From f96fcee1fd3af11874b5dacc18e24cacebad3ed4 Mon Sep 17 00:00:00 2001
From: Poly <marynczak.bartlomiej@gmail.com>
Date: Wed, 10 Feb 2021 03:37:17 +0100
Subject: [PATCH] [Debug Trait] backend

backend/libinput
backend/egl
backend/drm
backend/session
---
 src/backend/drm/atomic/mod.rs        | 30 +++++++++++++++++++++++++++
 src/backend/drm/atomic/session.rs    |  1 +
 src/backend/drm/atomic/surface.rs    | 16 ++++++++++++++
 src/backend/drm/common/fallback.rs   | 31 ++++++++++++++++++++++++++++
 src/backend/drm/egl/mod.rs           | 23 +++++++++++++++++++++
 src/backend/drm/egl/session.rs       |  1 +
 src/backend/drm/egl/surface.rs       |  2 ++
 src/backend/drm/eglstream/egl.rs     |  1 +
 src/backend/drm/eglstream/mod.rs     | 11 ++++++++++
 src/backend/drm/eglstream/session.rs |  1 +
 src/backend/drm/eglstream/surface.rs |  3 +++
 src/backend/egl/context.rs           |  1 +
 src/backend/egl/display.rs           | 13 ++++++++++++
 src/backend/egl/mod.rs               | 14 +++++++++++++
 src/backend/egl/native.rs            |  3 +++
 src/backend/egl/surface.rs           |  1 +
 src/backend/graphics/gl.rs           | 10 +++++++++
 src/backend/graphics/glium.rs        | 11 ++++++++++
 src/backend/libinput/mod.rs          | 17 +++++++++++++++
 src/backend/session/auto.rs          |  3 ++-
 src/backend/session/dbus/logind.rs   | 19 +++++++++++++++--
 src/backend/session/direct.rs        | 21 +++++++++++++++++++
 22 files changed, 230 insertions(+), 3 deletions(-)

diff --git a/src/backend/drm/atomic/mod.rs b/src/backend/drm/atomic/mod.rs
index 507abd3..856c017 100644
--- a/src/backend/drm/atomic/mod.rs
+++ b/src/backend/drm/atomic/mod.rs
@@ -20,6 +20,7 @@
 
 use std::cell::RefCell;
 use std::collections::HashMap;
+use std::fmt;
 use std::os::unix::io::{AsRawFd, RawFd};
 use std::rc::Rc;
 use std::sync::{
@@ -59,6 +60,23 @@ pub struct AtomicDrmDevice<A: AsRawFd + 'static> {
     logger: ::slog::Logger,
 }
 
+impl<A: AsRawFd + 'static> fmt::Debug for AtomicDrmDevice<A> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let mut debug = f.debug_struct("AtomicDrmDevice");
+
+        debug
+            .field("dev", &self.dev)
+            .field("dev_id", &self.dev_id)
+            .field("active", &self.active)
+            .field("backends", &self.backends);
+
+        #[cfg(feature = "backend_session")]
+        debug.field("links", &self.links);
+
+        debug.field("logger", &self.logger).finish()
+    }
+}
+
 type OldState = (
     Vec<(connector::Handle, PropertyValueSet)>,
     Vec<(crtc::Handle, PropertyValueSet)>,
@@ -82,6 +100,18 @@ pub(in crate::backend::drm) struct Dev<A: AsRawFd + 'static> {
     logger: ::slog::Logger,
 }
 
