func main() {
// To see how most of this works, see hello_world -- this just add in a transaction
store, err := cayley.NewMemoryGraph()
if err != nil {
log.Fatalln(err)
}
// Create a transaction of work to do
// NOTE: the transaction is independent of the storage type, so comes from cayley rather than store
t := cayley.NewTransaction()
t.AddQuad(quad.Make("food", "is", "good", nil))
t.AddQuad(quad.Make("phrase of the day", "is of course", "Hello World!", nil))
t.AddQuad(quad.Make("cats", "are", "awesome", nil))
t.AddQuad(quad.Make("cats", "are", "scary", nil))
t.AddQuad(quad.Make("cats", "want to", "kill you", nil))
// Apply the transaction
err = store.ApplyTransaction(t)
if err != nil {
log.Fatalln(err)
}
p := cayley.StartPath(store, quad.String("cats")).Out(quad.String("are"))
err = p.Iterate(nil).EachValue(nil, func(v quad.Value) {
fmt.Println("cats are", v.Native())
})
if err != nil {
log.Fatalln(err)
}
}
// StartQueryFromNods returns a new query starting at the node with the given IDs.
func (gl *GraphLayer) StartQueryFromNode(nodeId GraphNodeId) GraphQuery {
singleStartingValue := nodeIdToValue(nodeId)
return GraphQuery{
path: cayley.StartPath(gl.cayleyStore, singleStartingValue),
layer: gl,
tagCount: 0,
singleStartingValue: singleStartingValue,
singlePredicate: nil,
singleDirection: 0,
}
}
func main() {
// File for your new BoltDB. Use path to regular file and not temporary in the real world
tmpfile, err := ioutil.TempFile("", "example")
if err != nil {
log.Fatal(err)
}
defer os.Remove(tmpfile.Name()) // clean up
// Initialize the database
graph.InitQuadStore("bolt", tmpfile.Name(), nil)
// Open and use the database
store, err := cayley.NewGraph("bolt", tmpfile.Name(), nil)
if err != nil {
log.Fatalln(err)
}
store.AddQuad(quad.Make("phrase of the day", "is of course", "Hello BoltDB!", "demo graph"))
// Now we create the path, to get to our data
p := cayley.StartPath(store, quad.String("phrase of the day")).Out(quad.String("is of course"))
// This is more advanced example of the query.
// Simpler equivalent can be found in hello_world example.
// Now we get an iterator for the path and optimize it.
// The second return is if it was optimized, but we don't care for now.
it, _ := p.BuildIterator().Optimize()
// Optimize iterator on quad store level.
// After this step iterators will be replaced with backend-specific ones.
it, _ = store.OptimizeIterator(it)
// remember to cleanup after yourself
defer it.Close()
// While we have items
for it.Next() {
token := it.Result() // get a ref to a node (backend-specific)
value := store.NameOf(token) // get the value in the node (RDF)
nativeValue := quad.NativeOf(value) // convert value to normal Go type
fmt.Println(nativeValue) // print it!
}
if err := it.Err(); err != nil {
log.Fatalln(err)
}
}
func storiesByKeys(g *cayley.Handle, keys []string) []*Story {
stories := make([]*Story, 0, len(keys))
it, _ := cayley.StartPath(g, keys...).Save(StoryID, StoryID).Save(StoryTitle, StoryTitle).Save(StoryDescription, StoryDescription).Save(SiteID, SiteID).BuildIterator().Optimize()
defer it.Close()
for cayley.RawNext(it) {
s := Story{}
results := map[string]graph.Value{}
it.TagResults(results)
s.Id = atoi(g.NameOf(results[StoryID]))
s.Title = g.NameOf(results[StoryTitle])
s.Desc = g.NameOf(results[StoryDescription])
s.Site = Site(Site_value[g.NameOf(results[SiteID])])
s.annotate()
stories = append(stories, &s)
}
return stories
}
// StartQueryFromNodes returns a new query starting at the nodes with the given IDs.
