Dockerfile.minimal

# ==============================================================================
# Traceway Minimal Docker Image
# Single binary serving both API and Frontend
# Designed for small instances with external ClickHouse
# Target image size: ~20-30MB
# ==============================================================================

# ==============================================================================
# Stage 1: Build Frontend
# ==============================================================================
FROM node:22-alpine AS frontend-builder

WORKDIR /app/frontend

# Copy package files first for better caching
COPY frontend/package.json frontend/package-lock.json ./

# Install dependencies
RUN npm ci

# Copy source and build
COPY frontend/ ./

ENV CLOUD_MODE=false
RUN npm run build

# ==============================================================================
# Stage 2: Build Backend with embedded frontend
# ==============================================================================
FROM golang:1.25-alpine AS backend-builder

WORKDIR /app/backend

# Install build dependencies
RUN apk add --no-cache git

# Copy all backend source
COPY backend/ ./

# Copy built frontend for embedding
COPY --from=frontend-builder /app/frontend/build ./static/frontend/

# Strip local replace directives and download dependencies
RUN go mod edit -dropreplace=go.tracewayapp.com -dropreplace=go.tracewayapp.com/tracewaygin
RUN go mod tidy
RUN go mod download

# Build with embedded static files
RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -tags "pgch" -ldflags="-s -w" -o /traceway ./cmd/traceway

# ==============================================================================
# Stage 3: Minimal runtime image
# ==============================================================================
FROM alpine:3.20

# Install minimal runtime dependencies
# - ca-certificates: for HTTPS connections to external ClickHouse
# - tzdata: for timezone support
RUN apk add --no-cache ca-certificates tzdata

# Copy the binary
COPY --from=backend-builder /traceway /usr/local/bin/traceway

# Create app directory
WORKDIR /app

# Environment variables (can be overridden at runtime)
ENV GIN_MODE=release

# Expose ports
# 80: Frontend + API
# 8082: Direct API access
EXPOSE 80 8082

# Health check using wget (alpine-native, no curl needed)
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
    CMD wget -qO- http://localhost/health || exit 1

# Run the binary directly (no systemd needed)
ENTRYPOINT ["/usr/local/bin/traceway"]