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draconisplusplus/src/os/linux.cpp
pupbrained 350e3a13db
weh
2025-04-26 22:38:55 -04:00

513 lines
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#ifdef __linux__
// clang-format off
#include <dbus-cxx.h> // needs to be at top for Success/None
// clang-format on
#include <cstring>
#include <fstream>
#include <sys/socket.h>
#include <sys/statvfs.h>
#include <sys/sysinfo.h>
#include <sys/utsname.h>
#include <system_error>
#include <unistd.h>
#include <wayland-client.h>
#include <xcb/xcb.h>
#include "os.h"
#include "src/os/linux/display_guards.h"
#include "src/util/macros.h"
#include "src/util/types.h"
using namespace std::string_view_literals;
namespace {
fn MakeOsErrorFromDBus(const DBus::Error& err) -> OsError {
String name = err.name();
if (name == "org.freedesktop.DBus.Error.ServiceUnknown" || name == "org.freedesktop.DBus.Error.NameHasNoOwner")
return OsError { OsErrorCode::NotFound, std::format("DBus service/name not found: {}", err.message()) };
if (name == "org.freedesktop.DBus.Error.NoReply" || name == "org.freedesktop.DBus.Error.Timeout")
return OsError { OsErrorCode::Timeout, std::format("DBus timeout/no reply: {}", err.message()) };
if (name == "org.freedesktop.DBus.Error.AccessDenied")
return OsError { OsErrorCode::PermissionDenied, std::format("DBus access denied: {}", err.message()) };
return OsError { OsErrorCode::PlatformSpecific, std::format("DBus error: {} - {}", name, err.message()) };
}
fn MakeOsErrorFromErrno(const String& context = "") -> OsError {
const i32 errNo = errno;
const String msg = std::system_category().message(errNo);
const String fullMsg = context.empty() ? msg : std::format("{}: {}", context, msg);
switch (errNo) {
case EACCES:
case EPERM: return OsError { OsErrorCode::PermissionDenied, fullMsg };
case ENOENT: return OsError { OsErrorCode::NotFound, fullMsg };
case ETIMEDOUT: return OsError { OsErrorCode::Timeout, fullMsg };
case ENOTSUP: return OsError { OsErrorCode::NotSupported, fullMsg };
case EIO: return OsError { OsErrorCode::IoError, fullMsg };
case ECONNREFUSED:
case ENETDOWN:
case ENETUNREACH: return OsError { OsErrorCode::NetworkError, fullMsg };
default: return OsError { OsErrorCode::PlatformSpecific, fullMsg };
}
}
fn GetX11WindowManager() -> Result<String, OsError> {
using os::linux::XcbReplyGuard;
using os::linux::XorgDisplayGuard;
const XorgDisplayGuard conn;
if (!conn)
if (const i32 err = xcb_connection_has_error(conn.get()); !conn || err != 0)
return Err(
OsError {
OsErrorCode::ApiUnavailable,
[&] -> String {
switch (err) {
case 0: return "Connection object invalid, but no specific XCB error code";
case XCB_CONN_ERROR: return "Stream/Socket/Pipe Error";
case XCB_CONN_CLOSED_EXT_NOTSUPPORTED: return "Closed: Extension Not Supported";
case XCB_CONN_CLOSED_MEM_INSUFFICIENT: return "Closed: Insufficient Memory";
case XCB_CONN_CLOSED_REQ_LEN_EXCEED: return "Closed: Request Length Exceeded";
case XCB_CONN_CLOSED_PARSE_ERR: return "Closed: Display String Parse Error";
case XCB_CONN_CLOSED_INVALID_SCREEN: return "Closed: Invalid Screen";
case XCB_CONN_CLOSED_FDPASSING_FAILED: return "Closed: FD Passing Failed";
default: return std::format("Unknown Error Code ({})", err);
}
}(),
}
);
fn internAtom = [&conn](const StringView name) -> Result<xcb_atom_t, OsError> {
