dbus

dbus

class platypush.plugins.dbus.BusType(value)[source]

An enumeration.

class platypush.plugins.dbus.DBusService[source]
<node>
<interface name=”org.platypush.Bus”>
<method name=”Post”>

<arg type=”s” name=”msg” direction=”in”/> <arg type=”s” name=”response” direction=”out”/>

</method>

</interface>

</node>

Post(msg: dict)[source]

This method accepts a message as a JSON object (either representing a valid request or an event) and either executes it (request) or forwards it to the application bus (event).

Parameters:

msg – Request or event, as a dictionary.

Returns:

The return value of the request, or 0 if the message is an event.

__init__()
class platypush.plugins.dbus.DbusPlugin(signals: Optional[Iterable[dict]] = None, service_name: Optional[str] = 'org.platypush.Bus', service_path: Optional[str] = '/', **kwargs)[source]

Plugin to interact with DBus.

This plugin can be used for the following tasks:

  • It can expose a D-Bus interface that other applications can use to push messages to Platypush (either action requests or events) serialized in JSON format. You can disable this listener by setting service_name to null in your configuration. If the D-Bus Platypush interface is enabled then you can push Platypush events and requests in JSON format from another application or script by specifying:

    • The D-Bus service (default: org.platypush.Bus)

    • The D-Bus interface (default: org.platypush.Bus)

    • The D-Bus path (default: /)

    • The D-Bus method (Post)

    • The Platypush JSON payload (first argument of the request). Format: {"type": "request", "action": "module.action", "args": {...}}

  • It can subscribe to multiple D-Bus signals, and it triggers a DbusSignalEvent when an event is received (signal filters should be specified in the signals configuration).

  • It can be used to query and inspect D-Bus objects through the query() method.

  • It can be used to execute methods exponsed by D-Bus objects through the execute() method.

Requires:

  • pydbus (pip install pydbus)

  • defusedxml (pip install defusedxml)

Triggers:

__init__(signals: Optional[Iterable[dict]] = None, service_name: Optional[str] = 'org.platypush.Bus', service_path: Optional[str] = '/', **kwargs)[source]
Parameters:
  • signals

    Specify this if you want to subscribe to specific DBus signals. Structure:

    [
      {
        "bus": "string",
        "interface": "The DBus interface that should be monitored (default: all)",
        "path": "Path of the resource to be monitored (default: all)",
        "sender": "Signal sender filter (default: all senders)",
        "signal": "Signal name filter (default: all signals)"
      }
    ]
    

    For example, to subscribe to all the messages on the session bus:

    dbus:
        signals:
            - bus: session
    

  • service_name – Name of the D-Bus service where Platypush will listen for new messages (requests and events). Set to null if you want to disable message execution over D-Bus for Platypush (default: org.platypush.Bus).

  • service_path – The path of the D-Bus message listener. Set to null if you want to disable message execution over D-Bus for Platypush (default: /).

execute(service: str, interface: str, method_name: str, bus: str = 'session', path: str = '/', args: Optional[list] = None)[source]

Execute a method exposed on DBus.

Parameters:
  • service – D-Bus service name.

  • interface – D-Bus nterface name.

  • method_name – Method name.

  • bus – Bus type. Supported: system and session (default: session).

  • path – Object path.

  • args – Arguments to be passed to the method, depending on the method signature.

Returns:

Return value of the executed method.

query(service: Optional[str] = None, bus=('system', 'session')) Dict[str, dict][source]

Query DBus for a specific service or for the full list of services.

Parameters:
  • service – Service name (default: None, query all services).

  • bus – Which bus(ses) should be queried (default: both system and session).

Returns:

A {service_name -> {properties}} mapping. Example:

"session": {
  "org.platypush.Bus": {
    "/": {
      "org.freedesktop.DBus.Properties": {
        "method": [
          {
            "name": "Get",
            "args": [
              {
                "type": "s",
                "name": "interface_name",
                "direction": "in"
              },
              {
                "type": "s",
                "name": "property_name",
                "direction": "in"
              },
              {
                "type": "v",
                "name": "value",
                "direction": "out"
              }
            ]
          },
          {
            "name": "GetAll",
            "args": [
              {
                "type": "s",
                "name": "interface_name",
                "direction": "in"
              },
              {
                "type": "a{sv}",
                "name": "properties",
                "direction": "out"
              }
            ]
          },
          {
            "name": "Set",
            "args": [
              {
                "type": "s",
                "name": "interface_name",
                "direction": "in"
              },
              {
                "type": "s",
                "name": "property_name",
                "direction": "in"
              },
              {
                "type": "v",
                "name": "value",
                "direction": "in"
              }
            ]
          }
        ],
        "signal": [
          {
            "name": "PropertiesChanged",
            "args": [
              {
                "type": "s",
                "name": "interface_name"
              },
              {
                "type": "a{sv}",
                "name": "changed_properties"
              },
              {
                "type": "as",
                "name": "invalidated_properties"
              }
            ]
          }
        ]
      },
      "org.freedesktop.DBus.Introspectable": {
        "method": [
          {
            "name": "Introspect",
            "args": [
              {
                "type": "s",
                "name": "xml_data",
                "direction": "out"
              }
            ]
          }
        ]
      },
      "org.freedesktop.DBus.Peer": {
        "method": [
          {
            "name": "Ping"
          },
          {
            "name": "GetMachineId",
            "args": [
              {
                "type": "s",
                "name": "machine_uuid",
                "direction": "out"
              }
            ]
          }
        ]
      },
      "org.platypush.Bus": {
        "method": [
          {
            "name": "Post",
            "args": [
              {
                "type": "s",
                "name": "msg",
                "direction": "in"
              },
              {
                "type": "s",
                "name": "response",
                "direction": "out"
              }
            ]
          }
        ]
      }
    }
  }
}