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| author | richvdh <richvdh@users.noreply.github.com> | 2021-07-07 10:08:50 +0000 |
|---|---|---|
| committer | richvdh <richvdh@users.noreply.github.com> | 2021-07-07 10:08:50 +0000 |
| commit | 44b8bf9404c10c88f55210861f646bd00af379f0 (patch) | |
| tree | 718b9671b1b25a69227ed19b30994379785d9c5f /v1.38/presence_router_module.html | |
| parent | index for latest (diff) | |
| download | synapse-44b8bf9404c10c88f55210861f646bd00af379f0.tar.xz | |
deploy: 26196df575501e299ed7bd34271f8677705bd81c
Diffstat (limited to 'v1.38/presence_router_module.html')
| -rw-r--r-- | v1.38/presence_router_module.html | 456 |
1 files changed, 456 insertions, 0 deletions
diff --git a/v1.38/presence_router_module.html b/v1.38/presence_router_module.html new file mode 100644 index 0000000000..9083bfc017 --- /dev/null +++ b/v1.38/presence_router_module.html @@ -0,0 +1,456 @@ +<!DOCTYPE HTML> +<html lang="en" class="sidebar-visible no-js light"> + <head> + <!-- Book generated using mdBook --> + <meta charset="UTF-8"> + <title>Presence Router - Synapse</title> + + + + + <!-- Custom HTML head --> + + + + <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> + <meta name="description" content=""> + <meta name="viewport" content="width=device-width, initial-scale=1"> + <meta name="theme-color" content="#ffffff" /> + + + <link rel="icon" href="favicon.svg"> + + + <link rel="shortcut icon" href="favicon.png"> + + <link rel="stylesheet" href="css/variables.css"> + <link rel="stylesheet" href="css/general.css"> + <link rel="stylesheet" href="css/chrome.css"> + + <link rel="stylesheet" href="css/print.css" media="print"> + + + <!-- Fonts --> + <link rel="stylesheet" href="FontAwesome/css/font-awesome.css"> + + <link rel="stylesheet" href="fonts/fonts.css"> + + + <!-- Highlight.js Stylesheets --> + <link rel="stylesheet" href="highlight.css"> + <link rel="stylesheet" href="tomorrow-night.css"> + <link rel="stylesheet" href="ayu-highlight.css"> + + <!-- Custom theme stylesheets --> + + <link rel="stylesheet" href="docs/website_files/table-of-contents.css"> + + <link rel="stylesheet" href="docs/website_files/remove-nav-buttons.css"> + + <link rel="stylesheet" href="docs/website_files/indent-section-headers.css"> + + + + </head> + <body> + <!-- Provide site root to javascript --> + <script type="text/javascript"> + var path_to_root = ""; + var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? 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(Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar"> + <i class="fa fa-search"></i> + </button> + + </div> + + <h1 class="menu-title">Synapse</h1> + + <div class="right-buttons"> + + <a href="print.html" title="Print this book" aria-label="Print this book"> + <i id="print-button" class="fa fa-print"></i> + </a> + + + <a href="https://github.com/matrix-org/synapse" title="Git repository" aria-label="Git repository"> + <i id="git-repository-button" class="fa fa-github"></i> + </a> + + + <a href="https://github.com/matrix-org/synapse/edit/develop/docs/presence_router_module.md" title="Suggest an edit" aria-label="Suggest an edit"> + <i id="git-edit-button" class="fa fa-edit"></i> + </a> + + + </div> + </div> + + + <div id="search-wrapper" class="hidden"> + <form id="searchbar-outer" class="searchbar-outer"> + <input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header"> + </form> + <div id="searchresults-outer" class="searchresults-outer hidden"> + <div id="searchresults-header" class="searchresults-header"></div> + <ul id="searchresults"> + </ul> + </div> + </div> + + + <!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM --> + <script type="text/javascript"> + document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible'); + document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible'); + Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) { + link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1); + }); + </script> + + <div id="content" class="content"> + <main> + <!-- Page table of contents --> + <div class="sidetoc"> + <nav class="pagetoc"></nav> + </div> + + <h1 id="presence-router-module"><a class="header" href="#presence-router-module">Presence Router Module</a></h1> +<p>Synapse supports configuring a module that can specify additional users +(local or remote) to should receive certain presence updates from local +users.</p> +<p>Note that routing presence via Application Service transactions is not +currently supported.</p> +<p>The presence routing module is implemented as a Python class, which will +be imported by the running Synapse.</p> +<h2 id="python-presence-router-class"><a class="header" href="#python-presence-router-class">Python Presence Router Class</a></h2> +<p>The Python class is instantiated with two objects:</p> +<ul> +<li>A configuration object of some type (see below).</li> +<li>An instance of <code>synapse.module_api.ModuleApi</code>.</li> +</ul> +<p>It then implements methods related to presence routing.</p> +<p>Note that one method of <code>ModuleApi</code> that may be useful is:</p> +<pre><code class="language-python">async def ModuleApi.send_local_online_presence_to(users: Iterable[str]) -> None +</code></pre> +<p>which can be given a list of local or remote MXIDs to broadcast known, online user +presence to (for those users that the receiving user is considered interested in). +It does not include state for users who are currently offline, and it can only be +called on workers that support sending federation. Additionally, this method must +only be called from the process that has been configured to write to the +the <a href="workers.html#stream-writers">presence stream</a>. +By default, this is the main process, but another worker can be configured to do +so.</p> +<h3 id="module-structure"><a class="header" href="#module-structure">Module structure</a></h3> +<p>Below is a list of possible methods that can be implemented, and whether they are +required.</p> +<h4 id="parse_config"><a class="header" href="#parse_config"><code>parse_config</code></a></h4> +<pre><code class="language-python">def parse_config(config_dict: dict) -> Any +</code></pre> +<p><strong>Required.