Updated IPv8 while keeping Community kwargs

[qstokkink]

This PR is the second attempt to update the IPv8 version to 2.12 in Tribler.

The previous PR to update the version, #7620, was rejected because communities could not __init__ with kwargs. In this PR, I introduce adapters to allow communities to __init__ with args and kwargs, like in the previous IPv8 version (2.11).

• The new class TriblerMockIPv8 provides the old interface using the new MockIPv8.
• The new class TriblerTestBase provides the old interface using the new TestBase.
• An update to TriblerCommunity provides the old interface using the new Community.

Disclaimer: I still prefer the implementation of #7620 over this.

[kozlovsky]

Looks good

[kozlovsky]

I was wondering if it is possible to have a type-safe equivalent of args_kwargs_to_community_settings that specifies the types of its arguments, and came up with the following:

community_class = TypeVar('community_class', bound=Community)

_missed = object()


def create_settings(cls: Type[community_class],
                    my_peer: Peer = _missed,
                    endpoint: Endpoint = _missed,
                    network: Network = _missed,
                    max_peers: int = _missed,
                    anonymize: bool = _missed,
                    **kwargs
                    ) -> community_class.settings_class:
    params = dict(my_peer=my_peer, endpoint=endpoint, network=network,
                  max_peers=max_peers, anonymize=anonymize)
    params.update(kwargs)
    params = {key: value for key, value in params.items() if value is not _missed}
    return cls.settings_class(**params)


def create_community(cls: Type[community_class],
                     my_peer: Peer = _missed,
                     endpoint: Endpoint = _missed,
                     network: Network = _missed,
                     max_peers: int = _missed,
                     anonymize: bool = _missed,
                     **kwargs
                     ) -> community_class:
    return cls(create_settings(cls, my_peer, endpoint, network, max_peers, anonymize, **kwargs))

With this, instead of

community = DiscoveryCommunity(args_kwargs_to_community_settings(DiscoveryCommunity.settings_class,
                                                                 [self.peer, ipv8.endpoint, ipv8.network],
                                                                 {"max_peers": 100}))

It is possible to write

community = create_community(DiscoveryCommunity, self.peer, ipv8.endpoint, ipv8.network, max_peers=100)

and argument types will be correctly checked.

But as args_kwargs_to_community_settings is used in only a few places, I'm not advocating for a type-safe version; the current PR version looks good enough to me

[qstokkink]

@kozlovsky That seems like a nice improvement. Would you be O.K. with opening a PR for your proposal after this PR has been merged?

[kozlovsky]

@qstokkink Sure!

[qstokkink]

@kozlovsky thanks! I'll merge this PR in its current state then.