dbus-fast/tests/service/test_methods.py

import pytest
from dbus_next import (
    DBusError,
    ErrorType,
    Message,
    MessageFlag,
    MessageType,
    SignatureTree,
    Variant,
)
from dbus_next.aio import MessageBus
from dbus_next.service import ServiceInterface, method


class ExampleInterface(ServiceInterface):
    def __init__(self, name):
        super().__init__(name)

    @method()
    def echo(self, what: "s") -> "s":
        assert type(self) is ExampleInterface
        return what

    @method()
    def echo_multiple(self, what1: "s", what2: "s") -> "ss":
        assert type(self) is ExampleInterface
        return [what1, what2]

    @method()
    def echo_containers(
        self, array: "as", variant: "v", dict_entries: "a{sv}", struct: "(s(s(v)))"
    ) -> "asva{sv}(s(s(v)))":
        assert type(self) is ExampleInterface
        return [array, variant, dict_entries, struct]

    @method()
    def ping(self):
        assert type(self) is ExampleInterface
        pass

    @method(name="renamed")
    def original_name(self):
        assert type(self) is ExampleInterface
        pass

    @method(disabled=True)
    def not_here(self):
        assert type(self) is ExampleInterface
        pass

    @method()
    def throws_unexpected_error(self):
        assert type(self) is ExampleInterface
        raise Exception("oops")

    @method()
    def throws_dbus_error(self):
        assert type(self) is ExampleInterface
        raise DBusError("test.error", "an error ocurred")


class AsyncInterface(ServiceInterface):
    def __init__(self, name):
        super().__init__(name)

    @method()
    async def echo(self, what: "s") -> "s":
        assert type(self) is AsyncInterface
        return what

    @method()
    async def echo_multiple(self, what1: "s", what2: "s") -> "ss":
        assert type(self) is AsyncInterface
        return [what1, what2]

    @method()
    async def echo_containers(
        self, array: "as", variant: "v", dict_entries: "a{sv}", struct: "(s(s(v)))"
    ) -> "asva{sv}(s(s(v)))":
        assert type(self) is AsyncInterface
        return [array, variant, dict_entries, struct]

    @method()
    async def ping(self):
        assert type(self) is AsyncInterface
        pass

    @method(name="renamed")
    async def original_name(self):
        assert type(self) is AsyncInterface
        pass

    @method(disabled=True)
    async def not_here(self):
        assert type(self) is AsyncInterface
        pass

    @method()
    async def throws_unexpected_error(self):
        assert type(self) is AsyncInterface
        raise Exception("oops")

    @method()
    def throws_dbus_error(self):
        assert type(self) is AsyncInterface
        raise DBusError("test.error", "an error ocurred")


@pytest.mark.parametrize("interface_class", [ExampleInterface, AsyncInterface])
@pytest.mark.asyncio
async def test_methods(interface_class):
    bus1 = await MessageBus().connect()
    bus2 = await MessageBus().connect()

    interface = interface_class("test.interface")
    export_path = "/test/path"

    async def call(member, signature="", body=[], flags=MessageFlag.NONE):
        return await bus2.call(
            Message(
                destination=bus1.unique_name,
                path=export_path,
                interface=interface.name,
                member=member,
                signature=signature,
                body=body,
                flags=flags,
            )
        )

    bus1.export(export_path, interface)

    body = ["hello world"]
    reply = await call("echo", "s", body)

    assert reply.message_type == MessageType.METHOD_RETURN, reply.body[0]
    assert reply.signature == "s"
    assert reply.body == body

    body = ["hello", "world"]
    reply = await call("echo_multiple", "ss", body)
    assert reply.message_type == MessageType.METHOD_RETURN, reply.body[0]
    assert reply.signature == "ss"
    assert reply.body == body

    body = [
        ["hello", "world"],
        Variant("v", Variant("(ss)", ["hello", "world"])),
        {"foo": Variant("t", 100)},
        ["one", ["two", [Variant("s", "three")]]],
    ]
    signature = "asva{sv}(s(s(v)))"
    SignatureTree(signature).verify(body)
    reply = await call("echo_containers", signature, body)
    assert reply.message_type == MessageType.METHOD_RETURN, reply.body[0]
    assert reply.signature == signature
    assert reply.body == body

    reply = await call("ping")
    assert reply.message_type == MessageType.METHOD_RETURN, reply.body[0]
    assert reply.signature == ""
    assert reply.body == []

    reply = await call("throws_unexpected_error")
    assert reply.message_type == MessageType.ERROR, reply.body[0]
    assert reply.error_name == ErrorType.SERVICE_ERROR.value, reply.body[0]

    reply = await call("throws_dbus_error")
    assert reply.message_type == MessageType.ERROR, reply.body[0]
    assert reply.error_name == "test.error", reply.body[0]
    assert reply.body == ["an error ocurred"]

    reply = await call("ping", flags=MessageFlag.NO_REPLY_EXPECTED)
    assert reply is None

    reply = await call("throws_unexpected_error", flags=MessageFlag.NO_REPLY_EXPECTED)
    assert reply is None

    reply = await call("throws_dbus_error", flags=MessageFlag.NO_REPLY_EXPECTED)
    assert reply is None