adds flex logging sample (GoogleCloudPlatform#281)

Author: bshaffer

appengine/flexible/logging/README.md

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+# Logging and Google App Engine Flexible
+
+This sample application demonstrates how to implement logging from
+ Google App Engine Flexible Environment.
+
+## Register your application
+
+- Go to
+  [Google Developers Console](https://console.developers.google.com/project)
+  and create a new project. This will automatically enable an App
+  Engine application with the same ID as the project.
+
+## Prerequisites
+
+- Install [`composer`](https://getcomposer.org)
+- Install dependencies by running:
+
+    ```sh
+    $ composer install
+    ```
+
+## Deploy to App Engine
+
+**Prerequisites**
+
+- Install the [Google Cloud SDK](https://developers.google.com/cloud/sdk/).
+
+**Deploy with gcloud**
+
+```
+$ gcloud config set project YOUR_PROJECT_ID
+$ gcloud app deploy
+```
+
+## Run Locally
+
+- Go to "Credentials" and create a new Service Account.
+
+- Select "Generate new JSON key", then download a new JSON file.
+
+- Set the following environment variables:
+
+  - `GOOGLE_APPLICATION_CREDENTIALS`: the file path to the downloaded JSON file.
+  - `GCLOUD_PROJECT`: Your project ID
+
+- Run `php -S localhost:8000` and go to http://localhost:8000 in your browser.

appengine/flexible/logging/app.php

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+<?php
+/**
+ * Copyright 2015 Google Inc.
+ *
+ * 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.
+ */
+
+use Google\Cloud\Logger\AppEngineFlexHandler;
+use Google\Cloud\Logging\LoggingClient;
+use Silex\Application;
+use Silex\Provider\MonologServiceProvider;
+use Silex\Provider\TwigServiceProvider;
+use Symfony\Component\HttpFoundation\Request;
+
+// create the Silex application
+$app = new Application();
+$app['project_id'] = getenv('GCLOUD_PROJECT');
+// register twig
+$app->register(new TwigServiceProvider(), [
+    'twig.path' => __DIR__
+]);
+
+$app->get('/', function () use ($app) {
+    if (empty($app['project_id'])) {
+        return 'Set the GCLOUD_PROJECT environment variable to run locally';
+    }
+    $projectId = $app['project_id'];
+    # [START list_entries]
+    $logging = new LoggingClient([
+        'projectId' => $projectId
+    ]);
+    $logger = $logging->logger('logging-sample');
+    $logs = $logger->entries([
+        'pageSize' => 10,
+        'orderBy' => 'timestamp desc'
+    ]);
+    # [END list_entries]
+    return $app['twig']->render('index.html.twig', ['logs' => $logs]);
+});
+
+$app->post('/log', function (Request $request) use ($app) {
+    $projectId = $app['project_id'];
+    $text = $request->get('text');
+    # [START write_log]
+    $logging = new LoggingClient([
+        'projectId' => $projectId
+    ]);
+    $logger = $logging->psrLogger('logging-sample');
+    $logger->notice($text);
+    # [END write_log]
+    return $app->redirect('/');
+});
+
+// add AppEngineFlexHandler on prod
+$app->register(new MonologServiceProvider());
+if (isset($_SERVER['GAE_VM']) && $_SERVER['GAE_VM'] === 'true') {
+    $app['monolog.handler'] = new AppEngineFlexHandler();
+}
+
+return $app;

appengine/flexible/logging/app.yaml

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+runtime: php
+env: flex

appengine/flexible/logging/composer.json

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+{
+    "require": {
+        "google/cloud": "^0.20",
+        "silex/silex": "^2.0",
+        "twig/twig": "^1.29"
+    },
+    "require-dev": {
+        "symfony/browser-kit": "^3.2",
+        "google/cloud-tools": "^0.6.1"
+    }
+}