diff --git a/synapse/logging/tracing.py b/synapse/logging/tracing.py
index e3a1a010a2..1b509ffdcd 100644
--- a/synapse/logging/tracing.py
+++ b/synapse/logging/tracing.py
@@ -789,67 +789,110 @@ def extract_text_map(
# Tracing decorators
-def trace_with_opname(opname: str) -> Callable[[Callable[P, R]], Callable[P, R]]:
+def _custom_sync_async_decorator(
+ func: Callable[P, R],
+ wrapping_logic: Callable[[Callable[P, R], Any, Any], ContextManager[None]],
+) -> Callable[P, R]:
"""
- Decorator to trace a function with a custom opname.
-
- See the module's doc string for usage examples.
+ Decorates a function that is sync or async (coroutines), or that returns a Twisted
+ `Deferred`. The custom business logic of the decorator goes in `wrapping_logic`.
+
+ Example usage:
+ ```py
+ # Decorator to time the function and log it out
+ def duration(func: Callable[P, R]) -> Callable[P, R]:
+ @contextlib.contextmanager
+ def _wrapping_logic(func: Callable[P, R], *args: P.args, **kwargs: P.kwargs) -> Generator[None, None, None]:
+ start_ts = time.time()
+ try:
+ yield
+ finally:
+ end_ts = time.time()
+ duration = end_ts - start_ts
+ logger.info("%s took %s seconds", func.__name__, duration)
+ return _custom_sync_async_decorator(func, _wrapping_logic)
+ ```
+ Args:
+ func: The function to be decorated
+ wrapping_logic: The business logic of your custom decorator.
+ This should be a ContextManager so you are able to run your logic
+ before/after the function as desired.
"""
- def decorator(func: Callable[P, R]) -> Callable[P, R]:
- if opentelemetry is None:
- return func # type: ignore[unreachable]
+ if inspect.iscoroutinefunction(func):
+
+ @wraps(func)
+ async def _wrapper(*args: P.args, **kwargs: P.kwargs) -> R:
+ with wrapping_logic(func, *args, **kwargs):
+ return await func(*args, **kwargs) # type: ignore[misc]
- if inspect.iscoroutinefunction(func):
+ else:
+ # The other case here handles both sync functions and those
+ # decorated with inlineDeferred.
+ @wraps(func)
+ def _wrapper(*args: P.args, **kwargs: P.kwargs) -> R:
+ scope = wrapping_logic(func, *args, **kwargs)
+ scope.__enter__()
- @wraps(func)
- async def _trace_inner(*args: P.args, **kwargs: P.kwargs) -> R:
- with start_active_span(opname):
- return await func(*args, **kwargs) # type: ignore[misc]
+ try:
+ result = func(*args, **kwargs)
+ if isinstance(result, defer.Deferred):
- else:
- # The other case here handles both sync functions and those
- # decorated with inlineDeferred.
- @wraps(func)
- def _trace_inner(*args: P.args, **kwargs: P.kwargs) -> R:
- scope = start_active_span(opname)
- scope.__enter__()
-
- try:
- result = func(*args, **kwargs)
- if isinstance(result, defer.Deferred):
-
- def call_back(result: R) -> R:
- scope.__exit__(None, None, None)
- return result
-
- def err_back(result: R) -> R:
- scope.__exit__(None, None, None)
- return result
-
- result.addCallbacks(call_back, err_back)
-
- else:
- if inspect.isawaitable(result):
- logger.error(
- "@trace may not have wrapped %s correctly! "
- "The function is not async but returned a %s.",
- func.__qualname__,
- type(result).__name__,
- )
+ def call_back(result: R) -> R:
+ scope.__exit__(None, None, None)
+ return result
+ def err_back(result: R) -> R:
scope.__exit__(None, None, None)
+ return result
+
+ result.addCallbacks(call_back, err_back)
+
+ else:
+ if inspect.isawaitable(result):
+ logger.error(
+ "@trace may not have wrapped %s correctly! "
+ "The function is not async but returned a %s.",
+ func.__qualname__,
+ type(result).__name__,
+ )
+
+ scope.__exit__(None, None, None)
- return result
+ return result
- except Exception as e:
- scope.__exit__(type(e), None, e.__traceback__)
- raise
+ except Exception as e:
+ scope.__exit__(type(e), None, e.__traceback__)
+ raise
- return _trace_inner # type: ignore[return-value]
+ return _wrapper # type: ignore[return-value]
- return decorator
+
+def trace_with_opname(
+ opname: str,
+ *,
+ tracer: Optional["opentelemetry.trace.Tracer"] = None,
+) -> Callable[[Callable[P, R]], Callable[P, R]]:
+ """
+ Decorator to trace a function with a custom opname.
+ See the module's doc string for usage examples.
+ """
+ # type-ignore: mypy bug, see https://github.com/python/mypy/issues/12909
+ @contextlib.contextmanager # type: ignore[arg-type]
+ def _wrapping_logic(
+ func: Callable[P, R], *args: P.args, **kwargs: P.kwargs
+ ) -> Generator[None, None, None]:
+ with start_active_span(opname, tracer=tracer):
+ yield
+
+ def _decorator(func: Callable[P, R]) -> Callable[P, R]:
+ if not opentelemetry:
+ return func
+
+ return _custom_sync_async_decorator(func, _wrapping_logic)
+
+ return _decorator
def trace(func: Callable[P, R]) -> Callable[P, R]:
@@ -872,16 +915,25 @@ def tag_args(func: Callable[P, R]) -> Callable[P, R]:
if not opentelemetry:
return func
- @wraps(func)
- def _tag_args_inner(*args: P.args, **kwargs: P.kwargs) -> R:
+ # type-ignore: mypy bug, see https://github.com/python/mypy/issues/12909
+ @contextlib.contextmanager # type: ignore[arg-type]
+ def _wrapping_logic(
+ func: Callable[P, R], *args: P.args, **kwargs: P.kwargs
+ ) -> Generator[None, None, None]:
argspec = inspect.getfullargspec(func)
- for i, arg in enumerate(argspec.args[1:]):
- set_attribute("ARG_" + arg, str(args[i])) # type: ignore[index]
+ # We use `[1:]` to skip the `self` object reference and `start=1` to
+ # make the index line up with `argspec.args`.
+ #
+ # FIXME: We could update this to handle any type of function by ignoring the
+ # first argument only if it's named `self` or `cls`. This isn't fool-proof
+ # but handles the idiomatic cases.
+ for i, arg in enumerate(args[1:], start=1): # type: ignore[index]
+ set_attribute("ARG_" + argspec.args[i], str(arg))
set_attribute("args", str(args[len(argspec.args) :])) # type: ignore[index]
set_attribute("kwargs", str(kwargs))
- return func(*args, **kwargs)
+ yield
- return _tag_args_inner
+ return _custom_sync_async_decorator(func, _wrapping_logic)
@contextlib.contextmanager
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