History mechanism

Use case: rest API service

  * saved by default in data/history
  * same format as datastore.php
  * traced events:
     * save/edit/delete link
     * change settings or plugins settings
     * rename tag

1 files changed, 195 insertions, 0 deletions

diff --git a/tests/HistoryTest.php b/tests/HistoryTest.php
new file mode 100644
index 00000000..79322249
--- /dev/null
+++ b/tests/HistoryTest.php
@@ -0,0 +1,195 @@
+<?php
+
+require_once 'application/History.php';
+
+
+class HistoryTest extends PHPUnit_Framework_TestCase
+{
+    /**
+     * @var string History file path
+     */
+    protected static $historyFilePath = 'sandbox/history.php';
+
+    /**
+     * Delete history file.
+     */
+    public function tearDown()
+    {
+        @unlink(self::$historyFilePath);
+    }
+
+    /**
+     * Test that the history file is created if it doesn't exist.
+     */
+    public function testConstructFileCreated()
+    {
+        new History(self::$historyFilePath);
+        $this->assertFileExists(self::$historyFilePath);
+    }
+
+    /**
+     * Not writable history file: raise an exception.
+     *
+     * @expectedException Exception
+     * @expectedExceptionMessage History file isn't readable or writable
+     */
+    public function testConstructNotWritable()
+    {
+        touch(self::$historyFilePath);
+        chmod(self::$historyFilePath, 0440);
+        new History(self::$historyFilePath);
+    }
+
+    /**
+     * Not parsable history file: raise an exception.
+     *
+     * @expectedException Exception
+     * @expectedExceptionMessageRegExp /Could not parse history file/
+     */
+    public function testConstructNotParsable()
+    {
+        file_put_contents(self::$historyFilePath, 'not parsable');
+        // gzinflate generates a warning
+        @new History(self::$historyFilePath);
+    }
+
+    /**
+     * Test add link event
+     */
+    public function testAddLink()
+    {
+        $history = new History(self::$historyFilePath);
+        $history->addLink(['id' => 0]);
+        $actual = $history->getHistory()[0];
+        $this->assertEquals(History::CREATED, $actual['event']);
+        $this->assertTrue(new DateTime('-2 seconds') < DateTime::createFromFormat(DateTime::ATOM, $actual['datetime']));
+        $this->assertEquals(0, $actual['id']);
+
+        $history = new History(self::$historyFilePath);
+        $history->addLink(['id' => 1]);
+        $actual = $history->getHistory()[0];
+        $this->assertEquals(History::CREATED, $actual['event']);
+        $this->assertTrue(new DateTime('-2 seconds') < DateTime::createFromFormat(DateTime::ATOM, $actual['datetime']));
+        $this->assertEquals(1, $actual['id']);
+
+        $history = new History(self::$historyFilePath);
+        $history->addLink(['id' => 'str']);
+        $actual = $history->getHistory()[0];
+        $this->assertEquals(History::CREATED, $actual['event']);
+        $this->assertTrue(new DateTime('-2 seconds') < DateTime::createFromFormat(DateTime::ATOM, $actual['datetime']));
+        $this->assertEquals('str', $actual['id']);
+    }
+
+    /**
+     * Test updated link event
+     */
+    public function testUpdateLink()
+    {
+        $history = new History(self::$historyFilePath);
+        $history->updateLink(['id' => 1]);
+        $actual = $history->getHistory()[0];
+        $this->assertEquals(History::UPDATED, $actual['event']);
+        $this->assertTrue(new DateTime('-2 seconds') < DateTime::createFromFormat(DateTime::ATOM, $actual['datetime']));
+        $this->assertEquals(1, $actual['id']);
+    }
+
+    /**
+     * Test delete link event
+     */
+    public function testDeleteLink()
+    {
+        $history = new History(self::$historyFilePath);
+        $history->deleteLink(['id' => 1]);
+        $actual = $history->getHistory()[0];
+        $this->assertEquals(History::DELETED, $actual['event']);
