Josh Gao | 822f674 | 2021-02-03 22:12:41 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2020 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "property_monitor.h" |
| 18 | |
| 19 | #include <stdlib.h> |
| 20 | #include <unistd.h> |
| 21 | |
| 22 | #include <chrono> |
| 23 | #include <functional> |
| 24 | #include <mutex> |
| 25 | #include <string> |
| 26 | #include <thread> |
| 27 | #include <unordered_map> |
| 28 | #include <vector> |
| 29 | |
| 30 | #include <android-base/logging.h> |
| 31 | #include <android-base/properties.h> |
| 32 | #include <android-base/thread_annotations.h> |
| 33 | #include <gtest/gtest.h> |
| 34 | |
| 35 | using namespace std::chrono_literals; |
| 36 | |
| 37 | struct PropertyChanges { |
| 38 | std::unordered_map<std::string, std::vector<std::string>> changes GUARDED_BY(mutex); |
| 39 | std::mutex mutex; |
| 40 | }; |
| 41 | |
| 42 | static std::string ManglePropertyName(std::string name) { |
| 43 | name.push_back('.'); |
| 44 | name.append(std::to_string(gettid())); |
| 45 | name.append(std::to_string(rand())); |
| 46 | return name; |
| 47 | } |
| 48 | |
| 49 | static std::thread SpawnThread(PropertyMonitor* pm) { |
| 50 | return std::thread([pm]() { |
| 51 | pm->Run(); |
| 52 | }); |
| 53 | } |
| 54 | |
| 55 | static std::function<void()> RegisterExitCallback(PropertyMonitor* pm) { |
| 56 | std::string prop_name = ManglePropertyName("debug.property_monitor_test.exit"); |
| 57 | android::base::SetProperty(prop_name, "0"); |
| 58 | pm->Add(prop_name, [](std::string value) { return value != "1"; }); |
| 59 | return [prop_name]() { |
| 60 | android::base::SetProperty(prop_name, "1"); |
| 61 | }; |
| 62 | } |
| 63 | |
| 64 | static void RegisterCallback(PropertyMonitor* pm, PropertyChanges* output, |
| 65 | std::string property_name) { |
| 66 | pm->Add(property_name, [output, property_name](std::string value) { |
| 67 | std::lock_guard<std::mutex> lock(output->mutex); |
| 68 | LOG(INFO) << property_name << " = " << value; |
| 69 | output->changes[property_name].emplace_back(std::move(value)); |
| 70 | return true; |
| 71 | }); |
| 72 | } |
| 73 | |
| 74 | TEST(PropertyMonitorTest, initial) { |
| 75 | PropertyMonitor pm; |
| 76 | PropertyChanges output; |
| 77 | |
| 78 | auto exit_fn = RegisterExitCallback(&pm); |
| 79 | |
| 80 | std::string foo = ManglePropertyName("debug.property_monitor_test.initial"); |
| 81 | std::string never_set = ManglePropertyName("debug.property_monitor_test.never_set"); |
| 82 | RegisterCallback(&pm, &output, foo); |
| 83 | android::base::SetProperty(foo, "foo"); |
| 84 | |
| 85 | RegisterCallback(&pm, &output, never_set); |
| 86 | |
| 87 | auto thread = SpawnThread(&pm); |
| 88 | |
| 89 | exit_fn(); |
| 90 | thread.join(); |
| 91 | |
| 92 | std::lock_guard<std::mutex> lock(output.mutex); |
| 93 | ASSERT_EQ(2UL, output.changes.size()); |
| 94 | ASSERT_EQ(2UL, output.changes[foo].size()); |
| 95 | ASSERT_EQ("", output.changes[foo][0]); |
| 96 | ASSERT_EQ("foo", output.changes[foo][1]); |
| 97 | ASSERT_EQ("", output.changes[never_set][0]); |
| 98 | } |
| 99 | |
| 100 | TEST(PropertyMonitorTest, change) { |
| 101 | PropertyMonitor pm; |