func (gl *GraphLayer) StartQueryFromNodes(nodeIds ...GraphNodeId) GraphQuery {
quadValues := graphIdsToQuadValues(nodeIds)
var singleStartingValue quad.Value = nil
if len(quadValues) == 1 {
singleStartingValue = quadValues[0]
}
return GraphQuery{
path: cayley.StartPath(gl.cayleyStore, quadValues...),
layer: gl,
tagCount: 0,
singleStartingValue: singleStartingValue,
singlePredicate: nil,
singleDirection: 0,
}
}
// StartQuery returns a new query starting at the nodes with the given values (either graph node IDs
// or arbitrary values).
func (gl *GraphLayer) StartQuery(values ...interface{}) GraphQuery {
quadValues := toQuadValues(values, gl)
var singleStartingValue quad.Value = nil
if len(values) == 1 {
singleStartingValue = quadValues[0]
}
return GraphQuery{
path: cayley.StartPath(gl.cayleyStore, quadValues...),
layer: gl,
tagCount: 0,
singleStartingValue: singleStartingValue,
singlePredicate: nil,
singleDirection: 0,
}
}
func main() {
// Create a brand new graph
store, err := cayley.NewMemoryGraph()
if err != nil {
log.Fatalln(err)
}
store.AddQuad(quad.Make("phrase of the day", "is of course", "Hello World!", nil))
// Now we create the path, to get to our data
p := cayley.StartPath(store, quad.String("phrase of the day")).Out(quad.String("is of course"))
// Now we iterate over results. Arguments:
// 1. Optional context used for cancellation.
// 2. Quad store, but we can omit it because we have already built path with it.
err = p.Iterate(nil).EachValue(nil, func(value quad.Value) {
nativeValue := quad.NativeOf(value) // this converts RDF values to normal Go types
fmt.Println(nativeValue)
})
if err != nil {
log.Fatalln(err)
}
}
// TestUpsertItem tests the insert and update of an item.
func TestUpsertItem(t *testing.T) {
store := setup(t)
defer teardown(t, store)
t.Log("Given the need to insert and then update an item.")
{
//----------------------------------------------------------------------
// Get the fixture.
items, err := itemfix.Get()
if err != nil {
t.Fatalf("\t%s\tShould be able to retrieve the fixture : %v", tests.Failed, err)
}
t.Logf("\t%s\tShould be able to retrieve the fixture.", tests.Success)
itemStrData, err := json.Marshal(&items[0])
if err != nil {
t.Fatalf("\t%s\tShould be able to marshal the fixture : %v", tests.Failed, err)
}
t.Logf("\t%s\tShould be able to marshal the fixture.", tests.Success)
//----------------------------------------------------------------------
// Insert the Item.
url := "/v1/item"
r := httptest.NewRequest("PUT", url, bytes.NewBuffer(itemStrData))
w := httptest.NewRecorder()
a.ServeHTTP(w, r)
t.Logf("\tWhen calling url to insert : %s", url)
{
if w.Code != http.StatusOK {
t.Fatalf("\t%s\tShould be able to insert the item : %v", tests.Failed, w.Code)
}
t.Logf("\t%s\tShould be able to insert the item.", tests.Success)
}
//----------------------------------------------------------------------
// Check the inferred relationship.
p := cayley.StartPath(store, quad.String("ITEST_80aa936a-f618-4234-a7be-df59a14cf8de")).Out(quad.String("authored"))
it, _ := p.BuildIterator().Optimize()
defer it.Close()
for it.Next() {
token := it.Result()
value := store.NameOf(token)
if quad.NativeOf(value) != "ITEST_d1dfa366-d2f7-4a4a-a64f-af89d4c97d82" {
t.Fatalf("\t%s\tShould be able to get the inferred relationships from the graph", tests.Failed)
}
}
if err := it.Err(); err != nil {
t.Fatalf("\t%s\tShould be able to get the inferred relationships from the graph : %s", tests.Failed, err)
}
it.Close()
t.Logf("\t%s\tShould be able to get the inferred relationships from the graph.", tests.Success)
//----------------------------------------------------------------------
// Retrieve the item.
