|
| 1 | +package randomfiles |
| 2 | + |
| 3 | +import ( |
| 4 | + "fmt" |
| 5 | + "io" |
| 6 | + "math/rand" |
| 7 | + "os" |
| 8 | + "path" |
| 9 | +) |
| 10 | + |
| 11 | +type Options struct { |
| 12 | + Out io.Writer // output progress |
| 13 | + Source io.Reader // randomness source |
| 14 | + |
| 15 | + FileSize int // the size per file. |
| 16 | + Alphabet []rune // for filenames |
| 17 | + |
| 18 | + FanoutDepth int // how deep the hierarchy goes |
| 19 | + FanoutFiles int // how many files per dir |
| 20 | + FanoutDirs int // how many dirs per dir |
| 21 | + |
| 22 | + RandomSeed int64 // use a random seed. if 0, use a random seed |
| 23 | + RandomSize bool // randomize file sizes |
| 24 | + RandomFanout bool // randomize fanout numbers |
| 25 | +} |
| 26 | + |
| 27 | +func WriteRandomFiles(root string, depth int, opts *Options) error { |
| 28 | + |
| 29 | + numfiles := opts.FanoutFiles |
| 30 | + if opts.RandomFanout { |
| 31 | + numfiles = rand.Intn(numfiles) + 1 |
| 32 | + } |
| 33 | + |
| 34 | + for i := 0; i < numfiles; i++ { |
| 35 | + if err := WriteRandomFile(root, opts); err != nil { |
| 36 | + return err |
| 37 | + } |
| 38 | + } |
| 39 | + |
| 40 | + if depth+1 <= opts.FanoutDepth { |
| 41 | + numdirs := opts.FanoutDirs |
| 42 | + if opts.RandomFanout { |
| 43 | + numdirs = rand.Intn(numdirs) + 1 |
| 44 | + } |
| 45 | + |
| 46 | + for i := 0; i < numdirs; i++ { |
| 47 | + if err := WriteRandomDir(root, depth+1, opts); err != nil { |
| 48 | + return err |
| 49 | + } |
| 50 | + } |
| 51 | + } |
| 52 | + |
| 53 | + return nil |
| 54 | +} |
| 55 | + |
| 56 | +var FilenameSize = 16 |
| 57 | +var RunesEasy = []rune("abcdefghijklmnopqrstuvwxyz01234567890-_") |
| 58 | +var RunesHard = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890!@#$%^&*()-_+= ;.,<>'\"[]{}() ") |
| 59 | + |
| 60 | +func RandomFilename(length int, alphabet []rune) string { |
| 61 | + b := make([]rune, length) |
| 62 | + for i := range b { |
| 63 | + b[i] = alphabet[rand.Intn(len(alphabet))] |
| 64 | + } |
| 65 | + return string(b) |
| 66 | +} |
| 67 | + |
| 68 | +func WriteRandomFile(root string, opts *Options) error { |
| 69 | + filesize := int64(opts.FileSize) |
| 70 | + if opts.RandomSize { |
| 71 | + filesize = rand.Int63n(filesize) + 1 |
| 72 | + } |
| 73 | + |
| 74 | + n := rand.Intn(FilenameSize-4) + 4 |
| 75 | + name := RandomFilename(n, opts.Alphabet) |
| 76 | + filepath := path.Join(root, name) |
| 77 | + f, err := os.Create(filepath) |
| 78 | + if err != nil { |
| 79 | + return err |
| 80 | + } |
| 81 | + |
| 82 | + if _, err := io.CopyN(f, opts.Source, filesize); err != nil { |
| 83 | + return err |
| 84 | + } |
| 85 | + |
| 86 | + if opts.Out != nil { |
| 87 | + fmt.Fprintln(opts.Out, filepath) |
| 88 | + } |
| 89 | + |
| 90 | + return f.Close() |
| 91 | +} |
| 92 | + |
| 93 | +func WriteRandomDir(root string, depth int, opts *Options) error { |
| 94 | + if depth > opts.FanoutDepth { |
| 95 | + return nil |
| 96 | + } |
| 97 | + |
| 98 | + n := rand.Intn(FilenameSize-4) + 4 |
| 99 | + name := RandomFilename(n, opts.Alphabet) |
| 100 | + root = path.Join(root, name) |
| 101 | + if err := os.MkdirAll(root, 0755); err != nil { |
| 102 | + return err |
| 103 | + } |
| 104 | + |
| 105 | + if opts.Out != nil { |
| 106 | + fmt.Fprintln(opts.Out, root) |
| 107 | + } |
| 108 | + |
| 109 | + return WriteRandomFiles(root, depth, opts) |
| 110 | +} |
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