mirror of
https://github.com/element-hq/synapse.git
synced 2024-12-21 12:14:29 +03:00
328 lines
23 KiB
HTML
328 lines
23 KiB
HTML
|
<!DOCTYPE HTML>
|
||
|
|
<html lang="en" class="sidebar-visible no-js light">
|
||
|
|
<head>
|
||
|
|
<!-- Book generated using mdBook -->
|
||
|
|
<meta charset="UTF-8">
|
||
|
|
<title>OpenTracing - 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 ? "navy" : "light";
|
||
|
|
</script>
|
||
|
|
|
||
|
|
<!-- Work around some values being stored in localStorage wrapped in quotes -->
|
||
|
|
<script type="text/javascript">
|
||
|
|
try {
|
||
|
|
var theme = localStorage.getItem('mdbook-theme');
|
||
|
|
var sidebar = localStorage.getItem('mdbook-sidebar');
|
||
|
|
if (theme.startsWith('"') && theme.endsWith('"')) {
|
||
|
|
localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
|
||
|
|
}
|
||
|
|
if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
|
||
|
|
localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
|
||
|
|
}
|
||
|
|
} catch (e) { }
|
||
|
|
</script>
|
||
|
|
|
||
|
|
<!-- Set the theme before any content is loaded, prevents flash -->
|
||
|
|
<script type="text/javascript">
|
||
|
|
var theme;
|
||
|
|
try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
|
||
|
|
if (theme === null || theme === undefined) { theme = default_theme; }
|
||
|
|
var html = document.querySelector('html');
|
||
|
|
html.classList.remove('no-js')
|
||
|
|
html.classList.remove('light')
|
||
|
|
html.classList.add(theme);
|
||
|
|
html.classList.add('js');
|
||
|
|
</script>
|
||
|
|
|
||
|
|
<!-- Hide / unhide sidebar before it is displayed -->
|
||
|
|
<script type="text/javascript">
|
||
|
|
var html = document.querySelector('html');
|
||
|
|
var sidebar = 'hidden';
|
||
|
|
if (document.body.clientWidth >= 1080) {
|
||
|
|
try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
|
||
|
|
sidebar = sidebar || 'visible';
|
||
|
|
}
|
||
|
|
html.classList.remove('sidebar-visible');
|
||
|
|
html.classList.add("sidebar-" + sidebar);
|
||
|
|
</script>
|
||
|
|
|
||
|
|
<nav id="sidebar" class="sidebar" aria-label="Table of contents">
|
||
|
|
<div class="sidebar-scrollbox">
|
||
|
|
<ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="setup/forward_proxy.html">Configuring a Forward/Outbound Proxy</a></li><li class="chapter-item expanded "><a href="turn-howto.html">Configuring a Turn Server</a></li><li class="chapter-item expanded "><a href="delegate.html">Delegation</a></li><li class="chapter-item expanded affix "><li class="part-title">Upgrading</li><li class="chapter-item expanded "><a href="upgrade.html">Upgrading between Synapse Versions</a></li><li class="chapter-item expanded "><a href="MSC1711_certificates_FAQ.html">Upgrading from pre-Synapse 1.0</a></li><li class="chapter-item expanded affix "><li class="part-title">Usage</li><li class="chapter-item expanded "><a href="federate.html">Federation</a></li><li class="chapter-item expanded "><a href="usage/configuration/index.html">Configuration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="usage/configuration/homeserver_sample_config.html">Homeserver Sample Config File</a></li><li class="chapter-item expanded "><a href="usage/configuration/logging_sample_config.html">Logging Sample Config File</a></li><li class="chapter-item expanded "><a href="structured_logging.html">Structured Logging</a></li><li class="chapter-item expanded "><a href="templates.html">Templates</a></li><li class="chapter-item expanded "><a href="usage/configuration/user_authentication/index.html">User Authentication</a></li><li><ol class="section"><li class="chapter-item expanded "><div>Single-Sign On</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="openid.html">OpenID Connect</a></li><li class="chapter-item expanded "><div>SAML</div></li><li class="chapter-item expanded "><div>CAS</div></li><li class="chapter-item expanded "><a href="sso_mapping_providers.html">SSO Mapping Providers</a></li></ol></li><li class="chapter-item expanded "><a href="password_auth_providers.html">Password Auth Providers</a></li><li class="chapter-item expanded "><a href="jwt.html">JSON Web Tokens</a></li></ol></li><li