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Home Page: https://pub.dev/packages/dbus
License: Mozilla Public License 2.0
Native Dart client library to use DBus.
Home Page: https://pub.dev/packages/dbus
License: Mozilla Public License 2.0
It's a matter of taste, but I personally like the convention that generated Dart files usually contain a header comment stating that the file was generated, and that should not be edited. What they usually miss, though, is any info on how the file was generated, or where it originates from. It would be awesome to have something like:
// DO NOT EDIT. THIS FILE IS GENERATED.
// dart-dbus generate-remote-object org.freedesktop.FooBar.xml
DBusObject.client is a variable and can be modified by an API user. It's required to emit signals, but should ideally be hidden or made final.
D-Bus interfaces are defined in XML, it would be nice to automatically generate Dart code from these like gdbus-codegen does.
Change DBusObject.path from property to a constructor parameter. It shouldn't change after object creation and this will be simpler.
Not in the DBus spec, but standard XML?
Add a DBusMethodCallContext to method call handlers - it can contain details about the call that aren't normally used.
We should bunch up any API changes for the 0.3.0 release.
This code take quite a long time to end. Any hints what I'm doing wrong?
void runDbus() async {
var client = DBusClient.system();
var object = DBusRemoteObject(client, 'org.freedesktop.ModemManager1',
DBusObjectPath('/org/freedesktop/ModemManager1'));
var values = <DBusValue>[];
var response = await object.callMethod("org.freedesktop.DBus.ObjectManager",
'GetManagedObjects', values);
var result_array = response.returnValues;
print('Closing');
var f1 = client.close();
await f1;
print('Done');
}
Make DBusStruct.children a list, easier to index (still use iterator as input).
Add an org.freedesktop.DBus.Dart.Symbol (or similar) that behaves like org.freedesktop.DBus.GLib.CSymbol and allows the method names to be overridden.
Generated read-write remote-object properties are broken. Async getters returning Future are not compatible with setters, that cannot be async, by the same name.
$ dart-dbus generate-remote-object org.freedesktop.NetworkManager.Device.xml # [1]
=>
/// Gets org.freedesktop.NetworkManager.Device.Managed
Future<bool> get Managed async {
var value = await getProperty('org.freedesktop.NetworkManager.Device', 'Managed');
return (value as DBusBoolean).value;
}
/// Sets org.freedesktop.NetworkManager.Device.Managed
set Managed (bool value) {
setProperty('org.freedesktop.NetworkManager.Device', 'Managed', DBusBoolean(value));
}
=>
The return type of getter 'Managed' is 'Future' which isn't assignable to the type 'bool' of its setter 'Managed'. Try changing the types so that they are compatible.
Hi!
I was trying to interface with the NetworkManger via dbus to provide linux implementation for the flutter connectivity
plugin.
The source code can be found here.
https://github.com/fluttercommunity/firebase_dart_sdk/blob/1dc2373b9524b8a429d6bad32a127eb497fc7b0f/connectivity_linux/lib/connectivity_linux.dart#L81
Note: This only happens when I run the flutter app. When I run it as a simple dart app everything worked well.
Thank you.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.5 LTS
Release: 18.04
Codename: bionic
Launching lib/main.dart on Linux in debug mode...
Building Linux application...
Waiting for Linux to report its views...
Debug service listening on ws://127.0.0.1:46223/qySq3Oyb90M=/ws
Syncing files to device Linux...
