sdk/go/arvadostest/manifest.go

   1 // Copyright (C) The Arvados Authors. All rights reserved.
   2 //
   3 // SPDX-License-Identifier: Apache-2.0
   4
   5 package arvadostest
   6
   7 import (
   8         "bytes"
   9         "fmt"
  10         "math/rand"
  11 )
  12
  13 func FakeManifest(dirCount, filesPerDir, blocksPerFile, interleaveChunk int) string {
  14         const blksize = 1 << 26
  15         mb := bytes.NewBuffer(make([]byte, 0, 40000000))
  16         blkid := 0
  17         for i := 0; i < dirCount; i++ {
  18                 fmt.Fprintf(mb, "./dir%d", i)
  19                 for j := 0; j < filesPerDir; j++ {
  20                         for k := 0; k < blocksPerFile; k++ {
  21                                 blkid++
  22                                 fmt.Fprintf(mb, " %032x+%d+A%040x@%08x", blkid, blksize, blkid, blkid)
  23                         }
  24                 }
  25                 for j := 0; j < filesPerDir; j++ {
  26                         if interleaveChunk == 0 {
  27                                 fmt.Fprintf(mb, " %d:%d:dir%d/file%d", (filesPerDir-j-1)*blocksPerFile*blksize, blocksPerFile*blksize, j, j)
  28                                 continue
  29                         }
  30                         for todo := int64(blocksPerFile) * int64(blksize); todo > 0; todo -= int64(interleaveChunk) {
  31                                 size := int64(interleaveChunk)
  32                                 if size > todo {
  33                                         size = todo
  34                                 }
  35                                 offset := rand.Int63n(int64(blocksPerFile)*int64(blksize)*int64(filesPerDir) - size)
  36                                 fmt.Fprintf(mb, " %d:%d:dir%d/file%d", offset, size, j, j)
  37                         }
  38                 }
  39                 mb.Write([]byte{'\n'})
  40         }
  41         return mb.String()
  42 }