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Files
DankMaterialShell/core/internal/server/loginctl/manager.go
2026-02-27 10:00:41 -05:00

724 lines
17 KiB
Go

package loginctl
import (
"context"
"fmt"
"os"
"sync"
"time"
"github.com/AvengeMedia/DankMaterialShell/core/pkg/dbusutil"
"github.com/godbus/dbus/v5"
)
func NewManager() (*Manager, error) {
conn, err := dbus.ConnectSystemBus()
if err != nil {
return nil, fmt.Errorf("failed to connect to system bus: %w", err)
}
m := &Manager{
state: &SessionState{},
stateMutex: sync.RWMutex{},
stopChan: make(chan struct{}),
conn: conn,
dirty: make(chan struct{}, 1),
signals: make(chan *dbus.Signal, 256),
}
m.sleepInhibitorEnabled.Store(true)
if err := m.initialize(); err != nil {
conn.Close()
return nil, err
}
if err := m.acquireSleepInhibitor(); err != nil {
fmt.Fprintf(os.Stderr, "sleep inhibitor unavailable: %v\n", err)
}
m.notifierWg.Add(1)
go m.notifier()
if err := m.startSignalPump(); err != nil {
m.Close()
return nil, err
}
return m, nil
}
func (m *Manager) initialize() error {
m.managerObj = m.conn.Object(dbusDest, dbus.ObjectPath(dbusPath))
m.initializeFallbackDelay()
sessionID, sessionPath, err := m.discoverSession()
if err != nil {
return fmt.Errorf("failed to get session path: %w", err)
}
m.stateMutex.Lock()
m.state.SessionID = sessionID
m.state.SessionPath = string(sessionPath)
m.sessionPath = sessionPath
m.stateMutex.Unlock()
m.sessionObj = m.conn.Object(dbusDest, sessionPath)
if err := m.updateSessionState(); err != nil {
return err
}
return nil
}
func (m *Manager) discoverSession() (string, dbus.ObjectPath, error) {
// 1. Explicit XDG_SESSION_ID
if id := os.Getenv("XDG_SESSION_ID"); id != "" {
if path, err := m.getSession(id); err == nil {
fmt.Fprintf(os.Stderr, "loginctl: using XDG_SESSION_ID=%s\n", id)
return id, path, nil
}
}
// 2. PID-based lookup (works when caller is inside a session cgroup)
if id, path, err := m.getSessionByPID(uint32(os.Getpid())); err == nil {
fmt.Fprintf(os.Stderr, "loginctl: found session %s via PID\n", id)
return id, path, nil
}
// 3. User's primary display session (handles UWSM and similar)
if id, path, err := m.getUserDisplaySession(); err == nil {
fmt.Fprintf(os.Stderr, "loginctl: found session %s via User.Display\n", id)
return id, path, nil
}
// 4. Score all sessions for current UID
if id, path, err := m.findBestSession(); err == nil {
fmt.Fprintf(os.Stderr, "loginctl: found session %s via ListSessions scoring\n", id)
return id, path, nil
}
// 5. Last resort: "self"
path, err := m.getSession("self")
if err != nil {
return "", "", fmt.Errorf("%w", err)
}
return "self", path, nil
}
func (m *Manager) getSession(id string) (dbus.ObjectPath, error) {
var out dbus.ObjectPath
err := m.managerObj.Call(dbusManagerInterface+".GetSession", 0, id).Store(&out)
if err != nil {
return "", err
}
return out, nil
}
func (m *Manager) getSessionByPID(pid uint32) (string, dbus.ObjectPath, error) {
var path dbus.ObjectPath
if err := m.managerObj.Call(dbusManagerInterface+".GetSessionByPID", 0, pid).Store(&path); err != nil {
return "", "", err
}
sessionObj := m.conn.Object(dbusDest, path)
var id dbus.Variant
if err := sessionObj.Call(dbusPropsInterface+".Get", 0, dbusSessionInterface, "Id").Store(&id); err != nil {
