541 lines
24 KiB
C++
541 lines
24 KiB
C++
/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <array>
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#include <android-base/test_utils.h>
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#include <gmock/gmock.h>
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#include <gtest/gtest.h>
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#include "DnsStats.h"
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namespace android::net {
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using namespace std::chrono_literals;
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using android::netdutils::IPSockAddr;
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using std::chrono::microseconds;
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using std::chrono::milliseconds;
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using ::testing::IsEmpty;
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using ::testing::UnorderedElementsAreArray;
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namespace {
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constexpr auto NO_AVERAGE_LATENCY = std::nullopt;
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// A helper which can propagate the failure to outside of the stmt to know which line
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// of stmt fails. The expectation fails only for the first failed stmt.
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#define EXPECT_NO_FAILURE(stmt) \
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do { \
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bool alreadyFailed = HasFailure(); \
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stmt; \
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if (!alreadyFailed && HasFailure()) EXPECT_FALSE(HasFailure()); \
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} while (0)
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DnsQueryEvent makeDnsQueryEvent(const Protocol protocol, const NsRcode rcode,
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const milliseconds& latency) {
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DnsQueryEvent event;
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event.set_protocol(protocol);
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event.set_rcode(rcode);
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event.set_latency_micros(latency.count() * 1000);
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return event;
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}
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StatsData makeStatsData(const IPSockAddr& server, const int total, const microseconds& latencyUs,
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const std::map<int, int>& rcodeCounts) {
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StatsData ret(server);
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ret.total = total;
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ret.latencyUs = latencyUs;
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ret.rcodeCounts = rcodeCounts;
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return ret;
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}
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} // namespace
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// TODO: add StatsDataTest to ensure its methods return correct outputs.
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class StatsRecordsTest : public ::testing::Test {};
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TEST_F(StatsRecordsTest, PushRecord) {
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const IPSockAddr server = IPSockAddr::toIPSockAddr("127.0.0.2", 53);
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constexpr size_t size = 3;
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const StatsRecords::Record recordNoError = {
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.rcode = NS_R_NO_ERROR,
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.linux_errno = 0,
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.latencyUs{10ms},
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};
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const StatsRecords::Record recordTimeout = {
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.rcode = NS_R_TIMEOUT,
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.linux_errno = 0,
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.latencyUs{250ms},
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};
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StatsRecords sr(server, size);
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EXPECT_EQ(sr.getStatsData(), makeStatsData(server, 0, 0ms, {}));
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sr.push(recordNoError);
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EXPECT_EQ(sr.getStatsData(), makeStatsData(server, 1, 10ms, {{NS_R_NO_ERROR, 1}}));
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sr.push(recordNoError);
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EXPECT_EQ(sr.getStatsData(), makeStatsData(server, 2, 20ms, {{NS_R_NO_ERROR, 2}}));
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sr.push(recordTimeout);
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EXPECT_EQ(sr.getStatsData(),
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makeStatsData(server, 3, 270ms, {{NS_R_NO_ERROR, 2}, {NS_R_TIMEOUT, 1}}));
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sr.push(recordTimeout);
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EXPECT_EQ(sr.getStatsData(),
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makeStatsData(server, 3, 510ms, {{NS_R_NO_ERROR, 1}, {NS_R_TIMEOUT, 2}}));
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sr.push(recordTimeout);
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EXPECT_EQ(sr.getStatsData(),
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makeStatsData(server, 3, 750ms, {{NS_R_NO_ERROR, 0}, {NS_R_TIMEOUT, 3}}));
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}
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class DnsStatsTest : public ::testing::Test {
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protected:
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std::string captureDumpOutput() {
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netdutils::DumpWriter dw(STDOUT_FILENO);
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CapturedStdout captured;
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mDnsStats.dump(dw);
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return captured.str();
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}
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// Get the output string from dump() and check the content.
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void verifyDumpOutput(const std::vector<StatsData>& tcpData,
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const std::vector<StatsData>& udpData,
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const std::vector<StatsData>& dotData) {
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// A pattern to capture three matches:
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// server address (empty allowed), the statistics, and the score.
