1 files changed, 156 insertions, 0 deletions
diff --git a/weed/filer/reader_at_test.go b/weed/filer/reader_at_test.go
new file mode 100644
index 000000000..d4a34cbfe
--- /dev/null
+++ b/weed/filer/reader_at_test.go
@@ -0,0 +1,156 @@
+package filer
+
+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
+}
+func (m *mockChunkCache) SetChunk(fileId string, data []byte) {
+}
+
+func TestReaderAt(t *testing.T) {
+
+	visibles := []VisibleInterval{
+		{
+			start:     1,
+			stop:      2,
+			fileId:    "1",
+			chunkSize: 9,
+		},
+		{
+			start:     3,
+			stop:      4,
+			fileId:    "3",
+			chunkSize: 1,
+		},
+		{
+			start:     5,
+			stop:      6,
+			fileId:    "5",
+			chunkSize: 2,
+		},
+		{
+			start:     7,
+			stop:      9,
+			fileId:    "7",
+			chunkSize: 2,
+		},
+		{
+			start:     9,
+			stop:      10,
+			fileId:    "9",
+			chunkSize: 2,
+		},
+	}
+
+	readerAt := &ChunkReadAt{
+		chunkViews:   ViewFromVisibleIntervals(visibles, 0, math.MaxInt64),
+		lookupFileId: nil,
+		readerLock:   sync.Mutex{},
+		fileSize:     10,
+		chunkCache:   &mockChunkCache{},
+	}
+
+	testReadAt(t, readerAt, 0, 10, 10, nil)
+	testReadAt(t, readerAt, 0, 12, 10, io.EOF)
+	testReadAt(t, readerAt, 2, 8, 8, nil)
+	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)
+
+	for _, d := range data {
+		fmt.Printf("%x", d)
+	}
+	fmt.Println()
+
+	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{
+		{
+			start:     2,
+			stop:      5,
+			fileId:    "1",
+			chunkSize: 9,
+		},
+		{
+			start:     7,
+			stop:      9,
+			fileId:    "2",
+			chunkSize: 9,
+		},
+	}
+
+	readerAt := &ChunkReadAt{
+		chunkViews:   ViewFromVisibleIntervals(visibles, 0, math.MaxInt64),
+		lookupFileId: nil,
+		readerLock:   sync.Mutex{},
+		fileSize:     10,
+		chunkCache:   &mockChunkCache{},
+	}
+
+	testReadAt(t, readerAt, 0, 10, 10, nil)
+	testReadAt(t, readerAt, 3, 16, 7, io.EOF)
+	testReadAt(t, readerAt, 3, 5, 5, nil)
+
+	testReadAt(t, readerAt, 11, 5, 0, io.EOF)
+	testReadAt(t, readerAt, 10, 5, 0, io.EOF)
+
+}
+
+func TestReaderAt1(t *testing.T) {
+
+	visibles := []VisibleInterval{
+		{
+			start:     2,
+			stop:      5,
+			fileId:    "1",
+			chunkSize: 9,
+		},
+	}
+
+	readerAt := &ChunkReadAt{
+		chunkViews:   ViewFromVisibleIntervals(visibles, 0, math.MaxInt64),
+		lookupFileId: nil,
+		readerLock:   sync.Mutex{},
+		fileSize:     20,
+		chunkCache:   &mockChunkCache{},
+	}
+
+	testReadAt(t, readerAt, 0, 20, 20, nil)
+	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)
+
+}