LCORE-1092: better docstrings

[tisnik]

Description

LCORE-1092: better docstrings

Type of change

• Refactor
• New feature
• Bug fix
• CVE fix
• Optimization
• Documentation Update
• Configuration Update
• Bump-up service version
• Bump-up dependent library
• Bump-up library or tool used for development (does not change the final image)
• CI configuration change
• Konflux configuration change
• Unit tests improvement
• Integration tests improvement
• End to end tests improvement

Tools used to create PR

Identify any AI code assistants used in this PR (for transparency and review context)

• Assisted-by: CodeRabbitAI
• Generated by: N/A

Related Tickets & Documents

• Related Issue #LCORE-1092

Summary by CodeRabbit

• Bug Fixes

  • Authorization now returns a valid default configuration instead of None.

• Improvements

  • Configuration reload clears runtime caches for consistent behavior.
  • Token usage history uses lazy initialization and caching for better performance.
  • Configuration generation now enforces block-style YAML and preserves/augments vector DB and provider entries (including BYOK RAG handling).

• Documentation

  • CLI and client/config docs expanded for clearer startup and configuration guidance.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

Configuration loading/docs expanded; reload now clears runtime caches (conversation cache, quota limiters, token usage history). Token usage history gains typed attributes and lazy initialization conditional on quota settings. authorization_configuration now returns a default no-op AuthorizationConfiguration when configured value is None. Docstrings expanded in client and CLI modules.

Changes

Cohort / File(s)	Summary
Configuration System src/configuration.py	Added comprehensive docstrings; on reload clear runtime caches (conversation cache, quota limiters, token usage history); lazy initialize and cache token usage history conditioned on quota settings; authorization_configuration returns a default no-op AuthorizationConfiguration when configured value is None; public accessors now raise LogicError if configuration not loaded.
Token Usage Tracking src/quota/token_usage_history.py	Added explicit type annotations for sqlite_connection_config, postgres_connection_config, and connection; imported SQLiteDatabaseConfiguration and PostgreSQLDatabaseConfiguration types; added Any typing import; updated constructor to use typed attributes.
Client & CLI docs src/client.py, src/lightspeed_stack.py	Expanded docstrings for AsyncLlamaStackClientHolder.load / get_client and for CLI functions (create_argument_parser, main) to document behavior, options, and error cases; no signature or runtime-behavior changes.
Configuration generation helpers src/llama_stack_configuration.py	Enforced block-style YAML indentation by altering increase_indent behavior; expanded docstrings for generate_configuration, construct_vector_dbs_section, and construct_vector_io_providers_section describing BYOK RAG insertion and returned structures.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Areas to focus review on:

• Authorization configuration defaulting to a no-op object — verify callers expecting None still behave correctly.
• Cache reset logic in configuration.py — ensure all runtime state is cleared and no stale references remain.
• TokenUsageHistory typing and lazy initialization — verify conditional initialization based on quota handler settings and DB config handling.

Suggested reviewers

• matysek

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'LCORE-1092: better docstrings' directly aligns with the main changeset, which adds extended docstrings across multiple configuration and client modules.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

---

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📥 Commits

Reviewing files that changed from the base of the PR and between 7e1d79b and 2201ca6.

📒 Files selected for processing (3)

• src/lightspeed_stack.py (2 hunks)
• src/llama_stack_configuration.py (3 hunks)
• src/quota/token_usage_history.py (3 hunks)

🚧 Files skipped from review as they are similar to previous changes (2)

• src/quota/token_usage_history.py
• src/lightspeed_stack.py

🧰 Additional context used

📓 Path-based instructions (1)

src/**/*.py

📄 CodeRabbit inference engine (CLAUDE.md)

src/**/*.py: Use absolute imports for internal modules in LCS project (e.g., from auth import get_auth_dependency)
All modules must start with descriptive docstrings explaining their purpose
Use logger = logging.getLogger(__name__) pattern for module logging
All functions must include complete type annotations for parameters and return types, using modern syntax (str | int) and Optional[Type] or Type | None
All functions must have docstrings with brief descriptions following Google Python docstring conventions
Function names must use snake_case with descriptive, action-oriented names (get_, validate_, check_)
Avoid in-place parameter modification anti-patterns; return new data structures instead of modifying input parameters
Use async def for I/O operations and external API calls
All classes must include descriptive docstrings explaining their purpose following Google Python docstring conventions
Class names must use PascalCase with descriptive names and standard suffixes: Configuration for config classes, Error/Exception for exceptions, Resolver for strategy patterns, Interface for abstract base classes
Abstract classes must use ABC with @abstractmethod decorators
Include complete type annotations for all class attributes in Python classes
Use import logging and module logger pattern with standard log levels: debug, info, warning, error

