Beispiel #1
0
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)
	}
}
Beispiel #2
0
// loadTestData adds all the test data into the database.
func loadTestData(context interface{}, db *db.DB) error {

	// Make sure the old data is clear.
	if err := unloadTestData(context, db); err != nil {
		if !graph.IsQuadNotExist(err) {
			return err
		}
	}

	// -----------------------------------------------------------
	// Load example items, relationships, views, and patterns.

	items, rels, vs, pats, err := wirefix.Get()
	if err != nil {
		return err
	}

	if err := wirefix.Add(context, db, items, rels, vs, pats); err != nil {
		return err
	}

	// -----------------------------------------------------------
	// Build the example graph.

	mongoURI := cfg.MustURL("MONGO_URI")

	if err := cayleyshelf.InitQuadStore(mongoURI.String()); err != nil {
		return err
	}

	var quads []quad.Quad
	quads = append(quads, quad.Make(wirePrefix+"d1dfa366-d2f7-4a4a-a64f-af89d4c97d82", wirePrefix+"on", wirePrefix+"c1b2bbfe-af9f-4903-8777-bd47c4d5b20a", ""))
	quads = append(quads, quad.Make(wirePrefix+"6eaaa19f-da7a-4095-bbe3-cee7a7631dd4", wirePrefix+"on", wirePrefix+"c1b2bbfe-af9f-4903-8777-bd47c4d5b20a", ""))
	quads = append(quads, quad.Make(wirePrefix+"d16790f8-13e9-4cb4-b9ef-d82835589660", wirePrefix+"on", wirePrefix+"c1b2bbfe-af9f-4903-8777-bd47c4d5b20a", ""))
	quads = append(quads, quad.Make(wirePrefix+"80aa936a-f618-4234-a7be-df59a14cf8de", wirePrefix+"authored", wirePrefix+"d1dfa366-d2f7-4a4a-a64f-af89d4c97d82", ""))
	quads = append(quads, quad.Make(wirePrefix+"80aa936a-f618-4234-a7be-df59a14cf8de", wirePrefix+"authored", wirePrefix+"6eaaa19f-da7a-4095-bbe3-cee7a7631dd4", ""))
	quads = append(quads, quad.Make(wirePrefix+"a63af637-58af-472b-98c7-f5c00743bac6", wirePrefix+"authored", wirePrefix+"d16790f8-13e9-4cb4-b9ef-d82835589660", ""))
	quads = append(quads, quad.Make(wirePrefix+"a63af637-58af-472b-98c7-f5c00743bac6", wirePrefix+"flagged", wirePrefix+"80aa936a-f618-4234-a7be-df59a14cf8de", ""))

	tx := cayley.NewTransaction()
	for _, quad := range quads {
		tx.AddQuad(quad)
	}

	if err := db.NewCayley(tests.Context, tests.TestSession); err != nil {
		return err
	}

	store, err := db.GraphHandle(tests.Context)
	if err != nil {
		return err
	}
	defer store.Close()

	if err := store.ApplyTransaction(tx); err != nil {
		return err
	}

	return nil
}
Beispiel #3
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)
	}
}
Beispiel #4
0
// unloadTestData removes all the test data from the database.
func unloadTestData(context interface{}, db *db.DB) error {

	// ------------------------------------------------------------
	// Clear items, relationships, and views.

	wirefix.Remove("context", db, wirePrefix)

	// ------------------------------------------------------------
	// Clear cayley graph.

	var quads []quad.Quad
	quads = append(quads, quad.Make(wirePrefix+"d1dfa366-d2f7-4a4a-a64f-af89d4c97d82", wirePrefix+"on", wirePrefix+"c1b2bbfe-af9f-4903-8777-bd47c4d5b20a", ""))
	quads = append(quads, quad.Make(wirePrefix+"6eaaa19f-da7a-4095-bbe3-cee7a7631dd4", wirePrefix+"on", wirePrefix+"c1b2bbfe-af9f-4903-8777-bd47c4d5b20a", ""))
	quads = append(quads, quad.Make(wirePrefix+"d16790f8-13e9-4cb4-b9ef-d82835589660", wirePrefix+"on", wirePrefix+"c1b2bbfe-af9f-4903-8777-bd47c4d5b20a", ""))
	quads = append(quads, quad.Make(wirePrefix+"80aa936a-f618-4234-a7be-df59a14cf8de", wirePrefix+"authored", wirePrefix+"d1dfa366-d2f7-4a4a-a64f-af89d4c97d82", ""))
	quads = append(quads, quad.Make(wirePrefix+"80aa936a-f618-4234-a7be-df59a14cf8de", wirePrefix+"authored", wirePrefix+"6eaaa19f-da7a-4095-bbe3-cee7a7631dd4", ""))
	quads = append(quads, quad.Make(wirePrefix+"a63af637-58af-472b-98c7-f5c00743bac6", wirePrefix+"authored", wirePrefix+"d16790f8-13e9-4cb4-b9ef-d82835589660", ""))
	quads = append(quads, quad.Make(wirePrefix+"a63af637-58af-472b-98c7-f5c00743bac6", wirePrefix+"flagged", wirePrefix+"80aa936a-f618-4234-a7be-df59a14cf8de", ""))

	tx := cayley.NewTransaction()
	for _, quad := range quads {
		tx.RemoveQuad(quad)
	}

	if err := db.NewCayley(tests.Context, tests.TestSession); err != nil {
		return err
	}

	store, err := db.GraphHandle(tests.Context)
	if err != nil {
		return err
	}
	defer store.Close()

	if err := store.ApplyTransaction(tx); err != nil {
		return err
	}

	return nil

}
Beispiel #5
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)
	}
}
Beispiel #6
0
)

var parseTests = []struct {
	message string
	input   string
	expect  []quad.Quad
	err     error
}{
	{
		message: "parse correct JSON",
		input: `[
			{"subject": "foo", "predicate": "bar", "object": "baz"},
			{"subject": "foo", "predicate": "bar", "object": "baz", "label": "graph"}
		]`,
		expect: []quad.Quad{
			quad.Make("foo", "bar", "baz", nil),
			quad.Make("foo", "bar", "baz", "graph"),
		},
		err: nil,
	},
	{
		message: "parse correct JSON with extra field",
		input: `[
			{"subject": "foo", "predicate": "bar", "object": "foo", "something_else": "extra data"}
		]`,
		expect: []quad.Quad{
			quad.Make("foo", "bar", "foo", nil),
		},
		err: nil,
	},
	{
Beispiel #7
0
func Quad(subject, predicate, object, label interface{}) quad.Quad {
	return quad.Make(subject, predicate, object, label)
}