Replies: 3 comments 14 replies
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Hello @darkipod Does the service you are trying to call have an introspection? You can use the D-Spy to browse the D-Bus clients. If it has introspection when you use the interface generator to generate the Python class. If not you will have to write the class by hand. See examples directory: Interface definition: https://github.com/python-sdbus/python-sdbus/blob/master/examples/simple/example_interface.py Client: https://github.com/python-sdbus/python-sdbus/blob/master/examples/simple/client.py Also see NetworkManager examples: https://github.com/python-sdbus/python-sdbus-networkmanager/tree/master/examples/2.0.0 |
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No but now that I look into it, your hello_world is actually a property, not a method so that may be part of my problem. I am looking over the network manager blocking examples, but quite honestly theres a lot going on and its a bit over my head. |
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Is there anyway I could get a more complete example of the blocking method, I cannot get the blocking example here to do anything either. I tried to implement the server side of this but I was unsuccessful. |
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I will write a blocking example.
Are you trying to use blocking API for a server? Only asyncio supports serving the D-Bus objects. |
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Yes, I wrote the server using asyncio, I didnt think it made sense to use anything else, the server must respond asynchronously... Anyway, I await your example, if I get home before that comes up I will make a github repo with what I tried to do. I am able to call my method using gdbus without issue. So the server works, but the client I was unable to get it to run without throwing errors about an invalid method, much to my confusion. |
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Here is an example of a blocking interface method and property: from __future__ import annotations
import sdbus
# WARN: D-Bus daemon interface is already available under
# `sdbus_block.dbus_daemon` and `sdbus_async.dbus_daemon`.
# This is just an example of implementing it from scratch.
class DaemonExampleInterface(
sdbus.DbusInterfaceCommon,
interface_name="org.freedesktop.DBus",
):
@sdbus.dbus_method(
input_signature="", # Method takes no arguments
result_signature="as", # Method returns a list of strings
method_name="GetId", # Override default method name converter
)
def get_dbus_id(self) -> list[str]:
raise NotImplementedError # The function's body is never used
@sdbus.dbus_property(
property_signature="as", # Property type is a list of strings
# Automatic name converter will convert Python name "interfaces" to
# D-Bus name "Interfaces"
# Uncomment following line to force D-Bus name to a specific value.
# property_name="Interfaces",
)
def interfaces(self) -> list[str]:
raise NotImplementedError # The function's body is never used
def main() -> None:
user_dbus = sdbus.sd_bus_open_user() # Use sd_bus_open_system to open system bus
sdbus.set_default_bus(user_dbus)
daemon = DaemonExampleInterface(
# Service name and object path defined by D-Bus specification
# https://dbus.freedesktop.org/doc/dbus-specification.html#message-bus-messages
service_name="org.freedesktop.DBus",
object_path="/org/freedesktop/DBus",
# Other services will have their own paths. Consult their documentation
# and implementation.
)
# Using method
print("D-Bus id:", daemon.get_dbus_id())
# Using property:
print("Interfaces:", daemon.interfaces)
if __name__ == "__main__":
main()It implements the D-Bus daemon interface that should be available on any D-Bus. |
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Your server in this comment raises the NotImplementedError in the hello world method: #107 (reply in thread) The |
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That makes sense, I changed the hello world method to @dbus_method_async(
input_signature="",
result_signature="s",
)
async def hello_world(self) -> None:
print("Received a call for hello_world method.")
#raise NotImplementedError
return "Hello, World!"This gives me the desired behavior. You have been very helpful and I am so thankful for your time. |
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Use a plain @dbus_method_async(
input_signature="",
result_signature="",
)
async def hello_world(self) -> None:
print("Received a call for hello_world method.")
|
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Also if you switched to returning string you should also switch the Python return type hint: @dbus_method_async(
input_signature="",
result_signature="s",
)
async def hello_world(self) -> str:
print("Received a call for hello_world method.")
return "Hello, World!"This has no effect on runtime but will let you use the type checker like mypy which help eliminate a lot of bugs. |
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Again, thank you so much for your help and your time. I will be posting a repo of some of what Im playing round with so that others can reference it and hopefully that will make it easier for others to learn to use DBus using your library for their projects! |
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I added a blocking variant of the simple example: https://github.com/python-sdbus/python-sdbus/blob/master/examples/simple/client_blocking.py |
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Hello, I am struggling to get a blocking method to work, the example code for the blocking portion of the API doesn't currently call from the example server code and I am unable to figure out how to get it to do so. I also have been unable to find any other examples of anyone doing something similar. My use case is thus:
I have a GTK app (using PyGObject which does not have support for DBus calls natively that I can find) that needs to send user input over DBus to a DBus server. I thought I could build a simple proof of concept for this but I cannot get blocking to do anything. I would rather not use async for this because I dont want to deal with multiple threads (or queues) for no reason. The app does not need to get a response, it only needs to send hello world to the server via a method...
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