2 Commits (04466b35a5290f82313297dee205680c8feb02cf)

Author	SHA1	Message	Date
Javier Jaramago Fernández	64b16172c7	Change 'COM_STMT_EXECUTE' params length decoding ... According to MySQL protocol, variable length strings are encoded using length encoded integers. For reference, see: - https://dev.mysql.com/doc/dev/mysql-server/9.4.0/page_protocol_com_stmt_execute.html - https://dev.mysql.com/doc/dev/mysql-server/9.4.0/page_protocol_basic_dt_integers.html#a_protocol_type_int2 The protocol specifies that values greater than 2^24 (16777216) should be encoded using '0xFE + 8-byte integer'. Yet, in reality MySQL ignores the upper section of these 8-byte integers, treating them effectively like '4-bytes'. For the sake of compatibility this commit changes the decoding behavior for 'COM_STMT_EXECUTE' to match MySQL one. This different is subtle but important, since in practice MySQL itself doesn't use the '8 bytes' from the field. This means that connectors that are compatible with MySQL could find issues when sending these packets through ProxySQL (like NodeJS 'mysql2' connector which writes the 8-bytes as a 4-bytes duplication, motivating these changes), situation that could result in rejection due to malformed packet detection (or crashes/invalid handling in the worse case scenario). The previous decoding function is now renamed into 'mysql_decode_length_ll' to honor MySQL naming 'net_field_length_ll'. For now, this protocol change is limited to 'COM_STMT_EXECUTE'.	7 months ago
Rahim Kanji	720441af20	Refactored and Optimized Query Cache with PgSQL Support ... * Added Query Cache Support for PgSQL: * Introduced new variables for PgSQL Query Cache management: * pgsql-query_cache_size_MB * pgsql-query_cache_soft_ttl_pct * pgsql-query_cache_stores_empty_result * pgsql-query_cache_handle_warnings (not yet utilized) * Overwriting Transaction Status: * Sending current transaction state to the client when a result is returned from the query cache. * This currently does not differentiate between normal and error transaction states—both are treated as active transaction states. * Cache Lifetime Management: Replaced manual reference counting with std::shared_ptr to efficiently manage the lifecycle of cache entries, ensuring proper memory deallocation and reducing complexity. * Unified Purging Logic: Refactored the query cache purging logic to use a single thread for both MySQL and PgSQL cache entries. * Code Cleanup: Removed unnecessary methods and data members to streamline the codebase and improve maintainability. * Performance Optimization: Improved memory management, reducing memory footprint and enhancing performance.	2 years ago