mirror of
https://github.com/octoleo/restic.git
synced 2024-11-16 01:57:10 +00:00
324 lines
9.3 KiB
Go
324 lines
9.3 KiB
Go
package chunker_test
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import (
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"bytes"
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"crypto/md5"
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"crypto/sha256"
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"encoding/hex"
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"flag"
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"hash"
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"io"
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"io/ioutil"
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"math/rand"
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"os"
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"testing"
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"time"
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"github.com/restic/restic/chunker"
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. "github.com/restic/restic/test"
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)
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var benchmarkFile = flag.String("bench.file", "", "read from this file for benchmark")
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func parseDigest(s string) []byte {
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d, err := hex.DecodeString(s)
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if err != nil {
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panic(err)
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}
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return d
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}
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type chunk struct {
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Length uint
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CutFP uint64
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Digest []byte
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}
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// polynomial used for all the tests below
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const testPol = chunker.Pol(0x3DA3358B4DC173)
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// created for 32MB of random data out of math/rand's Uint32() seeded by
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// constant 23
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//
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// chunking configuration:
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// window size 64, avg chunksize 1<<20, min chunksize 1<<19, max chunksize 1<<23
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// polynom 0x3DA3358B4DC173
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var chunks1 = []chunk{
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chunk{2163460, 0x000b98d4cdf00000, parseDigest("4b94cb2cf293855ea43bf766731c74969b91aa6bf3c078719aabdd19860d590d")},
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chunk{643703, 0x000d4e8364d00000, parseDigest("5727a63c0964f365ab8ed2ccf604912f2ea7be29759a2b53ede4d6841e397407")},
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chunk{1528956, 0x0015a25c2ef00000, parseDigest("a73759636a1e7a2758767791c69e81b69fb49236c6929e5d1b654e06e37674ba")},
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chunk{1955808, 0x00102a8242e00000, parseDigest("c955fb059409b25f07e5ae09defbbc2aadf117c97a3724e06ad4abd2787e6824")},
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chunk{2222372, 0x00045da878000000, parseDigest("6ba5e9f7e1b310722be3627716cf469be941f7f3e39a4c3bcefea492ec31ee56")},
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chunk{2538687, 0x00198a8179900000, parseDigest("8687937412f654b5cfe4a82b08f28393a0c040f77c6f95e26742c2fc4254bfde")},
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chunk{609606, 0x001d4e8d17100000, parseDigest("5da820742ff5feb3369112938d3095785487456f65a8efc4b96dac4be7ebb259")},
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chunk{1205738, 0x000a7204dd600000, parseDigest("cc70d8fad5472beb031b1aca356bcab86c7368f40faa24fe5f8922c6c268c299")},
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chunk{959742, 0x00183e71e1400000, parseDigest("4065bdd778f95676c92b38ac265d361f81bff17d76e5d9452cf985a2ea5a4e39")},
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chunk{4036109, 0x001fec043c700000, parseDigest("b9cf166e75200eb4993fc9b6e22300a6790c75e6b0fc8f3f29b68a752d42f275")},
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chunk{1525894, 0x000b1574b1500000, parseDigest("2f238180e4ca1f7520a05f3d6059233926341090f9236ce677690c1823eccab3")},
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chunk{1352720, 0x00018965f2e00000, parseDigest("afd12f13286a3901430de816e62b85cc62468c059295ce5888b76b3af9028d84")},
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chunk{811884, 0x00155628aa100000, parseDigest("42d0cdb1ee7c48e552705d18e061abb70ae7957027db8ae8db37ec756472a70a")},
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chunk{1282314, 0x001909a0a1400000, parseDigest("819721c2457426eb4f4c7565050c44c32076a56fa9b4515a1c7796441730eb58")},
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chunk{1318021, 0x001cceb980000000, parseDigest("842eb53543db55bacac5e25cb91e43cc2e310fe5f9acc1aee86bdf5e91389374")},
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chunk{948640, 0x0011f7a470a00000, parseDigest("b8e36bf7019bb96ac3fb7867659d2167d9d3b3148c09fe0de45850b8fe577185")},
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chunk{645464, 0x00030ce2d9400000, parseDigest("5584bd27982191c3329f01ed846bfd266e96548dfa87018f745c33cfc240211d")},
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chunk{533758, 0x0004435c53c00000, parseDigest("4da778a25b72a9a0d53529eccfe2e5865a789116cb1800f470d8df685a8ab05d")},
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chunk{1128303, 0x0000c48517800000, parseDigest("08c6b0b38095b348d80300f0be4c5184d2744a17147c2cba5cc4315abf4c048f")},
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chunk{800374, 0x000968473f900000, parseDigest("820284d2c8fd243429674c996d8eb8d3450cbc32421f43113e980f516282c7bf")},
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chunk{2453512, 0x001e197c92600000, parseDigest("5fa870ed107c67704258e5e50abe67509fb73562caf77caa843b5f243425d853")},
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chunk{2651975, 0x000ae6c868000000, parseDigest("181347d2bbec32bef77ad5e9001e6af80f6abcf3576549384d334ee00c1988d8")},
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chunk{237392, 0x0000000000000001, parseDigest("fcd567f5d866357a8e299fd5b2359bb2c8157c30395229c4e9b0a353944a7978")},
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}
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// test if nullbytes are correctly split, even if length is a multiple of MinSize.
