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ReSkate/Server/server_config.cpp
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AyeZeeBB e533dadccb Server: shed stale poses when behind, and send each pass on several threads 
A full server (about 120 players) slowed down at random until everyone lagged:
one pass a second, each taking over six seconds, 115% busy, and whole poses
going out by the thousand.

Why it stuck. After any stall the next pass had everything that arrived
meanwhile to pass on, to every player, so it took longer still. By then the
poses each update would have built on had gone stale, so poses went out whole,
ten times the size and more work again. Each pass carried the whole of the
last one's arrivals and the server never caught up.

Shedding. A pass normally reads one or two poses from each player. When more
than three of one player's are waiting, only the newest is passed on. Contact
effects are held to two packets a player a pass. Each pass then has a bounded
amount to do whatever the backlog, so the server catches up; players see the
others at a lower rate for a moment. The log says when it happens (at most
every 30 s) and `net` has a "shed while behind" count.

Threads. Building each player's update of everyone else was 80% of a pass. It
reads the other players and writes only that player's own state, so it is now
done for several players at once (worker_pool.h); the server's own counts and
the marks on whole poses are added up afterwards, and sends into the transport
are made one at a time. New setting network.threads: 0 (default) is one thread
for each processor but one, up to 8; 1 is the single thread as before. The
server says how many it uses when it starts.

Load test. Server/Test/server_load_tests.cpp drives the host with simulated
players over a transport that is not Steam's (built with the multiplayer tests
on Windows, not run by ctest). With 120 players at 20 TPS and 27 MB/s out, the
loop's share of one core went from about 50% on one thread to 26% on four and
22% on eight, and every player was sent byte for byte the same on 1, 2, 4 and
8 threads. A simulated 3 s stall shed about 7,000 poses, took one 169 ms pass
to recover and lost nobody.

The test's transport has none of Steam's send cost, so a real server's loop
sits higher than these figures. Receiving, choosing who is sent which pose and
the sends themselves still run on one thread.
2026-10-09 16:00:02 -05:00

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#include "server_config.h"
#include "Engine/Core/Json/json.h"
#include "Engine/Core/Platform/path_text.h"
#include "Extension/Multiplayer/Net/protocol.h"
#include "Engine/Game/World/world_names.h"
#include <algorithm>
#include <initializer_list>
#include <array>
#include <cctype>
#include <fstream>
#include <sstream>
#include <stdexcept>
namespace dingosdk::server {
namespace {
std::string placement_text(ObjectPlacement policy) {
return policy == ObjectPlacement::everyone ? "everyone" : policy == ObjectPlacement::host_only ? "admins" : "nobody";
}
// The config file as it is written: sections, and the settings in each, in the order an owner
// reads them (a Json object alone would put them in alphabetical order).
struct Layout {
std::vector<std::string> names;
std::vector<Layout> members;
Json value;
bool leaf{};
Layout &section(std::string name) {
names.push_back(std::move(name));
return members.emplace_back();
}
void set(std::string name, Json json) {
names.push_back(std::move(name));
auto &member = members.emplace_back();
member.value = std::move(json);
member.leaf = true;
}
};
void write(std::string &out, const Layout &layout, std::size_t depth) {
const std::string inner(2 * (depth + 1), ' ');
out += "{\n";
for (std::size_t i = 0; i < layout.names.size(); ++i) {
out += inner + Json(layout.names[i]).dump() + ": ";
if (layout.members[i].leaf) {
// A list or an object of its own spans lines: each goes in by this setting's depth.
for (const char c : layout.members[i].value.dump(2)) {
out += c;
if (c == '\n') out += inner;
}
} else {
write(out, layout.members[i], depth + 1);
}
out += i + 1 < layout.names.size() ? ",\n" : "\n";
}
out += std::string(2 * depth, ' ') + "}";
}
Layout layout(const ServerConfig &c) {
// SteamID64s are written as strings: JSON readers often lose 64-bit precision.
