Provide an "isolated" database connection for testing

Summary:
This provides a new connection which doesn't connect to
anything, so effects can be isolated to the current process (for
unit testing).

Test Plan:
Ran unit tests.

Reviewed By: aran
Reviewers: aran, tuomaspelkonen, jungejason
CC: aran, epriestley
Differential Revision: 193

src/__phutil_library_map__.php

@@ -39,6 +39,8 @@ phutil_register_library_map(array(
     'AphrontFormView' => 'view/form/base',
     'AphrontHeadsupActionListView' => 'view/layout/headsup/actionlist',
     'AphrontHeadsupActionView' => 'view/layout/headsup/action',
+    'AphrontIsolatedDatabaseConnection' => 'storage/connection/isolated',
+    'AphrontIsolatedDatabaseConnectionTestCase' => 'storage/connection/isolated/__tests__',
     'AphrontListFilterView' => 'view/layout/listfilter',
     'AphrontMySQLDatabaseConnection' => 'storage/connection/mysql',
     'AphrontNullView' => 'view/null',
@@ -416,6 +418,7 @@ phutil_register_library_map(array(
     'PhabricatorStandardPageView' => 'view/page/standard',
     'PhabricatorStatusController' => 'applications/status/base',
     'PhabricatorTaskmasterDaemon' => 'infrastructure/daemon/workers/taskmaster',
+    'PhabricatorTestCase' => 'infrastructure/testing/testcase',
     'PhabricatorTimelineCursor' => 'infrastructure/daemon/timeline/storage/cursor',
     'PhabricatorTimelineDAO' => 'infrastructure/daemon/timeline/storage/base',
     'PhabricatorTimelineEvent' => 'infrastructure/daemon/timeline/storage/event',
@@ -504,6 +507,8 @@ phutil_register_library_map(array(
     'AphrontFormView' => 'AphrontView',
     'AphrontHeadsupActionListView' => 'AphrontView',
     'AphrontHeadsupActionView' => 'AphrontView',
+    'AphrontIsolatedDatabaseConnection' => 'AphrontDatabaseConnection',
+    'AphrontIsolatedDatabaseConnectionTestCase' => 'PhabricatorTestCase',
     'AphrontListFilterView' => 'AphrontView',
     'AphrontMySQLDatabaseConnection' => 'AphrontDatabaseConnection',
     'AphrontNullView' => 'AphrontView',
@@ -795,6 +800,7 @@ phutil_register_library_map(array(
     'PhabricatorStandardPageView' => 'AphrontPageView',
     'PhabricatorStatusController' => 'PhabricatorController',
     'PhabricatorTaskmasterDaemon' => 'PhabricatorDaemon',
+    'PhabricatorTestCase' => 'ArcanistPhutilTestCase',
     'PhabricatorTimelineCursor' => 'PhabricatorTimelineDAO',
     'PhabricatorTimelineDAO' => 'PhabricatorLiskDAO',
     'PhabricatorTimelineEvent' => 'PhabricatorTimelineDAO',

src/infrastructure/testing/testcase/PhabricatorTestCase.php

@@ -0,0 +1,26 @@
+<?php
+
+/*
+ * Copyright 2011 Facebook, 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.
+ */
+
+abstract class PhabricatorTestCase extends ArcanistPhutilTestCase {
+
+  protected function willRunTests() {
+    $root = dirname(phutil_get_library_root('phabricator'));
+    require_once $root.'/scripts/__init_env__.php';
+  }
+
+}

src/infrastructure/testing/testcase/__init__.php

@@ -0,0 +1,14 @@
+<?php
+/**
+ * This file is automatically generated. Lint this module to rebuild it.
+ * @generated
+ */
+
+
+
+phutil_require_module('arcanist', 'unit/engine/phutil/testcase');
+
+phutil_require_module('phutil', 'moduleutils');
+
+
+phutil_require_source('PhabricatorTestCase.php');