Files:

• src/llama_stack_configuration.py

🧬 Code graph analysis (1)

src/llama_stack_configuration.py (1)

src/models/config.py (1)

• Configuration (1385-1499)

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• GitHub Check: Konflux kflux-prd-rh02 / lightspeed-stack-on-pull-request
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• GitHub Check: E2E: server mode / vertexai
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🔇 Additional comments (4)

src/llama_stack_configuration.py (4)

19-31: Excellent docstring for indentation control.

The expanded docstring clearly explains the purpose of forcing block-style indentation and documents both parameters appropriately. The implementation correctly ignores the indentless parameter as documented.

As per coding guidelines, all functions must have docstrings following Google Python docstring conventions—this change satisfies that requirement.

---

37-54: Comprehensive docstring for configuration generation.

The expanded docstring provides a clear overview of the BYOK RAG insertion behavior, including the conditional logic when config.byok_rag is empty versus non-empty. All parameters are thoroughly documented.

As per coding guidelines, this follows Google Python docstring conventions and provides the required descriptive documentation.

---

82-99: Well-documented vector_dbs section construction.

The expanded docstring clearly explains the function's purpose and provides detailed documentation of the returned structure, including all dictionary keys (vector_db_id, provider_id, embedding_model, embedding_dimension). The preservation of existing entries is also documented.

As per coding guidelines, this follows Google Python docstring conventions with complete parameter and return value documentation.

---

127-147: Thorough documentation of vector_io providers construction.

The expanded docstring provides excellent detail about the returned structure, including the nested config with kvstore details (db_path, namespace, type). The documentation accurately reflects the implementation and makes the complex structure clear to readers.

As per coding guidelines, this follows Google Python docstring conventions and provides comprehensive documentation of parameters and return values.

---

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[coderabbitai]

Actionable comments posted: 2

📜 Review details

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 23dc4d1 and d60a90f.

📒 Files selected for processing (2)

• src/configuration.py (3 hunks)
• src/quota/token_usage_history.py (4 hunks)

🧰 Additional context used

📓 Path-based instructions (1)

src/**/*.py

📄 CodeRabbit inference engine (CLAUDE.md)

src/**/*.py: Use absolute imports for internal modules in LCS project (e.g., from auth import get_auth_dependency)
All modules must start with descriptive docstrings explaining their purpose
Use logger = logging.getLogger(__name__) pattern for module logging
All functions must include complete type annotations for parameters and return types, using modern syntax (str | int) and Optional[Type] or Type | None
All functions must have docstrings with brief descriptions following Google Python docstring conventions
Function names must use snake_case with descriptive, action-oriented names (get_, validate_, check_)
Avoid in-place parameter modification anti-patterns; return new data structures instead of modifying input parameters
Use async def for I/O operations and external API calls
All classes must include descriptive docstrings explaining their purpose following Google Python docstring conventions
Class names must use PascalCase with descriptive names and standard suffixes: Configuration for config classes, Error/Exception for exceptions, Resolver for strategy patterns, Interface for abstract base classes
Abstract classes must use ABC with @abstractmethod decorators
Include complete type annotations for all class attributes in Python classes
Use import logging and module logger pattern with standard log levels: debug, info, warning, error

Files:

• src/configuration.py
• src/quota/token_usage_history.py

🧬 Code graph analysis (2)

src/configuration.py (4)

src/models/config.py (11)

• Configuration (1385-1499)
• ServiceConfiguration (344-421)
• LlamaStackConfiguration (459-550)
• UserDataCollection (553-618)
• ModelContextProtocolServer (424-456)
• AuthenticationConfiguration (927-1036)
• AuthorizationConfiguration (827-834)
• InferenceConfiguration (1109-1143)
• ConversationHistoryConfiguration (1146-1217)
• DatabaseConfiguration (263-341)
• QuotaHandlersConfiguration (1343-1382)

src/cache/cache.py (1)

• Cache (10-129)

src/quota/quota_limiter.py (1)

• QuotaLimiter (49-123)

src/quota/token_usage_history.py (1)

• TokenUsageHistory (34-201)

src/quota/token_usage_history.py (1)

src/models/config.py (3)

• QuotaHandlersConfiguration (1343-1382)
• SQLiteDatabaseConfiguration (156-163)
• PostgreSQLDatabaseConfiguration (176-260)

🪛 GitHub Actions: Python linter

src/quota/token_usage_history.py

[error] 12-12: pylint C0411: standard import "typing.Any" should be placed before third party import "psycopg2" (wrong-import-order). The lint step 'uv run pylint src tests' failed with exit code 16.