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const std::regex pattern(R"(\s{4,}([0-9a-fA-F:\.]*)[ ]?([<(].*[>)])[ ]?(\S*))");
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std::string dumpString = captureDumpOutput();
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const auto check = [&](const std::vector<StatsData>& statsData, const std::string& protocol,
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std::string* dumpString) {
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SCOPED_TRACE(protocol);
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ASSERT_NE(dumpString->find(protocol), std::string::npos);
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std::smatch sm;
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// Expect to show something even if none of servers is set.
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if (statsData.empty()) {
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ASSERT_TRUE(std::regex_search(*dumpString, sm, pattern));
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EXPECT_TRUE(sm[1].str().empty());
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EXPECT_EQ(sm[2], "<no server>");
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EXPECT_TRUE(sm[3].str().empty());
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*dumpString = sm.suffix();
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return;
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}
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for (const auto& stats : statsData) {
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ASSERT_TRUE(std::regex_search(*dumpString, sm, pattern));
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EXPECT_EQ(sm[1], stats.serverSockAddr.ip().toString());
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EXPECT_FALSE(sm[2].str().empty());
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EXPECT_FALSE(sm[3].str().empty());
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*dumpString = sm.suffix();
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}
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};
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check(udpData, "UDP", &dumpString);
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check(dotData, "TLS", &dumpString);
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check(tcpData, "TCP", &dumpString);
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// Ensure the whole string has been checked.
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EXPECT_EQ(dumpString, "\n");
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}
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void verifyDnsStatsContent(Protocol protocol, const std::vector<StatsData>& expectedStats,
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const std::optional<microseconds>& expectedAvgLatency) {
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if (expectedStats.empty()) {
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EXPECT_THAT(mDnsStats.getStats(protocol), IsEmpty());
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} else {
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EXPECT_THAT(mDnsStats.getStats(protocol), UnorderedElementsAreArray(expectedStats));
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}
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EXPECT_EQ(mDnsStats.getAverageLatencyUs(protocol), expectedAvgLatency);
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}
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DnsStats mDnsStats;
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};
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TEST_F(DnsStatsTest, SetServers) {
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// Check before any operation to mDnsStats.
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verifyDumpOutput({}, {}, {});
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static const struct {
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std::vector<std::string> servers;
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std::vector<std::string> expectation;
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bool isSuccess;
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} tests[] = {
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// Normal case.
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{
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{"127.0.0.1", "127.0.0.2", "fe80::1%22", "2001:db8::2", "::1"},
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{"127.0.0.1", "127.0.0.2", "fe80::1%22", "2001:db8::2", "::1"},
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true,
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},
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// Duplicate servers.
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{
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{"127.0.0.1", "2001:db8::2", "127.0.0.1", "2001:db8::2"},
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{"127.0.0.1", "2001:db8::2"},
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true,
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},
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// Invalid server addresses. The state remains in previous state.
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{
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{"not_an_ip", "127.0.0.3", "127.a.b.2"},
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{"127.0.0.1", "2001:db8::2"},
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false,
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},
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// Clean up the old servers 127.0.0.1 and 127.0.0.2.
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{
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{"127.0.0.4", "2001:db8::5"},
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{"127.0.0.4", "2001:db8::5"},
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true,
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},
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// Empty list.
