Dockerfile

FROM python:3.11-slim

WORKDIR /app

# substrate-interface requires py-sr25519-bindings which compiles Rust extensions.
# Install build toolchain first.
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    pkg-config \
    libssl-dev \
    curl \
    && curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y \
        --default-toolchain stable \
        --profile minimal \
    && apt-get clean \
    && rm -rf /var/lib/apt/lists/*

ENV PATH="/root/.cargo/bin:${PATH}"

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

# Copy application
COPY app.py .

# Expose port (Hugging Face Spaces uses 7860)
EXPOSE 7860

# Environment variables (set these in Hugging Face Spaces settings)
# REAL_API_URL should be set as a secret
ENV PORT=7860
ENV RATE_LIMIT_PER_MINUTE=20

# Run the app
CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860", "--proxy-headers", "--forwarded-allow-ips", "*"]