github.com/uber/kraken@v0.1.4/core/metainfo_test.go (about)

     1  // Copyright (c) 2016-2019 Uber Technologies, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  package core
    15  
    16  import (
    17  	"math/rand"
    18  	"testing"
    19  
    20  	"github.com/stretchr/testify/require"
    21  
    22  	"github.com/uber/kraken/utils/memsize"
    23  )
    24  
    25  func TestMetaInfoGetPieceLength(t *testing.T) {
    26  	tests := []struct {
    27  		desc        string
    28  		size        uint64
    29  		pieceLength uint64
    30  		i           int
    31  		expected    int64
    32  	}{
    33  		{"first piece", 10, 3, 0, 3},
    34  		{"smaller last piece", 10, 3, 3, 1},
    35  		{"same size last piece", 8, 2, 3, 2},
    36  		{"middle piece", 10, 3, 1, 3},
    37  		{"outside bounds", 10, 3, 4, 0},
    38  		{"negative", 10, 3, -1, 0},
    39  	}
    40  	for _, test := range tests {
    41  		t.Run(test.desc, func(t *testing.T) {
    42  			blob := SizedBlobFixture(test.size, test.pieceLength)
    43  			require.Equal(t, test.expected, blob.MetaInfo.GetPieceLength(test.i))
    44  		})
    45  	}
    46  }
    47  
    48  func TestMetaInfoSerialization(t *testing.T) {
    49  	require := require.New(t)
    50  
    51  	blob := NewBlobFixture()
    52  
    53  	b, err := blob.MetaInfo.Serialize()
    54  	require.NoError(err)
    55  	result, err := DeserializeMetaInfo(b)
    56  	require.NoError(err)
    57  	require.Equal(blob.Digest, result.Digest())
    58  	require.Equal(blob.MetaInfo.InfoHash(), result.InfoHash())
    59  }
    60  
    61  func TestMetaInfoBackwardsCompatibility(t *testing.T) {
    62  	require := require.New(t)
    63  
    64  	// This metainfo / hash pair was taken from a production agent. It should
    65  	// be deserializable by the new logic and produce the same info hash.
    66  	// TODO(codyg): This test can be removed once this change is fully rolled
    67  	// out.
    68  	rawMetaInfo := `{"Info":{"PieceLength":4194304,"PieceSums":[2131691452],"Name":"289314c356bc2a19802c3e31505506db30ea81a0bcaea4ec3e079524c8ac3cf5","Length":236},"Announce":"","AnnounceList":null,"CreationDate":0,"Comment":"","CreatedBy":""}`
    69  
    70  	expectedInfoHash, err := NewInfoHashFromHex("85b978c4377625b3963df406d0dd3a1da5a7d9c3")
    71  	require.NoError(err)
    72  
    73  	result, err := DeserializeMetaInfo([]byte(rawMetaInfo))
    74  	require.NoError(err)
    75  	require.Equal(expectedInfoHash, result.InfoHash())
    76  }
    77  
    78  func TestMetaInfoSerializationLimit(t *testing.T) {
    79  
    80  	// MetaInfo is stored as raw bytes as a Redis value, and should stay
    81  	// within the limits of the value. Because the number of pieces in a
    82  	// torrent is variable, this test serves as a sanity check that reasonable
    83  	// blob size / piece length combinations can be safely serialized.
    84  	var redisValueLimit = 512 * memsize.MB
    85  
    86  	tests := []struct {
    87  		description string
    88  		blobSize    uint64
    89  		pieceLength uint64
    90  	}{
    91  		{"reasonable default", 2 * memsize.GB, 2 * memsize.MB},
    92  		{"large file", 100 * memsize.GB, 2 * memsize.MB},
    93  		{"tiny pieces", 2 * memsize.GB, 4 * memsize.KB},
    94  	}
    95  	for _, test := range tests {
    96  		t.Run(test.description, func(t *testing.T) {
    97  			require := require.New(t)
    98  
    99  			numPieces := test.blobSize / test.pieceLength
   100  			pieceSums := make([]uint32, numPieces)
   101  			for i := range pieceSums {
   102  				pieceSums[i] = rand.Uint32()
   103  			}
   104  
   105  			mi := MetaInfo{
   106  				info: info{
   107  					PieceLength: int64(test.pieceLength),
   108  					PieceSums:   pieceSums,
   109  					Name:        "6422b52513a39399598494bdb7471211890cd13c271fb5c11c5ba6538ed7578c",
   110  					Length:      int64(test.blobSize),
   111  				},
   112  			}
   113  			b, err := mi.Serialize()
   114  			require.NoError(err)
   115  			size := uint64(len(b))
   116  			require.True(size < redisValueLimit,
   117  				"%d piece serialization %d bytes too large", numPieces, size-redisValueLimit)
   118  		})
   119  	}
   120  }