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moodle/lib/tests/session_redis_test.php
Don Bowman cf7b00b8cf
MDL-68696 sessions: Fixed redis session handler for readonly 
In 39770792ca62 read-only sessions were allowed.
In the redis case, as called from the mobile application,
this can lead to returning 'false' for session rather than ''.
2020-05-15 12:09:15 -04:00

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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Redis session tests.
*
* NOTE: in order to execute this test you need to set up
* Redis server and add configuration a constant
* to config.php or phpunit.xml configuration file:
*
* define('TEST_SESSION_REDIS_HOST', '127.0.0.1');
*
* @package core
* @author Russell Smith <mr-russ@smith2001.net>
* @copyright 2016 Russell Smith
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
* Unit tests for classes/session/redis.php.
*
* @package core
* @author Russell Smith <mr-russ@smith2001.net>
* @copyright 2016 Russell Smith
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @runClassInSeparateProcess
*/
class core_session_redis_testcase extends advanced_testcase {
/** @var $keyprefix This key prefix used when testing Redis */
protected $keyprefix = null;
/** @var $redis The current testing redis connection */
protected $redis = null;
public function setUp() {
global $CFG;
if (!extension_loaded('redis')) {
$this->markTestSkipped('Redis extension not loaded.');
}
if (!defined('TEST_SESSION_REDIS_HOST')) {
$this->markTestSkipped('Session test server not set. define: TEST_SESSION_REDIS_HOST');
}
$version = phpversion('Redis');
if (!$version) {
$this->markTestSkipped('Redis extension version missing');
} else if (version_compare($version, '2.0') <= 0) {
$this->markTestSkipped('Redis extension version must be at least 2.0: now running "' . $version . '"');
}
$this->resetAfterTest();
$this->keyprefix = 'phpunit'.rand(1, 100000);
$CFG->session_redis_host = TEST_SESSION_REDIS_HOST;
$CFG->session_redis_prefix = $this->keyprefix;
// Set a very short lock timeout to ensure tests run quickly. We are running single threaded,
// so unless we lock and expect it to be there, we will always see a lock.
$CFG->session_redis_acquire_lock_timeout = 1;
$CFG->session_redis_lock_expire = 70;
$this->redis = new Redis();
$this->redis->connect(TEST_SESSION_REDIS_HOST);
}
public function tearDown() {
if (!extension_loaded('redis') || !defined('TEST_SESSION_REDIS_HOST')) {
return;
}
$list = $this->redis->keys($this->keyprefix.'*');
foreach ($list as $keyname) {
$this->redis->del($keyname);
}
$this->redis->close();
}
public function test_normal_session_read_only() {
$sess = new \core\session\redis();
$sess->set_requires_write_lock(false);
$sess->init();
$this->assertSame('', $sess->handler_read('sess1'));
$this->assertTrue($sess->handler_close());
}
public function test_normal_session_start_stop_works() {
$sess = new \core\session\redis();
$sess->init();
$sess->set_requires_write_lock(true);
$this->assertTrue($sess->handler_open('Not used', 'Not used'));
$this->assertSame('', $sess->handler_read('sess1'));
$this->assertTrue($sess->handler_write('sess1', 'DATA'));
$this->assertTrue($sess->handler_close());
// Read the session again to ensure locking did what it should.
$this->assertTrue($sess->handler_open('Not used', 'Not used'));
$this->assertSame('DATA', $sess->handler_read('sess1'));
$this->assertTrue($sess->handler_write('sess1', 'DATA-new'));
$this->assertTrue($sess->handler_close());
$this->assertSessionNoLocks();
}
public function test_session_blocks_with_existing_session() {
$sess = new \core\session\redis();
$sess->init();
$sess->set_requires_write_lock(true);
$this->assertTrue($sess->handler_open('Not used', 'Not used'));
$this->assertSame('', $sess->handler_read('sess1'));
$this->assertTrue($sess->handler_write('sess1', 'DATA'));
$this->assertTrue($sess->handler_close());
// Sessions are not locked until they have been saved once.
$this->assertTrue($sess->handler_open('Not used', 'Not used'));
$this->assertSame('DATA', $sess->handler_read('sess1'));
$sessblocked = new \core\session\redis();
$sessblocked->init();
$sessblocked->set_requires_write_lock(true);
$this->assertTrue($sessblocked->handler_open('Not used', 'Not used'));
// Trap the error log and send it to stdOut so we can expect output at the right times.
$errorlog = tempnam(sys_get_temp_dir(), "rediserrorlog");
$this->iniSet('error_log', $errorlog);
try {
$sessblocked->handler_read('sess1');
$this->fail('Session lock must fail to be obtained.');
} catch (\core\session\exception $e) {
$this->assertContains("Unable to obtain session lock", $e->getMessage());
$this->assertContains('Cannot obtain session lock for sid: sess1', file_get_contents($errorlog));
}
$this->assertTrue($sessblocked->handler_close());
$this->assertTrue($sess->handler_write('sess1', 'DATA-new'));
$this->assertTrue($sess->handler_close());
$this->assertSessionNoLocks();
}
public function test_session_is_destroyed_when_it_does_not_exist() {
$sess = new \core\session\redis();
$sess->init();
$sess->set_requires_write_lock(true);
$this->assertTrue($sess->handler_open('Not used', 'Not used'));
$this->assertTrue($sess->handler_destroy('sess-destroy'));
$this->assertSessionNoLocks();
}
public function test_session_is_destroyed_when_we_have_it_open() {
$sess = new \core\session\redis();
$sess->init();
$sess->set_requires_write_lock(true);
$this->assertTrue($sess->handler_open('Not used', 'Not used'));
$this->assertSame('', $sess->handler_read('sess-destroy'));
$this->assertTrue($sess->handler_destroy('sess-destroy'));
$this->assertTrue($sess->handler_close());
$this->assertSessionNoLocks();
}
public function test_multiple_sessions_do_not_interfere_with_each_other() {
$sess1 = new \core\session\redis();
$sess1->set_requires_write_lock(true);
$sess1->init();
$sess2 = new \core\session\redis();
$sess2->set_requires_write_lock(true);
$sess2->init();
// Initialize session 1.
