[v15] Fix: prevent race in slog text handler group handling #50506
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rosstimothy
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Closes #50450. This updates our custom slog text handler to take heavier inspiration from the slog.TextHandler. A variant of handleState used by the slog.TextHandler has been vendored and modified to produce the same output as our custom logrus formatter. Offloading formatting from the SlogTextHandler directly to handleState prevents the race caused in #50450. Additionally, some quality of life improvements were added by moving some code around to reduce file sizes and better define what belongs in a file. Benchmarks indicate that the changes here don't move the needle much. ``` goos: darwin goarch: arm64 pkg: github.com/gravitational/teleport/lib/utils/log cpu: Apple M2 Pro │ old.txt │ new.txt │ │ sec/op │ sec/op vs base │ Formatter/logrus/text-12 8.665µ ± 16% 8.187µ ± 9% ~ (p=0.280 n=10) Formatter/logrus/json-12 8.879µ ± 2% 8.820µ ± 1% ~ (p=0.089 n=10) Formatter/slog/default_text-12 3.936µ ± 3% 3.946µ ± 4% ~ (p=0.839 n=10) Formatter/slog/text-12 3.789µ ± 2% 3.431µ ± 1% -9.45% (p=0.000 n=10) Formatter/slog/default_json-12 3.005µ ± 4% 3.032µ ± 3% ~ (p=0.739 n=10) Formatter/slog/json-12 3.029µ ± 6% 3.022µ ± 1% ~ (p=0.381 n=10) geomean 4.675µ 4.557µ -2.52% │ old.txt │ new.txt │ │ B/op │ B/op vs base │ Formatter/logrus/text-12 5.936Ki ± 0% 5.936Ki ± 0% ~ (p=0.752 n=10) Formatter/logrus/json-12 6.212Ki ± 0% 6.211Ki ± 0% ~ (p=0.752 n=10) Formatter/slog/default_text-12 2.534Ki ± 0% 2.534Ki ± 0% ~ (p=1.000 n=10) ¹ Formatter/slog/text-12 2.144Ki ± 0% 2.167Ki ± 0% +1.09% (p=0.000 n=10) Formatter/slog/default_json-12 2.448Ki ± 0% 2.448Ki ± 0% ~ (p=1.000 n=10) ¹ Formatter/slog/json-12 2.318Ki ± 0% 2.318Ki ± 0% ~ (p=1.000 n=10) ¹ geomean 3.231Ki 3.236Ki +0.18% ¹ all samples are equal │ old.txt │ new.txt │ │ allocs/op │ allocs/op vs base │ Formatter/logrus/text-12 54.00 ± 0% 54.00 ± 0% ~ (p=1.000 n=10) ¹ Formatter/logrus/json-12 76.00 ± 0% 76.00 ± 0% ~ (p=1.000 n=10) ¹ Formatter/slog/default_text-12 41.00 ± 0% 41.00 ± 0% ~ (p=1.000 n=10) ¹ Formatter/slog/text-12 52.00 ± 0% 33.00 ± 0% -36.54% (p=0.000 n=10) Formatter/slog/default_json-12 41.00 ± 0% 41.00 ± 0% ~ (p=1.000 n=10) ¹ Formatter/slog/json-12 42.00 ± 0% 42.00 ± 0% ~ (p=1.000 n=10) ¹ geomean 49.70 46.07 -7.30% ¹ all samples are equal ```
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marcoandredinis
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Dec 20, 2024
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Backport #50451 to branch/v15