sdk/go/keepclient/collectionreader_test.go

   1 // Copyright (C) The Arvados Authors. All rights reserved.
   2 //
   3 // SPDX-License-Identifier: Apache-2.0
   4
   5 package keepclient
   6
   7 import (
   8         "crypto/md5"
   9         "fmt"
  10         "io"
  11         "io/ioutil"
  12         "math/rand"
  13         "net/http"
  14         "os"
  15         "strconv"
  16         "strings"
  17
  18         "git.arvados.org/arvados.git/sdk/go/arvadosclient"
  19         "git.arvados.org/arvados.git/sdk/go/arvadostest"
  20         check "gopkg.in/check.v1"
  21 )
  22
  23 var _ = check.Suite(&CollectionReaderUnit{})
  24
  25 type CollectionReaderUnit struct {
  26         arv     *arvadosclient.ArvadosClient
  27         kc      *KeepClient
  28         handler SuccessHandler
  29 }
  30
  31 func (s *CollectionReaderUnit) SetUpTest(c *check.C) {
  32         var err error
  33         s.arv, err = arvadosclient.MakeArvadosClient()
  34         c.Assert(err, check.IsNil)
  35         s.arv.ApiToken = arvadostest.ActiveToken
  36
  37         s.kc, err = MakeKeepClient(s.arv)
  38         c.Assert(err, check.IsNil)
  39
  40         s.handler = SuccessHandler{
  41                 disk: make(map[string][]byte),
  42                 lock: make(chan struct{}, 1),
  43                 ops:  new(int),
  44         }
  45         localRoots := make(map[string]string)
  46         for i, k := range RunSomeFakeKeepServers(s.handler, 4) {
  47                 localRoots[fmt.Sprintf("zzzzz-bi6l4-fakefakefake%03d", i)] = k.url
  48         }
  49         s.kc.SetServiceRoots(localRoots, localRoots, nil)
  50 }
  51
  52 type SuccessHandler struct {
  53         disk map[string][]byte
  54         lock chan struct{} // channel with buffer==1: full when an operation is in progress.
  55         ops  *int          // number of operations completed
  56 }
  57
  58 func (h SuccessHandler) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
  59         switch req.Method {
  60         case "PUT":
  61                 buf, err := ioutil.ReadAll(req.Body)
  62                 if err != nil {
  63                         resp.WriteHeader(500)
  64                         return
  65                 }
  66                 pdh := fmt.Sprintf("%x+%d", md5.Sum(buf), len(buf))
  67                 h.lock <- struct{}{}
  68                 h.disk[pdh] = buf
  69                 if h.ops != nil {
  70                         (*h.ops)++
  71                 }
  72                 <-h.lock
  73                 resp.Write([]byte(pdh))
  74         case "GET":
  75                 pdh := req.URL.Path[1:]
  76                 h.lock <- struct{}{}
  77                 buf, ok := h.disk[pdh]
  78                 if h.ops != nil {
  79                         (*h.ops)++
  80                 }
  81                 <-h.lock
  82                 if !ok {
  83                         resp.WriteHeader(http.StatusNotFound)
  84                 } else {
  85                         resp.Header().Set("Content-Length", fmt.Sprintf("%d", len(buf)))
  86                         resp.Write(buf)
  87                 }
  88         default:
  89                 resp.WriteHeader(http.StatusMethodNotAllowed)
  90         }
  91 }
  92
  93 type rdrTest struct {
  94         mt   string      // manifest text
  95         f    string      // filename
  96         want interface{} // error or string to expect
  97 }
  98
  99 func (s *CollectionReaderUnit) TestCollectionReaderContent(c *check.C) {
 100         s.kc.PutB([]byte("foo"))
 101         s.kc.PutB([]byte("bar"))
 102         s.kc.PutB([]byte("Hello world\n"))
 103         s.kc.PutB([]byte(""))
 104
 105         mt := arvadostest.PathologicalManifest
 106
 107         for _, testCase := range []rdrTest{
 108                 {mt: mt, f: "zzzz", want: os.ErrNotExist},
 109                 {mt: mt, f: "frob", want: os.ErrNotExist},