const auto ids = [](const std::vector<std::uint64_t> &list) {
auto out = Json::array();
for (const auto id : list) out.push_back(std::to_string(id));
return out;
};
Layout root;
auto &server = root.section("server");
server.set("name", c.name);
server.set("password", c.password);
server.set("welcome_message", c.welcome);
server.set("chat_color", c.chat_color);
server.set("chat_text_color", c.chat_text_color);
server.set("listed", c.listed);
server.set("max_players", c.max_players);
server.set("port", static_cast<unsigned>(c.port));
server.set("query_port", static_cast<unsigned>(c.query_port));
server.set("steam_token", c.steam_token);
server.set("auto_update", c.auto_update);
server.set("activity_log", c.activity_log);
auto &access = root.section("access");
access.set("admins", ids(c.admins));
access.set("reserved_players_slots", ids(c.reserved));
access.set("use_global_bans", c.global_bans);
auto &maps = root.section("maps");
maps.set("map", c.map);
auto pool = Json::array();
for (const auto &map : c.map_pool) pool.push_back(map);
maps.set("pool", std::move(pool));
maps.set("rotation_minutes", c.map_rotation);
auto parks = Json::object();
for (unsigned lot = 0; lot < park_lots.size(); ++lot) parks[park_lots[lot].key] = c.parks[lot];
maps.set("parks", std::move(parks));
maps.set("world_layer_sync", c.world_layer_sync);
auto layers = Json::object();
for (const auto &[key, mode] : c.layers) layers[key] = mode;
maps.set("layers", std::move(layers));
auto &players = root.section("players");
players.set("allow_boosts", c.boosts);
players.set("allow_no_bail", c.no_bail);
players.set("allow_noclip", c.noclip);
players.set("allow_parties", c.parties);
players.set("party_size", c.party_size);
players.set("afk_kick_minutes", c.afk_kick);
players.set("allow_voice_chat", c.voice_chat);
players.set("voice_range", static_cast<double>(c.voice_range));
players.set("object_placement", placement_text(c.object_placement));
players.set("object_limit", c.object_limit);
players.set("allow_object_scaling", c.object_scaling);
players.set("sync_effects", c.sync_effects);
players.set("announce_throwdowns", c.announce_throwdowns);
auto &anti_cheat = root.section("anti_cheat");
anti_cheat.set("speed_hack", c.speed_check);
anti_cheat.set("modified_scoring", c.score_check);
auto allowed = Json::array();
for (const auto fingerprint : c.score_allow) allowed.push_back(scoring_text(fingerprint));
anti_cheat.set("allowed_scoring_mods", std::move(allowed));
anti_cheat.set("enforce_tuning", c.enforce_tuning);
anti_cheat.set("bone_scale_limit", c.bone_scale_limit);
auto &network = root.section("network");
network.set("use_steam_relay", c.use_steam_relay);
network.set("send_rate", c.send_rate);
network.set("crowd_budget", c.crowd_budget);
network.set("pack_ms", c.pack_ms);
network.set("threads", c.threads);
network.set("finger_distance", c.finger_distance);
auto &distances = network.section("distances");
distances.set("full_rate_return", c.distances.full_rate_return);
distances.set("half_rate_start", c.distances.half_rate_start);
distances.set("half_rate_return", c.distances.half_rate_return);
distances.set("low_rate_start", c.distances.low_rate_start);
network.set("steam_debug", c.steam_debug);
auto &votes = root.section("votes");
const auto vote = [&](const char *name, const VoteSetting &v) {
auto &item = votes.section(name);
item.set("enabled", v.enabled);
item.set("percent", v.percent);
};
vote("map", c.votes.map);
vote("kick", c.votes.kick);
vote("time_of_day", c.votes.time);
votes.set("seconds", c.votes.seconds);
votes.set("cooldown_seconds", c.votes.cooldown);
return root;
}
// Bans have a file of their own, beside the config.
