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DarkflameServer/tests/dCommonTests/TrafficStatsTests.cpp
Aaron Kimbrell 9e8f161dd8 feat(traffic): count traffic by peer and by connection 
Every server now splits its packet counts by peer: its own connections
(players on auth and worlds), its master link, or other servers (the
worlds on chat, every server on master, a world's chat link, which is
now counted too). HTTP requests carrying X-Darkflame-Server count as
another server's, the dashboard counts its own requests to the UGC
server, and each HTTP client address is counted. The report also gets
each RakNet connection's statistics (worlds name the player on it),
trimmed to the 32 busiest with the rest summed. Counting stays on the
main loop, except the dashboard's UGC fetches, which only touch the
locked recorder.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-09-29 18:28:39 -05:00

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#include <gtest/gtest.h>
#include <chrono>
#include <cstring>
#include "TrafficStats.h"
#include "MessageIdentifiers.h"
#include "ServiceType.h"
#include "MessageType/Client.h"
#include "MessageType/Game.h"
#include "MessageType/World.h"
using namespace TrafficStats;
namespace {
// An LU packet header (and, for game messages, the target object and message ID)
std::vector<uint8_t> LuPacket(ServiceType service, uint32_t packet, int32_t gameMessage = -1, size_t pad = 0) {
std::vector<uint8_t> data{ ID_USER_PACKET_ENUM };
const auto s = static_cast<uint16_t>(service);
data.push_back(static_cast<uint8_t>(s));
data.push_back(static_cast<uint8_t>(s >> 8));
for (int i = 0; i < 4; i++) data.push_back(static_cast<uint8_t>(packet >> (8 * i)));
data.push_back(0);
if (gameMessage >= 0) {
for (int i = 0; i < 8; i++) data.push_back(0x11);
data.push_back(static_cast<uint8_t>(gameMessage));
data.push_back(static_cast<uint8_t>(gameMessage >> 8));
}
data.resize(data.size() + pad);
return data;
}
}
TEST(TrafficStatsTest, HistogramBucketsDoubleEveryThird) {
EXPECT_EQ(Histogram::UpperBound(0), 100u);
EXPECT_EQ(Histogram::UpperBound(3), 200u);
EXPECT_EQ(Histogram::UpperBound(30), 102400u);
EXPECT_EQ(Histogram::UpperBound(Histogram::BUCKETS - 1), UINT64_MAX);
EXPECT_EQ(Histogram::BucketFor(0), 0u);
EXPECT_EQ(Histogram::BucketFor(100), 0u);
EXPECT_EQ(Histogram::BucketFor(101), 1u);
EXPECT_EQ(Histogram::BucketFor(200), 3u);
EXPECT_EQ(Histogram::BucketFor(UINT64_MAX), Histogram::BUCKETS - 1);
for (size_t i = 1; i + 1 < Histogram::BUCKETS; i++) EXPECT_GT(Histogram::UpperBound(i), Histogram::UpperBound(i - 1));
}
TEST(TrafficStatsTest, PercentilesAreWithinABucket) {
Histogram h;
for (uint64_t ms = 1; ms <= 1000; ms++) h.Add(ms * 1000);
EXPECT_EQ(h.Count(), 1000u);
EXPECT_EQ(h.Sum(), 500500000u);
// A bucket spans 26%, so the answer is within that of the exact value