return "", "", err
}
return id.Value().(string), path, nil
}
func (m *Manager) getUserDisplaySession() (string, dbus.ObjectPath, error) {
uid := uint32(os.Getuid())
var userPath dbus.ObjectPath
if err := m.managerObj.Call(dbusManagerInterface+".GetUser", 0, uid).Store(&userPath); err != nil {
return "", "", err
}
userObj := m.conn.Object(dbusDest, userPath)
var display dbus.Variant
if err := userObj.Call(dbusPropsInterface+".Get", 0, dbusUserInterface, "Display").Store(&display); err != nil {
return "", "", err
}
pair, ok := display.Value().([]any)
if !ok || len(pair) < 2 {
return "", "", fmt.Errorf("unexpected Display format")
}
sessionID, _ := pair[0].(string)
sessionPath, _ := pair[1].(dbus.ObjectPath)
if sessionID == "" || sessionPath == "" {
return "", "", fmt.Errorf("empty Display session")
}
return sessionID, sessionPath, nil
}
type sessionCandidate struct {
id string
path dbus.ObjectPath
}
func (m *Manager) findBestSession() (string, dbus.ObjectPath, error) {
// ListSessions returns a(susso): [][]any where each entry is [id, uid, name, seat, path]
var raw [][]any
if err := m.managerObj.Call(dbusManagerInterface+".ListSessions", 0).Store(&raw); err != nil {
return "", "", err
}
uid := uint32(os.Getuid())
var candidates []sessionCandidate
for _, entry := range raw {
if len(entry) < 5 {
continue
}
entryUID, _ := entry[1].(uint32)
if entryUID != uid {
continue
}
id, _ := entry[0].(string)
path, _ := entry[4].(dbus.ObjectPath)
if id != "" && path != "" {
candidates = append(candidates, sessionCandidate{id: id, path: path})
}
}
if len(candidates) == 0 {
return "", "", fmt.Errorf("no sessions for uid %d", uid)
}
bestScore := -1
var best sessionCandidate
for _, c := range candidates {
score := m.scoreSession(c.path)
if score > bestScore {
bestScore = score
best = c
}
}
if bestScore < 0 {
return "", "", fmt.Errorf("no viable session found")
}
return best.id, best.path, nil
}
func (m *Manager) scoreSession(path dbus.ObjectPath) int {
obj := m.conn.Object(dbusDest, path)
var props map[string]dbus.Variant
if err := obj.Call(dbusPropsInterface+".GetAll", 0, dbusSessionInterface).Store(&props); err != nil {
return -1
}
getStr := func(key string) string {
if v, ok := props[key]; ok {
if s, ok := v.Value().(string); ok {
return s
}
}
return ""
}
getBool := func(key string) bool {
if v, ok := props[key]; ok {
if b, ok := v.Value().(bool); ok {
return b
}
}
return false
}
getUint32 := func(key string) uint32 {
if v, ok := props[key]; ok {
if u, ok := v.Value().(uint32); ok {
return u
}
}
return 0
}
class := getStr("Class")
if class != "user" {
return -1
}
if getBool("Remote") {
return -1
}
score := 0
if getBool("Active") {
score += 100
}
switch getStr("Type") {
case "wayland", "x11":
score += 80
case "tty":
score += 10
}
if v, ok := props["Seat"]; ok {
if seatArr, ok := v.Value().([]any); ok && len(seatArr) >= 1 {
if seat, ok := seatArr[0].(string); ok && seat != "" {
score += 40
if seat == "seat0" {
score += 10
}
}
}
}
if getUint32("VTNr") > 0 {
score += 20
}
return score
}
func (m *Manager) refreshSessionBinding() error {
if m.managerObj == nil || m.conn == nil {
return fmt.Errorf("manager not fully initialized")
}
sessionPath, err := m.getSession(m.state.SessionID)
if err != nil {