[ERROR:flutter/lib/ui/ui_dart_state.cc(171)] Unhandled Exception: Unknown DBus data type '5fc6b82c95f466712
l���� � = ��s � :1.297 ��u � �g �s ��s � org.freedesktop.DBus '
#0 DBusReadBuffer.readDBusValue (package:dbus/src/dbus_read_buffer.dart:253:7)
#1 DBusReadBuffer.readDBusVariant (package:dbus/src/dbus_read_buffer.dart:160:22)
#2 DBusReadBuffer.readDBusValue (package:dbus/src/dbus_read_buffer.dart:239:14)
#3 DBusReadBuffer.readDBusStruct (package:dbus/src/dbus_read_buffer.dart:169:19)
#4 DBusReadBuffer.readDBusValue (package:dbus/src/dbus_read_buffer.dart:251:14)
#5 DBusReadBuffer.readDBusArray (package:dbus/src/dbus_read_buffer.dart:184:19)
#6 DBusMessage.unmarshal (package:dbus/src/dbus_message.dart:125:26)
#7 DBusClient._processMessages (package:dbus/src/dbus_client.dart:488:18)
#8 DBusClient._processData (package:dbus/src/dbus_client.dart:463:20)
#9 _rootRunUnary (dart:async/zone.dart:1198:47)
#10 _CustomZone.runUnary (dart:async/zone.dart:1100:19)
#11 _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7)
#12 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:357:11)
#13 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:285:7)
#14 _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:808:19)
#15 _StreamController._add (dart:async/stream_controller.dart:682:7)
#16 _StreamController.add (dart:async/stream_controller.dart:624:5)
#17 _Socket._onData (dart:io-patch/socket_patch.dart:2043:41)
#18 _rootRunUnary (dart:async/zone.dart:1206:13)
#19 _CustomZone.runUnary (dart:async/zone.dart:1100:19)
#20 _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7)
#21 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:357:11)
#22 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:285:7)
#23 _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:808:19)
#24 _StreamController._add (dart:async/stream_controller.dart:682:7)
#25 _StreamController.add (dart:async/stream_controller.dart:624:5)
#26 new _RawSocket.<anonymous closure> (dart:io-patch/socket_patch.dart:1579:33)
#27 _NativeSocket.issueReadEvent.issue (dart:io-patch/socket_patch.dart:1075:14)
#28 _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#29 _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
The remote object classes that dart-dbus
generates require the user to do a method call for each property. Optionally we should allow cached properties like we've used in upower.dart. This is similar to what gdbus-codegen
does.
import 'package:dbus/dbus.dart';
void main() async {
var client = DBusClient.system();
var object = DBusRemoteObject(client, 'org.freedesktop.hostname1', DBusObjectPath('/org/freedesktop/hostname1'));
await object.getProperty('org.freedesktop.hostname1', 'Hostname');
await client.close();
}
causes:
Unhandled exception:
Bad state: StreamSink is closed
Needs some sort of checks to properly complete method calls when closed.
The org.freedesktop.DBus.Method.NoReply annotation is used to indicate methods that should not have replies. The generated Dart code should check for this annotation and map it to the DBusMethodCallFlag.noReplyExpected flag and skip checking for responses.
It would be nice to not have the getuid FFI code and instead use some system library to do this.
If a method call returns multiple values, we just expose this as a DBusStruct
. It would be nice to make an object for these return values (might need an annotation to give it a name).
Attempting to close my app makes it freeze, and after a couple of seconds spits out:
Attempt:12 waiting for isolate _read to check in
Attempt:13 waiting for isolate _read to check in
Attempt:14 waiting for isolate _read to check in
Attempt:15 waiting for isolate _read to check in
Attempt:16 waiting for isolate _read to check in
Attempt:17 waiting for isolate _read to check in
Attempt:18 waiting for isolate _read to check in
Attempt:19 waiting for isolate _read to check in
Attempt:20 waiting for isolate _read to check in
Attempt:21 waiting for isolate _read to check in
Attempt:22 waiting for isolate _read to check in
Attempt:23 waiting for isolate _read to check in
Attempt:24 waiting for isolate _read to check in
... (and so on)
Probably need to add a dispose
/close
method, or make it detect the app is exiting somehow
Also, it looks like it's waiting in the read
method of UnixDomainSocket
. Maybe closing the socket will make it exit.
Add an org.freedesktop.DBus.DefaultValue annotation so methods can have default values for args.
This should probably be proposed into the DBus specification.
Consider adding a --org-name option to dart-dbus, which could then strip off D-Bus prefixes to generate better code.
Not a high priority but for symmetry we should consider a D-Bus server implementation. It would then probably make sense to rename the project to dbus.dart, which might be a good time to formalize the API.
DBus is able to send file descriptors, however these are not supported in Dart. We should find a method of making these usable, possibly using an option FFI interface and/or by adding file descriptor support to Dart.
