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433 lines
27 KiB
HTML
433 lines
27 KiB
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<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 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 "><a href="usage/configuration/user_authentication/single_sign_on/index.html">Single-Sign On</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="openid.html">OpenID Connect</a></li><li class="chapter-item expanded "><a href="usage/configuration/user_authentication/single_sign_on/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="usage/configuration/user_authentication/single_sign_on/cas.html">CAS</a></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><li class="chapter-item expanded "><a href="usage/configuration/user_authentication/refresh_tokens.html">Refresh 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 "
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<h1 class="menu-title">Synapse</h1>
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<div id="content" class="content">
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<main>
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<!-- Page table of contents -->
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<div class="sidetoc">
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<nav class="pagetoc"></nav>
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</div>
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<h1 id="code-style"><a class="header" href="#code-style">Code Style</a></h1>
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<h2 id="formatting-tools"><a class="header" href="#formatting-tools">Formatting tools</a></h2>
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<p>The Synapse codebase uses a number of code formatting tools in order to
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quickly and automatically check for formatting (and sometimes logical)
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errors in code.</p>
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<p>The necessary tools are detailed below.</p>
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<p>First install them with:</p>
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<pre><code class="language-sh">pip install -e ".[lint,mypy]"
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</code></pre>
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<ul>
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<li>
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<p><strong>black</strong></p>
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<p>The Synapse codebase uses <a href="https://pypi.org/project/black/">black</a>
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as an opinionated code formatter, ensuring all comitted code is
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properly formatted.</p>
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<p>Have <code>black</code> auto-format your code (it shouldn't change any
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functionality) with:</p>
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<pre><code class="language-sh">black . --exclude="\.tox|build|env"
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</code></pre>
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</li>
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<li>
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<p><strong>flake8</strong></p>
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<p><code>flake8</code> is a code checking tool. We require code to pass <code>flake8</code>
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before being merged into the codebase.</p>
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<p>Check all application and test code with:</p>
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<pre><code class="language-sh">flake8 synapse tests
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</code></pre>
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</li>
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<li>
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<p><strong>isort</strong></p>
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<p><code>isort</code> ensures imports are nicely formatted, and can suggest and
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auto-fix issues such as double-importing.</p>
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<p>Auto-fix imports with:</p>
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<pre><code class="language-sh">isort -rc synapse tests
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</code></pre>
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<p><code>-rc</code> means to recursively search the given directories.</p>
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</li>
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</ul>
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<p>It's worth noting that modern IDEs and text editors can run these tools
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automatically on save. It may be worth looking into whether this
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functionality is supported in your editor for a more convenient
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development workflow. It is not, however, recommended to run <code>flake8</code> on
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save as it takes a while and is very resource intensive.</p>
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<h2 id="general-rules"><a class="header" href="#general-rules">General rules</a></h2>
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<ul>
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<li><strong>Naming</strong>:
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<ul>
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<li>Use camel case for class and type names</li>
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<li>Use underscores for functions and variables.</li>
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</ul>
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</li>
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<li><strong>Docstrings</strong>: should follow the <a href="https://google.github.io/styleguide/pyguide.html#38-comments-and-docstrings">google code
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style</a>.
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See the
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<a href="http://sphinxcontrib-napoleon.readthedocs.io/en/latest/example_google.html">examples</a>
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in the sphinx documentation.</li>
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<li><strong>Imports</strong>:
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<ul>
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<li>
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<p>Imports should be sorted by <code>isort</code> as described above.</p>
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</li>
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<li>
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<p>Prefer to import classes and functions rather than packages or
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modules.</p>
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<p>Example:</p>
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<pre><code class="language-python">from synapse.types import UserID
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...
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user_id = UserID(local, server)
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</code></pre>
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<p>is preferred over:</p>
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<pre><code class="language-python">from synapse import types
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...
