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|                         <h1 id="presence-router-module"><a class="header" href="#presence-router-module">Presence Router Module</a></h1>
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| <p>Synapse supports configuring a module that can specify additional users
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| (local or remote) to should receive certain presence updates from local
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| users.</p>
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| <p>Note that routing presence via Application Service transactions is not
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| currently supported.</p>
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| <p>The presence routing module is implemented as a Python class, which will
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| be imported by the running Synapse.</p>
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| <h2 id="python-presence-router-class"><a class="header" href="#python-presence-router-class">Python Presence Router Class</a></h2>
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| <p>The Python class is instantiated with two objects:</p>
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| <ul>
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| <li>A configuration object of some type (see below).</li>
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| <li>An instance of <code>synapse.module_api.ModuleApi</code>.</li>
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| </ul>
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| <p>It then implements methods related to presence routing.</p>
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| <p>Note that one method of <code>ModuleApi</code> that may be useful is:</p>
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| <pre><code class="language-python">async def ModuleApi.send_local_online_presence_to(users: Iterable[str]) -> None
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| </code></pre>
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| <p>which can be given a list of local or remote MXIDs to broadcast known, online user
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| presence to (for those users that the receiving user is considered interested in). 
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| It does not include state for users who are currently offline, and it can only be
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| called on workers that support sending federation. Additionally, this method must
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| only be called from the process that has been configured to write to the
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| the <a href="workers.html#stream-writers">presence stream</a>.
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| By default, this is the main process, but another worker can be configured to do
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| so.</p>
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| <h3 id="module-structure"><a class="header" href="#module-structure">Module structure</a></h3>
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| <p>Below is a list of possible methods that can be implemented, and whether they are
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| required.</p>
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| <h4 id="parse_config"><a class="header" href="#parse_config"><code>parse_config</code></a></h4>
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| <pre><code class="language-python">def parse_config(config_dict: dict) -> Any
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| </code></pre>
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| <p><strong>Required.</strong> A static method that is passed a dictionary of config options, and
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| should return a validated config object. This method is described further in
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| <a href="#configuration">Configuration</a>.</p>
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| <h4 id="get_users_for_states"><a class="header" href="#get_users_for_states"><code>get_users_for_states</code></a></h4>
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| <pre><code class="language-python">async def get_users_for_states(
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|     self,
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|     state_updates: Iterable[UserPresenceState],
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| ) -> Dict[str, Set[UserPresenceState]]:
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| </code></pre>
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| <p><strong>Required.</strong> An asynchronous method that is passed an iterable of user presence
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| state. This method can determine whether a given presence update should be sent to certain
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| users. It does this by returning a dictionary with keys representing local or remote
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| Matrix User IDs, and values being a python set
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| of <code>synapse.handlers.presence.UserPresenceState</code> instances.</p>
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| <p>Synapse will then attempt to send the specified presence updates to each user when
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| possible.</p>
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| <h4 id="get_interested_users"><a class="header" href="#get_interested_users"><code>get_interested_users</code></a></h4>
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| <pre><code class="language-python">async def get_interested_users(self, user_id: str) -> Union[Set[str], str]
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| </code></pre>
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| <p><strong>Required.</strong> An asynchronous method that is passed a single Matrix User ID. This
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| method is expected to return the users that the passed in user may be interested in the
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| presence of. Returned users may be local or remote. The presence routed as a result of
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| what this method returns is sent in addition to the updates already sent between users
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| that share a room together. Presence updates are deduplicated.</p>
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| <p>This method should return a python set of Matrix User IDs, or the object
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| <code>synapse.events.presence_router.PresenceRouter.ALL_USERS</code> to indicate that the passed
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| user should receive presence information for <em>all</em> known users.</p>
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| <p>For clarity, if the user <code>@alice:example.org</code> is passed to this method, and the Set
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| <code>{"@bob:example.com", "@charlie:somewhere.org"}</code> is returned, this signifies that Alice
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| should receive presence updates sent by Bob and Charlie, regardless of whether these
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| users share a room.</p>
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| <h3 id="example"><a class="header" href="#example">Example</a></h3>
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| <p>Below is an example implementation of a presence router class.</p>
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| <pre><code class="language-python">from typing import Dict, Iterable, Set, Union
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| from synapse.events.presence_router import PresenceRouter
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| from synapse.handlers.presence import UserPresenceState
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| from synapse.module_api import ModuleApi
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| 
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| class PresenceRouterConfig:
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|     def __init__(self):
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|         # Config options with their defaults
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|         # A list of users to always send all user presence updates to
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|         self.always_send_to_users = []  # type: List[str]
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|         
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|         # A list of users to ignore presence updates for. Does not affect
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|         # shared-room presence relationships
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|         self.blacklisted_users = []  # type: List[str]
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| 
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| class ExamplePresenceRouter:
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|     """An example implementation of synapse.presence_router.PresenceRouter.
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|     Supports routing all presence to a configured set of users, or a subset
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|     of presence from certain users to members of certain rooms.
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| 
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|     Args:
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|         config: A configuration object.
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|         module_api: An instance of Synapse's ModuleApi.