Can you please release a new version that fixes "isInNamespace" check. It seems that currently signals are not being properly send when we create object with DBusObjectPath('/') path
Is an API break
Hi
I've been recently bitten by an update in DBus, as now it seems that syncronous DBus calls receive a Timeout from the server, in about 5 seconds.
The problem happens on Ubuntu 20.04 LTS, with a default install of flutter and dbus 0.5.x. This issue did not happen on dbus 0.3.x
I receive the following unexpected exception from the server:
org.freedesktop.Avahi.TimeoutError: TimeoutReached
As I traced back into my code, this happens when calling the method org.freedesktop.Avahi.Server.ResolveService using the avahi service files.
The stack trace is the following:
00:15 +0: external_api Able to create a discovery without D-Bus complaining Enabling workaround for V1 API with the 100ms wait behavior. Update your Avahi version to 0.8 or later if you want this warning to disappear. 00:17 +3: end-to-end Broadcast name and receive them on service enumeration Enabling workaround for V1 API with the 100ms wait behavior. Update your Avahi version to 0.8 or later if you want this warning to disappear. Cached service received: AvahiServiceBrowserItemNew(path: 'DBusObjectPath('/Client57/ServiceBrowser1')',interface: '2',protocol: 'AvahiProtocol.AVAHI_PROTO_INET6', name: 'ItemNew',type: '_bonsoire2e._tcp',domain: 'local' DBG: AvahiServiceBrowserItemNew(path: 'DBusObjectPath('/Client57/ServiceBrowser1')',interface: '2',protocol: 'AvahiProtocol.AVAHI_PROTO_INET6', name: 'ItemNew',type: '_bonsoire2e._tcp',domain: 'local' Item added! AvahiServiceBrowserItemNew(path: 'DBusObjectPath('/Client57/ServiceBrowser1')',interface: '2',protocol: 'AvahiProtocol.AVAHI_PROTO_INET6', name: 'ItemNew',type: '_bonsoire2e._tcp',domain: 'local' DBG: AvahiServiceBrowserItemNew(path: 'DBusObjectPath('/Client57/ServiceBrowser1')',interface: '2',protocol: 'AvahiProtocol.AVAHI_PROTO_INET6', name: 'ItemNew',type: '_bonsoire2e._tcp',domain: 'local' Cached service received: AvahiServiceBrowserItemNew(path: 'DBusObjectPath('/Client57/ServiceBrowser1')',interface: '2',protocol: 'AvahiProtocol.AVAHI_PROTO_INET', name: 'ItemNew',type: '_bonsoire2e._tcp',domain: 'local' DBG: AvahiServiceBrowserItemNew(path: 'DBusObjectPath('/Client57/ServiceBrowser1')',interface: '2',protocol: 'AvahiProtocol.AVAHI_PROTO_INET', name: 'ItemNew',type: '_bonsoire2e._tcp',domain: 'local' Item added! AvahiServiceBrowserItemNew(path: 'DBusObjectPath('/Client57/ServiceBrowser1')',interface: '2',protocol: 'AvahiProtocol.AVAHI_PROTO_INET', name: 'ItemNew',type: '_bonsoire2e._tcp',domain: 'local' DBG: AvahiServiceBrowserItemNew(path: 'DBusObjectPath('/Client57/ServiceBrowser1')',interface: '2',protocol: 'AvahiProtocol.AVAHI_PROTO_INET', name: 'ItemNew',type: '_bonsoire2e._tcp',domain: 'local' Cached service received: AvahiServiceBrowserItemNew(path: 'DBusObjectPath('/Client57/ServiceBrowser1')',interface: '1',protocol: 'AvahiProtocol.AVAHI_PROTO_INET', name: 'ItemNew',type: '_bonsoire2e._tcp',domain: 'local' DBG: AvahiServiceBrowserItemNew(path: 'DBusObjectPath('/Client57/ServiceBrowser1')',interface: '1',protocol: 'AvahiProtocol.AVAHI_PROTO_INET', name: 'ItemNew',type: '_bonsoire2e._tcp',domain: 'local' Item added! AvahiServiceBrowserItemNew(path: 'DBusObjectPath('/Client57/ServiceBrowser1')',interface: '1',protocol: 'AvahiProtocol.AVAHI_PROTO_INET', name: 'ItemNew',type: '_bonsoire2e._tcp',domain: 'local' DBG: AvahiServiceBrowserItemNew(path: 