mirror of
https://github.com/restic/restic.git
synced 2024-12-23 08:16:36 +00:00
285 lines
6.3 KiB
Go
285 lines
6.3 KiB
Go
package cache
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import (
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"bytes"
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"fmt"
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"io"
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"math/rand"
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"os"
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"runtime"
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"testing"
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"time"
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"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/fs"
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"github.com/restic/restic/internal/restic"
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"github.com/restic/restic/internal/test"
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"golang.org/x/sync/errgroup"
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)
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func generateRandomFiles(t testing.TB, tpe restic.FileType, c *Cache) restic.IDSet {
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ids := restic.NewIDSet()
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for i := 0; i < rand.Intn(15)+10; i++ {
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buf := test.Random(rand.Int(), 1<<19)
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id := restic.Hash(buf)
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h := restic.Handle{Type: tpe, Name: id.String()}
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if c.Has(h) {
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t.Errorf("index %v present before save", id)
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}
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err := c.Save(h, bytes.NewReader(buf))
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if err != nil {
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t.Fatal(err)
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}
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ids.Insert(id)
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}
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return ids
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}
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// randomID returns a random ID from s.
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func randomID(s restic.IDSet) restic.ID {
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for id := range s {
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return id
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}
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panic("set is empty")
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}
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func load(t testing.TB, c *Cache, h restic.Handle) []byte {
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rd, err := c.load(h, 0, 0)
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if err != nil {
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t.Fatal(err)
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}
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if rd == nil {
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t.Fatalf("load() returned nil reader")
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}
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buf, err := io.ReadAll(rd)
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if err != nil {
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t.Fatal(err)
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}
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if err = rd.Close(); err != nil {
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t.Fatal(err)
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}
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return buf
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}
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func listFiles(t testing.TB, c *Cache, tpe restic.FileType) restic.IDSet {
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list, err := c.list(tpe)
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if err != nil {
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t.Errorf("listing failed: %v", err)
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}
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return list
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}
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func clearFiles(t testing.TB, c *Cache, tpe restic.FileType, valid restic.IDSet) {
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if err := c.Clear(tpe, valid); err != nil {
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t.Error(err)
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}
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}
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func TestFiles(t *testing.T) {
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seed := time.Now().Unix()
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t.Logf("seed is %v", seed)
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rand.Seed(seed)
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c := TestNewCache(t)
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var tests = []restic.FileType{
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restic.SnapshotFile,
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restic.PackFile,
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restic.IndexFile,
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}
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for _, tpe := range tests {
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t.Run(tpe.String(), func(t *testing.T) {
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ids := generateRandomFiles(t, tpe, c)
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id := randomID(ids)
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h := restic.Handle{Type: tpe, Name: id.String()}
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id2 := restic.Hash(load(t, c, h))
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if !id.Equal(id2) {
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t.Errorf("wrong data returned, want %v, got %v", id.Str(), id2.Str())
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}
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if !c.Has(h) {
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t.Errorf("cache thinks index %v isn't present", id.Str())
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}
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list := listFiles(t, c, tpe)
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if !ids.Equals(list) {
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t.Errorf("wrong list of index IDs returned, want:\n %v\ngot:\n %v", ids, list)
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}
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clearFiles(t, c, tpe, restic.NewIDSet(id))
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list2 := listFiles(t, c, tpe)
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ids.Delete(id)
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want := restic.NewIDSet(id)
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if !list2.Equals(want) {
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t.Errorf("ClearIndexes removed indexes, want:\n %v\ngot:\n %v", list2, want)
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}
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clearFiles(t, c, tpe, restic.NewIDSet())
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want = restic.NewIDSet()
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list3 := listFiles(t, c, tpe)
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if !list3.Equals(want) {
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t.Errorf("ClearIndexes returned a wrong list, want:\n %v\ngot:\n %v", want, list3)
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}
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})
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}
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}
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func TestFileLoad(t *testing.T) {
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seed := time.Now().Unix()
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t.Logf("seed is %v", seed)
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rand.Seed(seed)
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c := TestNewCache(t)
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// save about 5 MiB of data in the cache
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data := test.Random(rand.Int(), 5234142)
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id := restic.ID{}
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copy(id[:], data)
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h := restic.Handle{
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Type: restic.PackFile,