Json bans_json(const ServerConfig &c) {
auto bans = Json::array();
for (const auto &ban : c.bans) {
auto row = Json::object();
row["id"] = std::to_string(ban.id);
row["name"] = ban.name;
row["added"] = ban.added;
bans.push_back(std::move(row));
}
return bans;
}
void write_file(const std::filesystem::path &file, const std::string &text) {
if (file.has_parent_path()) std::filesystem::create_directories(file.parent_path());
const auto temporary = std::filesystem::path(file).concat(".tmp");
{
std::ofstream out(temporary, std::ios::binary | std::ios::trunc);
out << text << '\n';
if (!out) throw std::runtime_error("Cannot write " + path_utf8(temporary));
}
std::filesystem::rename(temporary, file);
}
std::uint64_t steam_id(const Json &value) {
if (value.is_string()) return std::stoull(value.string());
return value.get<std::uint64_t>();
}
} // namespace
ServerConfig load_config(const std::filesystem::path &file, std::vector<std::string> *added) {
ServerConfig c;
c.file = file;
if (!std::filesystem::exists(file)) {
save_config(c);
return c;
}
std::stringstream text;
{
// Closed before any write-back: Windows cannot replace a file that is still open.
std::ifstream in(file, std::ios::binary);
text << in.rdbuf();
}
const auto root = Json::parse(text.str());
if (!root.is_object()) throw std::runtime_error("The server config must be a JSON object.");
// A setting is in its section under its name. A config from before the sections has it at the
// top, under that name or an older one: it is read from there, and the file is written back
// as it is laid out now. A setting found nowhere is new, and the owner is told of it.
std::vector<std::string> missing;
bool moved{};
using Old = std::initializer_list<std::string_view>;
const auto find = [&](std::string_view section, std::string_view key, Old old = {}) -> const Json * {
if (root.contains(section) && root.at(section).is_object() && root.at(section).contains(key)) return &root.at(section).at(key);
if (root.contains(key) && !root.at(key).is_null() && key != "votes") {
moved = true;
return &root.at(key);
}
for (const auto name : old)
if (root.contains(name)) {
moved = true;
return &root.at(name);
}
missing.push_back(std::string(section) + "." + std::string(key));
return nullptr;
};
const auto get = [&]<typename T>(std::string_view section, std::string_view key, T fallback, Old old = {}) {
const auto *found = find(section, key, old);
return found ? found->template get<T>() : fallback;
};
c.name = get("server", "name", c.name);
c.password = get("server", "password", c.password);
c.welcome = get("server", "welcome_message", c.welcome, {"welcome"});
c.chat_color = get("server", "chat_color", c.chat_color);
c.chat_text_color = get("server", "chat_text_color", c.chat_text_color);
c.listed = get("server", "listed", c.listed);
c.max_players = get("server", "max_players", c.max_players);
// Checked here, not in config_error: once narrowed, 70000 is just port 4464, and the
// next save would write that over the owner's typo.
