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| author | squahtx <squahtx@users.noreply.github.com> | 2021-12-07 16:49:28 +0000 |
|---|---|---|
| committer | squahtx <squahtx@users.noreply.github.com> | 2021-12-07 16:49:28 +0000 |
| commit | 79a638bcf930a9cca39a4610a5ee99f0a3cd58fd (patch) | |
| tree | 1df3c58ec40faa1b7e57aed8f8e2c222626466fd /latest/modules/background_update_controller_callbacks.html | |
| parent | deploy: 26b5d2320f62b5eb6262c7614fbdfc364a4dfc02 (diff) | |
| download | synapse-79a638bcf930a9cca39a4610a5ee99f0a3cd58fd.tar.xz | |
deploy: 158d73ebdd61eef33831ae5f6990acf07244fc55
Diffstat (limited to 'latest/modules/background_update_controller_callbacks.html')
| -rw-r--r-- | latest/modules/background_update_controller_callbacks.html | 302 |
1 files changed, 0 insertions, 302 deletions
diff --git a/latest/modules/background_update_controller_callbacks.html b/latest/modules/background_update_controller_callbacks.html deleted file mode 100644 index 8b8b36d119..0000000000 --- a/latest/modules/background_update_controller_callbacks.html +++ /dev/null @@ -1,302 +0,0 @@ -<!DOCTYPE HTML> -<html lang="en" class="sidebar-visible no-js light"> - <head> - <!-- Book generated using mdBook --> - <meta charset="UTF-8"> - <title>Background update controller callbacks - 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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A database background update is an operation -Synapse runs on its database in the background after it starts. It's usually used to run -database operations that would take too long if they were run at the same time as schema -updates (which are run on startup) and delay Synapse's startup too much: populating a -table with a big amount of data, adding an index on a big table, deleting superfluous data, -etc.</p> -<p>Background update controller callbacks can be registered using the module API's -<code>register_background_update_controller_callbacks</code> method. Only the first module (in order -of appearance in Synapse's configuration file) calling this method can register background -update controller callbacks, subsequent calls are ignored.</p> -<p>The available background update controller callbacks are:</p> -<h3 id="on_update"><a class="header" href="#on_update"><code>on_update</code></a></h3> -<p><em>First introduced in Synapse v1.49.0</em></p> -<pre><code class="language-python">def on_update(update_name: str, database_name: str, one_shot: bool) -> AsyncContextManager[int] -</code></pre> -<p>Called when about to do an iteration of a background update. The module is given the name -of the update, the name of the database, and a flag to indicate whether the background -update will happen in one go and may take a long time (e.g. creating indices). If this last -argument is set to <code>False</code>, the update will be run in batches.</p> -<p>The module must return an async context manager. It will be entered before Synapse runs a -background update; this should return the desired duration of the iteration, in -milliseconds.</p> -<p>The context manager will be exited when the iteration completes. Note that the duration -returned by the context manager is a target, and an iteration may take substantially longer -or shorter. If the <code>one_shot</code> flag is set to <code>True</code>, the duration returned is ignored.</p> -<p><strong>Note</strong>: Unlike most module callbacks in Synapse, this one is <em>synchronous</em>. This is -because asynchronous operations are expected to be run by the async context manager.</p> -<p>This callback is required when registering any other background update controller callback.</p> -<h3 id="default_batch_size"><a class="header" href="#default_batch_size"><code>default_batch_size</code></a></h3> -<p><em>First introduced in Synapse v1.49.0</em></p> -<pre><code class="language-python">async def default_batch_size(update_name: str, database_name: str) -> int -</code></pre> -<p>Called before the first iteration of a background update, with the name of the update and -of the database. The module must return the number of elements to process in this first -iteration.</p> -<p>If this callback is not defined, Synapse will use a default value of 100.</p> -<h3 id="min_batch_size"><a class="header" href="#min_batch_size"><code>min_batch_size</code></a></h3> -<p><em>First introduced in Synapse v1.49.0</em></p> -<pre><code class="language-python">async def min_batch_size(update_name: str, database_name: str) -> int -</code></pre> -<p>Called before running a new batch for a background update, with the name of the update and -of the database. The module must return an integer representing the minimum number of -elements to process in this iteration. This number must be at least 1, and is used to -ensure that progress is always made.</p> -<p>If this callback is not defined, Synapse will use a default value of 100.</p> - - </main> - - <nav class="nav-wrapper" aria-label="Page navigation"> - <!-- Mobile navigation buttons --> - - <a rel="prev" href="../modules/password_auth_provider_callbacks.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/porting_legacy_module.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/password_auth_provider_callbacks.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/porting_legacy_module.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 |