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Fix async interrupt breaking bookkeeping in a Summary #66

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Fix async interrupt breaking bookkeeping in a Summary #66

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2 changes: 1 addition & 1 deletion prometheus-client/src/Prometheus/Metric/Summary.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -79,7 +79,7 @@ summary info quantiles_ = Metric $ do

instance Observer Summary where
-- | Adds a new observation to a summary metric.
observe s v = doIO $ withMVar (reqSketch s) (`ReqSketch.insert` v)
observe s v = doIO $ withMVarMasked (reqSketch s) (\rs -> rs `ReqSketch.insert` v)
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Question: What's the motivation for adding the \rs -> rs bit?

No particular objections, just curious.

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Suggestion: Add a comment explaining why we are masking here. Something along the lines of your PR description would be great.

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+1 on adding a comment directly to the code.


-- | Retrieves a list of tuples containing a quantile and its associated value.
getSummary :: MonadIO m => Summary -> m [(Rational, Double)]
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