#!/bin/bash
set -eu
if [ $# -lt 1 ]; then
    echo "Usage: $0 <ip:port> [<max_dialer> [<random_seed>]]" >&2
    exit 1
fi

readonly addr=$1
readonly max_dialer=${2:-50}

if [[ $# -gt 2 ]]; then
    RANDOM=$3
fi

dialer=()
# shellcheck disable=SC2154
trap 'echo -n "stopping ... "; for c in "${dialer[@]}"; do docker rm -f "$c" >/dev/null; done; echo "done"' EXIT

while true; do
    dialer+=("$(docker run -d dialer /go/bin/dialer connect "$addr" "10")")

    if [ ${#dialer[@]} -gt "$max_dialer" ]; then
        rand=$(((RANDOM % max_dialer) + 1))
        container=${dialer[$rand]}
        docker rm -f "$container" >/dev/null &
        unset dialer[$rand]
        dialer=("${dialer[@]}")
    fi

    sleep 2
done