Reject labels with invalid runes when using implicit extraction parser. #3983
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`json` and `logfmt` parser will attempt to extract all possible keys and values as labels. But if a values currently contains the rune error (replace when there's an invalid rune) PromQL parser will fail and the request will be fully rejected. This PR removes those labels values when using those two parsers. For other parser you can just decide to not extract thoses values.( At least that's my choice for now). Unfortunatelly this comes with a small cpu overhead prices: ``` ~/go/src/github.com/grafana/loki utf8-parser* ❯ benchcmp before.txt after.txt benchmark old ns/op new ns/op delta Benchmark_Parser/json/no_labels_hints-16 3647 4210 +15.44% Benchmark_Parser/json/labels_hints-16 2210 2247 +1.67% benchmark old allocs new allocs delta Benchmark_Parser/json/no_labels_hints-16 72 72 +0.00% Benchmark_Parser/json/labels_hints-16 35 35 +0.00% benchmark old bytes new bytes delta Benchmark_Parser/json/no_labels_hints-16 1121 1121 +0.00% Benchmark_Parser/json/labels_hints-16 472 472 +0.00% ``` Fixes grafana#2859 Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>
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Should this also apply to the JSON expression parser? |
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I think because you explicitly ask to extract a set of values with this parser, it's easy to avoid those values when crafting the query. That's my main reasoning for not adding this everywhere. |
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Seems like a fair argument 👍 |
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jsonandlogfmtparser will attempt to extract all possible keys and values as labels.But if a values currently contains the rune error (used as replacement when there's an invalid rune) PromQL parser will fail and the request
will be fully rejected.
This PR removes those labels values when using those two parsers.
For other parser you can just decide to not extract these values.( At least that's my choice for now).
Unfortunately this comes with a small cpu overhead prices:
Fixes #2859
Signed-off-by: Cyril Tovena cyril.tovena@gmail.com