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Name: id.String(),
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}
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if err := c.Save(h, bytes.NewReader(data)); err != nil {
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t.Fatalf("Save() returned error: %v", err)
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}
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var tests = []struct {
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offset int64
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length int
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}{
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{0, 0},
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{5, 0},
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{32*1024 + 5, 0},
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{0, 123},
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{0, 64*1024 + 234},
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{100, 5234142 - 100},
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}
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for _, test := range tests {
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t.Run(fmt.Sprintf("%v/%v", test.length, test.offset), func(t *testing.T) {
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rd, err := c.load(h, test.length, test.offset)
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if err != nil {
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t.Fatal(err)
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}
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buf, err := io.ReadAll(rd)
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if err != nil {
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t.Fatal(err)
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}
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if err = rd.Close(); err != nil {
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t.Fatal(err)
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}
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o := int(test.offset)
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l := test.length
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if test.length == 0 {
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l = len(data) - o
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}
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if l > len(data)-o {
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l = len(data) - o
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}
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if len(buf) != l {
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t.Fatalf("wrong number of bytes returned: want %d, got %d", l, len(buf))
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}
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if !bytes.Equal(buf, data[o:o+l]) {
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t.Fatalf("wrong data returned, want:\n %02x\ngot:\n %02x", data[o:o+16], buf[:16])
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}
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})
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}
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}
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// Simulate multiple processes writing to a cache, using goroutines.
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//
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// The possibility of sharing a cache between multiple concurrent restic
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// processes isn't guaranteed in the docs and doesn't always work on Windows, hence the
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// check on GOOS. Cache sharing is considered a "nice to have" on POSIX, for now.
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//
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// The cache first creates a temporary file and then renames it to its final name.
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// On Windows renaming internally creates a file handle with a shareMode which
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// includes FILE_SHARE_DELETE. The Go runtime opens files without FILE_SHARE_DELETE,
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// thus Open(fn) will fail until the file handle used for renaming was closed.
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// See https://devblogs.microsoft.com/oldnewthing/20211022-00/?p=105822
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// for hints on how to fix this properly.
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func TestFileSaveConcurrent(t *testing.T) {
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if runtime.GOOS == "windows" {
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t.Skip("may not work due to FILE_SHARE_DELETE issue")
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}
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const nproc = 40
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var (
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c = TestNewCache(t)
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data = test.Random(1, 10000)
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g errgroup.Group
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id restic.ID
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)
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rand.Read(id[:])
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h := restic.Handle{
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Type: restic.PackFile,
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Name: id.String(),
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}
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for i := 0; i < nproc/2; i++ {
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g.Go(func() error { return c.Save(h, bytes.NewReader(data)) })
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// Can't use load because only the main goroutine may call t.Fatal.
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g.Go(func() error {
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// The timing is hard to get right, but the main thing we want to
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// ensure is ENOENT or nil error.
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time.Sleep(time.Duration(100+rand.Intn(200)) * time.Millisecond)
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f, err := c.load(h, 0, 0)
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t.Logf("Load error: %v", err)
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switch {
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case err == nil:
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case errors.Is(err, os.ErrNotExist):
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return nil
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default:
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return err
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}
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defer func() { _ = f.Close() }()
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read, err := io.ReadAll(f)
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if err == nil && !bytes.Equal(read, data) {
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err = errors.New("mismatch between Save and Load")
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}
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return err
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})
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}
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test.OK(t, g.Wait())
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saved := load(t, c, h)
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test.Equals(t, data, saved)
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}
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func TestFileSaveAfterDamage(t *testing.T) {
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c := TestNewCache(t)
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test.OK(t, fs.RemoveAll(c.path))
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// save a few bytes of data in the cache
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data := test.Random(123456789, 42)
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id := restic.Hash(data)
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h := restic.Handle{
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Type: restic.PackFile,
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Name: id.String(),
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}
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if err := c.Save(h, bytes.NewReader(data)); err == nil {
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t.Fatal("Missing error when saving to deleted cache directory")
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}
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}
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