+impl<A: AsRawFd + 'static> fmt::Debug for Dev<A> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("Dev")
+            .field("privileged", &self.privileged)
+            .field("active", &self.active)
+            .field("old_state", &self.old_state)
+            .field("prop_mapping", &self.prop_mapping)
+            .field("logger", &self.logger)
+            .finish()
+    }
+}
+
 impl<A: AsRawFd + 'static> AsRawFd for Dev<A> {
     fn as_raw_fd(&self) -> RawFd {
         self.fd.as_raw_fd()
diff --git a/src/backend/drm/atomic/session.rs b/src/backend/drm/atomic/session.rs
index 5b7cfbc..d58e9ba 100644
--- a/src/backend/drm/atomic/session.rs
+++ b/src/backend/drm/atomic/session.rs
@@ -25,6 +25,7 @@ use crate::{
 /// [`SessionObserver`](SessionObserver)
 /// linked to the [`AtomicDrmDevice`](AtomicDrmDevice)
 /// it was created from.
+#[derive(Debug)]
 pub struct AtomicDrmDeviceObserver<A: AsRawFd + 'static> {
     dev: WeakArc<Dev<A>>,
     dev_id: dev_t,
diff --git a/src/backend/drm/atomic/surface.rs b/src/backend/drm/atomic/surface.rs
index 96c08ef..475aec6 100644
--- a/src/backend/drm/atomic/surface.rs
+++ b/src/backend/drm/atomic/surface.rs
@@ -7,6 +7,7 @@ use drm::control::{
 use drm::Device as BasicDevice;
 
 use std::collections::HashSet;
+use std::fmt;
 use std::os::unix::io::{AsRawFd, RawFd};
 use std::sync::{atomic::Ordering, Arc, Mutex, RwLock};
 
@@ -47,6 +48,20 @@ pub(in crate::backend::drm) struct AtomicDrmSurfaceInternal<A: AsRawFd + 'static
     pub(super) test_buffer: Mutex<Option<(DumbBuffer, framebuffer::Handle)>>,
 }
 
+impl<A: AsRawFd + 'static> fmt::Debug for AtomicDrmSurfaceInternal<A> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("AtomicDrmSurfaceInternal")
+            .field("crtc", &self.crtc)
+            .field("cursor", &self.cursor)
+            .field("planse", &self.planes)
+            .field("state", &self.state)
+            .field("pending", &self.pending)
+            .field("logger", &self.logger)
+            .field("test_buffer", &self.test_buffer)
+            .finish()
+    }
+}
+
 impl<A: AsRawFd + 'static> AsRawFd for AtomicDrmSurfaceInternal<A> {
     fn as_raw_fd(&self) -> RawFd {
         self.dev.as_raw_fd()
@@ -1003,6 +1018,7 @@ impl<A: AsRawFd + 'static> AtomicDrmSurfaceInternal<A> {
 }
 
 /// Open raw crtc utilizing atomic mode-setting
+#[derive(Debug)]
 pub struct AtomicDrmSurface<A: AsRawFd + 'static>(
     pub(in crate::backend::drm) Arc<AtomicDrmSurfaceInternal<A>>,
 );
diff --git a/src/backend/drm/common/fallback.rs b/src/backend/drm/common/fallback.rs
index c9d9f39..d86aed8 100644
--- a/src/backend/drm/common/fallback.rs
+++ b/src/backend/drm/common/fallback.rs
@@ -36,6 +36,7 @@ use drm::{
 use nix::libc::c_void;
 use nix::libc::dev_t;
 use std::env;
+use std::fmt;
 use std::os::unix::io::{AsRawFd, RawFd};
 #[cfg(feature = "use_system_lib")]
 use wayland_server::Display;
@@ -49,6 +50,21 @@ pub enum FallbackDevice<D1: Device + 'static, D2: Device + 'static> {
     Fallback(D2),
 }
 
+impl<D1: Device + 'static, D2: Device + 'static> fmt::Debug for FallbackDevice<D1, D2> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            FallbackDevice::Preference(d) => f
+                .debug_struct("FallbackDevice::Preference")
+                .field("device_id", &d.device_id())
+                .finish(),
+            FallbackDevice::Fallback(d) => f
+                .debug_struct("FallbackDevice::Preference")
+                .field("device_id", &d.device_id())
+                .finish(),
+        }
+    }
+}
+
 struct FallbackDeviceHandlerD1<E1, E2, C, S1, S2, D1, D2>(
     Box<dyn DeviceHandler<Device = FallbackDevice<D1, D2>> + 'static>,
 )
@@ -136,6 +152,21 @@ pub enum FallbackSurface<S1: Surface, S2: Surface> {
     Fallback(S2),
 }
 
