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Merge pull request #26 from ipfs/partial-file-test
Partial file test
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,4 @@ | ||
| // Package test provides ADL testing of the ipld specification around | ||
| // * traversal making use of match subsets | ||
| // * largeByteNode readers | ||
| package test |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| package test | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "io" | ||
| "testing" | ||
|
|
||
| u "github.com/ipfs/go-ipfs-util" | ||
| "github.com/ipfs/go-unixfsnode/data/builder" | ||
| "github.com/ipfs/go-unixfsnode/file" | ||
| dagpb "github.com/ipld/go-codec-dagpb" | ||
| "github.com/ipld/go-ipld-prime" | ||
| "github.com/ipld/go-ipld-prime/datamodel" | ||
| "github.com/ipld/go-ipld-prime/linking" | ||
| cidlink "github.com/ipld/go-ipld-prime/linking/cid" | ||
| basicnode "github.com/ipld/go-ipld-prime/node/basic" | ||
| "github.com/ipld/go-ipld-prime/traversal" | ||
| sb "github.com/ipld/go-ipld-prime/traversal/selector/builder" | ||
| ) | ||
|
|
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| func TestPartialFileAccess(t *testing.T) { | ||
| buf := make([]byte, 10*1024*1024) | ||
| u.NewSeededRand(0xdeadbeef).Read(buf) | ||
| r := bytes.NewReader(buf) | ||
|
|
||
| ls := cidlink.DefaultLinkSystem() | ||
| storage := cidlink.Memory{} | ||
| ls.StorageReadOpener = storage.OpenRead | ||
| ls.StorageWriteOpener = storage.OpenWrite | ||
|
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| f, _, err := builder.BuildUnixFSFile(r, "", &ls) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| // get back the root node substrate from the link at the top of the builder. | ||
| fr, err := ls.Load(ipld.LinkContext{}, f, dagpb.Type.PBNode) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| ufn, err := file.NewUnixFSFile(context.Background(), fr, &ls) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| openedLinks := []ipld.Link{} | ||
| ls.StorageReadOpener = func(lc linking.LinkContext, l datamodel.Link) (io.Reader, error) { | ||
| openedLinks = append(openedLinks, l) | ||
| return storage.OpenRead(lc, l) | ||
| } | ||
|
|
||
| // read back out the file. | ||
| out, err := ufn.AsBytes() | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if !bytes.Equal(out, buf) { | ||
| t.Fatal("Not equal") | ||
| } | ||
|
|
||
| fullLen := len(openedLinks) | ||
|
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| openedLinks = []ipld.Link{} | ||
|
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| partial, err := ufn.(datamodel.LargeBytesNode).AsLargeBytes() | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| half := make([]byte, len(buf)/2) | ||
| if _, err := partial.Read(half); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if len(openedLinks) >= fullLen { | ||
| t.Fatal("should not have accessed full file on a partial read.") | ||
| } | ||
|
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||
| openedLinks = []ipld.Link{} | ||
|
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||
| prog := traversal.Progress{ | ||
| Cfg: &traversal.Config{ | ||
| LinkSystem: ls, | ||
| }, | ||
| } | ||
| sb := sb.NewSelectorSpecBuilder(basicnode.Prototype.Any) | ||
| ss := sb.MatcherSubset(5*1024*1024, 6*1024*1024) | ||
| sel, err := ss.Selector() | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
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||
| if err := prog.WalkMatching(ufn, sel, func(_ traversal.Progress, n datamodel.Node) error { | ||
| b, err := n.AsBytes() | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if len(b) != 1024*1024 { | ||
| t.Fatalf("wrong length: %d", len(b)) | ||
| } | ||
| return nil | ||
| }); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if len(openedLinks) >= fullLen { | ||
| t.Fatal("should not have accessed full file on a partial traversal.") | ||
| } | ||
| } |