const XcbReplyGuard<xcb_intern_atom_reply_t> reply(xcb_intern_atom_reply(
conn.get(), xcb_intern_atom(conn.get(), 0, static_cast<uint16_t>(name.size()), name.data()), nullptr
));
if (!reply)
return Err(
OsError { OsErrorCode::PlatformSpecific, std::format("Failed to get X11 atom reply for '{}'", name) }
);
return reply->atom;
};
const Result<xcb_atom_t, OsError> supportingWmCheckAtom = internAtom("_NET_SUPPORTING_WM_CHECK");
const Result<xcb_atom_t, OsError> wmNameAtom = internAtom("_NET_WM_NAME");
const Result<xcb_atom_t, OsError> utf8StringAtom = internAtom("UTF8_STRING");
if (!supportingWmCheckAtom || !wmNameAtom || !utf8StringAtom) {
if (!supportingWmCheckAtom)
ERROR_LOG("Failed to get _NET_SUPPORTING_WM_CHECK atom");
if (!wmNameAtom)
ERROR_LOG("Failed to get _NET_WM_NAME atom");
if (!utf8StringAtom)
ERROR_LOG("Failed to get UTF8_STRING atom");
return Err(OsError { OsErrorCode::PlatformSpecific, "Failed to get X11 atoms" });
}
const XcbReplyGuard<xcb_get_property_reply_t> wmWindowReply(xcb_get_property_reply(
conn.get(),
xcb_get_property(conn.get(), 0, conn.rootScreen()->root, *supportingWmCheckAtom, XCB_ATOM_WINDOW, 0, 1),
nullptr
));
if (!wmWindowReply || wmWindowReply->type != XCB_ATOM_WINDOW || wmWindowReply->format != 32 ||
xcb_get_property_value_length(wmWindowReply.get()) == 0)
return Err(OsError { OsErrorCode::NotFound, "Failed to get _NET_SUPPORTING_WM_CHECK property" });
const xcb_window_t wmRootWindow = *static_cast<xcb_window_t*>(xcb_get_property_value(wmWindowReply.get()));
const XcbReplyGuard<xcb_get_property_reply_t> wmNameReply(xcb_get_property_reply(
conn.get(), xcb_get_property(conn.get(), 0, wmRootWindow, *wmNameAtom, *utf8StringAtom, 0, 1024), nullptr
));
if (!wmNameReply || wmNameReply->type != *utf8StringAtom || xcb_get_property_value_length(wmNameReply.get()) == 0)
return Err(OsError { OsErrorCode::NotFound, "Failed to get _NET_WM_NAME property" });
const char* nameData = static_cast<const char*>(xcb_get_property_value(wmNameReply.get()));
const usize length = xcb_get_property_value_length(wmNameReply.get());
return String(nameData, length);
}
fn GetWaylandCompositor() -> Result<String, OsError> {
using os::linux::WaylandDisplayGuard;
const WaylandDisplayGuard display;
if (!display)
return Err(OsError { OsErrorCode::NotFound, "Failed to connect to display (is Wayland running?)" });
const i32 fileDescriptor = display.fd();
if (fileDescriptor < 0)
return Err(OsError { OsErrorCode::ApiUnavailable, "Failed to get Wayland file descriptor" });
ucred cred;
socklen_t len = sizeof(cred);
if (getsockopt(fileDescriptor, SOL_SOCKET, SO_PEERCRED, &cred, &len) == -1)
return Err(MakeOsErrorFromErrno("Failed to get socket credentials (SO_PEERCRED)"));
Array<char, 128> exeLinkPathBuf;
auto [out, size] = std::format_to_n(exeLinkPathBuf.data(), exeLinkPathBuf.size() - 1, "/proc/{}/exe", cred.pid);
if (out >= exeLinkPathBuf.data() + exeLinkPathBuf.size() - 1)
return Err(OsError { OsErrorCode::InternalError, "Failed to format /proc path (PID too large?)" });
*out = '\0';
const char* exeLinkPath = exeLinkPathBuf.data();
Array<char, PATH_MAX> exeRealPathBuf;
const isize bytesRead = readlink(exeLinkPath, exeRealPathBuf.data(), exeRealPathBuf.size() - 1);
if (bytesRead == -1)
return Err(MakeOsErrorFromErrno(std::format("Failed to read link '{}'", exeLinkPath)));
exeRealPathBuf.at(bytesRead) = '\0';
StringView compositorNameView;