+impl<S1: Surface, S2: Surface> fmt::Debug for FallbackSurface<S1, S2> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            FallbackSurface::Preference(s) => f
+                .debug_struct("FallbackDevice::Preference")
+                .field("crtc", &s.crtc())
+                .finish(),
+            FallbackSurface::Fallback(s) => f
+                .debug_struct("FallbackDevice::Preference")
+                .field("crtc", &s.crtc())
+                .finish(),
+        }
+    }
+}
+
 /// Enum uniting two kinds of possible errors.
 #[derive(Debug, thiserror::Error)]
 pub enum EitherError<E1: std::error::Error + 'static, E2: std::error::Error + 'static> {
diff --git a/src/backend/drm/egl/mod.rs b/src/backend/drm/egl/mod.rs
index dac507f..c45f04c 100644
--- a/src/backend/drm/egl/mod.rs
+++ b/src/backend/drm/egl/mod.rs
@@ -15,6 +15,7 @@ use drm::SystemError as DrmError;
 use nix::libc::dev_t;
 use std::cell::RefCell;
 use std::collections::HashMap;
+use std::fmt;
 use std::os::unix::io::{AsRawFd, RawFd};
 use std::rc::Rc;
 use std::sync::{Arc, Weak as WeakArc};
@@ -69,6 +70,28 @@ where
     links: Vec<crate::signaling::SignalToken>,
 }
 
+impl<B, D> fmt::Debug for EglDevice<B, D>
+where
+    B: Backend<Surface = <D as Device>::Surface, Error = <<D as Device>::Surface as Surface>::Error>
+        + 'static,
+    D: Device + NativeDisplay<B, Arguments = Arguments> + 'static,
+    <D as Device>::Surface: NativeSurface<Error = <<D as Device>::Surface as Surface>::Error>,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let mut debug = f.debug_struct("EglDevice");
+
+        debug
+            .field("logger", &self.logger)
+            .field("default_attributes", &self.default_attributes)
+            .field("default_requirements", &self.default_requirements);
+
+        #[cfg(feature = "backend_session")]
+        debug.field("links", &self.links);
+
+        debug.finish()
+    }
+}
+
 impl<B, D> AsRawFd for EglDevice<B, D>
 where
     B: Backend<Surface = <D as Device>::Surface, Error = <<D as Device>::Surface as Surface>::Error>
diff --git a/src/backend/drm/egl/session.rs b/src/backend/drm/egl/session.rs
index f8ab7ab..2465beb 100644
--- a/src/backend/drm/egl/session.rs
+++ b/src/backend/drm/egl/session.rs
@@ -23,6 +23,7 @@ use crate::{
 /// [`SessionObserver`](SessionObserver)
 /// linked to the [`EglDevice`](EglDevice) it was
 /// created from.
+#[derive(Debug)]
 pub struct EglDeviceObserver<N: NativeSurface + Surface> {
     backends: Weak<RefCell<HashMap<crtc::Handle, WeakArc<EglSurfaceInternal<N>>>>>,
 }
diff --git a/src/backend/drm/egl/surface.rs b/src/backend/drm/egl/surface.rs
index 2b852fb..4967300 100644
--- a/src/backend/drm/egl/surface.rs
+++ b/src/backend/drm/egl/surface.rs
@@ -14,8 +14,10 @@ use crate::backend::graphics::PixelFormat;
 use crate::backend::graphics::{CursorBackend, SwapBuffersError};
 
 /// Egl surface for rendering
+#[derive(Debug)]
 pub struct EglSurface<N: native::NativeSurface + Surface>(pub(super) Arc<EglSurfaceInternal<N>>);
 
