Golang x.DirectedEdge類代碼示例

// In benchmarks, the time taken per AddMutation before was
// plateauing at 2.5 ms with sync per 10 log entries, and increasing
// for sync per 100 log entries (to 3 ms per AddMutation), largely because
// of how index generation was being done.
//
// With this change, the benchmarks perform as good as benchmarks for
// commit.Logger, where the less frequently file sync happens, the faster
// AddMutations run.
//
// PASS
// BenchmarkAddMutations_SyncEveryLogEntry-6    	     100	  24712455 ns/op
// BenchmarkAddMutations_SyncEvery10LogEntry-6  	     500	   2485961 ns/op
// BenchmarkAddMutations_SyncEvery100LogEntry-6 	   10000	    298352 ns/op
// BenchmarkAddMutations_SyncEvery1000LogEntry-6	   30000	     63544 ns/op
// ok  	github.com/dgraph-io/dgraph/posting	10.291s
func (l *List) AddMutation(t x.DirectedEdge, op byte) error {
	l.wg.Wait()
	l.Lock()
	defer l.Unlock()
	if l.deleteMe {
		return E_TMP_ERROR
	}

	if t.Timestamp.UnixNano() < l.maxMutationTs {
		return fmt.Errorf("Mutation ts lower than committed ts.")
	}

	// Mutation arrives:
	// - Check if we had any(SET/DEL) before this, stored in the mutation list.
	//		- If yes, then replace that mutation. Jump to a)
	// a)		check if the entity exists in main posting list.
	// 				- If yes, store the mutation.
	// 				- If no, disregard this mutation.

	// All edges with a value set, have the same uid. In other words,
	// an (entity, attribute) can only have one interface{} value.
	if t.Value != nil {
		t.ValueId = math.MaxUint64
	}
	if t.ValueId == 0 {
		return fmt.Errorf("ValueId cannot be zero.")
	}

	mbuf := newPosting(t, op)
	uo := flatbuffers.GetUOffsetT(mbuf)
	mpost := new(types.Posting)
	mpost.Init(mbuf, uo)

	glog.WithFields(logrus.Fields{
		"uid":    mpost.Uid(),
		"source": string(mpost.Source()),
		"ts":     mpost.Ts(),
	}).Debug("Add mutation")

	l.mergeMutation(mpost)
	l.maxMutationTs = t.Timestamp.UnixNano()
	if len(l.mindex)+len(l.mlayer) > 0 {
		atomic.StoreInt64(&l.dirtyTs, time.Now().UnixNano())
		if dirtymap != nil {
			dirtymap.Put(l.ghash, true)
		}
	}
	if l.clog == nil {
		return nil
	}
	return l.clog.AddLog(t.Timestamp.UnixNano(), l.hash, mbuf)
}

func TestAddMutation(t *testing.T) {
	// logrus.SetLevel(logrus.DebugLevel)
	l := NewList()
	key := Key(1, "name")
	dir, err := ioutil.TempDir("", "storetest_")
	if err != nil {
		t.Error(err)
		return
	}

	defer os.RemoveAll(dir)
	ps := new(store.Store)
	ps.Init(dir)

	clog := commit.NewLogger(dir, "mutations", 50<<20)
	clog.Init()
	defer clog.Close()

	l.init(key, ps, clog)

	edge := x.DirectedEdge{
		ValueId:   9,
		Source:    "testing",
		Timestamp: time.Now(),
	}
	if err := l.AddMutation(edge, Set); err != nil {
		t.Error(err)
	}
	/*
		if err := l.CommitIfDirty(); err != nil {
			t.Error(err)
		}
	*/

	if l.Length() != 1 {
		t.Error("Unable to find added elements in posting list")
	}
	var p types.Posting
	if ok := l.Get(&p, 0); !ok {
		t.Error("Unable to retrieve posting at 1st iter")
		t.Fail()
	}
	if p.Uid() != 9 {
		t.Errorf("Expected 9. Got: %v", p.Uid)
	}
	if string(p.Source()) != "testing" {
		t.Errorf("Expected testing. Got: %v", string(p.Source()))
	}
	// return // Test 1.

