313 lines
11 KiB
C++
313 lines
11 KiB
C++
#include "testHarness.h"
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#include "vf/NetSession.h"
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#include <cstdint>
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#include <string>
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#include <vector>
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using namespace vf;
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namespace {
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struct Lcg {
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uint64_t state;
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explicit Lcg(uint64_t seed) : state(seed | 1ull) {}
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uint32_t next() {
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state = state * 6364136223846793005ull + 1442695040888963407ull;
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return static_cast<uint32_t>(state >> 32);
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}
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int range(int n) { return static_cast<int>(next() % static_cast<uint32_t>(n)); }
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};
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// Deterministic terrain in the chunk plane y = 0, so both ends have something
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// substantial to disagree about if replication is wrong.
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void buildTerrain(World& world, int columnsRadius) {
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Lcg rng(0x51ed270b);
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const Block palette[5] = {Block::Stone, Block::Dirt, Block::Grass, Block::Sand, Block::Gravel};
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for (int cx = -columnsRadius; cx <= columnsRadius; ++cx) {
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for (int cz = -columnsRadius; cz <= columnsRadius; ++cz) {
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Chunk& chunk = world.ensureChunk(Vec3i{cx, 0, cz});
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for (int x = 0; x < chunkSize; ++x) {
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for (int z = 0; z < chunkSize; ++z) {
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int height = 4 + rng.range(9);
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for (int y = 0; y < height; ++y)
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chunk.set(x, y, z, palette[rng.range(5)]);
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}
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}
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}
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}
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}
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// Canonical over the whole world: chunk coordinates are sorted before hashing,
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// so the digest does not inherit the hash map's iteration order.
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uint64_t worldDigest(const World& world, const std::vector<Vec3i>& coords) {
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ByteWriter stream;
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for (const Vec3i& coord : coords) {
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const Chunk* chunk = world.chunkAt(coord);
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if (!chunk) continue;
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stream.putU32(static_cast<uint32_t>(coord.x));
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stream.putU32(static_cast<uint32_t>(coord.y));
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stream.putU32(static_cast<uint32_t>(coord.z));
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for (Block block : chunk->raw()) stream.putU8(static_cast<uint8_t>(block));
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}
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return fnv1a64(stream.bytes().data(), stream.bytes().size());
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}
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std::vector<Vec3i> sortedCoords(const std::unordered_set<Vec3i, Vec3iHash>& set) {
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std::vector<Vec3i> coords(set.begin(), set.end());
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for (std::size_t i = 1; i < coords.size(); ++i) {
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Vec3i key = coords[i];
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std::size_t j = i;
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while (j > 0 && (coords[j - 1].y > key.y ||
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(coords[j - 1].y == key.y &&
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(coords[j - 1].z > key.z ||
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(coords[j - 1].z == key.z && coords[j - 1].x > key.x))))) {
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coords[j] = coords[j - 1];
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--j;
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}
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coords[j] = key;
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}
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return coords;
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}
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// Both ends of one connection, wired through a single loopback link.
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struct Pair {
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LoopbackLink link;
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Transport serverTransport;
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Transport clientTransport;
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NetSession server;
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NetSession client;
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World serverWorld;
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World clientWorld;
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ServerChunkSync sync;
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Pair(const LinkQuality& quality, const TransportConfig& transportConfig,
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const SessionConfig& sessionConfig)
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: link(quality),
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serverTransport(link, 0, transportConfig),
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clientTransport(link, 1, transportConfig),
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server(serverTransport, NetSession::Role::Server, sessionConfig),
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client(clientTransport, NetSession::Role::Client, sessionConfig) {
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server.attachWorld(serverWorld);
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server.attachChunkSync(sync);
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server.setEntityId(7);
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client.attachWorld(clientWorld);
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}
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void step(uint64_t tick) {
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server.receive(tick);
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server.send(tick);
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client.receive(tick);
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client.send(tick);
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}
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// Server edit: authoritative world, dirty feed, and this session's own
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// per-chunk work list all move together.
