388 lines
8.5 KiB
Go
388 lines
8.5 KiB
Go
package pool
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import (
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"bytes"
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"errors"
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"io"
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"testing"
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"time"
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"github.com/rclone/rclone/lib/random"
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"github.com/stretchr/testify/assert"
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)
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const blockSize = 4096
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var rwPool = New(60*time.Second, blockSize, 2, false)
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// A writer that always returns an error
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type testWriterError struct{}
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var errWriteError = errors.New("write error")
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func (testWriterError) Write(p []byte) (n int, err error) {
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return 0, errWriteError
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}
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func TestRW(t *testing.T) {
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var dst []byte
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var pos int64
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var err error
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var n int
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testData := []byte("Goodness!!") // 10 bytes long
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newRW := func() *RW {
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rw := NewRW(rwPool)
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buf := bytes.NewBuffer(testData)
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nn, err := rw.ReadFrom(buf) // fill up with goodness
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assert.NoError(t, err)
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assert.Equal(t, int64(10), nn)
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assert.Equal(t, int64(10), rw.Size())
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return rw
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}
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close := func(rw *RW) {
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assert.NoError(t, rw.Close())
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}
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t.Run("Empty", func(t *testing.T) {
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// Test empty read
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rw := NewRW(rwPool)
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defer close(rw)
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assert.Equal(t, int64(0), rw.Size())
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dst = make([]byte, 10)
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n, err = rw.Read(dst)
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assert.Equal(t, io.EOF, err)
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assert.Equal(t, 0, n)
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assert.Equal(t, int64(0), rw.Size())
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})
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t.Run("Full", func(t *testing.T) {
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rw := newRW()
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defer close(rw)
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// Test full read
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dst = make([]byte, 100)
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n, err = rw.Read(dst)
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assert.Equal(t, io.EOF, err)
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assert.Equal(t, 10, n)
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assert.Equal(t, testData, dst[0:10])
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// Test read EOF
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n, err = rw.Read(dst)
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assert.Equal(t, io.EOF, err)
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assert.Equal(t, 0, n)
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// Test Seek Back to start
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dst = make([]byte, 10)
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pos, err = rw.Seek(0, io.SeekStart)
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assert.Nil(t, err)
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assert.Equal(t, 0, int(pos))
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// Now full read
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n, err = rw.Read(dst)
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assert.Nil(t, err)
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assert.Equal(t, 10, n)
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assert.Equal(t, testData, dst)
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})
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t.Run("WriteTo", func(t *testing.T) {
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rw := newRW()
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defer close(rw)
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var b bytes.Buffer
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n, err := rw.WriteTo(&b)
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assert.NoError(t, err)
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assert.Equal(t, int64(10), n)
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assert.Equal(t, testData, b.Bytes())
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})
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t.Run("WriteToError", func(t *testing.T) {
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rw := newRW()
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defer close(rw)
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w := testWriterError{}
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n, err := rw.WriteTo(w)
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assert.Equal(t, errWriteError, err)
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assert.Equal(t, int64(0), n)
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})
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t.Run("Partial", func(t *testing.T) {
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// Test partial read
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rw := newRW()
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defer close(rw)
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dst = make([]byte, 5)
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n, err = rw.Read(dst)
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assert.Nil(t, err)
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assert.Equal(t, 5, n)
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assert.Equal(t, testData[0:5], dst)
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n, err = rw.Read(dst)
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assert.Nil(t, err)
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assert.Equal(t, 5, n)
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assert.Equal(t, testData[5:], dst)
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})
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t.Run("Seek", func(t *testing.T) {
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// Test Seek
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rw := newRW()
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defer close(rw)
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// Seek to end
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pos, err = rw.Seek(10, io.SeekStart)
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assert.NoError(t, err)
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assert.Equal(t, int64(10), pos)
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// Seek to start
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pos, err = rw.Seek(0, io.SeekStart)
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assert.NoError(t, err)
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assert.Equal(t, int64(0), pos)
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// Should not allow seek past cache index
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pos, err = rw.Seek(11, io.SeekCurrent)
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assert.Equal(t, errSeekPastEnd, err)
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assert.Equal(t, 10, int(pos))
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// Should not allow seek to negative position start
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pos, err = rw.Seek(-1, io.SeekCurrent)
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assert.Equal(t, errNegativeSeek, err)
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assert.Equal(t, 0, int(pos))
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// Should not allow seek with invalid whence
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pos, err = rw.Seek(0, 3)
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assert.Equal(t, errInvalidWhence, err)
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assert.Equal(t, 0, int(pos))
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// Should seek from index with io.SeekCurrent(1) whence
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dst = make([]byte, 5)
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_, _ = rw.Read(dst)
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pos, err = rw.Seek(-3, io.SeekCurrent)
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assert.Nil(t, err)
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assert.Equal(t, 2, int(pos))
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pos, err = rw.Seek(1, io.SeekCurrent)
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assert.Nil(t, err)
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assert.Equal(t, 3, int(pos))
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// Should seek from cache end with io.SeekEnd(2) whence
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pos, err = rw.Seek(-3, io.SeekEnd)
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assert.Nil(t, err)
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assert.Equal(t, 7, int(pos))
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// Should read from seek position and past it
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dst = make([]byte, 3)
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n, err = io.ReadFull(rw, dst)
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assert.Nil(t, err)
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assert.Equal(t, 3, n)
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assert.Equal(t, testData[7:10], dst)
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})
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errBoom := errors.New("accounting error")
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t.Run("AccountRead", func(t *testing.T) {
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// Test accounting errors
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rw := newRW()
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defer close(rw)
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var total int
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rw.SetAccounting(func(n int) error {
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total += n
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return nil
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})
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dst = make([]byte, 3)
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n, err = rw.Read(dst)
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assert.Equal(t, 3, n)
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assert.NoError(t, err)
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assert.Equal(t, 3, total)
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})
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t.Run("AccountWriteTo", func(t *testing.T) {
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rw := newRW()
