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libratbag/doc/dbus.rst
Peter Hutterer 6000688c30 ratbagd: add GetSvgFd() to return an fd to the SVG 
If we're sandboxing the client we don't have access to the SVG files directly.
So pass a read-only file descriptor to the client over DBus and let them deal
with the SVG that way.

In ratbagd.py we pull the fd off but we convert the quirky dbus error into a
normal FileNotFoundError(), much easier to catch in the caller.

On the ratbagctl side we now have to search the SVG for it's name - stored in
the 'sodipodi:docname' attribute by Inkspace. This isn't guaranteed to exist
or be always correct, but meh, it's close enough. We could continue to use the
GetSvg() call here but I want to deprecate that and remove it in the near
future.

Fixes #521

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
2018-09-05 08:31:35 +10:00

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********
DBus API
********
Note: **the DBus interface is subject to change**
Interfaces:
* org.freedesktop.ratbag1.Manager
* org.freedesktop.ratbag1.Device
* org.freedesktop.ratbag1.Profile
* org.freedesktop.ratbag1.Resolution
* org.freedesktop.ratbag1.Button
* org.freedesktop.ratbag1.Led
For a list of dbus types as used below, see https://dbus.freedesktop.org/doc/dbus-specification.html
Properties marked as **constant** do not change for the lifetime of the
object. Properties marked as **mutable** may change, and a
``org.freedesktop.DBus.Properties.PropertyChanged`` signal is sent for those
unless otherwise specified.
All setters (whether implicit for read-write properties or explicit) return
success instead of the internal return value because DBus does not like
non-standard error values. Upon a ratbag error, the `Resync` signal is emitted
on the device, indicating that clients should resync their values.
Values listed as enums are defined in `libratbag-enums.h <https://github.com/libratbag/libratbag/blob/master/src/libratbag-enums.h>`_
org.freedesktop.ratbag1.Manager
-------------------------------
.. js:class:: Manager
The **org.freedesktop.ratbag1.Manager** interface is the entry point to
interact with ratbagd.
.. js:attribute:: Devices
:type: ao
An array of read-only **object paths** to :js:class:`Device` objects
.. js:attribute:: Themes
:type: as
:flags: read-only, constant
Provides the list of available theme names. This list is guaranteed to have
one theme available ('default'). Other themes are implementation defined.
A theme listed here is only a guarantee that the theme is known to libratbag
and that SVGs *may* exist, it is not a guarantee that the SVG for any
specific device exists. In other words, a device may not have an SVG for a
specific theme.
This list is static for the lifetime of ratbagd.
org.freedesktop.ratbag1.Device
-------------------------------
.. js:class:: Device
The **org.freedesktop.ratbag1.Device** interface describes a single device
known to ratbagd.
.. js:attribute:: Id
:type: as
:flags: read-only, constant
An ID describing this device. This ID should not be used for presentation to
the user. This ID is unique for the device for the lifetime of the device
but may be recycled when the device is removed. No guarantee is given for
the content of the ID, the client should treat it as an opaque string.
.. js:attribute:: Description
:type: s
:flags: read-only, constant
The device's name, suitable for presentation to the user.
.. js:attribute:: Capabilities
:type: au
:flags: read-only, constant
The capabilities supported by this device. see `enum
ratbag_device_capability` in libratbag-enums.h for the list of permissible
capabilities.
.. js:attribute:: Svg
:type: s
:flags: read-only, constant
The device's SVG file name, without path.
.. js:attribute:: Profiles
:type: ao
:flags: read-only, mutable
This property is mutable if the device supports adding and removing
profiles.
Provides the list of profile paths for all profiles on this device, see
:js:class:`Profile`.
.. js:function:: Commit() → ()
Commits the changes to the device. Changes to the device are batched; they
are not written to the hardware until :js:func:`Commit()` is invoked.
.. js:function:: GetSvg(s) → (s)
:param s: the theme name
:returns: A full path to the SVG for the given theme
Returns the full path to the SVG for the given theme or an
empty string if none is available. The theme must be one of
:js:attr:`Themes`.
The theme **'default'** is guaranteed to be available.
ratbagd may return the path to a file that doesn't exist.
This is the case if the device has SVGs available but not
for the given theme.
.. js:function:: GetSvgFd(s) → (h)
:param s: the theme name
:returns: An open file descriptor to the SVG for the given theme
Returns an open file descriptor to the SVG for the given theme or an
errno on error. The theme must be one of :js:attr:`Themes`.
The theme **'default'** is guaranteed to be available.
ratbagd may return ENOENT if a file doesn't exist.
This is the case if the device has SVGs available but not
for the given theme.
.. js:function:: Resync()
:type: Signal
Emitted when an internal error occurs. Upon receiving this
signal, clients are expected to resync their values with
ratbagd.
org.freedesktop.ratbag1.Profile
-------------------------------
.. js:class:: Profile
.. js:attribute:: Index
:type: u
:flags: read-only, constant
The index of this profile
.. js:attribute:: Name
:type: s
:flags: read-write, mutable
The name of this profile.
.. js:attribute:: Enabled
:type: b
:flags: read-write, mutable
True if this is the profile is enabled, false otherwise.
Note that a disabled profile might not have correct bindings, so it's
a good thing to rebind everything before calling :js:func:`Commit()` on the
:js:class:`Device`.
.. js:attribute:: Resolutions
:type: ao
:flags: read-only, mutable
This property is mutable if the device supports adding and removing
resolutions.
Provides the object paths of all resolutions in this profile, see
:js:class:`Resolution`
