Mike Yu | 39df0b1 | 2019-10-31 16:12:23 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2019 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 <regex> |
| 18 | #include <thread> |
| 19 | |
| 20 | #include <android-base/strings.h> |
| 21 | #include <android-base/test_utils.h> |
| 22 | #include <gtest/gtest.h> |
| 23 | |
| 24 | #include "DnsQueryLog.h" |
| 25 | |
| 26 | using namespace std::chrono_literals; |
| 27 | |
| 28 | namespace android::net { |
| 29 | |
| 30 | namespace { |
| 31 | |
| 32 | // Dump the log to STDOUT and capture it. |
| 33 | std::string captureDumpOutput(const DnsQueryLog& queryLog) { |
| 34 | netdutils::DumpWriter dw(STDOUT_FILENO); |
| 35 | CapturedStdout captured; |
| 36 | queryLog.dump(dw); |
| 37 | return captured.str(); |
| 38 | } |
| 39 | |
| 40 | // A simple check for the dump result by checking the netIds one by one. |
| 41 | void verifyDumpOutput(const std::string& dumpLog, const std::vector<int>& expectedNetIds) { |
| 42 | // Capture three matches: netId, hostname, and answer (empty allowed). |
| 43 | static const std::regex pattern( |
| 44 | R"(netId=(\d+).* hostname=([\w\*]+) answer=\[([\w:,\.\*\s]*)\])"); |
| 45 | |
| 46 | std::string str(dumpLog); |
| 47 | std::smatch sm; |
| 48 | for (const auto& netId : expectedNetIds) { |
| 49 | SCOPED_TRACE(netId); |
| 50 | EXPECT_TRUE(std::regex_search(str, sm, pattern)); |
| 51 | EXPECT_EQ(sm[1], std::to_string(netId)); |
| 52 | str = sm.suffix(); |
| 53 | } |
| 54 | |
| 55 | // Ensure the dumpLog is exactly as expected. |
| 56 | EXPECT_FALSE(std::regex_search(str, sm, pattern)); |
| 57 | } |
| 58 | |
| 59 | } // namespace |
| 60 | |
| 61 | class DnsQueryLogTest : public ::testing::Test { |
| 62 | protected: |
| 63 | const std::vector<std::string> serversV4 = {"127.0.0.1", "1.2.3.4"}; |
| 64 | const std::vector<std::string> serversV4V6 = {"127.0.0.1", "1.2.3.4", "2001:db8::1", |
| 65 | "fe80:1::2%testnet"}; |
| 66 | }; |
| 67 | |
| 68 | TEST_F(DnsQueryLogTest, Push) { |
| 69 | std::vector<DnsQueryLog::Record> records = { |
| 70 | DnsQueryLog::Record(30, 1000, 1000, "example.com", serversV4, 10), |
| 71 | DnsQueryLog::Record(31, 1000, 1000, "", serversV4, 10), // Empty hostname. |
| 72 | DnsQueryLog::Record(32, 1000, 1000, "example.com", {}, 10), // No answer. |
| 73 | DnsQueryLog::Record(33, 1000, 1000, "example.com", serversV4V6, 10), |
| 74 | }; |
| 75 | DnsQueryLog queryLog; |
| 76 | for (auto& r : records) { |
| 77 | queryLog.push(std::move(r)); |
| 78 | } |
| 79 | |
| 80 | std::string output = captureDumpOutput(queryLog); |
| 81 | verifyDumpOutput(output, {30, 31, 32, 33}); |
| 82 | } |
| 83 | |
| 84 | TEST_F(DnsQueryLogTest, PushStressTest) { |
| 85 | const int threadNum = 100; |
| 86 | const int pushNum = 1000; |
| 87 | const size_t size = 500; |
| 88 | DnsQueryLog queryLog(size); |
| 89 | std::vector<std::thread> threads(threadNum); |
| 90 | |
| 91 | // Launch 'threadNum' threads to push the same queryLog 'pushNum' times. |
| 92 | for (auto& thread : threads) { |
