Merge pull request #4769

5808530f blockchain: remove unused output_scan_worker parameter (moneromooo-monero)
1426209a blockchain: don't run threads if we have just one function to run (moneromooo-monero)
6f7a5fd4 db_lmdb: slight speedup getting array data from the blockchain (moneromooo-monero)
99fbe100 db_lmdb: save some string copies for readonly db keys/values (moneromooo-monero)
bf31447e tx_pool: speed up take_tx for transactions from blocks (moneromooo-monero)
4f005a77 tx_pool: remove unnecessary get_transaction_hash (moneromooo-monero)
593ef598 perf_timer: call reserve on new timer array (moneromooo-monero)
6ecc99ad core: avoid unnecessary tx/blob conversions (moneromooo-monero)
00cc1a16 unit_tests: notify test special case for the usual weirdo (moneromooo-monero)

10 files changed, 67 insertions, 51 deletions

diff --git a/src/blockchain_db/blockchain_db.h b/src/blockchain_db/blockchain_db.h
index 71c46d76b..7118b0881 100644
--- a/src/blockchain_db/blockchain_db.h
+++ b/src/blockchain_db/blockchain_db.h
@@ -1349,7 +1349,7 @@ public:
    *
    * @param details the details of the transaction to add
    */
-  virtual void add_txpool_tx(const transaction &tx, const txpool_tx_meta_t& details) = 0;
+  virtual void add_txpool_tx(const crypto::hash &txid, const cryptonote::blobdata &blob, const txpool_tx_meta_t& details) = 0;
 
   /**
    * @brief update a txpool transaction's metadata
diff --git a/src/blockchain_db/lmdb/db_lmdb.cpp b/src/blockchain_db/lmdb/db_lmdb.cpp
index 1674c40dd..ea3638a85 100644
--- a/src/blockchain_db/lmdb/db_lmdb.cpp
+++ b/src/blockchain_db/lmdb/db_lmdb.cpp
@@ -85,6 +85,10 @@ inline void throw1(const T &e)
 
 #define MDB_val_set(var, val)   MDB_val var = {sizeof(val), (void *)&val}
 
+#define MDB_val_sized(var, val) MDB_val var = {val.size(), (void *)val.data()}
+
+#define MDB_val_str(var, val) MDB_val var = {strlen(val) + 1, (void *)val}
+
 template<typename T>
 struct MDB_val_copy: public MDB_val
 {
@@ -714,7 +718,8 @@ void BlockchainLMDB::add_block(const block& blk, size_t block_weight, const diff
   CURSOR(block_info)
 
   // this call to mdb_cursor_put will change height()
-  MDB_val_copy<blobdata> blob(block_to_blob(blk));
+  cryptonote::blobdata block_blob(block_to_blob(blk));
+  MDB_val_sized(blob, block_blob);
   result = mdb_cursor_put(m_cur_blocks, &key, &blob, MDB_APPEND);
   if (result)
     throw0(DB_ERROR(lmdb_error("Failed to add block blob to db transaction: ", result).c_str()));
@@ -828,7 +833,7 @@ uint64_t BlockchainLMDB::add_transaction_data(const crypto::hash& blk_hash, cons
     throw0(DB_ERROR(lmdb_error("Failed to add tx data to db transaction: ", result).c_str()));
 
   cryptonote::blobdata blob = tx_to_blob(tx);
-  MDB_val_copy<blobdata> blobval(blob);
+  MDB_val_sized(blobval, blob);
 
