github.com/minio/minio@v0.0.0-20240328213742-3f72439b8a27/internal/ioutil/discard.go (about)

     1  // Copyright (c) 2015-2023 MinIO, Inc.
     2  //
     3  // This file is part of MinIO Object Storage stack
     4  //
     5  // This program is free software: you can redistribute it and/or modify
     6  // it under the terms of the GNU Affero General Public License as published by
     7  // the Free Software Foundation, either version 3 of the License, or
     8  // (at your option) any later version.
     9  //
    10  // This program is distributed in the hope that it will be useful
    11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13  // GNU Affero General Public License for more details.
    14  //
    15  // You should have received a copy of the GNU Affero General Public License
    16  // along with this program.  If not, see <http://www.gnu.org/licenses/>.
    17  
    18  package ioutil
    19  
    20  import (
    21  	"io"
    22  )
    23  
    24  // Discard is just like io.Discard without the io.ReaderFrom compatible
    25  // implementation which is buggy on NUMA systems, we have to use a simpler
    26  // io.Writer implementation alone avoids also unnecessary buffer copies,
    27  // and as such incurred latencies.
    28  var Discard io.Writer = discard{}
    29  
    30  // discard is /dev/null for Golang.
    31  type discard struct{}
    32  
    33  func (discard) Write(p []byte) (int, error) {
    34  	return len(p), nil
    35  }
    36  
    37  // DiscardReader discarded reader
    38  func DiscardReader(r io.Reader) {
    39  	Copy(Discard, r)
    40  }