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var chunks2 = []chunk{
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chunk{chunker.MinSize, 0, parseDigest("07854d2fef297a06ba81685e660c332de36d5d18d546927d30daad6d7fda1541")},
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chunk{chunker.MinSize, 0, parseDigest("07854d2fef297a06ba81685e660c332de36d5d18d546927d30daad6d7fda1541")},
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chunk{chunker.MinSize, 0, parseDigest("07854d2fef297a06ba81685e660c332de36d5d18d546927d30daad6d7fda1541")},
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chunk{chunker.MinSize, 0, parseDigest("07854d2fef297a06ba81685e660c332de36d5d18d546927d30daad6d7fda1541")},
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}
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func testWithData(t *testing.T, chnker *chunker.Chunker, testChunks []chunk) []*chunker.Chunk {
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chunks := []*chunker.Chunk{}
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pos := uint(0)
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for i, chunk := range testChunks {
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c, err := chnker.Next()
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if err != nil {
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t.Fatalf("Error returned with chunk %d: %v", i, err)
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}
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if c == nil {
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t.Fatalf("Nil chunk returned")
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}
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if c != nil {
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if c.Start != pos {
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t.Fatalf("Start for chunk %d does not match: expected %d, got %d",
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i, pos, c.Start)
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}
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if c.Length != chunk.Length {
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t.Fatalf("Length for chunk %d does not match: expected %d, got %d",
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i, chunk.Length, c.Length)
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}
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if c.Cut != chunk.CutFP {
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t.Fatalf("Cut fingerprint for chunk %d/%d does not match: expected %016x, got %016x",
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i, len(chunks)-1, chunk.CutFP, c.Cut)
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}
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if c.Digest != nil && !bytes.Equal(c.Digest, chunk.Digest) {
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t.Fatalf("Digest fingerprint for chunk %d/%d does not match: expected %02x, got %02x",
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i, len(chunks)-1, chunk.Digest, c.Digest)
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}
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pos += c.Length
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chunks = append(chunks, c)
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}
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}
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c, err := chnker.Next()
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if c != nil {
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t.Fatal("additional non-nil chunk returned")
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}
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if err != io.EOF {
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t.Fatal("wrong error returned after last chunk")
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}
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return chunks
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}
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func getRandom(seed, count int) []byte {
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buf := make([]byte, count)
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rnd := rand.New(rand.NewSource(23))
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for i := 0; i < count; i += 4 {
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r := rnd.Uint32()
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buf[i] = byte(r)
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buf[i+1] = byte(r >> 8)
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buf[i+2] = byte(r >> 16)
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buf[i+3] = byte(r >> 24)
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}
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return buf
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}
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func TestChunker(t *testing.T) {
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// setup data source
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buf := getRandom(23, 32*1024*1024)
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ch := chunker.New(bytes.NewReader(buf), testPol, sha256.New())
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chunks := testWithData(t, ch, chunks1)
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// test reader
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for i, c := range chunks {
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rd := c.Reader(bytes.NewReader(buf))
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h := sha256.New()
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n, err := io.Copy(h, rd)
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if err != nil {
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t.Fatalf("io.Copy(): %v", err)
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}
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if uint(n) != chunks1[i].Length {
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t.Fatalf("reader returned wrong number of bytes: expected %d, got %d",
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chunks1[i].Length, n)
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}
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d := h.Sum(nil)
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if !bytes.Equal(d, chunks1[i].Digest) {
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t.Fatalf("wrong hash returned: expected %02x, got %02x",
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chunks1[i].Digest, d)
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}
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}
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// setup nullbyte data source
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buf = bytes.Repeat([]byte{0}, len(chunks2)*chunker.MinSize)
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ch = chunker.New(bytes.NewReader(buf), testPol, sha256.New())
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testWithData(t, ch, chunks2)
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}
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func TestChunkerWithRandomPolynomial(t *testing.T) {
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// setup data source
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buf := getRandom(23, 32*1024*1024)
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// generate a new random polynomial
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start := time.Now()
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p, err := chunker.RandomPolynomial()
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OK(t, err)
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t.Logf("generating random polynomial took %v", time.Since(start))
