mirror of
https://github.com/restic/restic.git
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146 lines
3.1 KiB
Go
146 lines
3.1 KiB
Go
package bloblru
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import (
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"context"
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"fmt"
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"math/rand"
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"testing"
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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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"golang.org/x/sync/errgroup"
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)
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func TestCache(t *testing.T) {
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var id1, id2, id3 restic.ID
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id1[0] = 1
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id2[0] = 2
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id3[0] = 3
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const (
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kiB = 1 << 10
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cacheSize = 64*kiB + 3*overhead
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)
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c := New(cacheSize)
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addAndCheck := func(id restic.ID, exp []byte) {
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c.Add(id, exp)
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blob, ok := c.Get(id)
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rtest.Assert(t, ok, "blob %v added but not found in cache", id)
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rtest.Equals(t, &exp[0], &blob[0])
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rtest.Equals(t, exp, blob)
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}
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// Our blobs have len 1 but larger cap. The cache should check the cap,
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// since it more reliably indicates the amount of memory kept alive.
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addAndCheck(id1, make([]byte, 1, 32*kiB))
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addAndCheck(id2, make([]byte, 1, 30*kiB))
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addAndCheck(id3, make([]byte, 1, 10*kiB))
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_, ok := c.Get(id2)
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rtest.Assert(t, ok, "blob %v not present", id2)
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_, ok = c.Get(id1)
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rtest.Assert(t, !ok, "blob %v present, but should have been evicted", id1)
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c.Add(id1, make([]byte, 1+c.size))
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_, ok = c.Get(id1)
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rtest.Assert(t, !ok, "blob %v too large but still added to cache")
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c.c.Remove(id1)
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c.c.Remove(id3)
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c.c.Remove(id2)
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rtest.Equals(t, cacheSize, c.size)
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rtest.Equals(t, cacheSize, c.free)
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}
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func TestCacheGetOrCompute(t *testing.T) {
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var id1, id2 restic.ID
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id1[0] = 1
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id2[0] = 2
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const (
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kiB = 1 << 10
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cacheSize = 64*kiB + 3*overhead
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)
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c := New(cacheSize)
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e := fmt.Errorf("broken")
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_, err := c.GetOrCompute(id1, func() ([]byte, error) {
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return nil, e
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})
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rtest.Equals(t, e, err, "expected error was not returned")
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// fill buffer
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data1 := make([]byte, 10*kiB)
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blob, err := c.GetOrCompute(id1, func() ([]byte, error) {
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return data1, nil
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})
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rtest.OK(t, err)
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rtest.Equals(t, &data1[0], &blob[0], "wrong buffer returned")
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// now the buffer should be returned without calling the compute function
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blob, err = c.GetOrCompute(id1, func() ([]byte, error) {
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return nil, e
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})
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rtest.OK(t, err)
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rtest.Equals(t, &data1[0], &blob[0], "wrong buffer returned")
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// check concurrency
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wg, _ := errgroup.WithContext(context.TODO())
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wait := make(chan struct{})
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calls := make(chan struct{}, 10)
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// start a bunch of blocking goroutines
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for i := 0; i < 10; i++ {
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wg.Go(func() error {
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buf, err := c.GetOrCompute(id2, func() ([]byte, error) {
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// block to ensure that multiple requests are waiting in parallel
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<-wait
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calls <- struct{}{}
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return make([]byte, 42), nil
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})
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if len(buf) != 42 {
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return fmt.Errorf("wrong buffer")
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}
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return err
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})
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}
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close(wait)
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rtest.OK(t, wg.Wait())
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close(calls)
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count := 0
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for range calls {
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count++
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}
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rtest.Equals(t, 1, count, "expected exactly one call of the compute function")
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}
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func BenchmarkAdd(b *testing.B) {
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const (
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MiB = 1 << 20
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nblobs = 64
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)
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c := New(64 * MiB)
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buf := make([]byte, 8*MiB)
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ids := make([]restic.ID, nblobs)
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sizes := make([]int, nblobs)
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r := rand.New(rand.NewSource(100))
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for i := range ids {
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r.Read(ids[i][:])
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sizes[i] = r.Intn(8 * MiB)
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}
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b.ResetTimer()
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b.ReportAllocs()
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for i := 0; i < b.N; i++ {
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c.Add(ids[i%nblobs], buf[:sizes[i%nblobs]])
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}
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}
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