feat: refactor postgres sample to use slim app

Author: jdpedrie

cloud_sql/postgres/pdo/README.md

@@ -2,35 +2,62 @@
 
 ## Before you begin
 
-1. Before you use this code sample, you need to have [Composer](https://getcomposer.org/) installed or downloaded into this folder. Download instructions can be found [here](https://getcomposer.org/download/).
+1. Before you use this code sample, you need to have [Composer](https://getcomposer.org/) installed or downloaded into this folder. Download instructions can be found [here](https://getcomposer.org/download/). Once you've installed composer, use it to install required dependencies by running `composer install`.
 2. Create a PostgreSQL Cloud SQL Instance by following these [instructions](https://cloud.google.com/sql/docs/postgres/create-instance). Note the connection string, database user, and database password that you create.
 3. Create a database for your application by following these [instructions](https://cloud.google.com/sql/docs/postgres/create-manage-databases). Note the database name.
 4. Create a service account with the 'Cloud SQL Client' permissions by following these [instructions](https://cloud.google.com/sql/docs/postgres/connect-external-app#4_if_required_by_your_authentication_method_create_a_service_account). Download a JSON key to use to authenticate your connection.
-5. Use the information noted in the previous steps:
+
+## Running Locally
+
+To run this application locally, download and install the `cloud_sql_proxy` by following the instructions [here](https://cloud.google.com/sql/docs/postgres/sql-proxy#install).
+
+To authenticate with Cloud SQL, set the `$GOOGLE_APPLICATION_CREDENTIALS` environment variable:
 
 ```bash
 export GOOGLE_APPLICATION_CREDENTIALS=/path/to/service/account/key.json
-export CLOUD_SQL_CONNECTION_NAME='::'
-export DB_USER='my-db-user'
-export DB_PASS='my-db-pass'
-export DB_NAME='my-db-name'
-export DB_HOSTNAME='localhost' # If connecting using TCP instead of Unix Sockets
 ```
 
-Note: Saving credentials in environment variables is convenient, but not secure - consider a more secure solution such as [Cloud KMS](https://cloud.google.com/kms/) to help keep secrets safe.
+To run the Cloud SQL proxy, you need to set the instance connection name. See the instructions [here](https://cloud.google.com/sql/docs/postgres/quickstart-proxy-test#get_the_instance_connection_name) for finding the instance connection name.
 
-## Running Locally
+```bash
+export CLOUD_SQL_CONNECTION_NAME='::'
+```
 
-To run this application locally, download and install the `cloud_sql_proxy` by following the instructions [here](https://cloud.google.com/sql/docs/postgres/sql-proxy#install).
+Once the proxy is ready, use one of the following commands to start the proxy in the background.
+
+You may connect to your instance via either unix sockets or TCP. To connect using a socket, you must provide the `-dir` option when starting the proxy. To connect via TCP, you must provide a port as part of the instance name. Both are demonstrated below.
 
-Once the proxy is ready, use the following command to start the proxy in the background:
+### Unix Socket mode
 
 ```bash
-$ ./cloud_sql_proxy -dir=/cloudsql --instances=$CLOUD_SQL_CONNECTION_NAME --credential_file=$GOOGLE_APPLICATION_CREDENTIALS
+$ ./cloud_sql_proxy -dir=/cloudsql \
+    --instances=$CLOUD_SQL_CONNECTION_NAME \
+    --credential_file=$GOOGLE_APPLICATION_CREDENTIALS
 ```
 
 Note: Make sure to run the command under a user with write access in the `/cloudsql` directory. This proxy will use this folder to create a unix socket the application will use to connect to Cloud SQL.
 
+### TCP mode
+
+```bash
+$ ./cloud_sql_proxy \
+    --instances=$CLOUD_SQL_CONNECTION_NAME=tcp:5432 \
+    --credential_file=$GOOGLE_APPLICATION_CREDENTIALS
+```
+
+### Set Configuration Values
+
+Set the required environment variables for your connection to Cloud SQL. If you are using TCP mode as described above, do not set the `CLOUD_SQL_CONNECTION_NAME` variable.
+
+```bash
+export DB_USER='my-db-user'
+export DB_PASS='my-db-pass'
+export DB_NAME='my-db-name'
+export DB_HOSTNAME='localhost'
+```
+
+Note: Saving credentials in environment variables is convenient, but not secure - consider a more secure solution such as [Secret Manager](https://cloud.google.com/secret-manager/) to help keep secrets safe.
+
 Execute the following:
 
 ```bash
@@ -39,15 +66,16 @@ $ php -S localhost:8080
 
 Navigate towards http://localhost:8080 to verify your application is running correctly.
 
-## Google App Engine Standard
+## Google App Engine Flex
 
-To run on GAE-Standard, create an App Engine project by following the setup for these [instructions](https://cloud.google.com/appengine/docs/standard/php7/quickstart#before-you-begin).
+To run on App Engine Flex, create an App Engine project by following the setup for these [instructions](https://cloud.google.com/appengine/docs/standard/php7/quickstart#before-you-begin).
 
 First, update `app.yaml` with the correct values to pass the environment variables into the runtime.
 
+Then, make sure that the service account `service-{PROJECT_NUMBER}>@gae-api-prod.google.com.iam.gserviceaccount.com` has the IAM role `Cloud SQL Client`.
+
 Next, the following command will deploy the application to your Google Cloud project:
 
