Bash lnd rebalance helper

gistfile1.txt

#!/bin/bash

FAILFILE=./failcombinaties

# Clear out out lists
> /tmp/in
> /tmp/out

# Store invoices in an array for possible reuse
declare -a INVOICES

# List all active channels, and do some ugly formatting tricks
lncli listchannels --active_only --public_only |\
  jq -c '.channels[] | [.chan_id,.remote_pubkey,((.local_balance|tonumber)/((.remote_balance|tonumber)+1)),(.capacity|tonumber)]'|\
   sed 's/["\\[]//g' |\
   cut -d ']' -f1 |\
   sort -R |\
while read line; do
  # Going through all channels, building lists
  CHANID=$(echo $line | cut -d, -f1)
  KEY=$(echo $line | cut -d, -f2)
  LOCAL=$(echo $line | cut -d, -f3)
  TOTAL=$(echo $line | cut -d, -f4)

  # Determine here what channels should go on what list
  if [[ $LOCAL < 0.3 ]]; then
    # This channel has a low percentage on local side
    echo "$line" >> /tmp/in
  fi

  if [[ $LOCAL > 3 ]]; then
    # This channel has a high percentage on local side
    echo "$line" >> /tmp/out
  fi
done



# Now we will go through our lists and match them all up
PREVAMOUNT=0
while read in; do
  # Getting lines where we have a LOW local percentage
  CHANin=$(echo $in | cut -d, -f1)
  KEYin=$(echo $in | cut -d, -f2)
  LOCALin=$(echo $in | cut -d, -f3)
  TOTALin=$(echo $in | cut -d, -f4)

  # Match each IN with an OUT
  while read out; do
    CHANout=$(echo $out | cut -d, -f1)
    KEYout=$(echo $out | cut -d, -f2)
    LOCALout=$(echo $out | cut -d, -f3)
    TOTALout=$(echo $out | cut -d, -f4)
    echo
    echo "Now considering OUT $KEYout $CHANout $TOTALout"
    echo "Now considering IN  $KEYin $CHANin $TOTALin"
    
    # Use smaller side
    if [[ $TOTALout < $TOTALin ]]; then
      AMOUNT=$(( $TOTALout / 3 ))
    else
      AMOUNT=$(( $TOTALin / 3 ))
    fi
    
    # Cap at 250k sat
    echo "Calculated amount $AMOUNT"
    if [[ $AMOUNT > 100000 ]]; then
      AMOUNT=250000
    fi

    # Set a max fee
    MAXFEE=$(( $AMOUNT / 3000 ))

    # See if this failed before
    if grep -q "$CHANout $KEYin" $FAILFILE; then
      echo "This failed before
      continue"
    fi

    # Invoice for amount
    if [[ -z ${INVOICES[$AMOUNT]} ]]; then
      # We have not such an inv yet
      INV=$( lncli addinvoice --amt $AMOUNT | jq -r .payment_request )
      INVOICES[$AMOUNT]=$INV
    else
      INV=${INVOICES[$AMOUNT]}
    fi

    # The actual payment. Let LND do the heavy lifting here!!
    CMD="lncli payinvoice --force --allow_self_payment --outgoing_chan_id $CHANout --last_hop $KEYin --fee_limit $MAXFEE $INV"
    echo $CMD \# $AMOUNT sat total
    $CMD
    if [[ $? == 0 ]]; then
      echo "Payment succesful"
      exit 0
      # We quit. Start the script again. Our lists are now useless.
    fi

    # Not succesful, ban!
    echo "$CHANout $KEYin" >> $FAILFILE

    #sleep  0.5
    PREVAMOUNT=$AMOUNT
  done </tmp/out

done < /tmp/in