const StringView pathView(exeRealPathBuf.data(), bytesRead);
StringView filenameView;
if (const usize lastCharPos = pathView.find_last_not_of('/'); lastCharPos != StringView::npos) {
const StringView relevantPart = pathView.substr(0, lastCharPos + 1);
if (const usize separatorPos = relevantPart.find_last_of('/'); separatorPos == StringView::npos)
filenameView = relevantPart;
else
filenameView = relevantPart.substr(separatorPos + 1);
}
if (!filenameView.empty())
compositorNameView = filenameView;
if (compositorNameView.empty() || compositorNameView == "." || compositorNameView == "/")
return Err(OsError { OsErrorCode::NotFound, "Failed to get compositor name from path" });
if (constexpr StringView wrappedSuffix = "-wrapped"; compositorNameView.length() > 1 + wrappedSuffix.length() &&
compositorNameView[0] == '.' && compositorNameView.ends_with(wrappedSuffix)) {
const StringView cleanedView =
compositorNameView.substr(1, compositorNameView.length() - 1 - wrappedSuffix.length());
if (cleanedView.empty())
return Err(OsError { OsErrorCode::NotFound, "Compositor name invalid after heuristic" });
return String(cleanedView);
}
return String(compositorNameView);
}
fn GetMprisPlayers(const SharedPointer<DBus::Connection>& connection) -> Result<String, OsError> {
try {
const SharedPointer<DBus::CallMessage> call =
DBus::CallMessage::create("org.freedesktop.DBus", "/org/freedesktop/DBus", "org.freedesktop.DBus", "ListNames");
const SharedPointer<DBus::Message> reply = connection->send_with_reply_blocking(call, 5);
if (!reply || !reply->is_valid())
return Err(OsError { OsErrorCode::Timeout, "Failed to get reply from ListNames" });
Vec<String> allNamesStd;
DBus::MessageIterator reader(*reply);
reader >> allNamesStd;
for (const String& name : allNamesStd)
if (StringView(name).contains("org.mpris.MediaPlayer2"sv))
return name;
return Err(OsError { OsErrorCode::NotFound, "No MPRIS players found" });
} catch (const DBus::Error& e) { return Err(MakeOsErrorFromDBus(e)); } catch (const Exception& e) {
return Err(OsError { OsErrorCode::InternalError, e.what() });
}
}
fn GetMediaPlayerMetadata(const SharedPointer<DBus::Connection>& connection, const String& playerBusName)
-> Result<MediaInfo, OsError> {
try {
const SharedPointer<DBus::CallMessage> metadataCall =
DBus::CallMessage::create(playerBusName, "/org/mpris/MediaPlayer2", "org.freedesktop.DBus.Properties", "Get");
*metadataCall << "org.mpris.MediaPlayer2.Player" << "Metadata";
const SharedPointer<DBus::Message> metadataReply = connection->send_with_reply_blocking(metadataCall, 1000);
if (!metadataReply || !metadataReply->is_valid()) {
return Err(OsError { OsErrorCode::Timeout, "DBus Get Metadata call timed out or received invalid reply" });
}
DBus::MessageIterator iter(*metadataReply);
DBus::Variant metadataVariant;
iter >> metadataVariant; // Can throw
// MPRIS metadata is variant containing a dict a{sv}
if (metadataVariant.type() != DBus::DataType::DICT_ENTRY && metadataVariant.type() != DBus::DataType::ARRAY) {
return Err(
OsError {
OsErrorCode::ParseError,
std::format(
"Inner metadata variant is not the expected type, expected dict/a{{sv}} but got '{}'",
metadataVariant.signature().str()
),
}
);
}
Map<String, DBus::Variant> metadata = metadataVariant.to_map<String, DBus::Variant>(); // Can throw
Option<String> title = None;
Option<String> artist = None;
