Ensure that label values are strings in APCNg adapter #159
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added 2 commits
September 3, 2024 18:30
APCNg is crashing if the label value provided wasn't a string, but something that can be coerced to string (such as int). The problem occurs in two different places: - when a metric is emitted, the `storeLabelKeys()` calls into `addItemToKey()` which has its second parameter type hinted as a `string` and throws a type error if anything else is passed. This results in partially stored state; - when trying to scrape metrics with partially stored state, the `APCng::collect()` will try to build all the permutations and expect all the key-value pairs for labels to exist, but numeric label values aren't persisted and so it will cause the `Undefined array key` error as reported in #154; This change ensures that label values are cast to the string type before encoding them and using as APC keys. Signed-off-by: Garry Filakhtov <[email protected]>
Signed-off-by: Garry Filakhtov <[email protected]>
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Fixed the PHPStan failures. |
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Thank you! Good catch! |
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APCNg is crashing if the label value provided wasn't a string, but something that can be coerced to string (such as int). Other adaptors work properly in this situation.
The problem occurs in two different places:
storeLabelKeys()calls intoaddItemToKey()which has its second parameter type hinted as astringand throws a type error if anything else is passed. This results in partially stored state;APCng::collect()will try to build all the permutations and expect all the key-value pairs for labels to exist, but numeric label values aren't persisted and so it will cause theUndefined array keyerror as reported in APCng crashing when rendering with integer labels #154;This change ensures that label values are cast to the
stringtype before encoding them and using as APC keys.An alternative that can be considered is adding a label check / cast at the individual collector layers. Given other adaptors work properly – this solution seemed fitting. Introducing a check into the collectors layer will cause a breaking change, so probably isn't the best option.
Fixes #154