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void edit(int gx, int gy, int gz, Block block) {
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serverWorld.setBlock(gx, gy, gz, block);
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Vec3i coord{floorDiv(gx, chunkSize), floorDiv(gy, chunkSize), floorDiv(gz, chunkSize)};
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sync.markDirty(coord, floorMod(gx, chunkSize), floorMod(gy, chunkSize),
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floorMod(gz, chunkSize));
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server.markChunkDirty(coord);
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}
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void clearDirty() { sync.clearAll(); }
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};
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SessionConfig quietConfig() {
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SessionConfig config;
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config.viewRadius = 2;
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config.chunksPerTick = 3;
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config.keepAliveIntervalTicks = 20;
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config.keepAliveTimeoutTicks = 1000000;
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return config;
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}
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} // namespace
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VF_TEST(handshakeAndLoginCarryBothEndsOfTheSessionIntoThePlayPhase) {
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LinkQuality quality;
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quality.latencyTicks = 1;
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TransportConfig transportConfig;
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Pair pair(quality, transportConfig, quietConfig());
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CHECK(pair.server.phase() == SessionPhase::Handshake);
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CHECK(pair.client.phase() == SessionPhase::Handshake);
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pair.client.beginHandshake("vulp", 0x1111222233334444ull, 0x5555666677778888ull);
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CHECK(pair.client.phase() == SessionPhase::Login);
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for (uint64_t tick = 0; tick < 12; ++tick) pair.step(tick);
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CHECK(pair.server.phase() == SessionPhase::Play);
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CHECK(pair.client.phase() == SessionPhase::Play);
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CHECK(pair.server.playerName() == "vulp");
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CHECK_EQ(pair.server.uuidHigh(), 0x1111222233334444ull);
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CHECK_EQ(pair.client.entityId(), 7);
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CHECK(pair.server.disconnectReason().empty());
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}
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VF_TEST(aPlayPacketArrivingBeforeLoginEndsTheSessionWithAReasonInsteadOfCrashing) {
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LinkQuality quality;
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quality.latencyTicks = 1;
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TransportConfig transportConfig;
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Pair pair(quality, transportConfig, quietConfig());
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// A well-formed PlayerState sent straight at a server still in handshake.
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PlayerState early;
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early.x = 12.0f;
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early.y = 40.0f;
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early.z = -3.0f;
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early.health = 20.0f;
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PacketWriter body;
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early.encode(body);
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ByteWriter stream;
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writeFramed(stream, PacketId::PlayerState, body);
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pair.clientTransport.sendReliable(stream.bytes());
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for (uint64_t tick = 0; tick < 10; ++tick) pair.step(tick);
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CHECK(pair.server.phase() == SessionPhase::Disconnected);
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CHECK(pair.server.disconnectReason() == "packet out of phase");
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CHECK_EQ(pair.server.stats().packetsRejected, static_cast<uint64_t>(1));
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CHECK(!pair.server.timedOut());
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CHECK_EQ(pair.server.view().position.x, 0.0f);
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}
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VF_TEST(aJoinGameArrivingAfterTheClientIsAlreadyPlayingIsRejected) {
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LinkQuality quality;
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quality.latencyTicks = 1;
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TransportConfig transportConfig;
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Pair pair(quality, transportConfig, quietConfig());
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pair.client.beginHandshake("vulp", 1, 2);
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for (uint64_t tick = 0; tick < 10; ++tick) pair.step(tick);
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CHECK(pair.client.phase() == SessionPhase::Play);
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JoinGame again;
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again.entityId = 99;
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again.levelType = "default";
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PacketWriter body;
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again.encode(body);
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ByteWriter stream;
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writeFramed(stream, PacketId::JoinGame, body);
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pair.serverTransport.sendReliable(stream.bytes());
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for (uint64_t tick = 10; tick < 20; ++tick) pair.step(tick);
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CHECK(pair.client.phase() == SessionPhase::Disconnected);
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CHECK(pair.client.disconnectReason() == "packet out of phase");
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CHECK_EQ(pair.client.entityId(), 7);
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}
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VF_TEST(theServerDisconnectsAClientThatStopsAnsweringKeepAlive) {
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LinkQuality quality;
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quality.latencyTicks = 1;
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TransportConfig transportConfig;
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SessionConfig config = quietConfig();
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config.keepAliveIntervalTicks = 5;
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config.keepAliveTimeoutTicks = 30;
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Pair pair(quality, transportConfig, config);
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pair.client.beginHandshake("vulp", 1, 2);
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for (uint64_t tick = 0; tick < 60; ++tick) pair.step(tick);
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CHECK(pair.server.phase() == SessionPhase::Play);
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CHECK(pair.server.stats().keepAlivesSent > 5u);
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CHECK(!pair.server.timedOut());
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// The client goes silent: the server keeps ticking on its own.
