public function createCounterIfNotExists($key)
{
try {
$this->client->UpdateItem(['TableName' => 'tr_counters', 'Key' => ['counter_key' => ['S' => $key]], 'UpdateExpression' => 'SET v = :val', 'ExpressionAttributeValues' => [':val' => ['N' => 0]], 'ConditionExpression' => 'attribute_not_exists (v)']);
} catch (DynamoDbException $e) {
if ($e->getAwsErrorCode() === 'ConditionalCheckFailedException') {
}
// TODO
}
}
