Add script to remove old tasks from sessions

tests/scripts/delete_old_tasks.php

@@ -0,0 +1,139 @@
+<?php
+/* For licensing terms, see /license.txt */
+/**
+ * This script removes previous tasks from disk to clear space.
+ * Configure the date on lines 22-23 to change the dates after/before which 
+ * to delete.
+ * This works based on sessions dates (it will not delete tasks from 
+ * base courses).
+ * This script should be located inside the tests/scripts/ folder to work
+ * @author Paul Patrocinio <ppatrocino@icpna.edu.pe>
+ * @author Percy Santiago <psantiago@icpna.edu.pe>
+ * @author Yannick Warnier <yannick.warnier@beeznest.com>
+ */
+exit(); //remove this line to execute from the command line
+if (PHP_SAPI !== 'cli') {
+    die('This script can only be executed from the command line');
+}
+
+require __DIR__.'/../../main/inc/conf/configuration.php';
+
+// Dates
+$expiryDate = '2015-06-01'; //session start date must be < to be considered
+$fromDate = '2011-01-01'; //session start date must be > to be considered
+
+$sessionCourses = array();
+$coursesCodes = array();
+$coursesDirs = array();
+if (!$conexion = mysql_connect($_configuration['db_host'], $_configuration['db_user'], $_configuration['db_password'])) {
+    echo 'Could not connect to database';
+    exit;
+}
+
+if (!mysql_select_db($_configuration['main_database'], $conexion)) {
+    echo 'Could not select database '.$_configuration['main_database'];
+    exit;
+}
+echo "[".time()."] Querying sessions\n";
+$sql = "SELECT id FROM session where access_start_date < '$expiryDate' AND access_start_date > '$fromDate'";
+
+$res = mysql_query($sql, $conexion);
+if ($res === false) {
+    //die("Error querying sessions: ".Database::error($res)."\n");
+}
+
+$countSessions = mysql_num_rows($res);
+$sql = "SELECT count(*) FROM session";
+$resc = mysql_query($sql, $conexion);
+if ($resc === false) {
+    //die("Error querying sessions: ".Database::error($res)."\n");
+}
+$countAllSessions = mysql_result($resc, 0, 0);
+echo "[".time()."] Found $countSessions sessions between $fromDate and $expiryDate on a total of $countAllSessions sessions."."\n";
+
+while ($session = mysql_fetch_assoc($res)) {
+    $sql2 = "SELECT c.id AS cid, c.code as ccode, c.directory as cdir
+            FROM course c, session_rel_course s 
+            WHERE s.id_session = ".$session['id']." 
+            AND s.course_code = c.code";
+    $res2 = mysql_query($sql2, $conexion); //Database::query($sql2);
+
+    if ($res2 === false) {
+        die("Error querying courses for session ".$session['id'].": ".mysql_error($res2)."\n");
+    }
+
+    if (mysql_num_rows($res2) > 0) {
+        while ($course = mysql_fetch_assoc($res2)) {
+            $sessionCourses[$session['id']] = $course['cid'];
+			//$_SESSION['session_course'] = $sessionCourses;
+
+            if (empty($coursesCodes[$course['cid']])) {
+                $coursesCodes[$course['cid']] = $course['ccode'];
+            }
+            if (empty($coursesDirs[$course['cid']])) {
+                $coursesDirs[$course['cid']] = $course['cdir'];
+            }
+        }
+    } 
+}
+echo "[".time()."] Filled courses arrays. Now checking tasks...\n";
+/**
+ * Locate and destroy the expired tasks
+ */ 
+//$sessionCourse = $_SESSION['session_course'];
+
+$totalSize = 0;
+foreach ($sessionCourses as $sid => $cid) {
+    // Check if a folder already exists in this session
+    // Folders are exclusive to sessions. If a folder already exists in 
+    // another session, you will not be allowed to create the same folder in 
+    // another session. As such, folders belong to one and only one session.
+    $sql = "SELECT id, url FROM c_student_publication
+            WHERE filetype = 'folder'
+            AND c_id = $cid
+            AND session_id = $sid
+            AND active = 1
+            AND url LIKE '%ALP%'";
+
+    $resCarpetas = mysql_query($sql, $conexion); //Database::query($sql);
+
+	if (mysql_num_rows($resCarpetas) > 0) {
+        while ($rowDemo = mysql_fetch_assoc($resCarpetas)) {
+
+            $carpetaAlpElimina = $_configuration['root_sys'].'courses/'.$coursesDirs[$cid].'/work'.$rowDemo['url'];
+
+            //echo "rm -rf ".$carpetaAlpElimina."\n";
+            $size = folderSize($carpetaAlpElimina);
+            $totalSize += $size;
+            echo "Freeing $size of a total $totalSize bytes in $carpetaAlpElimina\n";
+            exec('rm -rf '.$carpetaAlpElimina);
+        }
+
+	$sqldel = "DELETE FROM c_student_publication
+		WHERE
+		c_id = $cid
+		AND session_id = $sid AND active = 1;";
+        $resdel = mysql_query($sqldel);
+        if ($resdel === false) {
+            echo "Error querying sessions: ".Database::error($resdel)."\n";
+        }
+    } 
+}
+echo "[".time()."] Deleted tasks from $countSessions sessions between $fromDate and $expiryDate on a total of $countAllSessions sessions."."\n";
+
+/**
+ * Helper function to calculate size of a folder
+ * @author See php.net comments on filesize()
+ */
+function folderSize($dir) {
+    $size = 0;
+    $contents = glob(rtrim($dir, '/').'/*', GLOB_NOSORT);
+    foreach ($contents as $contents_value) {
+        if (is_file($contents_value)) {
+            $size += filesize($contents_value);
+        } else {
+            $size += folderSize($contents_value);
+        }
+    }
+    return $size;
+}