 ```bash
-$ gcloud app deploy
+$ gcloud beta app deploy
 ```
-

cloud_sql/postgres/pdo/app.yaml

@@ -1,4 +1,4 @@
-# Copyright 2018 Google LLC
+# 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.
@@ -12,18 +12,26 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-runtime: php72
+runtime: php
+env: flex
 
 # Remember - storing secrets in plaintext is potentially unsafe. Consider using
-# something like https://cloud.google.com/kms/ to help keep secrets secret.
+# something like https://cloud.google.com/secret-manager/ to help keep secrets
+# secret.
 env_variables:
-  CLOUD_SQL_CONNECTION_NAME: ::
+  CLOUD_SQL_CONNECTION_NAME: "::"
   DB_USER: my-db-user
   DB_PASS: my-db-pass
-  DB_NAME: my_db
+  DB_NAME: my-db
+
+beta_settings:
+  cloud_sql_instances: "::"
+
+runtime_config:
+  document_root: .
 
 # Defaults to "serve index.php" and "serve public/index.php". Can be used to
 # serve a custom PHP front controller (e.g. "serve backend/index.php") or to
 # run a long-running PHP script as a worker process (e.g. "php worker.php").
 #
-# entrypoint: serve index.php
+# entrypoint: serve index.php

cloud_sql/postgres/pdo/composer.json

@@ -0,0 +1,24 @@
+{
+    "name": "google/cloud-sql-postgres-example",
+    "autoload": {
+        "psr-4": {
+            "Google\\Cloud\\Samples\\CloudSQL\\Postgres\\": "src"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Google\\Cloud\\Samples\\CloudSQL\\Postgres\\Tests\\": "src"
+        }
+    },
+    "require": {
+        "php": ">= 7.2",
+        "slim/slim": "^4.5",
+        "slim/twig-view": "^3.1",
+        "pimple/pimple": "^3.3",
+        "guzzlehttp/psr7": "^1.6",
+        "http-interop/http-factory-guzzle": "^1.0"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^8.5"
+    }
+}

cloud_sql/postgres/pdo/index.php

@@ -1,40 +1,54 @@
 
-# Copyright 2018 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.
-
-require_once 'src/DB.php';
-require_once 'src/Votes.php';
-
-use Google\Cloud\Samples\CloudSQL\Postgres\DB;
-use Google\Cloud\Samples\CloudSQL\Postgres\Votes;
-
-$votes = new Votes(DB::createPdoConnection());
-
-if ($_SERVER['REQUEST_URI'] == '/' && $_SERVER['REQUEST_METHOD'] == 'GET') {
-    $list = $votes->list();
-
-    $vote_count = $votes->count_candidates();
-    $tab_count = $vote_count['tabs'];
-    $space_count = $vote_count['spaces'];
-
-    include_once("./template.php");
-} elseif ($_SERVER['REQUEST_URI'] == '/' && $_SERVER['REQUEST_METHOD'] == 'POST') {
+/*
+ * Copyright 2020 Google LLC.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+declare(strict_types=1);
+
+use GuzzleHttp\Psr7;
+
+include __DIR__ . '/vendor/autoload.php';
+
+$app = include __DIR__ . '/src/app.php';
+
+$app->get('/', function ($request, $response) {
+    $this->get('votes')->createTableIfNotExists();
+
+    return $this->get('view')->render($response, 'template.twig', [
+        'votes' => $this->get('votes')->listVotes(),
+        'tabCount' => $this->get('votes')->getCountByValue('TABS'),
+        'spaceCount' => $this->get('votes')->getCountByValue('SPACES'),
+    ]);
+});
+
+$app->post('/', function ($request, $response) {
+    $this->get('votes')->createTableIfNotExists();
+
     $message = 'Invalid vote. Choose Between TABS and SPACES';
 
-    if (!empty($_POST['team']) && in_array($_POST['team'], ['SPACES', 'TABS'])) {
-        $message = $votes->save($_POST['team']);
+    $formData = $request->getParsedBody() + [
+        'voteValue' => ''
+    ];
+
+    if (in_array($formData['voteValue'], ['SPACES', 'TABS'])) {
+        $message = $this->get('votes')->insertVote($formData['voteValue'])
+            ? 'Vote cast for ' . $formData['voteValue']
+            : 'An error occurred';
     }
 
-    echo $message;
-}
+    return $response->withBody(Psr7\stream_for($message));
+});
+
+$app->run();

cloud_sql/postgres/pdo/phpunit.xml.dist

@@ -0,0 +1,13 @@
+xml version="1.0" encoding="UTF-8"?>
+<phpunit colors="true">
+  <testsuites>
+    <testsuite name="CloudSQLPostgresSample">
+      <directory>testsdirectory>
+    testsuite>
+  testsuites>
+  <filter>
+    <whitelist>
+      <directory suffix=".php">srcdirectory>
+    whitelist>
+  filter>
+phpunit>