func (nd *Node) save() (err error) {
if nd.name == "" && nd.Name() == "" {
return errors.New("Cannot add nameless file")
} else if nd.Parent() == nil && nd.parentId == "" && nd.Id != RootNodeId {
return errors.New("Cannot add file without parent")
}
staleQuads := graph.NewTransaction()
newQuads := graph.NewTransaction()
if name := nd.Name(); nd.name != name && name != "" && nd.name != "" {
staleQuads.RemoveQuad(cayley.Quad(nd.Id, nameLink, name, ""))
}
if nd.name != "" && nd.name != nd.Name() {
newQuads.AddQuad(cayley.Quad(nd.Id, nameLink, nd.name, ""))
nd.name = ""
}
if mimeType := nd.Type(); nd.mimeType != mimeType && mimeType != "" && nd.mimeType != "" {
staleQuads.RemoveQuad(cayley.Quad(nd.Id, typeLink, mimeType, ""))
}
if nd.mimeType != "" && nd.mimeType != nd.Type() {
newQuads.AddQuad(cayley.Quad(nd.Id, typeLink, nd.mimeType, ""))
nd.mimeType = ""
}
if mode := int(nd.Mode()); int(nd.mode) != mode && mode != 0 && int(nd.mode) != 0 {
staleQuads.RemoveQuad(cayley.Quad(nd.Id, modeLink, fmt.Sprint(mode), ""))
}
if int(nd.mode) > 0 && nd.mode != nd.Mode() {
newQuads.AddQuad(cayley.Quad(nd.Id, modeLink, fmt.Sprint(int(nd.mode)), ""))
nd.mode = os.FileMode(0)
}
if mTime := nd.MTime(); nd.mTime != mTime && !mTime.IsZero() && !nd.mTime.IsZero() {
staleQuads.RemoveQuad(cayley.Quad(nd.Id, mTimeLink, nd.MTime().Format(timeFormat), ""))
}
if !nd.mTime.IsZero() && nd.mTime != nd.MTime() {
newQuads.AddQuad(cayley.Quad(nd.Id, mTimeLink, nd.mTime.Format(timeFormat), ""))
nd.mTime = time.Time{}
}
if parent := nd.Parent(); parent != nil && parent.Id != nd.parentId && nd.parentId != "" {
staleQuads.RemoveQuad(cayley.Quad(nd.Id, parentLink, nd.Parent().Id, ""))
} else if parent != nil && parent.Id == nd.parentId {
nd.parentId = ""
}
if nd.parentId != "" {
newQuads.AddQuad(cayley.Quad(nd.Id, parentLink, nd.parentId, ""))
nd.parentId = ""
}
if err = nd.graph.ApplyTransaction(staleQuads); err != nil {
return
} else if err = nd.graph.ApplyTransaction(newQuads); err != nil {
return
}
return nil
}
func (nd *Node) WriteData(data []byte, offset int64) error {
if offset%BLOCK_SIZE != 0 {
return errors.New(fmt.Sprintf("%d is not a valid offset for block size %d", offset, BLOCK_SIZE))
}
hash := Hash(data)
transaction := graph.NewTransaction()
// Determine if we already have a block for this offset
linkName := fmt.Sprint("offset-", offset)
if existingBlockHash := nd.BlockWithOffset(offset); existingBlockHash != "" {
transaction.RemoveQuad(cayley.Quad(nd.Id, linkName, string(existingBlockHash), ""))
}
transaction.AddQuad(cayley.Quad(nd.Id, linkName, hash, ""))
if err := nd.graph.ApplyTransaction(transaction); err != nil {
return err
}
if _, err := Write(hash, data); err != nil {
return err
}
return nil
}
func TestTransaction(t *testing.T) {
qs, w, _ := makeTestStore(simpleGraph)
size := qs.Size()
tx := graph.NewTransaction()
tx.AddQuad(quad.Make(
"E",
"follows",
"G",
""))
tx.RemoveQuad(quad.Make(
"Non",
"existent",
"quad",
""))
err := w.ApplyTransaction(tx)
if err == nil {
t.Error("Able to remove a non-existent quad")
}
if size != qs.Size() {
t.Error("Appended a new quad in a failed transaction")
}
}
func TestTransaction(t *testing.T) {
qs, w, _ := makeTestStore(simpleGraph)
size := qs.Size()
tx := graph.NewTransaction()
tx.AddQuad(quad.Quad{
Subject: "E",
Predicate: "follows",
Object: "G",
Label: ""})
tx.RemoveQuad(quad.Quad{
Subject: "Non",
Predicate: "existent",
Object: "quad",
Label: ""})
err := w.ApplyTransaction(tx)
if err == nil {
t.Error("Able to remove a non-existent quad")
}
if size != qs.Size() {
t.Error("Appended a new quad in a failed transaction")
}
}