'DBusObjectPath('/Client57/ServiceBrowser1')',interface: '1',protocol: 'AvahiProtocol.AVAHI_PROTO_INET', name: 'ItemNew',type: '_bonsoire2e._tcp',domain: 'local' 00:22 +3 -1: end-to-end Broadcast name and receive them on service enumeration [E] org.freedesktop.Avahi.TimeoutError: Timeout reached package:dbus/src/dbus_client.dart 1067:7 DBusClient._callMethod ===== asynchronous gap =========================== dart:async _asyncErrorWrapperHelper package:bonsoir_linux_dbus/src/linux_dbus_bonsoir_discovery.dart 49:13 LinuxDBusBonsoirDiscovery.ready.<fn> ===== asynchronous gap =========================== dart:async _StreamImpl.listen package:dbus/src/dbus_client.dart 126:31 DBusSignalStream.listen package:bonsoir_linux_dbus/src/linux_dbus_bonsoir_discovery.dart 39:12 LinuxDBusBonsoirDiscovery.ready ===== asynchronous gap =========================== dart:async _asyncThenWrapperHelper test/bonsoir_linux_dbus_test.dart 70:48 main.<fn>.<fn> test/bonsoir_linux_dbus_test.dart 61:68 main.<fn>.<fn> org.freedesktop.Avahi.TimeoutError: Timeout reached package:dbus/src/dbus_client.dart 1067:7 DBusClient._callMethod ===== asynchronous gap =========================== dart:async _asyncErrorWrapperHelper package:bonsoir_linux_dbus/src/linux_dbus_bonsoir_discovery.dart 84:7 LinuxDBusBonsoirDiscovery.start.<fn> package:bonsoir_linux_dbus/src/linux_dbus_bonsoir_discovery.dart 76:57 LinuxDBusBonsoirDiscovery.start.<fn> ===== asynchronous gap =========================== dart:async _ForwardingStream.listen package:bonsoir_linux_dbus/src/linux_dbus_bonsoir_discovery.dart 76:50 LinuxDBusBonsoirDiscovery.start test/bonsoir_linux_dbus_test.dart 121:50 main.<fn>.<fn> ===== asynchronous gap =========================== dart:async _asyncThenWrapperHelper test/bonsoir_linux_dbus_test.dart main.<fn>.<fn> org.freedesktop.Avahi.TimeoutError: Timeout reached package:dbus/src/dbus_client.dart 1067:7 DBusClient._callMethod ===== asynchronous gap =========================== dart:async _asyncErrorWrapperHelper package:bonsoir_linux_dbus/src/linux_dbus_bonsoir_discovery.dart 49:13 LinuxDBusBonsoirDiscovery.ready.<fn> ===== asynchronous gap =========================== dart:async _StreamImpl.listen package:dbus/src/dbus_client.dart 126:31 DBusSignalStream.listen package:bonsoir_linux_dbus/src/linux_dbus_bonsoir_discovery.dart 39:12 LinuxDBusBonsoirDiscovery.ready ===== asynchronous gap =========================== dart:async _asyncThenWrapperHelper test/bonsoir_linux_dbus_test.dart 70:48 main.<fn>.<fn> test/bonsoir_linux_dbus_test.dart 61:68 main.<fn>.<fn> org.freedesktop.Avahi.TimeoutError: Timeout reached package:dbus/src/dbus_client.dart 1067:7 DBusClient._callMethod ===== asynchronous gap =========================== dart:async _asyncErrorWrapperHelper package:bonsoir_linux_dbus/src/linux_dbus_bonsoir_discovery.dart 84:7 LinuxDBusBonsoirDiscovery.start.<fn> package:bonsoir_linux_dbus/src/linux_dbus_bonsoir_discovery.dart 76:57 LinuxDBusBonsoirDiscovery.start.<fn> ===== asynchronous gap =========================== dart:async _ForwardingStream.listen package:bonsoir_linux_dbus/src/linux_dbus_bonsoir_discovery.dart 76:50 LinuxDBusBonsoirDiscovery.start test/bonsoir_linux_dbus_test.dart 121:50 main.<fn>.<fn> ===== asynchronous gap =========================== dart:async _asyncThenWrapperHelper test/bonsoir_linux_dbus_test.dart main.<fn>.<fn> org.freedesktop.Avahi.TimeoutError: Timeout reached package:dbus/src/dbus_client.dart 1067:7 DBusClient._callMethod ===== asynchronous gap =========================== dart:async _asyncErrorWrapperHelper package:bonsoir_linux_dbus/src/linux_dbus_bonsoir_discovery.dart 49:13 LinuxDBusBonsoirDiscovery.ready.