#!/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.
#
# 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="Streaming - Snapshot Kernel tracing"

CURDIR=$(dirname $0)/
TESTDIR=$CURDIR/../../..
EVENT_NAME="sched_switch"
PID_RELAYD=0
SESSION_NAME=""
CHANNEL_NAME="chan1"

TRACE_PATH=$(mktemp -d)

NUM_TESTS=36

source $TESTDIR/utils/utils.sh

# LTTng kernel modules check
out=`ls /lib/modules/$(uname -r)/extra | grep lttng`
if [ -z "$out" ]; then
	BAIL_OUT "LTTng modules not detected."
fi

function snapshot_add_output ()
{
	local sess_name=$1
	local trace_path=$2
	local name=$3
	local extra_opt=""

	if [ ! -z $name ]; then
		extra_opt="-n $name"
	fi

	$TESTDIR/../src/bin/lttng/$LTTNG_BIN snapshot add-output -s $sess_name $extra_opt $trace_path >/dev/null 2>&1
	ok $? "Added snapshot output $trace_path"
}

# Test a snapshot using a default name for the output destination.
function test_kernel_default_name_with_del()
{
	diag "Test kernel snapshot streaming with default name with delete output"
	create_lttng_session_no_output $SESSION_NAME
	enable_lttng_mmap_overwrite_kernel_channel $SESSION_NAME $CHANNEL_NAME
	lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME $CHANNEL_NAME
	start_lttng_tracing $SESSION_NAME
	snapshot_add_output $SESSION_NAME "net://localhost"
	lttng_snapshot_record $SESSION_NAME

	# Validate test
	validate_trace $EVENT_NAME $TRACE_PATH/$HOSTNAME/snapshot-1*
	if [ $? -ne 0 ]; then
		return $?
	fi

	lttng_snapshot_del_output $SESSION_NAME 1
	snapshot_add_output $SESSION_NAME "net://localhost"
	lttng_snapshot_record $SESSION_NAME

	# Validate test with the next ID since a del output was done prior.
	validate_trace $EVENT_NAME $TRACE_PATH/$HOSTNAME/snapshot-2*
	if [ $? -ne 0 ]; then
		return $?
	fi

	stop_lttng_tracing $SESSION_NAME
	destroy_lttng_session $SESSION_NAME

	return 0
}

# Test a snapshot using a default name for the output destination.
function test_kernel_default_name()
{
	diag "Test kernel snapshot streaming with default name"
	create_lttng_session_no_output $SESSION_NAME
	enable_lttng_mmap_overwrite_kernel_channel $SESSION_NAME $CHANNEL_NAME
	lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME $CHANNEL_NAME
	start_lttng_tracing $SESSION_NAME
	snapshot_add_output $SESSION_NAME "net://localhost"
	lttng_snapshot_record $SESSION_NAME
	stop_lttng_tracing $SESSION_NAME
	destroy_lttng_session $SESSION_NAME
	# Validate test
	validate_trace $EVENT_NAME $TRACE_PATH/$HOSTNAME/snapshot-1*
	out=$?

	return $out
}

# Test a snapshot using a custom name for the output destination.
function test_kernel_custom_name()
{
	local out
	local name="asnapshotname"

	diag "Test kernel snapshot streaming with custom name"
	create_lttng_session_no_output $SESSION_NAME
	enable_lttng_mmap_overwrite_kernel_channel $SESSION_NAME $CHANNEL_NAME
	lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME $CHANNEL_NAME
	start_lttng_tracing $SESSION_NAME
	snapshot_add_output $SESSION_NAME "net://localhost" $name
	lttng_snapshot_record $SESSION_NAME
	stop_lttng_tracing $SESSION_NAME
	destroy_lttng_session $SESSION_NAME

	if ls $TRACE_PATH/$HOSTNAME/$name* &> /dev/null; then
		ok 0 "Custom name snapshot exists"
		# Validate test
		validate_trace $EVENT_NAME $TRACE_PATH/$HOSTNAME/$name-*
		out=$?
	else
		fail "No custom name snapshot found"
		out=1
	fi

	return $out
}

plan_tests $NUM_TESTS

print_test_banner "$TEST_DESC"

if [ "$(id -u)" == "0" ]; then
	isroot=1
else
	isroot=0
fi

skip $isroot "Root access is needed. Skipping all kernel streaming tests." $NUM_TESTS ||
{
	start_lttng_relayd "-o $TRACE_PATH"
	start_lttng_sessiond

	tests=( test_kernel_default_name test_kernel_custom_name \
			test_kernel_default_name_with_del )

	for fct_test in ${tests[@]};
	do
		SESSION_NAME=$(randstring 16 0)
		${fct_test}
		if [ $? -eq 0 ]; then
			# Only delete if successful
			rm -rf $TRACE_PATH
		else
			break
		fi
	done

	stop_lttng_sessiond
	stop_lttng_relayd
}