url = "/v1/item/" + items[0].ID
r = httptest.NewRequest("GET", url, nil)
w = httptest.NewRecorder()
a.ServeHTTP(w, r)
t.Logf("\tWhen calling url to get : %s", url)
{
if w.Code != http.StatusOK {
t.Fatalf("\t%s\tShould be able to retrieve the item : %v", tests.Failed, w.Code)
}
t.Logf("\t%s\tShould be able to retrieve the item.", tests.Success)
var itemsBack []item.Item
if err := json.Unmarshal(w.Body.Bytes(), &itemsBack); err != nil {
t.Fatalf("\t%s\tShould be able to unmarshal the results : %v", tests.Failed, err)
}
t.Logf("\t%s\tShould be able to unmarshal the results.", tests.Success)
if itemsBack[0].ID != items[0].ID || itemsBack[0].Type != items[0].Type {
t.Logf("\t%+v", items[0])
t.Logf("\t%+v", itemsBack[0])
t.Fatalf("\t%s\tShould be able to get back the same item.", tests.Failed)
}
t.Logf("\t%s\tShould be able to get back the same item.", tests.Success)
}
//----------------------------------------------------------------------
// Update the Item.
items[0].Version = 2
itemStrData, err = json.Marshal(items[0])
if err != nil {
t.Fatalf("\t%s\tShould be able to marshal the changed fixture : %v", tests.Failed, err)
}
t.Logf("\t%s\tShould be able to marshal the changed fixture.", tests.Success)
url = "/v1/item"
r = httptest.NewRequest("PUT", url, bytes.NewBuffer(itemStrData))
w = httptest.NewRecorder()
a.ServeHTTP(w, r)
t.Logf("\tWhen calling url to update : %s", url)
{
if w.Code != http.StatusOK {
t.Fatalf("\t%s\tShould be able to update the item : %v", tests.Failed, w.Code)
}
t.Logf("\t%s\tShould be able to update the item.", tests.Success)
}
//----------------------------------------------------------------------
// Retrieve the Item.
url = "/v1/item/" + items[0].ID
r = httptest.NewRequest("GET", url, nil)
w = httptest.NewRecorder()
a.ServeHTTP(w, r)
t.Logf("\tWhen calling url to get : %s", url)
{
if w.Code != http.StatusOK {
t.Fatalf("\t%s\tShould be able to retrieve the item : %v", tests.Failed, w.Code)
}
t.Logf("\t%s\tShould be able to retrieve the item.", tests.Success)
var itUpdated []item.Item
if err := json.Unmarshal(w.Body.Bytes(), &itUpdated); err != nil {
t.Fatalf("\t%s\tShould be able to unmarshal the results : %v", tests.Failed, err)
}
t.Logf("\t%s\tShould be able to unmarshal the results.", tests.Success)
if itUpdated[0].Version != 2 {
t.Log(w.Body.String())
t.Fatalf("\t%s\tShould get the expected result.", tests.Failed)
}
t.Logf("\t%s\tShould get the expected result.", tests.Success)
}
}
}
// TestDeleteItem tests the insert and deletion of a item.
func TestDeleteItem(t *testing.T) {
store := setup(t)
defer teardown(t, store)
t.Log("Given the need to delete an item.")
