seaweedfs/weed/filer/reader_at_test.go

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package filer
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import (
"fmt"
"io"
"math"
"strconv"
"sync"
"testing"
)
type mockChunkCache struct {
}
func (m *mockChunkCache) GetChunk(fileId string, minSize uint64) (data []byte) {
x, _ := strconv.Atoi(fileId)
data = make([]byte, minSize)
for i := 0; i < int(minSize); i++ {
data[i] = byte(x)
}
return data
}
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func (m *mockChunkCache) GetChunkSlice(fileId string, offset, length uint64) []byte {
return nil
}
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func (m *mockChunkCache) SetChunk(fileId string, data []byte) {
}
func TestReaderAt(t *testing.T) {
visibles := []VisibleInterval{
{
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start: 1,
stop: 2,
fileId: "1",
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chunkSize: 9,
},
{
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start: 3,
stop: 4,
fileId: "3",
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chunkSize: 1,
},
{
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start: 5,
stop: 6,
fileId: "5",
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chunkSize: 2,
},
{
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start: 7,
stop: 9,
fileId: "7",
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chunkSize: 2,
},
{
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start: 9,
stop: 10,
fileId: "9",
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chunkSize: 2,
},
}
readerAt := &ChunkReadAt{
chunkViews: ViewFromVisibleIntervals(visibles, 0, math.MaxInt64),
lookupFileId: nil,
readerLock: sync.Mutex{},
fileSize: 10,
chunkCache: &mockChunkCache{},
}
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testReadAt(t, readerAt, 0, 10, 10, io.EOF)
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testReadAt(t, readerAt, 0, 12, 10, io.EOF)
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testReadAt(t, readerAt, 2, 8, 8, io.EOF)
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testReadAt(t, readerAt, 3, 6, 6, nil)
}
func testReadAt(t *testing.T, readerAt *ChunkReadAt, offset int64, size int, expected int, expectedErr error) {
data := make([]byte, size)
n, err := readerAt.ReadAt(data, offset)
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for _, d := range data {
fmt.Printf("%x", d)
}
fmt.Println()
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if expected != n {
t.Errorf("unexpected read size: %d, expect: %d", n, expected)
}
if err != expectedErr {
t.Errorf("unexpected read error: %v, expect: %v", err, expectedErr)
}
}
func TestReaderAt0(t *testing.T) {
visibles := []VisibleInterval{
{
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start: 2,
stop: 5,
fileId: "1",
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chunkSize: 9,
},
{
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start: 7,
stop: 9,
fileId: "2",
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chunkSize: 9,
},
}
readerAt := &ChunkReadAt{
chunkViews: ViewFromVisibleIntervals(visibles, 0, math.MaxInt64),
lookupFileId: nil,
readerLock: sync.Mutex{},
fileSize: 10,
chunkCache: &mockChunkCache{},
}
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testReadAt(t, readerAt, 0, 10, 10, io.EOF)
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testReadAt(t, readerAt, 3, 16, 7, io.EOF)
testReadAt(t, readerAt, 3, 5, 5, nil)
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testReadAt(t, readerAt, 11, 5, 0, io.EOF)
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testReadAt(t, readerAt, 10, 5, 0, io.EOF)
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}
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func TestReaderAt1(t *testing.T) {
visibles := []VisibleInterval{
{
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start: 2,
stop: 5,
fileId: "1",
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chunkSize: 9,
},
}
readerAt := &ChunkReadAt{
chunkViews: ViewFromVisibleIntervals(visibles, 0, math.MaxInt64),
lookupFileId: nil,
readerLock: sync.Mutex{},
fileSize: 20,
chunkCache: &mockChunkCache{},
}
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testReadAt(t, readerAt, 0, 20, 20, io.EOF)
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testReadAt(t, readerAt, 1, 7, 7, nil)
testReadAt(t, readerAt, 0, 1, 1, nil)
testReadAt(t, readerAt, 18, 4, 2, io.EOF)
testReadAt(t, readerAt, 12, 4, 4, nil)
testReadAt(t, readerAt, 4, 20, 16, io.EOF)
testReadAt(t, readerAt, 4, 10, 10, nil)
testReadAt(t, readerAt, 1, 10, 10, nil)
}