Global Resource Coordinator: Basic service internals

services/resource_coordinator/coordination_unit/coordination_unit_impl_unittest.cc

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <memory>
+#include <vector>
+
+#include "base/bind.h"
+#include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
+#include "services/resource_coordinator/coordination_unit/coordination_unit_provider_impl.h"
+#include "services/service_manager/public/cpp/service_context_ref.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace resource_coordinator {
+
+namespace {
+
+void OnLastServiceRefDestroyed() {
+  // No-op. This is required by service_manager::ServiceContextRefFactory
+  // construction but not needed for the tests.
+}
+
+class CoordinationUnitImplTest : public testing::Test {
+ public:
+  CoordinationUnitImplTest()
+      : service_ref_factory_(base::Bind(&OnLastServiceRefDestroyed)),
+        provider_(&service_ref_factory_) {}
+  ~CoordinationUnitImplTest() override {}
+
+  // testing::Test:
+  void TearDown() override { base::RunLoop().RunUntilIdle(); }
+
+ protected:
+  CoordinationUnitProviderImpl* provider() { return &provider_; }
+
+ private:
+  base::MessageLoop message_loop_;
+
+  service_manager::ServiceContextRefFactory service_ref_factory_;
+  CoordinationUnitProviderImpl provider_;
+};
+
+class TestCoordinationUnit : public mojom::CoordinationPolicyCallback {
+ public:
+  TestCoordinationUnit(CoordinationUnitProviderImpl* provider,
+                       const CoordinationUnitType& type,
+                       const std::string& id)
+      : binding_(this) {
+    CHECK(provider);
+
+    CoordinationUnitID new_cu_id(type, id);
+    mojom::CoordinationUnitPtr coordination_unit;
+    provider->CreateCoordinationUnit(mojo::MakeRequest(&coordination_unit_),
+                                     new_cu_id);
+
+    base::RunLoop callback;
+    SetGetIDClosure(callback.QuitClosure());
+    coordination_unit_->SetCoordinationPolicyCallback(GetPolicyCallback());
+    // Forces us to wait for the creation of the CUID to finish.
+    coordination_unit_->GetID(base::Bind(&TestCoordinationUnit::GetIDCallback,
+                                         base::Unretained(this)));
+
+    callback.Run();
+  }
+
+  void GetIDCallback(const CoordinationUnitID& cu_id) {
+    id_ = cu_id;
+    get_id_closure_.Run();
+  }
+
+  void SetGetIDClosure(const base::Closure& get_id_closure) {
+    get_id_closure_ = get_id_closure;
+  }
+
+  void SetPolicyClosure(const base::Closure& policy_closure) {
+    policy_update_closure_ = policy_closure;
+  }
+
+  mojom::CoordinationPolicyCallbackPtr GetPolicyCallback() {
+    return binding_.CreateInterfacePtrAndBind();
+  }
+
+  // The CU will always send policy updates on events (including parent events)
+  void ForcePolicyUpdates() {
+    base::RunLoop callback;
+    SetPolicyClosure(callback.QuitClosure());
+    mojom::EventPtr event = mojom::Event::New();
+    event->type = mojom::EventType::kTestEvent;
+    coordination_unit_->SendEvent(std::move(event));
+    callback.Run();
+  }
+
+  const mojom::CoordinationUnitPtr& interface() const {
+    return coordination_unit_;
+  }
+
+  const CoordinationUnitID& id() const { return id_; }
+
+  // mojom::CoordinationPolicyCallback:
+  void SetCoordinationPolicy(
+      resource_coordinator::mojom::CoordinationPolicyPtr policy) override {
+    if (policy_update_closure_) {
+      policy_update_closure_.Run();
+    }
+  }
+
+ private:
+  base::Closure policy_update_closure_;
+  base::Closure get_id_closure_;
+
+  mojo::Binding<mojom::CoordinationPolicyCallback> binding_;
+  mojom::CoordinationUnitPtr coordination_unit_;
+  CoordinationUnitID id_;
+};
+
+}  // namespace
+
+TEST_F(CoordinationUnitImplTest, BasicPolicyCallback) {
+  TestCoordinationUnit test_coordination_unit(
+      provider(), CoordinationUnitType::kWebContents, "test_id");
+  test_coordination_unit.ForcePolicyUpdates();
+}
+
+TEST_F(CoordinationUnitImplTest, AddChild) {
+  TestCoordinationUnit parent_unit(
+      provider(), CoordinationUnitType::kWebContents, "parent_unit");
+
+  TestCoordinationUnit child_unit(
+      provider(), CoordinationUnitType::kWebContents, "child_unit");
+
+  child_unit.ForcePolicyUpdates();
+  parent_unit.ForcePolicyUpdates();
+
+  {
+    base::RunLoop callback;
+    child_unit.SetPolicyClosure(callback.QuitClosure());
+    parent_unit.interface()->AddChild(child_unit.id());
+    callback.Run();
+  }
+
+  {
+    base::RunLoop parent_callback;
+    base::RunLoop child_callback;
+    parent_unit.SetPolicyClosure(parent_callback.QuitClosure());
+    child_unit.SetPolicyClosure(child_callback.QuitClosure());
+
+    // This event should force the policy to recalculated for all children.
+    mojom::EventPtr event = mojom::Event::New();
+    event->type = mojom::EventType::kTestEvent;
+    parent_unit.interface()->SendEvent(std::move(event));
+
+    parent_callback.Run();
+    child_callback.Run();
+  }
+}
+
+TEST_F(CoordinationUnitImplTest, CyclicGraphUnits) {
+  TestCoordinationUnit parent_unit(
+      provider(), CoordinationUnitType::kWebContents, std::string());
+
+  TestCoordinationUnit child_unit(
+      provider(), CoordinationUnitType::kWebContents, std::string());
+
+  child_unit.ForcePolicyUpdates();
+  parent_unit.ForcePolicyUpdates();
+
+  {
+    base::RunLoop callback;
+    child_unit.SetPolicyClosure(callback.QuitClosure());
+    parent_unit.interface()->AddChild(child_unit.id());
+    callback.Run();
+  }
+
+  // This should fail, due to the existing child-parent relationship.
+  // Otherwise we end up with infinite recursion and crash when recalculating
+  // policies below.
+  child_unit.interface()->AddChild(parent_unit.id());
+
+  {
+    base::RunLoop parent_callback;
+    base::RunLoop child_callback;
+    parent_unit.SetPolicyClosure(parent_callback.QuitClosure());
+    child_unit.SetPolicyClosure(child_callback.QuitClosure());
+
+    // This event should force the policy to recalculated for all children.
+    mojom::EventPtr event = mojom::Event::New();
+    event->type = mojom::EventType::kTestEvent;
+    parent_unit.interface()->SendEvent(std::move(event));
+
+    parent_callback.Run();
+    child_callback.Run();
+  }
+}
+
+}  // namespace resource_coordinator