#!/bin/bash
#
# Copyright (C) - 2012 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 - Kernel tracing"

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

TRACE_PATH=$(mktemp -d)

NUM_TESTS=11

source $TESTDIR/utils/utils.sh

print_test_banner "$TEST_DESC"

# 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 lttng_create_session_uri
{
	# Create session with default path
	$TESTDIR/../src/bin/lttng/$LTTNG_BIN create $SESSION_NAME -U net://localhost >/dev/null 2>&1

	ok $? "Create session $SESSION_NAME"
}

function test_kernel_before_start ()
{
	diag "Test kernel streaming with event enable BEFORE start"
	lttng_create_session_uri
	lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME
	start_lttng_tracing $SESSION_NAME
	# Give a second
	sleep 1
	stop_lttng_tracing $SESSION_NAME
	destroy_lttng_session $SESSION_NAME

	# We can not predict _yet_ when the trace is available so we have to do a
	# arbitratry sleep to validate the trace.
	diag "Wait 3 seconds for the trace to be written on disk"
	for i in `seq 1 3`; do
		sleep 1
	done
}

# Deactivated since this feature is not yet available where we can enable
# an event AFTERE tracing has started.
function test_kernel_after_start ()
{
	diag "Test kernel streaming with event enable AFTER start"
	lttng_create_session_uri
	start_lttng_tracing $SESSION_NAME
	lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME
	# Give a second
	sleep 1
	stop_lttng_tracing $SESSION_NAME
	destroy_lttng_session $SESSION_NAME
}

plan_tests $NUM_TESTS

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_sessiond
	start_lttng_relayd "-o $TRACE_PATH"

	tests=( test_kernel_before_start )

	for fct_test in ${tests[@]};
	do
		SESSION_NAME=$(randstring 16 0)
		${fct_test}

		# Validate test
		validate_trace $EVENT_NAME $TRACE_PATH/$HOSTNAME/$SESSION_NAME*
		if [ $? -eq 0 ]; then
			# Only delete if successful
			rm -rf $TRACE_PATH
		else
			break
		fi
	done

	stop_lttng_sessiond
	stop_lttng_relayd
}