# ═══════════════════════════════════════════════════════════
# 🐍 OPHION - Node.js Auto-Instrumentation Example
# Demonstrates automatic tracing for Node.js applications
# ═══════════════════════════════════════════════════════════
#
# Usage:
#   docker-compose up -d
#
# This example shows how to instrument ANY Node.js app without
# code changes using @opentelemetry/auto-instrumentations-node
# ═══════════════════════════════════════════════════════════

version: '3.8'

services:
  nodejs-app:
    build:
      context: .
      dockerfile: Dockerfile
    ports:
      - "3001:3000"
    environment:
      # ════════════════════════════════════════════════════
      # OpenTelemetry Auto-Instrumentation Configuration
      # ════════════════════════════════════════════════════
      
      # Service identification
      - OTEL_SERVICE_NAME=nodejs-example-app
      - OTEL_SERVICE_VERSION=1.0.0
      
      # OTLP Exporter configuration (pointing to Ophion collector)
      - OTEL_EXPORTER_OTLP_ENDPOINT=http://otel-collector:4318
      - OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf
      - OTEL_TRACES_EXPORTER=otlp
      - OTEL_METRICS_EXPORTER=otlp
      - OTEL_LOGS_EXPORTER=otlp
      
      # Resource attributes
      - OTEL_RESOURCE_ATTRIBUTES=deployment.environment=development,service.namespace=ophion-examples
      
      # Sampling (1.0 = 100% of traces)
      - OTEL_TRACES_SAMPLER=parentbased_traceidratio
      - OTEL_TRACES_SAMPLER_ARG=1.0
      
      # Propagation format
      - OTEL_PROPAGATORS=tracecontext,baggage,b3multi
      
      # Enable auto-instrumentation via Node.js loader
      - NODE_OPTIONS=--require @opentelemetry/auto-instrumentations-node/register
      
    networks:
      - ophion
    restart: unless-stopped
    healthcheck:
      test: ["CMD", "wget", "-q", "--spider", "http://localhost:3000/health"]
      interval: 10s
      timeout: 5s
      retries: 3

networks:
  ophion:
    external: true