<fn> ===== asynchronous gap =========================== dart:async _StreamImpl.listen package:dbus/src/dbus_client.dart 126:31 DBusSignalStream.listen package:bonsoir_linux_dbus/src/linux_dbus_bonsoir_discovery.dart 39:12 LinuxDBusBonsoirDiscovery.ready ===== asynchronous gap =========================== dart:async _asyncThenWrapperHelper test/bonsoir_linux_dbus_test.dart 70:48 main.<fn>.<fn> test/bonsoir_linux_dbus_test.dart 61:68 main.<fn>.<fn> org.freedesktop.Avahi.TimeoutError: Timeout reached package:dbus/src/dbus_client.dart 1067:7 DBusClient._callMethod ===== asynchronous gap =========================== dart:async _asyncErrorWrapperHelper package:bonsoir_linux_dbus/src/linux_dbus_bonsoir_discovery.dart 84:7 LinuxDBusBonsoirDiscovery.start.<fn> package:bonsoir_linux_dbus/src/linux_dbus_bonsoir_discovery.dart 76:57 LinuxDBusBonsoirDiscovery.start.<fn> ===== asynchronous gap =========================== dart:async _ForwardingStream.listen package:bonsoir_linux_dbus/src/linux_dbus_bonsoir_discovery.dart 76:50 LinuxDBusBonsoirDiscovery.start test/bonsoir_linux_dbus_test.dart 121:50 main.<fn>.<fn> ===== asynchronous gap =========================== dart:async _asyncThenWrapperHelper test/bonsoir_linux_dbus_test.dart main.<fn>.<fn> 00:23 +3 -1: Some tests failed.
My test file and entire source code is public at https://github.com/Piero512/bonsoir_linux_dbus
It seems like DBus is missing a timeout parameter for the method call and now that it parses the error messages correctly, this happens.
DBusClient
DBusRemoteObject
DBusRemoteObject.getProperty()
DBusClient
=> Often results to: Unhandled Exception: Bad state: StreamSink is closed
due to an internal NameOwnerChanged
signal subscription and an attempt to call Socket.add()
after closing it.
import 'package:dbus/dbus.dart';
void main() async {
final systemBus = DBusClient.system();
final remoteObject = DBusRemoteObject(
systemBus,
'org.freedesktop.UPower',
DBusObjectPath('/org/freedesktop/UPower/devices/DisplayDevice'),
);
await remoteObject.getProperty('org.freedesktop.UPower.Device', 'Percentage');
systemBus.close();
}
[ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: Bad state: StreamSink is closed
#0 _StreamSinkImpl.add (dart:io/io_sink.dart:154:7))
#1 _Socket.add (dart:io-patch/socket_patch.dart:1848:38))
#2 DBusClient._sendMessage package:dbus/src/dbus_client.dart:707
<asynchronous suspension>
#3 DBusClient._sendMethodCall package:dbus/src/dbus_client.dart:655
#4 DBusClient._callMethod package:dbus/src/dbus_client.dart:633
#5 DBusClient.callMethod package:dbus/src/dbus_client.dart:276
#6 DBusClient._addMatch package:dbus/src/dbus_client.dart:447
#7 _DBusSignalSubscription.onListen package:dbus/src/dbus_client.dart:67
#8 _runGuarded (dart:async/stream_controller.dart:847:24))
#9 _StreamController._subscribe.<anonymous closure> (dart:async/stream_controller.dart:726:7))
#10 _BufferingStreamSubscription._guardCallback (dart:async/stream_impl.dart:435:13))
#11 _StreamController._subscribe (dart:async/stream_controller.dart:725:18))
#12 _ControllerStream._createSubscription (dart:async/stream_controller.dart:860:19))
#13 _StreamImpl.listen (dart:async/stream_impl.dart:493:9))
#14 _StreamIterator._initializeOrDone (dart:async/stream_impl.dart:1041:30))
#15 _StreamIterator.moveNext (dart:async/stream_impl.dart:1028:12))
#16 DBusClient.subscribeSignals (package:dbus/src/dbus_client.dart)
