feat(spanner): add create instance sample

spanner/README.md

@@ -99,6 +99,7 @@ To run the Spanner Samples:
       add-timestamp-column                 Adds a commit timestamp column to a table.
       batch-query-data                     Batch queries sample data from the database using SQL.
       create-database                      Creates a database and tables for sample data.
+      create-instance                      Creates an instance.
       create-index                         Adds a simple index to the example database.
       create-storing-index                 Adds an storing index to the example database.
       create-table-timestamp               Creates a table with a commit timestamp column.

spanner/composer.json

@@ -10,6 +10,7 @@
             "src/read_data.php",
             "src/read_write_transaction.php",
             "src/create_database.php",
+            "src/create_instance.php",
             "src/query_data.php",
             "src/read_data_with_index.php",
             "src/update_data.php",

spanner/spanner.php

@@ -48,6 +48,17 @@
     new InputArgument('backup_id', InputArgument::REQUIRED, 'The backup id'),
 ]);
 
+// Create Instance command
+$application->add((new Command('create-instance'))
+    ->setDefinition($instanceInputDefinition)
+    ->setDescription('Creates an instance.')
+    ->setCode(function ($input, $output) {
+        create_instance(
+            $input->getArgument('instance_id')
+        );
+    })
+);
+
 // Create Database command
 $application->add((new Command('create-database'))
     ->setDefinition($inputDefinition)

spanner/src/create_instance.php

@@ -0,0 +1,61 @@
+<?php
+/**
+ * Copyright 2020 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.
+ */
+
+/**
+ * For instructions on how to run the full sample:
+ *
+ * @see https://github.com/GoogleCloudPlatform/php-docs-samples/tree/master/spanner/README.md
+ */
+
+namespace Google\Cloud\Samples\Spanner;
+
+// [START spanner_create_instance]
+use Google\Cloud\Spanner\SpannerClient;
+
+/**
+ * Creates an instance.
+ * Example:
+ * ```
+ * create_instance($instanceId);
+ * ```
+ *
+ * @param string $instanceId The Spanner instance ID.
+ */
+function create_instance($instanceId)
+{
+    $spanner = new SpannerClient();
+    $instanceConfig = $spanner->instanceConfiguration(
+        'regional-us-central1'
+    );
+    $operation = $spanner->createInstance(
+        $instanceConfig,
+        $instanceId,
+        [
+            'displayName' => 'This is a display name.',
+            'nodeCount' => 1,
+            'labels' => [
+                'cloud_spanner_samples' => true,
+            ]
+        ]
+    );
+
+    print('Waiting for operation to complete...' . PHP_EOL);
+    $operation->pollUntilComplete();
+
+    printf('Created instance %s' . PHP_EOL, $instanceId);
+}
+// [END spanner_create_instance]

spanner/test/spannerTest.php

@@ -57,17 +57,29 @@ public static function setUpBeforeClass()
         if (!extension_loaded('grpc')) {
             self::markTestSkipped('Must enable grpc extension.');
         }
-        self::$instanceId = self::requireEnv('GOOGLE_SPANNER_INSTANCE_ID');
 
         $spanner = new SpannerClient([
             'projectId' => self::$projectId,
         ]);
 
+        self::$instanceId = 'test-' . time() . rand();
         self::$databaseId = 'test-' . time() . rand();
         self::$backupId = 'backup-' . self::$databaseId;
         self::$instance = $spanner->instance(self::$instanceId);
     }
 
+    public function testCreateInstance()
+    {
+        $output = $this->runCommand('create-instance', [
+            'instance_id' => self::$instanceId
+        ]);
+        $this->assertContains('Waiting for operation to complete...', $output);
+        $this->assertContains('Created instance test-', $output);
+    }
+
+    /**
+     * @depends testCreateInstance
+     */
     public function testCreateDatabase()
     {
         $output = $this->runCommand('create-database');
@@ -612,8 +624,11 @@ public function testCreateClientWithQueryOptions()
         });
     }
 
-    private function runCommand($commandName)
+    private function runCommand($commandName, $params = [])
     {
+        if (!empty($params)) {
+            return $this->traitRunCommand($commandName, $params);
+        }
         return $this->traitRunCommand($commandName, [
             'instance_id' => self::$instanceId,
             'database_id' => self::$databaseId,
@@ -626,5 +641,6 @@ public static function tearDownAfterClass()
             $database = self::$instance->database(self::$databaseId);
             $database->drop();
         }
+        self::$instance->delete();
     }
 }