function testExceptionIsThrownInHashIterator()
{
$this->setExpectedException('DomainException', 'Callback exception');
F\sort($this->hashIterator, array($this, 'exception'));
}
public function handle()
{
$this->info('Initializing Leader Selection...');
// Only do cron setup if environment is configured to use it (This way we don't accidentally run on workers)
if (getenv('USE_CRON') == 'true') {
//check to see if we are in an instance
$ch = curl_init('http://169.254.169.254/latest/meta-data/instance-id');
//magic ip from AWS
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
if ($result = curl_exec($ch)) {
$this->info('Instance ID: ' . $result);
// Get this instance metadata so we can find the environment it's running in
$tags = $info = $this->ecClient->describeInstances(['Filters' => [['Name' => 'instance-id', 'Values' => [$result]]]])->get('Reservations')[0]['Instances'][0]['Tags'];
// Get environment name
$environmentName = F\first($tags, function ($tagArray) {
return $tagArray['Key'] == 'elasticbeanstalk:environment-name';
})['Value'];
$this->info('Environment: ' . $environmentName);
$this->info('Getting Instances with Environment: ' . $environmentName);
// Get instances that have this environment tagged
$info = $this->ecClient->describeInstances(['Filters' => [['Name' => 'tag-value', 'Values' => [$environmentName]]]]);
$instances = F\map($info->get('Reservations'), function ($i) {
return current($i['Instances']);
});
$this->info('Getting potential instances...');
// Only want instances that are running
$candidateInstances = F\select($instances, function ($instanceMeta) {
return $instanceMeta['State']['Code'] == 16;
});
$leader = false;
if (!empty($candidateInstances)) {
//there are instances running
if (count($candidateInstances) > 1) {
// if there is more than one we sort by launch time and get the oldest
$this->info('More than one instance running, finding the oldest...');
$oldestInstance = F\sort($candidateInstances, function ($left, $right) {
return $left['LaunchTime'] > $right['LaunchTime'];
})[0];
} else {
$this->info('Only one instance running...');
$oldestInstance = reset($candidateInstances);
}
if ($oldestInstance['InstanceId'] == $result) {
// if this instance is the oldest instance it's the leader
$leader = true;
}
} else {
$this->info('No candidate instances found. \'O Brave New World!');
$leader = true;
}
// No leader is running so we'll setup this one as the leader
// and create a cron entry to run the scheduler
if ($leader) {
$this->info('We are the Leader! Initiating Cron Setup');
$this->call('system:start:cron');
} else {
// Instance was found, don't do any cron stuff
$this->info('We are not a leader instance :( Maybe next time...');
$this->info('Leader should be running on Instance ' . $leader['InstanceId']);
}
$this->info('Leader Selection Done!');
} else {
// Probably be run from your local machine
$this->error('Did not detect an ec2 environment. Exiting.');
}
} else {
$this->info('USE_CRON env var not set. Exiting.');
}
}
