github.com/m3db/m3@v1.5.1-0.20231129193456-75a402aa583b/src/m3em/os/fs/file_reader_iter_test.go (about)

     1  // Copyright (c) 2017 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package fs
    22  
    23  import (
    24  	"os"
    25  	"testing"
    26  
    27  	"github.com/m3db/m3/src/m3em/checksum"
    28  
    29  	"github.com/stretchr/testify/require"
    30  )
    31  
    32  func TestIterChecksumLargeBuffer(t *testing.T) {
    33  	var (
    34  		content = []byte("temporary file content")
    35  		tmpdir  = newTempDir(t)
    36  		tmpfile = newTempFile(t, tmpdir, content)
    37  	)
    38  	defer os.RemoveAll(tmpdir) // clean up
    39  
    40  	largeBufferSize := 100
    41  	iter, err := NewSizedFileReaderIter(tmpfile.Name(), largeBufferSize)
    42  	require.NoError(t, err)
    43  	var returnedBytes []byte
    44  	numIter := 0
    45  	for iter.Next() {
    46  		returnedBytes = append(returnedBytes, iter.Current()...)
    47  		numIter++
    48  	}
    49  	require.Equal(t, 2, numIter) // once for all the data, once for returning done
    50  	require.NoError(t, iter.Err())
    51  	require.Equal(t, content, returnedBytes)
    52  	require.Equal(t, checksum.Fn(content), iter.Checksum())
    53  	require.Nil(t, iter.(*bufferedFileReaderIter).fileHandle)
    54  }
    55  
    56  func TestIterChecksumSmallBuffer(t *testing.T) {
    57  	var (
    58  		content = []byte("temporary file content")
    59  		tmpdir  = newTempDir(t)
    60  		tmpfile = newTempFile(t, tmpdir, content)
    61  	)
    62  	defer os.RemoveAll(tmpdir)
    63  
    64  	largeBufferSize := 1
    65  	iter, err := NewSizedFileReaderIter(tmpfile.Name(), largeBufferSize)
    66  	require.NoError(t, err)
    67  	numIter := 0
    68  	var returnedBytes []byte
    69  	for iter.Next() {
    70  		returnedBytes = append(returnedBytes, iter.Current()...)
    71  		numIter++
    72  	}
    73  	numExpectedIter := 1 + len(content) // one for each byte, plus one to return done
    74  	require.Equal(t, numExpectedIter, numIter)
    75  	require.NoError(t, iter.Err())
    76  	require.Equal(t, content, returnedBytes)
    77  	require.Equal(t, checksum.Fn(content), iter.Checksum())
    78  	require.Nil(t, iter.(*bufferedFileReaderIter).fileHandle)
    79  }