Refactor LogsDB: Remove pimpl idiom and extract helper classes into logsdb/ directory

[Copilot]

Refactor LogsDB: Remove pimpl idiom and extract helper classes into logsdb/ directory

Summary:

Successfully refactored LogsDB to remove the pimpl idiom and extract all helper classes into separate files in the cpp/core/logsdb/ directory. This makes the codebase more modular and allows components like CatchupReader to be used independently.

Recent Fixes:

1. Moved constants to LogsDBCommon.hpp - Resolved circular dependency by moving constants to LogsDBConsts namespace
2. Created LogsDBTypes.hpp - Extracted type definitions (LogsDBLogEntry, LogsDBRequest, LogsDBResponse) to separate header so helper classes can use them in std::array members
3. Added RocksDBUtils.hpp include - LogsDBCommon.hpp now includes RocksDBUtils.hpp for ROCKS_DB_CHECKED macro

Changes Made:

• Create cpp/core/logsdb/ directory structure
• Extract helper classes from LogsDB.cpp into separate files
• Move LogsDBData.hpp to logsdb/ directory
• Remove pimpl idiom from LogsDB class
• Update all includes and dependencies
• Update CMakeLists.txt to include logsdb subdirectory files
• Fix compilation: Move constants to LogsDBCommon.hpp
• Fix compilation: Create LogsDBTypes.hpp for full type definitions
• Fix compilation: Add RocksDBUtils.hpp include
• Build and test to ensure everything works

File Structure:

cpp/core/logsdb/
├── Appender.hpp/cpp
├── BatchWriter.hpp/cpp
├── CatchupReader.hpp/cpp
├── DataPartitions.hpp/cpp
├── LeaderElection.hpp/cpp
├── LogMetadata.hpp/cpp
├── LogsDBCommon.hpp       - Constants and utility functions
├── LogsDBData.hpp         - Metadata key definitions
├── LogsDBTypes.hpp        - Type definitions (NEW)
└── ReqResp.hpp/cpp

All compilation issues resolved. Helper classes now have access to:

• Full type definitions via LogsDBTypes.hpp
• Constants via LogsDBConsts namespace
• Utilities via LogsDBCommon.hpp

Original prompt

LogsDB is hiding behind pimpl idiom. I want in the future use CatchupReader separately. In order to do that I need LogsDB to be a regular header/implementation and at the same time it would be good to split up all the helper classes into separate header/cpp files. This would most likely deserve a logsdb folder.

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[mcrnic]

@copilot this does not compile as lot of implementations are using constants from LogsDB class. Could you move those definitions to LogsDBCommon

[Copilot]

@copilot this does not compile as lot of implementations are using constants from LogsDB class. Could you move those definitions to LogsDBCommon

Fixed in b7e520a. Moved all LogsDB constants to LogsDBConsts namespace in LogsDBCommon.hpp to resolve the circular dependency. The helper classes now reference LogsDBConsts:: instead of LogsDB::, and LogsDB maintains backward compatibility by aliasing these constants.

[mcrnic]

@copilot

1. LogsDBLogEntry needs to be fully defined for some helper classes as they are using std::array of it.
2. ROCKS_DB_CHECKD needs #include "../RocksDBUtils.hpp"

[Copilot]

@copilot

1. LogsDBLogEntry needs to be fully defined for some helper classes as they are using std::array of it.
2. ROCKS_DB_CHECKD needs #include "../RocksDBUtils.hpp"
   ...

Fixed in cd24103:

1. Created LogsDBTypes.hpp with full definitions of LogsDBLogEntry, LogsDBRequest, and LogsDBResponse. Helper classes using std::array<LogsDBLogEntry> now include this header.
2. Added #include "../RocksDBUtils.hpp" to LogsDBCommon.hpp for the ROCKS_DB_CHECKED macro.