mirror of
https://github.com/restic/restic.git
synced 2024-12-26 09:47:49 +00:00
305 lines
8.2 KiB
Go
305 lines
8.2 KiB
Go
package restorer
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import (
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"io"
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"testing"
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"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/restic"
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rtest "github.com/restic/restic/internal/test"
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)
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func assertNotOK(t *testing.T, msg string, err error) {
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rtest.Assert(t, err != nil, msg+" did not fail")
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}
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func TestBytesWriterSeeker(t *testing.T) {
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wr := &bytesWriteSeeker{data: make([]byte, 10)}
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n, err := wr.Write([]byte{1, 2})
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rtest.OK(t, err)
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rtest.Equals(t, 2, n)
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rtest.Equals(t, []byte{1, 2}, wr.data[0:2])
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n64, err := wr.Seek(0, io.SeekStart)
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rtest.OK(t, err)
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rtest.Equals(t, int64(0), n64)
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n, err = wr.Write([]byte{0, 1, 2, 3, 4})
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rtest.OK(t, err)
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rtest.Equals(t, 5, n)
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n, err = wr.Write([]byte{5, 6, 7, 8, 9})
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rtest.OK(t, err)
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rtest.Equals(t, 5, n)
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rtest.Equals(t, []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}, wr.data)
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// negative tests
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_, err = wr.Write([]byte{1})
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assertNotOK(t, "write overflow", err)
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_, err = wr.Seek(1, io.SeekStart)
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assertNotOK(t, "unsupported seek", err)
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}
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func TestPackCacheBasic(t *testing.T) {
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assertReader := func(expected []byte, offset int64, rd io.ReaderAt) {
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actual := make([]byte, len(expected))
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rd.ReadAt(actual, offset)
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rtest.Equals(t, expected, actual)
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}
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c := newPackCache(10)
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id := restic.NewRandomID()
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// load pack to the cache
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rd, err := c.get(id, 10, 5, func(offset int64, length int, wr io.WriteSeeker) error {
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rtest.Equals(t, int64(10), offset)
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rtest.Equals(t, 5, length)
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wr.Write([]byte{1, 2, 3, 4, 5})
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return nil
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})
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rtest.OK(t, err)
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assertReader([]byte{1, 2, 3, 4, 5}, 10, rd)
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// must close pack reader before can request it again
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_, err = c.get(id, 10, 5, func(offset int64, length int, wr io.WriteSeeker) error {
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t.Error("unexpected cache load call")
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return nil
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})
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assertNotOK(t, "double-reservation", err)
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// close the pack reader and get it from cache
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rd.Close()
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rd, err = c.get(id, 10, 5, func(offset int64, length int, wr io.WriteSeeker) error {
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t.Error("unexpected cache load call")
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return nil
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})
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rtest.OK(t, err)
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assertReader([]byte{1, 2, 3, 4, 5}, 10, rd)
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// close the pack reader and remove the pack from cache, assert the pack is loaded on request
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rd.Close()
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c.remove(id)
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rd, err = c.get(id, 10, 5, func(offset int64, length int, wr io.WriteSeeker) error {
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rtest.Equals(t, int64(10), offset)
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rtest.Equals(t, 5, length)
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wr.Write([]byte{1, 2, 3, 4, 5})
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return nil
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})
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rtest.OK(t, err)
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assertReader([]byte{1, 2, 3, 4, 5}, 10, rd)
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}
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func TestPackCacheInvalidRange(t *testing.T) {
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c := newPackCache(10)
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id := restic.NewRandomID()
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_, err := c.get(id, -1, 1, func(offset int64, length int, wr io.WriteSeeker) error {
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t.Error("unexpected cache load call")
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return nil
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})
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assertNotOK(t, "negative offset request", err)
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_, err = c.get(id, 0, 0, func(offset int64, length int, wr io.WriteSeeker) error {
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t.Error("unexpected cache load call")
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return nil
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})
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assertNotOK(t, "zero length request", err)
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_, err = c.get(id, 0, -1, func(offset int64, length int, wr io.WriteSeeker) error {
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t.Error("unexpected cache load call")
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return nil
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})
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assertNotOK(t, "negative length", err)
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}
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func TestPackCacheCapacity(t *testing.T) {
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c := newPackCache(10)
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id1, id2, id3 := restic.NewRandomID(), restic.NewRandomID(), restic.NewRandomID()
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// load and reserve pack1
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rd1, err := c.get(id1, 0, 5, func(offset int64, length int, wr io.WriteSeeker) error {
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wr.Write([]byte{1, 2, 3, 4, 5})
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return nil
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})
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rtest.OK(t, err)
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// load and reserve pack2
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_, err = c.get(id2, 0, 5, func(offset int64, length int, wr io.WriteSeeker) error {
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wr.Write([]byte{1, 2, 3, 4, 5})
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return nil
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})
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rtest.OK(t, err)
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// can't load pack3 because not enough space in the cache
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_, err = c.get(id3, 0, 5, func(offset int64, length int, wr io.WriteSeeker) error {
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t.Error("unexpected cache load call")
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return nil
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})
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assertNotOK(t, "request over capacity", err)
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// release pack1 and try again
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rd1.Close()
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rd3, err := c.get(id3, 0, 5, func(offset int64, length int, wr io.WriteSeeker) error {
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wr.Write([]byte{1, 2, 3, 4, 5})
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return nil
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})
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rtest.OK(t, err)
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// release pack3 and load pack1 (should not come from cache)
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rd3.Close()
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loaded := false
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rd1, err = c.get(id1, 0, 5, func(offset int64, length int, wr io.WriteSeeker) error {