+#[derive(Debug)]
 pub(super) struct EglSurfaceInternal<N>
 where
     N: native::NativeSurface + Surface,
diff --git a/src/backend/drm/eglstream/egl.rs b/src/backend/drm/eglstream/egl.rs
index 861e5e1..5e836a0 100644
--- a/src/backend/drm/eglstream/egl.rs
+++ b/src/backend/drm/eglstream/egl.rs
@@ -31,6 +31,7 @@ use std::sync::Arc;
 /// Egl Device backend type
 ///
 /// See [`Backend`](::backend::egl::native::Backend).
+#[derive(Debug)]
 pub struct EglStreamDeviceBackend<D: RawDevice + 'static> {
     _userdata: PhantomData<D>,
 }
diff --git a/src/backend/drm/eglstream/mod.rs b/src/backend/drm/eglstream/mod.rs
index 69f759b..aef74a3 100644
--- a/src/backend/drm/eglstream/mod.rs
+++ b/src/backend/drm/eglstream/mod.rs
@@ -28,6 +28,7 @@ use nix::libc::dev_t;
 use std::cell::RefCell;
 use std::collections::HashMap;
 use std::ffi::CStr;
+use std::fmt;
 use std::os::unix::fs::MetadataExt;
 use std::os::unix::io::{AsRawFd, RawFd};
 use std::rc::{Rc, Weak};
@@ -90,6 +91,16 @@ pub struct EglStreamDevice<D: RawDevice + ControlDevice + 'static> {
     links: Vec<crate::signaling::SignalToken>,
 }
 
+impl<D: RawDevice + ControlDevice + 'static> fmt::Debug for EglStreamDevice<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let mut debug = f.debug_struct("EglStreamDevice");
+        debug.field("dev", &self.dev).field("logger", &self.logger);
+        #[cfg(feature = "backend_session")]
+        debug.field("links", &self.links);
+        debug.finish()
+    }
+}
+
 impl<D: RawDevice + ControlDevice + 'static> EglStreamDevice<D> {
     /// Try to create a new [`EglStreamDevice`] from an open device.
     ///
diff --git a/src/backend/drm/eglstream/session.rs b/src/backend/drm/eglstream/session.rs
index a85cc5c..ca845cc 100644
--- a/src/backend/drm/eglstream/session.rs
+++ b/src/backend/drm/eglstream/session.rs
@@ -19,6 +19,7 @@ use drm::control::{crtc, Device as ControlDevice};
 /// [`SessionObserver`](SessionObserver)
 /// linked to the [`EglStreamDevice`](EglStreamDevice) it was
 /// created from.
+#[derive(Debug)]
 pub struct EglStreamDeviceObserver<S: RawSurface + 'static> {
     backends: Weak<RefCell<HashMap<crtc::Handle, WeakArc<EglStreamSurfaceInternal<S>>>>>,
     logger: ::slog::Logger,
diff --git a/src/backend/drm/eglstream/surface.rs b/src/backend/drm/eglstream/surface.rs
index 0d26d88..a7d86ea 100644
--- a/src/backend/drm/eglstream/surface.rs
+++ b/src/backend/drm/eglstream/surface.rs
@@ -30,10 +30,12 @@ use crate::backend::graphics::CursorBackend;
 
 // We do not want to mark the whole surface as `Send` in case we screw up somewhere else
 // and because S needs to be `Send` as well for this to work.
+#[derive(Debug)]
 pub(super) struct StreamHandle(pub(super) EGLStreamKHR);
 // EGLStreamKHR can be moved between threads
 unsafe impl Send for StreamHandle {}
 
+#[derive(Debug)]
 pub(in crate::backend::drm) struct EglStreamSurfaceInternal<S: RawSurface + 'static> {
     pub(in crate::backend::drm) crtc: S,
     pub(in crate::backend::drm) cursor: Mutex<Option<(DumbBuffer, (u32, u32))>>,
@@ -205,6 +207,7 @@ impl<S: RawSurface + 'static> CursorBackend for EglStreamSurfaceInternal<S> {
 }
 
 /// egl stream surface for rendering
+#[derive(Debug)]
 pub struct EglStreamSurface<S: RawSurface + 'static>(
     pub(in crate::backend::drm) Arc<EglStreamSurfaceInternal<S>>,
 );
diff --git a/src/backend/egl/context.rs b/src/backend/egl/context.rs
index 9b16651..f62e14a 100644
--- a/src/backend/egl/context.rs
+++ b/src/backend/egl/context.rs
@@ -10,6 +10,7 @@ use std::ptr;
 use std::sync::{atomic::Ordering, Arc};
 