return fmt.Errorf("failed to get session path: %w", err)
}
m.stateMutex.RLock()
currentPath := m.sessionPath
m.stateMutex.RUnlock()
if sessionPath == currentPath {
return nil
}
m.stopSignalPump()
m.stateMutex.Lock()
m.state.SessionPath = string(sessionPath)
m.sessionPath = sessionPath
m.stateMutex.Unlock()
m.sessionObj = m.conn.Object(dbusDest, sessionPath)
if err := m.updateSessionState(); err != nil {
return err
}
m.signals = make(chan *dbus.Signal, 256)
return m.startSignalPump()
}
func (m *Manager) updateSessionState() error {
ctx := context.Background()
props, err := m.getSessionProperties(ctx)
if err != nil {
return err
}
m.stateMutex.Lock()
defer m.stateMutex.Unlock()
m.state.Active = dbusutil.GetOr(props, "Active", m.state.Active)
m.state.IdleHint = dbusutil.GetOr(props, "IdleHint", m.state.IdleHint)
m.state.IdleSinceHint = dbusutil.GetOr(props, "IdleSinceHint", m.state.IdleSinceHint)
if lockedHint, ok := dbusutil.Get[bool](props, "LockedHint"); ok {
m.state.LockedHint = lockedHint
m.state.Locked = lockedHint
}
m.state.SessionType = dbusutil.GetOr(props, "Type", m.state.SessionType)
m.state.SessionClass = dbusutil.GetOr(props, "Class", m.state.SessionClass)
if v, ok := props["User"]; ok {
if userArr, ok := v.Value().([]any); ok && len(userArr) >= 1 {
if uid, ok := userArr[0].(uint32); ok {
m.state.User = uid
}
}
}
m.state.UserName = dbusutil.GetOr(props, "Name", m.state.UserName)
m.state.RemoteHost = dbusutil.GetOr(props, "RemoteHost", m.state.RemoteHost)
m.state.Service = dbusutil.GetOr(props, "Service", m.state.Service)
m.state.TTY = dbusutil.GetOr(props, "TTY", m.state.TTY)
m.state.Display = dbusutil.GetOr(props, "Display", m.state.Display)
m.state.Remote = dbusutil.GetOr(props, "Remote", m.state.Remote)
if v, ok := props["Seat"]; ok {
if seatArr, ok := v.Value().([]any); ok && len(seatArr) >= 1 {
if seatID, ok := seatArr[0].(string); ok {
m.state.Seat = seatID
}
}
}
m.state.VTNr = dbusutil.GetOr(props, "VTNr", m.state.VTNr)
return nil
}
func (m *Manager) getSessionProperties(ctx context.Context) (map[string]dbus.Variant, error) {
var props map[string]dbus.Variant
err := m.sessionObj.CallWithContext(ctx, dbusPropsInterface+".GetAll", 0, dbusSessionInterface).Store(&props)
if err != nil {
return nil, err
}
return props, nil
}
func (m *Manager) acquireSleepInhibitor() error {
if !m.sleepInhibitorEnabled.Load() {
return nil
}
m.inhibitMu.Lock()
defer m.inhibitMu.Unlock()
if m.inhibitFile != nil {
return nil
}
if m.managerObj == nil {
return fmt.Errorf("manager object not available")
}
file, err := m.inhibit("sleep", "DankMaterialShell", "Lock before suspend", "delay")
if err != nil {
return err
}
m.inhibitFile = file
return nil
}
func (m *Manager) inhibit(what, who, why, mode string) (*os.File, error) {
var fd dbus.UnixFD
err := m.managerObj.Call(dbusManagerInterface+".Inhibit", 0, what, who, why, mode).Store(&fd)
if err != nil {
return nil, err
}
return os.NewFile(uintptr(fd), "inhibit"), nil
}
func (m *Manager) releaseSleepInhibitor() {
m.inhibitMu.Lock()
f := m.inhibitFile
m.inhibitFile = nil
m.inhibitMu.Unlock()
if f != nil {
f.Close()
}
}
func (m *Manager) releaseForCycle(id uint64) {
if !m.inSleepCycle.Load() || m.sleepCycleID.Load() != id {
return
}
m.releaseSleepInhibitor()
}
