bitcoind_connections

#!/bin/sh
# -*- sh -*-
# vim: ft=sh

: << =cut

=head1 NAME

bitcoind_connections - Plugin to monitor the number of open connections

=head1 CONFIGURATION

 [bitcoind*]
    user bitcoin
    env.binary bitcoin-cli
    env.data_dir /var/lib/bitcoin

=head1 AUTHOR

Cedric Felizard

=head1 LICENSE

AGPLv3+

=head1 MAGIC MARKERS

 #%# family=auto
 #%# capabilities=autoconf

=cut

BINARY=${binary:-"/usr/bin/bitcoin-cli"}
DATA_DIR=${data_dir:-"/var/lib/bitcoin"}

if [ "$1" = "autoconf" ]; then
    autoconf="yes"

    command -v $BINARY >/dev/null || autoconf="no"

    echo $autoconf
    exit 0
fi

peers=$($BINARY -datadir=$DATA_DIR getpeerinfo | grep addrlocal | awk -F '"' '{print $4}' | grep ':8333$' | sort | uniq -c | sed 's/:8333$//' | awk '{print $2 " " $1}')

if [ "$1" = "config" ]; then
    echo 'graph_title Connection count'
    echo 'graph_vlabel number of connections'
    echo 'graph_category bitcoind'
    echo 'graph_info This graph shows the number of open connections.'
    echo 'total.label total'
    echo 'outbound.label outbound'

    for address in $(echo $peers | awk '{for (i=1;i<=NF;i+=2) { print $i }}'); do
        echo "$(echo $address | sha1sum | cut -c1-8).label ${address}"
    done

    exit 0
fi

echo "total.value $($BINARY -datadir=$DATA_DIR getconnectioncount)"
echo "outbound.value $($BINARY -datadir=$DATA_DIR getpeerinfo | grep -c '"inbound": false')"

odd=0
for address_or_count in $peers; do
    odd=$((1-odd))

    if [ $odd -eq 1 ]; then
        echo -n "$(echo $address_or_count | sha1sum | cut -c1-8).value "
    else
        echo $address_or_count
    fi
done