src/storage/connection/isolated/AphrontIsolatedDatabaseConnection.php

@@ -0,0 +1,90 @@
+<?php
+
+/*
+ * Copyright 2011 Facebook, 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.
+ */
+
+/**
+ * @group storage
+ */
+class AphrontIsolatedDatabaseConnection extends AphrontDatabaseConnection {
+
+  private $configuration;
+  private static $nextInsertID;
+  private $insertID;
+
+  public function __construct(array $configuration) {
+    $this->configuration = $configuration;
+
+    if (self::$nextInsertID === null) {
+      // Generate test IDs into a distant ID space to reduce the risk of
+      // collisions and make them distinctive.
+      self::$nextInsertID = 55555000000 + mt_rand(0, 1000);
+    }
+  }
+
+  public function escapeString($string) {
+    return '<S>';
+  }
+
+  public function escapeColumnName($name) {
+    return '<C>';
+  }
+
+  public function escapeMultilineComment($comment) {
+    return '<K>';
+  }
+
+  public function escapeStringForLikeClause($value) {
+    return '<L>';
+  }
+
+  private function getConfiguration($key, $default = null) {
+    return idx($this->configuration, $key, $default);
+  }
+
+  public function getInsertID() {
+    return $this->insertID;
+  }
+
+  public function getAffectedRows() {
+    return $this->affectedRows;
+  }
+
+  public function getTransactionKey() {
+    return 'xaction'; // TODO, probably need to stub this better.
+  }
+
+  public function selectAllResults() {
+    return $this->allResults;
+  }
+
+  public function executeRawQuery($raw_query) {
+
+    // NOTE: This method is intentionally simplified for now, since we're only
+    // using it to stub out inserts/updates. In the future it will probably need
+    // to grow more powerful.
+
+    $this->allResults = array();
+
+    // NOTE: We jitter the insert IDs to keep tests honest; a test should cover
+    // the relationship between objects, not their exact insertion order. This
+    // guarantees that IDs are unique but makes it impossible to hard-code tests
+    // against this specific implementation detail.
+    $this->insertID = (self::$nextInsertID += mt_rand(1, 10));
+    $this->affectedRows = 1;
+  }
+
+}

src/storage/connection/isolated/__init__.php

@@ -0,0 +1,14 @@
+<?php
+/**
+ * This file is automatically generated. Lint this module to rebuild it.
+ * @generated
+ */
+
+
+
+phutil_require_module('phabricator', 'storage/connection/base');
+
+phutil_require_module('phutil', 'utils');
+
+
+phutil_require_source('AphrontIsolatedDatabaseConnection.php');

src/storage/connection/isolated/__tests__/AphrontIsolatedDatabaseConnectionTestCase.php

@@ -0,0 +1,65 @@
+<?php
+
+/*
+ * Copyright 2011 Facebook, 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.
+ */
+
+class AphrontIsolatedDatabaseConnectionTestCase
+  extends PhabricatorTestCase {
+
+  public function testIsolation() {
+    $conn = $this->newIsolatedConnection();
+
+    $test_phid = 'PHID-TEST-'.sha1(mt_rand());
+
+    queryfx(
+      $conn,
+      'INSERT INTO phabricator_phid.phid (phid) VALUES (%s)',
+      $test_phid);
+
+    try {
+      $real_phid = id(new PhabricatorPHID())->loadOneWhere(
+        'phid = %s',
+        $test_phid);
+      $this->assertEqual(
+        null,
+        $real_phid,
+        'Expect fake PHID to exist only in isolation.');
+    } catch (AphrontQueryConnectionException $ex) {
+      // If we can't connect to the database, conclude that the isolated
+      // connection actually is isolated. Philosophically, this perhaps allows
+      // us to claim this test does not depend on the database?
+    }
+  }
+
+  public function testInsertGeneratesID() {
+    $conn = $this->newIsolatedConnection();
+
+    queryfx($conn, 'INSERT');
+    $id1 = $conn->getInsertID();
+
+    queryfx($conn, 'INSERT');
+    $id2 = $conn->getInsertID();
+
+    $this->assertEqual(true, (bool)$id1, 'ID1 exists.');
+    $this->assertEqual(true, (bool)$id2, 'ID2 exists.');
+    $this->assertEqual(true, $id1 != $id2, 'IDs are distinct.');
+  }
+
+  private function newIsolatedConnection() {
+    $config = array();
+    return new AphrontIsolatedDatabaseConnection($config);
+  }
+}

src/storage/connection/isolated/__tests__/__init__.php

@@ -0,0 +1,17 @@
+<?php
+/**
+ * This file is automatically generated. Lint this module to rebuild it.
+ * @generated
+ */
+
+
+
+phutil_require_module('phabricator', 'applications/phid/storage/phid');
+phutil_require_module('phabricator', 'infrastructure/testing/testcase');
+phutil_require_module('phabricator', 'storage/connection/isolated');
+phutil_require_module('phabricator', 'storage/queryfx');
+
+phutil_require_module('phutil', 'utils');
+
+
+phutil_require_source('AphrontIsolatedDatabaseConnectionTestCase.php');