.. js:attribute:: Buttons
:type: ao
:flags: read-only, constant
Provides the object paths of all buttons in this profile, see
:js:class:`Button`
.. js:attribute:: Leds
:type: ao
:flags: read-only, constant
Provides the object paths of all LEDs in this profile, see
:js:class:`Led`
.. js:attribute:: IsActive
:type: b
:flags: read-only, mutable
True if this is the currently active profile, false otherwise.
Profiles can only be set to active, but never to not active - at least one
profile must be active at all times. This property is read-only, use the
:js:func:`SetActive()` method to activate a profile.
.. js:function:: SetActive() → ()
Set this profile to be the active profile
org.freedesktop.ratbag1.Resolution
----------------------------------
.. js:class:: Resolution
.. js:attribute:: Index
:type: u
:flags: read-only, constant
Index of the resolution
.. js:attribute:: Capabilities
:type: au
:flags: read-only, constant
Array of uints from the ratbag\_resolution\_capability from libratbag.h.
.. js:attribute:: IsActive
:type: b
:flags: read-only, mutable
True if this is the currently active resolution, false otherwise.
Resolutions can only be set to active, but never to not
active - at least one resoultion must be active at all
times. This property is read-only, use the
:js:func:`SetActive()` method to set a resolution as the
active resolution.
.. js:attribute:: IsDefault
:type: b
:flags: read-only, mutable
True if this is the currently default resolution, false
otherwise. If the device does not have the default
resolution capability, this property is always false.
Resolutions can only be set to default, but never to not
default - at least one resolution must be default at all
times. This property is read-only, use the
:js:func:`SetDefault()` method to set a resolution as
the default resolution.
.. js:attribute:: Resolution
:type: uu
:flags: read-write, mutable
uint for the x and y resolution assigned to this entry,
respectively. The value for the resolution must be equal to
one of the values in :js:attr:`Resolutions`.
If the resolution does not support separate x/y resolutions,
x and y must be the same value.
.. js:attribute:: Resolutions
:type: au
:flags: read-only, constant
A list of permitted resolutions. Values in this list may be used in
the :js:attr:`Resolution` property. This list is always sorted
ascending, the lowest resolution is the first item in the list.
This list may be empty if the device does not support reading and/or
writing to resolutions.
.. js:attribute:: ReportRate
:type: u
:flags: read-write, mutable
uint for the report rate in Hz assigned to this entry
If the resolution does not have the individual report rate
capability, changing the report rate on one resolution will
change the report rate on all resolutions.
.. js:attribute:: ReportRates
:type: au
:flags: read-write, constant
A list of permitted report rates. Values in this list may be used
in the :js:attr:`ReportRate` property. This list is always sorted
ascending, the lowest report rate is the first item in the list.
This list may be empty if the device does not support reading and/or
writing to resolutions.
.. js:function:: SetDefault() → ()
Set this resolution to be the default
.. js:function:: SetActive() → ()
Set this resolution to be the active one
org.freedesktop.ratbag1.Button
------------------------------
.. js:class:: Button
.. js:attribute:: Index
:type: u
:flags: read-only, constant
Index of the button
.. js:attribute:: Type
:type: u
:flags: read-only, constant
Enum describing the button physical type, see
:cpp:enum:`ratbag_button_type`. This type is unrelated to the
logical button mapping and serves to easily identify the button on
the device.
.. js:attribute:: ButtonMapping
:type: u
:flags: read-write, mutable
uint of the current button mapping (if mapping to button)
.. js:attribute:: SpecialMapping
:type: u
:flags: read-write, mutable
Enum describing the current special mapping (if mapped to special)
.. js:attribute:: Macro
:type: a(uu)
:flags: read-write, mutable
Array of (type, keycode), where type may be one of
:cpp:enumerator:`RATBAG_MACRO_EVENT_KEY_PRESSED` or
:cpp:enumerator:`RATBAG_MACRO_EVENT_KEY_RELEASED`.
.. js:attribute:: ActionType
:type: u
:flags: read-only, mutable
An enum describing the action type of the button, see
:cpp:enum:`ratbag_button_action_type` for the list of enums.
This decides which one of :js:attr:`ButtonMapping`,
:js:attr:`SpecialMapping` and :js:attr:`Macro` has a value.
.. js:attribute:: ActionTypes
:type: au
:flags: read-only, constant
Array of :cpp:enum:`ratbag_button_action_type`, possible values
for ActionType on the current device
.. js:function:: Disable() → ()
Disable this button
org.freedesktop.ratbag1.Led
---------------------------
.. js:class:: Led
.. js:attribute:: Index
:type: u
:flags: read-only, constant
Index of the LED
.. js:attribute:: Mode
:type: u
:flags: read-write, mutable
uint mapping to the mode enum from libratbag
.. js:attribute:: Modes
:type: au
:flags: read-only, constant
A list of modes supported by this LED
.. js:attribute:: Type
:type: u
:flags: read-only, mutable
enum describing the LED type
.. js:attribute:: Color
:type: (uuu)
:flags: read-write, mutable
uint triplet (RGB) of the LED's color
.. js:attribute:: ColorDepth
:type: u
:flags: read-only, constant
The color depth of this LED as one of the constants in libratbag-enums.h
.. js:attribute:: EffectDuration
:type: u
:flags: read-write, mutable
The effect duration in ms, possible values are in the range 0 - 10000
.. js:attribute:: Brightness
:type: u
:flags: read-write, mutable
The brightness of the LED, possible values are in the range 0 - 255
For easier debugging, objects paths are constructed from the device. e.g.
`/org/freedesktop/ratbag/button/event5/p0/b10` is the button interface for
button 10 on profile 0 on event5. The naming is subject to change. Do not
rely on a constructed object path in your application.
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