for (const auto [fraction, exact] : { std::pair{ 0.5, 500000.0 }, std::pair{ 0.95, 950000.0 }, std::pair{ 0.99, 990000.0 } }) {
const auto p = static_cast<double>(h.Percentile(fraction));
EXPECT_NEAR(p, exact, exact * 0.26) << fraction;
}
EXPECT_LE(h.Percentile(0.5), h.Percentile(0.95));
EXPECT_LE(h.Percentile(0.95), h.Percentile(0.99));
EXPECT_EQ(Histogram().Percentile(0.5), 0u);
}
TEST(TrafficStatsTest, SinglePercentileStaysInItsBucket) {
Histogram h;
h.Add(150);
const auto p = h.Percentile(0.99);
EXPECT_GT(p, Histogram::UpperBound(0));
EXPECT_LE(p, Histogram::UpperBound(Histogram::BucketFor(150)));
// Overflow reports its lower bound instead of infinity
Histogram slow;
slow.Add(3600ull * 1000000);
EXPECT_EQ(slow.Percentile(0.5), Histogram::UpperBound(Histogram::BUCKETS - 2));
}
TEST(TrafficStatsTest, HistogramsMergeAndSurviveSparse) {
Histogram a, b;
a.Add(500, 3);
b.Add(500);
b.Add(40000, 2);
a.Merge(b);
EXPECT_EQ(a.Count(), 6u);
EXPECT_EQ(a.Sum(), 500u * 4 + 80000u);
const auto sparse = a.Sparse();
ASSERT_EQ(sparse.size(), 2u);
const auto back = Histogram::FromSparse(sparse, a.Sum());
for (size_t i = 0; i < Histogram::BUCKETS; i++) EXPECT_EQ(back.At(i), a.At(i));
EXPECT_EQ(back.Sum(), a.Sum());
EXPECT_EQ(back.Percentile(0.5), a.Percentile(0.5));
}
TEST(TrafficStatsTest, StatusClasses) {
EXPECT_EQ(StatusClass(101), 0u);
EXPECT_EQ(StatusClass(200), 1u);
EXPECT_EQ(StatusClass(304), 2u);
EXPECT_EQ(StatusClass(404), 3u);
EXPECT_EQ(StatusClass(503), 4u);
EXPECT_EQ(StatusClass(0), 4u);
EXPECT_EQ(StatusClass(999), 4u);
}
TEST(TrafficStatsTest, KeysFromPackets) {
const auto world = LuPacket(ServiceType::WORLD, static_cast<uint32_t>(MessageType::World::POSITION_UPDATE), -1, 20);
auto key = KeyOf(world.data(), world.size(), false);
EXPECT_EQ(key.service, static_cast<uint16_t>(ServiceType::WORLD));
EXPECT_EQ(key.packet, static_cast<uint32_t>(MessageType::World::POSITION_UPDATE));
EXPECT_EQ(key.gameMessage, 0);
EXPECT_FALSE(key.outbound);
const auto gm = LuPacket(ServiceType::CLIENT, static_cast<uint32_t>(MessageType::Client::GAME_MSG), static_cast<int32_t>(MessageType::Game::REQUEST_USE));
key = KeyOf(gm.data(), gm.size(), true);
EXPECT_EQ(key.service, static_cast<uint16_t>(ServiceType::CLIENT));
EXPECT_EQ(key.gameMessage, static_cast<uint16_t>(MessageType::Game::REQUEST_USE));
EXPECT_TRUE(key.outbound);
// A game message cut short has no message ID; never reads past the end
key = KeyOf(gm.data(), 17, true);
EXPECT_EQ(key.gameMessage, 0);
const uint8_t replica[] = { ID_REPLICA_MANAGER_SERIALIZE, 1, 2 };
key = KeyOf(replica, sizeof(replica), true);
EXPECT_EQ(key.service, MessageKey::RAKNET);
EXPECT_EQ(key.packet, static_cast<uint32_t>(ID_REPLICA_MANAGER_SERIALIZE));
const uint8_t shortLu[] = { ID_USER_PACKET_ENUM, 4, 0 };
EXPECT_EQ(KeyOf(shortLu, sizeof(shortLu), false).service, MessageKey::RAKNET);
EXPECT_EQ(KeyOf(nullptr, 0, false).service, MessageKey::RAKNET);
