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Support in-place extraction with -k option and re-use chunks already …
…written to the output file in other places (#38)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| package desync | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "crypto/md5" | ||
| "io" | ||
| "io/ioutil" | ||
| "os" | ||
| "testing" | ||
| ) | ||
|
|
||
| func TestExtract(t *testing.T) { | ||
| // Make a test file that's guaranteed to have duplicate chunks. | ||
| b, err := ioutil.ReadFile("testdata/chunker.input") | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| for i := 0; i < 4; i++ { // Replicate it a few times to make sure we get dupes | ||
| b = append(b, b...) | ||
| } | ||
| b = append(b, make([]byte, 2*ChunkSizeMaxDefault)...) // want to have at least one null-chunk in the input | ||
| in, err := ioutil.TempFile("", "in") | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| defer os.RemoveAll(in.Name()) | ||
| if _, err := io.Copy(in, bytes.NewReader(b)); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| in.Close() | ||
|
|
||
| // Record the checksum of the input file, used to compare to the output later | ||
| inSum := md5.Sum(b) | ||
|
|
||
| // Chunk the file to get an index | ||
| index, _, err := IndexFromFile( | ||
| context.Background(), | ||
| in.Name(), | ||
| 10, | ||
| ChunkSizeMinDefault, ChunkSizeAvgDefault, ChunkSizeMaxDefault, | ||
| nil, | ||
| ) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| // Chop up the input file into a (temporary) local store | ||
| store, err := ioutil.TempDir("", "store") | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| defer os.RemoveAll(store) | ||
|
|
||
| s, err := NewLocalStore(store) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if err := ChopFile(context.Background(), in.Name(), index.Chunks, s, 10, nil); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| // Make a blank store - used to test a case where no chunk *should* be requested | ||
| blankstore, err := ioutil.TempDir("", "blankstore") | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| defer os.RemoveAll(blankstore) | ||
| bs, err := NewLocalStore(blankstore) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| // Prepare output files for each test - first a non-existing one | ||
| out1, err := ioutil.TempFile("", "out1") | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| os.RemoveAll(out1.Name()) | ||
|
|
||
| // This one is a complete file matching what we exepct at the end | ||
| out2, err := ioutil.TempFile("", "out2") | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if _, err := io.Copy(out2, bytes.NewReader(b)); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| out2.Close() | ||
| defer os.RemoveAll(out2.Name()) | ||
|
|
||
| // Incomplete or damaged file that has most but not all data | ||
| out3, err := ioutil.TempFile("", "out3") | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| b[0] ^= 0xff // flip some bits | ||
| b[len(b)-1] ^= 0xff | ||
| b = append(b, 0) // make it longer | ||
| if _, err := io.Copy(out3, bytes.NewReader(b)); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| out3.Close() | ||
| defer os.RemoveAll(out3.Name()) | ||
|
|
||
| // At this point we have the data needed for the test setup | ||
| // in - Temp file that represents the original input file | ||
| // inSub - MD5 of the input file | ||
| // index - Index file for the input file | ||
| // s - Local store containing the chunks needed to rebuild the input file | ||
| // bs - A blank local store, all GetChunk fail on it | ||
| // out1 - Just a non-existing file that gets assembled | ||
| // out2 - The output file already fully complete, no GetChunk should be needed | ||
| // out3 - Partial/damaged file with most, but not all data correct | ||
|
|
||
| tests := map[string]struct { | ||
| outfile string | ||
| store Store | ||
| }{ | ||
| "extract to new file": {outfile: out1.Name(), store: s}, | ||
| "extract to complete file": {outfile: out2.Name(), store: bs}, | ||
| "extract to incomplete file": {outfile: out3.Name(), store: s}, | ||
| } | ||
|
|
||
| for name, test := range tests { | ||
| t.Run(name, func(t *testing.T) { | ||
| if err := AssembleFile(context.Background(), test.outfile, index, test.store, 10, nil); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| b, err := ioutil.ReadFile(test.outfile) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| outSum := md5.Sum(b) | ||
| if inSum != outSum { | ||
| t.Fatal("checksum of extracted file doesn't match expected") | ||
| } | ||
| }) | ||
| } | ||
| } |
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