$this->assertTrue($sess1->handler_open('Not used', 'Not used'));
$this->assertSame('', $sess1->handler_read('sess1'));
$this->assertTrue($sess1->handler_write('sess1', 'DATA'));
$this->assertTrue($sess1->handler_close());
// Initialize session 2.
$this->assertTrue($sess2->handler_open('Not used', 'Not used'));
$this->assertSame('', $sess2->handler_read('sess2'));
$this->assertTrue($sess2->handler_write('sess2', 'DATA2'));
$this->assertTrue($sess2->handler_close());
// Open and read session 1 and 2.
$this->assertTrue($sess1->handler_open('Not used', 'Not used'));
$this->assertSame('DATA', $sess1->handler_read('sess1'));
$this->assertTrue($sess2->handler_open('Not used', 'Not used'));
$this->assertSame('DATA2', $sess2->handler_read('sess2'));
// Write both sessions.
$this->assertTrue($sess1->handler_write('sess1', 'DATAX'));
$this->assertTrue($sess2->handler_write('sess2', 'DATA2X'));
// Read both sessions.
$this->assertTrue($sess1->handler_open('Not used', 'Not used'));
$this->assertTrue($sess2->handler_open('Not used', 'Not used'));
$this->assertEquals('DATAX', $sess1->handler_read('sess1'));
$this->assertEquals('DATA2X', $sess2->handler_read('sess2'));
// Close both sessions
$this->assertTrue($sess1->handler_close());
$this->assertTrue($sess2->handler_close());
// Read the session again to ensure locking did what it should.
$this->assertSessionNoLocks();
}
public function test_multiple_sessions_work_with_a_single_instance() {
$sess = new \core\session\redis();
$sess->init();
$sess->set_requires_write_lock(true);
// Initialize session 1.
$this->assertTrue($sess->handler_open('Not used', 'Not used'));
$this->assertSame('', $sess->handler_read('sess1'));
$this->assertTrue($sess->handler_write('sess1', 'DATA'));
$this->assertSame('', $sess->handler_read('sess2'));
$this->assertTrue($sess->handler_write('sess2', 'DATA2'));
$this->assertSame('DATA', $sess->handler_read('sess1'));
$this->assertSame('DATA2', $sess->handler_read('sess2'));
$this->assertTrue($sess->handler_destroy('sess2'));
$this->assertTrue($sess->handler_close());
$this->assertSessionNoLocks();
$this->assertTrue($sess->handler_close());
}
public function test_session_exists_returns_valid_values() {
$sess = new \core\session\redis();
$sess->init();
$sess->set_requires_write_lock(true);
$this->assertTrue($sess->handler_open('Not used', 'Not used'));
$this->assertSame('', $sess->handler_read('sess1'));
$this->assertFalse($sess->session_exists('sess1'), 'Session must not exist yet, it has not been saved');
$this->assertTrue($sess->handler_write('sess1', 'DATA'));
$this->assertTrue($sess->session_exists('sess1'), 'Session must exist now.');
$this->assertTrue($sess->handler_destroy('sess1'));
$this->assertFalse($sess->session_exists('sess1'), 'Session should be destroyed.');
}
public function test_kill_sessions_removes_the_session_from_redis() {
global $DB;
$sess = new \core\session\redis();
$sess->init();
$this->assertTrue($sess->handler_open('Not used', 'Not used'));
$this->assertTrue($sess->handler_write('sess1', 'DATA'));
$this->assertTrue($sess->handler_write('sess2', 'DATA'));
$this->assertTrue($sess->handler_write('sess3', 'DATA'));
$sessiondata = new \stdClass();
$sessiondata->userid = 2;
$sessiondata->timecreated = time();
$sessiondata->timemodified = time();
$sessiondata->sid = 'sess1';
$DB->insert_record('sessions', $sessiondata);
$sessiondata->sid = 'sess2';
$DB->insert_record('sessions', $sessiondata);
$sessiondata->sid = 'sess3';
$DB->insert_record('sessions', $sessiondata);
$this->assertNotEquals('', $sess->handler_read('sess1'));
$sess->kill_session('sess1');
$this->assertEquals('', $sess->handler_read('sess1'));
$this->assertEmpty($this->redis->keys($this->keyprefix.'sess1.lock'));
$sess->kill_all_sessions();
$this->assertEquals(3, $DB->count_records('sessions'), 'Moodle handles session database, plugin must not change it.');
$this->assertSessionNoLocks();
$this->assertEmpty($this->redis->keys($this->keyprefix.'*'), 'There should be no session data left.');
}
public function test_exception_when_connection_attempts_exceeded() {
global $CFG;
$CFG->session_redis_port = 111111;
$actual = '';
$sess = new \core\session\redis();
try {
$sess->init();
} catch (RedisException $e) {
$actual = $e->getMessage();
}
$expected = 'Failed to connect (try 5 out of 5) to redis at ' . TEST_SESSION_REDIS_HOST . ':111111';
$this->assertDebuggingCalledCount(5);
$this->assertContains($expected, $actual);
}
/**
* Assert that we don't have any session locks in Redis.
*/
protected function assertSessionNoLocks() {
$this->assertEmpty($this->redis->keys($this->keyprefix.'*.lock'));
}
}
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