const auto read_port = [&](const char *key, std::uint16_t fallback) {
const auto value = get("server", key, static_cast<unsigned>(fallback));
if (value < 1 || value > 65535) throw std::runtime_error(std::string(key) + " must be 1 to 65535.");
return static_cast<std::uint16_t>(value);
};
c.port = read_port("port", c.port);
c.query_port = read_port("query_port", c.query_port);
c.steam_token = get("server", "steam_token", c.steam_token);
c.auto_update = get("server", "auto_update", c.auto_update);
c.activity_log = get("server", "activity_log", c.activity_log);
if (const auto *admins = find("access", "admins"); admins && admins->is_array())
for (const auto &id : *admins) c.admins.push_back(steam_id(id));
if (const auto *reserved = find("access", "reserved_players_slots", {"reserved"}); reserved && reserved->is_array())
for (const auto &id : *reserved) c.reserved.push_back(steam_id(id));
c.global_bans = get("access", "use_global_bans", c.global_bans, {"global_bans"});
c.map = get("maps", "map", c.map);
if (const auto *pool = find("maps", "pool", {"map_pool"}); pool && pool->is_array())
for (const auto &map : *pool)
if (map.is_string() && !map.string().empty()) c.map_pool.push_back(map.string());
c.map_rotation = std::min(get("maps", "rotation_minutes", c.map_rotation, {"map_rotation_minutes"}), max_map_rotation);
if (const auto *parks = find("maps", "parks"); parks && parks->is_object())
for (unsigned lot = 0; lot < park_lots.size(); ++lot) c.parks[lot] = parks->value(park_lots[lot].key, c.parks[lot]);
c.world_layer_sync = get("maps", "world_layer_sync", c.world_layer_sync);
if (const auto *layers = find("maps", "layers"); layers && layers->is_object())
for (const auto &[key, mode] : layers->items())
if (mode.is_string()) c.layers[key] = mode.string();
c.boosts = get("players", "allow_boosts", c.boosts, {"boosts"});
c.no_bail = get("players", "allow_no_bail", c.no_bail, {"no_bail"});
c.noclip = get("players", "allow_noclip", c.noclip, {"noclip"});
c.parties = get("players", "allow_parties", c.parties, {"parties"});
c.party_size = std::clamp(get("players", "party_size", c.party_size), 2U, 8U);
c.afk_kick = get("players", "afk_kick_minutes", c.afk_kick);
c.voice_chat = get("players", "allow_voice_chat", c.voice_chat, {"voice_chat"});
c.voice_range = get("players", "voice_range", c.voice_range);
const auto placement = get("players", "object_placement", placement_text(c.object_placement));
// On a dedicated server the protocol's "host only" means its admins.
c.object_placement = placement == "nobody" ? ObjectPlacement::nobody
: placement == "admins" || placement == "host" ? ObjectPlacement::host_only : ObjectPlacement::everyone;
c.object_limit = get("players", "object_limit", c.object_limit);
c.object_scaling = get("players", "allow_object_scaling", c.object_scaling);
c.sync_effects = get("players", "sync_effects", c.sync_effects);
c.announce_throwdowns = get("players", "announce_throwdowns", c.announce_throwdowns);
c.speed_check = get("anti_cheat", "speed_hack", c.speed_check, {"speed_check"});
if (c.speed_check != "off" && c.speed_check != "warn" && c.speed_check != "kick") c.speed_check = "warn";
c.score_check = get("anti_cheat", "modified_scoring", c.score_check, {"score_check"});
if (c.score_check != "off" && c.score_check != "warn" && c.score_check != "kick") c.score_check = "warn";
if (const auto *allowed = find("anti_cheat", "allowed_scoring_mods", {"score_allow"}); allowed && allowed->is_array())
for (const auto &value : *allowed)
if (value.is_string())
if (const auto fingerprint = parse_scoring(value.string())) c.score_allow.push_back(*fingerprint);
c.enforce_tuning = get("anti_cheat", "enforce_tuning", c.enforce_tuning);
c.bone_scale_limit = get("anti_cheat", "bone_scale_limit", c.bone_scale_limit);
c.use_steam_relay = get("network", "use_steam_relay", c.use_steam_relay);
c.send_rate = get("network", "send_rate", c.send_rate);
c.crowd_budget = get("network", "crowd_budget", c.crowd_budget);
c.pack_ms = get("network", "pack_ms", c.pack_ms);
c.threads = get("network", "threads", c.threads);
c.finger_distance = get("network", "finger_distance", c.finger_distance);
if (const auto *d = find("network", "distances"); d && d->is_object()) {
c.distances.full_rate_return = d->value("full_rate_return", c.distances.full_rate_return);
c.distances.half_rate_start = d->value("half_rate_start", c.distances.half_rate_start);
c.distances.half_rate_return = d->value("half_rate_return", c.distances.half_rate_return);
c.distances.low_rate_start = d->value("low_rate_start", c.distances.low_rate_start);
}
c.steam_debug = get("network", "steam_debug", c.steam_debug);
// Votes were a section from the start.
