#!/bin/bash
#
# sfa   Wraps PLCAPI into the SFA compliant API
#
# hopefully right after plc
# chkconfig: 2345 61 39
#
# description:   Wraps PLCAPI into the SFA compliant API
#

# source function library
. /etc/init.d/functions

# Default locations
PGDATA=/var/lib/pgsql/data
postgresql_conf=$PGDATA/postgresql.conf
pghba_conf=$PGDATA/pg_hba.conf
postgresql_sysconfig=/etc/sysconfig/pgsql

# PLC consolidated (merged) config file
plc_whole_config=/etc/planetlab/plc_config.xml
# SFA consolidated (merged) config file
sfa_whole_config=/etc/sfa/sfa_config.xml
# SFA default config (read-only template)
sfa_default_config=/etc/sfa/default_config.xml
# SFA local (site-dependent) file
sfa_local_config=/etc/sfa/configs/site.xml

# Source sfa shell config if present 
[ -f /etc/sfa/sfa_config ] && . /etc/sfa/sfa_config

# Export so that we do not have to specify -p to psql invocations
export PGPORT=$SFA_DB_PORT

##########
# Total number of errors
ERRORS=0

# Count the exit status of the last command
check ()
{
    ERRORS=$(($ERRORS+$?))
}

# can't trust the return of service postgresql start / nor status
function postgresql_check () {

    # wait until postmaster is up and running - or 10s max
    if status postmaster >& /dev/null && [ -f /var/lock/subsys/postgresql ] ; then
	# The only way we can be sure is if we can access it
	for i in $(seq 1 10) ; do
	    # Must do this as the postgres user initially (before we
	    # fix pg_hba.conf to passwordless localhost access).
	    su -c 'psql -U postgres -c "" template1' postgres && return 0
	    sleep 1
	done
    fi

    return 1
}


# Regenerate configuration files - almost verbatim from plc.init
function reload () {
    force=$1

    # Regenerate the main configuration file from default values
    # overlaid with site-specific and current values.
    # Thierry -- 2007-07-05 : values in plc_config.xml are *not* taken into account here
    files=( $sfa_default_config $sfa_local_config )
    for file in "${files[@]}" ; do
	if [ -n "$force" -o $file -nt $sfa_whole_config ] ; then
	    tmp=$(mktemp /tmp/sfa_config.xml.XXXXXX)
	    plc-config --xml "${files[@]}" >$tmp
	    if [ $? -eq 0 ] ; then
		mv $tmp $sfa_whole_config
		chmod 444 $sfa_whole_config
	    else
		echo "SFA: Warning: Invalid configuration file(s) detected"
		rm -f $tmp
	    fi
	    break
	fi
    done

    # Convert configuration to various formats
    if [ -n "$force" -o $sfa_whole_config -nt /etc/sfa/sfa_config ] ; then
	plc-config --shell $sfa_whole_config > /etc/sfa/sfa_config
    fi
    if [ -n "$force" -o $sfa_whole_config -nt /etc/sfa/sfa_config.py ] ; then
	plc-config --python $sfa_whole_config > /etc/sfa/sfa_config.py
    fi
#    if [ -n "$force" -o $sfa_whole_config -nt /etc/sfa/php/sfa_config.php ] ; then
#	mkdir -p /etc/sfa/php
#	plc-config --php  $sfa_whole_config >/etc/sfa/php/sfa_config.php
#    fi

    # [re]generate the sfa_component_config
    # this is a server-side thing but produces a file that somehow needs to be pushed
    # on the planetlab nodes; in the case where sfa and myplc run on different boxes 
    # (or there is no myplc at all) this should be turned off
    # as the component manager is not operational yet we skip this for now
    #gen-sfa-cm-config.py        

    # reload the shell version
    [ -f /etc/sfa/sfa_config ] && . /etc/sfa/sfa_config

}

### initialize DB (don't chkconfig postgresql on)
function db_start () {
    
    # only if enabled
    [ "$SFA_DB_ENABLED" == 1 ] || return

    if ! rpm -q myplc >& /dev/null; then

	######## standalone deployment - no colocated myplc

	######## sysconfig 
	# Set data directory and redirect startup output to /var/log/pgsql
	mkdir -p $(dirname $postgresql_sysconfig)
	# remove previous definitions
	touch $postgresql_sysconfig
	tmp=${postgresql_sysconfig}.new
	( egrep -v '^(PGDATA=|PGLOG=|PGPORT=)' $postgresql_sysconfig 
	    echo "PGDATA=$PGDATA"
	    echo "PGLOG=/var/log/pgsql"
	    echo "PGPORT=$SFA_DB_PORT"
	) >> $tmp ; mv -f $tmp $postgresql_sysconfig

	######## /var/lib/pgsql/data 
	# Fix ownership (rpm installation may have changed it)
	chown -R -H postgres:postgres $(dirname $PGDATA)

	# PostgreSQL must be started at least once to bootstrap
	# /var/lib/pgsql/data
	if [ ! -f $postgresql_conf ] ; then
	    service postgresql initdb &> /dev/null || :
	    check
	fi

	######## /var/lib/pgsql/data/postgresql.conf
	registry_ip=""
	foo=$(python -c "import socket; print socket.gethostbyname(\"$SFA_REGISTRY_HOST\")") && registry_ip="$foo"
	# Enable DB server. drop Postgresql<=7.x
	# PostgreSQL >=8.0 defines listen_addresses
	# listen on a specific IP + localhost, more robust when run within a vserver
	sed -i -e '/^listen_addresses/d' $postgresql_conf
	if [ -z "$registry_ip" ] ; then
	    echo "listen_addresses = 'localhost'" >> $postgresql_conf
	else
	    echo "listen_addresses = '${registry_ip},localhost'" >> $postgresql_conf
	fi
	# tweak timezone to be 'UTC'
	sed -i -e '/^timezone=/d' $postgresql_conf
	echo "timezone='UTC'" >> $postgresql_conf