   std::stringstream ss;
   binary_archive<true> ba(ss);
@@ -836,7 +841,7 @@ uint64_t BlockchainLMDB::add_transaction_data(const crypto::hash& blk_hash, cons
   if (!r)
     throw0(DB_ERROR("Failed to serialize pruned tx"));
   std::string pruned = ss.str();
-  MDB_val_copy<blobdata> pruned_blob(pruned);
+  MDB_val_sized(pruned_blob, pruned);
   result = mdb_cursor_put(m_cur_txs_pruned, &val_tx_id, &pruned_blob, MDB_APPEND);
   if (result)
     throw0(DB_ERROR(lmdb_error("Failed to add pruned tx blob to db transaction: ", result).c_str()));
@@ -844,7 +849,7 @@ uint64_t BlockchainLMDB::add_transaction_data(const crypto::hash& blk_hash, cons
   if (pruned.size() > blob.size())
     throw0(DB_ERROR("pruned tx size is larger than tx size"));
   cryptonote::blobdata prunable(blob.data() + pruned.size(), blob.size() - pruned.size());
-  MDB_val_copy<blobdata> prunable_blob(prunable);
+  MDB_val_sized(prunable_blob, prunable);
   result = mdb_cursor_put(m_cur_txs_prunable, &val_tx_id, &prunable_blob, MDB_APPEND);
   if (result)
     throw0(DB_ERROR(lmdb_error("Failed to add prunable tx blob to db transaction: ", result).c_str()));
@@ -1331,7 +1336,7 @@ void BlockchainLMDB::open(const std::string& filename, const int db_flags)
 
   bool compatible = true;
 
-  MDB_val_copy<const char*> k("version");
+  MDB_val_str(k, "version");
   MDB_val v;
   auto get_result = mdb_get(txn, m_properties, &k, &v);
   if(get_result == MDB_SUCCESS)
@@ -1379,7 +1384,7 @@ void BlockchainLMDB::open(const std::string& filename, const int db_flags)
     // only write version on an empty DB
     if (m_height == 0)
     {
-      MDB_val_copy<const char*> k("version");
+      MDB_val_str(k, "version");
       MDB_val_copy<uint32_t> v(VERSION);
       auto put_result = mdb_put(txn, m_properties, &k, &v, 0);
       if (put_result != MDB_SUCCESS)
@@ -1476,7 +1481,7 @@ void BlockchainLMDB::reset()
     throw0(DB_ERROR(lmdb_error("Failed to drop m_properties: ", result).c_str()));
 
   // init with current version
-  MDB_val_copy<const char*> k("version");
+  MDB_val_str(k, "version");
   MDB_val_copy<uint32_t> v(VERSION);
   if (auto result = mdb_put(txn, m_properties, &k, &v, 0))
     throw0(DB_ERROR(lmdb_error("Failed to write version to database: ", result).c_str()));
@@ -1591,7 +1596,7 @@ void BlockchainLMDB::unlock()
       auto_txn.commit(); \
   } while(0)
 
-void BlockchainLMDB::add_txpool_tx(const transaction &tx, const txpool_tx_meta_t &meta)
+void BlockchainLMDB::add_txpool_tx(const crypto::hash &txid, const cryptonote::blobdata &blob, const txpool_tx_meta_t &meta)
 {
   LOG_PRINT_L3("BlockchainLMDB::" << __func__);
   check_open();
@@ -1600,8 +1605,6 @@ void BlockchainLMDB::add_txpool_tx(const transaction &tx, const txpool_tx_meta_t
   CURSOR(txpool_meta)
   CURSOR(txpool_blob)
 
-  const crypto::hash txid = get_transaction_hash(tx);
-
   MDB_val k = {sizeof(txid), (void *)&txid};
   MDB_val v = {sizeof(meta), (void *)&meta};
   if (auto result = mdb_cursor_put(m_cur_txpool_meta, &k, &v, MDB_NODUPDATA)) {
@@ -1610,7 +1613,7 @@ void BlockchainLMDB::add_txpool_tx(const transaction &tx, const txpool_tx_meta_t
     else
       throw1(DB_ERROR(lmdb_error("Error adding txpool tx metadata to db transaction: ", result).c_str()));
   }
-  MDB_val_copy<cryptonote::blobdata> blob_val(tx_to_blob(tx));
+  MDB_val_sized(blob_val, blob);
   if (auto result = mdb_cursor_put(m_cur_txpool_blob, &k, &blob_val, MDB_NODUPDATA)) {
     if (result == MDB_KEYEXIST)
       throw1(DB_ERROR("Attempting to add txpool tx blob that's already in the db"));
@@ -3172,6 +3175,7 @@ void BlockchainLMDB::get_output_tx_and_index_from_global(const std::vector<uint6
   LOG_PRINT_L3("BlockchainLMDB::" << __func__);
   check_open();
   tx_out_indices.clear();
+  tx_out_indices.reserve(global_indices.size());
 