{
//----------------------------------------------------------------------
// Delete the Item.
url := "/v1/item/ITEST_d1dfa366-d2f7-4a4a-a64f-af89d4c97d82"
r := httptest.NewRequest("DELETE", url, nil)
w := httptest.NewRecorder()
a.ServeHTTP(w, r)
t.Logf("\tWhen calling url to delete : %s", url)
{
if w.Code != http.StatusNoContent {
t.Fatalf("\t%s\tShould be able to delete the item : %v", tests.Failed, w.Code)
}
t.Logf("\t%s\tShould be able to delete the item.", tests.Success)
}
//----------------------------------------------------------------------
// Retrieve the Item.
url = "/v1/view/ITEST_d1dfa366-d2f7-4a4a-a64f-af89d4c97d82"
r = httptest.NewRequest("GET", url, nil)
w = httptest.NewRecorder()
a.ServeHTTP(w, r)
t.Logf("\tWhen calling url to get : %s", url)
{
if w.Code != 404 {
t.Fatalf("\t%s\tShould not be able to retrieve the item : %v", tests.Failed, w.Code)
}
t.Logf("\t%s\tShould not be able to retrieve the item.", tests.Success)
}
//----------------------------------------------------------------------
// Check the inferred relationships.
p := cayley.StartPath(store, quad.String("ITEST_80aa936a-f618-4234-a7be-df59a14cf8de")).Out(quad.String("authored"))
it, _ := p.BuildIterator().Optimize()
defer it.Close()
var count int
for it.Next() {
count++
}
if err := it.Err(); err != nil {
t.Fatalf("\t%s\tShould be able to confirm removed relationships : %s", tests.Failed, err)
}
if count > 0 {
t.Fatalf("\t%s\tShould be able to confirm removed relationships.", tests.Failed)
}
t.Logf("\t%s\tShould be able to confirm removed relationships.", tests.Success)
}
}
func (s Story) checkExistsTitle(g *cayley.Handle) bool {
it, _ := cayley.StartPath(g, s.key()).Out(StoryTitle).BuildIterator().Optimize()
defer it.Close()
return cayley.RawNext(it)
}
func (u User) checkExists(g *cayley.Handle) bool {
it, _ := cayley.StartPath(g, u.key()).Out(UserID).BuildIterator().Optimize()
defer it.Close()
return cayley.RawNext(it)
}
// viewPathToGraphPath translates the path in a view into a "path"
// utilized in graph queries.
func viewPathToGraphPath(v *view.View, key string, graphDB *cayley.Handle) (*path.Path, error) {
// outputPath is the final tranlated graph path.
var outputPath *path.Path
// Loop over the paths in the view translating the metadata.
for idx, pth := range v.Paths {
// We create an alias prefix for tags, so we can track which
// path a tag is in.
alias := strconv.Itoa(idx+1) + "_"
// Sort the view Path value.
sort.Sort(pth.Segments)
// graphPath will contain the entire strict graph path.
var graphPath *path.Path
// subPaths will contain each sub path of the full graph path,
// as a separate graph path.
var subPaths []path.Path
// Loop over the path segments translating the path.
level := 1
for _, segment := range pth.Segments {
// Check that the level is the level we expect (i.e., that the levels
// are in order)
if level != segment.Level {
err := fmt.Errorf("Invalid view path level, expected %d but seeing %d", level, segment.Level)
return graphPath, err
}
// Initialize the path, if we are on level 1.
if level == 1 {
// Add the first level relationship.
switch segment.Direction {
case inString:
graphPath = cayley.StartPath(graphDB, quad.String(key)).In(quad.String(segment.Predicate))
case outString:
graphPath = cayley.StartPath(graphDB, quad.String(key)).Out(quad.String(segment.Predicate))
}
// Add the tag, if present.
if segment.Tag != "" {
graphPath = graphPath.Clone().Tag(alias + segment.Tag)
}
// Track this as a subpath.
subPaths = append(subPaths, *graphPath.Clone())
level++
continue
}
// Add the relationship.
switch segment.Direction {
case inString:
graphPath = graphPath.Clone().In(quad.String(segment.Predicate))
case outString:
graphPath = graphPath.Clone().Out(quad.String(segment.Predicate))
}
// Add the tag, if present.
if segment.Tag != "" {
graphPath = graphPath.Clone().Tag(alias + segment.Tag)
}
// Add this as a subpath.