	// Add another edge now.
	edge.ValueId = 81
	l.AddMutation(edge, Set)
	// l.CommitIfDirty()
	if l.Length() != 2 {
		t.Errorf("Length: %d", l.Length())
		t.Fail()
	}

	var uid uint64
	uid = 1
	for i := 0; i < l.Length(); i++ {
		if ok := l.Get(&p, i); !ok {
			t.Error("Unable to retrieve posting at 2nd iter")
		}
		uid *= 9
		if p.Uid() != uid {
			t.Logf("Expected: %v. Got: %v", uid, p.Uid())
		}
	}
	// return // Test 2.

	// Add another edge, in between the two above.
	uids := []uint64{
		9, 49, 81,
	}
	edge.ValueId = 49
	if err := l.AddMutation(edge, Set); err != nil {
		t.Error(err)
	}
	/*
		if err := l.CommitIfDirty(); err != nil {
			t.Error(err)
		}
	*/
	if err := checkUids(t, l, uids...); err != nil {
		t.Error(err)
	}
	// return // Test 3.

	// Delete an edge, add an edge, replace an edge
	edge.ValueId = 49
	if err := l.AddMutation(edge, Del); err != nil {
		t.Error(err)
	}

	edge.ValueId = 69
	if err := l.AddMutation(edge, Set); err != nil {
		t.Error(err)
	}
//.........這裏部分代碼省略.........

func TestProcessTask(t *testing.T) {
	// logrus.SetLevel(logrus.DebugLevel)

	dir, err := ioutil.TempDir("", "storetest_")
	if err != nil {
		t.Error(err)
		return
	}

	defer os.RemoveAll(dir)
	ps := new(store.Store)
	ps.Init(dir)

	clog := commit.NewLogger(dir, "mutations", 50<<20)
	clog.Init()
	defer clog.Close()

	Init(ps, clog)

	edge := x.DirectedEdge{
		ValueId:   23,
		Source:    "author0",
		Timestamp: time.Now(),
	}
	addEdge(t, edge, GetOrCreate(Key(10, "friend")))
	addEdge(t, edge, GetOrCreate(Key(11, "friend")))
	addEdge(t, edge, GetOrCreate(Key(12, "friend")))

	edge.ValueId = 25
	addEdge(t, edge, GetOrCreate(Key(12, "friend")))

	edge.ValueId = 26
	addEdge(t, edge, GetOrCreate(Key(12, "friend")))

	edge.ValueId = 31
	addEdge(t, edge, GetOrCreate(Key(10, "friend")))
	addEdge(t, edge, GetOrCreate(Key(12, "friend")))

	edge.Value = "photon"
	addEdge(t, edge, GetOrCreate(Key(12, "friend")))

	query := NewQuery("friend", []uint64{10, 11, 12})
	result, err := ProcessTask(query)
	if err != nil {
		t.Error(err)
	}

	ro := flatbuffers.GetUOffsetT(result)
	r := new(task.Result)
	r.Init(result, ro)

	if r.UidmatrixLength() != 3 {
		t.Errorf("Expected 3. Got uidmatrix length: %v", r.UidmatrixLength())
	}
	if err := check(r, 0, []uint64{23, 31}); err != nil {
		t.Error(err)
	}
	if err := check(r, 1, []uint64{23}); err != nil {
		t.Error(err)
	}
	if err := check(r, 2, []uint64{23, 25, 26, 31}); err != nil {
		t.Error(err)
	}

	if r.ValuesLength() != 3 {
		t.Errorf("Expected 3. Got values length: %v", r.ValuesLength())
	}
	var tval task.Value
	if ok := r.Values(&tval, 0); !ok {
		t.Errorf("Unable to retrieve value")
	}
	if tval.ValLength() != 1 ||
		tval.ValBytes()[0] != 0x00 {
		t.Errorf("Invalid byte value at index 0")
	}
	if ok := r.Values(&tval, 1); !ok {
		t.Errorf("Unable to retrieve value")
	}
	if tval.ValLength() != 1 ||
		tval.ValBytes()[0] != 0x00 {
		t.Errorf("Invalid byte value at index 0")
	}

