Dockerfile

# Library Management System - Docker Image
# Multi-stage build for optimized image size

# Build stage
FROM python:3.11-slim as builder

WORKDIR /app

# Install build dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    gcc \
    && rm -rf /var/lib/apt/lists/*

# Create virtual environment
RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

# Install Python dependencies
COPY requirements.txt .
RUN pip install --no-cache-dir --upgrade pip && \
    pip install --no-cache-dir -r requirements.txt


# Production stage
FROM python:3.11-slim as production

WORKDIR /app

# Create non-root user for security
RUN useradd --create-home --shell /bin/bash appuser

# Copy virtual environment from builder
COPY --from=builder /opt/venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

# Copy application files
COPY --chown=appuser:appuser library.py main.py api.py config.py validators.py ./
COPY --chown=appuser:appuser index.html ./

# Create data directory and copy sample data if available
RUN mkdir -p /app/data && chown appuser:appuser /app/data
COPY --chown=appuser:appuser library.json /app/data/library.json

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    HOST=0.0.0.0 \
    PORT=8000 \
    LIBRARY_FILE=/app/data/library.json \
    LOG_LEVEL=INFO

# Switch to non-root user
USER appuser

# Expose the API port
EXPOSE 8000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD python -c "import httpx; httpx.get('http://localhost:8000/health').raise_for_status()"

# Run the application
CMD ["uvicorn", "api:app", "--host", "0.0.0.0", "--port", "8000"]