mirror of
https://github.com/restic/restic.git
synced 2024-12-23 00:07:25 +00:00
146 lines
3.1 KiB
Go
146 lines
3.1 KiB
Go
package bloblru
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"math/rand"
|
|
"testing"
|
|
|
|
"github.com/restic/restic/internal/restic"
|
|
rtest "github.com/restic/restic/internal/test"
|
|
"golang.org/x/sync/errgroup"
|
|
)
|
|
|
|
func TestCache(t *testing.T) {
|
|
var id1, id2, id3 restic.ID
|
|
id1[0] = 1
|
|
id2[0] = 2
|
|
id3[0] = 3
|
|
|
|
const (
|
|
kiB = 1 << 10
|
|
cacheSize = 64*kiB + 3*overhead
|
|
)
|
|
|
|
c := New(cacheSize)
|
|
|
|
addAndCheck := func(id restic.ID, exp []byte) {
|
|
c.Add(id, exp)
|
|
blob, ok := c.Get(id)
|
|
rtest.Assert(t, ok, "blob %v added but not found in cache", id)
|
|
rtest.Equals(t, &exp[0], &blob[0])
|
|
rtest.Equals(t, exp, blob)
|
|
}
|
|
|
|
// Our blobs have len 1 but larger cap. The cache should check the cap,
|
|
// since it more reliably indicates the amount of memory kept alive.
|
|
addAndCheck(id1, make([]byte, 1, 32*kiB))
|
|
addAndCheck(id2, make([]byte, 1, 30*kiB))
|
|
addAndCheck(id3, make([]byte, 1, 10*kiB))
|
|
|
|
_, ok := c.Get(id2)
|
|
rtest.Assert(t, ok, "blob %v not present", id2)
|
|
_, ok = c.Get(id1)
|
|
rtest.Assert(t, !ok, "blob %v present, but should have been evicted", id1)
|
|
|
|
c.Add(id1, make([]byte, 1+c.size))
|
|
_, ok = c.Get(id1)
|
|
rtest.Assert(t, !ok, "blob %v too large but still added to cache")
|
|
|
|
c.c.Remove(id1)
|
|
c.c.Remove(id3)
|
|
c.c.Remove(id2)
|
|
|
|
rtest.Equals(t, cacheSize, c.size)
|
|
rtest.Equals(t, cacheSize, c.free)
|
|
}
|
|
|
|
func TestCacheGetOrCompute(t *testing.T) {
|
|
var id1, id2 restic.ID
|
|
id1[0] = 1
|
|
id2[0] = 2
|
|
|
|
const (
|
|
kiB = 1 << 10
|
|
cacheSize = 64*kiB + 3*overhead
|
|
)
|
|
|
|
c := New(cacheSize)
|
|
|
|
e := fmt.Errorf("broken")
|
|
_, err := c.GetOrCompute(id1, func() ([]byte, error) {
|
|
return nil, e
|
|
})
|
|
rtest.Equals(t, e, err, "expected error was not returned")
|
|
|
|
// fill buffer
|
|
data1 := make([]byte, 10*kiB)
|
|
blob, err := c.GetOrCompute(id1, func() ([]byte, error) {
|
|
return data1, nil
|
|
})
|
|
rtest.OK(t, err)
|
|
rtest.Equals(t, &data1[0], &blob[0], "wrong buffer returned")
|
|
|
|
// now the buffer should be returned without calling the compute function
|
|
blob, err = c.GetOrCompute(id1, func() ([]byte, error) {
|
|
return nil, e
|
|
})
|
|
rtest.OK(t, err)
|
|
rtest.Equals(t, &data1[0], &blob[0], "wrong buffer returned")
|
|
|
|
// check concurrency
|
|
wg, _ := errgroup.WithContext(context.TODO())
|
|
wait := make(chan struct{})
|
|
calls := make(chan struct{}, 10)
|
|
|
|
// start a bunch of blocking goroutines
|
|
for i := 0; i < 10; i++ {
|
|
wg.Go(func() error {
|
|
buf, err := c.GetOrCompute(id2, func() ([]byte, error) {
|
|
// block to ensure that multiple requests are waiting in parallel
|
|
<-wait
|
|
calls <- struct{}{}
|
|
return make([]byte, 42), nil
|
|
})
|
|
if len(buf) != 42 {
|
|
return fmt.Errorf("wrong buffer")
|
|
}
|
|
return err
|
|
})
|
|
}
|
|
|
|
close(wait)
|
|
rtest.OK(t, wg.Wait())
|
|
close(calls)
|
|
count := 0
|
|
for range calls {
|
|
count++
|
|
}
|
|
rtest.Equals(t, 1, count, "expected exactly one call of the compute function")
|
|
}
|
|
|
|
func BenchmarkAdd(b *testing.B) {
|
|
const (
|
|
MiB = 1 << 20
|
|
nblobs = 64
|
|
)
|
|
|
|
c := New(64 * MiB)
|
|
|
|
buf := make([]byte, 8*MiB)
|
|
ids := make([]restic.ID, nblobs)
|
|
sizes := make([]int, nblobs)
|
|
|
|
r := rand.New(rand.NewSource(100))
|
|
for i := range ids {
|
|
r.Read(ids[i][:])
|
|
sizes[i] = r.Intn(8 * MiB)
|
|
}
|
|
|
|
b.ResetTimer()
|
|
b.ReportAllocs()
|
|
|
|
for i := 0; i < b.N; i++ {
|
|
c.Add(ids[i%nblobs], buf[:sizes[i%nblobs]])
|
|
}
|
|
}
|