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<h1 id="presence-router-callbacks"><a class="header" href="#presence-router-callbacks">Presence router callbacks</a></h1>
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<p>Presence router callbacks allow module developers to specify additional users (local or remote)
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to receive certain presence updates from local users. Presence router callbacks can be
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registered using the module API's <code>register_presence_router_callbacks</code> method.</p>
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<h2 id="callbacks"><a class="header" href="#callbacks">Callbacks</a></h2>
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<p>The available presence router callbacks are:</p>
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<h3 id="get_users_for_states"><a class="header" href="#get_users_for_states"><code>get_users_for_states</code></a></h3>
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<p><em>First introduced in Synapse v1.42.0</em></p>
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<pre><code class="language-python">async def get_users_for_states(
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state_updates: Iterable["synapse.api.UserPresenceState"],
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) -> Dict[str, Set["synapse.api.UserPresenceState"]]
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</code></pre>
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<p><strong>Requires</strong> <code>get_interested_users</code> to also be registered</p>
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<p>Called when processing updates to the presence state of one or more users. This callback can
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be used to instruct the server to forward that presence state to specific users. The module
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must return a dictionary that maps from Matrix user IDs (which can be local or remote) to the
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<code>UserPresenceState</code> changes that they should be forwarded.</p>
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<p>Synapse will then attempt to send the specified presence updates to each user when possible.</p>
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<p>If multiple modules implement this callback, Synapse merges all the dictionaries returned
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by the callbacks. If multiple callbacks return a dictionary containing the same key,
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Synapse concatenates the sets associated with this key from each dictionary. </p>
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<h3 id="get_interested_users"><a class="header" href="#get_interested_users"><code>get_interested_users</code></a></h3>
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<p><em>First introduced in Synapse v1.42.0</em></p>
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<pre><code class="language-python">async def get_interested_users(
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user_id: str
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) -> Union[Set[str], "synapse.module_api.PRESENCE_ALL_USERS"]
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</code></pre>
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<p><strong>Requires</strong> <code>get_users_for_states</code> to also be registered</p>
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<p>Called when determining which users someone should be able to see the presence state of. This
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callback should return complementary results to <code>get_users_for_state</code> or the presence information
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may not be properly forwarded.</p>
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<p>The callback is given the Matrix user ID for a local user that is requesting presence data and
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should return the Matrix user IDs of the users whose presence state they are allowed to
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query. The returned users can be local or remote. </p>
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<p>Alternatively the callback can return <code>synapse.module_api.PRESENCE_ALL_USERS</code>
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to indicate that the user should receive updates from all known users.</p>
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<p>If multiple modules implement this callback, they will be considered in order. Synapse
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calls each callback one by one, and use a concatenation of all the <code>set</code>s returned by the
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callbacks. If one callback returns <code>synapse.module_api.PRESENCE_ALL_USERS</code>, Synapse uses
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this value instead. If this happens, Synapse does not call any of the subsequent
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implementations of this callback.</p>
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<h2 id="example"><a class="header" href="#example">Example</a></h2>
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<p>The example below is a module that implements both presence router callbacks, and ensures
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that <code>@alice:example.org</code> receives all presence updates from <code>@bob:example.com</code> and
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<code>@charlie:somewhere.org</code>, regardless of whether Alice shares a room with any of them.</p>
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<pre><code class="language-python">from typing import Dict, Iterable, Set, Union
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from synapse.module_api import ModuleApi
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class CustomPresenceRouter:
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def __init__(self, config: dict, api: ModuleApi):
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self.api = api
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self.api.register_presence_router_callbacks(
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get_users_for_states=self.get_users_for_states,
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get_interested_users=self.get_interested_users,
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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["synapse.api.UserPresenceState"],
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) -> Dict[str, Set["synapse.api.UserPresenceState"]]:
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res = {}
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for update in state_updates:
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if (
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update.user_id == "@bob:example.com"
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or update.user_id == "@charlie:somewhere.org"
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):
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res.setdefault("@alice:example.com", set()).add(update)
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return res
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async def get_interested_users(
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self,
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user_id: str,
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) -> Union[Set[str], "synapse.module_api.PRESENCE_ALL_USERS"]:
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if user_id == "@alice:example.com":
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return {"@bob:example.com", "@charlie:somewhere.org"}
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return set()
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</code></pre>
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