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (8)

• GitHub Check: Konflux kflux-prd-rh02 / lightspeed-stack-on-pull-request
• GitHub Check: build-pr
• GitHub Check: E2E: library mode / azure
• GitHub Check: E2E: library mode / vertexai
• GitHub Check: E2E: library mode / ci
• GitHub Check: E2E: server mode / vertexai
• GitHub Check: E2E: server mode / ci
• GitHub Check: E2E: server mode / azure

🔇 Additional comments (4)

src/quota/token_usage_history.py (1)

53-59: LGTM! Type annotations enhance code clarity.

The explicit type annotations for connection configuration attributes follow modern Python syntax and align with the coding guidelines. This improves type safety and makes the dual-backend support (PostgreSQL/SQLite) more explicit.

src/configuration.py (3)

52-268: Excellent docstring enhancements throughout.

The expanded docstrings consistently follow Google Python style conventions, clearly document parameters, return types, and raised exceptions. This significantly improves code maintainability and aligns perfectly with the coding guidelines requiring complete docstrings for all functions.

---

86-89: LGTM! Proper cache invalidation on configuration reload.

Clearing _token_usage_history when configuration changes ensures that the token usage history will be reinitialized with the new configuration on next access. This is consistent with how _conversation_cache and _quota_limiters are cleared and supports the lazy initialization pattern.

---

195-196: No breaking changes detected with this behavioral modification.

Verification found no code in the codebase that checks for None on authorization_configuration. Tests explicitly assert the property returns non-None, and the middleware directly accesses its access_rules attribute without null guards. This change is safe and improves the API design by providing predictable default behavior.

[coderabbitai]

⚠️ Potential issue | 🔴 Critical

Fix import order to resolve pipeline failure.

The pipeline linter reports that standard library imports (like typing) must come before third-party imports (like psycopg2). Move the from typing import Any import to line 8, immediately after the import sqlite3 line.

🔎 Proposed fix

 import sqlite3
+from typing import Any
 from datetime import datetime
 import psycopg2
 
-from typing import Any
-
 from log import get_logger

🧰 Tools

🪛 GitHub Actions: Python linter

[error] 12-12: pylint C0411: standard import "typing.Any" should be placed before third party import "psycopg2" (wrong-import-order). The lint step 'uv run pylint src tests' failed with exit code 16.

🤖 Prompt for AI Agents

In src/quota/token_usage_history.py around line 12, the import "from typing
import Any" (a standard library typing import) is placed after third-party
imports causing the linter failure; move that import to line 8 immediately after
"import sqlite3" so all standard library imports precede third-party imports
(ensure import ordering is updated accordingly).

[coderabbitai]

Actionable comments posted: 2

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

src/lightspeed_stack.py (1)

1-155: Run Black formatter to fix formatting issues.

After addressing the line length violations, run Black to ensure consistent formatting across the file.

#!/bin/bash
# Run Black formatter to fix all formatting issues
uv tool run black --write src/lightspeed_stack.py

♻️ Duplicate comments (2)

src/quota/token_usage_history.py (2)

10-11: Fix import order to resolve linter failure.

The typing import must be placed before third-party imports like psycopg2 (line 12) per PEP 8. This issue was previously flagged and remains unresolved.

🔎 Proposed fix

 import sqlite3
+from typing import Any
 from datetime import datetime
+
 import psycopg2
 
-from typing import Any
-
 from log import get_logger

---

119-119: Fix typo in log message: "mode" should be "model".

The log message uses "mode" but the parameter is named model (line 100). This inconsistency was previously flagged and remains unresolved.

🔎 Proposed fix

-            "Token usage for user %s, provider %s and mode %s changed by %d, %d tokens",
+            "Token usage for user %s, provider %s and model %s changed by %d, %d tokens",

🧹 Nitpick comments (1)

src/client.py (1)

24-45: Excellent docstring improvement!

The expanded docstring comprehensively documents the load method's behavior, clearly distinguishing between library-mode and service-mode initialization. It properly documents parameters, return behavior, and exception cases following Google Python docstring conventions.