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wr.Write([]byte{1, 2, 3, 4, 5})
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loaded = true
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return nil
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})
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rtest.OK(t, err)
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rtest.Equals(t, true, loaded)
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}
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func TestPackCacheDownsizeRecord(t *testing.T) {
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c := newPackCache(10)
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id := restic.NewRandomID()
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// get bigger range first
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rd, err := c.get(id, 5, 5, func(offset int64, length int, wr io.WriteSeeker) error {
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wr.Write([]byte{1, 2, 3, 4, 5})
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return nil
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})
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rtest.OK(t, err)
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rd.Close()
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// invalid "resize" requests
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_, err = c.get(id, 5, 10, func(offset int64, length int, wr io.WriteSeeker) error {
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t.Error("unexpected pack load")
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return nil
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})
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assertNotOK(t, "resize cached record", err)
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// invalid before cached range request
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_, err = c.get(id, 0, 5, func(offset int64, length int, wr io.WriteSeeker) error {
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t.Error("unexpected pack load")
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return nil
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})
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assertNotOK(t, "before cached range request", err)
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// invalid after cached range request
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_, err = c.get(id, 10, 5, func(offset int64, length int, wr io.WriteSeeker) error {
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t.Error("unexpected pack load")
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return nil
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})
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assertNotOK(t, "after cached range request", err)
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// now get smaller "nested" range
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rd, err = c.get(id, 7, 1, func(offset int64, length int, wr io.WriteSeeker) error {
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t.Error("unexpected pack load")
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return nil
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})
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rtest.OK(t, err)
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// assert expected data
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buf := make([]byte, 1)
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rd.ReadAt(buf, 7)
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rtest.Equals(t, byte(3), buf[0])
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_, err = rd.ReadAt(buf, 0)
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assertNotOK(t, "read before downsized pack range", err)
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_, err = rd.ReadAt(buf, 9)
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assertNotOK(t, "read after downsized pack range", err)
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// can't request downsized record again
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_, err = c.get(id, 7, 1, func(offset int64, length int, wr io.WriteSeeker) error {
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t.Error("unexpected pack load")
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return nil
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})
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assertNotOK(t, "double-allocation of cache record subrange", err)
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// can't request another subrange of the original record
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_, err = c.get(id, 6, 1, func(offset int64, length int, wr io.WriteSeeker) error {
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t.Error("unexpected pack load")
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return nil
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})
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assertNotOK(t, "allocation of another subrange of cache record", err)
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// release downsized record and assert the original is back in the cache
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rd.Close()
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rd, err = c.get(id, 5, 5, func(offset int64, length int, wr io.WriteSeeker) error {
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t.Error("unexpected pack load")
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return nil
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})
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rtest.OK(t, err)
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rd.Close()
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}
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func TestPackCacheFailedDownload(t *testing.T) {
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c := newPackCache(10)
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assertEmpty := func() {
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rtest.Equals(t, 0, len(c.cachedPacks))
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rtest.Equals(t, 10, c.capacity)
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rtest.Equals(t, 0, c.reservedCapacity)
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rtest.Equals(t, 0, c.allocatedCapacity)
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}
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_, err := c.get(restic.NewRandomID(), 0, 5, func(offset int64, length int, wr io.WriteSeeker) error {
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return errors.Errorf("expected induced test error")
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})
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assertNotOK(t, "not enough bytes read", err)
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assertEmpty()
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_, err = c.get(restic.NewRandomID(), 0, 5, func(offset int64, length int, wr io.WriteSeeker) error {
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wr.Write([]byte{1})
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return nil
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})
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assertNotOK(t, "not enough bytes read", err)
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assertEmpty()
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_, err = c.get(restic.NewRandomID(), 0, 5, func(offset int64, length int, wr io.WriteSeeker) error {
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wr.Write([]byte{1, 2, 3, 4, 5, 6})
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return nil
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})
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assertNotOK(t, "too many bytes read", err)
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assertEmpty()
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}
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func TestPackCacheInvalidRequests(t *testing.T) {
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c := newPackCache(10)
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id := restic.NewRandomID()
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//
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rd, _ := c.get(id, 0, 1, func(offset int64, length int, wr io.WriteSeeker) error {
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wr.Write([]byte{1})
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return nil
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})
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assertNotOK(t, "remove() reserved pack", c.remove(id))
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rtest.OK(t, rd.Close())
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assertNotOK(t, "multiple reader Close() calls)", rd.Close())
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//
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rtest.OK(t, c.remove(id))
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assertNotOK(t, "double remove() the same pack", c.remove(id))
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}
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func TestPackCacheRecord(t *testing.T) {
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rd := &packCacheRecord{
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offset: 10,
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data: []byte{1},
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}
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buf := make([]byte, 1)
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n, err := rd.ReadAt(buf, 10)
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rtest.OK(t, err)
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rtest.Equals(t, 1, n)
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rtest.Equals(t, byte(1), buf[0])
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_, err = rd.ReadAt(buf, 0)
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assertNotOK(t, "read before loaded range", err)
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_, err = rd.ReadAt(buf, 11)
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assertNotOK(t, "read after loaded range", err)
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_, err = rd.ReadAt(make([]byte, 2), 10)
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assertNotOK(t, "read more than available data", err)
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}
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