#!/sbin/openrc-run

name="Core Lightning daemon"
description="Bitcoin Lightning Network node daemon"

: ${LIGHTNINGD_CONF:=/etc/lightning/${SVCNAME}.conf}
: ${LIGHTNINGD_HOME:=/var/lib/lightning}
: ${LIGHTNINGD_LOGFILE:=/var/log/${SVCNAME}.log}
: ${LIGHTNINGD_PIDFILE:=/run/lightning/${SVCNAME}.pid}
: ${LIGHTNINGD_RPCFILE:=/run/lightning/${SVCNAME}.rpc}
: ${LIGHTNINGD_USER:=lightning:lightning}

command="/usr/bin/lightningd"
command_args="
	--conf=${LIGHTNINGD_CONF} --lightning-dir=${LIGHTNINGD_HOME}
	--log-file=${LIGHTNINGD_LOGFILE}
	--pid-file=${LIGHTNINGD_PIDFILE} --rpc-file=${LIGHTNINGD_RPCFILE}
	--daemon"
command_user="${LIGHTNINGD_USER}"
directory="${LIGHTNINGD_HOME}"
pidfile="${LIGHTNINGD_PIDFILE}"
start_stop_daemon_args="${LIGHTNINGD_NICE:+--nicelevel=${LIGHTNINGD_NICE}}"

depend() {
	config "${LIGHTNINGD_CONF}"
	need localmount net
	use dns

	local wallet
	if wallet=$(get_wallet_uri) && echo "${wallet}" |
		# The regex below will detect all the typical ways of
		# identifying a PostgreSQL server running on the localhost.
		# Examples:
		#   postgres://
		#   postgres://localhost
		#   postgres://localhost:5432
		#   postgres://lightning@localhost/lightningdb
		#   postgres://lightning:password@localhost/lightningdb
		#   postgres:///lightningdb
		#   postgres://%2Fpath%2Fto%2Fsocket/lightningdb
		# The "localhost" part can instead be "127.0.0.1" or "[::1]".
		# Any query part is ignored if present. In particular, a
		# specification of "host=localhost" in the query part will NOT
		# be detected, but in that case the authority part will likely
		# be blank, and that will be detected as localhost. This would
		# only cause us to "need postgresql" when we shouldn't and not
		# vice versa, so it's safe.
		grep -Eq '^postgres(ql)?://((([-A-Za-z0-9._~!$&'\''()*+,:;=]|%[[:xdigit:]]{2})*@)?((localhost|127\.0\.0\.1|\[::1\])(:[0-9]*)?|%2[Ff]([-A-Za-z0-9._~!$&'\''()*+,;=]|%[[:xdigit:]]{2})*))?(/|$)'
	then
		need postgresql
	else # just in case the above auto-detection didn't work
		after postgresql
	fi

	local rpchost
	if rpchost=$(get_bitcoin_rpchost) && { [ -z "${rpchost}" ] ||
		echo "${rpchost}" | grep -Eqx '(localhost|127\.0\.0\.1|\[::1\])' ; }
	then
		need bitcoind
	else # just in case rpchost is a host name that resolves to the local host
		after bitcoind
	fi
}

get_wallet_uri() {
	sed -ne 's/^\s*wallet=\(.*\)$/\1/p' "${LIGHTNINGD_CONF}"
}

get_bitcoin_rpchost() {
	sed -ne 's/^\s*bitcoin-rpcconnect=\(.*\)$/\1/p' "${LIGHTNINGD_CONF}"
}

find_network() {
	if [ ! "${network}" ] ; then
		network=$(sed -e 's/^\s*network=\(.*\)$/\1/;t;d' "${LIGHTNINGD_CONF}")
		if [ ! "${network}" ] ; then
			eerror "You must set the 'network' option in ${LIGHTNINGD_CONF}!"
			exit 1
		fi
	fi
}

migrate_data_files() {
	find_network
	if [ -e "${LIGHTNINGD_HOME}/hsm_secret" -a ! -e "${LIGHTNINGD_HOME}/${network}/hsm_secret" ] ; then
		ewarn "Migrating data files to ${LIGHTNINGD_HOME}/${network}"
		checkpath --directory --owner="${LIGHTNINGD_USER}" --mode=0750 -- "${LIGHTNINGD_HOME}/${network}"
		local each ; for each in hsm_secret lightningd.sqlite3 gossip_store ; do
			[ -e "${LIGHTNINGD_HOME}/${each}" ] &&
				mv --verbose --no-clobber -- "${LIGHTNINGD_HOME}/${each}" "${LIGHTNINGD_HOME}/${network}/${each}"
		done
	fi
}

start_pre() {
	migrate_data_files
	[ -z "${LIGHTNINGD_LOGFILE}" ] || checkpath --file --owner="${LIGHTNINGD_USER}" --mode=0644 -- "${LIGHTNINGD_LOGFILE}"
	checkpath --directory --owner="${LIGHTNINGD_USER}" --mode=0755 -- "$(dirname -- "${LIGHTNINGD_PIDFILE}")" "$(dirname -- "${LIGHTNINGD_RPCFILE}")"
	if [ "${LIGHTNINGD_RPCFILE}" != "${LIGHTNINGD_HOME}/${SVCNAME}.rpc" -a -S "${LIGHTNINGD_HOME}/${SVCNAME}.rpc" ] ; then
		ebegin "Removing obsolete ${LIGHTNINGD_HOME}/${SVCNAME}.rpc"
		rm -- "${LIGHTNINGD_HOME}/${SVCNAME}.rpc"
		eend $?
	fi
}

start_post() {
	if [ -S "${LIGHTNINGD_RPCFILE}" ] ; then
		find_network
		[ -e "${LIGHTNINGD_HOME}/${network}/lightning-rpc" ] ||
			ln --symbolic --relative --force --no-dereference -- "${LIGHTNINGD_RPCFILE}" "${LIGHTNINGD_HOME}/${network}/lightning-rpc"
	fi
}