288 lines
22 KiB
HTML
288 lines
22 KiB
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<title>Experimental features - Synapse</title>
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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 "><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
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<h1 class="menu-title">Synapse</h1>
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<h1 id="implementing-experimental-features-in-synapse"><a class="header" href="#implementing-experimental-features-in-synapse">Implementing experimental features in Synapse</a></h1>
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<p>It can be desirable to implement "experimental" features which are disabled by
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default and must be explicitly enabled via the Synapse configuration. This is
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applicable for features which:</p>
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<ul>
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<li>Are unstable in the Matrix spec (e.g. those defined by an MSC that has not yet been merged).</li>
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<li>Developers are not confident in their use by general Synapse administrators/users
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(e.g. a feature is incomplete, buggy, performs poorly, or needs further testing).</li>
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</ul>
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<p>Note that this only really applies to features which are expected to be desirable
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to a broad audience. The <a href="../modules/index.html">module infrastructure</a> should
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instead be investigated for non-standard features.</p>
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<p>Guarding experimental features behind configuration flags should help with some
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of the following scenarios:</p>
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<ul>
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<li>Ensure that clients do not assume that unstable features exist (failing
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gracefully if they do not).</li>
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<li>Unstable features do not become de-facto standards and can be removed
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aggressively (since only those who have opted-in will be affected).</li>
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<li>Ease finding the implementation of unstable features in Synapse (for future
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removal or stabilization).</li>
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<li>Ease testing a feature (or removal of feature) due to enabling/disabling without
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code changes. It also becomes possible to ask for wider testing, if desired.</li>
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</ul>
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<p>Experimental configuration flags should be disabled by default (requiring Synapse
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administrators to explicitly opt-in), although there are situations where it makes
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sense (from a product point-of-view) to enable features by default. This is
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expected and not an issue.</p>
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<p>It is not a requirement for experimental features to be behind a configuration flag,
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but one should be used if unsure.</p>
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<p>New experimental configuration flags should be added under the <code>experimental</code>
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configuration key (see the <code>synapse.config.experimental</code> file) and either explain
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(briefly) what is being enabled, or include the MSC number.</p>
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