# Copyright (c) 2007 - 2020 by mod_tile contributors (see AUTHORS file)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program 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 General Public License
# along with this program; If not, see http://www.gnu.org/licenses/.

#!/bin/sh

set -e

#------------------------------------------------------------------------------
# AJT - change directory to mod_tile directory so that we can run replag
# and other things directly from this script when run from cron.
# Change the actual location to wherever installed locally.
#------------------------------------------------------------------------------
export PATH=.:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
ACCOUNT=renderaccount
cd /home/$ACCOUNT/src/mod_tile/

#------------------------------------------------------------------------------
# Extra OSM2PGSQL_OPTIONS may need setting if a tag transform script is
# in use.  See https://github.com/SomeoneElseOSM/SomeoneElse-style and
# http://wiki.openstreetmap.org/wiki/User:SomeoneElse/Ubuntu_1404_tileserver_load
# The database name always needs setting.
#------------------------------------------------------------------------------
OSMOSIS_BIN=osmosis
OSM2PGSQL_BIN=osm2pgsql
TRIM_BIN=/home/$ACCOUNT/src/regional/trim_osc.py

DBNAME=gis
OSM2PGSQL_OPTIONS="-d $DBNAME"
#------------------------------------------------------------------------------
# When using trim_osc.py we can define either a bounding box (such as this
# example for England and Wales) or a polygon.
# See https://github.com/zverik/regional .
# This area will usually correspond to the data originally loaded.
#------------------------------------------------------------------------------
TRIM_OPTIONS="-d $DBNAME"
TRIM_REGION_OPTIONS="-b -14.17 48.85 2.12 61.27"
#TRIM_REGION_OPTIONS="-p region.poly"

BASE_DIR=/var/lib/mod_tile
LOG_DIR=/var/log/tiles/
WORKOSM_DIR=$BASE_DIR/.osmosis

LOCK_FILE=/tmp/openstreetmap-update-expire-lock.txt
CHANGE_FILE=$BASE_DIR/changes.osc.gz
EXPIRY_FILE=$BASE_DIR/dirty_tiles
STOP_FILE=$BASE_DIR/stop.txt

OSMOSISLOG=$LOG_DIR/osmosis.log
PGSQLLOG=$LOG_DIR/osm2pgsql.log
EXPIRYLOG=$LOG_DIR/expiry.log
RUNLOG=$LOG_DIR/run.log

#------------------------------------------------------------------------------
# The tile expiry section below can re-render, delete or dirty expired tiles.
# By default, tiles between EXPIRY_MINZOOM and EXPIRY_MAXZOOM are rerendered.
# "render_expired" can optionally delete (and/or dirty) tiles above a certail
# threshold rather than rendering them.
# Here we rerender tiles between zoom levels 13 and 18 and delete between 19
# and 20.
#------------------------------------------------------------------------------
EXPIRY_MINZOOM=13
EXPIRY_TOUCHFROM=21
EXPIRY_DELETEFROM=19
EXPIRY_MAXZOOM=20

#*************************************************************************
#*************************************************************************

m_info()
{
        echo "[`date +"%Y-%m-%d %H:%M:%S"`] $$ $1" >> "$RUNLOG"
}

m_error()
{
    echo "[`date +"%Y-%m-%d %H:%M:%S"`] $$ [error] $1" >> "$RUNLOG"
    
    m_info "resetting state"
    /bin/cp $WORKOSM_DIR/last.state.txt $WORKOSM_DIR/state.txt || true
    
    rm "$CHANGE_FILE" || true
    rm "$EXPIRY_FILE.$$" || true
    rm "$LOCK_FILE"
    exit
}

m_ok()
{
    echo "[`date +"%Y-%m-%d %H:%M:%S"`] $$ $1" >> "$RUNLOG"
}

getlock()
{
    if [ -s $1 ]; then
        if [ "$(ps -p `cat $1` | wc -l)" -gt 1 ]; then
            return 1 #false
        fi
    fi
    
    echo $$ >"$1"
    return 0 #true
}

freelock()
{
    rm "$1"
    rm "$CHANGE_FILE"
}


if [ $# -eq 1 ] ; then
    m_info "Initialising Osmosis replication system to $1"
    mkdir $WORKOSM_DIR
    $OSMOSIS_BIN --read-replication-interval-init workingDirectory=$WORKOSM_DIR 1>&2 2> "$OSMOSISLOG"
    wget "http://replicate-sequences.osm.mazdermind.de/?"$1"T00:00:00Z" -O $WORKOSM_DIR/state.txt
    mv $WORKOSM_DIR/configuration.txt $WORKOSM_DIR/configuration_orig.txt
    sed "s!baseUrl=http://planet.openstreetmap.org/replication/minute!baseUrl=https://planet.openstreetmap.org/replication/minute!" $WORKOSM_DIR/configuration_orig.txt > $WORKOSM_DIR/configuration.txt
else
# make sure the lockfile is removed when we exit and then claim it