Option<String> album = None;
Option<String> appName = None; // Try to get app name too
if (auto titleIter = metadata.find("xesam:title");
titleIter != metadata.end() && titleIter->second.type() == DBus::DataType::STRING)
title = titleIter->second.to_string();
if (auto artistIter = metadata.find("xesam:artist"); artistIter != metadata.end()) {
if (artistIter->second.type() == DBus::DataType::ARRAY) {
if (Vec<String> artists = artistIter->second.to_vector<String>(); !artists.empty())
artist = artists[0];
} else if (artistIter->second.type() == DBus::DataType::STRING) {
artist = artistIter->second.to_string();
}
}
if (auto albumIter = metadata.find("xesam:album");
albumIter != metadata.end() && albumIter->second.type() == DBus::DataType::STRING)
album = albumIter->second.to_string();
try {
const SharedPointer<DBus::CallMessage> identityCall =
DBus::CallMessage::create(playerBusName, "/org/mpris/MediaPlayer2", "org.freedesktop.DBus.Properties", "Get");
*identityCall << "org.mpris.MediaPlayer2" << "Identity";
if (const SharedPointer<DBus::Message> identityReply = connection->send_with_reply_blocking(identityCall, 500);
identityReply && identityReply->is_valid()) {
DBus::MessageIterator identityIter(*identityReply);
DBus::Variant identityVariant;
identityIter >> identityVariant;
if (identityVariant.type() == DBus::DataType::STRING)
appName = identityVariant.to_string();
}
} catch (const DBus::Error& e) {
DEBUG_LOG("Failed to get player Identity property for {}: {}", playerBusName, e.what()); // Non-fatal
}
return MediaInfo(std::move(title), std::move(artist), std::move(album), std::move(appName));
} catch (const DBus::Error& e) { return Err(MakeOsErrorFromDBus(e)); } catch (const Exception& e) {
return Err(
OsError { OsErrorCode::InternalError, std::format("Standard exception processing metadata: {}", e.what()) }
);
}
}
}
fn os::GetOSVersion() -> Result<String, OsError> {
constexpr CStr path = "/etc/os-release";
std::ifstream file(path);
if (!file)
return Err(OsError { OsErrorCode::NotFound, std::format("Failed to open {}", path) });
String line;
constexpr StringView prefix = "PRETTY_NAME=";
while (getline(file, line)) {
if (StringView(line).starts_with(prefix)) {
String value = line.substr(prefix.size());
if ((value.length() >= 2 && value.front() == '"' && value.back() == '"') ||
(value.length() >= 2 && value.front() == '\'' && value.back() == '\''))
value = value.substr(1, value.length() - 2);
if (value.empty())
return Err(
OsError { OsErrorCode::ParseError, std::format("PRETTY_NAME value is empty or only quotes in {}", path) }
);
return value;
}
}
return Err(OsError { OsErrorCode::NotFound, std::format("PRETTY_NAME line not found in {}", path) });
}
fn os::GetMemInfo() -> Result<u64, OsError> {
struct sysinfo info;
if (sysinfo(&info) != 0)
return Err(MakeOsErrorFromErrno("sysinfo call failed"));
const u64 totalRam = info.totalram;
const u64 memUnit = info.mem_unit;
if (memUnit == 0)
return Err(OsError { OsErrorCode::InternalError, "sysinfo returned mem_unit of zero" });
if (totalRam > std::numeric_limits<u64>::max() / memUnit)
return Err(OsError { OsErrorCode::InternalError, "Potential overflow calculating total RAM" });
return info.totalram * info.mem_unit;
}
fn os::GetNowPlaying() -> Result<MediaInfo, NowPlayingError> {
// Dispatcher must outlive the try-block because 'connection' depends on it later.