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{{}, {}, true},
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};
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for (const auto& [servers, expectation, isSuccess] : tests) {
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std::vector<IPSockAddr> ipSockAddrs;
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ipSockAddrs.reserve(servers.size());
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for (const auto& server : servers) {
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ipSockAddrs.push_back(IPSockAddr::toIPSockAddr(server, 53));
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}
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EXPECT_TRUE(mDnsStats.setServers(ipSockAddrs, PROTO_TCP) == isSuccess);
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EXPECT_TRUE(mDnsStats.setServers(ipSockAddrs, PROTO_UDP) == isSuccess);
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EXPECT_TRUE(mDnsStats.setServers(ipSockAddrs, PROTO_DOT) == isSuccess);
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std::vector<StatsData> expectedStats;
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expectedStats.reserve(expectation.size());
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for (const auto& exp : expectation) {
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expectedStats.push_back(makeStatsData(IPSockAddr::toIPSockAddr(exp, 53), 0, 0ms, {}));
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}
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_TCP, expectedStats, NO_AVERAGE_LATENCY));
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_UDP, expectedStats, NO_AVERAGE_LATENCY));
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_DOT, expectedStats, NO_AVERAGE_LATENCY));
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}
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verifyDumpOutput({}, {}, {});
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}
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TEST_F(DnsStatsTest, SetServersDifferentPorts) {
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const std::vector<IPSockAddr> servers = {
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IPSockAddr::toIPSockAddr("127.0.0.1", 0), IPSockAddr::toIPSockAddr("fe80::1", 0),
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IPSockAddr::toIPSockAddr("127.0.0.1", 53), IPSockAddr::toIPSockAddr("127.0.0.1", 5353),
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IPSockAddr::toIPSockAddr("127.0.0.1", 853), IPSockAddr::toIPSockAddr("fe80::1", 53),
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IPSockAddr::toIPSockAddr("fe80::1", 5353), IPSockAddr::toIPSockAddr("fe80::1", 853),
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};
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// Servers setup fails due to port unset.
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EXPECT_FALSE(mDnsStats.setServers(servers, PROTO_TCP));
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EXPECT_FALSE(mDnsStats.setServers(servers, PROTO_UDP));
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EXPECT_FALSE(mDnsStats.setServers(servers, PROTO_DOT));
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_TCP, {}, NO_AVERAGE_LATENCY));
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_UDP, {}, NO_AVERAGE_LATENCY));
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_DOT, {}, NO_AVERAGE_LATENCY));
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verifyDumpOutput({}, {}, {});
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EXPECT_TRUE(mDnsStats.setServers(std::vector(servers.begin() + 2, servers.end()), PROTO_TCP));
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EXPECT_TRUE(mDnsStats.setServers(std::vector(servers.begin() + 2, servers.end()), PROTO_UDP));
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EXPECT_TRUE(mDnsStats.setServers(std::vector(servers.begin() + 2, servers.end()), PROTO_DOT));
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const std::vector<StatsData> expectedStats = {
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makeStatsData(servers[2], 0, 0ms, {}), makeStatsData(servers[3], 0, 0ms, {}),
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makeStatsData(servers[4], 0, 0ms, {}), makeStatsData(servers[5], 0, 0ms, {}),
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makeStatsData(servers[6], 0, 0ms, {}), makeStatsData(servers[7], 0, 0ms, {}),
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};
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_TCP, expectedStats, NO_AVERAGE_LATENCY));
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_UDP, expectedStats, NO_AVERAGE_LATENCY));
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_DOT, expectedStats, NO_AVERAGE_LATENCY));
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verifyDumpOutput(expectedStats, expectedStats, expectedStats);
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}
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TEST_F(DnsStatsTest, AddStatsAndClear) {
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const std::vector<IPSockAddr> servers = {
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IPSockAddr::toIPSockAddr("127.0.0.1", 53),
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IPSockAddr::toIPSockAddr("127.0.0.2", 53),
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};
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const DnsQueryEvent record = makeDnsQueryEvent(PROTO_UDP, NS_R_NO_ERROR, 10ms);
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EXPECT_TRUE(mDnsStats.setServers(servers, PROTO_TCP));
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EXPECT_TRUE(mDnsStats.setServers(servers, PROTO_UDP));
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// Fail to add stats because of incorrect arguments.
