Update black, and run auto formatting over the codebase (#9381)

 - Update black version to the latest
 - Run black auto formatting over the codebase
    - Run autoformatting according to [`docs/code_style.md
`](https://github.com/matrix-org/synapse/blob/80d6dc9783aa80886a133756028984dbf8920168/docs/code_style.md)
 - Update `code_style.md` docs around installing black to use the correct version

5 files changed, 23 insertions, 13 deletions

diff --git a/synapse/logging/_remote.py b/synapse/logging/_remote.py
index fb937b3f28..f8e9112b56 100644
--- a/synapse/logging/_remote.py
+++ b/synapse/logging/_remote.py
@@ -174,7 +174,9 @@ class RemoteHandler(logging.Handler):
 
             # Make a new producer and start it.
             self._producer = LogProducer(
-                buffer=self._buffer, transport=result.transport, format=self.format,
+                buffer=self._buffer,
+                transport=result.transport,
+                format=self.format,
             )
             result.transport.registerProducer(self._producer, True)
             self._producer.resumeProducing()
diff --git a/synapse/logging/_structured.py b/synapse/logging/_structured.py
index 14d9c104c2..3e054f615c 100644
--- a/synapse/logging/_structured.py
+++ b/synapse/logging/_structured.py
@@ -60,7 +60,10 @@ def parse_drain_configs(
             )
 
         # Either use the default formatter or the tersejson one.
-        if logging_type in (DrainType.CONSOLE_JSON, DrainType.FILE_JSON,):
+        if logging_type in (
+            DrainType.CONSOLE_JSON,
+            DrainType.FILE_JSON,
+        ):
             formatter = "json"  # type: Optional[str]
         elif logging_type in (
             DrainType.CONSOLE_JSON_TERSE,
@@ -131,7 +134,9 @@ def parse_drain_configs(
             )
 
 
-def setup_structured_logging(log_config: dict,) -> dict:
+def setup_structured_logging(
+    log_config: dict,
+) -> dict:
     """
     Convert a legacy structured logging configuration (from Synapse < v1.23.0)
     to one compatible with the new standard library handlers.
diff --git a/synapse/logging/context.py b/synapse/logging/context.py
index c2db8b45f3..78e27bfb00 100644
--- a/synapse/logging/context.py
+++ b/synapse/logging/context.py
@@ -338,7 +338,10 @@ class LoggingContext:
         if self.previous_context != old_context:
             logcontext_error(
                 "Expected previous context %r, found %r"
-                % (self.previous_context, old_context,)
+                % (
+                    self.previous_context,
+                    old_context,
+                )
             )
         return self
 
@@ -562,7 +565,7 @@ class LoggingContextFilter(logging.Filter):
 class PreserveLoggingContext:
     """Context manager which replaces the logging context
 
-     The previous logging context is restored on exit."""
+    The previous logging context is restored on exit."""
 
     __slots__ = ["_old_context", "_new_context"]
 
@@ -585,7 +588,10 @@ class PreserveLoggingContext:
             else:
                 logcontext_error(
                     "Expected logging context %s but found %s"
-                    % (self._new_context, context,)
+                    % (
+                        self._new_context,
+                        context,
+                    )
                 )
 
 
diff --git a/synapse/logging/opentracing.py b/synapse/logging/opentracing.py
index 0538350f38..10bd4a1461 100644
--- a/synapse/logging/opentracing.py
+++ b/synapse/logging/opentracing.py
@@ -238,8 +238,7 @@ try:
 
     @attr.s(slots=True, frozen=True)
     class _WrappedRustReporter:
-        """Wrap the reporter to ensure `report_span` never throws.
-        """
+        """Wrap the reporter to ensure `report_span` never throws."""
 
         _reporter = attr.ib(type=Reporter, default=attr.Factory(Reporter))
 
@@ -326,8 +325,7 @@ def noop_context_manager(*args, **kwargs):
 
 
 def init_tracer(hs: "HomeServer"):
-    """Set the whitelists and initialise the JaegerClient tracer
-    """
+    """Set the whitelists and initialise the JaegerClient tracer"""
     global opentracing
     if not hs.config.opentracer_enabled:
         # We don't have a tracer
@@ -384,7 +382,7 @@ def whitelisted_homeserver(destination):
 
     Args:
         destination (str)
-        """
+    """
 
     if _homeserver_whitelist:
         return _homeserver_whitelist.match(destination)
diff --git a/synapse/logging/utils.py b/synapse/logging/utils.py
index becf66dd86..fd3543ab04 100644
--- a/synapse/logging/utils.py
+++ b/synapse/logging/utils.py
@@ -43,8 +43,7 @@ def _log_debug_as_f(f, msg, msg_args):
 
 
 def log_function(f):
-    """ Function decorator that logs every call to that function.
-    """
+    """Function decorator that logs every call to that function."""
     func_name = f.__name__
 
     @wraps(f)