fix: panic on slice bounds out of range when preparing data stream #599
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Other slices may be 0 length, resulting in a panic
when running `slice[:listener.maxMetricsReturned`
```
{"level":"ERROR","timestamp":"2024-06-17T15:29:14.474Z","logger":"access","message":"rendering too many metrics","limit":10000,"target":11272}
panic: runtime error: slice bounds out of range [:10000] with capacity 0
goroutine 2919 [running]:
github.com/go-graphite/go-carbon/carbonserver.(*CarbonserverListener).prepareDataStream(0xc0000c8000, {0xf71cf8, 0xc0015b3860}, 0x2, 0xc0015b3b90?, 0xc0015b3ef0?, 0xc00c88b7a0)
/usr/local/src/go-carbon/carbonserver/render.go:425 +0xf4d
github.com/go-graphite/go-carbon/carbonserver.(*CarbonserverListener).prepareDataProto.func1()
/usr/local/src/go-carbon/carbonserver/render.go:495 +0xb3
created by github.com/go-graphite/go-carbon/carbonserver.(*CarbonserverListener).prepareDataProto
/usr/local/src/go-carbon/carbonserver/render.go:493 +0x4d5
```
deniszh
approved these changes
Jul 10, 2024
|
LGTM, merging. Thanks a lot! |
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We've been seeing fatals from go-carbon when queries pull back more than the max metrics limit. Unsure which of these values is the one being read but it seemed like guarding all of them would be the best approach.
fatal log: