feat(functions): add custom extension sample

functions/concepts_build_extension/.gitignore

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+# Files from phpize
+ext/Makefile.global
+ext/acinclude.m4
+ext/aclocal.m4
+ext/autom4te.cache/
+ext/config.guess
+ext/config.h.in
+ext/config.sub
+ext/configure
+ext/configure.ac
+ext/install-sh
+ext/ltmain.sh
+ext/missing
+ext/mkinstalldirs
+ext/run-tests.php
+
+# Files from ./configure
+ext/Makefile
+ext/Makefile.fragments
+ext/Makefile.objects
+ext/config.h
+ext/config.log
+ext/config.nice
+ext/config.status
+ext/libtool
+
+# Files from make
+ext/.libs/
+ext/modules/
+ext/my_custom_extension.la
+ext/my_custom_extension.lo
+
+# The custom PHP extension
+my_custom_extension.so
+

functions/concepts_build_extension/composer.json

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+{
+    "require": {
+        "google/cloud-functions-framework": "^0.7.1"
+    },
+    "scripts": {
+        "gcp-build": "cd ext && phpize --clean && phpize && ./configure && make && cp modules/my_custom_extension.so ..",
+        "start": [
+           "@gcp-build",
+           "Composer\\Config::disableProcessTimeout",
+           "FUNCTION_TARGET=helloBuildExtension php -d 'extension=./my_custom_extension.so' -S localhost:${PORT:-8080} vendor/bin/router.php"
+        ]
+    }
+}

functions/concepts_build_extension/ext/config.m4

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+PHP_ARG_ENABLE(my_custom_extension, Whether to enable the MyCustomExtension extension, [ --enable-my-custom-extension Enable MyCustomExtension])
+
+if test "$MY_CUSTOM_EXTENSION" != "no"; then
+    PHP_NEW_EXTENSION(my_custom_extension, my_custom_extension.c, $ext_shared)
+fi

functions/concepts_build_extension/ext/my_custom_extension.c

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+// include the PHP API itself
+#include <php.h>
+// include the extension header
+#include "my_custom_extension.h"
+
+// register the "helloworld_from_extension" function to the PHP API
+zend_function_entry my_custom_extension_functions[] = {
+    PHP_FE(helloworld_from_extension, NULL)
+    {NULL, NULL, NULL}
+};
+
+// some information about our module
+zend_module_entry my_custom_extension_module_entry = {
+    STANDARD_MODULE_HEADER,
+    PHP_MY_CUSTOM_EXTENSION_EXTNAME,
+    my_custom_extension_functions,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    PHP_MY_CUSTOM_EXTENSION_VERSION,
+    STANDARD_MODULE_PROPERTIES
+};
+
+// use a macro to output additional C code, to make ext dynamically loadable
+ZEND_GET_MODULE(my_custom_extension)
+
+// Implement our "Hello World" function, which returns a string
+PHP_FUNCTION(helloworld_from_extension) {
+    zval val;
+    ZVAL_STRING(&val, "Hello World! (from my_custom_extension.so)\n");
+    RETURN_STR(Z_STR(val));
+}

functions/concepts_build_extension/ext/my_custom_extension.h

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+// module constants
+#define PHP_MY_CUSTOM_EXTENSION_EXTNAME "my_custom_extension"
+#define PHP_MY_CUSTOM_EXTENSION_VERSION "0.0.1"
+
+// the function to be exported
+PHP_FUNCTION(helloworld_from_extension);

functions/concepts_build_extension/index.php

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+<?php
+/**
+ * Copyright 2021 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.
+ */
+
+/**
+ * To use this, set the following environment variables:
+ *   FUNCTION_TARGET=helloHttp
+ *   FUNCTION_EVENT_TYPE=http
+ */
+
+use Psr\Http\Message\ServerRequestInterface;
+
+function helloBuildExtension(ServerRequestInterface $request)
+{
+    return helloworld_from_extension();
+}

functions/concepts_build_extension/php.ini

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+;enable our custom extension
+extension=/workspace/my_custom_extension.so