 /// EGL context for rendering
+#[derive(Debug)]
 pub struct EGLContext {
     context: ffi::egl::types::EGLContext,
     display: Arc<EGLDisplayHandle>,
diff --git a/src/backend/egl/display.rs b/src/backend/egl/display.rs
index 0e960cd..6012a3b 100644
--- a/src/backend/egl/display.rs
+++ b/src/backend/egl/display.rs
@@ -24,10 +24,12 @@ use std::ffi::CStr;
 use std::marker::PhantomData;
 use std::mem::MaybeUninit;
 
+use std::fmt;
 use std::ops::Deref;
 
 /// Wrapper around [`ffi::EGLDisplay`](ffi::egl::types::EGLDisplay) to ensure display is only destroyed
 /// once all resources bound to it have been dropped.
+#[derive(Debug)]
 pub struct EGLDisplayHandle {
     /// ffi EGLDisplay ptr
     pub handle: ffi::egl::types::EGLDisplay,
@@ -54,6 +56,7 @@ impl Drop for EGLDisplayHandle {
 }
 
 /// [`EGLDisplay`] represents an initialised EGL environment
+#[derive(Debug)]
 pub struct EGLDisplay<B: native::Backend, N: native::NativeDisplay<B>> {
     native: RefCell<N>,
     pub(crate) display: Arc<EGLDisplayHandle>,
@@ -454,6 +457,16 @@ pub struct EGLBufferReader {
     gl: gl_ffi::Gles2,
 }
 
+#[cfg(feature = "use_system_lib")]
+impl fmt::Debug for EGLBufferReader {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("EGLBufferReader")
+            .field("display", &self.display)
+            .field("wayland", &self.wayland)
+            .finish()
+    }
+}
+
 #[cfg(feature = "use_system_lib")]
 impl EGLBufferReader {
     fn new(display: Arc<EGLDisplayHandle>, wayland: *mut wl_display) -> Self {
diff --git a/src/backend/egl/mod.rs b/src/backend/egl/mod.rs
index 047bd64..f03c311 100644
--- a/src/backend/egl/mod.rs
+++ b/src/backend/egl/mod.rs
@@ -269,6 +269,20 @@ pub struct EGLImages {
     gl: gl_ffi::Gles2,
 }
 
+#[cfg(feature = "wayland_frontend")]
+impl fmt::Debug for EGLImages {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("Point")
+            .field("display", &self.display)
+            .field("width", &self.width)
+            .field("height", &self.height)
+            .field("y_inverted", &self.y_inverted)
+            .field("format", &self.format)
+            .field("images", &self.images)
+            .finish()
+    }
+}
+
 #[cfg(feature = "wayland_frontend")]
 impl EGLImages {
     /// Amount of planes of these `EGLImages`
diff --git a/src/backend/egl/native.rs b/src/backend/egl/native.rs
index 8ffce1d..1864f78 100644
--- a/src/backend/egl/native.rs
+++ b/src/backend/egl/native.rs
@@ -35,6 +35,7 @@ pub trait Backend {
 }
 
 #[cfg(feature = "backend_winit")]
+#[derive(Debug)]
 /// Wayland backend type
 pub enum Wayland {}
 #[cfg(feature = "backend_winit")]
@@ -79,10 +80,12 @@ impl Backend for Wayland {
 }
 
 #[cfg(feature = "backend_winit")]
+#[derive(Debug)]
 /// Typed Xlib window for the `X11` backend
 pub struct XlibWindow(u64);
 #[cfg(feature = "backend_winit")]
 /// X11 backend type
+#[derive(Debug)]
 pub enum X11 {}
 #[cfg(feature = "backend_winit")]
 impl Backend for X11 {
diff --git a/src/backend/egl/surface.rs b/src/backend/egl/surface.rs
index 463f95d..3f4f1f0 100644
--- a/src/backend/egl/surface.rs
+++ b/src/backend/egl/surface.rs
@@ -11,6 +11,7 @@ use std::sync::{
 };
 
