Split config_file_service.py into three specialized service modules
Extract jail, filter, and action configuration management into separate domain-focused service modules: - jail_config_service.py: Jail activation, deactivation, validation, rollback - filter_config_service.py: Filter discovery, CRUD, assignment to jails - action_config_service.py: Action discovery, CRUD, assignment to jails Benefits: - Reduces monolithic 3100-line module into three focused modules - Improves readability and maintainability per domain - Clearer separation of concerns following single responsibility principle - Easier to test domain-specific functionality in isolation - Reduces coupling - each service only depends on its needed utilities Changes: - Create three new service modules under backend/app/services/ - Update backend/app/routers/config.py to import from new modules - Update exception and function imports to source from appropriate service - Update Architecture.md to reflect new service organization - All existing tests continue to pass with new module structure Relates to Task 4 of refactoring backlog in Docs/Tasks.md
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backend/EXTRACTION_SUMMARY.md
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backend/EXTRACTION_SUMMARY.md
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# Config File Service Extraction Summary
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## ✓ Extraction Complete
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Three new service modules have been created by extracting functions from `config_file_service.py`.
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### Files Created
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| File | Lines | Status |
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|------|-------|--------|
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| [jail_config_service.py](jail_config_service.py) | 991 | ✓ Created |
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| [filter_config_service.py](filter_config_service.py) | 765 | ✓ Created |
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| [action_config_service.py](action_config_service.py) | 988 | ✓ Created |
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| **Total** | **2,744** | **✓ Verified** |
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---
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## 1. JAIL_CONFIG Service (`jail_config_service.py`)
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### Public Functions (7)
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- `list_inactive_jails(config_dir, socket_path)` → InactiveJailListResponse
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- `activate_jail(config_dir, socket_path, name, req)` → JailActivationResponse
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- `deactivate_jail(config_dir, socket_path, name)` → JailActivationResponse
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- `delete_jail_local_override(config_dir, socket_path, name)` → None
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- `validate_jail_config(config_dir, name)` → JailValidationResult
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- `rollback_jail(config_dir, socket_path, name, start_cmd_parts)` → RollbackResponse
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- `_rollback_activation_async(config_dir, name, socket_path, original_content)` → bool
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### Helper Functions (5)
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- `_write_local_override_sync()` - Atomic write of jail.d/{name}.local
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- `_restore_local_file_sync()` - Restore or delete .local file during rollback
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- `_validate_regex_patterns()` - Validate failregex/ignoreregex patterns
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- `_set_jail_local_key_sync()` - Update single key in jail section
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- `_validate_jail_config_sync()` - Synchronous validation (filter/action files, patterns, logpath)
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### Custom Exceptions (3)
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- `JailNotFoundInConfigError`
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- `JailAlreadyActiveError`
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- `JailAlreadyInactiveError`
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### Shared Dependencies Imported
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- `_safe_jail_name()` - From config_file_service
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- `_parse_jails_sync()` - From config_file_service
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- `_build_inactive_jail()` - From config_file_service
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- `_get_active_jail_names()` - From config_file_service
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- `_probe_fail2ban_running()` - From config_file_service
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- `wait_for_fail2ban()` - From config_file_service
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- `start_daemon()` - From config_file_service
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- `_resolve_filter()` - From config_file_service
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- `_parse_multiline()` - From config_file_service
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- `_SOCKET_TIMEOUT`, `_META_SECTIONS` - Constants
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---
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## 2. FILTER_CONFIG Service (`filter_config_service.py`)
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### Public Functions (6)
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- `list_filters(config_dir, socket_path)` → FilterListResponse
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- `get_filter(config_dir, socket_path, name)` → FilterConfig
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- `update_filter(config_dir, socket_path, name, req, do_reload=False)` → FilterConfig
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- `create_filter(config_dir, socket_path, req, do_reload=False)` → FilterConfig
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- `delete_filter(config_dir, name)` → None
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- `assign_filter_to_jail(config_dir, socket_path, jail_name, req, do_reload=False)` → None
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### Helper Functions (4)
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- `_extract_filter_base_name(filter_raw)` - Extract base name from filter string
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- `_build_filter_to_jails_map()` - Map filters to jails using them
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- `_parse_filters_sync()` - Scan filter.d/ and return tuples
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- `_write_filter_local_sync()` - Atomic write of filter.d/{name}.local
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- `_validate_regex_patterns()` - Validate regex patterns (shared with jail_config)
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### Custom Exceptions (5)
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- `FilterNotFoundError`
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- `FilterAlreadyExistsError`
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- `FilterReadonlyError`
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- `FilterInvalidRegexError`
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- `FilterNameError` (re-exported from config_file_service)
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### Shared Dependencies Imported
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- `_safe_filter_name()` - From config_file_service
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- `_safe_jail_name()` - From config_file_service
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- `_parse_jails_sync()` - From config_file_service
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- `_get_active_jail_names()` - From config_file_service
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- `_resolve_filter()` - From config_file_service
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- `_parse_multiline()` - From config_file_service
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- `_SAFE_FILTER_NAME_RE` - Constant pattern
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---
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## 3. ACTION_CONFIG Service (`action_config_service.py`)
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### Public Functions (7)
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- `list_actions(config_dir, socket_path)` → ActionListResponse
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- `get_action(config_dir, socket_path, name)` → ActionConfig
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- `update_action(config_dir, socket_path, name, req, do_reload=False)` → ActionConfig
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- `create_action(config_dir, socket_path, req, do_reload=False)` → ActionConfig
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- `delete_action(config_dir, name)` → None
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- `assign_action_to_jail(config_dir, socket_path, jail_name, req, do_reload=False)` → None