// ReSharper disable once CppTooWideScope, CppJoinDeclarationAndAssignment
SharedPointer<DBus::Dispatcher> dispatcher;
SharedPointer<DBus::Connection> connection;
try {
dispatcher = DBus::StandaloneDispatcher::create();
if (!dispatcher)
return Err(OsError { OsErrorCode::ApiUnavailable, "Failed to create DBus dispatcher" });
connection = dispatcher->create_connection(DBus::BusType::SESSION);
if (!connection)
return Err(OsError { OsErrorCode::ApiUnavailable, "Failed to connect to DBus session bus" });
} catch (const DBus::Error& e) { return Err(MakeOsErrorFromDBus(e)); } catch (const Exception& e) {
return Err(OsError { OsErrorCode::InternalError, e.what() });
}
Result<String, NowPlayingError> playerBusName = GetMprisPlayers(connection);
if (!playerBusName)
return Err(playerBusName.error());
Result<MediaInfo, OsError> metadataResult = GetMediaPlayerMetadata(connection, *playerBusName);
if (!metadataResult)
return Err(metadataResult.error());
return std::move(*metadataResult);
}
fn os::GetWindowManager() -> Option<String> {
if (Result<String, OsError> waylandResult = GetWaylandCompositor())
return *waylandResult;
else
DEBUG_LOG("Could not detect Wayland compositor: {}", waylandResult.error().message);
if (Result<String, OsError> x11Result = GetX11WindowManager())
return *x11Result;
else
DEBUG_LOG("Could not detect X11 window manager: {}", x11Result.error().message);
return None;
}
fn os::GetDesktopEnvironment() -> Option<String> {
return GetEnv("XDG_CURRENT_DESKTOP")
.transform([](const String& xdgDesktop) -> String {
if (const usize colon = xdgDesktop.find(':'); colon != String::npos)
return xdgDesktop.substr(0, colon);
return xdgDesktop;
})
.or_else([](const EnvError&) -> Result<String, EnvError> { return GetEnv("DESKTOP_SESSION"); })
.transform([](const String& finalValue) -> Option<String> {
DEBUG_LOG("Found desktop environment: {}", finalValue);
return finalValue;
})
.value_or(None);
}
fn os::GetShell() -> Option<String> {
if (const Result<String, EnvError> shellPath = GetEnv("SHELL")) {
// clang-format off
constexpr Array<Pair<StringView, StringView>, 5> shellMap {{
{ "bash", "Bash" },
{ "zsh", "Zsh" },
{ "fish", "Fish" },
{ "nu", "Nushell" },
{ "sh", "SH" }, // sh last because other shells contain "sh"
}};
// clang-format on
for (const auto& [exe, name] : shellMap)
if (shellPath->contains(exe))
return String(name);
return *shellPath; // fallback to the raw shell path
}
return None;
}
fn os::GetHost() -> Result<String, OsError> {
constexpr CStr primaryPath = "/sys/class/dmi/id/product_family";
constexpr CStr fallbackPath = "/sys/class/dmi/id/product_name";
fn readFirstLine = [&](const String& path) -> Result<String, OsError> {
std::ifstream file(path);
String line;
if (!file)
return Err(
OsError { OsErrorCode::NotFound, std::format("Failed to open DMI product identifier file '{}'", path) }
);
if (!getline(file, line))
return Err(OsError { OsErrorCode::ParseError, std::format("DMI product identifier file ('{}') is empty", path) });
return line;
};
return readFirstLine(primaryPath).or_else([&](const OsError& primaryError) -> Result<String, OsError> {
return readFirstLine(fallbackPath).or_else([&](const OsError& fallbackError) -> Result<String, OsError> {
return Err(
OsError {
OsErrorCode::InternalError,
std::format(
"Failed to get host identifier. Primary ('{}'): {}. Fallback ('{}'): {}",
primaryPath,
primaryError.message,
fallbackPath,
fallbackError.message
),
}
);
});
});
}
fn os::GetKernelVersion() -> Result<String, OsError> {
utsname uts;
if (uname(&uts) == -1)
return Err(MakeOsErrorFromErrno("uname call failed"));
if (strlen(uts.release) == 0)
return Err(OsError { OsErrorCode::ParseError, "uname returned null kernel release" });
return uts.release;
}
fn os::GetDiskUsage() -> Result<DiskSpace, OsError> {
struct statvfs stat;
if (statvfs("/", &stat) == -1)
return Err(MakeOsErrorFromErrno(std::format("Failed to get filesystem stats for '/' (statvfs call failed)")));
return DiskSpace {
.used_bytes = (stat.f_blocks * stat.f_frsize) - (stat.f_bfree * stat.f_frsize),
.total_bytes = stat.f_blocks * stat.f_frsize,
};
}
#endif
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