---

Optional: Address the TODO comment for custom exception.

Note: Line 57 contains a TODO comment suggesting the use of a custom exception instead of ValueError. While not blocking, a custom exception would improve error handling specificity.

Would you like me to help create a custom exception class (e.g., ClientConfigurationError) for this use case?

📜 Review details

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between d60a90f and 7e1d79b.

📒 Files selected for processing (3)

• src/client.py (2 hunks)
• src/lightspeed_stack.py (2 hunks)
• src/quota/token_usage_history.py (4 hunks)

🧰 Additional context used

📓 Path-based instructions (2)

src/**/*.py

📄 CodeRabbit inference engine (CLAUDE.md)

src/**/*.py: Use absolute imports for internal modules in LCS project (e.g., from auth import get_auth_dependency)
All modules must start with descriptive docstrings explaining their purpose
Use logger = logging.getLogger(__name__) pattern for module logging
All functions must include complete type annotations for parameters and return types, using modern syntax (str | int) and Optional[Type] or Type | None
All functions must have docstrings with brief descriptions following Google Python docstring conventions
Function names must use snake_case with descriptive, action-oriented names (get_, validate_, check_)
Avoid in-place parameter modification anti-patterns; return new data structures instead of modifying input parameters
Use async def for I/O operations and external API calls
All classes must include descriptive docstrings explaining their purpose following Google Python docstring conventions
Class names must use PascalCase with descriptive names and standard suffixes: Configuration for config classes, Error/Exception for exceptions, Resolver for strategy patterns, Interface for abstract base classes
Abstract classes must use ABC with @abstractmethod decorators
Include complete type annotations for all class attributes in Python classes
Use import logging and module logger pattern with standard log levels: debug, info, warning, error

Files:

• src/quota/token_usage_history.py
• src/lightspeed_stack.py
• src/client.py

src/**/{client,app/endpoints/**}.py

📄 CodeRabbit inference engine (CLAUDE.md)

Handle APIConnectionError from Llama Stack in integration code

Files:

• src/client.py

🧬 Code graph analysis (1)

src/quota/token_usage_history.py (3)

src/models/config.py (3)

• QuotaHandlersConfiguration (1343-1382)
• SQLiteDatabaseConfiguration (156-163)
• PostgreSQLDatabaseConfiguration (176-260)

src/configuration.py (1)

• configuration (94-105)

src/utils/connection_decorator.py (1)

• connection (6-48)

🪛 GitHub Actions: Black

src/lightspeed_stack.py

[error] 1-1: Black formatting would reformat this file. Run 'uv tool run black --write src/lightspeed_stack.py' to format.

🪛 GitHub Actions: Python linter

src/lightspeed_stack.py

[error] 34-34: Pylint: Line too long (116/100) (C0301)

---

[error] 97-97: Pylint: Line too long (140/100) (C0301)

---

[error] 98-98: Pylint: Line too long (182/100) (C0301)

---

[error] 99-99: Pylint: Line too long (136/100) (C0301)

---

[error] 102-102: Pylint: Line too long (101/100) (C0301)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (8)

• GitHub Check: build-pr
• GitHub Check: Konflux kflux-prd-rh02 / lightspeed-stack-on-pull-request
• GitHub Check: E2E: server mode / ci
• GitHub Check: E2E: library mode / vertexai
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• GitHub Check: E2E: library mode / ci

🔇 Additional comments (4)

src/client.py (1)

71-79: Well-documented getter method.

The expanded docstring clearly documents the get_client method's return value and error conditions. The documentation correctly reflects that callers must invoke load() before attempting to retrieve the client.

src/lightspeed_stack.py (1)

28-40: Excellent documentation improvements!

The enhanced docstrings significantly improve code clarity by thoroughly documenting CLI options and the startup workflow. This aligns perfectly with the PR objective and follows Google Python docstring conventions as required by the coding guidelines. Once the formatting issues are resolved, these changes will be a valuable contribution to code maintainability.

Also applies to: 92-103

src/quota/token_usage_history.py (2)

24-28: LGTM! Configuration type imports improve type safety.

The imports enable explicit type annotations for instance attributes, improving code clarity and supporting the documentation improvements in this PR.

---

53-59: LGTM! Explicit type annotations follow coding guidelines.

The type annotations use modern syntax and provide clear type information for all instance attributes, aligning with the project's coding guidelines and improving code documentation.