diff options
Diffstat (limited to 'synapse/events/presence_router.py')
| -rw-r--r-- | synapse/events/presence_router.py | 192 |
1 files changed, 156 insertions, 36 deletions
diff --git a/synapse/events/presence_router.py b/synapse/events/presence_router.py index 6c37c8a7a4..eb4556cdc1 100644 --- a/synapse/events/presence_router.py +++ b/synapse/events/presence_router.py @@ -11,45 +11,115 @@ # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. - -from typing import TYPE_CHECKING, Dict, Iterable, Set, Union +import logging +from typing import ( + TYPE_CHECKING, + Awaitable, + Callable, + Dict, + Iterable, + List, + Optional, + Set, + Union, +) from synapse.api.presence import UserPresenceState +from synapse.util.async_helpers import maybe_awaitable if TYPE_CHECKING: from synapse.server import HomeServer +GET_USERS_FOR_STATES_CALLBACK = Callable[ + [Iterable[UserPresenceState]], Awaitable[Dict[str, Set[UserPresenceState]]] +] +GET_INTERESTED_USERS_CALLBACK = Callable[ + [str], Awaitable[Union[Set[str], "PresenceRouter.ALL_USERS"]] +] + +logger = logging.getLogger(__name__) + + +def load_legacy_presence_router(hs: "HomeServer"): + """Wrapper that loads a presence router module configured using the old + configuration, and registers the hooks they implement. + """ + + if hs.config.presence_router_module_class is None: + return + + module = hs.config.presence_router_module_class + config = hs.config.presence_router_config + api = hs.get_module_api() + + presence_router = module(config=config, module_api=api) + + # The known hooks. If a module implements a method which name appears in this set, + # we'll want to register it. + presence_router_methods = { + "get_users_for_states", + "get_interested_users", + } + + # All methods that the module provides should be async, but this wasn't enforced + # in the old module system, so we wrap them if needed + def async_wrapper(f: Optional[Callable]) -> Optional[Callable[..., Awaitable]]: + # f might be None if the callback isn't implemented by the module. In this + # case we don't want to register a callback at all so we return None. + if f is None: + return None + + def run(*args, **kwargs): + # mypy doesn't do well across function boundaries so we need to tell it + # f is definitely not None. + assert f is not None + + return maybe_awaitable(f(*args, **kwargs)) + + return run + + # Register the hooks through the module API. + hooks = { + hook: async_wrapper(getattr(presence_router, hook, None)) + for hook in presence_router_methods + } + + api.register_presence_router_callbacks(**hooks) + class PresenceRouter: """ A module that the homeserver will call upon to help route user presence updates to - additional destinations. If a custom presence router is configured, calls will be - passed to that instead. + additional destinations. """ ALL_USERS = "ALL" def __init__(self, hs: "HomeServer"): - self.custom_presence_router = None + # Initially there are no callbacks + self._get_users_for_states_callbacks: List[GET_USERS_FOR_STATES_CALLBACK] = [] + self._get_interested_users_callbacks: List[GET_INTERESTED_USERS_CALLBACK] = [] - # Check whether a custom presence router module has been configured - if hs.config.presence_router_module_class: - # Initialise the module - self.custom_presence_router = hs.config.presence_router_module_class( - config=hs.config.presence_router_config, module_api=hs.get_module_api() + def register_presence_router_callbacks( + self, + get_users_for_states: Optional[GET_USERS_FOR_STATES_CALLBACK] = None, + get_interested_users: Optional[GET_INTERESTED_USERS_CALLBACK] = None, + ): + # PresenceRouter modules are required to implement both of these methods + # or neither of them as they are assumed to act in a complementary manner + paired_methods = [get_users_for_states, get_interested_users] + if paired_methods.count(None) == 1: + raise RuntimeError( + "PresenceRouter modules must register neither or both of the paired callbacks: " + "[get_users_for_states, get_interested_users]" ) - # Ensure the module has implemented the required methods - required_methods = ["get_users_for_states", "get_interested_users"] - for method_name in required_methods: - if not hasattr(self.custom_presence_router, method_name): - raise Exception( - "PresenceRouter module '%s' must implement all required methods: %s" - % ( - hs.config.presence_router_module_class.__name__, - ", ".join(required_methods), - ) - ) + # Append the methods provided to the lists of callbacks + if get_users_for_states is not None: + self._get_users_for_states_callbacks.append(get_users_for_states) + + if get_interested_users is not None: + self._get_interested_users_callbacks.append(get_interested_users) async def get_users_for_states( self, @@ -66,14 +136,40 @@ class PresenceRouter: A dictionary of user_id -> set of UserPresenceState, indicating which presence updates each user should receive. """ - if self.custom_presence_router is not None: - # Ask the custom module - return await self.custom_presence_router.get_users_for_states( - state_updates=state_updates - ) - # Don't include any extra destinations for presence updates - return {} + # Bail out early if we don't have any callbacks to run. + if len(self._get_users_for_states_callbacks) == 0: + # Don't include any extra destinations for presence updates + return {} + + users_for_states = {} + # run all the callbacks for get_users_for_states and combine the results + for callback in self._get_users_for_states_callbacks: + try: + result = await callback(state_updates) + except Exception as e: + logger.warning("Failed to run module API callback %s: %s", callback, e) + continue + + if not isinstance(result, Dict): + logger.warning( + "Wrong type returned by module API callback %s: %s, expected Dict", + callback, + result, + ) + continue + + for key, new_entries in result.items(): + if not isinstance(new_entries, Set): + logger.warning( + "Wrong type returned by module API callback %s: %s, expected Set", + callback, + new_entries, + ) + break + users_for_states.setdefault(key, set()).update(new_entries) + + return users_for_states async def get_interested_users(self, user_id: str) -> Union[Set[str], ALL_USERS]: """ @@ -92,12 +188,36 @@ class PresenceRouter: A set of user IDs to return presence updates for, or ALL_USERS to return all known updates. """ - if self.custom_presence_router is not None: - # Ask the custom module for interested users - return await self.custom_presence_router.get_interested_users( - user_id=user_id - ) - # A custom presence router is not defined. - # Don't report any additional interested users - return set() + # Bail out early if we don't have any callbacks to run. + if len(self._get_interested_users_callbacks) == 0: + # Don't report any additional interested users + return set() + + interested_users = set() + # run all the callbacks for get_interested_users and combine the results + for callback in self._get_interested_users_callbacks: + try: + result = await callback(user_id) + except Exception as e: + logger.warning("Failed to run module API callback %s: %s", callback, e) + continue + + # If one of the callbacks returns ALL_USERS then we can stop calling all + # of the other callbacks, since the set of interested_users is already as + # large as it can possibly be + if result == PresenceRouter.ALL_USERS: + return PresenceRouter.ALL_USERS + + if not isinstance(result, Set): + logger.warning( + "Wrong type returned by module API callback %s: %s, expected set", + callback, + result, + ) + continue + + # Add the new interested users to the set + interested_users.update(result) + + return interested_users |