EVENT API in moodle - moodle

Question

I am new to moodle. I'm trying to write an Events API in moodle that will be called when a user logged in and logged out. I have created a local plugin and the directory structure is as follows
os_template/
├── classes
│ └── observer.php
├── db
│ └── events.php └── version.php
db/events.php
defined('MOODLE_INTERNAL') || die();
$observers = array(
array(
'eventname' => '\core\event\user_loggedin',
'callback' => '\local_ostemplate\local_ostemplateevents::user_loggedin',
),
array(
'eventname' => '\core\event\user_loggedout',
'callback' => '\local_ostemplate\local_ostemplateevents::user_loggedin',
),
);
classes/observer.php
namespace local_ostemplate;
class local_ostemplateevents
{
public static function user_loggedin(core\event\base $event)
{
file_put_contents("test.txt","User Logged in");
}
}
But no events are called when user logged in to the moodle. Anybody please help

Answer 1

Your observer class "local_ostemplateevents" must have the same name as the file it is in, due to the Autoloader.
So change to something like:
os_template/
├── classes
│ └── ostemplateobserver.php
├── db
│ └── events.php
└── version.php
events.php:
defined('MOODLE_INTERNAL') || die();
$observers = array(
array(
'eventname' => '\core\event\user_loggedin',
'callback' => '\local_ostemplate\ostemplateobserver::user_loggedin',
),
array(
'eventname' => '\core\event\user_loggedout',
'callback' => '\local_ostemplate\ostemplateobserver::user_loggedin',
),
);
ostemplateobserver.php:
namespace local_ostemplate;
class ostemplateobserver {
public static function user_loggedin(core\event\base $event) {
file_put_contents("test.txt","User Logged in");
}
}