool on_submitblock(const COMMAND_RPC_SUBMITBLOCK::request& req, COMMAND_RPC_SUBMITBLOCK::response& res, epee::json_rpc::error& error_resp, const connection_context *ctx = NULL);
     bool on_generateblocks(const COMMAND_RPC_GENERATEBLOCKS::request& req, COMMAND_RPC_GENERATEBLOCKS::response& res, epee::json_rpc::error& error_resp, const connection_context *ctx = NULL);

src/rpc/core_rpc_server_commands_defs.h

@@ -88,7 +88,7 @@ namespace cryptonote
 // advance which version they will stop working with
 // Don't go over 32767 for any of these
 #define CORE_RPC_VERSION_MAJOR 3
-#define CORE_RPC_VERSION_MINOR 8
+#define CORE_RPC_VERSION_MINOR 9
 #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)
 
@@ -990,6 +990,28 @@ namespace cryptonote
     typedef epee::misc_utils::struct_init<response_t> response;
   };
 
+  struct COMMAND_RPC_CALCPOW
+  {
+    struct request_t: public rpc_request_base
+    {
+      uint8_t major_version;
+      uint64_t height;
+      blobdata block_blob;
+      std::string seed_hash;
+
+      BEGIN_KV_SERIALIZE_MAP()
+        KV_SERIALIZE_PARENT(rpc_request_base)
+        KV_SERIALIZE(major_version)
+        KV_SERIALIZE(height)
+        KV_SERIALIZE(block_blob)
+        KV_SERIALIZE(seed_hash)
+      END_KV_SERIALIZE_MAP()
+    };
+    typedef epee::misc_utils::struct_init<request_t> request;
+
+    typedef std::string response;
+  };
+
   struct COMMAND_RPC_ADD_AUX_POW
   {
     struct aux_pow_t