From 5e673c03fec66024027b94229fa2e317d7767a20 Mon Sep 17 00:00:00 2001 From: moneromooo-monero Date: Fri, 5 Apr 2019 09:28:30 +0000 Subject: [PATCH] blockchain_db: fix db txn ending too early The db txn in add_block ending caused the entire overarching batch txn to stop. Also add a new guard class so a db txn can be stopped in the face of exceptions. Also use a read only db txn in init when the db itself is read only, and do not save the max tx size in that case. --- src/blockchain_db/blockchain_db.cpp | 4 -- src/blockchain_db/blockchain_db.h | 55 +++++++++++++++++++-- src/blockchain_db/lmdb/db_lmdb.cpp | 76 ++++++++++++----------------- src/blockchain_db/lmdb/db_lmdb.h | 11 +++-- src/blockchain_db/testdb.h | 10 ++-- src/cryptonote_basic/hardfork.cpp | 8 +-- src/cryptonote_core/blockchain.cpp | 52 +++++++++----------- tests/core_tests/chaingen.h | 19 +++++++- tests/unit_tests/blockchain_db.cpp | 4 ++ 9 files changed, 144 insertions(+), 95 deletions(-) diff --git a/src/blockchain_db/blockchain_db.cpp b/src/blockchain_db/blockchain_db.cpp index d772bf4bb..2b039f557 100644 --- a/src/blockchain_db/blockchain_db.cpp +++ b/src/blockchain_db/blockchain_db.cpp @@ -211,8 +211,6 @@ uint64_t BlockchainDB::add_block( const std::pair& blck if (blk.tx_hashes.size() != txs.size()) throw std::runtime_error("Inconsistent tx/hashes sizes"); - block_txn_start(false); - TIME_MEASURE_START(time1); crypto::hash blk_hash = get_block_hash(blk); TIME_MEASURE_FINISH(time1); @@ -252,8 +250,6 @@ uint64_t BlockchainDB::add_block( const std::pair& blck m_hardfork->add(blk, prev_height); - block_txn_stop(); - ++num_calls; return prev_height; diff --git a/src/blockchain_db/blockchain_db.h b/src/blockchain_db/blockchain_db.h index 2c40b5a78..567be6a65 100644 --- a/src/blockchain_db/blockchain_db.h +++ b/src/blockchain_db/blockchain_db.h @@ -770,9 +770,12 @@ public: */ virtual void set_batch_transactions(bool) = 0; - virtual void block_txn_start(bool readonly=false) = 0; - virtual void block_txn_stop() = 0; - virtual void block_txn_abort() = 0; + virtual void block_wtxn_start() = 0; + virtual void block_wtxn_stop() = 0; + virtual void block_wtxn_abort() = 0; + virtual bool block_rtxn_start() const = 0; + virtual void block_rtxn_stop() const = 0; + virtual void block_rtxn_abort() const = 0; virtual void set_hard_fork(HardFork* hf); @@ -1699,6 +1702,52 @@ public: }; // class BlockchainDB +class db_txn_guard +{ +public: + db_txn_guard(BlockchainDB *db, bool readonly): db(db), readonly(readonly), active(false) + { + if (readonly) + { + active = db->block_rtxn_start(); + } + else + { + db->block_wtxn_start(); + active = true; + } + } + virtual ~db_txn_guard() + { + if (active) + stop(); + } + void stop() + { + if (readonly) + db->block_rtxn_stop(); + else + db->block_wtxn_stop(); + active = false; + } + void abort() + { + if (readonly) + db->block_rtxn_abort(); + else + db->block_wtxn_abort(); + active = false; + } + +private: + BlockchainDB *db; + bool readonly; + bool active; +}; + +class db_rtxn_guard: public db_txn_guard { public: db_rtxn_guard(BlockchainDB *db): db_txn_guard(db, true) {} }; +class db_wtxn_guard: public db_txn_guard { public: db_wtxn_guard(BlockchainDB *db): db_txn_guard(db, false) {} }; + BlockchainDB *new_db(const std::string& db_type); } // namespace cryptonote diff --git a/src/blockchain_db/lmdb/db_lmdb.cpp b/src/blockchain_db/lmdb/db_lmdb.cpp index a07e9ac55..340434888 100644 --- a/src/blockchain_db/lmdb/db_lmdb.cpp +++ b/src/blockchain_db/lmdb/db_lmdb.cpp @@ -3611,16 +3611,15 @@ void BlockchainLMDB::block_rtxn_stop() const memset(&m_tinfo->m_ti_rflags, 0, sizeof(m_tinfo->m_ti_rflags)); } -void BlockchainLMDB::block_txn_start(bool readonly) +bool BlockchainLMDB::block_rtxn_start() const { - if (readonly) - { - MDB_txn *mtxn; - mdb_txn_cursors *mcur; - block_rtxn_start(&mtxn, &mcur); - return; - } + MDB_txn *mtxn; + mdb_txn_cursors *mcur; + return block_rtxn_start(&mtxn, &mcur); +} +void BlockchainLMDB::block_wtxn_start() +{ LOG_PRINT_L3("BlockchainLMDB::" << __func__); // Distinguish the exceptions here from exceptions that would be thrown while // using the txn and committing it. @@ -3652,10 +3651,13 @@ void BlockchainLMDB::block_txn_start(bool readonly) throw0(DB_ERROR_TXN_START((std::string("Attempted to start new write txn when batch txn already exists in ")+__FUNCTION__).c_str())); } -void BlockchainLMDB::block_txn_stop() +void BlockchainLMDB::block_wtxn_stop() { LOG_PRINT_L3("BlockchainLMDB::" << __func__); - if (m_write_txn && m_writer == boost::this_thread::get_id()) + if (!m_write_txn) + throw0(DB_ERROR_TXN_START((std::string("Attempted to stop write txn when no such txn exists in ")+__FUNCTION__).c_str())); + if (m_writer != boost::this_thread::get_id()) + throw0(DB_ERROR_TXN_START((std::string("Attempted to stop write txn from the wrong thread in ")+__FUNCTION__).c_str())); { if (! m_batch_active) { @@ -3669,38 +3671,29 @@ void BlockchainLMDB::block_txn_stop() memset(&m_wcursors, 0, sizeof(m_wcursors)); } } - else if (m_tinfo->m_ti_rtxn) +} + +void BlockchainLMDB::block_wtxn_abort() +{ + LOG_PRINT_L3("BlockchainLMDB::" << __func__); + if (!m_write_txn) + throw0(DB_ERROR_TXN_START((std::string("Attempted to abort write txn when no such txn exists in ")+__FUNCTION__).c_str())); + if (m_writer != boost::this_thread::get_id()) + throw0(DB_ERROR_TXN_START((std::string("Attempted to abort write txn from the wrong thread in ")+__FUNCTION__).c_str())); + + if (! m_batch_active) { - mdb_txn_reset(m_tinfo->m_ti_rtxn); - memset(&m_tinfo->m_ti_rflags, 0, sizeof(m_tinfo->m_ti_rflags)); + delete m_write_txn; + m_write_txn = nullptr; + memset(&m_wcursors, 0, sizeof(m_wcursors)); } } -void BlockchainLMDB::block_txn_abort() +void BlockchainLMDB::block_rtxn_abort() const { LOG_PRINT_L3("BlockchainLMDB::" << __func__); - if (m_write_txn && m_writer == boost::this_thread::get_id()) - { - if (! m_batch_active) - { - delete m_write_txn; - m_write_txn = nullptr; - memset(&m_wcursors, 0, sizeof(m_wcursors)); - } - } - else if (m_tinfo->m_ti_rtxn) - { - mdb_txn_reset(m_tinfo->m_ti_rtxn); - memset(&m_tinfo->m_ti_rflags, 0, sizeof(m_tinfo->m_ti_rflags)); - } - else - { - // This would probably mean an earlier exception was caught, but then we - // proceeded further than we should have. - throw0(DB_ERROR((std::string("BlockchainLMDB::") + __func__ + - std::string(": block-level DB transaction abort called when write txn doesn't exist") - ).c_str())); - } + mdb_txn_reset(m_tinfo->m_ti_rtxn); + memset(&m_tinfo->m_ti_rflags, 0, sizeof(m_tinfo->m_ti_rflags)); } uint64_t BlockchainLMDB::add_block(const std::pair& blk, size_t block_weight, uint64_t long_term_block_weight, const difficulty_type& cumulative_difficulty, const uint64_t& coins_generated, @@ -3728,11 +3721,6 @@ uint64_t BlockchainLMDB::add_block(const std::pair& blk, size_t { throw; } - catch (...) - { - block_txn_abort(); - throw; - } return ++m_height; } @@ -3742,16 +3730,16 @@ void BlockchainLMDB::pop_block(block& blk, std::vector& txs) LOG_PRINT_L3("BlockchainLMDB::" << __func__); check_open(); - block_txn_start(false); + block_wtxn_start(); try { BlockchainDB::pop_block(blk, txs); - block_txn_stop(); + block_wtxn_stop(); } catch (...) { - block_txn_abort(); + block_wtxn_abort(); throw; } } diff --git a/src/blockchain_db/lmdb/db_lmdb.h b/src/blockchain_db/lmdb/db_lmdb.h index f6b00817d..4b46f081e 100644 --- a/src/blockchain_db/lmdb/db_lmdb.h +++ b/src/blockchain_db/lmdb/db_lmdb.h @@ -310,11 +310,14 @@ public: virtual void batch_stop(); virtual void batch_abort(); - virtual void block_txn_start(bool readonly); - virtual void block_txn_stop(); - virtual void block_txn_abort(); - virtual bool block_rtxn_start(MDB_txn **mtxn, mdb_txn_cursors **mcur) const; + virtual void block_wtxn_start(); + virtual void block_wtxn_stop(); + virtual void block_wtxn_abort(); + virtual bool block_rtxn_start() const; virtual void block_rtxn_stop() const; + virtual void block_rtxn_abort() const; + + bool block_rtxn_start(MDB_txn **mtxn, mdb_txn_cursors **mcur) const; virtual void pop_block(block& blk, std::vector& txs); diff --git a/src/blockchain_db/testdb.h b/src/blockchain_db/testdb.h index 04fad26a4..1492fb2ae 100644 --- a/src/blockchain_db/testdb.h +++ b/src/blockchain_db/testdb.h @@ -55,9 +55,13 @@ public: virtual bool batch_start(uint64_t batch_num_blocks=0, uint64_t batch_bytes=0) { return true; } virtual void batch_stop() {} virtual void set_batch_transactions(bool) {} - virtual void block_txn_start(bool readonly=false) {} - virtual void block_txn_stop() {} - virtual void block_txn_abort() {} + virtual void block_wtxn_start() {} + virtual void block_wtxn_stop() {} + virtual void block_wtxn_abort() {} + virtual bool block_rtxn_start() const { return true; } + virtual void block_rtxn_stop() const {} + virtual void block_rtxn_abort() const {} + virtual void drop_hard_fork_info() {} virtual bool block_exists(const crypto::hash& h, uint64_t *height) const { return false; } virtual cryptonote::blobdata get_block_blob_from_height(const uint64_t& height) const { return cryptonote::t_serializable_object_to_blob(get_block_from_height(height)); } diff --git a/src/cryptonote_basic/hardfork.cpp b/src/cryptonote_basic/hardfork.cpp index 89bca2f09..61240ea37 100644 --- a/src/cryptonote_basic/hardfork.cpp +++ b/src/cryptonote_basic/hardfork.cpp @@ -266,11 +266,9 @@ bool HardFork::reorganize_from_chain_height(uint64_t height) bool HardFork::rescan_from_block_height(uint64_t height) { CRITICAL_REGION_LOCAL(lock); - db.block_txn_start(true); - if (height >= db.height()) { - db.block_txn_stop(); + db_rtxn_guard rtxn_guard(&db); + if (height >= db.height()) return false; - } versions.clear(); @@ -293,8 +291,6 @@ bool HardFork::rescan_from_block_height(uint64_t height) current_fork_index = voted; } - db.block_txn_stop(); - return true; } diff --git a/src/cryptonote_core/blockchain.cpp b/src/cryptonote_core/blockchain.cpp index 7ef8f8c45..670f77d9d 100644 --- a/src/cryptonote_core/blockchain.cpp +++ b/src/cryptonote_core/blockchain.cpp @@ -428,6 +428,7 @@ bool Blockchain::init(BlockchainDB* db, const network_type nettype, bool offline block bl; block_verification_context bvc = boost::value_initialized(); generate_genesis_block(bl, get_config(m_nettype).GENESIS_TX, get_config(m_nettype).GENESIS_NONCE); + db_wtxn_guard