Dockerfile

# Multi-stage build for optimized image size
FROM python:3.9-slim as builder

# Set working directory
WORKDIR /app

# Install system dependencies
RUN apt-get update && apt-get install -y \
    gcc \
    g++ \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements first for better caching
COPY requirements.txt .

# Install Python dependencies
RUN pip install --no-cache-dir --user -r requirements.txt

# Production stage
FROM python:3.9-slim

# Set working directory
WORKDIR /app

# Create non-root user for security
RUN groupadd -r appuser && useradd -r -g appuser appuser

# Copy Python dependencies from builder stage
COPY --from=builder /root/.local /home/appuser/.local

# Copy application code
COPY src/ ./src/
COPY .env.example ./

# Set environment variables
ENV PYTHONPATH=/app
ENV PATH=/home/appuser/.local/bin:$PATH
ENV PYTHONUNBUFFERED=1

# Create directories for logs and data
RUN mkdir -p /app/logs /app/data && \
    chown -R appuser:appuser /app

# Switch to non-root user
USER appuser

# Expose port (configurable via environment variable)
EXPOSE 8050

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
    CMD python -c "import requests; requests.get('http://localhost:8050/_dash-dependencies', timeout=5)" || exit 1

# Default command
CMD ["python", "-m", "src.main", "--demo"]