   TXN_PREFIX_RDONLY();
   RCURSOR(output_txs);
@@ -3186,9 +3190,8 @@ void BlockchainLMDB::get_output_tx_and_index_from_global(const std::vector<uint6
     else if (get_result)
       throw0(DB_ERROR("DB error attempting to fetch output tx hash"));
 
-    outtx *ot = (outtx *)v.mv_data;
-    auto result = tx_out_index(ot->tx_hash, ot->local_index);
-    tx_out_indices.push_back(result);
+    const outtx *ot = (const outtx *)v.mv_data;
+    tx_out_indices.push_back(tx_out_index(ot->tx_hash, ot->local_index));
   }
 
   TXN_POSTFIX_RDONLY();
@@ -3200,6 +3203,7 @@ void BlockchainLMDB::get_output_key(const uint64_t &amount, const std::vector<ui
   TIME_MEASURE_START(db3);
   check_open();
   outputs.clear();
+  outputs.reserve(offsets.size());
 
   TXN_PREFIX_RDONLY();
 
@@ -3223,19 +3227,19 @@ void BlockchainLMDB::get_output_key(const uint64_t &amount, const std::vector<ui
     else if (get_result)
       throw0(DB_ERROR(lmdb_error("Error attempting to retrieve an output pubkey from the db", get_result).c_str()));
 
-    output_data_t data;
     if (amount == 0)
     {
       const outkey *okp = (const outkey *)v.mv_data;
-      data = okp->data;
+      outputs.push_back(okp->data);
     }
     else
     {
       const pre_rct_outkey *okp = (const pre_rct_outkey *)v.mv_data;
+      outputs.resize(outputs.size() + 1);
+      output_data_t &data = outputs.back();
       memcpy(&data, &okp->data, sizeof(pre_rct_output_data_t));
       data.commitment = rct::zeroCommit(amount);
     }
-    outputs.push_back(data);
   }
 
   TXN_POSTFIX_RDONLY();
@@ -3251,6 +3255,7 @@ void BlockchainLMDB::get_output_tx_and_index(const uint64_t& amount, const std::
   indices.clear();
 
   std::vector <uint64_t> tx_indices;
+  tx_indices.reserve(offsets.size());
   TXN_PREFIX_RDONLY();
 
   RCURSOR(output_amounts);
@@ -4064,7 +4069,7 @@ void BlockchainLMDB::migrate_0_1()
   uint32_t version = 1;
   v.mv_data = (void *)&version;
   v.mv_size = sizeof(version);
-  MDB_val_copy<const char *> vk("version");
+  MDB_val_str(vk, "version");
   result = mdb_txn_begin(m_env, NULL, 0, txn);
   if (result)
     throw0(DB_ERROR(lmdb_error("Failed to create a transaction for the db: ", result).c_str()));
@@ -4206,7 +4211,7 @@ void BlockchainLMDB::migrate_1_2()
   uint32_t version = 2;
   v.mv_data = (void *)&version;
   v.mv_size = sizeof(version);
-  MDB_val_copy<const char *> vk("version");
+  MDB_val_str(vk, "version");
   result = mdb_txn_begin(m_env, NULL, 0, txn);
   if (result)
     throw0(DB_ERROR(lmdb_error("Failed to create a transaction for the db: ", result).c_str()));
@@ -4341,7 +4346,7 @@ void BlockchainLMDB::migrate_2_3()
   uint32_t version = 3;
   v.mv_data = (void *)&version;
   v.mv_size = sizeof(version);
-  MDB_val_copy<const char *> vk("version");
+  MDB_val_str(vk, "version");
   result = mdb_txn_begin(m_env, NULL, 0, txn);
   if (result)
     throw0(DB_ERROR(lmdb_error("Failed to create a transaction for the db: ", result).c_str()));
diff --git a/src/blockchain_db/lmdb/db_lmdb.h b/src/blockchain_db/lmdb/db_lmdb.h
index e1f748ed8..7e76236a5 100644
--- a/src/blockchain_db/lmdb/db_lmdb.h
+++ b/src/blockchain_db/lmdb/db_lmdb.h
@@ -256,7 +256,7 @@ public:
 
   virtual bool has_key_image(const crypto::key_image& img) const;
 