+        $this->assertTrue(new DateTime('-2 seconds') < DateTime::createFromFormat(DateTime::ATOM, $actual['datetime']));
+        $this->assertEquals(1, $actual['id']);
+    }
+
+    /**
+     * Test updated settings event
+     */
+    public function testUpdateSettings()
+    {
+        $history = new History(self::$historyFilePath);
+        $history->updateSettings();
+        $actual = $history->getHistory()[0];
+        $this->assertEquals(History::SETTINGS, $actual['event']);
+        $this->assertTrue(new DateTime('-2 seconds') < DateTime::createFromFormat(DateTime::ATOM, $actual['datetime']));
+        $this->assertEmpty($actual['id']);
+    }
+
+    /**
+     * Make sure that new items are stored at the beginning
+     */
+    public function testHistoryOrder()
+    {
+        $history = new History(self::$historyFilePath);
+        $history->updateLink(['id' => 1]);
+        $actual = $history->getHistory()[0];
+        $this->assertEquals(History::UPDATED, $actual['event']);
+        $this->assertTrue(new DateTime('-2 seconds') < DateTime::createFromFormat(DateTime::ATOM, $actual['datetime']));
+        $this->assertEquals(1, $actual['id']);
+
+        $history->addLink(['id' => 1]);
+        $actual = $history->getHistory()[0];
+        $this->assertEquals(History::CREATED, $actual['event']);
+        $this->assertTrue(new DateTime('-2 seconds') < DateTime::createFromFormat(DateTime::ATOM, $actual['datetime']));
+        $this->assertEquals(1, $actual['id']);
+    }
+
+    /**
+     * Re-read history from file after writing an event
+     */
+    public function testHistoryRead()
+    {
+        $history = new History(self::$historyFilePath);
+        $history->updateLink(['id' => 1]);
+        $history = new History(self::$historyFilePath);
+        $actual = $history->getHistory()[0];
+        $this->assertEquals(History::UPDATED, $actual['event']);
+        $this->assertTrue(new DateTime('-2 seconds') < DateTime::createFromFormat(DateTime::ATOM, $actual['datetime']));
+        $this->assertEquals(1, $actual['id']);
+    }
+
+    /**
+     * Re-read history from file after writing an event and make sure that the order is correct
+     */
+    public function testHistoryOrderRead()
+    {
+        $history = new History(self::$historyFilePath);
+        $history->updateLink(['id' => 1]);
+        $history->addLink(['id' => 1]);
+
+        $history = new History(self::$historyFilePath);
+        $actual = $history->getHistory()[0];
+        $this->assertEquals(History::CREATED, $actual['event']);
+        $this->assertTrue(new DateTime('-2 seconds') < DateTime::createFromFormat(DateTime::ATOM, $actual['datetime']));
+        $this->assertEquals(1, $actual['id']);
+
+        $actual = $history->getHistory()[1];
+        $this->assertEquals(History::UPDATED, $actual['event']);
+        $this->assertTrue(new DateTime('-2 seconds') < DateTime::createFromFormat(DateTime::ATOM, $actual['datetime']));
+        $this->assertEquals(1, $actual['id']);
+    }
+
+    /**
+     * Test retention time: delete old entries.
+     */
+    public function testHistoryRententionTime()
+    {
+        $history = new History(self::$historyFilePath, 5);
+        $history->updateLink(['id' => 1]);
+        $this->assertEquals(1, count($history->getHistory()));
+        $arr = $history->getHistory();
+        $arr[0]['datetime'] = (new DateTime('-1 hour'))->format(DateTime::ATOM);
+        FileUtils::writeFlatDB(self::$historyFilePath, $arr);
+
+        $history = new History(self::$historyFilePath, 60);
+        $this->assertEquals(1, count($history->getHistory()));
+        $this->assertEquals(1, $history->getHistory()[0]['id']);
+        $history->updateLink(['id' => 2]);
+        $this->assertEquals(1, count($history->getHistory()));
+        $this->assertEquals(2, $history->getHistory()[0]['id']);
+    }
+}