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| author | H-Shay <H-Shay@users.noreply.github.com> | 2023-08-23 16:35:44 +0000 |
|---|---|---|
| committer | H-Shay <H-Shay@users.noreply.github.com> | 2023-08-23 16:35:44 +0000 |
| commit | 99346139466f0353664c613efdf2d6fe329cfca2 (patch) | |
| tree | 27ff925c07f0f982b544ea91697d474e52954eab /v1.91/modules/writing_a_module.html | |
| parent | deploy: 18279631e9555bd9032b993074e62c7af886d9cd (diff) | |
| download | synapse-99346139466f0353664c613efdf2d6fe329cfca2.tar.xz | |
deploy: 7064b4bcf311c45855c0f9d11a9db8a963b252b9
Diffstat (limited to 'v1.91/modules/writing_a_module.html')
| -rw-r--r-- | v1.91/modules/writing_a_module.html | 298 |
1 files changed, 298 insertions, 0 deletions
diff --git a/v1.91/modules/writing_a_module.html b/v1.91/modules/writing_a_module.html new file mode 100644 index 0000000000..8a64cb764f --- /dev/null +++ b/v1.91/modules/writing_a_module.html @@ -0,0 +1,298 @@ +<!DOCTYPE HTML> +<html lang="en" class="sidebar-visible no-js light"> + <head> + <!-- Book generated using mdBook --> + <meta charset="UTF-8"> + <title>Writing a module - 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/modules/writing_a_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="writing-a-module"><a class="header" href="#writing-a-module">Writing a module</a></h1> +<p>A module is a Python class that uses Synapse's module API to interact with the +homeserver. It can register callbacks that Synapse will call on specific operations, as +well as web resources to attach to Synapse's web server.</p> +<p>When instantiated, a module is given its parsed configuration as well as an instance of +the <code>synapse.module_api.ModuleApi</code> class. The configuration is a dictionary, and is +either the output of the module's <code>parse_config</code> static method (see below), or the +configuration associated with the module in Synapse's configuration file.</p> +<p>See the documentation for the <code>ModuleApi</code> class +<a href="https://github.com/matrix-org/synapse/blob/master/synapse/module_api/__init__.py">here</a>.</p> +<h2 id="when-synapse-runs-with-several-modules-configured"><a class="header" href="#when-synapse-runs-with-several-modules-configured">When Synapse runs with several modules configured</a></h2> +<p>If Synapse is running with other modules configured, the order each module appears in +within the <code>modules</code> section of the Synapse configuration file might restrict what it can +or cannot register. See <a href="index.html#using-multiple-modules">this section</a> for more +information.</p> +<p>On top of the rules listed in the link above, if a callback returns a value that should +cause the current operation to fail (e.g. if a callback checking an event returns with a +value that should cause the event to be denied), Synapse will fail the operation and +ignore any subsequent callbacks that should have been run after this one.</p> +<p>The documentation for each callback mentions how Synapse behaves when +multiple modules implement it.</p> +<h2 id="handling-the-modules-configuration"><a class="header" href="#handling-the-modules-configuration">Handling the module's configuration</a></h2> +<p>A module can implement the following static method:</p> +<pre><code class="language-python">@staticmethod +def parse_config(config: dict) -> Any +</code></pre> +<p>This method is given a dictionary resulting from parsing the YAML configuration for the +module. It may modify it (for example by parsing durations expressed as strings (e.g. +"5d") into milliseconds, etc.), and return the modified dictionary. It may also verify +that the configuration is correct, and raise an instance of +<code>synapse.module_api.errors.ConfigError</code> if not.</p> +<h2 id="registering-a-web-resource"><a class="header" href="#registering-a-web-resource">Registering a web resource</a></h2> +<p>Modules can register web resources onto Synapse's web server using the following module +API method:</p> +<pre><code class="language-python">def ModuleApi.register_web_resource(path: str, resource: IResource) -> None +</code></pre> +<p>The path is the full absolute path to register the resource at. For example, if you +register a resource for the path <code>/_synapse/client/my_super_module/say_hello</code>, Synapse +will serve it at <code>http(s)://[HS_URL]/_synapse/client/my_super_module/say_hello</code>. Note +that Synapse does not allow registering resources for several sub-paths in the <code>/_matrix</code> +namespace (such as anything under <code>/_matrix/client</code> for example). It is strongly +recommended that modules register their web resources under the <code>/_synapse/client</code> +namespace.