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start = time.Now()
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ch := chunker.New(bytes.NewReader(buf), p, sha256.New())
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t.Logf("creating chunker took %v", time.Since(start))
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// make sure that first chunk is different
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c, err := ch.Next()
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Assert(t, c.Cut != chunks1[0].CutFP,
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"Cut point is the same")
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Assert(t, c.Length != chunks1[0].Length,
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"Length is the same")
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Assert(t, !bytes.Equal(c.Digest, chunks1[0].Digest),
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"Digest is the same")
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}
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func TestChunkerWithoutHash(t *testing.T) {
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// setup data source
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buf := getRandom(23, 32*1024*1024)
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ch := chunker.New(bytes.NewReader(buf), testPol, nil)
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chunks := testWithData(t, ch, chunks1)
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// test reader
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for i, c := range chunks {
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rd := c.Reader(bytes.NewReader(buf))
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buf2, err := ioutil.ReadAll(rd)
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if err != nil {
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t.Fatalf("io.Copy(): %v", err)
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}
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if uint(len(buf2)) != chunks1[i].Length {
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t.Fatalf("reader returned wrong number of bytes: expected %d, got %d",
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chunks1[i].Length, uint(len(buf2)))
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}
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if uint(len(buf2)) != chunks1[i].Length {
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t.Fatalf("wrong number of bytes returned: expected %02x, got %02x",
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chunks[i].Length, len(buf2))
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}
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if !bytes.Equal(buf[c.Start:c.Start+c.Length], buf2) {
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t.Fatalf("invalid data for chunk returned: expected %02x, got %02x",
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buf[c.Start:c.Start+c.Length], buf2)
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}
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}
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// setup nullbyte data source
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buf = bytes.Repeat([]byte{0}, len(chunks2)*chunker.MinSize)
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ch = chunker.New(bytes.NewReader(buf), testPol, sha256.New())
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testWithData(t, ch, chunks2)
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}
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func benchmarkChunker(b *testing.B, hash hash.Hash) {
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var (
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rd io.ReadSeeker
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size int
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)
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if *benchmarkFile != "" {
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b.Logf("using file %q for benchmark", *benchmarkFile)
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f, err := os.Open(*benchmarkFile)
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if err != nil {
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b.Fatalf("open(%q): %v", *benchmarkFile, err)
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}
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fi, err := f.Stat()
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if err != nil {
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b.Fatalf("lstat(%q): %v", *benchmarkFile, err)
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}
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size = int(fi.Size())
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rd = f
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} else {
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size = 10 * 1024 * 1024
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rd = bytes.NewReader(getRandom(23, size))
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}
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b.ResetTimer()
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b.SetBytes(int64(size))
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var chunks int
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for i := 0; i < b.N; i++ {
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chunks = 0
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rd.Seek(0, 0)
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ch := chunker.New(rd, testPol, hash)
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for {
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_, err := ch.Next()
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if err == io.EOF {
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break
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}
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if err != nil {
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b.Fatalf("Unexpected error occurred: %v", err)
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}
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chunks++
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}
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}
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b.Logf("%d chunks, average chunk size: %d bytes", chunks, size/chunks)
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}
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func BenchmarkChunkerWithSHA256(b *testing.B) {
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benchmarkChunker(b, sha256.New())
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}
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func BenchmarkChunkerWithMD5(b *testing.B) {
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benchmarkChunker(b, md5.New())
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}
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func BenchmarkChunker(b *testing.B) {
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benchmarkChunker(b, nil)
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}
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func BenchmarkNewChunker(b *testing.B) {
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p, err := chunker.RandomPolynomial()
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OK(b, err)
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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chunker.New(bytes.NewBuffer(nil), p, nil)
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}
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}
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