const Json no_votes = Json::object();
const auto &votes = root.contains("votes") && root.at("votes").is_object() ? root.at("votes") : no_votes;
const auto read_vote = [&](const char *key, VoteSetting &v) {
if (!votes.contains(key) || !votes.at(key).is_object()) return missing.push_back(std::string("votes.") + key);
const auto &item = votes.at(key);
v.enabled = item.value("enabled", v.enabled);
v.percent = std::clamp(item.value("percent", v.percent), 1U, 100U);
};
read_vote("map", c.votes.map);
read_vote("kick", c.votes.kick);
read_vote("time_of_day", c.votes.time);
if (!votes.contains("seconds")) missing.push_back("votes.seconds");
if (!votes.contains("cooldown_seconds")) missing.push_back("votes.cooldown_seconds");
c.votes.seconds = std::clamp(votes.value("seconds", c.votes.seconds), 10U, 300U);
c.votes.cooldown = std::clamp(votes.value("cooldown_seconds", c.votes.cooldown), 0U, 3600U);
const auto read_bans = [&](const Json &rows) {
if (!rows.is_array()) throw std::runtime_error("The bans must be a JSON list.");
for (const auto &row : rows) {
const auto id = steam_id(row.at("id"));
if (std::none_of(c.bans.begin(), c.bans.end(), [&](const auto &ban) { return ban.id == id; }))
c.bans.push_back({id, row.value("name", std::string{}), row.value("added", std::int64_t{})});
}
};
if (const auto bans = bans_file(c); std::filesystem::exists(bans)) {
std::stringstream held;
{
std::ifstream in(bans, std::ios::binary);
held << in.rdbuf();
}
try {
read_bans(Json::parse(held.str()));
} catch (const std::exception &e) {
// Never started without its bans because their file has a typo in it.
throw std::runtime_error("Cannot read " + path_utf8(bans) + ": " + e.what());
}
}
// A config from an older version holds the bans itself: they are moved to their own file.
const bool bans_moved = root.contains("bans");
if (bans_moved) read_bans(root.at("bans"));
// New settings, an older layout, or settings that are no longer any: the file is written
// as it is now, so owners see what there is.
const bool gone = root.contains("tps") || root.contains("reserved_slots") || root.contains("relay_everything") ||
(root.contains("network") && root.at("network").contains("relay_everything"));
if (!missing.empty() || moved || bans_moved || gone) {
save_config(c);
if (added) *added = std::move(missing);
}
return c;
}
std::filesystem::path bans_file(const ServerConfig &c) { return c.file.parent_path() / "data" / "bans.json"; }
void save_config(const ServerConfig &c) {
// The bans first: a config that held them is only rewritten without them once they are safe.
write_file(bans_file(c), bans_json(c).dump(2));
std::string text;
write(text, layout(c), 0);
write_file(c.file, text);
}
std::string scoring_text(std::uint64_t fingerprint) {
static constexpr char digits[] = "0123456789abcdef";
std::string text(16, '0');
for (int i = 15; i >= 0; --i, fingerprint >>= 4) text[static_cast<std::size_t>(i)] = digits[fingerprint & 15];
return text;
}
std::optional<std::uint64_t> parse_scoring(std::string_view text) {
if (text.empty() || text.size() > 16) return std::nullopt;
std::uint64_t value{};
for (const auto c : text) {
const auto digit = c >= '0' && c <= '9' ? c - '0' : c >= 'a' && c <= 'f' ? c - 'a' + 10 : c >= 'A' && c <= 'F' ? c - 'A' + 10 : -1;
if (digit < 0) return std::nullopt;
value = value << 4 | static_cast<std::uint64_t>(digit);
}
if (!value) return std::nullopt;
return value;
}
std::size_t extra_slots(const ServerConfig &config) noexcept {
// (An admin who is also listed has one slot, not two.)
