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328 lines
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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/config_documentation.html">Configuration Manual</a></li><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 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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="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/password_auth_provider_callbacks.html">Password auth provider callbacks</a></li><li class="chapter-item expanded "><a href="modules/background_update_controller_callbacks.html">Background update controller callbacks</a></li><li class="chapter-item expanded "><a href="modules/account_data_callbacks.html">Account data 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></ol></li></ol></li><li class="chapter-item expanded "><a href="workers.html">Workers</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="synctl_workers.html">Using synctl with Workers</a></li><li class="chapter-item expanded "><a href="systemd-with-workers/index.html">Systemd</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="usage/administration/index.html">Administration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="usage/administration/admin_api/index.html">Admin API</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="admin_api/account_validity.html">Account Validity</a></li><li class="chapter-item expanded "><a href="usage/administration/admin_api/background_updates.html">Background Updates</a></li><li class="chapter-item expanded "><a href="admin_api/event_reports.html">Event Reports</a></li><li class="chapter-item expanded "><a href="admin_api/media_admin_api.html">Media</a></li><li class="chapter-item expanded "><a href="admin_api/purge_history_api.html">Purge History</a></li><li class="chapter-item expanded "><a href="admin_api/register_api.html">Register Users</a></li><li class="chapter-item expanded "><a href="usage/administration/admin_api/registration_tokens.html">Registration Tokens</a></li><li class="chapter-item expanded "><a href="admin_api/room_membership.html">Manipulate Room Membership</a></li><li class="chapter-item expanded "><a href="admin_api/rooms.html">Rooms</a></li><li class="chapter-item expanded "><a href="admin_api/server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="admin_api/statistics.html">Statistics</a></li><li class="chapter-item expanded "><a href="admin_api/user_admin_api.html">Users</a></li><li class="chapter-item expanded "><a href="admin_api/version_api.html">Server Version</a></li><li class="chapter-item expanded "><a href="usage/administration/admin_api/federation.html">Federation</a></li></ol></li><li class="chapter-item expanded "><a href="manhole.html">Manhole</a></li><li class="chapter-item expanded "><a href="metrics-howto.html">Monitoring</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="usage/administration/monitoring/reporting_homeserver_usage_statistics.html">Reporting Homeserver Usage Statistics</a></li></ol></li><li class="chapter-item expanded "><a href="usage/administration/understanding_synapse_through_grafana_graphs.html">Understanding Synapse Through Grafana Graphs</a></li><li class="chapter-item expanded "><a href="usage/administration/useful_sql_for_admins.html">Useful SQL for Admins</a></li><li class="chapter-item expanded "><a href="usage/administration/database_maintenance_tools.html">Database Maintenance Tools</a></li><li class="chapter-item expanded "><a href="usage/administration/state_groups.html">State Groups</a></li><li class="chapter-item expanded "><a href="usage/administration/request_log.html">Request log format</a></li><li class="chapter-item expanded "><a href="usage/administration/admin_faq.html">Admin FAQ</a></li><li class="chapter-item expanded "><div>Scripts</div></li></ol></li><li class="chapter-item expanded "><li class="part-title">Development</li><li class="chapter-item expanded "><a href="development/contributing_guide.html">Contributing Guide</a></li><li class="chapter-item expanded "><a href="code_style.html" class="active">Code Style</a></li><li class="chapter-item expanded "><a href="development/reviews.html">Reviewing Code</a></li><li class="chapter-item expanded "><a href="development/releases.html">Release Cycle</a></li><li class="chapter-item expanded "><a href="development/git.html">Git Usage</a></li><li class="chapter-item expanded "><div>Testing</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="development/demo.html">Demo scripts</a></li></ol></li><li class="chapter-item expanded "><a href="opentracing.html">OpenTracing</a></li><li class="chapter-item expanded "><a href="development/database_schema.html">Database Schemas</a></li><li class="chapter-item expanded "><a href="development/experimental_features.html">Experimental features</a></li><li class="chapter-item expanded "><a href="development/dependencies.html">Dependency management</a></li><li class="chapter-item expanded "><div>Synapse Architecture</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="development/synapse_architecture/cancellation.html">Cancellation</a></li><li class="chapter-item expanded "><a href="log_contexts.html">Log Contexts</a></li><li class="chapter-item expanded "><a href="replication.html">Replication</a></li><li class="chapter-item expanded "><a href="tcp_replication.html">TCP Replication</a></li></ol></li><li class="chapter-item expanded "><a href="development/internal_documentation/index.html">Internal Documentation</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="development/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="development/cas.html">CAS</a></li></ol></li><li class="chapter-item expanded "><a href="development/room-dag-concepts.html">Room DAG concepts</a></li><li class="chapter-item expanded "><div>State Resolution</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="auth_chain_difference_algorithm.html">The Auth Chain Difference Algorithm</a></li></ol></li><li class="chapter-item expanded "><a href="media_repository.html">Media Repository</a></li><li class="chapter-item expanded "><a href="room_and_user_statistics.html">Room and User Statistics</a></li></ol></li><li class="chapter-item expanded "><div>Scripts</div></li><li class="chapter-item expanded affix "><li class="part-title">Other</li><li class="chapter-item expanded "><a href="deprecation_policy.html">Dependency Deprecation Policy</a></li><li class="chapter-item expanded "><a href="other/running_synapse_on_single_board_computers.html">Running Synapse on a Single-Board Computer</a></li></ol>