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EXPECT_FALSE(mDnsStats.addStats(IPSockAddr::toIPSockAddr("127.0.0.4", 53), record));
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EXPECT_FALSE(mDnsStats.addStats(IPSockAddr::toIPSockAddr("127.a.b.4", 53), record));
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EXPECT_TRUE(mDnsStats.addStats(servers[0], record));
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EXPECT_TRUE(mDnsStats.addStats(servers[0], record));
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EXPECT_TRUE(mDnsStats.addStats(servers[1], record));
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const std::vector<StatsData> expectedStatsForTcp = {
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makeStatsData(servers[0], 0, 0ms, {}),
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makeStatsData(servers[1], 0, 0ms, {}),
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};
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const std::vector<StatsData> expectedStatsForUdp = {
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makeStatsData(servers[0], 2, 20ms, {{NS_R_NO_ERROR, 2}}),
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makeStatsData(servers[1], 1, 10ms, {{NS_R_NO_ERROR, 1}}),
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};
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_TCP, expectedStatsForTcp, NO_AVERAGE_LATENCY));
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_UDP, expectedStatsForUdp, 10ms));
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_DOT, {}, NO_AVERAGE_LATENCY));
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verifyDumpOutput(expectedStatsForTcp, expectedStatsForUdp, {});
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// Clear stats.
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EXPECT_TRUE(mDnsStats.setServers({}, PROTO_TCP));
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EXPECT_TRUE(mDnsStats.setServers({}, PROTO_UDP));
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EXPECT_TRUE(mDnsStats.setServers({}, PROTO_DOT));
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_TCP, {}, NO_AVERAGE_LATENCY));
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_UDP, {}, NO_AVERAGE_LATENCY));
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_DOT, {}, NO_AVERAGE_LATENCY));
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verifyDumpOutput({}, {}, {});
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}
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TEST_F(DnsStatsTest, StatsRemainsInExistentServer) {
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std::vector<IPSockAddr> servers = {
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IPSockAddr::toIPSockAddr("127.0.0.1", 53),
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IPSockAddr::toIPSockAddr("127.0.0.2", 53),
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};
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const DnsQueryEvent recordNoError = makeDnsQueryEvent(PROTO_UDP, NS_R_NO_ERROR, 10ms);
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const DnsQueryEvent recordTimeout = makeDnsQueryEvent(PROTO_UDP, NS_R_TIMEOUT, 250ms);
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EXPECT_TRUE(mDnsStats.setServers(servers, PROTO_UDP));
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// Add a record to 127.0.0.1.
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EXPECT_TRUE(mDnsStats.addStats(servers[0], recordNoError));
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// Add four records to 127.0.0.2.
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EXPECT_TRUE(mDnsStats.addStats(servers[1], recordNoError));
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EXPECT_TRUE(mDnsStats.addStats(servers[1], recordNoError));
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EXPECT_TRUE(mDnsStats.addStats(servers[1], recordTimeout));
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EXPECT_TRUE(mDnsStats.addStats(servers[1], recordTimeout));
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std::vector<StatsData> expectedStats = {
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makeStatsData(servers[0], 1, 10ms, {{NS_R_NO_ERROR, 1}}),
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makeStatsData(servers[1], 4, 520ms, {{NS_R_NO_ERROR, 2}, {NS_R_TIMEOUT, 2}}),
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};
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EXPECT_THAT(mDnsStats.getStats(PROTO_UDP), UnorderedElementsAreArray(expectedStats));
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_UDP, expectedStats, 106ms));
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verifyDumpOutput({}, expectedStats, {});
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// Update the server list, the stats of 127.0.0.2 will remain.
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servers = {
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IPSockAddr::toIPSockAddr("127.0.0.2", 53),
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IPSockAddr::toIPSockAddr("127.0.0.3", 53),
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IPSockAddr::toIPSockAddr("127.0.0.4", 53),
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};
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EXPECT_TRUE(mDnsStats.setServers(servers, PROTO_UDP));
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expectedStats = {
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makeStatsData(servers[0], 4, 520ms, {{NS_R_NO_ERROR, 2}, {NS_R_TIMEOUT, 2}}),
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makeStatsData(servers[1], 0, 0ms, {}),
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makeStatsData(servers[2], 0, 0ms, {}),
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};
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EXPECT_THAT(mDnsStats.getStats(PROTO_UDP), UnorderedElementsAreArray(expectedStats));
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_UDP, expectedStats, 130ms));
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verifyDumpOutput({}, expectedStats, {});
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// Let's add a record to 127.0.0.2 again.