std::size_t slots = config.reserved.size();
for (const auto id : config.admins)
if (std::find(config.reserved.begin(), config.reserved.end(), id) == config.reserved.end()) ++slots;
// Never more players than a session can hold, the server itself being one of them.
const std::size_t room = multiplayer::max_players - 1;
return config.max_players >= room ? 0 : std::min<std::size_t>(slots, room - config.max_players);
}
bool may_join(const ServerConfig &config, std::uint64_t id, std::size_t on) noexcept {
if (on < config.max_players) return true;
const auto listed = [&](const std::vector<std::uint64_t> &ids) { return std::find(ids.begin(), ids.end(), id) != ids.end(); };
return (listed(config.reserved) || listed(config.admins)) && on < config.max_players + extra_slots(config);
}
std::optional<std::uint32_t> parse_colour(std::string_view text) noexcept {
if (!text.empty() && text.front() == '#') text.remove_prefix(1);
if (text.size() != 6) return std::nullopt;
std::uint32_t rgb{};
for (const char c : text) {
const int digit = c >= '0' && c <= '9' ? c - '0' : c >= 'a' && c <= 'f' ? c - 'a' + 10 : c >= 'A' && c <= 'F' ? c - 'A' + 10 : -1;
if (digit < 0) return std::nullopt;
rgb = rgb << 4 | static_cast<std::uint32_t>(digit);
}
// Written red first; held with red lowest and opaque.
return 0xff000000U | (rgb & 0xff) << 16 | (rgb & 0xff00) | rgb >> 16;
}
std::string config_error(const ServerConfig &c) {
using namespace multiplayer;
if (!parse_colour(c.chat_color)) return "chat_color must be a colour like #8E5CFF.";
if (c.afk_kick > 1440) return "afk_kick_minutes must be 0 (never) to 1440.";
if (!parse_colour(c.chat_text_color)) return "chat_text_color must be a colour like #D9C8FF.";
if (!valid_server_name(c.name)) return std::string("name must be ") + server_name_rule + ".";
for (const auto id : c.reserved)
if (!individual_steam_id(id)) return "reserved_players_slots must be SteamID64s (17 digits starting 7656119).";
if (c.reserved.size() > 1024) return "reserved_players_slots holds at most 1024 players.";
if (c.send_rate < 128 || c.send_rate > 16384) return "send_rate must be 128 to 16384 (KB/s for each player).";
if (c.bone_scale_limit != 0 && !(c.bone_scale_limit >= 1.f && c.bone_scale_limit <= 8.f))
return "bone_scale_limit must be 0 (no limit) or 1 to 8 (1: no resized body parts at all).";
if (c.pack_ms > 50) return "pack_ms must be 0 (off) to 50.";
if (c.threads > 32) return "threads must be 0 (one for each processor but one) to 32.";
if (c.finger_distance > 10000) return "finger_distance must be 0 (fingers always sent) to 10000.";
if (!valid_crowd_budget(c.crowd_budget))
return "crowd_budget must be 0 (no limit) or " + std::to_string(min_crowd_budget) + " to " +
std::to_string(max_crowd_budget) + ".";
if (c.steam_token.size() > 64 || !std::all_of(c.steam_token.begin(), c.steam_token.end(), [](unsigned char ch) { return std::isalnum(ch); }))
return "steam_token must be a game server login token (letters and digits), or empty to sign in anonymously.";
if (c.map.empty() || !valid_map_destination(map_destination(c.map)) || !installed_map(c.map))
return "map \"" + c.map + "\" is not a map this server has. Use a name like \"San Vansterdam\", or put the map's mod "
"folder in Mods next to the server.";
for (const auto &map : c.map_pool)
if (!find_level(map) || !valid_map_destination(map_destination(map)))
return "map_pool: \"" + map + "\" is not a single known map. Use names like \"Isle of Grom\", or put the "
"map's mod folder in Mods next to the server.";
if (c.max_players < 1 || c.max_players + 1 > max_players)
return "max_players must be 1 to " + std::to_string(max_players - 1) + ".";