<asynchronous suspension>
#17 DBusClient._connect package:dbus/src/dbus_client.dart:395
<asynchronous suspension>
#18 DBusClient._sendMessage package:dbus/src/dbus_client.dart:703
#19 DBusClient._sendMethodCall package:dbus/src/dbus_client.dart:655
#20 DBusClient._callMethod package:dbus/src/dbus_client.dart:633
#21 DBusClient.callMethod package:dbus/src/dbus_client.dart:276
#22 DBusRemoteObject.getProperty package:dbus/src/dbus_remote_object.dart:83
#23 main
From the spec:
"A DICT_ENTRY works exactly like a struct, but rather than parentheses it uses curly braces, and it has more restrictions. The restrictions are: it occurs only as an array element type; it has exactly two single complete types inside the curly braces; the first single complete type (the "key") must be a basic type rather than a container type. Implementations must not accept dict entries outside of arrays, must not accept dict entries with zero, one, or more than two fields, and must not accept dict entries with non-basic-typed keys. A dict entry is always a key-value pair."
NetworkManager has some annoying deprecated PropertiesChanged
signals, which are causing naming conflicts with DBusRemoteObject.subscribePropertiesChanged()
.
For example:
$ dart-dbus generate-remote-object org.freedesktop.NetworkManager.xml
=>
/// Subscribes to org.freedesktop.NetworkManager.PropertiesChanged
Future<DBusSignalSubscription> subscribePropertiesChanged(void Function(Map<String, DBusValue> properties) callback) async {
return await subscribeSignal('org.freedesktop.NetworkManager', 'PropertiesChanged', (values) {
if (values.length == 1 && values[0].signature == DBusSignature('a{sv}')) {
callback((values[0] as DBusDict).children.map((key, value) => MapEntry((key as DBusString).value, (value as DBusVariant).value)));
}
});
}
=>
'OrgFreedesktopNetworkManager.subscribePropertiesChanged' ('Future Function(void Function(Map<String, DBusValue>))') isn't a valid override of 'DBusRemoteObject.subscribePropertiesChanged' ('Future Function(void Function(String, Map<String, DBusValue>, List))').
Currently you register callbacks to handle signals:
var client = DBusClient.session();
var subscription = await client.subscribeSignals((path, interface, member, values) {
var count = (values[0] as DBusUint64).value;
print('Ping ${count}!');
}, sender: 'com.example.DartTest');
...
client.unsubscribeSignals();
I think the more Dart way of doing things is to use a stream, which would give an API like this:
var stream = await client.subscribeSignals(sender: 'com.example.DartTest');
await for (signal in stream) {
var count = (signal.values[0] as DBusUint64).value;
print('Ping ${count}!')
}
or with callbacks:
var stream = await client.subscribeSignals(sender: 'com.example.DartTest');
var subscription = stream.listen((signal) {
var count = (signal.values[0] as DBusUint64).value;
print('Ping ${count}!')
});
...
subscription.cancel();
Hello! 👋
We use dbus
on the Linux implementations of the battery_plus
, connectivity_plus
and network_info_plus
Flutter packages, located here: https://github.com/fluttercommunity/plus_plugins, and we are currently migrating them to null safety.
Unfortunately this is blocking us.
Do you have any plans on migrating the package to null safety?
I am happy to help with the task. I will try to send you a PR with the changes I think are necessary, but I would definitely need your assistance.
Should only allow name requests on names that aren't unique (e.g. :23
) and are valid.