 /// EGL surface of a given EGL context for rendering
+#[derive(Debug)]
 pub struct EGLSurface<N: native::NativeSurface> {
     pub(crate) display: Arc<EGLDisplayHandle>,
     native: N,
diff --git a/src/backend/graphics/gl.rs b/src/backend/graphics/gl.rs
index 8aa1fc0..58a4991 100644
--- a/src/backend/graphics/gl.rs
+++ b/src/backend/graphics/gl.rs
@@ -1,6 +1,7 @@
 //! OpenGL rendering types
 
 use nix::libc::c_void;
+use std::fmt;
 
 use super::{PixelFormat, SwapBuffersError};
 
@@ -39,6 +40,15 @@ pub trait GLGraphicsBackend {
 
     /// Returns the pixel format of the main framebuffer of the context.
     fn get_pixel_format(&self) -> PixelFormat;
+
+    /// Formats the debug value using the given formatter.
+    fn debug_fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("GLGraphicsBackend")
+            .field("framebuffer_dimensions", &self.get_framebuffer_dimensions())
+            .field("is_current", &self.is_current())
+            .field("pixel_format", &self.get_pixel_format())
+            .finish()
+    }
 }
 
 /// Loads a Raw GLES Interface for a given [`GLGraphicsBackend`]
diff --git a/src/backend/graphics/glium.rs b/src/backend/graphics/glium.rs
index 4e04f93..d1f7979 100644
--- a/src/backend/graphics/glium.rs
+++ b/src/backend/graphics/glium.rs
@@ -8,6 +8,7 @@ use glium::{
 };
 use std::{
     cell::{Cell, Ref, RefCell, RefMut},
+    fmt,
     os::raw::c_void,
     rc::Rc,
 };
@@ -22,6 +23,16 @@ pub struct GliumGraphicsBackend<T: GLGraphicsBackend> {
     error_channel: Rc<Cell<Option<Box<dyn std::error::Error>>>>,
 }
 
+impl<T: GLGraphicsBackend> fmt::Debug for GliumGraphicsBackend<T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let backend = &self.backend.0.borrow().debug_fmt(f);
+
+        f.debug_struct("GliumGraphicsBackend")
+            .field("backend", backend)
+            .finish()
+    }
+}
+
 struct InternalBackend<T: GLGraphicsBackend>(RefCell<T>, Rc<Cell<Option<Box<dyn std::error::Error>>>>);
 
 impl<T: GLGraphicsBackend + 'static> GliumGraphicsBackend<T> {
diff --git a/src/backend/libinput/mod.rs b/src/backend/libinput/mod.rs
index f14364f..cac97c2 100644
--- a/src/backend/libinput/mod.rs
+++ b/src/backend/libinput/mod.rs
@@ -16,6 +16,7 @@ use input::event;
 use std::path::Path;
 use std::{
     collections::hash_map::HashMap,
+    fmt,
     io::Error as IoError,
     os::unix::io::{AsRawFd, RawFd},
 };
@@ -32,6 +33,7 @@ const INPUT_MAJOR: u32 = 13;
 ///
 /// Tracks input of all devices given manually or via a udev seat to a provided libinput
 /// context.
+#[derive(Debug)]
 pub struct LibinputInputBackend {
     context: libinput::Libinput,
     config: LibinputConfig,
@@ -273,6 +275,7 @@ impl backend::Event for event::touch::TouchFrameEvent {
 impl backend::TouchFrameEvent for event::touch::TouchFrameEvent {}
 
 /// Special events generated by Libinput
+#[derive(Debug)]
 pub enum LibinputEvent {
     /// A new device was plugged in
     NewDevice(libinput::Device),
@@ -284,6 +287,7 @@ pub enum LibinputEvent {
 ///
 /// This type allows you to access the list of know devices to configure them
 /// if relevant
+#[derive(Debug)]
 pub struct LibinputConfig {
     devices: Vec<libinput::Device>,
 }
@@ -423,6 +427,19 @@ impl From<event::pointer::ButtonState> for backend::MouseButtonState {
 #[cfg(feature = "backend_session")]
 pub struct LibinputSessionInterface<S: Session>(S);
 
