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io: don't allocate new error on every call to Bytes()

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It makes no sense and we're using Bytes() pretty often.
This commit is contained in:
Roman Khimov 2021-08-20 10:58:51 +03:00
parent 894cfe29be
commit b8dd284d3d
1 changed files with 4 additions and 1 deletions
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5
pkg/io/binaryBufWriter.go
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@ -5,6 +5,9 @@ import (
"errors"
)
// ErrDrained is returned on an attempt to use already drained write buffer.
var ErrDrained = errors.New("buffer already drained")
// BufBinWriter is an additional layer on top of BinWriter that
// automatically creates buffer to write into that you can get after all
// writes via Bytes().
@ -29,7 +32,7 @@ func (bw *BufBinWriter) Bytes() []byte {
if bw.Err != nil {
return nil
}
bw.Err = errors.New("buffer already drained")
bw.Err = ErrDrained
return bw.buf.Bytes()
}