subPaths = append(subPaths, *graphPath.Clone())
level++
}
// If we are forcing a strict path, return only the resulting or
// tagged items along the full path.
if pth.StrictPath {
if outputPath == nil {
outputPath = graphPath
continue
}
outputPath = outputPath.Clone().Or(graphPath)
continue
}
// Otherwise add all the subpaths to the output path.
for _, subPath := range subPaths {
if outputPath == nil {
addedPath := &subPath
outputPath = addedPath.Clone()
continue
}
outputPath = outputPath.Clone().Or(&subPath)
}
}
return outputPath, nil
}
// TestAddRemoveGraph tests if we can add/remove relationship quads to/from cayley.
func TestAddRemoveGraph(t *testing.T) {
db, store, items := setupGraph(t)
defer tests.DisplayLog()
t.Log("Given the need to add/remove relationship quads from the Cayley graph.")
{
t.Log("\tWhen starting from an empty graph")
{
//----------------------------------------------------------------------
// Infer and add the relationships to the graph.
if err := wire.AddToGraph(tests.Context, db, store, items[0]); err != nil {
t.Fatalf("\t%s\tShould be able to add relationships to the graph : %s", tests.Failed, err)
}
t.Logf("\t%s\tShould be able to add relationships to the graph.", tests.Success)
//----------------------------------------------------------------------
// Get the relationship quads from the graph.
p := cayley.StartPath(store, quad.String("WTEST_80aa936a-f618-4234-a7be-df59a14cf8de")).Out(quad.String("WTEST_flagged"))
it, _ := p.BuildIterator().Optimize()
defer it.Close()
var count int
for it.Next() {
count++
token := it.Result()
value := store.NameOf(token)
if quad.NativeOf(value) != "WTEST_d1dfa366-d2f7-4a4a-a64f-af89d4c97d82" {
t.Fatalf("\t%s\tShould be able to get the relationships from the graph", tests.Failed)
}
}
if err := it.Err(); err != nil {
t.Fatalf("\t%s\tShould be able to get the relationships from the graph : %s", tests.Failed, err)
}
it.Close()
p = cayley.StartPath(store, quad.String("WTEST_d1dfa366-d2f7-4a4a-a64f-af89d4c97d82")).Out(quad.String("WTEST_on"))
it, _ = p.BuildIterator().Optimize()
defer it.Close()
for it.Next() {
count++
token := it.Result()
value := store.NameOf(token)
if quad.NativeOf(value) != "WTEST_c1b2bbfe-af9f-4903-8777-bd47c4d5b20a" {
t.Fatalf("\t%s\tShould be able to get the relationships from the graph", tests.Failed)
}
}
if err := it.Err(); err != nil {
t.Fatalf("\t%s\tShould be able to get the relationships from the graph : %s", tests.Failed, err)
}
it.Close()
if count != 2 {
t.Fatalf("\t%s\tShould be able to get relationships from the graph", tests.Failed)
}
t.Logf("\t%s\tShould be able to get relationships from the graph.", tests.Success)
//----------------------------------------------------------------------
// Try to infer and add the relationships again.
if err := wire.AddToGraph(tests.Context, db, store, items[0]); err != nil {
t.Fatalf("\t%s\tShould be able to add an item again and maintain relationships : %s", tests.Failed, err)
}
t.Logf("\t%s\tShould be able to add an item again and maintain relationships.", tests.Success)
//----------------------------------------------------------------------
// Remove the relationships from the graph.
if err := wire.RemoveFromGraph(tests.Context, db, store, items[0]); err != nil {
t.Fatalf("\t%s\tShould be able to remove relationships from the graph : %s", tests.Failed, err)
}
t.Logf("\t%s\tShould be able to remove relationships from the graph.", tests.Success)
//----------------------------------------------------------------------
// Try to get the relationships.