}
TEST(TrafficStatsTest, KeysPackAndUnpack) {
for (const auto& key : { MessageKey{ true, 5, 12, 1234 }, MessageKey{ false, MessageKey::RAKNET, 36, 0 }, MessageKey{ false, 4, 0xFFFFFFFF, 0xFFFF } }) {
EXPECT_EQ(MessageKey::Unpack(key.Packed()), key);
}
EXPECT_NE((MessageKey{ true, 5, 12, 0 }).Packed(), (MessageKey{ false, 5, 12, 0 }).Packed());
}
TEST(TrafficStatsTest, RecorderFillsSilentSecondsAndKeepsTheCurrentOne) {
Recorder r;
const MessageKey in{ false, 4, 5, 0 };
const MessageKey out{ true, 5, 12, 0 };
r.Packet(1000, in, 100);
r.Packet(1000, in, 50);
r.Packet(1000, out, 30, 4); // a broadcast to four
r.Packet(1003, in, 10);
r.Packet(1005, in, 10); // the current second: stays
const auto report = r.Take(1005);
ASSERT_EQ(report.seconds.size(), 5u); // 1000..1004
EXPECT_EQ(report.seconds[0].time, 1000);
EXPECT_EQ(report.seconds[0].packetsIn, 2u);
EXPECT_EQ(report.seconds[0].bytesIn, 150u);
EXPECT_EQ(report.seconds[0].packetsOut, 4u);
EXPECT_EQ(report.seconds[0].bytesOut, 120u);
EXPECT_TRUE(report.seconds[1].Idle());
EXPECT_EQ(report.seconds[3].packetsIn, 1u);
EXPECT_EQ(report.seconds[4].time, 1004);
const auto next = r.Take(1008);
ASSERT_EQ(next.seconds.size(), 3u); // 1005..1007, no second twice
EXPECT_EQ(next.seconds[0].time, 1005);
EXPECT_EQ(next.seconds[0].packetsIn, 1u);
}
TEST(TrafficStatsTest, RecorderCapsLongSilences) {
Recorder r;
r.Packet(1000, MessageKey{}, 1);
r.Take(1001);
const auto report = r.Take(1001 + 10000);
EXPECT_EQ(report.seconds.size(), static_cast<size_t>(Recorder::MAX_GAP));
EXPECT_EQ(report.seconds.back().time, 1000 + 10000);
}
TEST(TrafficStatsTest, RecorderTopMessagesPerDirection) {
Recorder r;
for (uint32_t id = 0; id < 40; id++) {
for (uint32_t n = 0; n <= id; n++) {
r.Packet(1, MessageKey{ false, 4, id, 0 }, 10);
r.Packet(1, MessageKey{ true, 5, id, 0 }, 10);
}
}
const auto report = r.Take(2);
ASSERT_EQ(report.messages.size(), Recorder::TOP_MESSAGES * 2);
EXPECT_FALSE(report.messages.front().key.outbound);
EXPECT_EQ(report.messages.front().key.packet, 39u);
EXPECT_EQ(report.messages.front().count, 40u);
EXPECT_TRUE(report.messages[Recorder::TOP_MESSAGES].key.outbound);
EXPECT_TRUE(r.Take(3).messages.empty());
}
TEST(TrafficStatsTest, RecorderHttpAndRoutes) {
Recorder r;
r.Http(10, "GET /api/players", 200, 1500, 2000);
r.Http(10, "GET /api/players", 404, 300, 20);
r.Http(11, "POST /api/login", 500, 90000, 50);
for (size_t i = 0; i < Recorder::MAX_ROUTES + 5; i++) r.Http(11, "GET /r" + std::to_string(i), 200, 100, 1);
r.SetGauge("workers_busy", [] { return 3.0; });
const auto report = r.Take(12);
ASSERT_EQ(report.seconds.size(), 2u);
EXPECT_EQ(report.seconds[0].httpRequests, 2u);
EXPECT_EQ(report.seconds[0].httpStatus[1], 1u);
EXPECT_EQ(report.seconds[0].httpStatus[3], 1u);
EXPECT_EQ(report.seconds[0].httpBytesOut, 2020u);
