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class="chapter-item expanded "><a href="deprecation_policy.html">Dependency Deprecation Policy</a></li></ol> + </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 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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/structured_logging.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="structured-logging"><a class="header" href="#structured-logging">Structured Logging</a></h1> +<p>A structured logging system can be useful when your logs are destined for a +machine to parse and process. By maintaining its machine-readable characteristics, +it enables more efficient searching and aggregations when consumed by software +such as the "ELK stack".</p> +<p>Synapse's structured logging system is configured via the file that Synapse's +<code>log_config</code> config option points to. The file should include a formatter which +uses the <code>synapse.logging.TerseJsonFormatter</code> class included with Synapse and a +handler which uses the above formatter.</p> +<p>There is also a <code>synapse.logging.JsonFormatter</code> option which does not include +a timestamp in the resulting JSON. This is useful if the log ingester adds its +own timestamp.</p> +<p>A structured logging configuration looks similar to the following:</p> +<pre><code class="language-yaml">version: 1 + +formatters: + structured: + class: synapse.logging.TerseJsonFormatter + +handlers: + file: + class: logging.handlers.TimedRotatingFileHandler + formatter: structured + filename: /path/to/my/logs/homeserver.log + when: midnight + backupCount: 3 # Does not include the current log file. + encoding: utf8 + +loggers: + synapse: + level: INFO + handlers: [remote] + synapse.storage.SQL: + level: WARNING +</code></pre> +<p>The above logging config will set Synapse as 'INFO' logging level by default, +with the SQL layer at 'WARNING', and will log to a file, stored as JSON.</p> +<p>It is also possible to figure Synapse to log to a remote endpoint by using the +<code>synapse.logging.RemoteHandler</code> class included with Synapse. It takes the +following arguments:</p> +<ul> +<li><code>host</code>: Hostname or IP address of the log aggregator.</li> +<li><code>port</code>: Numerical port to contact on the host.</li> +<li><code>maximum_buffer</code>: (Optional, defaults to 1000) The maximum buffer size to allow.</li> +</ul> +<p>A remote structured logging configuration looks similar to the following:</p> +<pre><code class="language-yaml">version: 1 + +formatters: + structured: + class: synapse.logging.TerseJsonFormatter + +handlers: + remote: + class: synapse.logging.RemoteHandler + formatter: structured + host: 10.1.2.3 + port: 9999 + +loggers: + synapse: + level: INFO + handlers: [remote] + synapse.storage.SQL: + level: WARNING +</code></pre> +<p>The above logging config will set Synapse as 'INFO' logging level by default, +with the SQL layer at 'WARNING', and will log JSON formatted messages to a +remote endpoint at 10.1.2.3:9999.</p> +<h2 id="upgrading-from-legacy-structured-logging-configuration"><a class="header" href="#upgrading-from-legacy-structured-logging-configuration">Upgrading from legacy structured logging configuration</a></h2> +<p>Versions of Synapse prior to v1.23.0 included a custom structured logging +configuration which is deprecated. It used a <code>structured: true</code> flag and +configured <code>drains</code> instead of <code>handlers</code> and <code>formatters</code>.</p> +<p>Synapse currently automatically converts the old configuration to the new +configuration, but this will be removed in a future version of Synapse. The +following reference can be used to update your configuration. Based on the drain +<code>type</code>, we can pick a new handler:</p> +<ol> +<li>For a type of <code>console</code>, <code>console_json</code>, or <code>console_json_terse</code>: a handler +with a class of <code>logging.StreamHandler</code> and a <code>stream</code> of <code>ext://sys.stdout</code> +or <code>ext://sys.stderr</code> should be used.</li> +<li>For a type of <code>file</code> or <code>file_json</code>: a handler of <code>logging.FileHandler</code> with +a location of the file path should be used.</li> +<li>For a type of <code>network_json_terse</code>: a handler of <code>synapse.logging.RemoteHandler</code> +with the host and port should be used.</li> +</ol> +<p>Then based on the drain <code>type</code> we can pick a new formatter:</p> +<ol> +<li>For a type of <code>console</code> or <code>file</code> no formatter is necessary.</li> +<li>For a type of <code>console_json</code> or <code>file_json</code>: a formatter of +<code>synapse.logging.JsonFormatter</code> should be used.</li> +<li>For a type of <code>console_json_terse</code> or <code>network_json_terse</code>: a formatter of +<code>synapse.logging.TerseJsonFormatter</code> should be used.</li> +</ol> +<p>For each new handler and formatter they should be added to the logging configuration +and then assigned to either a logger or the root logger.</p> +<p>An example legacy configuration:</p> +<pre><code class="language-yaml">structured: true + +loggers: + synapse: + level: INFO + synapse.storage.SQL: + level: WARNING + +drains: + console: + type: console + location: stdout + file: + type: file_json + location: homeserver.log +</code></pre> +<p>Would be converted into a new configuration:</p> +<pre><code class="language-yaml">version: 1 + +formatters: + json: + class: synapse.logging.JsonFormatter + +handlers: + console: + class: logging.StreamHandler + location: ext://sys.stdout + file: + class: logging.FileHandler + formatter: json + filename: homeserver.log + +loggers: + synapse: + level: INFO + handlers: [console, file] + synapse.storage.SQL: + level: WARNING +</code></pre> +<p>The new logging configuration is a bit more verbose, but significantly more +flexible. It allows for configuration that were not previously possible, such as +sending plain logs over the network, or using different handlers for different +modules.</p> + + </main> + + <nav class="nav-wrapper" aria-label="Page navigation"> + <!-- Mobile navigation buttons --> + + <a rel="prev" href="usage/configuration/logging_sample_config.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="usage/configuration/user_authentication/index.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="usage/configuration/logging_sample_config.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="usage/configuration/user_authentication/index.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 |