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EXPECT_TRUE(mDnsStats.addStats(servers[0], recordNoError));
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expectedStats = {
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makeStatsData(servers[0], 5, 530ms, {{NS_R_NO_ERROR, 3}, {NS_R_TIMEOUT, 2}}),
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makeStatsData(servers[1], 0, 0ms, {}),
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makeStatsData(servers[2], 0, 0ms, {}),
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};
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EXPECT_THAT(mDnsStats.getStats(PROTO_UDP), UnorderedElementsAreArray(expectedStats));
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_UDP, expectedStats, 106ms));
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verifyDumpOutput({}, expectedStats, {});
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}
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TEST_F(DnsStatsTest, AddStatsRecords_100000) {
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constexpr size_t operations = 100000;
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constexpr size_t logSize = DnsStats::kLogSize;
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constexpr size_t rcodeNum = 4; // A value by which kLogSize is divisible.
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ASSERT_EQ(logSize % rcodeNum, 0U);
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const std::vector<IPSockAddr> servers = {
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IPSockAddr::toIPSockAddr("127.0.0.1", 53),
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IPSockAddr::toIPSockAddr("127.0.0.2", 53),
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IPSockAddr::toIPSockAddr("127.0.0.3", 53),
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IPSockAddr::toIPSockAddr("127.0.0.4", 53),
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};
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// To test unknown rcode in rcodeToName(), store the elements as type int.
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const std::array<int, rcodeNum> rcodes = {
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NS_R_NO_ERROR, // NOERROR
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NS_R_NXDOMAIN, // NXDOMAIN
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99, // UNKNOWN(99)
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NS_R_INTERNAL_ERROR, // INTERNAL_ERROR
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};
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EXPECT_TRUE(mDnsStats.setServers(servers, PROTO_TCP));
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EXPECT_TRUE(mDnsStats.setServers(servers, PROTO_UDP));
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EXPECT_TRUE(mDnsStats.setServers(servers, PROTO_DOT));
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for (size_t i = 0; i < operations; i++) {
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const NsRcode rcode = static_cast<NsRcode>(rcodes[i % rcodeNum]);
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const auto eventTcp = makeDnsQueryEvent(PROTO_TCP, rcode, milliseconds(i));
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const auto eventUdp = makeDnsQueryEvent(PROTO_UDP, rcode, milliseconds(i));
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const auto eventDot = makeDnsQueryEvent(PROTO_DOT, rcode, milliseconds(i));
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for (const auto& server : servers) {
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SCOPED_TRACE(server.toString() + "-" + std::to_string(i));
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ASSERT_TRUE(mDnsStats.addStats(server, eventTcp));
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ASSERT_TRUE(mDnsStats.addStats(server, eventUdp));
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ASSERT_TRUE(mDnsStats.addStats(server, eventDot));
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}
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}
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std::map<int, int> expectedRcodeCounts;
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for (const auto& rcode : rcodes) {
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expectedRcodeCounts.try_emplace(rcode, 32);
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}
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// The average latency 99935.5 ms is derived from (99872ms + 99873ms + ... + 99999ms) / logSize,
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// where logSize is 128.
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const std::vector<StatsData> expectedStats = {
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makeStatsData(servers[0], logSize, logSize * 99935500us, expectedRcodeCounts),
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makeStatsData(servers[1], logSize, logSize * 99935500us, expectedRcodeCounts),
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makeStatsData(servers[2], logSize, logSize * 99935500us, expectedRcodeCounts),
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makeStatsData(servers[3], logSize, logSize * 99935500us, expectedRcodeCounts),
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};
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|
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_TCP, expectedStats, 99935500us));
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_UDP, expectedStats, 99935500us));
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EXPECT_NO_FAILURE(verifyDnsStatsContent(PROTO_DOT, expectedStats, 99935500us));
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verifyDumpOutput(expectedStats, expectedStats, expectedStats);
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}
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|
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TEST_F(DnsStatsTest, GetServers_SortingByLatency) {
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const IPSockAddr server1 = IPSockAddr::toIPSockAddr("127.0.0.1", 53);
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const IPSockAddr server2 = IPSockAddr::toIPSockAddr("127.0.0.2", 53);
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const IPSockAddr server3 = IPSockAddr::toIPSockAddr("2001:db8:cafe:d00d::1", 53);
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const IPSockAddr server4 = IPSockAddr::toIPSockAddr("2001:db8:cafe:d00d::2", 53);
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|
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// Return empty list before setup.