if (c.password.size() > 64) return "password must be at most 64 characters.";
if (!c.welcome.empty() && !valid_chat_text(c.welcome)) return "welcome must be one chat line (at most 200 bytes).";
if (c.tps != dedicated_tps) return "tps is " + std::to_string(dedicated_tps) + " on dedicated servers.";
if (!valid_voice_range(c.voice_range)) return "voice_range must be 50 to 1000.";
if (!valid_object_limit(c.object_limit)) return "object_limit must be 0 (no limit) to " + std::to_string(max_object_limit) + ".";
if (!c.distances.valid()) return "distances must be ordered: full_rate_return < half_rate_start <= half_rate_return < low_rate_start <= 10000.";
for (unsigned lot = 0; lot < park_lots.size(); ++lot)
if (c.parks[lot].empty() || !valid_park(lot, c.parks[lot]))
return "parks." + std::string(park_lots[lot].key) + " is not a park layout (e.g. skatepark_01, or empty).";
if (!c.port || !c.query_port || c.port == c.query_port) return "port and query_port must differ.";
for (const auto id : c.admins)
if (!individual_steam_id(id)) return "admins must be SteamID64s (17 digits starting 7656119).";
return {};
}
namespace {
constexpr std::string_view root_level = "Levels/Game/DingoLevel_Root/DingoLevel_Root";
std::string folded(std::string_view text) {
std::string result(text);
for (auto &c : result) {
if (c >= 'A' && c <= 'Z') c = static_cast<char>(c + 32);
if (c == '\\') c = '/';
}
return result;
}
bool same(std::string_view a, std::string_view b) { return folded(a) == folded(b); }
bool starts(std::string_view text, std::string_view prefix) { return folded(text).starts_with(folded(prefix)); }
std::vector<ServerLevel> &level_list() {
static std::vector<ServerLevel> value;
return value;
}
} // namespace
std::vector<std::string> load_levels(const std::filesystem::path &mods) {
auto &list = level_list();
list.clear();
// The retail maps players can skate together; the game names them the same way.
for (const char *asset : {"Levels/Game/BAM_LevelRoot/BAM_LevelRoot",
"Levels/Game/DingoLevel_Isle_of_Grom/DingoLevel_Isle_of_Grom",
"Levels/Game/DingoLevel_MPR/DingoLevel_MPR",
"Levels/Game/DingoLevel_FTUE_Island/DingoLevel_FTUE_Island",
"Levels/Game/DingoLevel_SDM/DingoLevel_SDM_Int_001/DingoLevel_SDM_Int_001",
"Levels/Game/DingoLevel_SDM/DingoLevel_SDM_Int_002/DingoLevel_SDM_Int_002"})
list.push_back({asset, world_level_name(asset)});
std::vector<std::string> problems;
std::error_code error;
if (!std::filesystem::is_directory(mods, error)) return problems;
for (const auto &entry : std::filesystem::directory_iterator(mods, error)) {
const auto manifest = entry.path() / "reskate-levels.json";
if (!entry.is_directory() || !std::filesystem::exists(manifest)) continue;
try {
std::ifstream in(manifest, std::ios::binary);
std::stringstream text;
text << in.rdbuf();
const auto root = Json::parse(text.str());
for (const auto &level : root.at("levels")) {
const auto asset = level.at("asset").string();
const auto name = level.value("displayName", world_level_name(asset));
if (std::none_of(list.begin(), list.end(), [&](const auto &l) { return same(l.asset, asset); }))
list.push_back({asset, name.empty() ? world_level_name(asset) : name});
}
} catch (const std::exception &e) {
problems.push_back(entry.path().filename().string() + ": " + e.what());
}
}
return problems;
}
const std::vector<ServerLevel> &levels() { return level_list(); }
const ServerLevel *find_level(std::string_view map) {
if (map.empty()) return nullptr;
for (const auto &level : level_list())
if (same(level.asset, map)) return &level;
for (const bool exact : {true, false}) {
const ServerLevel *result{};
for (const auto &level : level_list()) {
const auto alias = world_level_short_name(level.asset);