func (m *Manager) initializeFallbackDelay() {
var maxDelayUSec uint64
err := m.managerObj.Call(
dbusPropsInterface+".Get",
0,
dbusManagerInterface,
"InhibitDelayMaxUSec",
).Store(&maxDelayUSec)
if err != nil {
m.fallbackDelay = 2 * time.Second
return
}
maxDelay := time.Duration(maxDelayUSec) * time.Microsecond
computed := (maxDelay * 8) / 10
if computed < 2*time.Second {
m.fallbackDelay = 2 * time.Second
} else if computed > 4*time.Second {
m.fallbackDelay = 4 * time.Second
} else {
m.fallbackDelay = computed
}
}
func (m *Manager) newLockerReadyCh() chan struct{} {
m.lockerReadyChMu.Lock()
defer m.lockerReadyChMu.Unlock()
m.lockerReadyCh = make(chan struct{})
return m.lockerReadyCh
}
func (m *Manager) signalLockerReady() {
m.lockerReadyChMu.Lock()
ch := m.lockerReadyCh
if ch != nil {
close(ch)
m.lockerReadyCh = nil
}
m.lockerReadyChMu.Unlock()
}
func (m *Manager) snapshotState() SessionState {
m.stateMutex.RLock()
defer m.stateMutex.RUnlock()
return *m.state
}
func stateChangedMeaningfully(old, new *SessionState) bool {
if old.Locked != new.Locked {
return true
}
if old.LockedHint != new.LockedHint {
return true
}
if old.Active != new.Active {
return true
}
if old.IdleHint != new.IdleHint {
return true
}
if old.PreparingForSleep != new.PreparingForSleep {
return true
}
return false
}
func (m *Manager) GetState() SessionState {
return m.snapshotState()
}
func (m *Manager) Subscribe(id string) chan SessionState {
ch := make(chan SessionState, 64)
m.subscribers.Store(id, ch)
return ch
}
func (m *Manager) Unsubscribe(id string) {
if val, ok := m.subscribers.LoadAndDelete(id); ok {
close(val)
}
}
func (m *Manager) notifier() {
defer m.notifierWg.Done()
const minGap = 100 * time.Millisecond
timer := time.NewTimer(minGap)
timer.Stop()
var pending bool
for {
select {
case <-m.stopChan:
timer.Stop()
return
case <-m.dirty:
if pending {
continue
}
pending = true
timer.Reset(minGap)
case <-timer.C:
if !pending {
continue
}
currentState := m.snapshotState()
if m.lastNotifiedState != nil && !stateChangedMeaningfully(m.lastNotifiedState, &currentState) {
pending = false
continue
}
m.subscribers.Range(func(key string, ch chan SessionState) bool {
select {
case ch <- currentState:
default:
}
return true
})
stateCopy := currentState
m.lastNotifiedState = &stateCopy
pending = false
}
}
}
func (m *Manager) notifySubscribers() {
select {
case m.dirty <- struct{}{}:
default:
}
}
func (m *Manager) startSignalPump() error {
m.conn.Signal(m.signals)
if err := m.conn.AddMatchSignal(
dbus.WithMatchObjectPath(m.sessionPath),
dbus.WithMatchInterface(dbusPropsInterface),
dbus.WithMatchMember("PropertiesChanged"),
); err != nil {
m.conn.RemoveSignal(m.signals)
return err
}
if err := m.conn.AddMatchSignal(
dbus.WithMatchObjectPath(m.sessionPath),
dbus.WithMatchInterface(dbusSessionInterface),
dbus.WithMatchMember("Lock"),
); err != nil {
m.conn.RemoveMatchSignal(
dbus.WithMatchObjectPath(m.sessionPath),
dbus.WithMatchInterface(dbusPropsInterface),
dbus.WithMatchMember("PropertiesChanged"),
)
m.conn.RemoveSignal(m.signals)
return err
}
if err := m.conn.AddMatchSignal(
dbus.WithMatchObjectPath(m.sessionPath),
dbus.WithMatchInterface(dbusSessionInterface),
dbus.WithMatchMember("Unlock"),
); err != nil {
m.conn.RemoveMatchSignal(
