Python Best Practices Setup - Complete

Successfully set up apps/server with Python best practices, modern tooling, comprehensive testing, and production-ready configurations.

Summary of Changes

✅ Core Configuration

[pyproject.toml](file:///Users/sunny/workspace/projects/kemma/apps/server/pyproject.toml)

• Added development dependencies: ruff, pyright, pytest, pytest-asyncio, pytest-cov, httpx, pre-commit
• Configured Ruff for linting and formatting (replaces Black + isort + Flake8)
  • Line length: 100 characters
  • Enabled comprehensive rule sets: pycodestyle, pyflakes, isort, pep8-naming, pyupgrade, type annotations, security, bugbear, and more
  • Auto-fix enabled for safe corrections
• Configured pyright for type checking
  • Python 3.13 target
  • Basic mode for practical type checking
  • Excludes cache and virtual environment directories
• Configured pytest with async support
  • Auto async mode
  • Coverage reporting (term, HTML, XML)
  • Test discovery patterns
• Fixed hatchling build configuration to properly package kemma module

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✅ Code Quality Tools

[.pre-commit-config.yaml](file:///Users/sunny/workspace/projects/kemma/apps/server/.pre-commit-config.yaml)

Pre-commit hooks for automated code quality checks:

• Trailing whitespace removal
• End-of-file fixer
• YAML/JSON validation
• Large file detection
• Merge conflict detection
• Private key detection
• Ruff linting with auto-fix
• Ruff formatting

✅ Installed: Pre-commit hooks are now active in the git repository

[Makefile](file:///Users/sunny/workspace/projects/kemma/apps/server/Makefile)

Developer-friendly commands:

• make help - Show all available commands
• make install - Install dependencies
• make format - Format code with Ruff
• make lint - Lint code with Ruff
• make type-check - Run pyright type checker
• make test - Run tests
• make test-cov - Run tests with coverage
• make dev - Start development server
• make clean - Clean cache files
• make all-checks - Run all quality checks

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✅ Production Configuration

[kemma/core/logging.py](file:///Users/sunny/workspace/projects/kemma/apps/server/kemma/core/logging.py) [NEW]

Production-ready logging:

• Environment-based configuration
• Configurable log levels
• Structured logging support
• Library log level management (suppresses noisy libraries)

[kemma/config.py](file:///Users/sunny/workspace/projects/kemma/apps/server/kemma/config.py)

Enhanced with:

• debug - Debug mode flag
• environment - Environment detection (development/staging/production)
• health_check_enabled - Health check toggle

[kemma/main.py](file:///Users/sunny/workspace/projects/kemma/apps/server/kemma/main.py)

Enhanced with:

• Improved logging setup using core.logging
• New /health endpoint with comprehensive health checks:
  • System status
  • Version information
  • Environment details
  • Database connectivity check
  • Available LLM providers
• Shutdown event handler

[.env.production.example](file:///Users/sunny/workspace/projects/kemma/apps/server/.env.production.example) [NEW]

Production environment template with:

• PostgreSQL database configuration
• Production CORS settings
• Disabled debug mode
• INFO log level
• Health check enabled

[.gitignore](file:///Users/sunny/workspace/projects/kemma/apps/server/.gitignore) [NEW]

Comprehensive ignore patterns for Python projects

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✅ Testing Infrastructure

[tests/conftest.py](file:///Users/sunny/workspace/projects/kemma/apps/server/tests/conftest.py)

Pytest fixtures:

• test_engine - In-memory SQLite database engine
• test_session - Async database session
• seed_test_data - Populates test database with sample nodes
• test_client - Async HTTP client with dependency injection

[tests/test_health.py](file:///Users/sunny/workspace/projects/kemma/apps/server/tests/test_health.py) [NEW]

Tests for health check endpoints:

• Root endpoint (/) returns API information
• Health check endpoint (/health) returns system status and database connectivity

[tests/test_spark_api.py](file:///Users/sunny/workspace/projects/kemma/apps/server/tests/test_spark_api.py)

Refactored to use async/await pattern:

• All tests updated to use test_client fixture
• Tests for mock provider
• Contextual suggestions validation
• Request parameter validation
• Error handling

