Fix exceptions not finding txpool txes when relaying

src/blockchain_db/blockchain_db.h

@@ -1333,10 +1333,11 @@ public:
    * @brief get a txpool transaction's metadata
    *
    * @param txid the transaction id of the transation to lookup
+   * @param meta the metadata to return
    *
-   * @return the metadata associated with that transaction
+   * @return true if the tx meta was found, false otherwise
    */
-  virtual txpool_tx_meta_t get_txpool_tx_meta(const crypto::hash& txid) const = 0;
+  virtual bool get_txpool_tx_meta(const crypto::hash& txid, txpool_tx_meta_t &meta) const = 0;
 
   /**
    * @brief get a txpool transaction's blob

src/blockchain_db/lmdb/db_lmdb.cpp

@@ -1621,7 +1621,7 @@ void BlockchainLMDB::remove_txpool_tx(const crypto::hash& txid)
   }
 }
 
-txpool_tx_meta_t BlockchainLMDB::get_txpool_tx_meta(const crypto::hash& txid) const
+bool BlockchainLMDB::get_txpool_tx_meta(const crypto::hash& txid, txpool_tx_meta_t &meta) const
 {
   LOG_PRINT_L3("BlockchainLMDB::" << __func__);
   check_open();
@@ -1632,12 +1632,14 @@ txpool_tx_meta_t BlockchainLMDB::get_txpool_tx_meta(const crypto::hash& txid) co
   MDB_val k = {sizeof(txid), (void *)&txid};
   MDB_val v;
   auto result = mdb_cursor_get(m_cur_txpool_meta, &k, &v, MDB_SET);
+  if (result == MDB_NOTFOUND)
+      return false;
   if (result != 0)
       throw1(DB_ERROR(lmdb_error("Error finding txpool tx meta: ", result).c_str()));
 
-  const txpool_tx_meta_t meta = *(const txpool_tx_meta_t*)v.mv_data;
+  meta = *(const txpool_tx_meta_t*)v.mv_data;
   TXN_POSTFIX_RDONLY();
-  return meta;
+  return true;
 }
 
 bool BlockchainLMDB::get_txpool_tx_blob(const crypto::hash& txid, cryptonote::blobdata &bd) const

src/blockchain_db/lmdb/db_lmdb.h

@@ -246,7 +246,7 @@ public:
   virtual uint64_t get_txpool_tx_count(bool include_unrelayed_txes = true) const;
   virtual bool txpool_has_tx(const crypto::hash &txid) const;
   virtual void remove_txpool_tx(const crypto::hash& txid);
-  virtual txpool_tx_meta_t get_txpool_tx_meta(const crypto::hash& txid) const;
+  virtual bool get_txpool_tx_meta(const crypto::hash& txid, txpool_tx_meta_t &meta) const;
   virtual bool get_txpool_tx_blob(const crypto::hash& txid, cryptonote::blobdata &bd) const;
   virtual cryptonote::blobdata get_txpool_tx_blob(const crypto::hash& txid) const;
   virtual bool for_all_txpool_txes(std::function<bool(const crypto::hash&, const txpool_tx_meta_t&, const cryptonote::blobdata*)> f, bool include_blob = false, bool include_unrelayed_txes = true) const;

src/cryptonote_core/blockchain.cpp

@@ -4236,9 +4236,9 @@ uint64_t Blockchain::get_txpool_tx_count(bool include_unrelayed_txes) const
   return m_db->get_txpool_tx_count(include_unrelayed_txes);
 }
 
-txpool_tx_meta_t Blockchain::get_txpool_tx_meta(const crypto::hash& txid) const
+bool Blockchain::get_txpool_tx_meta(const crypto::hash& txid, txpool_tx_meta_t &meta) const
 {
-  return m_db->get_txpool_tx_meta(txid);
+  return m_db->get_txpool_tx_meta(txid, meta);
 }
 
 bool Blockchain::get_txpool_tx_blob(const crypto::hash& txid, cryptonote::blobdata &bd) const

src/cryptonote_core/blockchain.h

@@ -940,7 +940,7 @@ namespace cryptonote
     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;
-    txpool_tx_meta_t get_txpool_tx_meta(const crypto::hash& txid) const;
+    bool get_txpool_tx_meta(const crypto::hash& txid, txpool_tx_meta_t &meta) const;
     bool get_txpool_tx_blob(const crypto::hash& txid, cryptonote::blobdata &bd) const;
     cryptonote::blobdata get_txpool_tx_blob(const crypto::hash& txid) const;
     bool for_all_txpool_txes(std::function<bool(const crypto::hash&, const txpool_tx_meta_t&, const cryptonote::blobdata*)>, bool include_blob = false, bool include_unrelayed_txes = true) const;