    if ! getlock "$LOCK_FILE"; then
        m_info "pid `cat $LOCK_FILE` still running"
        exit 3
    fi

    if [ -e $STOP_FILE ]; then
        m_info "stopped"
        exit 2
    fi

# -----------------------------------------------------------------------------
# Add disk space check from https://github.com/zverik/regional
# -----------------------------------------------------------------------------
MIN_DISK_SPACE_MB=500

if `python -c "import os, sys; st=os.statvfs('$BASE_DIR'); sys.exit(1 if st.f_bavail*st.f_frsize/1024/1024 > $MIN_DISK_SPACE_MB else 0)"`; then
    m_info "there is less than $MIN_DISK_SPACE_MB MB left"
    exit 4
fi

    seq=`cat $WORKOSM_DIR/state.txt | grep sequenceNumber | cut -d= -f2`

    m_ok "start import from seq-nr $seq, replag is `osmosis-db_replag -h`"

    /bin/cp $WORKOSM_DIR/state.txt $WORKOSM_DIR/last.state.txt
    m_ok "downloading diff"
    
    if ! $OSMOSIS_BIN --read-replication-interval workingDirectory=$WORKOSM_DIR --simplify-change --write-xml-change $CHANGE_FILE 1>&2 2> "$OSMOSISLOG"; then
        m_error "Osmosis error"
    fi
    
m_ok "filtering diff"
if ! $TRIM_BIN $TRIM_OPTIONS $TRIM_REGION_OPTIONS  -z $CHANGE_FILE $CHANGE_FILE 1>&2 2>> "$RUNLOG"; then
    m_error "Trim_osc error"
fi

    m_ok "importing diff"
#------------------------------------------------------------------------------
# Previously openstreetmap-tiles-update-expire tried to dirty layer
# "$EXPIRY_MAXZOOM - 3" (which was 15) only.  Instead we write all expired
# tiles in range to the list (note the "-" rather than ":" in the "-e"
# parameter).
#------------------------------------------------------------------------------
    if ! $OSM2PGSQL_BIN -a --slim -e$EXPIRY_MINZOOM-$EXPIRY_MAXZOOM $OSM2PGSQL_OPTIONS -o "$EXPIRY_FILE.$$" $CHANGE_FILE 1>&2 2> "$PGSQLLOG"; then
        m_error "osm2pgsql error"
    fi

#------------------------------------------------------------------------------
# The lockfile is normally removed before we expire tiles because that is 
# something thatcan be done in parallel with further processing.  In order to
# avoid rework, if actually rerendering is done rather than just deleting or
# dirtying, it makes sense to move it lower down.
#------------------------------------------------------------------------------
#    m_ok "Import complete; removing lock file"
#    freelock "$LOCK_FILE"

    m_ok "expiring tiles"
#------------------------------------------------------------------------------
# When expiring tiles we need to define the style sheet if it's not "default".
# In this case it's "ajt".
# Previously all tiles on the "dirty" list between $EXPIRY_MINZOOM and 
# $EXPIRY_MAXZOOM were dirtied.  We currently re-render 
# tiles >= $EXPIRY_MINZOOM and < $EXPIRY_DELETEFROM, expiry from 14 and 
# delete >= $EXPIRY_DELETEFROM and <= $EXPIRY_MAXZOOM.
# The default path to renderd.sock is fixed.
#
# Note no --touch-from=$EXPIRY_TOUCHFROM 
#------------------------------------------------------------------------------
    if ! render_expired --map=ajt --min-zoom=$EXPIRY_MINZOOM --delete-from=$EXPIRY_DELETEFROM --max-zoom=$EXPIRY_MAXZOOM -s /var/run/renderd/renderd.sock < "$EXPIRY_FILE.$$" 2>&1 | tail -8 >> "$EXPIRYLOG"; then
        m_info "Expiry failed"
    fi

    rm "$EXPIRY_FILE.$$"

#------------------------------------------------------------------------------
# Only remove the lock file after expiry (if system is slow we want to delay
# the next import, not have multiple render_expired processes running)    
#------------------------------------------------------------------------------
    freelock "$LOCK_FILE"
   
    m_ok "Done with import"
    

    

fi
