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Fix @tag_args being off-by-one (ahead) #13452

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1 change: 1 addition & 0 deletions changelog.d/13452.misc
Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Fix `@tag_args` being off-by-one with the arguments when tagging a span (tracing).
15 changes: 13 additions & 2 deletions synapse/logging/opentracing.py
Original file line number Diff line number Diff line change
Expand Up @@ -901,6 +901,11 @@ 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.

Args:
func: `func` is assumed to be a method taking a `self` parameter, or a
`classmethod` taking a `cls` parameter. In either case, a tag is not
created for this parameter.
"""

if not opentracing:
Expand All @@ -909,8 +914,14 @@ def tag_args(func: Callable[P, R]) -> Callable[P, R]:
@wraps(func)
def _tag_args_inner(*args: P.args, **kwargs: P.kwargs) -> R:
argspec = inspect.getfullargspec(func)
for i, arg in enumerate(argspec.args[1:]):
set_tag("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 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]
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set_tag("kwargs", str(kwargs))
return func(*args, **kwargs)
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