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for (uint64_t tick = 60; tick < 130; ++tick) {
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pair.server.receive(tick);
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pair.server.send(tick);
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}
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CHECK(pair.server.phase() == SessionPhase::Disconnected);
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CHECK(pair.server.timedOut());
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CHECK(pair.server.disconnectReason() == "keep alive timeout");
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}
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VF_TEST(chunksAreStreamedNearestFirstAndNeverMoreThanTheTickBudget) {
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LinkQuality quality;
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quality.latencyTicks = 1;
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TransportConfig transportConfig;
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SessionConfig config = quietConfig();
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config.chunksPerTick = 2;
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Pair pair(quality, transportConfig, config);
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buildTerrain(pair.serverWorld, 3);
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pair.server.view().position = Vec3{8.0f, 8.0f, 8.0f};
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pair.client.beginHandshake("vulp", 1, 2);
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for (uint64_t tick = 0; tick < 6; ++tick) pair.step(tick);
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CHECK(pair.server.phase() == SessionPhase::Play);
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uint64_t afterFirstTicks = pair.server.stats().chunksSent;
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CHECK(afterFirstTicks > 0u);
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CHECK(afterFirstTicks <= 2u * 6u);
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// The chunk the player stands in must be among the first handful sent.
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CHECK(pair.server.view().hasChunk(Vec3i{0, 0, 0}));
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CHECK(!pair.server.view().hasChunk(Vec3i{2, 0, 2}));
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for (uint64_t tick = 6; tick < 60; ++tick) pair.step(tick);
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CHECK_EQ(pair.server.view().pendingCount(), static_cast<std::size_t>(0));
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// The sphere of radius 2 holds 33 chunk slots, only 13 of which exist in
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// the y = 0 plane, so exactly those get snapshots.
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CHECK_EQ(pair.server.stats().chunksSent, static_cast<uint64_t>(13));
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CHECK_EQ(pair.client.stats().chunksApplied, static_cast<uint64_t>(13));
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CHECK_EQ(pair.clientWorld.chunkCount(), static_cast<std::size_t>(13));
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}
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VF_TEST(manyChangesInOneChunkBecomeAMultiBlockChangeAndFewBecomeSingleBlockChanges) {
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LinkQuality quality;
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quality.latencyTicks = 1;
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TransportConfig transportConfig;
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SessionConfig config = quietConfig();
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config.multiBlockThreshold = 4;
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Pair pair(quality, transportConfig, config);
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buildTerrain(pair.serverWorld, 1);
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pair.client.beginHandshake("vulp", 1, 2);
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for (uint64_t tick = 0; tick < 40; ++tick) pair.step(tick);
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CHECK(pair.server.view().hasChunk(Vec3i{0, 0, 0}));
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for (int i = 0; i < 3; ++i) pair.edit(i, 14, 0, Block::Glowstone);
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pair.step(40);
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pair.clearDirty();
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for (uint64_t tick = 41; tick < 50; ++tick) pair.step(tick);
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CHECK_EQ(pair.server.stats().blockChangesSent, static_cast<uint64_t>(3));
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CHECK_EQ(pair.server.stats().multiBlockChangesSent, static_cast<uint64_t>(0));
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CHECK_EQ(pair.client.stats().blockChangesApplied, static_cast<uint64_t>(3));
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for (int i = 0; i < 9; ++i) pair.edit(i, 15, 0, Block::Obsidian);
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pair.step(50);
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pair.clearDirty();
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for (uint64_t tick = 51; tick < 60; ++tick) pair.step(tick);
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CHECK_EQ(pair.server.stats().blockChangesSent, static_cast<uint64_t>(3));
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CHECK_EQ(pair.server.stats().multiBlockChangesSent, static_cast<uint64_t>(1));
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CHECK_EQ(pair.client.stats().multiBlockChangesApplied, static_cast<uint64_t>(1));
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for (int i = 0; i < 9; ++i) CHECK(pair.clientWorld.blockAt(i, 15, 0) == Block::Obsidian);
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for (int i = 0; i < 3; ++i) CHECK(pair.clientWorld.blockAt(i, 14, 0) == Block::Glowstone);
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}
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VF_TEST(theClientWorldMirrorsTheServerByteForByteAcrossAnUnreliableLink) {
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LinkQuality quality;
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quality.lossPercent = 30;
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quality.duplicatePercent = 10;
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quality.reorderPercent = 25;
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quality.reorderExtraTicks = 4;
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quality.latencyTicks = 2;
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quality.seed = 0xabcdef0123456789ull;
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TransportConfig transportConfig;
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transportConfig.mtu = 512;
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transportConfig.retransmitTimeoutTicks = 10;
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transportConfig.sendWindow = 24;
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SessionConfig config = quietConfig();
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config.chunksPerTick = 2;
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config.multiBlockThreshold = 6;
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Pair pair(quality, transportConfig, config);
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buildTerrain(pair.serverWorld, 2);
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pair.server.view().position = Vec3{8.0f, 8.0f, 8.0f};
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pair.client.beginHandshake("vulp", 1, 2);
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