 110                 {mt: mt, f: "/segmented/frob", want: "frob"},
 111                 {mt: mt, f: "./segmented/frob", want: "frob"},
 112                 {mt: mt, f: "/f", want: "f"},
 113                 {mt: mt, f: "./f", want: "f"},
 114                 {mt: mt, f: "foo bar//baz", want: "foo"},
 115                 {mt: mt, f: "foo/zero", want: ""},
 116                 {mt: mt, f: "zero@0", want: ""},
 117                 {mt: mt, f: "zero@1", want: ""},
 118                 {mt: mt, f: "zero@4", want: ""},
 119                 {mt: mt, f: "zero@9", want: ""},
 120                 {mt: mt, f: "f", want: "f"},
 121                 {mt: mt, f: "ooba", want: "ooba"},
 122                 {mt: mt, f: "overlapReverse/o", want: "o"},
 123                 {mt: mt, f: "overlapReverse/oo", want: "oo"},
 124                 {mt: mt, f: "overlapReverse/ofoo", want: "ofoo"},
 125                 {mt: mt, f: "foo bar/baz", want: "foo"},
 126                 {mt: mt, f: "segmented/frob", want: "frob"},
 127                 {mt: mt, f: "segmented/oof", want: "oof"},
 128         } {
 129                 c.Logf("%#v", testCase)
 130                 rdr, err := s.kc.CollectionFileReader(map[string]interface{}{"manifest_text": testCase.mt}, testCase.f)
 131                 switch want := testCase.want.(type) {
 132                 case error:
 133                         c.Check(rdr, check.IsNil)
 134                         c.Check(err, check.Equals, want)
 135                 case string:
 136                         buf := make([]byte, len(want))
 137                         _, err := io.ReadFull(rdr, buf)
 138                         c.Check(err, check.IsNil)
 139                         for i := 0; i < 4; i++ {
 140                                 c.Check(string(buf), check.Equals, want)
 141                                 n, err := rdr.Read(buf)
 142                                 c.Check(n, check.Equals, 0)
 143                                 c.Check(err, check.Equals, io.EOF)
 144                         }
 145
 146                         for a := len(want) - 2; a >= 0; a-- {
 147                                 for b := a + 1; b <= len(want); b++ {
 148                                         offset, err := rdr.Seek(int64(a), io.SeekStart)
 149                                         c.Logf("...a=%d, b=%d", a, b)
 150                                         c.Check(err, check.IsNil)
 151                                         c.Check(offset, check.Equals, int64(a))
 152                                         buf := make([]byte, b-a)
 153                                         n, err := io.ReadFull(rdr, buf)
 154                                         c.Check(err, check.IsNil)
 155                                         c.Check(n, check.Equals, b-a)
 156                                         c.Check(string(buf), check.Equals, want[a:b])
 157                                 }
 158                         }
 159                         offset, err := rdr.Seek(-1, io.SeekStart)
 160                         c.Check(err, check.NotNil)
 161                         c.Check(offset, check.Equals, int64(len(want)))
 162
 163                         c.Check(rdr.Close(), check.Equals, nil)
 164                 }
 165         }
 166 }
 167
 168 func (s *CollectionReaderUnit) TestCollectionReaderManyBlocks(c *check.C) {
 169         h := md5.New()
 170         buf := make([]byte, 4096)
 171         locs := make([]string, len(buf))
 172         testdata := make([]byte, 0, len(buf)*len(buf))
 173         filesize := 0
 174         for i := range locs {
 175                 _, err := rand.Read(buf[:i])
 176                 c.Assert(err, check.IsNil)
 177                 h.Write(buf[:i])
 178                 locs[i], _, err = s.kc.PutB(buf[:i])
 179                 c.Assert(err, check.IsNil)
 180                 filesize += i
 181                 testdata = append(testdata, buf[:i]...)