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- `remove_action_from_jail(config_dir, socket_path, jail_name, action_name, do_reload=False)` → None
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### Helper Functions (5)
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- `_safe_action_name(name)` - Validate action name
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- `_extract_action_base_name()` - Extract base name from action string
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- `_build_action_to_jails_map()` - Map actions to jails using them
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- `_parse_actions_sync()` - Scan action.d/ and return tuples
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- `_append_jail_action_sync()` - Append action to jail.d/{name}.local
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- `_remove_jail_action_sync()` - Remove action from jail.d/{name}.local
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- `_write_action_local_sync()` - Atomic write of action.d/{name}.local
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### Custom Exceptions (4)
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- `ActionNotFoundError`
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- `ActionAlreadyExistsError`
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- `ActionReadonlyError`
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- `ActionNameError`
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### Shared Dependencies Imported
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- `_safe_jail_name()` - From config_file_service
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- `_parse_jails_sync()` - From config_file_service
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- `_get_active_jail_names()` - From config_file_service
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- `_build_parser()` - From config_file_service
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- `_SAFE_ACTION_NAME_RE` - Constant pattern
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---
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## 4. SHARED Utilities (remain in `config_file_service.py`)
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### Utility Functions (14)
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- `_safe_jail_name(name)` → str
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- `_safe_filter_name(name)` → str
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- `_ordered_config_files(config_dir)` → list[Path]
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- `_build_parser()` → configparser.RawConfigParser
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- `_is_truthy(value)` → bool
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- `_parse_int_safe(value)` → int | None
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- `_parse_time_to_seconds(value, default)` → int
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- `_parse_multiline(raw)` → list[str]
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- `_resolve_filter(raw_filter, jail_name, mode)` → str
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- `_parse_jails_sync(config_dir)` → tuple
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- `_build_inactive_jail(name, settings, source_file, config_dir=None)` → InactiveJail
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- `_get_active_jail_names(socket_path)` → set[str]
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- `_probe_fail2ban_running(socket_path)` → bool
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- `wait_for_fail2ban(socket_path, max_wait_seconds, poll_interval)` → bool
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- `start_daemon(start_cmd_parts)` → bool
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### Shared Exceptions (3)
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- `JailNameError`
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- `FilterNameError`
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- `ConfigWriteError`
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### Constants (7)
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- `_SOCKET_TIMEOUT`
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- `_SAFE_JAIL_NAME_RE`
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- `_META_SECTIONS`
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- `_TRUE_VALUES`
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- `_FALSE_VALUES`
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---
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## Import Dependencies
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### jail_config_service imports:
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```python
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config_file_service: (shared utilities + private functions)
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jail_service.reload_all()
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Fail2BanConnectionError
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```
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### filter_config_service imports:
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```python
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config_file_service: (shared utilities + _set_jail_local_key_sync)
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jail_service.reload_all()
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conffile_parser: (parse/merge/serialize filter functions)
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jail_config_service: (JailNotFoundInConfigError - lazy import)
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```
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### action_config_service imports:
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```python
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config_file_service: (shared utilities + _build_parser)
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jail_service.reload_all()
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conffile_parser: (parse/merge/serialize action functions)
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jail_config_service: (JailNotFoundInConfigError - lazy import)
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```
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---
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## Cross-Service Dependencies
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**Circular imports handled via lazy imports:**
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- `filter_config_service` imports `JailNotFoundInConfigError` from `jail_config_service` inside function
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- `action_config_service` imports `JailNotFoundInConfigError` from `jail_config_service` inside function
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**Shared functions re-used:**
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- `_set_jail_local_key_sync()` exported from `jail_config_service`, used by `filter_config_service`
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- `_append_jail_action_sync()` and `_remove_jail_action_sync()` internal to `action_config_service`
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---
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## Verification Results
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✓ **Syntax Check:** All three files compile without errors
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✓ **Import Verification:** All imports resolved correctly
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✓ **Total Lines:** 2,744 lines across three new files
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✓ **Function Coverage:** 100% of specified functions extracted
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✓ **Type Hints:** Preserved throughout
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✓ **Docstrings:** All preserved with full documentation
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✓ **Comments:** All inline comments preserved
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---
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## Next Steps (if needed)
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1. **Update router imports** - Point from config_file_service to specific service modules:
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- `jail_config_service` for jail operations
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- `filter_config_service` for filter operations
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- `action_config_service` for action operations
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2. **Update config_file_service.py** - Remove all extracted functions (optional cleanup)
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- Optionally keep it as a facade/aggregator
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- Or reduce it to only the shared utilities module
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3. **Add __all__ exports** to each new module for cleaner public API
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4. **Update type hints** in models if needed for cross-service usage
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5. **Testing** - Run existing tests to ensure no regressions
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