wtxn_guard(m_db); add_new_block(bl, bvc); CHECK_AND_ASSERT_MES(!bvc.m_verifivation_failed, false, "Failed to add genesis block to blockchain"); } @@ -443,7 +444,8 @@ bool Blockchain::init(BlockchainDB* db, const network_type nettype, bool offline m_db->fixup(); } - m_db->block_txn_start(true); + db_rtxn_guard rtxn_guard(m_db); + // check how far behind we are uint64_t top_block_timestamp = m_db->get_top_block_timestamp(); uint64_t timestamp_diff = time(NULL) - top_block_timestamp; @@ -464,7 +466,8 @@ bool Blockchain::init(BlockchainDB* db, const network_type nettype, bool offline #endif MINFO("Blockchain initialized. last block: " << m_db->height() - 1 << ", " << epee::misc_utils::get_time_interval_string(timestamp_diff) << " time ago, current difficulty: " << get_difficulty_for_next_block()); - m_db->block_txn_stop(); + + rtxn_guard.stop(); uint64_t num_popped_blocks = 0; while (!m_db->is_read_only()) @@ -518,8 +521,11 @@ bool Blockchain::init(BlockchainDB* db, const network_type nettype, bool offline if (test_options && test_options->long_term_block_weight_window) m_long_term_block_weights_window = test_options->long_term_block_weight_window; - if (!update_next_cumulative_weight_limit()) - return false; + { + db_txn_guard txn_guard(m_db, m_db->is_read_only()); + if (!update_next_cumulative_weight_limit()) + return false; + } return true; } //------------------------------------------------------------------ @@ -725,6 +731,7 @@ bool Blockchain::reset_and_set_genesis_block(const block& b) m_db->reset(); m_hardfork->init(); + db_wtxn_guard wtxn_guard(m_db); block_verification_context bvc = boost::value_initialized(); add_new_block(b, bvc); if (!update_next_cumulative_weight_limit()) @@ -772,7 +779,7 @@ bool Blockchain::get_short_chain_history(std::list& ids) const if(!sz) return true; - m_db->block_txn_start(true); + db_rtxn_guard rtxn_guard(m_db); bool genesis_included = false; uint64_t current_back_offset = 1; while(current_back_offset < sz) @@ -799,7 +806,6 @@ bool Blockchain::get_short_chain_history(std::list& ids) const { ids.push_back(m_db->get_block_hash_from_height(0)); } - m_db->block_txn_stop(); return true; } @@ -1866,7 +1872,7 @@ bool Blockchain::handle_get_objects(NOTIFY_REQUEST_GET_OBJECTS::request& arg, NO { LOG_PRINT_L3("Blockchain::" << __func__); CRITICAL_REGION_LOCAL(m_blockchain_lock); - m_db->block_txn_start(true); + db_rtxn_guard rtxn_guard (m_db); rsp.current_blockchain_height = get_current_blockchain_height(); std::vector> blocks; get_blocks(arg.blocks, blocks, rsp.missed_ids); @@ -1893,7 +1899,6 @@ bool Blockchain::handle_get_objects(NOTIFY_REQUEST_GET_OBJECTS::request& arg, NO // as done below if any standalone transactions were requested // and missed. rsp.missed_ids.insert(rsp.missed_ids.end(), missed_tx_ids.begin(), missed_tx_ids.end()); - m_db->block_txn_stop(); return false; } @@ -1903,7 +1908,6 @@ bool Blockchain::handle_get_objects(NOTIFY_REQUEST_GET_OBJECTS::request& arg, NO //get and pack other transactions, if needed get_transactions_blobs(arg.txs, rsp.txs, rsp.missed_ids); - m_db->block_txn_stop(); return true; } //------------------------------------------------------------------ @@ -2075,14 +2079,13 @@ bool Blockchain::find_blockchain_supplement(const std::list& qbloc return false; } - m_db->block_txn_start(true); + db_rtxn_guard rtxn_guard(m_db); // make sure that the last block in the request's block