# syntax=docker/dockerfile:1
# Dockerfile.relay — multi-stage build for pgtrickle-relay binary
# Result: minimal distroless image (~30 MB) with the relay binary only.

# ─── Stage 1: Build ────────────────────────────────────────────────────────────
FROM rust:1.79-slim-bookworm AS builder

WORKDIR /build

# Install build-time system dependencies (openssl for reqwest, cmake for rdkafka)
RUN apt-get update && apt-get install -y --no-install-recommends \
    pkg-config \
    libssl-dev \
    cmake \
    make \
    g++ \
    && rm -rf /var/lib/apt/lists/*

# Cache Cargo registry and build dependencies before copying source.
COPY Cargo.toml Cargo.lock ./
COPY pgtrickle-relay/Cargo.toml ./pgtrickle-relay/Cargo.toml
COPY pgtrickle-tui/Cargo.toml ./pgtrickle-tui/Cargo.toml

# Create dummy workspace member sources so Cargo can resolve dependencies.
RUN mkdir -p src pgtrickle-relay/src pgtrickle-tui/src && \
    echo "fn main() {}" > src/main.rs && \
    echo "" > src/lib.rs && \
    echo "fn main() {}" > pgtrickle-relay/src/main.rs && \
    echo "fn main() {}" > pgtrickle-tui/src/main.rs

# Pre-fetch and compile dependencies (cached layer).
RUN cargo build -p pgtrickle-relay --release --features "nats,webhook,stdout" 2>/dev/null || true

# Now copy the real source and build for real.
COPY pgtrickle-relay/src ./pgtrickle-relay/src
RUN cargo build -p pgtrickle-relay --release --features "nats,webhook,stdout"

# ─── Stage 2: Runtime ──────────────────────────────────────────────────────────
FROM gcr.io/distroless/cc-debian12:nonroot

COPY --from=builder /build/target/release/pgtrickle-relay /usr/local/bin/pgtrickle-relay

EXPOSE 9090

ENTRYPOINT ["/usr/local/bin/pgtrickle-relay"]