lnd: rebalance channel autopilot

rebalance-autopilot.sh

#! /usr/bin/env bash

PCT_INIT=100
PCT_MIN=25
PCT_DROP=25

MIN_AMOUNT=10000 # don't rebalance below this amount (def: 10k)
MIN_LOCAL=1000000 # min outbound sats per chan (def: 1M)
MIN_REMOTE=1000000 # min inbound sats per chan (def: 1M)
FEE_FACTOR=0.95 # (def: 1.0)

# channels to be rebalanced per run/cycle
CHANS_PER_ITER_TO=30
CHANS_PER_ITER_FROM=50

# `nice` process value (+19 = lowest prio)
NICENESS='+19'

# time to sleep between runs/cycles, in minutes (picked randomly)
SLEEP_MIN=20
SLEEP_MAX=60

# workaround for 32-Bit Raspbian Bullseye
LD_PRELOAD="/usr/lib/arm-linux-gnueabihf/libatomic.so.1.2.0"

cd "${HOME}/rebalance-lnd" || exit 1
PCT_CUR="${PCT_INIT}"

while true; do
    echo -en "\nStarting cycle with PCT_CUR=${PCT_CUR} ...\n\n"

    for _ in $(seq 1 "${CHANS_PER_ITER_TO}"); do
        # increase outbound capacity
        LD_PRELOAD="${LD_PRELOAD}" nice -n"${NICENESS}" ./rebalance.py \
            --to="-1" \
            --min-amount="${MIN_AMOUNT}" \
            --min-local="${MIN_LOCAL}" \
            --percentage="${PCT_CUR}" \
            --fee-factor="${FEE_FACTOR}"
    done

    for _ in $(seq 1 "${CHANS_PER_ITER_FROM}"); do
        # increase inbound capacity
        LD_PRELOAD="${LD_PRELOAD}" nice -n"${NICENESS}" ./rebalance.py \
            --from="-1" \
            --min-amount="${MIN_AMOUNT}" \
            --min-remote="${MIN_REMOTE}" \
            --percentage="${PCT_CUR}" \
            --fee-factor="${FEE_FACTOR}"
    done
    
    # pick random timeframe from interval and sleep
    SLEEP_MINS=$((SLEEP_MIN + RANDOM % (SLEEP_MAX-SLEEP_MIN)))
    echo -en "\n\nSleeping for ${SLEEP_MINS} minutes ...\n" && sleep "$((60 * SLEEP_MINS))"

    # modify "--percentage" parameter before next run/cycle
    if [ "${PCT_CUR}" -gt "${PCT_MIN}" ]; then
        PCT_CUR="$((PCT_CUR * (100-PCT_DROP) / 100))"
    else
        PCT_CUR="${PCT_INIT}" # reset to start
    fi
done