github.com/10XDev/rclone@v1.52.3-0.20200626220027-16af9ab76b2a/vfs/vfstest/read.go (about)

     1  package vfstest
     2  
     3  import (
     4  	"io"
     5  	"io/ioutil"
     6  	"testing"
     7  	"time"
     8  
     9  	"github.com/stretchr/testify/assert"
    10  )
    11  
    12  // TestReadByByte reads by byte including don't read any bytes
    13  func TestReadByByte(t *testing.T) {
    14  	run.skipIfNoFUSE(t)
    15  
    16  	var data = []byte("hellohello")
    17  	run.createFile(t, "testfile", string(data))
    18  	run.checkDir(t, "testfile 10")
    19  
    20  	for i := 0; i < len(data); i++ {
    21  		fd, err := run.os.Open(run.path("testfile"))
    22  		assert.NoError(t, err)
    23  		for j := 0; j < i; j++ {
    24  			buf := make([]byte, 1)
    25  			n, err := io.ReadFull(fd, buf)
    26  			assert.NoError(t, err)
    27  			assert.Equal(t, 1, n)
    28  			assert.Equal(t, buf[0], data[j])
    29  		}
    30  		err = fd.Close()
    31  		assert.NoError(t, err)
    32  	}
    33  
    34  	time.Sleep(100 * time.Millisecond) // FIXME wait for Release
    35  	run.rm(t, "testfile")
    36  }
    37  
    38  // TestReadChecksum checks the checksum reading is working
    39  func TestReadChecksum(t *testing.T) {
    40  	run.skipIfNoFUSE(t)
    41  
    42  	// create file big enough so we exceed any single FUSE read
    43  	// request
    44  	b := make([]rune, 3*128*1024)
    45  	for i := range b {
    46  		b[i] = 'r'
    47  	}
    48  	run.createFile(t, "bigfile", string(b))
    49  
    50  	// The hash comparison would fail in Flush, if we did not
    51  	// ensure we read the whole file
    52  	fd, err := run.os.Open(run.path("bigfile"))
    53  	assert.NoError(t, err)
    54  	buf := make([]byte, 10)
    55  	_, err = io.ReadFull(fd, buf)
    56  	assert.NoError(t, err)
    57  	err = fd.Close()
    58  	assert.NoError(t, err)
    59  
    60  	// The hash comparison would fail, because we only read parts
    61  	// of the file
    62  	fd, err = run.os.Open(run.path("bigfile"))
    63  	assert.NoError(t, err)
    64  	// read at start
    65  	_, err = io.ReadFull(fd, buf)
    66  	assert.NoError(t, err)
    67  	// read at end
    68  	_, err = fd.Seek(int64(len(b)-len(buf)), io.SeekStart)
    69  	assert.NoError(t, err)
    70  	_, err = io.ReadFull(fd, buf)
    71  	assert.NoError(t, err)
    72  	// ensure we don't compare hashes
    73  	err = fd.Close()
    74  	assert.NoError(t, err)
    75  
    76  	run.rm(t, "bigfile")
    77  }
    78  
    79  // TestReadSeek test seeking
    80  func TestReadSeek(t *testing.T) {
    81  	run.skipIfNoFUSE(t)
    82  
    83  	var data = []byte("helloHELLO")
    84  	run.createFile(t, "testfile", string(data))
    85  	run.checkDir(t, "testfile 10")
    86  
    87  	fd, err := run.os.Open(run.path("testfile"))
    88  	assert.NoError(t, err)
    89  
    90  	// Seek to half way
    91  	_, err = fd.Seek(5, io.SeekStart)
    92  	assert.NoError(t, err)
    93  
    94  	buf, err := ioutil.ReadAll(fd)
    95  	assert.NoError(t, err)
    96  	assert.Equal(t, buf, []byte("HELLO"))
    97  
    98  	// Test seeking to the end
    99  	_, err = fd.Seek(10, io.SeekStart)
   100  	assert.NoError(t, err)
   101  
   102  	buf, err = ioutil.ReadAll(fd)
   103  	assert.NoError(t, err)
   104  	assert.Equal(t, buf, []byte(""))
   105  
   106  	// Test seeking beyond the end
   107  	_, err = fd.Seek(1000000, io.SeekStart)
   108  	assert.NoError(t, err)
   109  
   110  	buf, err = ioutil.ReadAll(fd)
   111  	assert.NoError(t, err)
   112  	assert.Equal(t, buf, []byte(""))
   113  
   114  	// Now back to the start
   115  	_, err = fd.Seek(0, io.SeekStart)
   116  	assert.NoError(t, err)
   117  
   118  	buf, err = ioutil.ReadAll(fd)
   119  	assert.NoError(t, err)
   120  	assert.Equal(t, buf, []byte("helloHELLO"))
   121  
   122  	err = fd.Close()
   123  	assert.NoError(t, err)
   124  
   125  	run.rm(t, "testfile")
   126  }