rules_loop.sh

#!/usr/bin/env bash

# Copyright 2008, 2009, 2010, 2011, 2012 Roland Olbricht
#
# This file is part of Overpass_API.
#
# Overpass_API is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# Overpass_API is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with Overpass_API.  If not, see <http://www.gnu.org/licenses/>.

if [[ -z $1 ]]; then
	{
		echo "Usage: $0 database_dir [desired_cpu_load]"
		exit 0
	}
fi

CPU_LOAD=${2:-100}
DB_DIR="$(pwd)/$1"

EXEC_DIR="$(dirname "$0")/"
if [[ ! ${EXEC_DIR:0:1} == "/" ]]; then
	{
		EXEC_DIR="$(pwd)/$EXEC_DIR"
	}
fi

pushd "$EXEC_DIR" || exit 1

while true; do
	{
        if [[ -z "${OVERPASS_DIFF_URL}" ]]; then
            echo "OVERPASS_DIFF_URL is not set - updates disabled, assuming areas created on init, sleeping forever"
            sleep infinity
        else
			START=$(date +%s)
			echo "$(date '+%F %T'): update started" >>"$DB_DIR/rules_loop.log"
			./osm3s_query --progress --rules <"$DB_DIR/rules/areas.osm3s"
			echo "$(date '+%F %T'): update finished" >>"$DB_DIR/rules_loop.log"
			WORK_TIME=$(($(date +%s) - START))
			SLEEP_TIME=$((WORK_TIME * 100 / CPU_LOAD - WORK_TIME))
			# let SLEEP_TIME be at least 3 seconds
			SLEEP_TIME=$((SLEEP_TIME < 3 ? 3 : SLEEP_TIME))
			echo "It took $WORK_TIME to run the loop. Desired load is: ${CPU_LOAD}%. Sleeping: $SLEEP_TIME"
			sleep "$SLEEP_TIME"
		fi
	}
done