-  virtual void add_txpool_tx(const transaction &tx, const txpool_tx_meta_t& meta);
+  virtual void add_txpool_tx(const crypto::hash &txid, const cryptonote::blobdata &blob, const txpool_tx_meta_t& meta);
   virtual void update_txpool_tx(const crypto::hash &txid, const txpool_tx_meta_t& meta);
   virtual uint64_t get_txpool_tx_count(bool include_unrelayed_txes = true) const;
   virtual bool txpool_has_tx(const crypto::hash &txid) const;
diff --git a/src/common/perf_timer.cpp b/src/common/perf_timer.cpp
index 47f01de65..d9f1f65c1 100644
--- a/src/common/perf_timer.cpp
+++ b/src/common/perf_timer.cpp
@@ -110,6 +110,7 @@ LoggingPerformanceTimer::LoggingPerformanceTimer(const std::string &s, const std
   {
     MCLOG(level, cat.c_str(), "PERF             ----------");
     performance_timers = new std::vector<LoggingPerformanceTimer*>();
+    performance_timers->reserve(16); // how deep before realloc
   }
   else
   {
diff --git a/src/cryptonote_core/blockchain.cpp b/src/cryptonote_core/blockchain.cpp
index e908c2012..19cc90b61 100644
--- a/src/cryptonote_core/blockchain.cpp
+++ b/src/cryptonote_core/blockchain.cpp
@@ -3786,8 +3786,7 @@ bool Blockchain::cleanup_handle_incoming_blocks(bool force_sync)
 }
 
 //------------------------------------------------------------------
-//FIXME: unused parameter txs
-void Blockchain::output_scan_worker(const uint64_t amount, const std::vector<uint64_t> &offsets, std::vector<output_data_t> &outputs, std::unordered_map<crypto::hash, cryptonote::transaction> &txs) const
+void Blockchain::output_scan_worker(const uint64_t amount, const std::vector<uint64_t> &offsets, std::vector<output_data_t> &outputs) const
 {
   try
   {
@@ -4164,21 +4163,19 @@ bool Blockchain::prepare_handle_incoming_blocks(const std::vector<block_complete
     offsets.second.erase(last, offsets.second.end());
   }
 
-  // [output] stores all transactions for each tx_out_index::hash found
-  std::vector<std::unordered_map<crypto::hash, cryptonote::transaction>> transactions(amounts.size());
-
+  // gather all the output keys
   threads = tpool.get_max_concurrency();
   if (!m_db->can_thread_bulk_indices())
     threads = 1;
 
-  if (threads > 1)
+  if (threads > 1 && amounts.size() > 1)
   {
     tools::threadpool::waiter waiter;
 
     for (size_t i = 0; i < amounts.size(); i++)
     {
       uint64_t amount = amounts[i];
-      tpool.submit(&waiter, boost::bind(&Blockchain::output_scan_worker, this, amount, std::cref(offset_map[amount]), std::ref(tx_map[amount]), std::ref(transactions[i])), true);
+      tpool.submit(&waiter, boost::bind(&Blockchain::output_scan_worker, this, amount, std::cref(offset_map[amount]), std::ref(tx_map[amount])), true);
     }
     waiter.wait(&tpool);
   }
@@ -4187,7 +4184,7 @@ bool Blockchain::prepare_handle_incoming_blocks(const std::vector<block_complete
     for (size_t i = 0; i < amounts.size(); i++)
     {
       uint64_t amount = amounts[i];
-      output_scan_worker(amount, offset_map[amount], tx_map[amount], transactions[i]);
+      output_scan_worker(amount, offset_map[amount], tx_map[amount]);
     }
   }
 
@@ -4254,9 +4251,9 @@ bool Blockchain::prepare_handle_incoming_blocks(const std::vector<block_complete
   return true;
 }
 
