restic/archiver_test.go

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package restic_test
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import (
"bytes"
"flag"
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"io"
"math/rand"
"testing"
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"github.com/restic/restic"
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"github.com/restic/restic/backend"
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"github.com/restic/restic/chunker"
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)
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var benchArchiveDirectory = flag.String("test.benchdir", "", "benchmark archiving a real directory")
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func get_random(seed, count int) []byte {
buf := make([]byte, count)
rnd := rand.New(rand.NewSource(int64(seed)))
for i := 0; i < count; i++ {
buf[i] = byte(rnd.Uint32())
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}
return buf
}
func randomReader(seed, size int) *bytes.Reader {
return bytes.NewReader(get_random(seed, size))
}
const bufSize = chunker.MiB
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type Rdr interface {
io.ReadSeeker
io.ReaderAt
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}
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func benchmarkChunkEncrypt(b testing.TB, buf []byte, rd Rdr, key *restic.Key) {
ch := restic.GetChunker("BenchmarkChunkEncrypt")
rd.Seek(0, 0)
ch.Reset(rd)
for {
chunk, err := ch.Next()
if err == io.EOF {
break
}
ok(b, err)
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// reduce length of buf
buf = buf[:chunk.Length]
n, err := io.ReadFull(chunk.Reader(rd), buf)
ok(b, err)
assert(b, uint(n) == chunk.Length, "invalid length: got %d, expected %d", n, chunk.Length)
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_, err = key.Encrypt(buf, buf)
ok(b, err)
}
restic.FreeChunker("BenchmarkChunkEncrypt", ch)
}
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func BenchmarkChunkEncrypt(b *testing.B) {
data := get_random(23, 10<<20) // 10MiB
rd := bytes.NewReader(data)
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be := setupBackend(b)
defer teardownBackend(b, be)
key := setupKey(b, be, "geheim")
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buf := restic.GetChunkBuf("BenchmarkChunkEncrypt")
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b.ResetTimer()
b.SetBytes(int64(len(data)))
for i := 0; i < b.N; i++ {
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benchmarkChunkEncrypt(b, buf, rd, key)
}
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restic.FreeChunkBuf("BenchmarkChunkEncrypt", buf)
}
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func benchmarkChunkEncryptP(b *testing.PB, buf []byte, rd Rdr, key *restic.Key) {
ch := restic.GetChunker("BenchmarkChunkEncryptP")
rd.Seek(0, 0)
ch.Reset(rd)
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for {
chunk, err := ch.Next()
if err == io.EOF {
break
}
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// reduce length of chunkBuf
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buf = buf[:chunk.Length]
io.ReadFull(chunk.Reader(rd), buf)
key.Encrypt(buf, buf)
}
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restic.FreeChunker("BenchmarkChunkEncryptP", ch)
}
func BenchmarkChunkEncryptParallel(b *testing.B) {
be := setupBackend(b)
defer teardownBackend(b, be)
key := setupKey(b, be, "geheim")
data := get_random(23, 10<<20) // 10MiB
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buf := restic.GetChunkBuf("BenchmarkChunkEncryptParallel")
b.ResetTimer()
b.SetBytes(int64(len(data)))
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
rd := bytes.NewReader(data)
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benchmarkChunkEncryptP(pb, buf, rd, key)
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}
})
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restic.FreeChunkBuf("BenchmarkChunkEncryptParallel", buf)
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}
func BenchmarkArchiveDirectory(b *testing.B) {
if *benchArchiveDirectory == "" {
b.Skip("benchdir not set, skipping BenchmarkArchiveDirectory")
}
be := setupBackend(b)
defer teardownBackend(b, be)
key := setupKey(b, be, "geheim")
server := restic.NewServerWithKey(be, key)
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arch, err := restic.NewArchiver(server)
ok(b, err)
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_, id, err := arch.Snapshot(nil, *benchArchiveDirectory, nil)
b.Logf("snapshot archived as %v", id)
}
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func snapshot(t testing.TB, server restic.Server, path string) *restic.Snapshot {
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arch, err := restic.NewArchiver(server)
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ok(t, err)
ok(t, arch.Preload())
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sn, _, err := arch.Snapshot(nil, path, nil)
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ok(t, err)
return sn
}
func countBlobs(t testing.TB, server restic.Server) int {
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blobs := 0
err := server.EachID(backend.Tree, func(id backend.ID) {
tree, err := restic.LoadTree(server, id)
ok(t, err)
blobs += tree.Map.Len()
})
ok(t, err)
return blobs
}
func archiveWithPreload(t testing.TB) {
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if *benchArchiveDirectory == "" {
t.Skip("benchdir not set, skipping TestArchiverPreload")
}
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be := setupBackend(t)
defer teardownBackend(t, be)
key := setupKey(t, be, "geheim")
server := restic.NewServerWithKey(be, key)
// archive a few files
sn := snapshot(t, server, *benchArchiveDirectory)
t.Logf("archived snapshot %v", sn.ID())
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// get archive stats
blobsBefore := countBlobs(t, server)
t.Logf("found %v blobs", blobsBefore)
// archive the same files again
sn2 := snapshot(t, server, *benchArchiveDirectory)
t.Logf("archived snapshot %v", sn2.ID())
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// get archive stats
blobsAfter := countBlobs(t, server)
t.Logf("found %v blobs", blobsAfter)
// if there are more than 50% more blobs, something is wrong
if blobsAfter > (blobsBefore + blobsBefore/2) {
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t.Fatalf("TestArchiverPreload: too many blobs in repository: before %d, after %d, threshhold %d",
blobsBefore, blobsAfter, (blobsBefore + blobsBefore/2))
}
}
func TestArchivePreload(t *testing.T) {
archiveWithPreload(t)
}
func BenchmarkArchivePreload(b *testing.B) {
archiveWithPreload(b)
}
func BenchmarkPreload(t *testing.B) {
if *benchArchiveDirectory == "" {
t.Skip("benchdir not set, skipping TestArchiverPreload")
}
be := setupBackend(t)
defer teardownBackend(t, be)
key := setupKey(t, be, "geheim")
server := restic.NewServerWithKey(be, key)
// archive a few files
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arch, err := restic.NewArchiver(server)
ok(t, err)
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sn, _, err := arch.Snapshot(nil, *benchArchiveDirectory, nil)
ok(t, err)
t.Logf("archived snapshot %v", sn.ID())
// start benchmark
t.ResetTimer()
for i := 0; i < t.N; i++ {
// create new archiver and preload
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arch2, err := restic.NewArchiver(server)
ok(t, err)
ok(t, arch2.Preload())
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}
}