docker-compose.yml

services:
  helios-light-client:
    build:
      context: .
    image: helios-light-client:latest
    environment:
      # Required envs (must be provided)
      - CHAIN_ID
      - PRIMARY
      - WITNESSES
      - TRUSTED_HEIGHT
      - TRUSTED_HASH
      # Optional envs
      - LISTEN_ADDR
      - TRUST_THRESHOLD
      - TRUSTING_PERIOD
      - MAX_CLOCK_DRIFT
      - MAX_BLOCK_LAG
      - FRESHNESS_THRESHOLD
      - KEEP_WARM_INTERVAL
      - HALT_DURATION_ON_FORK
      - API_TIMEOUT
      - VERBOSE
    command: |
      sh -c '
        set -e
        : "${CHAIN_ID?missing CHAIN_ID}"
        : "${PRIMARY?missing PRIMARY}"
        : "${WITNESSES?missing WITNESSES}"
        : "${TRUSTED_HEIGHT?missing TRUSTED_HEIGHT}"
        : "${TRUSTED_HASH?missing TRUSTED_HASH}"

        set -- \
          --chain-id "$$CHAIN_ID" \
          --primary "$$PRIMARY" \
          --witnesses "$$WITNESSES" \
          --trusted-height "$$TRUSTED_HEIGHT" \
          --trusted-hash "$$TRUSTED_HASH"

        [ -n "$$LISTEN_ADDR" ] && set -- "$$@" --listen-addr "$$LISTEN_ADDR"
        [ -n "$$TRUST_THRESHOLD" ] && set -- "$$@" --trust-threshold "$$TRUST_THRESHOLD"
        [ -n "$$TRUSTING_PERIOD" ] && set -- "$$@" --trusting-period "$$TRUSTING_PERIOD"
        [ -n "$$MAX_CLOCK_DRIFT" ] && set -- "$$@" --max-clock-drift "$$MAX_CLOCK_DRIFT"
        [ -n "$$MAX_BLOCK_LAG" ] && set -- "$$@" --max-block-lag "$$MAX_BLOCK_LAG"
        [ -n "$$FRESHNESS_THRESHOLD" ] && set -- "$$@" --freshness-threshold "$$FRESHNESS_THRESHOLD"
        [ -n "$$KEEP_WARM_INTERVAL" ] && set -- "$$@" --keep-warm-interval "$$KEEP_WARM_INTERVAL"
        [ -n "$$HALT_DURATION_ON_FORK" ] && set -- "$$@" --halt-duration-on-fork "$$HALT_DURATION_ON_FORK"
        [ -n "$$API_TIMEOUT" ] && set -- "$$@" --api-timeout "$$API_TIMEOUT"

        if [ -n "$$VERBOSE" ]; then
          set -- "$$@" "-$$VERBOSE"
        fi

        exec helios-light-client "$$@"
      '
    networks:
      - appnet

  consumer-app:
    image: alpine:3.20
    depends_on:
      - helios-light-client
    command: |
      sh -c '
        set -e
        apk add --no-cache curl jq >/dev/null
        API_URL="http://helios-light-client:8080/v1/status"
        INTERVAL="10"
        # Wait for the API to be ready (HTTP 200) to avoid initial errors
        for i in 1 2 3 4 5; do
          if curl -sf "$$API_URL" >/dev/null; then break; fi
          sleep 5
        done
        while true; do
          if RESP=$(curl -sf "$$API_URL"); then
            HEIGHT=$(echo "$$RESP" | jq -r .block_height)
            HASH=$(echo "$$RESP" | jq -r .block_hash)
            TIME=$(echo "$$RESP" | jq -r .block_timestamp)
            echo "Successfully fetched status height=$$HEIGHT hash=$$HASH time=$$TIME"
          else
            echo "Error while fetching status"
          fi
          sleep "$$INTERVAL"
        done
      '
    networks:
      - appnet

networks:
  appnet: