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Instrument the federation/backfill part of /messages (#13489)

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Instrument the federation/backfill part of `/messages` so it's easier to follow what's going on in Jaeger when viewing a trace.

Split out from https://github.com/matrix-org/synapse/pull/13440

Follow-up from https://github.com/matrix-org/synapse/pull/13368

Part of https://github.com/matrix-org/synapse/issues/13356
This commit is contained in:
Eric Eastwood 2022-08-16 12:39:40 -05:00 • committed by GitHub
parent 5ace5d7b15
commit 0a4efbc1dd
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11 changed files with 220 additions and 33 deletions
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19
synapse/logging/opentracing.py
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@ -310,6 +310,19 @@ class SynapseTags:
# The name of the external cache
CACHE_NAME = "cache.name"
# Used to tag function arguments
#
# Tag a named arg. The name of the argument should be appended to this prefix.
FUNC_ARG_PREFIX = "ARG."
# Tag extra variadic number of positional arguments (`def foo(first, second, *extras)`)
FUNC_ARGS = "args"
# Tag keyword args
FUNC_KWARGS = "kwargs"
# Some intermediate result that's interesting to the function. The label for
# the result should be appended to this prefix.
RESULT_PREFIX = "RESULT."
class SynapseBaggage:
FORCE_TRACING = "synapse-force-tracing"
@ -967,9 +980,9 @@ def tag_args(func: Callable[P, R]) -> Callable[P, R]:
# 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))
set_tag(SynapseTags.FUNC_ARG_PREFIX + argspec.args[i], str(arg))
set_tag(SynapseTags.FUNC_ARGS, str(args[len(argspec.args) :])) # type: ignore[index]
set_tag(SynapseTags.FUNC_KWARGS, str(kwargs))
yield
return _custom_sync_async_decorator(func, _wrapping_logic)