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|     """
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|     def __init__(self, config: PresenceRouterConfig, module_api: ModuleApi):
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|         self._config = config
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|         self._module_api = module_api
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| 
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|     @staticmethod
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|     def parse_config(config_dict: dict) -> PresenceRouterConfig:
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|         """Parse a configuration dictionary from the homeserver config, do
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|         some validation and return a typed PresenceRouterConfig.
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| 
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|         Args:
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|             config_dict: The configuration dictionary.
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| 
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|         Returns:
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|             A validated config object.
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|         """
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|         # Initialise a typed config object
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|         config = PresenceRouterConfig()
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|         always_send_to_users = config_dict.get("always_send_to_users")
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|         blacklisted_users = config_dict.get("blacklisted_users")
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| 
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|         # Do some validation of config options... otherwise raise a
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|         # synapse.config.ConfigError.
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|         config.always_send_to_users = always_send_to_users
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|         config.blacklisted_users = blacklisted_users
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| 
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|         return config
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| 
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|     async def get_users_for_states(
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|         self,
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|         state_updates: Iterable[UserPresenceState],
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|     ) -> Dict[str, Set[UserPresenceState]]:
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|         """Given an iterable of user presence updates, determine where each one
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|         needs to go. Returned results will not affect presence updates that are
 | |
|         sent between users who share a room.
 | |
| 
 | |
|         Args:
 | |
|             state_updates: An iterable of user presence state updates.
 | |
| 
 | |
|         Returns:
 | |
|           A dictionary of user_id -> set of UserPresenceState that the user should 
 | |
|           receive.
 | |
|         """
 | |
|         destination_users = {}  # type: Dict[str, Set[UserPresenceState]
 | |
| 
 | |
|         # Ignore any updates for blacklisted users
 | |
|         desired_updates = set()
 | |
|         for update in state_updates:
 | |
|             if update.state_key not in self._config.blacklisted_users:
 | |
|                 desired_updates.add(update)
 | |
| 
 | |
|         # Send all presence updates to specific users
 | |
|         for user_id in self._config.always_send_to_users:
 | |
|             destination_users[user_id] = desired_updates
 | |
| 
 | |
|         return destination_users
 | |
| 
 | |
|     async def get_interested_users(
 | |
|         self,
 | |
|         user_id: str,
 | |
|     ) -> Union[Set[str], PresenceRouter.ALL_USERS]:
 | |
|         """
 | |
|         Retrieve a list of users that `user_id` is interested in receiving the
 | |
|         presence of. This will be in addition to those they share a room with.
 | |
|         Optionally, the object PresenceRouter.ALL_USERS can be returned to indicate
 | |
|         that this user should receive all incoming local and remote presence updates.
 | |
| 
 | |
|         Note that this method will only be called for local users.
 | |
| 
 | |
|         Args:
 | |
|           user_id: A user requesting presence updates.
 | |
| 
 | |
|         Returns:
 | |
|           A set of user IDs to return additional presence updates for, or
 | |
|           PresenceRouter.ALL_USERS to return presence updates for all other users.
 | |
|         """
 | |
|         if user_id in self._config.always_send_to_users:
 | |
|             return PresenceRouter.ALL_USERS
 | |
| 
 | |
|         return set()
 | |
| </code></pre>
 | |
| <h4 id="a-note-on-get_users_for_states-and-get_interested_users"><a class="header" href="#a-note-on-get_users_for_states-and-get_interested_users">A note on <code>get_users_for_states</code> and <code>get_interested_users</code></a></h4>
 | |
| <p>Both of these methods are effectively two different sides of the same coin. The logic
 | |
| regarding which users should receive updates for other users should be the same 
 | |
| between them.</p>
 | |
| <p><code>get_users_for_states</code> is called when presence updates come in from either federation 
 | |
| or local users, and is used to either direct local presence to remote users, or to
 | |
| wake up the sync streams of local users to collect remote presence.</p>
 | |
| <p>In contrast, <code>get_interested_users</code> is used to determine the users that presence should
 | |
| be fetched for when a local user is syncing. This presence is then retrieved, before
 | |
| being fed through <code>get_users_for_states</code> once again, with only the syncing user's
 | |
| routing information pulled from the resulting dictionary.</p>
 | |
| <p>Their routing logic should thus line up, else you may run into unintended behaviour.</p>
 | |
| <h2 id="configuration"><a class="header" href="#configuration">Configuration</a></h2>
 | |
| <p>Once you've crafted your module and installed it into the same Python environment as
 | |
| Synapse, amend your homeserver config file with the following.</p>
 | |
| <pre><code class="language-yaml">presence:
 | |
|   enabled: true
 | |
| 
 | |
|   presence_router:
 | |
|     module: my_module.ExamplePresenceRouter
 | |
|     config:
 | |
|       # Any configuration options for your module. The below is an example.
 | |
|       # of setting options for ExamplePresenceRouter.
 | |
|       always_send_to_users: ["@presence_gobbler:example.org"]
 | |
|       blacklisted_users:
 | |
|         - "@alice:example.com"
 | |
|         - "@bob:example.com"
 | |
|       ...
 | |
| </code></pre>
 | |
| <p>The contents of <code>config</code> will be passed as a Python dictionary to the static
 | |
| <code>parse_config</code> method of your class. The object returned by this method will
 | |
| then be passed to the <code>__init__</code> method of your module as <code>config</code>.</p>
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