| 93 | thread = std::thread([&]() { |
| 94 | for (int i = 0; i < pushNum; i++) { |
| 95 | DnsQueryLog::Record record(30, 1000, 1000, "www.example.com", serversV4, 10); |
| 96 | queryLog.push(std::move(record)); |
| 97 | } |
| 98 | }); |
| 99 | } |
| 100 | for (auto& thread : threads) { |
| 101 | thread.join(); |
| 102 | } |
| 103 | |
| 104 | // Verify there are exact 'size' records in queryLog. |
| 105 | std::string output = captureDumpOutput(queryLog); |
| 106 | verifyDumpOutput(output, std::vector(size, 30)); |
| 107 | } |
| 108 | |
| 109 | TEST_F(DnsQueryLogTest, ZeroSize) { |
| 110 | const size_t size = 0; |
| 111 | DnsQueryLog::Record r1(30, 1000, 1000, "www.example1.com", serversV4V6, 10); |
| 112 | DnsQueryLog::Record r2(31, 1000, 1000, "www.example2.com", serversV4V6, 10); |
| 113 | DnsQueryLog::Record r3(32, 1000, 1000, "www.example3.com", serversV4V6, 10); |
| 114 | |
| 115 | DnsQueryLog queryLog(size); |
| 116 | queryLog.push(std::move(r1)); |
| 117 | queryLog.push(std::move(r2)); |
| 118 | queryLog.push(std::move(r3)); |
| 119 | |
| 120 | std::string output = captureDumpOutput(queryLog); |
| 121 | verifyDumpOutput(output, {}); |
| 122 | } |
| 123 | |
| 124 | TEST_F(DnsQueryLogTest, CapacityFull) { |
| 125 | const size_t size = 3; |
| 126 | DnsQueryLog::Record r1(30, 1000, 1000, "www.example1.com", serversV4V6, 10); |
| 127 | DnsQueryLog::Record r2(31, 1000, 1000, "www.example2.com", serversV4V6, 10); |
| 128 | DnsQueryLog::Record r3(32, 1000, 1000, "www.example3.com", serversV4V6, 10); |
| 129 | DnsQueryLog::Record r4(33, 1000, 1000, "www.example4.com", serversV4V6, 10); |
| 130 | const std::vector<int> expectedNetIds = {31, 32, 33}; |
| 131 | |
| 132 | DnsQueryLog queryLog(size); |
| 133 | queryLog.push(std::move(r1)); |
| 134 | queryLog.push(std::move(r2)); |
| 135 | queryLog.push(std::move(r3)); |
| 136 | queryLog.push(std::move(r4)); |
| 137 | |
| 138 | std::string output = captureDumpOutput(queryLog); |
| 139 | verifyDumpOutput(output, expectedNetIds); |
| 140 | } |
| 141 | |
| 142 | TEST_F(DnsQueryLogTest, ValidityTime) { |
| 143 | DnsQueryLog::Record r1(30, 1000, 1000, "www.example.com", serversV4, 10); |
| 144 | DnsQueryLog queryLog(3, 100ms); |
| 145 | queryLog.push(std::move(r1)); |
| 146 | |
| 147 | // Dump the output and verify the correctness by checking netId. |
| 148 | std::string output = captureDumpOutput(queryLog); |
| 149 | verifyDumpOutput(output, {30}); |
| 150 | |
| 151 | std::this_thread::sleep_for(150ms); |
| 152 | |
| 153 | // The record is expired thus not shown in the output. |
| 154 | output = captureDumpOutput(queryLog); |
| 155 | verifyDumpOutput(output, {}); |
| 156 | |
| 157 | // Push another record to ensure it still works. |
| 158 | DnsQueryLog::Record r2(31, 1000, 1000, "example.com", serversV4V6, 10); |
| 159 | queryLog.push(std::move(r2)); |
| 160 | output = captureDumpOutput(queryLog); |
| 161 | verifyDumpOutput(output, {31}); |
| 162 | } |
| 163 | |
| 164 | } // namespace android::net |