db_bdb: add versioning, to detect incompatible format changes
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2 changed files with 83 additions and 0 deletions
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@ -38,6 +38,10 @@
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using epee::string_tools::pod_to_hex;
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#define DB_DEFAULT_TX (m_write_txn != nullptr ? *m_write_txn : (DbTxn*) nullptr)
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// Increase when the DB changes in a non backward compatible way, and there
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// is no automatic conversion, so that a full resync is needed.
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#define VERSION 0
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namespace
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{
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@ -121,6 +125,8 @@ const char* const BDB_SPENT_KEYS = "spent_keys";
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const char* const BDB_HF_STARTING_HEIGHTS = "hf_starting_heights";
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const char* const BDB_HF_VERSIONS = "hf_versions";
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const char* const BDB_PROPERTIES = "properties";
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const unsigned int MB = 1024 * 1024;
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// ND: FIXME: db keeps running out of locks when doing full syncs. Possible bug??? Set it to 5K for now.
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const unsigned int DB_MAX_LOCKS = 5000;
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@ -180,6 +186,22 @@ private:
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std::unique_ptr<char[]> m_data;
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};
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template<>
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struct Dbt_copy<const char*>: public Dbt
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{
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Dbt_copy(const char *s) :
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m_data(strdup(s))
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{
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size_t len = strlen(s) + 1; // include the NUL, makes it easier for compare
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set_data(m_data.get());
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set_size(len);
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set_ulen(len);
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set_flags(DB_DBT_USERMEM);
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}
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private:
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std::unique_ptr<char[]> m_data;
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};
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struct Dbt_safe : public Dbt
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{
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Dbt_safe()
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@ -793,6 +815,8 @@ void BlockchainBDB::open(const std::string& filename, const int db_flags)
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m_hf_starting_heights = new Db(m_env, 0);
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m_hf_versions = new Db(m_env, 0);
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m_properties = new Db(m_env, 0);
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// Tell DB about Dbs that need duplicate support
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// Note: no need to tell about sorting,
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// as the default is insertion order, which we want
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@ -845,6 +869,8 @@ void BlockchainBDB::open(const std::string& filename, const int db_flags)
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m_hf_starting_heights->open(txn, BDB_HF_STARTING_HEIGHTS, NULL, DB_RECNO, DB_CREATE, 0);
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m_hf_versions->open(txn, BDB_HF_VERSIONS, NULL, DB_RECNO, DB_CREATE, 0);
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m_properties->open(txn, BDB_PROPERTIES, NULL, DB_HASH, DB_CREATE, 0);
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txn.commit();
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DB_BTREE_STAT* stats;
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@ -865,6 +891,56 @@ void BlockchainBDB::open(const std::string& filename, const int db_flags)
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m_num_outputs = stats->bt_nkeys;
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delete stats;
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// checks for compatibility
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bool compatible = true;
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Dbt_copy<const char*> key("version");
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Dbt_copy<uint32_t> result;
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auto get_result = m_properties->get(DB_DEFAULT_TX, &key, &result, 0);
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if (get_result == 0)
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{
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if (result > VERSION)
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{
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LOG_PRINT_RED_L0("Existing BerkeleyDB database was made by a later version. We don't know how it will change yet.");
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compatible = false;
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}
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else if (VERSION > 0 && result < VERSION)
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{
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compatible = false;
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}
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}
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else
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{
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// if not found, but we're on version 0, it's fine. If the DB's empty, it's fine too.
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if (VERSION > 0 && m_height > 0)
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compatible = false;
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}
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if (!compatible)
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{
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m_open = false;
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LOG_PRINT_RED_L0("Existing BerkeleyDB database is incompatible with this version.");
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LOG_PRINT_RED_L0("Please delete the existing database and resync.");
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return;
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}
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if (1 /* this can't be set readonly atm */)
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{
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// only write version on an empty DB
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if (m_height == 0)
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{
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Dbt_copy<const char*> k("version");
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Dbt_copy<uint32_t> v(VERSION);
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auto put_result = m_properties->put(DB_DEFAULT_TX, &k, &v, 0);
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if (put_result != 0)
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{
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m_open = false;
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LOG_PRINT_RED_L0("Failed to write version to database.");
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return;
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}
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}
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}
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// run checkpoint thread
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m_run_checkpoint = true;
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m_checkpoint_thread.reset(new boost::thread(&BlockchainBDB::checkpoint_worker, this));
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@ -920,6 +996,8 @@ void BlockchainBDB::sync()
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m_hf_starting_heights->sync(0);
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m_hf_versions->sync(0);
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m_properties->sync(0);
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}
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catch (const std::exception& e)
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{
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@ -1000,6 +1078,9 @@ std::vector<std::string> BlockchainBDB::get_filenames() const
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m_hf_versions->get_dbname(pfname, pdbname);
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filenames.push_back(fname);
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m_properties->get_dbname(pfname, pdbname);
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filenames.push_back(fname);
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std::vector<std::string> full_paths;
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for (auto& filename : filenames)
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@ -445,6 +445,8 @@ private:
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Db* m_hf_starting_heights;
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Db* m_hf_versions;
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Db* m_properties;
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uint64_t m_height;
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uint64_t m_num_outputs;
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std::string m_folder;
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