-void Blockchain::add_txpool_tx(transaction &tx, const txpool_tx_meta_t &meta)
+void Blockchain::add_txpool_tx(const crypto::hash &txid, const cryptonote::blobdata &blob, const txpool_tx_meta_t &meta)
 {
-  m_db->add_txpool_tx(tx, meta);
+  m_db->add_txpool_tx(txid, blob, meta);
 }
 
 void Blockchain::update_txpool_tx(const crypto::hash &txid, const txpool_tx_meta_t &meta)
diff --git a/src/cryptonote_core/blockchain.h b/src/cryptonote_core/blockchain.h
index f140d7719..dfe833fb4 100644
--- a/src/cryptonote_core/blockchain.h
+++ b/src/cryptonote_core/blockchain.h
@@ -916,11 +916,9 @@ namespace cryptonote
      * @param amount the amount
      * @param offsets the indices (indexed to the amount) of the outputs
      * @param outputs return-by-reference the outputs collected
-     * @param txs unused, candidate for removal
      */
     void output_scan_worker(const uint64_t amount,const std::vector<uint64_t> &offsets,
-        std::vector<output_data_t> &outputs, std::unordered_map<crypto::hash,
-        cryptonote::transaction> &txs) const;
+        std::vector<output_data_t> &outputs) const;
 
     /**
      * @brief computes the "short" and "long" hashes for a set of blocks
@@ -939,7 +937,7 @@ namespace cryptonote
      */
     std::list<std::pair<block_extended_info,std::vector<crypto::hash>>> get_alternative_chains() const;
 
-    void add_txpool_tx(transaction &tx, const txpool_tx_meta_t &meta);
+    void add_txpool_tx(const crypto::hash &txid, const cryptonote::blobdata &blob, const txpool_tx_meta_t &meta);
     void update_txpool_tx(const crypto::hash &txid, const txpool_tx_meta_t &meta);
     void remove_txpool_tx(const crypto::hash &txid);
     uint64_t get_txpool_tx_count(bool include_unrelayed_txes = true) const;
diff --git a/src/cryptonote_core/cryptonote_core.cpp b/src/cryptonote_core/cryptonote_core.cpp
index c405c996a..10ab3fe65 100644
--- a/src/cryptonote_core/cryptonote_core.cpp
+++ b/src/cryptonote_core/cryptonote_core.cpp
@@ -909,7 +909,7 @@ namespace cryptonote
       }
 
       const size_t weight = get_transaction_weight(results[i].tx, it->size());
-      ok &= add_new_tx(results[i].tx, results[i].hash, results[i].prefix_hash, weight, tvc[i], keeped_by_block, relayed, do_not_relay);
+      ok &= add_new_tx(results[i].tx, results[i].hash, tx_blobs[i], results[i].prefix_hash, weight, tvc[i], keeped_by_block, relayed, do_not_relay);
       if(tvc[i].m_verifivation_failed)
       {MERROR_VER("Transaction verification failed: " << results[i].hash);}
       else if(tvc[i].m_verifivation_impossible)
@@ -1127,7 +1127,7 @@ namespace cryptonote
     blobdata bl;
     t_serializable_object_to_blob(tx, bl);
     size_t tx_weight = get_transaction_weight(tx, bl.size());
-    return add_new_tx(tx, tx_hash, tx_prefix_hash, tx_weight, tvc, keeped_by_block, relayed, do_not_relay);
+    return add_new_tx(tx, tx_hash, bl, tx_prefix_hash, tx_weight, tvc, keeped_by_block, relayed, do_not_relay);
   }
   //-----------------------------------------------------------------------------------------------
   size_t core::get_blockchain_total_transactions() const
@@ -1135,7 +1135,7 @@ namespace cryptonote
     return m_blockchain_storage.get_total_transactions();
   }
   //-----------------------------------------------------------------------------------------------
-  bool core::add_new_tx(transaction& tx, const crypto::hash& tx_hash, const crypto::hash& tx_prefix_hash, size_t tx_weight, tx_verification_context& tvc, bool keeped_by_block, bool relayed, bool do_not_relay)
+  bool core::add_new_tx(transaction& tx, const crypto::hash& tx_hash, const cryptonote::blobdata &blob, const crypto::hash& tx_prefix_hash, size_t tx_weight, tx_verification_context& tvc, bool keeped_by_block, bool relayed, bool do_not_relay)
   {
     if (keeped_by_block)
       get_blockchain_storage().on_new_tx_from_block(tx);
@@ -1153,7 +1153,7 @@ namespace cryptonote
     }
 