functions/concepts_build_extension/phpunit.xml.dist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Copyright 2021 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.
+-->
+<phpunit bootstrap="../../testing/bootstrap.php" convertWarningsToExceptions="false">
+    <testsuites>
+        <testsuite name="Cloud Functions Build Step Test Suite">
+            <directory>test</directory>
+        </testsuite>
+    </testsuites>
+    <logging>
+        <log type="coverage-clover" target="build/logs/clover.xml"/>
+    </logging>
+    <filter>
+        <whitelist>
+            <directory suffix=".php">.</directory>
+            <exclude>
+              <directory>./vendor</directory>
+            </exclude>
+        </whitelist>
+    </filter>
+</phpunit>

functions/concepts_build_extension/test/DeployTest.php

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+<?php
+/**
+ * Copyright 2021 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);
+
+namespace Google\Cloud\Samples\Functions\ConceptsBuildExtension\Test;
+
+use Google\Cloud\TestUtils\CloudFunctionDeploymentTrait;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Class DeployTest.
+ *
+ * This test is not run by the CI system.
+ *
+ * To skip deployment of a new function, run with "GOOGLE_SKIP_DEPLOYMENT=true".
+ * To skip deletion of the tested function, run with "GOOGLE_KEEP_DEPLOYMENT=true".
+ * @group deploy
+ */
+class DeployTest extends TestCase
+{
+    use CloudFunctionDeploymentTrait;
+
+    private static $entryPoint = 'helloBuildExtension';
+
+    public function testFunction(): void
+    {
+        // Send a request to the function.
+        $resp = $this->client->get('', [
+            // Uncomment and CURLOPT_VERBOSE debug content will be sent to stdout.
+            // 'debug' => true
+        ]);
+
+        // Assert status code.
+        $this->assertEquals('200', $resp->getStatusCode());
+
+        // Assert function output.
+        $output = trim((string) $resp->getBody());
+        // Failures often lead to a large HTML page in the response body.
+        $this->assertEquals(
+            'Hello World! (from my_custom_extension.so)',
+            $output
+        );
+    }
+}

functions/concepts_build_extension/test/SystemTest.php

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+<?php
+/**
+ * Copyright 2021 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);
+
+namespace Google\Cloud\Samples\Functions\ConceptsBuildExtension\Test;
+
+use PHPUnit\Framework\TestCase;
+use Google\Cloud\TestUtils\CloudFunctionLocalTestTrait;
+use Google\Cloud\TestUtils\GcloudWrapper\CloudFunction;
+use Google\Cloud\Utils\ExponentialBackoff;
+use Symfony\Component\Process\Process;
+use Symfony\Component\Process\PhpExecutableFinder;
+
+/**
+ * Class SystemTest.
+ */
+class SystemTest extends TestCase
+{
+    use CloudFunctionLocalTestTrait;
+
+    private static $entryPoint = 'helloBuildExtension';
+
+    public function testFunction(): void
+    {
+        // Send a request to the function.
+        $resp = $this->client->get('/');
+
+        // Assert status code.
+        $this->assertEquals('200', $resp->getStatusCode());
+
+        // Assert function output.
+        $output = trim((string) $resp->getBody());
+        $this->assertEquals(
+            'Hello World! (from my_custom_extension.so)',
+            $output
+        );
+    }
+
+    /**
+     * Start the development server based on the prepared function.
+     *
+     * We override this to run the "gcp-build" step and to enable the built
+     * extension when running the PHP build-in-web server.
+     */
+    private static function doRun()
+    {
+        // Build the extension
+        $process = new Process(['composer', 'run-script', 'gcp-build']);
+        $process->start();
+
+        $backoff = new ExponentialBackoff($retries = 10);
+        $backoff->execute(function () use ($process) {
+            if ($process->isRunning()) {
+                throw new \Exception('waiting for "gcp-build" step to complete');
+            }
+        });
+
+        $phpBin = (new PhpExecutableFinder())->find();
+        $phpBin .= ' -d extension=\'./my_custom_extension.so\'';
+        return self::$fn->run([], CloudFunction::DEFAULT_PORT, $phpBin);
+    }
+}