+#[cfg(feature = "backend_session")]
+impl<S: Session> fmt::Debug for LibinputSessionInterface<S> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let sesion = &f
+            .debug_struct("Session")
+            .field("is_active", &self.0.is_active())
+            .field("seat", &self.0.seat())
+            .finish();
+
+        f.debug_tuple("LibinputSessionInterface").field(sesion).finish()
+    }
+}
+
 #[cfg(feature = "backend_session")]
 impl<S: Session> From<S> for LibinputSessionInterface<S> {
     fn from(session: S) -> LibinputSessionInterface<S> {
diff --git a/src/backend/session/auto.rs b/src/backend/session/auto.rs
index 289e83b..94ff4ae 100644
--- a/src/backend/session/auto.rs
+++ b/src/backend/session/auto.rs
@@ -44,7 +44,7 @@ use std::{cell::RefCell, io, os::unix::io::RawFd, path::Path, rc::Rc};
 use calloop::{EventSource, Poll, Readiness, Token};
 
 /// [`Session`] using the best available interface
-#[derive(Clone)]
+#[derive(Debug, Clone)]
 pub enum AutoSession {
     /// Logind session
     #[cfg(feature = "backend_session_logind")]
@@ -54,6 +54,7 @@ pub enum AutoSession {
 }
 
 /// [`SessionNotifier`] using the best available interface
+#[derive(Debug)]
 pub enum AutoSessionNotifier {
     /// Logind session notifier
     #[cfg(feature = "backend_session_logind")]
diff --git a/src/backend/session/dbus/logind.rs b/src/backend/session/dbus/logind.rs
index 44ff53d..6294e19 100644
--- a/src/backend/session/dbus/logind.rs
+++ b/src/backend/session/dbus/logind.rs
@@ -49,6 +49,7 @@ use nix::{
 };
 use std::{
     cell::RefCell,
+    fmt,
     io::Error as IoError,
     os::unix::io::RawFd,
     path::Path,
@@ -70,15 +71,29 @@ struct LogindSessionImpl {
     logger: ::slog::Logger,
 }
 
+impl fmt::Debug for LogindSessionImpl {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("LogindSessionImpl ")
+            .field("session_id", &self.session_id)
+            .field("conn", &"..")
+            .field("session_path", &self.session_path)
+            .field("active", &self.active)
+            .field("signaler", &self.signaler)
+            .field("seat", &self.seat)
+            .field("logger", &self.logger)
+            .finish()
+    }
+}
+
 /// [`Session`] via the logind dbus interface
-#[derive(Clone)]
+#[derive(Debug, Clone)]
 pub struct LogindSession {
     internal: Weak<LogindSessionImpl>,
     seat: String,
 }
 
 /// [`SessionNotifier`] via the logind dbus interface
-#[derive(Clone)]
+#[derive(Debug, Clone)]
 pub struct LogindSessionNotifier {
     internal: Rc<LogindSessionImpl>,
 }
diff --git a/src/backend/session/direct.rs b/src/backend/session/direct.rs
index 3eaae76..f84d5c8 100644
--- a/src/backend/session/direct.rs
+++ b/src/backend/session/direct.rs
@@ -57,6 +57,7 @@ use nix::{
     Error as NixError, Result as NixResult,
 };
 use std::{
+    fmt,
     os::unix::io::RawFd,
     path::Path,
     sync::{
@@ -142,6 +143,7 @@ fn is_tty_device(dev: dev_t, path: Option<&Path>) -> bool {
 }
 
 /// [`Session`] via the virtual terminal direct kernel interface
+#[derive(Debug)]
 pub struct DirectSession {
     tty: RawFd,
     active: Arc<AtomicBool>,
@@ -160,6 +162,25 @@ pub struct DirectSessionNotifier {
     source: Option<Signals>,
 }
 
+impl fmt::Debug for DirectSessionNotifier {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("Point")
+            .field("tty", &self.tty)
+            .field("active", &self.active)
+            .field("signaler", &self.signaler)
+            .field("signal", &self.signal)
+            .field("logger", &self.logger)
+            .field(
+                "source",
+                &match self.source {
+                    Some(_) => "Some(..)",
+                    None => "None",
+                },
+            )
+            .finish()
+    }
+}
+
 impl DirectSession {
     /// Tries to create a new session via the legacy virtual terminal interface.
     ///