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Evaluate arguments only if they are to be logged #27

merged 1 commit into from Jul 25, 2019


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This PR proposes that arguments passed as ... are only evaluated if they are to be logged.

Motivation and background

This increases performance if logs on certain levels (e.g. TRACE) require non-negligible time to produce. One practical example is logging the hashes of files being read for reconciliation purposes. Currently, if we use:

logger::log_trace("md5=", tools::md5sum(filePath))

the md5sum will be calculated regardless of the threshold, increasing runtime even if the threshold is lower than that for TRACE and nothing will be logged.

After the change, the arguments would be evaluated only if they really are to be logged and therefore are needed.

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codecov-io commented Jul 23, 2019

Codecov Report

Merging #27 into master will decrease coverage by 0.1%.
The diff coverage is 100%.

Impacted file tree graph

@@            Coverage Diff             @@
##           master      #27      +/-   ##
- Coverage   78.71%   78.61%   -0.11%     
  Files          11       11              
  Lines         357      360       +3     
+ Hits          281      283       +2     
- Misses         76       77       +1
Impacted Files Coverage Δ
R/logger.R 96.11% <100%> (-0.89%) ⬇️

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That's a good point, thanks!

But wouldn't it be easier to compare defintion$threshold with level early on even before defining log_arg and issue a next()?

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Contributor Author

Sure, would something like this be better?

R/logger.R Show resolved Hide resolved
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@daroczig daroczig merged commit 69f4c1f into daroczig:master Jul 25, 2019
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3 participants