     uint8_t version = m_blockchain_storage.get_current_hard_fork_version();
-    return m_mempool.add_tx(tx, tx_hash, tx_weight, tvc, keeped_by_block, relayed, do_not_relay, version);
+    return m_mempool.add_tx(tx, tx_hash, blob, tx_weight, tvc, keeped_by_block, relayed, do_not_relay, version);
   }
   //-----------------------------------------------------------------------------------------------
   bool core::relay_txpool_transactions()
diff --git a/src/cryptonote_core/cryptonote_core.h b/src/cryptonote_core/cryptonote_core.h
index 4eca2a57b..2eb6c842b 100644
--- a/src/cryptonote_core/cryptonote_core.h
+++ b/src/cryptonote_core/cryptonote_core.h
@@ -783,13 +783,14 @@ namespace cryptonote
       * @copydoc add_new_tx(transaction&, tx_verification_context&, bool)
       *
       * @param tx_hash the transaction's hash
+      * @param blob the transaction as a blob
       * @param tx_prefix_hash the transaction prefix' hash
       * @param tx_weight the weight of the transaction
       * @param relayed whether or not the transaction was relayed to us
       * @param do_not_relay whether to prevent the transaction from being relayed
       *
       */
-     bool add_new_tx(transaction& tx, const crypto::hash& tx_hash, const crypto::hash& tx_prefix_hash, size_t tx_weight, tx_verification_context& tvc, bool keeped_by_block, bool relayed, bool do_not_relay);
+     bool add_new_tx(transaction& tx, const crypto::hash& tx_hash, const cryptonote::blobdata &blob, const crypto::hash& tx_prefix_hash, size_t tx_weight, tx_verification_context& tvc, bool keeped_by_block, bool relayed, bool do_not_relay);
 
      /**
       * @brief add a new transaction to the transaction pool
diff --git a/src/cryptonote_core/tx_pool.cpp b/src/cryptonote_core/tx_pool.cpp
index 70f7e8328..2d340dd41 100644
--- a/src/cryptonote_core/tx_pool.cpp
+++ b/src/cryptonote_core/tx_pool.cpp
@@ -111,7 +111,7 @@ namespace cryptonote
 
   }
   //---------------------------------------------------------------------------------
-  bool tx_memory_pool::add_tx(transaction &tx, /*const crypto::hash& tx_prefix_hash,*/ const crypto::hash &id, size_t tx_weight, tx_verification_context& tvc, bool kept_by_block, bool relayed, bool do_not_relay, uint8_t version)
+  bool tx_memory_pool::add_tx(transaction &tx, /*const crypto::hash& tx_prefix_hash,*/ const crypto::hash &id, const cryptonote::blobdata &blob, size_t tx_weight, tx_verification_context& tvc, bool kept_by_block, bool relayed, bool do_not_relay, uint8_t version)
   {
     // this should already be called with that lock, but let's make it explicit for clarity
     CRITICAL_REGION_LOCAL(m_transactions_lock);
@@ -247,9 +247,11 @@ namespace cryptonote
         memset(meta.padding, 0, sizeof(meta.padding));
         try
         {
+          if (kept_by_block)
+            m_parsed_tx_cache.insert(std::make_pair(id, tx));
           CRITICAL_REGION_LOCAL1(m_blockchain);
           LockedTXN lock(m_blockchain);
-          m_blockchain.add_txpool_tx(tx, meta);
+          m_blockchain.add_txpool_tx(id, blob, meta);
           if (!insert_key_images(tx, id, kept_by_block))
             return false;
           m_txs_by_fee_and_receive_time.emplace(std::pair<double, std::time_t>(fee / (double)tx_weight, receive_time), id);
@@ -288,12 +290,13 @@ namespace cryptonote
 