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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:</p>
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<ul>
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<li><a href="https://black.readthedocs.io/en/stable/">black</a>, a source code formatter;</li>
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<li><a href="https://pycqa.github.io/isort/">isort</a>, which organises each file's imports;</li>
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<li><a href="https://flake8.pycqa.org/en/latest/">flake8</a>, which can spot common errors; and</li>
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<li><a href="https://mypy.readthedocs.io/en/stable/">mypy</a>, a type checker.</li>
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</ul>
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<p>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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<p>The easiest way to run the lints is to invoke the linter script as follows.</p>
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<pre><code class="language-sh">scripts-dev/lint.sh
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</code></pre>
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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> or <code>mypy</code>
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on save as they take a while and can be 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 <code>CamelCase</code> for class and type names</li>
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<li>Use underscores for <code>function_names</code> and <code>variable_names</code>.</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-code-and-documentation-format"><a class="header" href="#configuration-code-and-documentation-format">Configuration code and documentation format</a></h2>
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<p>When adding a configuration option to the code, if several settings are grouped into a single dict, ensure that your code
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correctly handles the top-level option being set to <code>None</code> (as it will be if no sub-options are enabled).</p>
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<p>The <a href="usage/configuration/config_documentation.html">configuration manual</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 it is important that when you add
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a configuration option the documentation be as easy to understand as possible, which
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includes following a consistent 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>Each option should be listed in the config manual with the following format:</p>
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<ul>
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<li>
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<p>The name of the option, prefixed by <code>###</code>. </p>
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</li>
|
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<li>
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<p>A comment which describes the default behaviour (i.e. 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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</li>
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<li>
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<p>An example setting, using backticks to define the code block</p>
|
|
<p>For boolean (on/off) options, convention is that this example
|
|
should be the <em>opposite</em> to the default. For other options, the example should give
|
|
some non-default value which is likely to be useful to the reader.</p>
|
|
</li>
|
|
</ul>
|
|
</li>
|
|
<li>
|
|
<p>There should be a horizontal rule between each option, which can be achieved by adding <code>---</code> before and
|
|
after the option.</p>
|
|
</li>
|
|
<li>
|
|
<p><code>true</code> and <code>false</code> are spelt thus (as opposed to <code>True</code>, etc.)</p>
|
|
</li>
|
|
</ul>
|
|
<p>Example:</p>
|
|
<hr />
|
|
<h3 id="modules"><a class="header" href="#modules"><code>modules</code></a></h3>
|
|
<p>Use the <code>module</code> sub-option to add a module under <code>modules</code> to extend functionality.
|
|
The <code>module</code> setting then has a sub-option, <code>config</code>, which can be used to define some configuration
|
|
for the <code>module</code>.</p>
|
|
<p>Defaults to none.</p>
|
|
<p>Example configuration:</p>
|
|
<pre><code class="language-yaml">modules:
|
|
- module: my_super_module.MySuperClass
|
|
config:
|
|
do_thing: true
|
|
- module: my_other_super_module.SomeClass
|
|
config: {}
|
|
</code></pre>
|
|
<hr />
|
|
<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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