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https://github.com/rclone/rclone
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lib/pool: add DelayAccounting() to fix accounting when reading hashes
This commit is contained in:
Nick Craig-Wood
parent
f4b1a51af6
commit
bc986b44b2
@ -19,6 +19,8 @@ type RW struct {
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out int // offset we are reading from
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lastOffset int // size in last page
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account RWAccount // account for a read
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reads int // count how many times the data has been read
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accountOn int // only account on or after this read
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}
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var (
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@ -50,10 +52,40 @@ func (rw *RW) SetAccounting(account RWAccount) *RW {
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return rw
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}
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// DelayAccountinger enables an accounting delay
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type DelayAccountinger interface {
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// DelayAccounting makes sure the accounting function only
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// gets called on the i-th or later read of the data from this
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// point (counting from 1).
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//
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// This is useful so that we don't account initial reads of
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// the data e.g. when calculating hashes.
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//
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// Set this to 0 to account everything.
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DelayAccounting(i int)
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}
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// DelayAccounting makes sure the accounting function only gets called
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// on the i-th or later read of the data from this point (counting
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// from 1).
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//
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// This is useful so that we don't account initial reads of the data
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// e.g. when calculating hashes.
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//
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// Set this to 0 to account everything.
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func (rw *RW) DelayAccounting(i int) {
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rw.accountOn = i
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rw.reads = 0
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}
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// Returns the page and offset of i for reading.
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//
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// Ensure there are pages before calling this.
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func (rw *RW) readPage(i int) (page []byte) {
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// Count a read of the data if we read the first page
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if i == 0 {
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rw.reads++
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}
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pageNumber := i / rw.pool.bufferSize
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offset := i % rw.pool.bufferSize
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page = rw.pages[pageNumber]
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@ -69,7 +101,14 @@ func (rw *RW) accountRead(n int) error {
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if rw.account == nil {
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return nil
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}
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return rw.account(n)
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// Don't start accounting until we've reached this many reads
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//
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// rw.reads will be 1 the first time this is called
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// rw.accountOn 2 means start accounting on the 2nd read through
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if rw.reads >= rw.accountOn {
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return rw.account(n)
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}
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return nil
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}
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// Read reads up to len(p) bytes into p. It returns the number of
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@ -227,10 +266,11 @@ func (rw *RW) Size() int64 {
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// Check interfaces
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var (
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_ io.Reader = (*RW)(nil)
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_ io.ReaderFrom = (*RW)(nil)
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_ io.Writer = (*RW)(nil)
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_ io.WriterTo = (*RW)(nil)
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_ io.Seeker = (*RW)(nil)
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_ io.Closer = (*RW)(nil)
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_ io.Reader = (*RW)(nil)
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_ io.ReaderFrom = (*RW)(nil)
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_ io.Writer = (*RW)(nil)
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_ io.WriterTo = (*RW)(nil)
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_ io.Seeker = (*RW)(nil)
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_ io.Closer = (*RW)(nil)
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_ DelayAccountinger = (*RW)(nil)
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)
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@ -9,6 +9,7 @@ import (
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"github.com/rclone/rclone/lib/random"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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const blockSize = 4096
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@ -178,71 +179,164 @@ func TestRW(t *testing.T) {
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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("Account", func(t *testing.T) {
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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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t.Run("Read", func(t *testing.T) {
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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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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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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("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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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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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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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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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("ReadDelay", func(t *testing.T) {
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rw := newRW()
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defer close(rw)
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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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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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rw.SetAccounting(func(n int) error {
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return errBoom
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rewind := func() {
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_, err := rw.Seek(0, io.SeekStart)
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require.NoError(t, err)
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}
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rw.DelayAccounting(3)
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dst = make([]byte, 16)
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n, err = rw.Read(dst)
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assert.Equal(t, 10, n)
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assert.Equal(t, io.EOF, err)
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assert.Equal(t, 0, total)
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rewind()
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n, err = rw.Read(dst)
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assert.Equal(t, 10, n)
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assert.Equal(t, io.EOF, err)
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assert.Equal(t, 0, total)
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rewind()
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n, err = rw.Read(dst)
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assert.Equal(t, 10, n)
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assert.Equal(t, io.EOF, err)
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assert.Equal(t, 10, total)
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rewind()
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n, err = rw.Read(dst)
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assert.Equal(t, 10, n)
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assert.Equal(t, io.EOF, err)
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assert.Equal(t, 20, total)
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rewind()
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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("WriteToDelay", 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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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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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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rw.DelayAccounting(3)
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rewind := func() {
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_, err := rw.Seek(0, io.SeekStart)
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require.NoError(t, err)
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b.Reset()
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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, 0, 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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rewind()
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n, err = rw.WriteTo(&b)
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assert.NoError(t, err)
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assert.Equal(t, 0, 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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rewind()
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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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rewind()
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n, err = rw.WriteTo(&b)
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assert.NoError(t, err)
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assert.Equal(t, 20, 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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rewind()
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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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t.Run("ReadError", 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("WriteToError", 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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}
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@ -363,26 +457,35 @@ func TestRWBoundaryConditions(t *testing.T) {
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assert.Equal(t, int64(len(data)), nn)
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}
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type test struct {
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name string
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fn func(*RW, []byte, int)
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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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for _, write := range []test{{"Write", write}, {"ReadFrom", readFrom}} {
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t.Run(write.name, func(t *testing.T) {
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for _, read := range []test{{"Read", read}, {"WriteTo", writeTo}} {
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t.Run(read.name, func(t *testing.T) {
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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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write.fn(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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read.fn(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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})
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}
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}
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