diff options
Diffstat (limited to 'Godeps/_workspace/src/github.com/syndtr/gosnappy/snappy/snappy_test.go')
-rw-r--r-- | Godeps/_workspace/src/github.com/syndtr/gosnappy/snappy/snappy_test.go | 364 |
1 files changed, 364 insertions, 0 deletions
diff --git a/Godeps/_workspace/src/github.com/syndtr/gosnappy/snappy/snappy_test.go b/Godeps/_workspace/src/github.com/syndtr/gosnappy/snappy/snappy_test.go new file mode 100644 index 000000000..0623385b7 --- /dev/null +++ b/Godeps/_workspace/src/github.com/syndtr/gosnappy/snappy/snappy_test.go @@ -0,0 +1,364 @@ +// Copyright 2011 The Snappy-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package snappy + +import ( + "bytes" + "flag" + "fmt" + "io" + "io/ioutil" + "math/rand" + "net/http" + "os" + "path/filepath" + "strings" + "testing" +) + +var ( + download = flag.Bool("download", false, "If true, download any missing files before running benchmarks") + testdata = flag.String("testdata", "testdata", "Directory containing the test data") +) + +func roundtrip(b, ebuf, dbuf []byte) error { + e, err := Encode(ebuf, b) + if err != nil { + return fmt.Errorf("encoding error: %v", err) + } + d, err := Decode(dbuf, e) + if err != nil { + return fmt.Errorf("decoding error: %v", err) + } + if !bytes.Equal(b, d) { + return fmt.Errorf("roundtrip mismatch:\n\twant %v\n\tgot %v", b, d) + } + return nil +} + +func TestEmpty(t *testing.T) { + if err := roundtrip(nil, nil, nil); err != nil { + t.Fatal(err) + } +} + +func TestSmallCopy(t *testing.T) { + for _, ebuf := range [][]byte{nil, make([]byte, 20), make([]byte, 64)} { + for _, dbuf := range [][]byte{nil, make([]byte, 20), make([]byte, 64)} { + for i := 0; i < 32; i++ { + s := "aaaa" + strings.Repeat("b", i) + "aaaabbbb" + if err := roundtrip([]byte(s), ebuf, dbuf); err != nil { + t.Errorf("len(ebuf)=%d, len(dbuf)=%d, i=%d: %v", len(ebuf), len(dbuf), i, err) + } + } + } + } +} + +func TestSmallRand(t *testing.T) { + rng := rand.New(rand.NewSource(27354294)) + for n := 1; n < 20000; n += 23 { + b := make([]byte, n) + for i := range b { + b[i] = uint8(rng.Uint32()) + } + if err := roundtrip(b, nil, nil); err != nil { + t.Fatal(err) + } + } +} + +func TestSmallRegular(t *testing.T) { + for n := 1; n < 20000; n += 23 { + b := make([]byte, n) + for i := range b { + b[i] = uint8(i%10 + 'a') + } + if err := roundtrip(b, nil, nil); err != nil { + t.Fatal(err) + } + } +} + +func cmp(a, b []byte) error { + if len(a) != len(b) { + return fmt.Errorf("got %d bytes, want %d", len(a), len(b)) + } + for i := range a { + if a[i] != b[i] { + return fmt.Errorf("byte #%d: got 0x%02x, want 0x%02x", i, a[i], b[i]) + } + } + return nil +} + +func TestFramingFormat(t *testing.T) { + // src is comprised of alternating 1e5-sized sequences of random + // (incompressible) bytes and repeated (compressible) bytes. 1e5 was chosen + // because it is larger than maxUncompressedChunkLen (64k). + src := make([]byte, 1e6) + rng := rand.New(rand.NewSource(1)) + for i := 0; i < 10; i++ { + if i%2 == 0 { + for j := 0; j < 1e5; j++ { + src[1e5*i+j] = uint8(rng.Intn(256)) + } + } else { + for j := 0; j < 1e5; j++ { + src[1e5*i+j] = uint8(i) + } + } + } + + buf := new(bytes.Buffer) + if _, err := NewWriter(buf).Write(src); err != nil { + t.Fatalf("Write: encoding: %v", err) + } + dst, err := ioutil.ReadAll(NewReader(buf)) + if err != nil { + t.Fatalf("ReadAll: decoding: %v", err) + } + if err := cmp(dst, src); err != nil { + t.Fatal(err) + } +} + +func TestReaderReset(t *testing.T) { + gold := bytes.Repeat([]byte("All that is gold does not glitter,\n"), 10000) + buf := new(bytes.Buffer) + if _, err := NewWriter(buf).Write(gold); err != nil { + t.Fatalf("Write: %v", err) + } + encoded, invalid, partial := buf.String(), "invalid", "partial" + r := NewReader(nil) + for i, s := range []string{encoded, invalid, partial, encoded, partial, invalid, encoded, encoded} { + if s == partial { + r.Reset(strings.NewReader(encoded)) + if _, err := r.Read(make([]byte, 101)); err != nil { + t.Errorf("#%d: %v", i, err) + continue + } + continue + } + r.Reset(strings.NewReader(s)) + got, err := ioutil.ReadAll(r) + switch s { + case encoded: + if err != nil { + t.Errorf("#%d: %v", i, err) + continue + } + if err := cmp(got, gold); err != nil { + t.Errorf("#%d: %v", i, err) + continue + } + case invalid: + if err == nil { + t.Errorf("#%d: got nil error, want non-nil", i) + continue + } + } + } +} + +func TestWriterReset(t *testing.T) { + gold := bytes.Repeat([]byte("Not all those who wander are lost;\n"), 10000) + var gots, wants [][]byte + const n = 20 + w, failed := NewWriter(nil), false + for i := 0; i <= n; i++ { + buf := new(bytes.Buffer) + w.Reset(buf) + want := gold[:len(gold)*i/n] + if _, err := w.Write(want); err != nil { + t.Errorf("#%d: Write: %v", i, err) + failed = true + continue + } + got, err := ioutil.ReadAll(NewReader(buf)) + if err != nil { + t.Errorf("#%d: ReadAll: %v", i, err) + failed = true + continue + } + gots = append(gots, got) + wants = append(wants, want) + } + if failed { + return + } + for i := range gots { + if err := cmp(gots[i], wants[i]); err != nil { + t.Errorf("#%d: %v", i, err) + } + } +} + +func benchDecode(b *testing.B, src []byte) { + encoded, err := Encode(nil, src) + if err != nil { + b.Fatal(err) + } + // Bandwidth is in amount of uncompressed data. + b.SetBytes(int64(len(src))) + b.ResetTimer() + for i := 0; i < b.N; i++ { + Decode(src, encoded) + } +} + +func benchEncode(b *testing.B, src []byte) { + // Bandwidth is in amount of uncompressed data. + b.SetBytes(int64(len(src))) + dst := make([]byte, MaxEncodedLen(len(src))) + b.ResetTimer() + for i := 0; i < b.N; i++ { + Encode(dst, src) + } +} + +func readFile(b testing.TB, filename string) []byte { + src, err := ioutil.ReadFile(filename) + if err != nil { + b.Fatalf("failed reading %s: %s", filename, err) + } + if len(src) == 0 { + b.Fatalf("%s has zero length", filename) + } + return src +} + +// expand returns a slice of length n containing repeated copies of src. +func expand(src []byte, n int) []byte { + dst := make([]byte, n) + for x := dst; len(x) > 0; { + i := copy(x, src) + x = x[i:] + } + return dst +} + +func benchWords(b *testing.B, n int, decode bool) { + // Note: the file is OS-language dependent so the resulting values are not + // directly comparable for non-US-English OS installations. + data := expand(readFile(b, "/usr/share/dict/words"), n) + if decode { + benchDecode(b, data) + } else { + benchEncode(b, data) + } +} + +func BenchmarkWordsDecode1e3(b *testing.B) { benchWords(b, 1e3, true) } +func BenchmarkWordsDecode1e4(b *testing.B) { benchWords(b, 1e4, true) } +func BenchmarkWordsDecode1e5(b *testing.B) { benchWords(b, 1e5, true) } +func BenchmarkWordsDecode1e6(b *testing.B) { benchWords(b, 1e6, true) } +func BenchmarkWordsEncode1e3(b *testing.B) { benchWords(b, 1e3, false) } +func BenchmarkWordsEncode1e4(b *testing.B) { benchWords(b, 1e4, false) } +func BenchmarkWordsEncode1e5(b *testing.B) { benchWords(b, 1e5, false) } +func BenchmarkWordsEncode1e6(b *testing.B) { benchWords(b, 1e6, false) } + +// testFiles' values are copied directly from +// https://raw.githubusercontent.com/google/snappy/master/snappy_unittest.cc +// The label field is unused in snappy-go. +var testFiles = []struct { + label string + filename string +}{ + {"html", "html"}, + {"urls", "urls.10K"}, + {"jpg", "fireworks.jpeg"}, + {"jpg_200", "fireworks.jpeg"}, + {"pdf", "paper-100k.pdf"}, + {"html4", "html_x_4"}, + {"txt1", "alice29.txt"}, + {"txt2", "asyoulik.txt"}, + {"txt3", "lcet10.txt"}, + {"txt4", "plrabn12.txt"}, + {"pb", "geo.protodata"}, + {"gaviota", "kppkn.gtb"}, +} + +// The test data files are present at this canonical URL. +const baseURL = "https://raw.githubusercontent.com/google/snappy/master/testdata/" + +func downloadTestdata(basename string) (errRet error) { + filename := filepath.Join(*testdata, basename) + if stat, err := os.Stat(filename); err == nil && stat.Size() != 0 { + return nil + } + + if !*download { + return fmt.Errorf("test data not found; skipping benchmark without the -download flag") + } + // Download the official snappy C++ implementation reference test data + // files for benchmarking. + if err := os.Mkdir(*testdata, 0777); err != nil && !os.IsExist(err) { + return fmt.Errorf("failed to create testdata: %s", err) + } + + f, err := os.Create(filename) + if err != nil { + return fmt.Errorf("failed to create %s: %s", filename, err) + } + defer f.Close() + defer func() { + if errRet != nil { + os.Remove(filename) + } + }() + url := baseURL + basename + resp, err := http.Get(url) + if err != nil { + return fmt.Errorf("failed to download %s: %s", url, err) + } + defer resp.Body.Close() + if s := resp.StatusCode; s != http.StatusOK { + return fmt.Errorf("downloading %s: HTTP status code %d (%s)", url, s, http.StatusText(s)) + } + _, err = io.Copy(f, resp.Body) + if err != nil { + return fmt.Errorf("failed to download %s to %s: %s", url, filename, err) + } + return nil +} + +func benchFile(b *testing.B, n int, decode bool) { + if err := downloadTestdata(testFiles[n].filename); err != nil { + b.Fatalf("failed to download testdata: %s", err) + } + data := readFile(b, filepath.Join(*testdata, testFiles[n].filename)) + if decode { + benchDecode(b, data) + } else { + benchEncode(b, data) + } +} + +// Naming convention is kept similar to what snappy's C++ implementation uses. +func Benchmark_UFlat0(b *testing.B) { benchFile(b, 0, true) } +func Benchmark_UFlat1(b *testing.B) { benchFile(b, 1, true) } +func Benchmark_UFlat2(b *testing.B) { benchFile(b, 2, true) } +func Benchmark_UFlat3(b *testing.B) { benchFile(b, 3, true) } +func Benchmark_UFlat4(b *testing.B) { benchFile(b, 4, true) } +func Benchmark_UFlat5(b *testing.B) { benchFile(b, 5, true) } +func Benchmark_UFlat6(b *testing.B) { benchFile(b, 6, true) } +func Benchmark_UFlat7(b *testing.B) { benchFile(b, 7, true) } +func Benchmark_UFlat8(b *testing.B) { benchFile(b, 8, true) } +func Benchmark_UFlat9(b *testing.B) { benchFile(b, 9, true) } +func Benchmark_UFlat10(b *testing.B) { benchFile(b, 10, true) } +func Benchmark_UFlat11(b *testing.B) { benchFile(b, 11, true) } +func Benchmark_ZFlat0(b *testing.B) { benchFile(b, 0, false) } +func Benchmark_ZFlat1(b *testing.B) { benchFile(b, 1, false) } +func Benchmark_ZFlat2(b *testing.B) { benchFile(b, 2, false) } +func Benchmark_ZFlat3(b *testing.B) { benchFile(b, 3, false) } +func Benchmark_ZFlat4(b *testing.B) { benchFile(b, 4, false) } +func Benchmark_ZFlat5(b *testing.B) { benchFile(b, 5, false) } +func Benchmark_ZFlat6(b *testing.B) { benchFile(b, 6, false) } +func Benchmark_ZFlat7(b *testing.B) { benchFile(b, 7, false) } +func Benchmark_ZFlat8(b *testing.B) { benchFile(b, 8, false) } +func Benchmark_ZFlat9(b *testing.B) { benchFile(b, 9, false) } +func Benchmark_ZFlat10(b *testing.B) { benchFile(b, 10, false) } +func Benchmark_ZFlat11(b *testing.B) { benchFile(b, 11, false) } |