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EXPECT_THAT(mDnsStats.getSortedServers(PROTO_UDP), IsEmpty());
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|
|
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// Before there's any stats, the list of the sorted servers is the same as the setup's one.
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EXPECT_TRUE(mDnsStats.setServers({server1, server2, server3, server4}, PROTO_UDP));
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EXPECT_TRUE(mDnsStats.setServers({server1, server2, server3, server4}, PROTO_DOT));
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EXPECT_THAT(mDnsStats.getSortedServers(PROTO_UDP),
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testing::ElementsAreArray({server1, server2, server3, server4}));
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|
|
|
// Add a record to server1. The qualities of the other servers increase.
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EXPECT_TRUE(mDnsStats.addStats(server1, makeDnsQueryEvent(PROTO_UDP, NS_R_NO_ERROR, 10ms)));
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|
EXPECT_THAT(mDnsStats.getSortedServers(PROTO_UDP),
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|
testing::ElementsAreArray({server2, server3, server4, server1}));
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|
|
|
// Add a record, with less repose time than server1, to server3.
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|
EXPECT_TRUE(mDnsStats.addStats(server3, makeDnsQueryEvent(PROTO_UDP, NS_R_NO_ERROR, 5ms)));
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|
EXPECT_THAT(mDnsStats.getSortedServers(PROTO_UDP),
|
|
testing::ElementsAreArray({server2, server4, server3, server1}));
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|
|
|
// Even though server2 has zero response time, select server4 as the first server because it
|
|
// doesn't have stats yet.
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|
EXPECT_TRUE(mDnsStats.addStats(server2, makeDnsQueryEvent(PROTO_UDP, NS_R_NO_ERROR, 0ms)));
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|
EXPECT_THAT(mDnsStats.getSortedServers(PROTO_UDP),
|
|
testing::ElementsAreArray({server4, server2, server3, server1}));
|
|
|
|
// Updating DoT record to server4 changes nothing.
|
|
EXPECT_TRUE(mDnsStats.addStats(server4, makeDnsQueryEvent(PROTO_DOT, NS_R_NO_ERROR, 10ms)));
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|
EXPECT_THAT(mDnsStats.getSortedServers(PROTO_UDP),
|
|
testing::ElementsAreArray({server4, server2, server3, server1}));
|
|
|
|
// Add a record, with a very large value of respose time, to server4.
|
|
EXPECT_TRUE(mDnsStats.addStats(server4, makeDnsQueryEvent(PROTO_UDP, NS_R_NO_ERROR, 500000ms)));
|
|
EXPECT_THAT(mDnsStats.getSortedServers(PROTO_UDP),
|
|
testing::ElementsAreArray({server2, server3, server1, server4}));
|
|
|
|
// Add some internal_error records with permission error to server2.
|
|
// The internal_error won't cause the priority of server2 drop. (but some of the other
|
|
// quality factors will still be counted, such as skipped_count and latency)
|
|
auto recordFromNetworkRestricted = makeDnsQueryEvent(PROTO_UDP, NS_R_INTERNAL_ERROR, 1ms);
|
|
recordFromNetworkRestricted.set_linux_errno(static_cast<LinuxErrno>(EPERM));
|
|
for (int i = 0; i < 3; i++) {
|
|
EXPECT_TRUE(mDnsStats.addStats(server2, recordFromNetworkRestricted));
|
|
}
|
|
EXPECT_THAT(mDnsStats.getSortedServers(PROTO_UDP),
|
|
testing::ElementsAreArray({server2, server3, server1, server4}));
|
|
|
|
// The list of the DNS servers changed.
