app.php

<?php
/*
 * Copyright 2020 Google LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

declare(strict_types=1);

use Google\Cloud\Samples\CloudSQL\Postgres\DatabaseTcp;
use Google\Cloud\Samples\CloudSQL\Postgres\DatabaseUnix;
use Google\Cloud\Samples\CloudSQL\Postgres\Votes;
use Pimple\Container;
use Pimple\Psr11\Container as Psr11Container;
use Slim\Factory\AppFactory;
use Slim\Views\Twig;
use Slim\Views\TwigMiddleware;

// Create and set the dependency injection container.
$container = new Container();
AppFactory::setContainer(new Psr11Container($container));

// add the votes manager to the container.
$container['votes'] = function (Container $container) {
    return new Votes($container['db']);
};

// Setup the database connection in the container.
$container['db'] = function () {
    if (getenv('DB_USER') === false) {
        throw new RuntimeException(
            'Must supply $DB_USER environment variables'
        );
    }
    if (getenv('DB_PASS') === false) {
        throw new RuntimeException(
            'Must supply $DB_PASS environment variables'
        );
    }
    if (getenv('DB_NAME') === false) {
        throw new RuntimeException(
            'Must supply $DB_NAME environment variables'
        );
    }

    if ($instanceHost = getenv('INSTANCE_HOST')) {
        return DatabaseTcp::initTcpDatabaseConnection();
    } elseif ($instanceUnixSocket = getenv('INSTANCE_UNIX_SOCKET')) {
        return DatabaseUnix::initUnixDatabaseConnection();
    } else {
        throw new RuntimeException(
            'Missing database connection type. ' .
                'Please define $INSTANCE_HOST or $INSTANCE_UNIX_SOCKET'
        );
    }
};

// Configure the templating engine.
$container['view'] = function () {
    return Twig::create(__DIR__ . '/../views');
};

// Create the application.
$app = AppFactory::create();

// Add the twig middleware
$app->add(TwigMiddleware::createFromContainer($app));

// Setup error handlinmg
$app->addErrorMiddleware(true, false, false);

return $app;