if (exact ? (same(level.name, map) || same(alias, map))
: (starts(level.name, map) || starts(alias, map) || starts(level.asset, map))) {
if (result) return nullptr; // ambiguous
result = &level;
}
}
if (result) return result;
}
return nullptr;
}
std::uint32_t direct_ipv4(std::string_view text) noexcept {
std::uint32_t address{};
unsigned parts{};
while (!text.empty() && parts < 4) {
const auto dot = text.find('.');
const auto part = text.substr(0, dot);
unsigned value{};
const auto parsed = std::from_chars(part.data(), part.data() + part.size(), value);
if (part.empty() || part.size() > 3 || parsed.ec != std::errc{} || parsed.ptr != part.data() + part.size() || value > 255) return 0;
address = (address << 8) | value;
++parts;
text = dot == std::string_view::npos ? std::string_view{} : text.substr(dot + 1);
if (dot != std::string_view::npos && text.empty()) return 0; // a trailing dot
}
return parts == 4 && text.empty() ? address : 0;
}
bool installed_map(std::string_view map) {
const auto destination = map_destination(map);
const auto asset = world_destination_asset(destination);
return !asset.empty() && std::any_of(level_list().begin(), level_list().end(), [&](const auto &level) { return same(level.asset, asset); });
}
std::string map_destination(std::string_view map) {
if (map.find('|') != std::string_view::npos) return std::string(map);
if (const auto *level = find_level(map)) return std::string(root_level) + "|" + level->asset;
// A level path the server has no manifest for: players with that map can still load it.
if (map.find('/') != std::string_view::npos) return std::string(root_level) + "|" + std::string(map);
return {};
}
std::string map_setting(std::string_view map) {
std::string_view level = map;
if (const auto split = map.find('|'); split != std::string_view::npos) {
const auto root = map.substr(0, split), detached = map.substr(split + 1);
// Anything not loaded into the usual root level keeps its full destination.
if (!same(root, root_level) || detached.empty()) return std::string(map);
level = detached;
}
if (const auto *known = find_level(level)) return known->name;
return std::string(level);
}
std::string map_label(std::string_view map) {
if (const auto *level = find_level(map)) return level->name;
return world_level_name(world_destination_asset(map_destination(map)));
}
std::vector<const ServerLevel *> pool_levels(const ServerConfig &config) {
std::vector<const ServerLevel *> pool;
const auto add = [&](const ServerLevel *level) {
if (level && multiplayer::valid_map_destination(map_destination(level->asset)) &&
std::find(pool.begin(), pool.end(), level) == pool.end())
pool.push_back(level);
};
if (config.map_pool.empty())
for (const auto &level : level_list()) add(&level);
for (const auto &map : config.map_pool) add(find_level(map));
return pool;
}
bool in_map_pool(const ServerConfig &config, std::string_view map) {
if (config.map_pool.empty()) return true;
const auto pool = pool_levels(config);
const auto *level = find_level(map);
return level && std::find(pool.begin(), pool.end(), level) != pool.end();
}
const ServerLevel *next_pool_map(const ServerConfig &config, std::string_view map) {
const auto pool = pool_levels(config);
const auto *current = find_level(map);
const auto at = static_cast<std::size_t>(std::find(pool.begin(), pool.end(), current) - pool.begin());
for (std::size_t step = 1; step <= pool.size(); ++step) {
const auto *next = at == pool.size() ? pool[step - 1] : pool[(at + step) % pool.size()];
if (next != current) return next;
}
return nullptr;
}
} // namespace dingosdk::server
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