diff --git a/changelog.d/13453.misc b/changelog.d/13453.misc
new file mode 100644
index 0000000000..d30c5230c8
--- /dev/null
+++ b/changelog.d/13453.misc
@@ -0,0 +1 @@
+Allow use of both `@trace` and `@tag_args` stacked on the same function (tracing).
diff --git a/synapse/logging/opentracing.py b/synapse/logging/opentracing.py
index fa3f76c27f..d1fa2cf8ae 100644
--- a/synapse/logging/opentracing.py
+++ b/synapse/logging/opentracing.py
@@ -173,6 +173,7 @@ from typing import (
Any,
Callable,
Collection,
+ ContextManager,
Dict,
Generator,
Iterable,
@@ -823,75 +824,117 @@ def extract_text_map(carrier: Dict[str, str]) -> Optional["opentracing.SpanConte
# 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 opentracing is None:
- return func # type: ignore[unreachable]
+ if inspect.iscoroutinefunction(func):
- 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]
- @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]
+ 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__()
- 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__,
- )
+ 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__,
+ )
+
+ 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["opentracing.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 opentracing:
+ return func
+
+ return _custom_sync_async_decorator(func, _wrapping_logic)
+
+ return _decorator
def trace(func: Callable[P, R]) -> Callable[P, R]:
"""
Decorator to trace a function.
-
Sets the operation name to that of the function's name.
-
See the module's doc string for usage examples.
"""
@@ -900,7 +943,7 @@ def trace(func: Callable[P, R]) -> Callable[P, R]:
def tag_args(func: Callable[P, R]) -> Callable[P, R]:
"""
- Tags all of the args to the active span.
+ Decorator to tag all of the args to the active span.
Args:
func: `func` is assumed to be a method taking a `self` parameter, or a
@@ -911,22 +954,25 @@ def tag_args(func: Callable[P, R]) -> Callable[P, R]:
if not opentracing:
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)
# 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 handle any type of function by ignoring the
+ # 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_tag("ARG_" + argspec.args[i], str(arg))
set_tag("args", str(args[len(argspec.args) :])) # type: ignore[index]
set_tag("kwargs", str(kwargs))
- return func(*args, **kwargs)
+ yield
- return _tag_args_inner
+ return _custom_sync_async_decorator(func, _wrapping_logic)
@contextlib.contextmanager
diff --git a/tests/logging/test_opentracing.py b/tests/logging/test_opentracing.py
index 3b14c76d7e..0917e478a5 100644
--- a/tests/logging/test_opentracing.py
+++ b/tests/logging/test_opentracing.py
@@ -25,6 +25,8 @@ from synapse.logging.context import (
from synapse.logging.opentracing import (
start_active_span,
start_active_span_follows_from,
+ tag_args,
+ trace_with_opname,
)
from synapse.util import Clock
@@ -38,8 +40,12 @@ try:
except ImportError:
jaeger_client = None # type: ignore
+import logging
+
from tests.unittest import TestCase
+logger = logging.getLogger(__name__)
+
class LogContextScopeManagerTestCase(TestCase):
"""
@@ -194,3 +200,80 @@ class LogContextScopeManagerTestCase(TestCase):
self._reporter.get_spans(),
[scopes[1].span, scopes[2].span, scopes[0].span],
)
+
+ def test_trace_decorator_sync(self) -> None:
+ """
+ Test whether we can use `@trace_with_opname` (`@trace`) and `@tag_args`
+ with sync functions
+ """
+ with LoggingContext("root context"):
+
+ @trace_with_opname("fixture_sync_func", tracer=self._tracer)
+ @tag_args
+ def fixture_sync_func() -> str:
+ return "foo"
+
+ result = fixture_sync_func()
+ self.assertEqual(result, "foo")
+
+ # the span should have been reported
+ self.assertEqual(
+ [span.operation_name for span in self._reporter.get_spans()],
+ ["fixture_sync_func"],
+ )
+
+ def test_trace_decorator_deferred(self) -> None:
+ """
+ Test whether we can use `@trace_with_opname` (`@trace`) and `@tag_args`
+ with functions that return deferreds
+ """
+ reactor = MemoryReactorClock()
+
+ with LoggingContext("root context"):
+
+ @trace_with_opname("fixture_deferred_func", tracer=self._tracer)
+ @tag_args
+ def fixture_deferred_func() -> "defer.Deferred[str]":
+ d1: defer.Deferred[str] = defer.Deferred()
+ d1.callback("foo")
+ return d1
+
+ result_d1 = fixture_deferred_func()
+
+ # let the tasks complete
+ reactor.pump((2,) * 8)
+
+ self.assertEqual(self.successResultOf(result_d1), "foo")
+
+ # the span should have been reported
+ self.assertEqual(
+ [span.operation_name for span in self._reporter.get_spans()],
+ ["fixture_deferred_func"],
+ )
+
+ def test_trace_decorator_async(self) -> None:
+ """
+ Test whether we can use `@trace_with_opname` (`@trace`) and `@tag_args`
+ with async functions
+ """
+ reactor = MemoryReactorClock()
+
+ with LoggingContext("root context"):
+
+ @trace_with_opname("fixture_async_func", tracer=self._tracer)
+ @tag_args
+ async def fixture_async_func() -> str:
+ return "foo"
+
+ d1 = defer.ensureDeferred(fixture_async_func())
+
+ # let the tasks complete
+ reactor.pump((2,) * 8)
+
+ self.assertEqual(self.successResultOf(d1), "foo")
+
+ # the span should have been reported
+ self.assertEqual(
+ [span.operation_name for span in self._reporter.get_spans()],
+ ["fixture_async_func"],
+ )
|
