#!/bin/bash
#
# Copyright (C) - 2013 David Goulet <dgoulet@efficios.com>
#
# This library is free software; you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; version 2.1 of the License.  details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA

CURDIR=$(dirname $0)/
TESTDIR=$CURDIR/..
LAUNCH_APP="launch_ust_app"
KILL_RELAYD_HELPER="kill_relayd"
SESSION_NAME="stress"
EVENT_NAME="tp:tptest"
LOG_FILE_SESSIOND="sessiond.log"
LOG_FILE_RELAYD="relayd.log"
CHANNEL_NAME="channel0"
NR_APP=5
NR_SESSION=5
NR_LOOP=100000
COREDUMP_FILE=$(cat /proc/sys/kernel/core_pattern)
NUM_TESTS=16

TEST_DESC="Stress test - $NR_SESSION sessions per UID streaming with $NR_APP apps. The relayd is killed sporadically"

source $TESTDIR/utils/utils.sh

# MUST set TESTDIR before calling those functions

function enable_channel_per_uid()
{
    local sess_name=$1
    local channel_name=$2

    $TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-channel --buffers-uid -u $channel_name -s $sess_name >/dev/null 2>&1
    ok $? "Enable channel $channel_name per UID for session $sess_name"
}

function lttng_create_session_uri
{
	local name=$1

	# Create session with default path
	$TESTDIR/../src/bin/lttng/$LTTNG_BIN create $name -U net://localhost >/dev/null 2>&1
	ok $? "Create session on net://localhost"
}

function check_sessiond()
{
	if [ -z "$(pidof lt-lttng-sessiond)" ]; then
		local str_date=$(date +%H%M%S-%d%m%Y)

		diag "!!!The session daemon died unexpectedly!!!"
		mv $LOG_FILE_SESSIOND $LOG_FILE_SESSIOND-$str_date
		if [ -e $COREDUMP_FILE ]; then
			mv $COREDUMP_FILE $COREDUMP_FILE-$str_date
		fi
		exit 1
	fi
}

function start_sessiond()
{
	local SESSIOND_BIN="lttng-sessiond"

	validate_kernel_version
	if [ $? -ne 0 ]; then
		fail "Start session daemon"
		BAIL_OUT "*** Kernel too old for session daemon tests ***"
	fi

	if [ -z $(pidof lt-$SESSIOND_BIN) ]; then
		# We have to start it like this so the ulimit -c is used by this
		# process. Also, we collect any error message printed out.
		#$TESTDIR/../src/bin/lttng-sessiond/$SESSIOND_BIN --quiet --consumerd32-path="$TESTDIR/../src/bin/lttng-consumerd/lttng-consumerd" --consumerd64-path="$TESTDIR/../src/bin/lttng-consumerd/lttng-consumerd" >$LOG_FILE_SESSIOND 2>&1 &
		$TESTDIR/../src/bin/lttng-sessiond/$SESSIOND_BIN --verbose-consumer -vvv --consumerd32-path="$TESTDIR/../src/bin/lttng-consumerd/lttng-consumerd" --consumerd64-path="$TESTDIR/../src/bin/lttng-consumerd/lttng-consumerd" >$LOG_FILE_SESSIOND 2>&1 &
		#$TESTDIR/../src/bin/lttng-sessiond/$SESSIOND_BIN --consumerd32-path="$TESTDIR/../src/bin/lttng-consumerd/lttng-consumerd" --consumerd64-path="$TESTDIR/../src/bin/lttng-consumerd/lttng-consumerd" >$LOG_FILE_SESSIOND 2>&1 &
		status=$?
		# Wait for sessiond to bootstrap
		sleep 2
		ok $status "Start session daemon"
	fi
}

function start_relayd
{
	local opt=$1
	local RELAYD_BIN="lttng-relayd"

	if [ -z $(pidof lt-$RELAYD_BIN) ]; then
		$TESTDIR/../src/bin/lttng-relayd/$RELAYD_BIN $opt >$LOG_FILE_RELAYD 2>&1 &
		ok $? "Start lttng-relayd (opt: \"$opt\")"
	fi
}

function check_relayd()
{
	if [ -z "$(pidof lt-lttng-relayd)" ]; then
		local str_date=$(date +%H%M%S-%d%m%Y)

		#diag "Relay daemon died. Starting it again"
		if [ -e $COREDUMP_FILE ]; then
			mv $COREDUMP_FILE $COREDUMP_FILE-$str_date
		fi
		start_relayd
	fi
}

test_stress()
{
	for b in $(seq 1 $NR_LOOP); do
		for a in $(seq 1 $NR_SESSION); do
			lttng_create_session_uri $SESSION_NAME-$a
			check_sessiond
			check_relayd
			enable_channel_per_uid $SESSION_NAME-$a $CHANNEL_NAME
			check_sessiond
			check_relayd
			enable_ust_lttng_event $SESSION_NAME-$a $EVENT_NAME
			check_sessiond
			check_relayd
			start_lttng_tracing $SESSION_NAME-$a
			check_sessiond
			check_relayd
		done

		for a in $(seq 1 $NR_SESSION); do
			stop_lttng_tracing $SESSION_NAME-$a
			check_sessiond
			check_relayd
			destroy_lttng_session $SESSION_NAME-$a
			check_sessiond
			check_relayd
		done
	done

	return 0
}

function cleanup()
{
	diag "Cleaning up!"
	killall -9 $LAUNCH_APP
	killall -9 $KILL_RELAYD_HELPER
	stop_lttng_sessiond
	stop_lttng_relayd
}

function sighandler()
{
	cleanup
	#rm $LOG_FILE_SESSIOND $LOG_FILE_RELAYD
	exit 1
}

trap sighandler SIGINT

# Make sure we collect a coredump if possible.
ulimit -c unlimited

# MUST set TESTDIR before calling those functions
plan_tests $NUM_TESTS

print_test_banner "$TEST_DESC"

TRACE_PATH=$(mktemp -d)

start_relayd "-o $TRACE_PATH"
start_sessiond

diag "Starting applications launcher"

# Start NR_APP applications script that will spawn apps non stop.
./$TESTDIR/stress/$LAUNCH_APP $NR_APP &
# Launch the helper script that will randomly kill the relayd at vitam eternam.
./$TESTDIR/stress/$KILL_RELAYD_HELPER 1 1 &

test_stress
out=$?
if [ $out -ne 0 ]; then
	cleanup
	exit $out
fi

cleanup
rm -rf $TRACE_PATH
rm $LOG_FILE_SESSIOND $LOG_FILE_RELAYD
exit 0