#!/usr/bin/env bash
# Run on rn-lab-host-01 (or the local dev machine running the Lab containers) WHILE
# boot-labs.js is running, to capture real per-Lab CPU/RAM/disk usage — `docker stats` is the
# ground truth here, not an estimate. Samples every 5s for the given duration and writes CSV.
set -euo pipefail
DURATION_SEC="${1:-120}"
OUT="${2:-./results/resource-sample-$(date +%s).csv}"
mkdir -p "$(dirname "$OUT")"

echo "timestamp,container,cpu_pct,mem_usage,mem_pct,net_io,block_io,pids" > "$OUT"
END=$(( $(date +%s) + DURATION_SEC ))
while [ "$(date +%s)" -lt "$END" ]; do
  docker stats --no-stream --format '{{.Name}},{{.CPUPerc}},{{.MemUsage}},{{.MemPerc}},{{.NetIO}},{{.BlockIO}},{{.PIDs}}' \
    | grep -E '^rootnode-lab-' \
    | while IFS=, read -r name cpu mem memp net block pids; do
        echo "$(date -u +%Y-%m-%dT%H:%M:%SZ),$name,$cpu,$mem,$memp,$net,$block,$pids" >> "$OUT"
      done
  sleep 5
done

echo "Written to $OUT"
echo "Summarize with: awk -F, 'NR>1{print \$2}' $OUT | sort -u   # containers seen"