With the help of example/signal.dart
, I was able to write this function but still no value is being recieved from it.
var client = DBusClient.system();
var object = DBusRemoteObject(
client,
'org.freedesktop.UPower',
DBusObjectPath('/org/freedesktop/UPower/devices/DisplayDevice'),
);
var stream = object.subscribeSignal('org.freedesktop.UPower.Device', 'State');
await for (var signal in stream) {
var state = (signal.values[0] as DBusUint64).value;
print('State is : $state!');
}
Any chance to bump the version to 0.0.1?
$ pub publish --dry-run
[foo_bar]: Publishing foo x.y.z to https://pub.dartlang.org:
[...]
[foo_bar]: Package validation found the following potential issue:
[foo_bar]: * Packages dependent on a pre-release of another package should themselves be published as a pre-release version. If this package needs dbus version 0.0.0-dev.23, consider publishing the package as a pre-release instead.
[foo_bar]: See https://dart.dev/tools/pub/publishing#publishing-prereleases For more information on pre-releases.
[foo_bar]:
[foo_bar]: Package has 1 warning.
Hi
Today I was writing some tests on my package that uses this package and I noticed some stuff has changed a little.
In the past, I used to call a method that received no parameters and returned nothing (precisely, org.freedesktop.Avahi.ServiceBrowser.Start()) which in the past didn't throw an exception when calling this method on Avahi versions lesser than 0.8.
I was wondering, that since that method was added to the Avahi D-Bus API with the express purpose of being backward-compatible with old versions of Avahi (Ubuntu 20.04 LTS currently ships version 0.7).Is there a way I can get the old nothing happens behavior explicitly?
Most of the interfacing code is autogenerated from Avahi xml file definitions, but I keep my own changes on those generated classes.
/// Invokes org.freedesktop.Avahi.ServiceBrowser.Start()
Future<void> callStart() async {
var result = await callMethod('org.freedesktop.Avahi.ServiceBrowser', 'Start', []);
if (result.signature != DBusSignature('')) {
throw 'org.freedesktop.Avahi.ServiceBrowser.Start returned invalid values \${result.values}';
}
}
This on my tests throws the following exception
Expected: null
Actual: DBusMethodResponseException:<org.freedesktop.DBus.Error.UnknownMethod: Method "Start" with signature "" on interface "org.freedesktop.Avahi.ServiceBrowser" doesn't exist
>
Expected no exceptions. Check if the service exists on the platform or the code broke
In case you wanted to replicate this issue, the code that triggers I suspect is
https://github.com/Piero512/bonsoir_linux_dbus/blob/main/lib/src/linux_dbus_bonsoir_discovery.dart#L61-L107
Required using SO_PEERCRED, which is not currently available in Dart.
I am working on a plugin which fetches battery percentage and status from linux platform. It's dbus interface definition is :
<node name="/org/freedesktop/UPower/devices/DisplayDevice">
<interface name="org.freedesktop.UPower.Device">
<property name="Percentage" type="d" access="read" />
<signal name="State" type="n" />
</interface>
</node>
And generated dart file is :
import 'package:dbus/dbus.dart';
class OrgFreedesktopUPowerDevicesDisplayDevice extends DBusRemoteObject {
OrgFreedesktopUPowerDevicesDisplayDevice(
DBusClient client, String destination,
{DBusObjectPath path = const DBusObjectPath.unchecked(
'/org/freedesktop/UPower/devices/DisplayDevice')})
: super(client, destination, path);
/// Gets org.freedesktop.UPower.Device.Percentage
Future<double> get percentage async {
var value =
await getProperty('org.freedesktop.UPower.Device', 'Percentage');
return (value as DBusDouble).value;
}
/// Subscribes to org.freedesktop.UPower.Device.State
Future<DBusSignalSubscription> subscribeState(
void Function() callback) async {
return await subscribeSignal('org.freedesktop.UPower.Device', 'State',
(values) {
if (values.length != 0) {
callback();
}
});
}
}
I want to return a Stream from plugin which states the status of battery in linux platform but can't find any documentation to implement it or a method to get it's value from generated subscribeState
function.
Doesn't do a deep compare?
Duplicate names
Names shared between methods/signals/properties
Names that are reserved in dart or dbus.dart
Add API for name acquisition/loss - handle the org.freedesktop.DBus.NameAcquired/NameLost signals and expose them to the user in some way.
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