| 102 | PropertyChanges output; |
| 103 | |
| 104 | auto exit_fn = RegisterExitCallback(&pm); |
| 105 | |
| 106 | std::string foo = ManglePropertyName("debug.property_monitor_test.foo"); |
| 107 | |
| 108 | RegisterCallback(&pm, &output, foo); |
| 109 | android::base::SetProperty(foo, "foo"); |
| 110 | |
| 111 | auto thread = SpawnThread(&pm); |
| 112 | std::this_thread::sleep_for(100ms); |
| 113 | |
| 114 | { |
| 115 | std::lock_guard<std::mutex> lock(output.mutex); |
| 116 | ASSERT_EQ(1UL, output.changes.size()); |
| 117 | ASSERT_EQ(2UL, output.changes[foo].size()); |
| 118 | ASSERT_EQ("", output.changes[foo][0]); |
| 119 | ASSERT_EQ("foo", output.changes[foo][1]); |
| 120 | } |
| 121 | |
| 122 | android::base::SetProperty(foo, "bar"); |
| 123 | std::this_thread::sleep_for(100ms); |
| 124 | |
| 125 | { |
| 126 | std::lock_guard<std::mutex> lock(output.mutex); |
| 127 | ASSERT_EQ(1UL, output.changes.size()); |
| 128 | ASSERT_EQ(3UL, output.changes[foo].size()); |
| 129 | ASSERT_EQ("", output.changes[foo][0]); |
| 130 | ASSERT_EQ("foo", output.changes[foo][1]); |
| 131 | ASSERT_EQ("bar", output.changes[foo][2]); |
| 132 | } |
| 133 | |
| 134 | exit_fn(); |
| 135 | thread.join(); |
| 136 | } |
| 137 | |
| 138 | TEST(PropertyMonitorTest, multiple) { |
| 139 | PropertyMonitor pm; |
| 140 | PropertyChanges output; |
| 141 | |
| 142 | auto exit_fn = RegisterExitCallback(&pm); |
| 143 | |
| 144 | std::string foo = ManglePropertyName("debug.property_monitor_test.foo"); |
| 145 | std::string bar = ManglePropertyName("debug.property_monitor_test.bar"); |
| 146 | |
| 147 | RegisterCallback(&pm, &output, foo); |
| 148 | RegisterCallback(&pm, &output, bar); |
| 149 | |
| 150 | android::base::SetProperty(foo, "foo"); |
| 151 | android::base::SetProperty(bar, "bar"); |
| 152 | |
| 153 | auto thread = SpawnThread(&pm); |
| 154 | std::this_thread::sleep_for(100ms); |
| 155 | |
| 156 | { |
| 157 | std::lock_guard<std::mutex> lock(output.mutex); |
| 158 | ASSERT_EQ(2UL, output.changes.size()); |
| 159 | |
| 160 | ASSERT_EQ(2UL, output.changes[foo].size()); |
| 161 | ASSERT_EQ("", output.changes[foo][0]); |
| 162 | ASSERT_EQ("foo", output.changes[foo][1]); |
| 163 | |
| 164 | ASSERT_EQ(2UL, output.changes[bar].size()); |
| 165 | ASSERT_EQ("", output.changes[bar][0]); |
| 166 | ASSERT_EQ("bar", output.changes[bar][1]); |
| 167 | } |
| 168 | |
| 169 | android::base::SetProperty(foo, "bar"); |
| 170 | android::base::SetProperty(bar, "foo"); |
| 171 | std::this_thread::sleep_for(100ms); |
| 172 | |
| 173 | { |
| 174 | std::lock_guard<std::mutex> lock(output.mutex); |
| 175 | ASSERT_EQ(2UL, output.changes.size()); |
| 176 | |
| 177 | ASSERT_EQ(3UL, output.changes[foo].size()); |
| 178 | ASSERT_EQ("", output.changes[foo][0]); |
| 179 | ASSERT_EQ("foo", output.changes[foo][1]); |
| 180 | ASSERT_EQ("bar", output.changes[foo][2]); |
| 181 | |
| 182 | ASSERT_EQ(3UL, output.changes[bar].size()); |
| 183 | ASSERT_EQ("", output.changes[foo][0]); |
| 184 | ASSERT_EQ("bar", output.changes[bar][1]); |
| 185 | ASSERT_EQ("foo", output.changes[bar][2]); |
| 186 | } |
| 187 | |
| 188 | exit_fn(); |
| 189 | thread.join(); |
| 190 | } |