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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 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
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< h1 id = "code-style" > < a class = "header" href = "#code-style" > Code Style< / a > < / h1 >
< h2 id = "formatting-tools" > < a class = "header" href = "#formatting-tools" > Formatting tools< / a > < / h2 >
< p > The Synapse codebase uses a number of code formatting tools in order to
quickly and automatically check for formatting (and sometimes logical)
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 >
< li > < a href = "https://pycqa.github.io/isort/" > isort< / a > , which organises each file's imports;< / li >
< li > < a href = "https://flake8.pycqa.org/en/latest/" > flake8< / a > , which can spot common errors; and< / li >
< li > < a href = "https://mypy.readthedocs.io/en/stable/" > mypy< / a > , a type checker.< / li >
< / ul >
< p > Install them with:< / p >
< 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 >
< pre > < code class = "language-sh" > scripts-dev/lint.sh
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< / code > < / pre >
< p > It's worth noting that modern IDEs and text editors can run these tools
automatically on save. It may be worth looking into whether this
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 >
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 >
< ul >
< li > < strong > Naming< / strong > :
< ul >
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< li > Use < code > CamelCase< / code > for class and type names< / li >
< li > Use underscores for < code > function_names< / code > and < code > variable_names< / code > .< / li >
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< / ul >
< / li >
< li > < strong > Docstrings< / strong > : should follow the < a href = "https://google.github.io/styleguide/pyguide.html#38-comments-and-docstrings" > google code
style< / a > .
See the
< a href = "http://sphinxcontrib-napoleon.readthedocs.io/en/latest/example_google.html" > examples< / a >
in the sphinx documentation.< / li >
< li > < strong > Imports< / strong > :
< ul >
< li >
< p > Imports should be sorted by < code > isort< / code > as described above.< / p >
< / li >
< li >
< p > Prefer to import classes and functions rather than packages or
modules.< / p >
< p > Example:< / p >
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< pre > < code class = "language-python" > from synapse.types import UserID
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...
user_id = UserID(local, server)
< / code > < / pre >
< p > is preferred over:< / p >
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< pre > < code class = "language-python" > from synapse import types
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...
user_id = types.UserID(local, server)
< / code > < / pre >
< p > (or any other variant).< / p >
< p > This goes against the advice in the Google style guide, but it
means that errors in the name are caught early (at import time).< / p >
< / li >
< li >
< p > Avoid wildcard imports (< code > from synapse.types import *< / code > ) and
relative imports (< code > from .types import UserID< / code > ).< / p >
< / li >
< / ul >
< / li >
< / 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 >
< p > When adding a configuration option to the code, if several settings are grouped into a single dict, ensure that your code
correctly handles the top-level option being set to < code > None< / code > (as it will be if no sub-options are enabled).< / p >
< 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.
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
a configuration option the documentation be as easy to understand as possible, which
includes following a consistent format.< / p >
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< p > Some guidelines follow:< / p >
< ul >
< 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 >
< li >
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< p > The name of the option, prefixed by < code > ###< / code > . < / p >
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< / li >
< li >
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< p > A comment which describes the default behaviour (i.e. what
happens if the setting is omitted), as well as what the effect
will be if the setting is changed.< / p >
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< / li >
< li >
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< p > An example setting, using backticks to define the code block< / 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. For other options, the example should give
some non-default value which is likely to be useful to the reader.< / p >
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< / li >
< / ul >
< / li >
< li >
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< p > There should be a horizontal rule between each option, which can be achieved by adding < code > ---< / code > before and
after the option.< / p >
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< / 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 >
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< 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: {}
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< / code > < / pre >
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< hr / >
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< p > Note that the sample configuration is generated from the synapse code
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and is maintained by a script, < code > scripts-dev/generate_sample_config.sh< / code > .
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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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