add custom runtime gae flex stuff

Author: jdpedrie

cloud_sql/sqlserver/pdo/Dockerfile

@@ -0,0 +1,21 @@
+FROM gcr.io/google_appengine/php72
+
+COPY --from=composer:latest /usr/bin/composer /usr/local/bin/composer
+
+COPY . .
+
+RUN curl https://packages.microsoft.com/keys/microsoft.asc | apt-key add - && \
+    curl https://packages.microsoft.com/config/ubuntu/16.04/prod.list > /etc/apt/sources.list.d/mssql-release.list
+
+RUN apt-get update && \
+    ACCEPT_EULA=Y apt-get -y install \
+        autoconf \
+        build-essential \
+        msodbcsql17 \
+        unixodbc-dev \
+        unzip
+
+RUN pecl install pdo_sqlsrv
+RUN echo "extension=pdo_sqlsrv.so" > /opt/php72/lib/ext.enabled/ext-pdo_sqlsrv.ini
+# RUN phpenmod pdo_sqlsrv
+RUN composer update

cloud_sql/sqlserver/pdo/README.md

@@ -55,14 +55,18 @@ $ 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.
 
+In order to use the `sqlsrv` extension, you will need to build a [custom runtime](https://cloud.google.com/appengine/docs/flexible/custom-runtimes/quickstart). The `Dockerfile` in this sample contains a simple example of a custom PHP 7.2 runtime based off of the default App Engine Flex image with the `pdo_sqlsrv` extension installed.
+
+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/sqlserver/pdo/app.yaml

@@ -12,7 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-runtime: php72
+runtime: custom
+env: flex
 
 # Remember - storing secrets in plaintext is potentially unsafe. Consider using
 # something like https://cloud.google.com/secret-manager/ to help keep secrets
@@ -23,6 +24,12 @@ env_variables:
   DB_NAME: my-db
   DB_HOSTNAME: "172.17.0.1"
 
+beta_settings:
+  # The connection name of your instance, available by using
+  # 'gcloud beta sql instances describe [INSTANCE_NAME]' or from
+  # the Instance details page in the Google Cloud Platform Console.
+  cloud_sql_instances: ::=tcp:1433
+
 # 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").

cloud_sql/sqlserver/pdo/composer.json

@@ -12,6 +12,7 @@
     },
     "require": {
         "php": ">= 7.2",
+        "ext-pdo_sqlsrv": "*",
         "slim/slim": "^4.5",
         "slim/twig-view": "^3.1",
         "pimple/pimple": "^3.3",