Dockerfile.worker

# Multi-stage Dockerfile for Temporal Worker Service
# Optimized for production deployment in Kubernetes

# Stage 1: Base image with dependencies
FROM node:24.12.0-alpine AS base
LABEL maintainer="Darshit Vora"
LABEL description="Temporal Worker Service for workflow execution"

# Install dumb-init for proper signal handling
RUN apk add --no-cache dumb-init

# Set working directory
WORKDIR /usr/src/app

# Copy package files
COPY package*.json ./

# Stage 2: Development dependencies
FROM base AS development
ENV NODE_ENV=development

# Install all dependencies (including devDependencies)
RUN npm ci --include=dev

# Copy source code
COPY . .

# Use dumb-init to handle signals properly
CMD ["dumb-init", "npm", "run", "start:worker:all"]

# Stage 3: Production dependencies
FROM base AS production-deps
ENV NODE_ENV=production

# Install only production dependencies
RUN npm ci --omit=dev && npm cache clean --force

# Stage 4: Production build
FROM base AS production
ENV NODE_ENV=production

# Copy production dependencies from production-deps stage
COPY --from=production-deps /usr/src/app/node_modules ./node_modules

# Copy application source (workers need access to activities and workflows)
COPY . .

# Create non-root user for security
RUN addgroup -g 1001 -S nodejs && \
    adduser -S nodejs -u 1001 && \
    chown -R nodejs:nodejs /usr/src/app

# Create logs directory with proper permissions
RUN mkdir -p logs && chown -R nodejs:nodejs logs

# Switch to non-root user
USER nodejs

# Workers don't expose HTTP ports - they connect to Temporal Server via gRPC

# No health check needed - Temporal Server monitors worker health via heartbeat

# Use dumb-init to handle signals properly (important for graceful worker shutdown)
# Workers need clean shutdown to complete in-flight activities
CMD ["dumb-init", "node", "./src/temporal/workers/user.worker.js"]