</strong> A static method that is passed a dictionary of config options, and +should return a validated config object. This method is described further in +<a href="#configuration">Configuration</a>.</p> +<h4 id="get_users_for_states"><a class="header" href="#get_users_for_states"><code>get_users_for_states</code></a></h4> +<pre><code class="language-python">async def get_users_for_states( + self, + state_updates: Iterable[UserPresenceState], +) -> Dict[str, Set[UserPresenceState]]: +</code></pre> +<p><strong>Required.</strong> An asynchronous method that is passed an iterable of user presence +state. This method can determine whether a given presence update should be sent to certain +users. It does this by returning a dictionary with keys representing local or remote +Matrix User IDs, and values being a python set +of <code>synapse.handlers.presence.UserPresenceState</code> instances.</p> +<p>Synapse will then attempt to send the specified presence updates to each user when +possible.</p> +<h4 id="get_interested_users"><a class="header" href="#get_interested_users"><code>get_interested_users</code></a></h4> +<pre><code class="language-python">async def get_interested_users(self, user_id: str) -> Union[Set[str], str] +</code></pre> +<p><strong>Required.</strong> An asynchronous method that is passed a single Matrix User ID. This +method is expected to return the users that the passed in user may be interested in the +presence of. Returned users may be local or remote. The presence routed as a result of +what this method returns is sent in addition to the updates already sent between users +that share a room together. Presence updates are deduplicated.</p> +<p>This method should return a python set of Matrix User IDs, or the object +<code>synapse.events.presence_router.PresenceRouter.ALL_USERS</code> to indicate that the passed +user should receive presence information for <em>all</em> known users.</p> +<p>For clarity, if the user <code>@alice:example.org</code> is passed to this method, and the Set +<code>{"@bob:example.com", "@charlie:somewhere.org"}</code> is returned, this signifies that Alice +should receive presence updates sent by Bob and Charlie, regardless of whether these +users share a room.</p> +<h3 id="example"><a class="header" href="#example">Example</a></h3> +<p>Below is an example implementation of a presence router class.</p> +<pre><code class="language-python">from typing import Dict, Iterable, Set, Union +from synapse.events.presence_router import PresenceRouter +from synapse.handlers.presence import UserPresenceState +from synapse.module_api import ModuleApi + +class PresenceRouterConfig: + def __init__(self): + # Config options with their defaults + # A list of users to always send all user presence updates to + self.always_send_to_users = [] # type: List[str] + + # A list of users to ignore presence updates for. Does not affect + # shared-room presence relationships + self.blacklisted_users = [] # type: List[str] + +class ExamplePresenceRouter: + """An example implementation of synapse.presence_router.PresenceRouter. + Supports routing all presence to a configured set of users, or a subset + of presence from certain users to members of certain rooms. + + Args: + config: A configuration object. + module_api: An instance of Synapse's ModuleApi. + """ + def __init__(self, config: PresenceRouterConfig, module_api: ModuleApi): + self._config = config + self._module_api = module_api + + @staticmethod + def parse_config(config_dict: dict) -> PresenceRouterConfig: + """Parse a configuration dictionary from the homeserver config, do + some validation and return a typed PresenceRouterConfig. + + Args: + config_dict: The configuration dictionary. + + Returns: + A validated config object. + """ + # Initialise a typed config object + config = PresenceRouterConfig() + always_send_to_users = config_dict.get("always_send_to_users") + blacklisted_users = config_dict.get("blacklisted_users") + + # Do some validation of config options... otherwise raise a + # synapse.config.ConfigError. + config.always_send_to_users = always_send_to_users + config.blacklisted_users = blacklisted_users + + return config + + async def get_users_for_states( + self, + state_updates: Iterable[UserPresenceState], + ) -> Dict[str, Set[UserPresenceState]]: + """Given an iterable of user presence updates, determine where each one + 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> + + </main> + + <nav class="nav-wrapper" aria-label="Page navigation"> + <!-- Mobile navigation buttons --> + + <a rel="prev" href="spam_checker.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> + <i class="fa fa-angle-left"></i> + </a> + + + + <a rel="next" href="workers.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> + <i class="fa fa-angle-right"></i> + </a> + + + <div style="clear: both"></div> + </nav> + </div> + </div> + + <nav class="nav-wide-wrapper" aria-label="Page navigation"> + + <a rel="prev" href="spam_checker.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> + <i class="fa fa-angle-left"></i> + </a> + + + + <a rel="next" href="workers.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> + <i class="fa fa-angle-right"></i> + </a> + + </nav> + + </div> + + + + + + + + + <script type="text/javascript"> + window.playground_copyable = true; + </script> + + + + + + <script src="elasticlunr.min.js" type="text/javascript" charset="utf-8"></script> + <script src="mark.min.js" type="text/javascript" charset="utf-8"></script> + <script src="searcher.js" type="text/javascript" charset="utf-8"></script> + + + <script src="clipboard.min.js" type="text/javascript" charset="utf-8"></script> + <script src="highlight.js" type="text/javascript" charset="utf-8"></script> + <script src="book.js" type="text/javascript" charset="utf-8"></script> + + <!-- Custom JS scripts --> + + <script type="text/javascript" src="docs/website_files/table-of-contents.js"></script> + + + + + </body> +</html> \ No newline at end of file |