Automatically vacuum database if it gets too large in the Docker container (#792)

docker/node/entry.sh

@@ -1,5 +1,8 @@
 #!/bin/bash
 
+PATH="${PATH:-/bin}:/usr/bin"
+export PATH
+
 set -euo pipefail
 IFS=$'\n\t'
 
@@ -18,10 +21,45 @@ case "${network}" in
 esac
 
 nanodir="${HOME}/RaiBlocks${dirSuffix}"
+dbFile="${nanodir}/data.ldb"
 mkdir -p "${nanodir}"
 if [ ! -f "${nanodir}/config.json" ]; then
         echo "Config File not found, adding default."
         cp "/usr/share/raiblocks/config/${network}.json" "${nanodir}/config.json"
 fi
 
-/usr/bin/rai_node --daemon
+pid=''
+firstTimeComplete=''
+while true; do
+	if [ -n "${firstTimeComplete}" ]; then
+		sleep 10
+	fi
+	firstTimeComplete='true'
+
+	if [ -f "${dbFile}" ]; then
+		dbFileSize="$(stat -c %s "${dbFile}" 2>/dev/null)"
+		if [ "${dbFileSize}" -gt $[1024 * 1024 * 1024 * 20] ]; then
+			echo "ERROR: Database size grew above 20GB (size = ${dbFileSize})" >&2
+
+			while [ -n "${pid}" ]; do
+				kill "${pid}" >/dev/null 2>/dev/null || :
+				if ! kill -0 "${pid}" >/dev/null 2>/dev/null; then
+					pid=''
+				fi
+			done
+
+			rai_node --vacuum
+		fi
+	fi
+
+	if [ -n "${pid}" ]; then
+		if ! kill -0 "${pid}" >/dev/null 2>/dev/null; then
+			pid=''
+		fi
+	fi
+
+	if [ -z "${pid}" ]; then
+		rai_node --daemon &
+		pid="$!"
+	fi
+done