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| 1 | +// Copyright (c) 2018-2022, Sylabs Inc. All rights reserved. |
| 2 | +// This software is licensed under a 3-clause BSD license. Please consult the |
| 3 | +// LICENSE.md file distributed with the sources of this project regarding your |
| 4 | +// rights to use or distribute this software. |
| 5 | + |
| 6 | +package client |
| 7 | + |
| 8 | +import ( |
| 9 | + "bytes" |
| 10 | + "context" |
| 11 | + "fmt" |
| 12 | + "io" |
| 13 | + "log" |
| 14 | + "net/http" |
| 15 | + "net/http/httptest" |
| 16 | + "strconv" |
| 17 | + "strings" |
| 18 | + "sync" |
| 19 | + "testing" |
| 20 | +) |
| 21 | + |
| 22 | +type inMemoryBuffer struct { |
| 23 | + m sync.Mutex |
| 24 | + buf []byte |
| 25 | +} |
| 26 | + |
| 27 | +func (f *inMemoryBuffer) WriteAt(p []byte, ofs int64) (n int, err error) { |
| 28 | + f.m.Lock() |
| 29 | + defer f.m.Unlock() |
| 30 | + |
| 31 | + n = copy(f.buf[ofs:], p) |
| 32 | + return |
| 33 | +} |
| 34 | + |
| 35 | +func (f *inMemoryBuffer) Bytes() []byte { |
| 36 | + f.m.Lock() |
| 37 | + defer f.m.Unlock() |
| 38 | + |
| 39 | + return f.buf |
| 40 | +} |
| 41 | + |
| 42 | +type stdLogger struct{} |
| 43 | + |
| 44 | +func (l *stdLogger) Log(v ...interface{}) { |
| 45 | + log.Print(v...) |
| 46 | +} |
| 47 | + |
| 48 | +func (l *stdLogger) Logf(f string, v ...interface{}) { |
| 49 | + log.Printf(f, v...) |
| 50 | +} |
| 51 | + |
| 52 | +func parseRangeHeader(t *testing.T, val string) (int64, int64) { |
| 53 | + if val == "" { |
| 54 | + return 0, 0 |
| 55 | + } |
| 56 | + |
| 57 | + var start, end int64 |
| 58 | + |
| 59 | + e := strings.SplitN(val, "=", 2) |
| 60 | + |
| 61 | + byteRange := strings.Split(e[1], "-") |
| 62 | + |
| 63 | + start, _ = strconv.ParseInt(byteRange[0], 10, 0) |
| 64 | + end, _ = strconv.ParseInt(byteRange[1], 10, 0) |
| 65 | + |
| 66 | + return start, end |
| 67 | +} |
| 68 | + |
| 69 | +const ( |
| 70 | + basicAuthUsername = "user" |
| 71 | + basicAuthPassword = "password" |
| 72 | +) |
| 73 | + |
| 74 | +var ( |
| 75 | + testLogger = &stdLogger{} |
| 76 | + creds = &basicCredentials{username: basicAuthUsername, password: basicAuthPassword} |
| 77 | +) |
| 78 | + |
| 79 | +func TestMultistreamDownloader(t *testing.T) { |
| 80 | + const src = "123456789012345678901234567890" |
| 81 | + size := int64(len(src)) |
| 82 | + |
| 83 | + defaultSpec := &Downloader{Concurrency: 10, PartSize: 3} |
| 84 | + |
| 85 | + tests := []struct { |
| 86 | + name string |
| 87 | + size int64 |
| 88 | + spec *Downloader |
| 89 | + expectErr bool |
| 90 | + }{ |
| 91 | + {"Basic", size, defaultSpec, false}, |
| 92 | + {"WithoutSize", 0, defaultSpec, true}, |
| 93 | + {"SingleStream", size, &Downloader{Concurrency: 1, PartSize: 1}, false}, |
| 94 | + {"SingleStreamWithoutSize", 0, &Downloader{Concurrency: 1, PartSize: 1}, true}, |
| 95 | + {"ManyStreams", size, &Downloader{Concurrency: uint(size), PartSize: 1}, false}, |
| 96 | + {"ManyStreamsWithoutSize", 0, &Downloader{Concurrency: uint(size), PartSize: 1}, true}, |
| 97 | + } |
| 98 | + |
| 99 | + for _, tt := range tests { |
| 100 | + tt := tt |
| 101 | + |
| 102 | + t.Run(tt.name, func(t *testing.T) { |
| 103 | + t.Parallel() |
| 104 | + |
| 105 | + // Create test http server for serving "file" |
| 106 | + srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 107 | + start, end := parseRangeHeader(t, r.Header.Get("Range")) |
| 108 | + |
| 109 | + if username, password, ok := r.BasicAuth(); ok { |
| 110 | + if got, want := username, basicAuthUsername; got != want { |
| 111 | + t.Fatalf("unexpected basic auth username: got %v, want %v", got, want) |
| 112 | + } |
| 113 | + if got, want := password, basicAuthPassword; got != want { |
| 114 | + t.Fatalf("unexpected basic auth password: got %v, want %v", got, want) |
| 115 | + } |
| 116 | + } |
| 117 | + |
| 118 | + w.Header().Set("Content-Range", fmt.Sprintf("bytes %v-%v/%v", start, end+1, size)) |
| 119 | + w.Header().Set("Content-Length", fmt.Sprintf("%v", end-start+1)) |
| 120 | + |
| 121 | + w.WriteHeader(http.StatusPartialContent) |
| 122 | + |
| 123 | + if _, err := io.Copy(w, bytes.NewReader([]byte(src[start:end+1]))); err != nil { |
| 124 | + t.Fatalf("unexpected error writing http response: %v", err) |
| 125 | + } |
| 126 | + })) |
| 127 | + defer srv.Close() |
| 128 | + |
| 129 | + c, err := NewClient(&Config{Logger: testLogger}) |
| 130 | + if err != nil { |
| 131 | + t.Fatalf("error initializing client: %v", err) |
| 132 | + } |
| 133 | + |
| 134 | + // Preallocate sink for downloaded file |
| 135 | + dst := &inMemoryBuffer{buf: make([]byte, size)} |
| 136 | + |
| 137 | + // Start download |
| 138 | + err = c.multipartDownload(context.Background(), srv.URL, creds, dst, tt.size, tt.spec, &NoopProgressBar{}) |
| 139 | + if tt.expectErr && err == nil { |
| 140 | + t.Fatal("unexpected success") |
| 141 | + } |
| 142 | + if !tt.expectErr && err != nil { |
| 143 | + t.Fatalf("unexpected error: %v", err) |
| 144 | + } |
| 145 | + if err != nil { |
| 146 | + return |
| 147 | + } |
| 148 | + |
| 149 | + // Compare results with expectations |
| 150 | + if got, want := string(dst.Bytes()), src; got != want { |
| 151 | + t.Fatalf("unexpected data: got %v, want %v", got, want) |
| 152 | + } |
| 153 | + }) |
| 154 | + } |
| 155 | +} |
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