dbus.WithMatchObjectPath(m.sessionPath),
dbus.WithMatchInterface(dbusPropsInterface),
dbus.WithMatchMember("PropertiesChanged"),
)
m.conn.RemoveMatchSignal(
dbus.WithMatchObjectPath(m.sessionPath),
dbus.WithMatchInterface(dbusSessionInterface),
dbus.WithMatchMember("Lock"),
)
m.conn.RemoveSignal(m.signals)
return err
}
if err := m.conn.AddMatchSignal(
dbus.WithMatchObjectPath(dbus.ObjectPath(dbusPath)),
dbus.WithMatchInterface(dbusManagerInterface),
dbus.WithMatchMember("PrepareForSleep"),
); err != nil {
m.conn.RemoveMatchSignal(
dbus.WithMatchObjectPath(m.sessionPath),
dbus.WithMatchInterface(dbusPropsInterface),
dbus.WithMatchMember("PropertiesChanged"),
)
m.conn.RemoveMatchSignal(
dbus.WithMatchObjectPath(m.sessionPath),
dbus.WithMatchInterface(dbusSessionInterface),
dbus.WithMatchMember("Lock"),
)
m.conn.RemoveMatchSignal(
dbus.WithMatchObjectPath(m.sessionPath),
dbus.WithMatchInterface(dbusSessionInterface),
dbus.WithMatchMember("Unlock"),
)
m.conn.RemoveSignal(m.signals)
return err
}
if err := m.conn.AddMatchSignal(
dbus.WithMatchObjectPath("/org/freedesktop/DBus"),
dbus.WithMatchInterface("org.freedesktop.DBus"),
dbus.WithMatchMember("NameOwnerChanged"),
); err != nil {
m.conn.RemoveMatchSignal(
dbus.WithMatchObjectPath(m.sessionPath),
dbus.WithMatchInterface(dbusPropsInterface),
dbus.WithMatchMember("PropertiesChanged"),
)
m.conn.RemoveMatchSignal(
dbus.WithMatchObjectPath(m.sessionPath),
dbus.WithMatchInterface(dbusSessionInterface),
dbus.WithMatchMember("Lock"),
)
m.conn.RemoveMatchSignal(
dbus.WithMatchObjectPath(m.sessionPath),
dbus.WithMatchInterface(dbusSessionInterface),
dbus.WithMatchMember("Unlock"),
)
m.conn.RemoveMatchSignal(
dbus.WithMatchObjectPath(dbus.ObjectPath(dbusPath)),
dbus.WithMatchInterface(dbusManagerInterface),
dbus.WithMatchMember("PrepareForSleep"),
)
m.conn.RemoveSignal(m.signals)
return err
}
m.sigWG.Add(1)
go func() {
defer m.sigWG.Done()
for {
select {
case <-m.stopChan:
return
case sig, ok := <-m.signals:
if !ok {
return
}
if sig == nil {
continue
}
m.handleDBusSignal(sig)
}
}
}()
return nil
}
func (m *Manager) stopSignalPump() {
if m.conn == nil {
return
}
m.conn.RemoveMatchSignal(
dbus.WithMatchObjectPath(m.sessionPath),
dbus.WithMatchInterface(dbusPropsInterface),
dbus.WithMatchMember("PropertiesChanged"),
)
m.conn.RemoveMatchSignal(
dbus.WithMatchObjectPath(m.sessionPath),
dbus.WithMatchInterface(dbusSessionInterface),
dbus.WithMatchMember("Lock"),
)
m.conn.RemoveMatchSignal(
dbus.WithMatchObjectPath(m.sessionPath),
dbus.WithMatchInterface(dbusSessionInterface),
dbus.WithMatchMember("Unlock"),
)
m.conn.RemoveMatchSignal(
dbus.WithMatchObjectPath(dbus.ObjectPath(dbusPath)),
dbus.WithMatchInterface(dbusManagerInterface),
dbus.WithMatchMember("PrepareForSleep"),
)
m.conn.RemoveMatchSignal(
dbus.WithMatchObjectPath("/org/freedesktop/DBus"),
dbus.WithMatchInterface("org.freedesktop.DBus"),
dbus.WithMatchMember("NameOwnerChanged"),
)
m.conn.RemoveSignal(m.signals)
close(m.signals)
m.sigWG.Wait()
}
func (m *Manager) Close() {
close(m.stopChan)
m.notifierWg.Wait()
m.stopSignalPump()
m.releaseSleepInhibitor()
m.subscribers.Range(func(key string, ch chan SessionState) bool {
close(ch)
m.subscribers.Delete(key)
return true
})
if m.conn != nil {
m.conn.Close()
}
}