       try
       {
+        if (kept_by_block)
+          m_parsed_tx_cache.insert(std::make_pair(id, tx));
         CRITICAL_REGION_LOCAL1(m_blockchain);
         LockedTXN lock(m_blockchain);
-        const crypto::hash txid = get_transaction_hash(tx);
-        m_blockchain.remove_txpool_tx(txid);
-        m_blockchain.add_txpool_tx(tx, meta);
-        if (!insert_key_images(tx, txid, kept_by_block))
+        m_blockchain.remove_txpool_tx(id);
+        m_blockchain.add_txpool_tx(id, blob, meta);
+        if (!insert_key_images(tx, id, kept_by_block))
           return false;
         m_txs_by_fee_and_receive_time.emplace(std::pair<double, std::time_t>(fee / (double)tx_weight, receive_time), id);
       }
@@ -324,9 +327,11 @@ namespace cryptonote
   {
     crypto::hash h = null_hash;
     size_t blob_size = 0;
-    if (!get_transaction_hash(tx, h, blob_size) || blob_size == 0)
+    cryptonote::blobdata bl;
+    t_serializable_object_to_blob(tx, bl);
+    if (bl.size() == 0 || !get_transaction_hash(tx, h))
       return false;
-    return add_tx(tx, h, get_transaction_weight(tx, blob_size), tvc, keeped_by_block, relayed, do_not_relay, version);
+    return add_tx(tx, h, bl, get_transaction_weight(tx, bl.size()), tvc, keeped_by_block, relayed, do_not_relay, version);
   }
   //---------------------------------------------------------------------------------
   size_t tx_memory_pool::get_txpool_weight() const
@@ -467,7 +472,12 @@ namespace cryptonote
         return false;
       }
       cryptonote::blobdata txblob = m_blockchain.get_txpool_tx_blob(id);
-      if (!parse_and_validate_tx_from_blob(txblob, tx))
+      auto ci = m_parsed_tx_cache.find(id);
+      if (ci != m_parsed_tx_cache.end())
+      {
+        tx = ci->second;
+      }
+      else if (!parse_and_validate_tx_from_blob(txblob, tx))
       {
         MERROR("Failed to parse tx from txpool");
         return false;
@@ -910,6 +920,7 @@ namespace cryptonote
   {
     CRITICAL_REGION_LOCAL(m_transactions_lock);
     m_input_cache.clear();
+    m_parsed_tx_cache.clear();
     return true;
   }
   //---------------------------------------------------------------------------------
@@ -917,6 +928,7 @@ namespace cryptonote
   {
     CRITICAL_REGION_LOCAL(m_transactions_lock);
     m_input_cache.clear();
+    m_parsed_tx_cache.clear();
     return true;
   }
   //---------------------------------------------------------------------------------
diff --git a/src/cryptonote_core/tx_pool.h b/src/cryptonote_core/tx_pool.h
index 7a0cc23bf..6270a30bf 100644
--- a/src/cryptonote_core/tx_pool.h
+++ b/src/cryptonote_core/tx_pool.h
@@ -107,7 +107,7 @@ namespace cryptonote
      * @param id the transaction's hash
      * @param tx_weight the transaction's weight
      */
-    bool add_tx(transaction &tx, const crypto::hash &id, size_t tx_weight, tx_verification_context& tvc, bool kept_by_block, bool relayed, bool do_not_relay, uint8_t version);
+    bool add_tx(transaction &tx, const crypto::hash &id, const cryptonote::blobdata &blob, size_t tx_weight, tx_verification_context& tvc, bool kept_by_block, bool relayed, bool do_not_relay, uint8_t version);
 
     /**
      * @brief add a transaction to the transaction pool
@@ -584,6 +584,8 @@ private:
     size_t m_txpool_weight;
 
     mutable std::unordered_map<crypto::hash, std::tuple<bool, tx_verification_context, uint64_t, crypto::hash>> m_input_cache;
+
+    std::unordered_map<crypto::hash, transaction> m_parsed_tx_cache;
   };
 }