name: simplex-chat-relay

services:
  relay:
    build:
      context: .
      args:
        CHAT_REF: ${CHAT_REF:-88df79d1e26921c7d1835fc8484fade596356fb6}
    image: chat-relay:latest                 # set your image/registry name
    container_name: chat-relay
    depends_on:
      db:
        condition: service_healthy
    environment:
      RELAY_NAME: ${RELAY_NAME}
      RELAY_WEB_DOMAIN: ${RELAY_WEB_DOMAIN}
      RELAY_ADDRESS_SERVER: ${RELAY_ADDRESS_SERVER:-}
      # Empty values fall back to the entrypoint defaults.
      RELAY_RTS_OPTS: ${RELAY_RTS_OPTS:-}
      RELAY_POOL_SIZE: ${RELAY_POOL_SIZE:-}
      RELAY_QUEUE_SIZE: ${RELAY_QUEUE_SIZE:-}
      # Password is passed as PGPASSWORD to keep it out of argv.
      DB_CONN: postgresql://${POSTGRES_USER}@db:5432/${POSTGRES_DB}
      PGPASSWORD: ${POSTGRES_PASSWORD}
    volumes:
      - /var/www/relay-web-channels:/var/www/relay-web-channels
      - ./out:/out
    restart: unless-stopped

  metrics:
    image: burningalchemist/sql_exporter:latest
    container_name: chat-relay-metrics
    depends_on:
      db:
        condition: service_healthy
    environment:
      # Percent-encode the password if it contains URL-reserved characters.
      SQLEXPORTER_TARGET_DSN: postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@db:5432/${POSTGRES_DB}?sslmode=disable
    volumes:
      - ./sql_exporter.yml:/etc/sql_exporter/sql_exporter.yml:ro
    command: ["-config.file=/etc/sql_exporter/sql_exporter.yml"]
    ports:
      - "127.0.0.1:9399:9399"
    restart: unless-stopped

  db:
    image: postgres:18
    container_name: chat-relay-db
    environment:
      POSTGRES_USER: ${POSTGRES_USER}
      POSTGRES_DB: ${POSTGRES_DB}
      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
    shm_size: 256mb                          # parallel workers need more than the 64 MB default
    volumes:
      # PG18+ keeps PGDATA in a version-specific subdirectory of this volume.
      - pgdata:/var/lib/postgresql
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U $$POSTGRES_USER -d $$POSTGRES_DB"]
      interval: 5s
      timeout: 5s
      retries: 10
    # Tuning for ~5 GB RAM / 4 cores. Match to the actual server.
    command:
      - postgres
      - --max_connections=100
      - --shared_buffers=1280MB
      - --effective_cache_size=3840MB
      - --maintenance_work_mem=320MB
      - --checkpoint_completion_target=0.9
      - --wal_buffers=16MB
      - --default_statistics_target=100
      - --random_page_cost=1.1
      - --effective_io_concurrency=200
      - --work_mem=6301kB
      - --huge_pages=off
      - --jit=off
      - --wal_compression=lz4
      - --min_wal_size=1GB
      - --max_wal_size=4GB
      - --max_worker_processes=4
      - --max_parallel_workers_per_gather=2
      - --max_parallel_workers=4
      - --max_parallel_maintenance_workers=2
    restart: unless-stopped

volumes:
  pgdata: