mirror of
https://github.com/rclone/rclone.git
synced 2024-12-21 02:44:02 +08:00
27b281ef69
This converts the ChunkedReader into an interface and provides two implementations one sequential and one parallel. This can be used to improve the performance of the VFS on high bandwidth or high latency links. Fixes #4760
103 lines
2.4 KiB
Go
103 lines
2.4 KiB
Go
package chunkedreader
|
|
|
|
import (
|
|
"context"
|
|
"io"
|
|
"math/rand"
|
|
"testing"
|
|
|
|
"github.com/rclone/rclone/fstest/mockobject"
|
|
"github.com/rclone/rclone/lib/multipart"
|
|
"github.com/stretchr/testify/assert"
|
|
"github.com/stretchr/testify/require"
|
|
)
|
|
|
|
func TestParallel(t *testing.T) {
|
|
content := makeContent(t, 1024)
|
|
|
|
for _, mode := range mockobject.SeekModes {
|
|
t.Run(mode.String(), testRead(content, mode, 3))
|
|
}
|
|
}
|
|
|
|
func TestParallelErrorAfterClose(t *testing.T) {
|
|
testErrorAfterClose(t, 3)
|
|
}
|
|
|
|
func TestParallelLarge(t *testing.T) {
|
|
ctx := context.Background()
|
|
const streams = 3
|
|
const chunkSize = multipart.BufferSize
|
|
const size = (2*streams+1)*chunkSize + 255
|
|
content := makeContent(t, size)
|
|
o := mockobject.New("test.bin").WithContent(content, mockobject.SeekModeNone)
|
|
|
|
cr := New(ctx, o, chunkSize, 0, streams)
|
|
|
|
for _, test := range []struct {
|
|
name string
|
|
offset int64
|
|
seekMode int
|
|
}{
|
|
{name: "Straight", offset: 0, seekMode: -1},
|
|
{name: "Rewind", offset: 0, seekMode: io.SeekStart},
|
|
{name: "NearStart", offset: 1, seekMode: io.SeekStart},
|
|
{name: "NearEnd", offset: size - 2*chunkSize - 127, seekMode: io.SeekEnd},
|
|
} {
|
|
t.Run(test.name, func(t *testing.T) {
|
|
if test.seekMode >= 0 {
|
|
var n int64
|
|
var err error
|
|
if test.seekMode == io.SeekEnd {
|
|
n, err = cr.Seek(test.offset-size, test.seekMode)
|
|
} else {
|
|
n, err = cr.Seek(test.offset, test.seekMode)
|
|
}
|
|
require.NoError(t, err)
|
|
assert.Equal(t, test.offset, n)
|
|
}
|
|
got, err := io.ReadAll(cr)
|
|
require.NoError(t, err)
|
|
require.Equal(t, len(content[test.offset:]), len(got))
|
|
assert.Equal(t, content[test.offset:], got)
|
|
})
|
|
}
|
|
|
|
require.NoError(t, cr.Close())
|
|
|
|
t.Run("Seeky", func(t *testing.T) {
|
|
cr := New(ctx, o, chunkSize, 0, streams)
|
|
offset := 0
|
|
buf := make([]byte, 1024)
|
|
|
|
for {
|
|
// Read and check a random read
|
|
readSize := rand.Intn(1024)
|
|
readBuf := buf[:readSize]
|
|
n, err := cr.Read(readBuf)
|
|
|
|
require.Equal(t, content[offset:offset+n], readBuf[:n])
|
|
offset += n
|
|
|
|
if err == io.EOF {
|
|
assert.Equal(t, size, offset)
|
|
break
|
|
}
|
|
require.NoError(t, err)
|
|
|
|
// Now do a smaller random seek backwards
|
|
seekSize := rand.Intn(512)
|
|
if offset-seekSize < 0 {
|
|
seekSize = offset
|
|
}
|
|
nn, err := cr.Seek(-int64(seekSize), io.SeekCurrent)
|
|
offset -= seekSize
|
|
require.NoError(t, err)
|
|
assert.Equal(t, nn, int64(offset))
|
|
}
|
|
|
|
require.NoError(t, cr.Close())
|
|
})
|
|
|
|
}
|