class="chapter-item expanded "><a href="CAPTCHA_SETUP.html">Registration Captcha</a></li><li class="chapter-item expanded "><a href="application_services.html">Application Services</a></li><li class="chapter-item expanded "><a href="server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="consent_tracking.html">Consent Tracking</a></li><li class="chapter-item expanded "><a href="development/url_previews.html">URL Previews</a></li><li class="chapter-item expanded "><a href="user_directory.html">User Directory</a></li><li class="chapter-item expanded "><a href="message_retention_policies.html">Message Retention Policies</a></li><li class="chapter-item expanded "><a href="modules/index.html">Pluggable Modules</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="modules/writing_a_module.html">Writing a module</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="modules/spam_checker_callbacks.html">Spam checker callbacks</a></li><li class="chapter-item expanded "><a href="modules/third_party_rules_callbacks.html">Third-party rules callbacks</a></li><li class="chapter-item expanded "><a href="modules/presence_router_callbacks.html">Presence router callbacks</a></li><li class="chapter-item expanded "><a href="modules/account_validity_callbacks.html">Account validity callbacks</a></li><li class="chapter-item expanded "><a href="modules/porting_legacy_module.html">Porting a legacy module to the new interface</a></li
|
||
|
|
</div>
|
||
|
|
<div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
|
||
|
|
</nav>
|
||
|
|
|
||
|
|
<div id="page-wrapper" class="page-wrapper">
|
||
|
|
|
||
|
|
<div class="page">
|
||
|
|
|
||
|
|
<div id="menu-bar-hover-placeholder"></div>
|
||
|
|
<div id="menu-bar" class="menu-bar sticky bordered">
|
||
|
|
<div class="left-buttons">
|
||
|
|
<button id="sidebar-toggle" class="icon-button" type="button" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
|
||
|
|
<i class="fa fa-bars"></i>
|
||
|
|
</button>
|
||
|
|
<button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list">
|
||
|
|
<i class="fa fa-paint-brush"></i>
|
||
|
|
</button>
|
||
|
|
<ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu">
|
||
|
|
<li role="none"><button role="menuitem" class="theme" id="light">Light (default)</button></li>
|
||
|
|
<li role="none"><button role="menuitem" class="theme" id="rust">Rust</button></li>
|
||
|
|
<li role="none"><button role="menuitem" class="theme" id="coal">Coal</button></li>
|
||
|
|
<li role="none"><button role="menuitem" class="theme" id="navy">Navy</button></li>
|
||
|
|
<li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li>
|
||
|
|
</ul>
|
||
|
|
|
||
|
|
<button id="search-toggle" class="icon-button" type="button" title="Search. (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/opentracing.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="opentracing"><a class="header" href="#opentracing">OpenTracing</a></h1>
|
||
|
|
<h2 id="background"><a class="header" href="#background">Background</a></h2>
|
||
|
|
<p>OpenTracing is a semi-standard being adopted by a number of distributed
|
||
|
|
tracing platforms. It is a common api for facilitating vendor-agnostic
|
||
|
|
tracing instrumentation. That is, we can use the OpenTracing api and
|
||
|
|
select one of a number of tracer implementations to do the heavy lifting
|
||
|
|
in the background. Our current selected implementation is Jaeger.</p>
|
||
|
|
<p>OpenTracing is a tool which gives an insight into the causal
|
||
|
|
relationship of work done in and between servers. The servers each track
|
||
|
|
events and report them to a centralised server - in Synapse's case:
|
||
|
|
Jaeger. The basic unit used to represent events is the span. The span
|
||
|
|
roughly represents a single piece of work that was done and the time at
|
||
|
|
which it occurred. A span can have child spans, meaning that the work of
|
||
|
|
the child had to be completed for the parent span to complete, or it can
|
||
|
|
have follow-on spans which represent work that is undertaken as a result
|
||
|
|
of the parent but is not depended on by the parent to in order to