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defer close(rw)
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var b bytes.Buffer
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var total int
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rw.SetAccounting(func(n int) error {
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total += n
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return nil
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})
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n, err := rw.WriteTo(&b)
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assert.NoError(t, err)
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assert.Equal(t, 10, total)
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assert.Equal(t, int64(10), n)
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assert.Equal(t, testData, b.Bytes())
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})
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t.Run("AccountReadError", func(t *testing.T) {
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// Test accounting errors
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rw := newRW()
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defer close(rw)
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rw.SetAccounting(func(n int) error {
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return errBoom
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})
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dst = make([]byte, 3)
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n, err = rw.Read(dst)
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assert.Equal(t, 3, n)
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assert.Equal(t, errBoom, err)
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})
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t.Run("AccountWriteToError", func(t *testing.T) {
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rw := newRW()
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defer close(rw)
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rw.SetAccounting(func(n int) error {
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return errBoom
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})
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var b bytes.Buffer
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n, err := rw.WriteTo(&b)
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assert.Equal(t, errBoom, err)
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assert.Equal(t, int64(10), n)
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assert.Equal(t, testData, b.Bytes())
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})
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}
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// A reader to read in chunkSize chunks
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type testReader struct {
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data []byte
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chunkSize int
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}
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// Read in chunkSize chunks
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func (r *testReader) Read(p []byte) (n int, err error) {
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if len(r.data) == 0 {
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return 0, io.EOF
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}
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chunkSize := r.chunkSize
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if chunkSize > len(r.data) {
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chunkSize = len(r.data)
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}
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n = copy(p, r.data[:chunkSize])
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r.data = r.data[n:]
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return n, nil
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}
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// A writer to write in chunkSize chunks
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type testWriter struct {
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t *testing.T
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data []byte
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chunkSize int
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buf []byte
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offset int
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}
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// Write in chunkSize chunks
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func (w *testWriter) Write(p []byte) (n int, err error) {
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if w.buf == nil {
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w.buf = make([]byte, w.chunkSize)
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}
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n = copy(w.buf, p)
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assert.Equal(w.t, w.data[w.offset:w.offset+n], w.buf[:n])
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w.offset += n
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return n, nil
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}
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func TestRWBoundaryConditions(t *testing.T) {
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var accounted int
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account := func(n int) error {
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accounted += n
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return nil
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}
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maxSize := 3 * blockSize
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buf := []byte(random.String(maxSize))
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sizes := []int{
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1, 2, 3,
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blockSize - 2, blockSize - 1, blockSize, blockSize + 1, blockSize + 2,
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2*blockSize - 2, 2*blockSize - 1, 2 * blockSize, 2*blockSize + 1, 2*blockSize + 2,
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3*blockSize - 2, 3*blockSize - 1, 3 * blockSize,
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}
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// Write the data in chunkSize chunks
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write := func(rw *RW, data []byte, chunkSize int) {
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writeData := data
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for len(writeData) > 0 {
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i := chunkSize
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if i > len(writeData) {
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i = len(writeData)
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}
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nn, err := rw.Write(writeData[:i])
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assert.NoError(t, err)
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assert.Equal(t, len(writeData[:i]), nn)
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writeData = writeData[nn:]
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}
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}
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// Write the data in chunkSize chunks using ReadFrom
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readFrom := func(rw *RW, data []byte, chunkSize int) {
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nn, err := rw.ReadFrom(&testReader{
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data: data,
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chunkSize: chunkSize,
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})
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assert.NoError(t, err)
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assert.Equal(t, int64(len(data)), nn)
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}
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// Read the data back and check it is OK in chunkSize chunks
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read := func(rw *RW, data []byte, chunkSize int) {
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size := len(data)
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buf := make([]byte, chunkSize)
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offset := 0
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for {
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nn, err := rw.Read(buf)
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expectedRead := len(buf)
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if offset+chunkSize > size {
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expectedRead = size - offset
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assert.Equal(t, err, io.EOF)
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} else {
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assert.NoError(t, err)
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}
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assert.Equal(t, expectedRead, nn)
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assert.Equal(t, data[offset:offset+nn], buf[:nn])
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offset += nn
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if err == io.EOF {
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break
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}
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}
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}
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// Read the data back and check it is OK in chunkSize chunks using WriteTo
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writeTo := func(rw *RW, data []byte, chunkSize int) {
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nn, err := rw.WriteTo(&testWriter{
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t: t,
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data: data,
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chunkSize: chunkSize,
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})
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assert.NoError(t, err)
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assert.Equal(t, int64(len(data)), nn)
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}
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// Read and Write the data with a range of block sizes and functions
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for _, writeFn := range []func(*RW, []byte, int){write, readFrom} {
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for _, readFn := range []func(*RW, []byte, int){read, writeTo} {
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for _, size := range sizes {
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data := buf[:size]
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for _, chunkSize := range sizes {
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//t.Logf("Testing size=%d chunkSize=%d", useWrite, size, chunkSize)
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rw := NewRW(rwPool)
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assert.Equal(t, int64(0), rw.Size())
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accounted = 0
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rw.SetAccounting(account)
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assert.Equal(t, 0, accounted)
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writeFn(rw, data, chunkSize)
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assert.Equal(t, int64(size), rw.Size())
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assert.Equal(t, 0, accounted)
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readFn(rw, data, chunkSize)
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assert.NoError(t, rw.Close())
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assert.Equal(t, size, accounted)
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}
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}
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}
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}
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}
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