 182         }
 183         manifest := "./random " + strings.Join(locs, " ") + " 0:" + strconv.Itoa(filesize) + ":bytes.bin\n"
 184         dataMD5 := h.Sum(nil)
 185
 186         checkMD5 := md5.New()
 187         rdr, err := s.kc.CollectionFileReader(map[string]interface{}{"manifest_text": manifest}, "random/bytes.bin")
 188         c.Assert(err, check.IsNil)
 189         defer rdr.Close()
 190
 191         _, err = io.Copy(checkMD5, rdr)
 192         c.Check(err, check.IsNil)
 193         _, err = rdr.Read(make([]byte, 1))
 194         c.Check(err, check.Equals, io.EOF)
 195         c.Check(checkMD5.Sum(nil), check.DeepEquals, dataMD5)
 196
 197         size, err := rdr.Seek(0, io.SeekEnd)
 198         c.Check(err, check.IsNil)
 199         buf = make([]byte, len(testdata))
 200         copy(buf, testdata)
 201         curPos := size
 202         for i := 0; i < 16; i++ {
 203                 offset := rand.Intn(len(buf) - 1)
 204                 count := rand.Intn(len(buf) - offset)
 205                 if rand.Intn(2) == 0 {
 206                         curPos, _ = rdr.Seek(int64(offset)-curPos, io.SeekCurrent)
 207                 } else {
 208                         curPos, _ = rdr.Seek(int64(offset), io.SeekStart)
 209                 }
 210                 c.Check(curPos, check.Equals, int64(offset))
 211                 for count > 0 {
 212                         n, err := rdr.Read(buf[offset : offset+count])
 213                         c.Assert(err, check.IsNil)
 214                         c.Assert(n > 0, check.Equals, true)
 215                         offset += n
 216                         count -= n
 217                 }
 218                 curPos, err = rdr.Seek(0, io.SeekCurrent)
 219                 c.Check(err, check.IsNil)
 220                 c.Check(curPos, check.Equals, int64(offset))
 221         }
 222         c.Check(md5.Sum(buf), check.DeepEquals, md5.Sum(testdata))
 223         c.Check(buf[:1000], check.DeepEquals, testdata[:1000])
 224
 225         expectPos := curPos + size + 12345
 226         curPos, err = rdr.Seek(size+12345, io.SeekCurrent)
 227         c.Check(err, check.IsNil)
 228         c.Check(curPos, check.Equals, expectPos)
 229
 230         curPos, err = rdr.Seek(8-curPos, io.SeekCurrent)
 231         c.Check(err, check.IsNil)
 232         c.Check(curPos, check.Equals, int64(8))
 233
 234         curPos, err = rdr.Seek(-9, io.SeekCurrent)
 235         c.Check(err, check.NotNil)
 236         c.Check(curPos, check.Equals, int64(8))
 237 }
 238
 239 func (s *CollectionReaderUnit) TestCollectionReaderCloseEarly(c *check.C) {
 240         s.kc.BlockCache = &BlockCache{}
 241         s.kc.PutB([]byte("foo"))
 242         s.kc.PutB([]byte("bar"))
 243         s.kc.PutB([]byte("baz"))
 244
 245         mt := ". "
 246         for i := 0; i < 300; i++ {
 247                 mt += "acbd18db4cc2f85cedef654fccc4a4d8+3 37b51d194a7513e45b56f6524f2d51f2+3 73feffa4b7f6bb68e44cf984c85f6e88+3 "
 248         }
 249         mt += "0:2700:foo900.txt\n"
 250
 251         // Grab the stub server's lock, ensuring our cfReader doesn't
 252         // get anything back from its first call to kc.Get() before we
 253         // have a chance to call Close().
 254         s.handler.lock <- struct{}{}
 255         opsBeforeRead := *s.handler.ops
 256
 257         rdr, err := s.kc.CollectionFileReader(map[string]interface{}{"manifest_text": mt}, "foo900.txt")
 258         c.Assert(err, check.IsNil)
 259
 260         firstReadDone := make(chan struct{})
 261         go func() {
 262                 n, err := rdr.Read(make([]byte, 3))
 263                 c.Check(n, check.Equals, 3)
 264                 c.Check(err, check.IsNil)
 265                 close(firstReadDone)
 266         }()
 267
 268         // Release the stub server's lock. The first GET operation will proceed.
 269         <-s.handler.lock
 270
 271         // Make sure our first read operation consumes the data
 272         // received from the first GET.
 273         <-firstReadDone
 274
 275         err = rdr.Close()
 276         c.Check(err, check.IsNil)
 277
 278         // Stub should have handled exactly one GET request.
 279         c.Check(*s.handler.ops, check.Equals, opsBeforeRead+1)
 280 }
 281
 282 func (s *CollectionReaderUnit) TestCollectionReaderDataError(c *check.C) {
 283         manifest := ". ffffffffffffffffffffffffffffffff+1 0:1:notfound.txt\n"
 284         buf := make([]byte, 1)
 285         rdr, err := s.kc.CollectionFileReader(map[string]interface{}{"manifest_text": manifest}, "notfound.txt")
 286         c.Check(err, check.IsNil)
 287         for i := 0; i < 2; i++ {
 288                 _, err = io.ReadFull(rdr, buf)
 289                 c.Check(err, check.NotNil)
 290                 c.Check(err, check.Not(check.Equals), io.EOF)
 291         }
 292         c.Check(rdr.Close(), check.IsNil)
 293 }