</p> +<p>The provided resource is a Python class that implements Twisted's <a href="https://docs.twistedmatrix.com/en/stable/api/twisted.web.resource.IResource.html">IResource</a> +interface (such as <a href="https://docs.twistedmatrix.com/en/stable/api/twisted.web.resource.Resource.html">Resource</a>).</p> +<p>Only one resource can be registered for a given path. If several modules attempt to +register a resource for the same path, the module that appears first in Synapse's +configuration file takes priority.</p> +<p>Modules <strong>must</strong> register their web resources in their <code>__init__</code> method.</p> +<h2 id="registering-a-callback"><a class="header" href="#registering-a-callback">Registering a callback</a></h2> +<p>Modules can use Synapse's module API to register callbacks. Callbacks are functions that +Synapse will call when performing specific actions. Callbacks must be asynchronous (unless +specified otherwise), and are split in categories. A single module may implement callbacks +from multiple categories, and is under no obligation to implement all callbacks from the +categories it registers callbacks for.</p> +<p>Modules can register callbacks using one of the module API's <code>register_[...]_callbacks</code> +methods. The callback functions are passed to these methods as keyword arguments, with +the callback name as the argument name and the function as its value. A +<code>register_[...]_callbacks</code> method exists for each category.</p> +<p>Callbacks for each category can be found on their respective page of the +<a href="https://matrix-org.github.io/synapse">Synapse documentation website</a>.</p> +<h2 id="caching"><a class="header" href="#caching">Caching</a></h2> +<p><em>Added in Synapse 1.74.0.</em></p> +<p>Modules can leverage Synapse's caching tools to manage their own cached functions. This +can be helpful for modules that need to repeatedly request the same data from the database +or a remote service.</p> +<p>Functions that need to be wrapped with a cache need to be decorated with a <code>@cached()</code> +decorator (which can be imported from <code>synapse.module_api</code>) and registered with the +<a href="https://github.com/matrix-org/synapse/blob/release-v1.77/synapse/module_api/__init__.py#L888"><code>ModuleApi.register_cached_function</code></a> +API when initialising the module. If the module needs to invalidate an entry in a cache, +it needs to use the <a href="https://github.com/matrix-org/synapse/blob/release-v1.77/synapse/module_api/__init__.py#L904"><code>ModuleApi.invalidate_cache</code></a> +API, with the function to invalidate the cache of and the key(s) of the entry to +invalidate.</p> +<p>Below is an example of a simple module using a cached function:</p> +<pre><code class="language-python">from typing import Any +from synapse.module_api import cached, ModuleApi + +class MyModule: + def __init__(self, config: Any, api: ModuleApi): + self.api = api + + # Register the cached function so Synapse knows how to correctly invalidate + # entries for it. + self.api.register_cached_function(self.get_user_from_id) + + @cached() + async def get_department_for_user(self, user_id: str) -> str: + """A function with a cache.""" + # Request a department from an external service. + return await self.http_client.get_json( + "https://int.example.com/users", {"user_id": user_id) + )["department"] + + async def do_something_with_users(self) -> None: + """Calls the cached function and then invalidates an entry in its cache.""" + + user_id = "@alice:example.com" + + # Get the user. Since get_department_for_user is wrapped with a cache, + # the return value for this user_id will be cached. + department = await self.get_department_for_user(user_id) + + # Do something with `department`... + + # Let's say something has changed with our user, and the entry we have for + # them in the cache is out of date, so we want to invalidate it. + await self.api.invalidate_cache(self.get_department_for_user, (user_id,)) +</code></pre> +<p>See the <a href="https://github.com/matrix-org/synapse/blob/release-v1.77/synapse/module_api/__init__.py#L190"><code>cached</code> docstring</a> for more details.</p> + + </main> + + <nav class="nav-wrapper" aria-label="Page navigation"> + <!-- Mobile navigation buttons --> + <a rel="prev" href="../modules/index.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="../modules/spam_checker_callbacks.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="../modules/index.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="../modules/spam_checker_callbacks.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 |