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Handle NameError during profiler initialization #1552

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Jun 10, 2021
Merged

Handle NameError during profiler initialization #1552

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f5776d1
Handle NameError during profiler initialization
ivoanjo Jun 9, 2021
6f2df50
Add extra TODO to clarify when the weird check can be removed
ivoanjo Jun 10, 2021
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25 changes: 25 additions & 0 deletions lib/ddtrace/configuration/components.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -73,6 +73,31 @@ def build_tracer(settings, agent_settings)
def build_profiler(settings, agent_settings)
return unless Datadog::Profiling.supported? && settings.profiling.enabled

unless defined?(Datadog::Profiling::Tasks::Setup)
# In #1545 a user reported a NameError due to this constant being uninitialized
# I've documented my suspicion on why that happened in
# https://github.com/DataDog/dd-trace-rb/issues/1545#issuecomment-856049025
#
# > Thanks for the info! It seems to feed into my theory: there's two moments in the code where we check if
# > profiler is "supported": 1) when loading ddtrace (inside preload) and 2) when starting the profile
# > after Datadog.configure gets run.
# > The problem is that the code assumes that both checks 1) and 2) will always reach the same conclusion:
# > either profiler is supported, or profiler is not supported.
# > In the problematic case, it looks like in your case check 1 decides that profiler is not
# > supported => doesn't load it, and then check 2 decides that it is => assumes it is loaded and tries to
# > start it.
#
# I was never able to validate if this was the issue or why exactly .supported? would change its mind BUT
# just in case it happens again, I've left this check which avoids breaking the user's application AND
# would instead direct them to report it to us instead, so that we can investigate what's wrong.
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Datadog.logger.error(
'Profiling was marked as supported and enabled, but setup task was not loaded properly. ' \
'Please report this at https://github.com/DataDog/dd-trace-rb/blob/master/CONTRIBUTING.md#found-a-bug'
)

return
end

# Load extensions needed to support some of the Profiling features
Datadog::Profiling::Tasks::Setup.new.run

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