	######## /var/lib/pgsql/data/pg_hba.conf
	# Disable access to all DBs from all hosts
	sed -i -e '/^\(host\|local\)/d' $pghba_conf

	# Enable passwordless localhost access
	echo "local all all trust" >>$pghba_conf
	# grant access
	(
	    echo "host $SFA_DB_NAME $SFA_DB_USER 127.0.0.1/32 password"
	    [ -n "$registry_ip" ] && echo "host $SFA_DB_NAME $SFA_DB_USER ${registry_ip}/32 password"
	) >>$pghba_conf

    if [ "$SFA_GENERIC_FLAVOUR" == "openstack" ] ; then
        [ -n "$registry_ip" ] && echo "host nova nova ${registry_ip}/32 password" >> $pghba_conf
    fi   
	
	# Fix ownership (sed -i changes it)
	chown postgres:postgres $postgresql_conf $pghba_conf

	######## compute a password if needed
	if [ -z "$SFA_DB_PASSWORD" ] ; then
	    SFA_DB_PASSWORD=$(uuidgen)
	    plc-config --category=sfa_db --variable=password --value="$SFA_DB_PASSWORD" --save=$sfa_local_config $sfa_local_config >& /dev/null
	    reload force
	fi

    else

        ######## we are colocated with a myplc
	# no need to worry about the pgsql setup (see /etc/plc.d/postgresql)
	# myplc enforces the password for its user
	PLC_DB_USER=$(plc-config --category=plc_db --variable=user)
	PLC_DB_PASSWORD=$(plc-config --category=plc_db --variable=password)
	# store this as the SFA user/password 
	plc-config --category=sfa_db --variable=user --value=$PLC_DB_USER --save=$sfa_local_config $sfa_local_config >& /dev/null
	plc-config --category=sfa_db --variable=password --value=$PLC_DB_PASSWORD --save=$sfa_local_config $sfa_local_config >& /dev/null
	reload force
    fi

    ######## Start up the server
    # not too nice, but.. when co-located with myplc we'll let it start/stop postgresql
    if ! rpm -q myplc >& /dev/null ; then
	echo STARTING...
	service postgresql start >& /dev/null
    fi
    postgresql_check
    check
	
    ######## make sure we have the user and db created
    # user
    if ! psql -U $SFA_DB_USER -c "" template1 >/dev/null 2>&1 ; then
	psql -U postgres -c "CREATE USER $SFA_DB_USER PASSWORD '$SFA_DB_PASSWORD'" template1 >& /dev/null
    else
	psql -U postgres -c "ALTER USER $SFA_DB_USER WITH PASSWORD '$SFA_DB_PASSWORD'" template1 >& /dev/null
    fi
    check
    
    # db
    if ! psql -U $SFA_DB_USER -c "" $SFA_DB_NAME >/dev/null 2>&1 ; then
	createdb -U postgres --template=template0 --encoding=UNICODE --owner=$SFA_DB_USER $SFA_DB_NAME
	check
    fi
    check

    MESSAGE=$"Checking for PostgreSQL server"
    echo -n "$MESSAGE"
    [ "$ERRORS" == 0 ] && success "$MESSAGE" || failure "$MESSAGE" ; echo
}

# shutdown DB
function db_stop () {

    # only if enabled
    [ "$SFA_DB_ENABLED" == 1 ] || return

    # not too nice, but.. when co-located with myplc we'll let it start/stop postgresql
    if ! rpm -q myplc >& /dev/null ; then
	service postgresql stop >& /dev/null
	check
	MESSAGE=$"Stopping PostgreSQL server"
	echo -n "$MESSAGE"
	[ "$ERRORS" == 0 ] && success "$MESSAGE" || failure "$MESSAGE" ; echo
    fi
}

function start() {
    
    reload

    db_start

    # install peer certs
    action $"SFA installing peer certs" daemon /usr/bin/sfa-start.py -t -d $OPTIONS 

    [ "$SFA_REGISTRY_ENABLED" == 1 ] && action $"SFA Registry" daemon /usr/bin/sfa-start.py -r -d $OPTIONS
    
    [ "$SFA_AGGREGATE_ENABLED" == 1 ] && action $"SFA Aggregate" daemon /usr/bin/sfa-start.py -a -d $OPTIONS
        
    [ "$SFA_SM_ENABLED" == 1 ] && action "SFA SliceMgr" daemon /usr/bin/sfa-start.py -s -d $OPTIONS

    [ "$SFA_FLASHPOLICY_ENABLED" == 1 ] && \
        action "Flash Policy Server" daemon /usr/bin/sfa_flashpolicy.py --file="$SFA_FLASHPOLICY_CONFIG_FILE" --port=$SFA_FLASHPOLICY_PORT -d

    touch /var/lock/subsys/sfa-start.py

}

function stop() {
    action $"Shutting down SFA" killproc sfa-start.py

    db_stop

    rm -f /var/lock/subsys/sfa-start.py
}


case "$1" in
    start) start ;;
    stop) stop ;;
    reload) reload force ;;
    restart) stop; start ;;
    condrestart)
	if [ -f /var/lock/subsys/sfa-start.py ]; then
            stop
            start
	fi
	;;
    status)
	status sfa-start.py
	RETVAL=$?
	;;
    *)
	echo $"Usage: $0 {start|stop|reload|restart|condrestart|status}"
	exit 1
	;;
esac

exit $RETVAL