|
||
|
|
finish.</p>
|
||
|
|
<p>Since this is undertaken in a distributed environment a request to
|
||
|
|
another server, such as an RPC or a simple GET, can be considered a span
|
||
|
|
(a unit or work) for the local server. This causal link is what
|
||
|
|
OpenTracing aims to capture and visualise. In order to do this metadata
|
||
|
|
about the local server's span, i.e the 'span context', needs to be
|
||
|
|
included with the request to the remote.</p>
|
||
|
|
<p>It is up to the remote server to decide what it does with the spans it
|
||
|
|
creates. This is called the sampling policy and it can be configured
|
||
|
|
through Jaeger's settings.</p>
|
||
|
|
<p>For OpenTracing concepts see
|
||
|
|
<a href="https://opentracing.io/docs/overview/what-is-tracing/">https://opentracing.io/docs/overview/what-is-tracing/</a>.</p>
|
||
|
|
<p>For more information about Jaeger's implementation see
|
||
|
|
<a href="https://www.jaegertracing.io/docs/">https://www.jaegertracing.io/docs/</a></p>
|
||
|
|
<h2 id="setting-up-opentracing"><a class="header" href="#setting-up-opentracing">Setting up OpenTracing</a></h2>
|
||
|
|
<p>To receive OpenTracing spans, start up a Jaeger server. This can be done
|
||
|
|
using docker like so:</p>
|
||
|
|
<pre><code class="language-sh">docker run -d --name jaeger \
|
||
|
|
-p 6831:6831/udp \
|
||
|
|
-p 6832:6832/udp \
|
||
|
|
-p 5778:5778 \
|
||
|
|
-p 16686:16686 \
|
||
|
|
-p 14268:14268 \
|
||
|
|
jaegertracing/all-in-one:1
|
||
|
|
</code></pre>
|
||
|
|
<p>Latest documentation is probably at
|
||
|
|
https://www.jaegertracing.io/docs/latest/getting-started.</p>
|
||
|
|
<h2 id="enable-opentracing-in-synapse"><a class="header" href="#enable-opentracing-in-synapse">Enable OpenTracing in Synapse</a></h2>
|
||
|
|
<p>OpenTracing is not enabled by default. It must be enabled in the
|
||
|
|
homeserver config by uncommenting the config options under <code>opentracing</code>
|
||
|
|
as shown in the <a href="./sample_config.yaml">sample config</a>. For example:</p>
|
||
|
|
<pre><code class="language-yaml">opentracing:
|
||
|
|
enabled: true
|
||
|
|
homeserver_whitelist:
|
||
|
|
- "mytrustedhomeserver.org"
|
||
|
|
- "*.myotherhomeservers.com"
|
||
|
|
</code></pre>
|
||
|
|
<h2 id="homeserver-whitelisting"><a class="header" href="#homeserver-whitelisting">Homeserver whitelisting</a></h2>
|
||
|
|
<p>The homeserver whitelist is configured using regular expressions. A list
|
||
|
|
of regular expressions can be given and their union will be compared
|
||
|
|
when propagating any spans contexts to another homeserver.</p>
|
||
|
|
<p>Though it's mostly safe to send and receive span contexts to and from
|
||
|
|
untrusted users since span contexts are usually opaque ids it can lead
|
||
|
|
to two problems, namely:</p>
|
||
|
|
<ul>
|
||
|
|
<li>If the span context is marked as sampled by the sending homeserver
|
||
|
|
the receiver will sample it. Therefore two homeservers with wildly
|
||
|
|
different sampling policies could incur higher sampling counts than
|
||
|
|
intended.</li>
|
||
|
|
<li>Sending servers can attach arbitrary data to spans, known as
|
||
|
|
'baggage'. For safety this has been disabled in Synapse but that
|
||
|
|
doesn't prevent another server sending you baggage which will be
|
||
|
|
logged to OpenTracing's logs.</li>
|
||
|
|
</ul>
|
||
|
|
<h2 id="configuring-jaeger"><a class="header" href="#configuring-jaeger">Configuring Jaeger</a></h2>
|
||
|
|
<p>Sampling strategies can be set as in this document:
|
||
|
|
<a href="https://www.jaegertracing.io/docs/latest/sampling/">https://www.jaegertracing.io/docs/latest/sampling/</a>.</p>
|
||
|
|
|
||
|
|
</main>
|
||
|
|
|
||
|
|
<nav class="nav-wrapper" aria-label="Page navigation">
|
||
|
|
<!-- Mobile navigation buttons -->
|
||
|
|
|
||
|
|
<a rel="prev" href="development/git.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="development/database_schema.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="development/git.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="development/database_schema.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>
|