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