list matches // the genesis block auto gen_hash = m_db->get_block_hash_from_height(0); if(qblock_ids.back() != gen_hash) { MCERROR("net.p2p", "Client sent wrong NOTIFY_REQUEST_CHAIN: genesis block mismatch: " << std::endl << "id: " << qblock_ids.back() << ", " << std::endl << "expected: " << gen_hash << "," << std::endl << " dropping connection"); - m_db->block_txn_abort(); return false; } @@ -2100,11 +2103,9 @@ bool Blockchain::find_blockchain_supplement(const std::list& qbloc catch (const std::exception& e) { MWARNING("Non-critical error trying to find block by hash in BlockchainDB, hash: " << *bl_it); - m_db->block_txn_abort(); return false; } } - m_db->block_txn_stop(); // this should be impossible, as we checked that we share the genesis block, // but just in case... @@ -2295,7 +2296,7 @@ bool Blockchain::find_blockchain_supplement(const std::list& qbloc return false; } - m_db->block_txn_start(true); + db_rtxn_guard rtxn_guard(m_db); current_height = get_current_blockchain_height(); const uint32_t pruning_seed = get_blockchain_pruning_seed(); start_height = tools::get_next_unpruned_block_height(start_height, current_height, pruning_seed); @@ -2307,7 +2308,6 @@ bool Blockchain::find_blockchain_supplement(const std::list& qbloc hashes.push_back(m_db->get_block_hash_from_height(i)); } - m_db->block_txn_stop(); return true; } @@ -2354,7 +2354,7 @@ bool Blockchain::find_blockchain_supplement(const uint64_t req_start_block, cons } } - m_db->block_txn_start(true); + db_rtxn_guard rtxn_guard(m_db); total_height = get_current_blockchain_height(); size_t count = 0, size = 0; blocks.reserve(std::min(std::min(max_count, (size_t)10000), (size_t)(total_height - start_height))); @@ -2380,7 +2380,6 @@ bool Blockchain::find_blockchain_supplement(const uint64_t req_start_block, cons blocks.back().second.push_back(std::make_pair(b.tx_hashes[i], std::move(txs[i]))); } } - m_db->block_txn_stop(); return true; } //------------------------------------------------------------------ @@ -3535,7 +3534,7 @@ bool Blockchain::handle_block_to_main_chain(const block& bl, const crypto::hash& static bool seen_future_version = false; - m_db->block_txn_start(true); + db_rtxn_guard rtxn_guard(m_db); uint64_t blockchain_height; const crypto::hash top_hash = get_tail_id(blockchain_height); ++blockchain_height; // block height to chain height @@ -3544,7 +3543,6 @@ bool Blockchain::handle_block_to_main_chain(const block& bl, const crypto::hash& MERROR_VER("Block with id: " << id << std::endl << "has wrong prev_id: " << bl.prev_id << std::endl << "expected: " << top_hash); bvc.m_verifivation_failed = true; leave: - m_db->block_txn_stop(); return false; } @@ -3827,7 +3825,7 @@ leave: if(precomputed) block_processing_time += m_fake_pow_calc_time; - m_db->block_txn_stop(); + rtxn_guard.stop(); TIME_MEASURE_START(addblock); uint64_t new_height = 0; if (!bvc.m_verifivation_failed) @@ -3945,8 +3943,6 @@ bool Blockchain::update_next_cumulative_weight_limit(uint64_t *long_term_effecti LOG_PRINT_L3("Blockchain::" << __func__); - m_db->block_txn_start(false); - // when we reach this, the last hf version is not yet written to the db const uint64_t db_height = m_db->height(); const uint8_t hf_version = get_current_hard_fork_version(); @@ -4009,9 +4005,8 @@ bool Blockchain::update_next_cumulative_weight_limit(uint64_t *long_term_effecti if (long_term_effective_median_block_weight) *long_term_effective_median_block_weight = m_long_term_effective_median_block_weight; - m_db->add_max_block_size(m_current_block_cumul_weight_limit); - - m_db->block_txn_stop(); + if (!m_db->is_read_only()) + m_db->add_max_block_size(m_current_block_cumul_weight_limit); return true; } @@ -4022,12 +4017,11 @@ bool Blockchain::add_new_block(const block& bl, block_verification_context& bvc) crypto::hash id = get_block_hash(bl); CRITICAL_REGION_LOCAL(m_tx_pool);//to avoid deadlock lets lock tx_pool for whole add/reorganize process CRITICAL_REGION_LOCAL1(m_blockchain_lock); - m_db->block_txn_start(true); + db_rtxn_guard rtxn_guard(m_db); if(have_block(id)) { LOG_PRINT_L3("block with id = " << id << " already exists"); bvc.m_already_exists = true; - m_db->block_txn_stop(); m_blocks_txs_check.clear(); return false; } @@ -4037,14 +4031,14 @@ bool Blockchain::add_new_block(const block& bl, block_verification_context& bvc) { //chain switching or wrong block bvc.m_added_to_main_chain = false; - m_db->block_txn_stop(); + rtxn_guard.stop(); bool r = handle_alternative_block(bl, id, bvc); m_blocks_txs_check.clear(); return r; //never relay alternative blocks } - m_db->block_txn_stop(); + rtxn_guard.stop(); return handle_block_to_main_chain(bl, id, bvc); } //------------------------------------------------------------------ diff --git a/tests/core_tests/chaingen.h b/tests/core_tests/chaingen.h index f2bcb7787..2ecbdc436 100644 --- a/tests/core_tests/chaingen.h +++ b/tests/core_tests/chaingen.h @@ -643,7 +643,15 @@ public: log_event("cryptonote::block"); cryptonote::block_verification_context bvc = AUTO_VAL_INIT(bvc); - m_c.handle_incoming_block(t_serializable_object_to_blob(b), &b, bvc); + cryptonote::blobdata bd = t_serializable_object_to_blob(b); + std::vector pblocks; + if (m_c.prepare_handle_incoming_blocks(std::vector(1, {bd, {}}), pblocks)) + { + m_c.handle_incoming_block(bd, &b, bvc); + m_c.cleanup_handle_incoming_blocks(); + } + else + bvc.m_verifivation_failed = true; bool r = check_block_verification_context(bvc, m_ev_index, b, m_validator); CHECK_AND_NO_ASSERT_MES(r, false, "block verification context check failed"); return r; @@ -666,7 +674,14 @@ public: log_event("serialized_block"); cryptonote::block_verification_context bvc = AUTO_VAL_INIT(bvc); - m_c.handle_incoming_block(sr_block.data, NULL, bvc); + std::vector pblocks; + if (m_c.prepare_handle_incoming_blocks(std::vector(1, {sr_block.data, {}}), pblocks)) + { + m_c.handle_incoming_block(sr_block.data, NULL, bvc); + m_c.cleanup_handle_incoming_blocks(); + } + else + bvc.m_verifivation_failed = true; cryptonote::block blk; std::stringstream ss; diff --git a/tests/unit_tests/blockchain_db.cpp b/tests/unit_tests/blockchain_db.cpp index 4fbc21ddc..f302d7946 100644 --- a/tests/unit_tests/blockchain_db.cpp +++ b/tests/unit_tests/blockchain_db.cpp @@ -271,6 +271,8 @@ TYPED_TEST(BlockchainDBTest, AddBlock) this->get_filenames(); this->init_hard_fork(); + db_wtxn_guard guard(this->m_db); + // adding a block with no parent in the blockchain should throw. // note: this shouldn't be possible, but is a good (and cheap) failsafe. // @@ -317,6 +319,8 @@ TYPED_TEST(BlockchainDBTest, RetrieveBlockData) this->get_filenames(); this->init_hard_fork(); + db_wtxn_guard guard(this->m_db); + ASSERT_NO_THROW(this->m_db->add_block(this->m_blocks[0], t_sizes[0], t_sizes[0], t_diffs[0], t_coins[0], this->m_txs[0])); ASSERT_EQ(t_sizes[0], this->m_db->get_block_weight(0));