#!/bin/bash
#
# Copyright (C) 2015 Julien Desfossez <jdesfossez@efficios.com>
#
# SPDX-License-Identifier: LGPL-2.1-only

TEST_DESC="Streaming - Kernel tracing"

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

TRACE_PATH=$(mktemp -d -t tmp.test_regen_metadata_kernel_trace_path.XXXXXX)

NUM_TESTS=32

source $TESTDIR/utils/utils.sh

function test_kernel_streaming ()
{
	local metadata_path

	diag "Test kernel streaming with metadata regeneration"
	create_lttng_session_uri $SESSION_NAME net://localhost
	lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME
	start_lttng_tracing_ok $SESSION_NAME
	echo -n "100" > /proc/lttng-test-filter-event

	# Baseline
	stop_lttng_tracing_ok $SESSION_NAME
	validate_trace $EVENT_NAME $TRACE_PATH/$HOSTNAME/$SESSION_NAME*

	# Find the metadata file
	metadata_path=$(find "$TRACE_PATH/$HOSTNAME/$SESSION_NAME"* -name "metadata")

	# Empty the metadata file
	echo -n > "$metadata_path"

	start_lttng_tracing_ok $SESSION_NAME
	regenerate_metadata_ok $SESSION_NAME
	stop_lttng_tracing_ok $SESSION_NAME
	# Validate test
	validate_trace $EVENT_NAME $TRACE_PATH/$HOSTNAME/$SESSION_NAME*
	destroy_lttng_session_ok $SESSION_NAME
	rm -rf "$TRACE_PATH"
}

function test_kernel_local ()
{
	local metadata_path

	diag "Test kernel local with metadata regeneration"
	create_lttng_session_ok $SESSION_NAME $TRACE_PATH
	lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME
	start_lttng_tracing_ok $SESSION_NAME

	# Baseline
	echo -n "100" > /proc/lttng-test-filter-event
	stop_lttng_tracing_ok $SESSION_NAME
	validate_trace $EVENT_NAME "$TRACE_PATH"

	# Find the metadata file
	metadata_path=$(find "$TRACE_PATH"* -name "metadata")

	# Empty the metadata file
	echo -n > "$metadata_path"

	start_lttng_tracing_ok $SESSION_NAME
	regenerate_metadata_ok $SESSION_NAME
	stop_lttng_tracing_ok $SESSION_NAME

	validate_trace $EVENT_NAME $TRACE_PATH
	destroy_lttng_session_ok $SESSION_NAME

	rm -rf "$TRACE_PATH"
}

function test_kernel_local_snapshot_after_regenerate_metadata ()
{
	diag "Test kernel local snapshot after regenerate metadata"
	create_lttng_session_ok $SESSION_NAME "$TRACE_PATH" --snapshot
	lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME
	start_lttng_tracing_ok $SESSION_NAME

	echo -n "100" > /proc/lttng-test-filter-event

	regenerate_metadata_ok $SESSION_NAME
	lttng_snapshot_record $SESSION_NAME "$TRACE_PATH"
	stop_lttng_tracing_ok $SESSION_NAME

	validate_trace $EVENT_NAME "$TRACE_PATH"
	destroy_lttng_session_ok $SESSION_NAME

	rm -rf "$TRACE_PATH"
}

plan_tests $NUM_TESTS

print_test_banner "$TEST_DESC"

check_skip_kernel_test "$NUM_TESTS" "Skipping all tests." ||
{
	validate_lttng_modules_present

	start_lttng_relayd "-o $TRACE_PATH"
	start_lttng_sessiond
	modprobe lttng-test

	tests=( test_kernel_streaming test_kernel_local
		test_kernel_local_snapshot_after_regenerate_metadata )

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

	modprobe --remove lttng-test
	stop_lttng_sessiond
	stop_lttng_relayd
}