[Chromoting] Retrieve process resource usage (ProcessStats) and its tests

remoting/host/process_stats_sender_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 "remoting/host/process_stats_sender.h"
+
+#include <stdint.h>
+
+#include <utility>
+#include <vector>
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
+#include "base/time/time.h"
+#include "remoting/host/process_stats_agent.h"
+#include "remoting/proto/process_stats.pb.h"
+#include "remoting/protocol/process_stats_stub.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace remoting {
+
+namespace {
+
+class FakeProcessStatsStub : public protocol::ProcessStatsStub {
+ public:
+  FakeProcessStatsStub() = default;
+  ~FakeProcessStatsStub() override = default;
+
+  void OnProcessStats(
+      const protocol::AggregatedProcessResourceUsage& usage) override {
+    received_.push_back(usage);
+    DCHECK_LE(received_.size(), expected_usage_count_);
+    DCHECK(!quit_closure_.is_null());
+    if (received_.size() == expected_usage_count_) {
+      quit_closure_.Run();
+    }
+  }
+
+  const std::vector<protocol::AggregatedProcessResourceUsage>& received()
+      const {
+    return received_;
+  }
+
+  void set_quit_closure(base::Closure quit_closure) {
+    quit_closure_ = quit_closure;
+  }
+
+  void set_expected_usage_count(size_t expected_usage_count) {
+    expected_usage_count_ = expected_usage_count;
+  }
+
+ private:
+  std::vector<protocol::AggregatedProcessResourceUsage> received_;
+  size_t expected_usage_count_ = 0;
+  base::Closure quit_closure_;
+};
+
+class FakeProcessStatsAgent : public ProcessStatsAgent {
+ public:
+  FakeProcessStatsAgent() = default;
+  ~FakeProcessStatsAgent() override = default;
+
+  protocol::ProcessResourceUsage GetResourceUsage() override {
+    protocol::ProcessResourceUsage usage;
+    usage.set_process_name("FakeProcessStatsAgent");
+    usage.set_processor_usage(index_);
+    usage.set_working_set_size(index_);
+    usage.set_pagefile_size(index_);
+    index_++;
+    return usage;
+  }
+
+  // Checks the expected usage based on index.
+  static void AssertExpected(
+      const protocol::AggregatedProcessResourceUsage& usage,
+      size_t index) {
+    ASSERT_EQ(usage.processor_usage(), index);
+    ASSERT_EQ(usage.working_set_size(), index);
+    ASSERT_EQ(usage.pagefile_size(), index);
+  }
+
+  static void AssertExpected(const protocol::ProcessResourceUsage& usage,
+                             size_t index) {
+    ASSERT_EQ(usage.processor_usage(), index);
+    ASSERT_EQ(usage.working_set_size(), index);
+    ASSERT_EQ(usage.pagefile_size(), index);
+  }
+
+  size_t issued_times() const { return index_; }
+
+ private:
+  size_t index_ = 0;
+};
+
+}  // namespace
+
+TEST(ProcessStatsSenderTest, ReportUsage) {
+  base::MessageLoop message_loop;
+  base::RunLoop run_loop;
+  FakeProcessStatsStub stub;
+  std::unique_ptr<ProcessStatsSender> stats;
+  FakeProcessStatsAgent agent;
+
+  stub.set_expected_usage_count(10);
+  stub.set_quit_closure(base::Bind(
+      [](std::unique_ptr<ProcessStatsSender>* stats,
+         const FakeProcessStatsStub& stub, const FakeProcessStatsAgent& agent,
+         base::RunLoop* run_loop) -> void {
+        ASSERT_EQ(stub.received().size(), agent.issued_times());
+        stats->reset();
+        run_loop->Quit();
+      },
+      base::Unretained(&stats), base::ConstRef(stub), base::ConstRef(agent),
+      base::Unretained(&run_loop)));
+  message_loop.task_runner()->PostTask(
+      FROM_HERE,
+      base::Bind(
+          [](std::unique_ptr<ProcessStatsSender>* stats,
+             FakeProcessStatsStub* stub, FakeProcessStatsAgent* agent) -> void {
+            stats->reset(new ProcessStatsSender(
+                stub, base::TimeDelta::FromMilliseconds(1), { agent }));
+          },
+          base::Unretained(&stats), base::Unretained(&stub),
+          base::Unretained(&agent)));
+  run_loop.Run();
+
+  ASSERT_EQ(stub.received().size(), 10U);
+  for (size_t i = 0; i < stub.received().size(); i++) {
+    FakeProcessStatsAgent::AssertExpected(stub.received()[i], i);
+  }
+}
+
+TEST(ProcessStatsSenderTest, MergeUsage) {
+  base::MessageLoop message_loop;
+  base::RunLoop run_loop;
+  FakeProcessStatsStub stub;
+  std::unique_ptr<ProcessStatsSender> stats;
+  // Owned by |stats|.
+  FakeProcessStatsAgent agent1;
+  FakeProcessStatsAgent agent2;
+
+  stub.set_expected_usage_count(10);
+  stub.set_quit_closure(base::Bind(
+      [](std::unique_ptr<ProcessStatsSender>* stats,
+         const FakeProcessStatsStub& stub, const FakeProcessStatsAgent& agent1,
+         const FakeProcessStatsAgent& agent2, base::RunLoop* run_loop) -> void {
+        ASSERT_EQ(stub.received().size(), agent1.issued_times());
+        ASSERT_EQ(stub.received().size(), agent2.issued_times());
+        stats->reset();
+        run_loop->Quit();
+      },
+      base::Unretained(&stats), base::ConstRef(stub), base::ConstRef(agent1),
+      base::ConstRef(agent2), base::Unretained(&run_loop)));
+  message_loop.task_runner()->PostTask(
+      FROM_HERE,
+      base::Bind(
+          [](std::unique_ptr<ProcessStatsSender>* stats,
+             FakeProcessStatsStub* stub, FakeProcessStatsAgent* agent1,
+             FakeProcessStatsAgent* agent2) -> void {
+            stats->reset(new ProcessStatsSender(
+                stub, base::TimeDelta::FromMilliseconds(1),
+                { agent1, agent2 } ));
+          },
+          base::Unretained(&stats), base::Unretained(&stub),
+          base::Unretained(&agent1), base::Unretained(&agent2)));
+  run_loop.Run();
+
+  ASSERT_EQ(stub.received().size(), 10U);
+  for (size_t i = 0; i < stub.received().size(); i++) {
+    FakeProcessStatsAgent::AssertExpected(stub.received()[i], i * 2);
+    for (int j = 0; j < stub.received()[i].usages_size(); j++) {
+      FakeProcessStatsAgent::AssertExpected(
+          stub.received()[i].usages().Get(j), i);
+    }
+  }
+}
+
+}  // namespace remoting