#!/usr/bin/env bash

source /env-data.sh

SETUP_LOCKFILE="${ROOT_CONF}/.postgresql.conf.lock"
if [ -f "${SETUP_LOCKFILE}" ]; then
	return 0
fi

# This script will setup necessary configuration to enable replications

# Refresh configuration in case environment settings changed.
cat $CONF.template > $CONF

# This script will setup necessary configuration to optimise for PostGIS and to enable replications
cat >> $CONF <<EOF
wal_level = hot_standby
max_wal_senders = ${PG_MAX_WAL_SENDERS}
wal_keep_segments = ${PG_WAL_KEEP_SEGMENTS}
superuser_reserved_connections= 10
min_wal_size =${MIN_WAL_SIZE}
max_wal_size= ${WAL_SIZE}
wal_keep_segments= 64
hot_standby = on
listen_addresses = '${IP_LIST}'
shared_buffers = 500MB
work_mem = 16MB
maintenance_work_mem = ${MAINTAINANCE_WORK_MEM}
wal_buffers = 1MB
random_page_cost = 2.0
xmloption = 'document'
max_parallel_maintenance_workers = ${MAINTAINANCE_WORKERS}
max_parallel_workers = ${MAX_WORKERS}
checkpoint_timeout = ${CHECK_POINT_TIMEOUT}
#archive_mode=on
#archive_command = 'test ! -f ${WAL_ARCHIVE}/%f && cp -r %p ${WAL_ARCHIVE}/%f'
primary_conninfo = 'host=${REPLICATE_FROM} port=${REPLICATE_PORT} user=${REPLICATION_USER} password=${REPLICATION_PASS} sslmode=${PGSSLMODE}'
recovery_target_timeline=${TARGET_TIMELINE}
recovery_target_action=${TARGET_ACTION}
promote_trigger_file = '${PROMOTE_FILE}'
EOF



echo -e $EXTRA_CONF >> $CONF

# Optimise PostgreSQL shared memory for PostGIS
# shmall units are pages and shmmax units are bytes(?) equivalent to the desired shared_buffer size set in setup_conf.sh - in this case 500MB
echo "kernel.shmmax=543252480" >> /etc/sysctl.conf
echo "kernel.shmall=2097152" >> /etc/sysctl.conf

# Put lock file to make sure conf was not reinitialized
touch ${SETUP_LOCKFILE}