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✅ Code Quality Improvements

All code now passes strict linting and type checking:

Fixed Type Annotations

• Added return types to all route handlers
• Added AsyncGenerator types for database sessions and context managers
• Added None return types to __init__ methods
• Replaced Any types with proper SQLAlchemy types in test fixtures

Fixed Exception Handling

• Updated exception handling to use from None pattern in [spark.py](file:///Users/sunny/workspace/projects/kemma/apps/server/kemma/api/routes/spark.py)
• Properly distinguishes between different exception types (404, 400, 500)

Fixed Line Lengths

• Broke long lines in [prompts.py](file:///Users/sunny/workspace/projects/kemma/apps/server/kemma/services/llm/prompts.py) to meet 100 character limit

Formatting

• 18 files reformatted using Ruff
• Consistent code style across entire codebase

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✅ Documentation

[README.md](file:///Users/sunny/workspace/projects/kemma/apps/server/README.md)

Added comprehensive sections:

Development Setup (new):

• Installing development dependencies
• Code quality tools overview
• Running formatters, linters, type checkers
• Pre-commit hooks setup
• Testing with coverage
• Makefile commands reference

Production Deployment (new):

• Environment configuration
• Running with uvicorn (single/multi-worker)
• Health check endpoint usage
• Logging configuration
• Security best practices
• Monitoring recommendations

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Verification Results

✅ All Tests Passing (7/7)

tests/test_health.py::test_root_endpoint PASSED
tests/test_health.py::test_health_check_endpoint PASSED
tests/test_spark_api.py::test_spark_with_mock_provider PASSED
tests/test_spark_api.py::test_spark_returns_contextual_suggestions PASSED
tests/test_spark_api.py::test_spark_respects_num_suggestions PASSED
tests/test_spark_api.py::test_spark_invalid_provider PASSED
tests/test_spark_api.py::test_get_all_nodes PASSED

✅ Code Coverage: 71%

Current coverage breakdown:

• 100%: API schemas, config, logging, database, models, base services, prompts
• 83%: Nodes API routes
• 78%: Database module
• 74%: LLM factory
• 61%: Spark API routes
• 56%: Individual LLM providers (OpenAI, Gemini, Grok)
• 43%: Mock provider

Lower coverage on LLM providers is acceptable as they require API credentials for full testing.

✅ Linting: All Clear

uv run ruff check . --fix
# Result: Found 4 errors (4 fixed, 0 remaining)

All linting issues automatically fixed.

✅ Formatting: Complete

uv run ruff format .
# Result: 18 files reformatted, 12 files left unchanged

✅ Pre-commit Hooks: Installed

Git hooks are now active and will run on every commit.

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Quick Start Guide

For Developers

# Install dependencies
cd apps/server
uv sync

# Install pre-commit hooks
uv run pre-commit install

# Format code
make format

# Lint code
make lint

# Type check
make type-check

# Run tests
make test-cov

# Start dev server
make dev

For Production

# Set up production environment
cp .env.production.example .env
# Edit .env with production values

# Run with multiple workers
uv run uvicorn kemma.main:app \
  --host 0.0.0.0 \
  --port 8000 \
  --workers 4

# Health check
curl http://localhost:8000/health

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What's Production-Ready

✅ Logging: Environment-based configuration, structured logging support ✅ Health Checks: Comprehensive /health endpoint for monitoring ✅ Type Safety: Pyright type checking throughout codebase ✅ Code Quality: Automated linting and formatting via pre-commit hooks ✅ Testing: 71% coverage with async test infrastructure ✅ Documentation: Complete setup, development, and deployment guides ✅ Security: .gitignore prevents committing secrets, CORS configuration ✅ Scalability: Multi-worker uvicorn configuration documented

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Tools Overview

Tool	Purpose	Command
Ruff	Fast linter + formatter	uv run ruff check . --fix
pyright	Static type checker	uv run pyright kemma/
pytest	Test runner	uv run pytest --cov=kemma
pre-commit	Git hooks	uv run pre-commit run --all-files
uv	Package manager	uv sync

All configured in [pyproject.toml](file:///Users/sunny/workspace/projects/kemma/apps/server/pyproject.toml).