count = 0
p = cayley.StartPath(store, quad.String("WTEST_80aa936a-f618-4234-a7be-df59a14cf8de")).Out(quad.String("WTEST_authored"))
it, _ = p.BuildIterator().Optimize()
defer it.Close()
for it.Next() {
count++
}
if err := it.Err(); err != nil {
t.Fatalf("\t%s\tShould be able to verify the empty graph : %s", tests.Failed, err)
}
it.Close()
p = cayley.StartPath(store, quad.String("WTEST_d1dfa366-d2f7-4a4a-a64f-af89d4c97d82")).Out(quad.String("WTEST_on"))
it, _ = p.BuildIterator().Optimize()
defer it.Close()
for it.Next() {
count++
}
if err := it.Err(); err != nil {
t.Fatalf("\t%s\tShould be able to verify the empty graph : %s", tests.Failed, err)
}
it.Close()
if count != 0 {
t.Fatalf("\t%s\tShould be able to verify the empty graph", tests.Failed)
}
t.Logf("\t%s\tShould be able to verify the empty graph.", tests.Success)
}
}
}
// TestImportRemoveItem tests the insert and update of an item.
func TestImportRemoveItem(t *testing.T) {
db, store := setup(t)
defer teardown(t, db, store)
t.Log("Given the need to import an item.")
{
//----------------------------------------------------------------------
// Get the fixture.
items, err := itemfix.Get()
if err != nil {
t.Fatalf("\t%s\tShould be able to retrieve the fixture : %v", tests.Failed, err)
}
t.Logf("\t%s\tShould be able to retrieve the fixture.", tests.Success)
//----------------------------------------------------------------------
// Import the Item.
if err := sponge.Import(tests.Context, db, store, &items[0]); err != nil {
t.Fatalf("\t%s\tShould be able to import an item : %s", tests.Failed, err)
}
t.Logf("\t%s\tShould be able to import an item", tests.Success)
//----------------------------------------------------------------------
// Check the inferred relationship.
p := cayley.StartPath(store, quad.String("ITEST_80aa936a-f618-4234-a7be-df59a14cf8de")).Out(quad.String("authored"))
it, _ := p.BuildIterator().Optimize()
defer it.Close()
for it.Next() {
token := it.Result()
value := store.NameOf(token)
if quad.NativeOf(value) != "ITEST_d1dfa366-d2f7-4a4a-a64f-af89d4c97d82" {
t.Fatalf("\t%s\tShould be able to get the inferred relationships from the graph", tests.Failed)
}
}
if err := it.Err(); err != nil {
t.Fatalf("\t%s\tShould be able to get the inferred relationships from the graph : %s", tests.Failed, err)
}
it.Close()
t.Logf("\t%s\tShould be able to get the inferred relationships from the graph.", tests.Success)
//----------------------------------------------------------------------
// Import the Item again to test for duplicate imports.
if err := sponge.Import(tests.Context, db, store, &items[0]); err != nil {
t.Fatalf("\t%s\tShould be able to import a duplicate item : %s", tests.Failed, err)
}
t.Logf("\t%s\tShould be able to import a duplicate item", tests.Success)
//----------------------------------------------------------------------
// Remove the item.
if err := sponge.Remove(tests.Context, db, store, items[0].ID); err != nil {
t.Fatalf("\t%s\tShould be able to remove the item : %s", tests.Failed, err)
}
t.Logf("\t%s\tShould be able to remove the item", tests.Success)
//----------------------------------------------------------------------
// Check the inferred relationships.
p = cayley.StartPath(store, quad.String("ITEST_80aa936a-f618-4234-a7be-df59a14cf8de")).Out(quad.String("authored"))
it, _ = p.BuildIterator().Optimize()
defer it.Close()
var count int
for it.Next() {
count++
}
if err := it.Err(); err != nil {
t.Fatalf("\t%s\tShould be able to confirm removed relationships : %s", tests.Failed, err)
}
if count > 0 {
t.Fatalf("\t%s\tShould be able to confirm removed relationships.", tests.Failed)
}
t.Logf("\t%s\tShould be able to confirm removed relationships.", tests.Success)
}
}
