#!/bin/bash
#
# Copyright (C) - 2013 Christian Babeux <christian.babeux@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.
#
# This library 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 Lesser General Public License for more
# 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

TEST_DESC="Tracefile count limits"

CURDIR=$(dirname $0)/
TESTDIR=$CURDIR/../../..

TESTAPP_PATH="$TESTDIR/utils/testapp"
TESTAPP_NAME="gen-ust-events"
TESTAPP_BIN="$TESTAPP_PATH/$TESTAPP_NAME/$TESTAPP_NAME"

STATS_BIN="$TESTDIR/utils/babelstats.pl"
NUM_TESTS=146

source $TESTDIR/utils/utils.sh

if [ ! -x "$TESTAPP_BIN" ]; then
	BAIL_OUT "No UST events binary detected."
fi

function wait_apps
{
	while [ -n "$(pidof $TESTAPP_NAME)" ]; do
		sleep 0.5
	done
	pass "Wait for applications to end"
}

function enable_lttng_channel_count_limit ()
{
	sess_name="$1"
	channel_name="$2"
	tracefile_count_limit="$3"

	test_name="Enable channel $channel_name "
	test_name+="for session $sess_name: "
	test_name+="$tracefile_count_limit tracefiles"

	$TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-channel \
	    -u $channel_name -s $sess_name \
	    -C 4096 -W $tracefile_count_limit \
	    --overwrite >/dev/null 2>&1

	ok $? "$test_name"
}

function enable_ust_lttng_event_per_channel ()
{
	sess_name="$1"
	event_name="$2"
	channel_name="$3"

	test_name="Enable event $event_name "
	test_name+="for session $sess_name "
	test_name+="in channel $channel_name"

	$TESTDIR/../src/bin/lttng/$LTTNG_BIN enable-event "$event_name" \
	    -s $sess_name -u -c $channel_name >/dev/null 2>&1

	ok $? "$test_name"
}

function validate_min_max
{
	stats="$1"
	field="$2"
	expected_min="$3"
	expected_max="$4"

	echo $stats | grep -q -E "$field $expected_min $expected_max"
	return $?
}

function validate_file_count
{
	path="$1"
	file_pattern="$2"
	expected_max_count="$3"

	count=`find $path -name "$file_pattern" -type f | wc -l`

	if [ "$count" -gt "$expected_max_count" ]; then
	    fail "Validate file count: $file_pattern"
	    diag "File count: $count expected: $expected_max_count"
	else
	    pass "Validate file count: $file_pattern"
	fi
}

function test_tracefile_count_limit ()
{
	count_limit="$1"
	trace_path=$(mktemp -d)
	session_name=$(randstring 16 0)
	channel_name="channel"
	event_name="tp:tptest"
	num_iter=1000
	expected_max=$(($num_iter - 1))

	diag "Test tracefile count limit : $count_limit tracefiles"

	create_lttng_session $session_name $trace_path

	enable_lttng_channel_count_limit \
	    $session_name $channel_name $count_limit

	enable_ust_lttng_event_per_channel \
	    $session_name $event_name $channel_name

	start_lttng_tracing $session_name

	$TESTAPP_BIN $num_iter >/dev/null 2>&1 &

	wait_apps

	stop_lttng_tracing $session_name

	destroy_lttng_session $session_name

	# Validate tracing dir

	num_cpu=`nproc`

	for cpuno in $(seq 0 $(($num_cpu - 1)))
	do
		validate_file_count \
		    $trace_path "${channel_name}_${cpuno}_*" $count_limit
	done

	# Validate tracing data

	stats=`babeltrace $trace_path | $STATS_BIN --tracepoint $event_name`

	validate_min_max "$stats" "intfield" "[0-9]+" "$expected_max"
	ok $? "Trace validation - intfield"

	validate_min_max "$stats" "netintfield" "[0-9]+" "$expected_max"
	ok $? "Trace validation - netintfield"

	validate_min_max "$stats" "longfield" "[0-9]+" "$expected_max"
	ok $? "Trace validation - longfield"

	rm -rf $trace_path
}

plan_tests $NUM_TESTS

print_test_banner "$TEST_DESC"

start_lttng_sessiond

LIMITS=("1" "2" "4" "8" "10" "16" "32" "64")

for limit in ${LIMITS[@]};
do
	test_tracefile_count_limit $limit
done

stop_lttng_sessiond