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user_id = types.UserID(local, server)
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</code></pre>
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<p>(or any other variant).</p>
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<p>This goes against the advice in the Google style guide, but it
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means that errors in the name are caught early (at import time).</p>
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</li>
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<li>
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<p>Avoid wildcard imports (<code>from synapse.types import *</code>) and
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relative imports (<code>from .types import UserID</code>).</p>
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</li>
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</ul>
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</li>
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</ul>
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<h2 id="configuration-file-format"><a class="header" href="#configuration-file-format">Configuration file format</a></h2>
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<p>The <a href="./sample_config.yaml">sample configuration file</a> acts as a
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reference to Synapse's configuration options for server administrators.
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Remember that many readers will be unfamiliar with YAML and server
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administration in general, so that it is important that the file be as
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easy to understand as possible, which includes following a consistent
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format.</p>
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<p>Some guidelines follow:</p>
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<ul>
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<li>
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<p>Sections should be separated with a heading consisting of a single
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line prefixed and suffixed with <code>##</code>. There should be <strong>two</strong> blank
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lines before the section header, and <strong>one</strong> after.</p>
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</li>
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<li>
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<p>Each option should be listed in the file with the following format:</p>
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<ul>
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<li>
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<p>A comment describing the setting. Each line of this comment
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should be prefixed with a hash (<code>#</code>) and a space.</p>
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<p>The comment should describe the default behaviour (ie, what
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happens if the setting is omitted), as well as what the effect
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will be if the setting is changed.</p>
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<p>Often, the comment end with something like "uncomment the
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following to <do action>".</p>
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</li>
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<li>
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<p>A line consisting of only <code>#</code>.</p>
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</li>
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<li>
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<p>A commented-out example setting, prefixed with only <code>#</code>.</p>
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<p>For boolean (on/off) options, convention is that this example
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should be the <em>opposite</em> to the default (so the comment will end
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with "Uncomment the following to enable [or disable]
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<feature>." For other options, the example should give some
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non-default value which is likely to be useful to the reader.</p>
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</li>
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</ul>
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</li>
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<li>
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<p>There should be a blank line between each option.</p>
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</li>
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<li>
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<p>Where several settings are grouped into a single dict, <em>avoid</em> the
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convention where the whole block is commented out, resulting in
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comment lines starting <code># #</code>, as this is hard to read and confusing
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to edit. Instead, leave the top-level config option uncommented, and
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follow the conventions above for sub-options. Ensure that your code
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correctly handles the top-level option being set to <code>None</code> (as it
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will be if no sub-options are enabled).</p>
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</li>
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<li>
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<p>Lines should be wrapped at 80 characters.</p>
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</li>
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<li>
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||
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<p>Use two-space indents.</p>
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</li>
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<li>
|
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<p><code>true</code> and <code>false</code> are spelt thus (as opposed to <code>True</code>, etc.)</p>
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||
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</li>
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||
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<li>
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||
|
<p>Use single quotes (<code>'</code>) rather than double-quotes (<code>"</code>) or backticks
|
||
|
(<code>`</code>) to refer to configuration options.</p>
|
||
|
</li>
|
||
|
</ul>
|
||
|
<p>Example:</p>
|
||
|
<pre><code class="language-yaml">## Frobnication ##
|
||
|
|
||
|
# The frobnicator will ensure that all requests are fully frobnicated.
|
||
|
# To enable it, uncomment the following.
|
||
|
#
|
||
|
#frobnicator_enabled: true
|
||
|
|
||
|
# By default, the frobnicator will frobnicate with the default frobber.
|
||
|
# The following will make it use an alternative frobber.
|
||
|
#
|
||
|
#frobincator_frobber: special_frobber
|
||
|
|
||
|
# Settings for the frobber
|
||
|
#
|
||
|
frobber:
|
||
|
# frobbing speed. Defaults to 1.
|
||
|
#
|
||
|
#speed: 10
|
||
|
|
||
|
# frobbing distance. Defaults to 1000.
|
||
|
#
|
||
|
#distance: 100
|
||
|
</code></pre>
|
||
|
<p>Note that the sample configuration is generated from the synapse code
|
||
|
and is maintained by a script, <code>scripts-dev/generate_sample_config.sh</code>.
|
||
|
Making sure that the output from this script matches the desired format
|
||
|
is left as an exercise for the reader!</p>
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