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compress.go
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/
compress.go
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package encoding
import (
"fmt"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/encoding/zstd"
"github.com/VictoriaMetrics/metrics"
)
// CompressZSTDLevel appends compressed src to dst and returns
// the appended dst.
//
// The given compressLevel is used for the compression.
func CompressZSTDLevel(dst, src []byte, compressLevel int) []byte {
compressCalls.Inc()
originalBytes.Add(len(src))
dstLen := len(dst)
dst = zstd.CompressLevel(dst, src, compressLevel)
compressedBytes.Add(len(dst) - dstLen)
return dst
}
// DecompressZSTD decompresses src, appends the result to dst and returns
// the appended dst.
func DecompressZSTD(dst, src []byte) ([]byte, error) {
decompressCalls.Inc()
b, err := zstd.Decompress(dst, src)
if err != nil {
return b, fmt.Errorf("cannot decompress zstd block with len=%d to a buffer with len=%d: %w; block data (hex): %X", len(src), len(dst), err, src)
}
return b, nil
}
var (
compressCalls = metrics.NewCounter(`vm_zstd_block_compress_calls_total`)
decompressCalls = metrics.NewCounter(`vm_zstd_block_decompress_calls_total`)
originalBytes = metrics.NewCounter(`vm_zstd_block_original_bytes_total`)
compressedBytes = metrics.NewCounter(`vm_zstd_block_compressed_bytes_total`)
)