EXPECT_EQ(report.seconds[0].httpLatency.Count(), 2u);
EXPECT_EQ(report.routes.size(), Recorder::MAX_ROUTES + 1); // the rest counted as "other"
const auto other = std::find_if(report.routes.begin(), report.routes.end(), [](const RouteStats& s) { return s.route == "other"; });
ASSERT_NE(other, report.routes.end());
EXPECT_EQ(other->count, 7u);
ASSERT_EQ(report.gauges.size(), 1u);
EXPECT_EQ(report.gauges[0].second, 3.0);
}
TEST(TrafficStatsTest, DueAfterTheInterval) {
Recorder r;
EXPECT_FALSE(r.Due(100, 5)); // starts the clock
EXPECT_FALSE(r.Due(104, 5));
EXPECT_TRUE(r.Due(105, 5));
r.Take(105);
EXPECT_FALSE(r.Due(106, 5));
}
// Counting is on every packet's path: keep it cheap
TEST(TrafficStatsTest, CountingIsCheap) {
Recorder r;
const auto packet = LuPacket(ServiceType::CLIENT, static_cast<uint32_t>(MessageType::Client::GAME_MSG), 100, 30);
constexpr int N = 1000000;
const auto start = std::chrono::steady_clock::now();
for (int i = 0; i < N; i++) r.Packet(Now(), KeyOf(packet.data(), packet.size(), (i & 1) != 0), packet.size());
const auto ns = std::chrono::duration_cast<std::chrono::nanoseconds>(std::chrono::steady_clock::now() - start).count() / N;
std::printf("[ ] KeyOf + Recorder::Packet: %lld ns per packet\n", static_cast<long long>(ns));
EXPECT_LT(ns, 2000); // generous for slow CI machines and sanitizers
}
TEST(TrafficStatsTest, RecorderSplitsPacketsByPeer) {
Recorder r;
const MessageKey in{ false, 4, 5, 0 };
const MessageKey out{ true, 5, 12, 0 };
r.Packet(2000, in, 100); // clients by default
r.Packet(2000, out, 40, 3, Peer::CLIENTS);
r.Packet(2000, out, 20, 1, Peer::MASTER);
r.Packet(2000, in, 60, 1, Peer::MASTER);
r.Packet(2000, in, 8, 1, Peer::SERVERS);
const auto report = r.Take(2001);
EXPECT_TRUE(report.peerSplit);
ASSERT_EQ(report.seconds.size(), 1u);
const auto& s = report.seconds[0];
EXPECT_EQ(s.peers[0], (PeerCounts{ 1, 3, 100, 120 }));
EXPECT_EQ(s.peers[1], (PeerCounts{ 1, 1, 60, 20 }));
EXPECT_EQ(s.peers[2], (PeerCounts{ 1, 0, 8, 0 }));
// The split adds up to the totals
uint64_t packetsIn = 0, bytesOut = 0;
for (const auto& p : s.peers) { packetsIn += p.packetsIn; bytesOut += p.bytesOut; }
EXPECT_EQ(packetsIn, s.packetsIn);
EXPECT_EQ(bytesOut, s.bytesOut);
Second merged = s;
merged.Merge(s);
EXPECT_EQ(merged.peers[1], (PeerCounts{ 2, 2, 120, 40 }));
}
TEST(TrafficStatsTest, RecorderSplitsHttpByWhoAsked) {
Recorder r;
r.Http(3000, "GET /api/a", 200, 100, 1000);
r.Http(3000, "GET /api/a", 200, 100, 500, true);
r.HttpOut(3000, 700);
const auto report = r.Take(3001);
ASSERT_EQ(report.seconds.size(), 1u);
EXPECT_EQ(report.seconds[0].httpRequests, 2u);
EXPECT_EQ(report.seconds[0].httpFromServers, 1u);
EXPECT_EQ(report.seconds[0].httpFromServersBytesOut, 500u);
EXPECT_EQ(report.seconds[0].httpOutRequests, 1u);
EXPECT_EQ(report.seconds[0].httpOutBytesIn, 700u);
}
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