|
|
EXPECT_TRUE(mDnsStats.setServers({server2, server4}, PROTO_UDP));
|
|
EXPECT_THAT(mDnsStats.getSortedServers(PROTO_UDP),
|
|
testing::ElementsAreArray({server2, server4}));
|
|
|
|
// It fails to add records to an non-existing server, and nothing is changed in getting
|
|
// the sorted servers.
|
|
EXPECT_FALSE(mDnsStats.addStats(server1, makeDnsQueryEvent(PROTO_UDP, NS_R_NO_ERROR, 10ms)));
|
|
EXPECT_THAT(mDnsStats.getSortedServers(PROTO_UDP),
|
|
testing::ElementsAreArray({server2, server4}));
|
|
}
|
|
|
|
TEST_F(DnsStatsTest, GetServers_DeprioritizingBadServers) {
|
|
const IPSockAddr server1 = IPSockAddr::toIPSockAddr("127.0.0.1", 53);
|
|
const IPSockAddr server2 = IPSockAddr::toIPSockAddr("127.0.0.2", 53);
|
|
const IPSockAddr server3 = IPSockAddr::toIPSockAddr("127.0.0.3", 53);
|
|
const IPSockAddr server4 = IPSockAddr::toIPSockAddr("127.0.0.4", 53);
|
|
|
|
EXPECT_TRUE(mDnsStats.setServers({server1, server2, server3, server4}, PROTO_UDP));
|
|
|
|
int server1Counts = 0;
|
|
int server2Counts = 0;
|
|
for (int i = 0; i < 5000; i++) {
|
|
const auto servers = mDnsStats.getSortedServers(PROTO_UDP);
|
|
EXPECT_EQ(servers.size(), 4U);
|
|
if (servers[0] == server1) {
|
|
// server1 is relatively slowly responsive.
|
|
EXPECT_TRUE(mDnsStats.addStats(servers[0],
|
|
makeDnsQueryEvent(PROTO_UDP, NS_R_NO_ERROR, 200ms)));
|
|
server1Counts++;
|
|
} else if (servers[0] == server2) {
|
|
// server2 is relatively quickly responsive.
|
|
EXPECT_TRUE(mDnsStats.addStats(servers[0],
|
|
makeDnsQueryEvent(PROTO_UDP, NS_R_NO_ERROR, 100ms)));
|
|
server2Counts++;
|
|
} else if (servers[0] == server3) {
|
|
// server3 always times out.
|
|
EXPECT_TRUE(mDnsStats.addStats(servers[0],
|
|
makeDnsQueryEvent(PROTO_UDP, NS_R_TIMEOUT, 1000ms)));
|
|
} else if (servers[0] == server4) {
|
|
// server4 is unusable.
|
|
EXPECT_TRUE(mDnsStats.addStats(servers[0],
|
|
makeDnsQueryEvent(PROTO_UDP, NS_R_INTERNAL_ERROR, 1ms)));
|
|
}
|
|
}
|
|
|
|
const std::vector<StatsData> allStatsData = mDnsStats.getStats(PROTO_UDP);
|
|
for (const auto& data : allStatsData) {
|
|
EXPECT_EQ(data.rcodeCounts.size(), 1U);
|
|
if (data.serverSockAddr == server1 || data.serverSockAddr == server2) {
|
|
const auto it = data.rcodeCounts.find(NS_R_NO_ERROR);
|
|
ASSERT_NE(it, data.rcodeCounts.end());
|
|
EXPECT_GT(server2Counts, 2 * server1Counts); // At least twice larger.
|
|
} else if (data.serverSockAddr == server3) {
|
|
const auto it = data.rcodeCounts.find(NS_R_TIMEOUT);
|
|
ASSERT_NE(it, data.rcodeCounts.end());
|
|
EXPECT_LT(it->second, 10);
|
|
} else if (data.serverSockAddr == server4) {
|
|
const auto it = data.rcodeCounts.find(NS_R_INTERNAL_ERROR);
|
|
ASSERT_NE(it, data.rcodeCounts.end());
|
|
EXPECT_LT(it->second, 10);
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace android::net
|