#!/bin/bash
#
# Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
#
# SPDX-License-Identifier: LGPL-2.1-only
#

CURDIR=$(dirname $0)/
TESTDIR=$CURDIR/..
LAUNCH_APP="launch_ust_app"
SESSION_NAME="stress"
EVENT_NAME="tp:tptest"
LOG_FILE="sessiond.log"
CHANNEL_NAME="channel0"
NUM_TESTS=16
NR_APP=10
NR_SESSION=5
NR_LOOP=1000
COREDUMP_FILE=$(cat /proc/sys/kernel/core_pattern)
APPS_PID=

TEST_DESC="Stress test - $NR_SESSION sessions per UID with $NR_APP apps"

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

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

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

	if [ -z $(lttng_pgrep lt-$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 --background --consumerd32-path="$TESTDIR/../src/bin/lttng-consumerd/lttng-consumerd" --consumerd64-path="$TESTDIR/../src/bin/lttng-consumerd/lttng-consumerd" >$LOG_FILE 2>&1
		status=$?
		ok $status "Start session daemon"
	fi
}

test_stress()
{
	for b in $(seq 1 $NR_LOOP); do
		for a in $(seq 1 $NR_SESSION); do
			create_lttng_session_ok $SESSION_NAME-$a $TRACE_PATH
			check_sessiond
			enable_channel_per_uid $SESSION_NAME-$a $CHANNEL_NAME
			check_sessiond
			enable_ust_lttng_event_ok $SESSION_NAME-$a $EVENT_NAME
			check_sessiond
			start_lttng_tracing_ok $SESSION_NAME-$a
			check_sessiond
		done

		for a in $(seq 1 $NR_SESSION); do
			stop_lttng_tracing_ok $SESSION_NAME-$a
			check_sessiond
			destroy_lttng_session_ok $SESSION_NAME-$a
			check_sessiond
		done
	done

	return 0
}

function cleanup()
{
	diag "Cleaning up!"
	for p in ${APPS_PID}; do
		kill -s SIGKILL ${p}
		wait ${p} 2>/dev/null
	done
	APPS_PID=
	stop_lttng_sessiond
}

function sighandler()
{
	cleanup
	rm $LOG_FILE
	full_cleanup
}

trap sighandler SIGINT SIGTERM

# 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"

start_sessiond

diag "Starting applications"

# Start NR_APP applications script that will spawn apps non stop.
./$TESTDIR/stress/$LAUNCH_APP $NR_APP &
APPS_PID="${APPS_PID} ${!}"

TRACE_PATH=$(mktemp -d)

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

cleanup
rm -rf $TRACE_PATH
rm $LOG_FILE
exit 0