src/cryptonote_core/tx_pool.cpp

@@ -371,7 +371,12 @@ namespace cryptonote
     try
     {
       LockedTXN lock(m_blockchain);
-      txpool_tx_meta_t meta = m_blockchain.get_txpool_tx_meta(id);
+      txpool_tx_meta_t meta;
+      if (!m_blockchain.get_txpool_tx_meta(id, meta))
+      {
+        MERROR("Failed to find tx in txpool");
+        return false;
+      }
       cryptonote::blobdata txblob = m_blockchain.get_txpool_tx_blob(id);
       if (!parse_and_validate_tx_from_blob(txblob, tx))
       {
@@ -514,11 +519,14 @@ namespace cryptonote
     {
       try
       {
-        txpool_tx_meta_t meta = m_blockchain.get_txpool_tx_meta(it->first);
+        txpool_tx_meta_t meta;
+        if (m_blockchain.get_txpool_tx_meta(it->first, meta))
+        {
           meta.relayed = true;
           meta.last_relayed_time = now;
           m_blockchain.update_txpool_tx(it->first, meta);
         }
+      }
       catch (const std::exception &e)
       {
         MERROR("Failed to update txpool transaction metadata: " << e.what());
@@ -696,7 +704,11 @@ namespace cryptonote
         {
           try
           {
-            meta = m_blockchain.get_txpool_tx_meta(tx_id_hash);
+            if (!m_blockchain.get_txpool_tx_meta(tx_id_hash, meta))
+            {
+              MERROR("Failed to get tx meta from txpool");
+              return false;
+            }
             if (!meta.relayed)
               // Do not include that transaction if in restricted mode and it's not relayed
               continue;
@@ -918,7 +930,13 @@ namespace cryptonote
       {
         for (const crypto::hash &txid: it->second)
         {
-          txpool_tx_meta_t meta = m_blockchain.get_txpool_tx_meta(txid);
+          txpool_tx_meta_t meta;
+          if (!m_blockchain.get_txpool_tx_meta(txid, meta))
+          {
+            MERROR("Failed to find tx meta in txpool");
+            // continue, not fatal
+            continue;
+          }
           if (!meta.double_spend_seen)
           {
             MDEBUG("Marking " << txid << " as double spending " << itk.k_image);
@@ -998,7 +1016,12 @@ namespace cryptonote
     auto sorted_it = m_txs_by_fee_and_receive_time.begin();
     while (sorted_it != m_txs_by_fee_and_receive_time.end())
     {
-      txpool_tx_meta_t meta = m_blockchain.get_txpool_tx_meta(sorted_it->second);
+      txpool_tx_meta_t meta;
+      if (!m_blockchain.get_txpool_tx_meta(sorted_it->second, meta))
+      {
+        MERROR("  failed to find tx meta");
+        continue;
+      }
       LOG_PRINT_L2("Considering " << sorted_it->second << ", size " << meta.blob_size << ", current block size " << total_size << "/" << max_total_size << ", current coinbase " << print_money(best_coinbase));
 
       // Can not exceed maximum block size

tests/unit_tests/hardfork.cpp

@@ -118,7 +118,7 @@ public:
   virtual uint64_t get_txpool_tx_count(bool include_unrelayed_txes = true) const { return 0; }
   virtual bool txpool_has_tx(const crypto::hash &txid) const { return false; }
   virtual void remove_txpool_tx(const crypto::hash& txid) {}
-  virtual txpool_tx_meta_t get_txpool_tx_meta(const crypto::hash& txid) const { return txpool_tx_meta_t(); }
+  virtual bool get_txpool_tx_meta(const crypto::hash& txid, txpool_tx_meta_t &meta) const { return false; }
   virtual bool get_txpool_tx_blob(const crypto::hash& txid, cryptonote::blobdata &bd) const { return false; }
   virtual cryptonote::blobdata get_txpool_tx_blob(const crypto::hash& txid) const { return ""; }
   virtual bool for_all_txpool_txes(std::function<bool(const crypto::hash&, const txpool_tx_meta_t&, const cryptonote::blobdata*)>, bool include_blob = false, bool include_unrelayed_txes = false) const { return false; }