	if ok := r.Values(&tval, 2); !ok {
		t.Errorf("Unable to retrieve value")
	}
	var iout interface{}
	if err := ParseValue(&iout, tval.ValBytes()); err != nil {
		t.Error(err)
	}
	v := iout.(string)
	if v != "photon" {
		t.Errorf("Expected photon. Got: %q", v)
	}
}

func TestAddMutation_Value(t *testing.T) {
	// logrus.SetLevel(logrus.DebugLevel)
	glog.Debug("Running init...")
	ol := NewList()
	key := Key(10, "value")
	dir, err := ioutil.TempDir("", "storetest_")
	if err != nil {
		t.Error(err)
		return
	}

	defer os.RemoveAll(dir)
	ps := new(store.Store)
	ps.Init(dir)

	clog := commit.NewLogger(dir, "mutations", 50<<20)
	clog.Init()
	defer clog.Close()

	ol.init(key, ps, clog)
	glog.Debug("Init successful.")

	edge := x.DirectedEdge{
		Value:     "oh hey there",
		Source:    "new-testing",
		Timestamp: time.Now(),
	}
	if err := ol.AddMutation(edge, Set); err != nil {
		t.Error(err)
	}
	var p types.Posting
	ol.Get(&p, 0)
	if p.Uid() != math.MaxUint64 {
		t.Errorf("All value uids should go to MaxUint64. Got: %v", p.Uid())
	}
	var iout interface{}
	if err := ParseValue(&iout, p.ValueBytes()); err != nil {
		t.Error(err)
	}
	out := iout.(string)
	if out != "oh hey there" {
		t.Errorf("Expected a value. Got: [%q]", out)
	}

	// Run the same check after committing.
	if _, err := ol.MergeIfDirty(); err != nil {
		t.Error(err)
	}
	{
		var tp types.Posting
		if ok := ol.Get(&tp, 0); !ok {
			t.Error("While retrieving posting")
		}
		if err := ParseValue(&iout, tp.ValueBytes()); err != nil {
			t.Error(err)
		}
		out := iout.(string)
		if out != "oh hey there" {
			t.Errorf("Expected a value. Got: [%q]", out)
		}
	}

	// The value made it to the posting list. Changing it now.
	edge.Value = 119
	if err := ol.AddMutation(edge, Set); err != nil {
		t.Error(err)
	}
	if ol.Length() != 1 {
		t.Errorf("Length should be one. Got: %v", ol.Length())
	}
	if ok := ol.Get(&p, 0); !ok {
		t.Error("While retrieving posting")
	}
	if err := ParseValue(&iout, p.ValueBytes()); err != nil {
		t.Error(err)
	}
	intout := iout.(float64)
	if intout != 119 {
		t.Errorf("Expected 119. Got: %v", intout)
	}
}

func populateGraph(t *testing.T) (string, *store.Store) {
	// logrus.SetLevel(logrus.DebugLevel)
	dir, err := ioutil.TempDir("", "storetest_")
	if err != nil {
		t.Error(err)
		return "", nil
	}

	ps := new(store.Store)
	ps.Init(dir)

	worker.Init(ps)

	clog := commit.NewLogger(dir, "mutations", 50<<20)
	clog.Init()
	posting.Init(clog)

	// So, user we're interested in has uid: 1.
	// She has 4 friends: 23, 24, 25, 31, and 101
	edge := x.DirectedEdge{
		ValueId:   23,
		Source:    "testing",
		Timestamp: time.Now(),
	}
	addEdge(t, edge, posting.GetOrCreate(posting.Key(1, "friend"), ps))

	edge.ValueId = 24
	addEdge(t, edge, posting.GetOrCreate(posting.Key(1, "friend"), ps))

	edge.ValueId = 25
	addEdge(t, edge, posting.GetOrCreate(posting.Key(1, "friend"), ps))

	edge.ValueId = 31
	addEdge(t, edge, posting.GetOrCreate(posting.Key(1, "friend"), ps))

	edge.ValueId = 101
	addEdge(t, edge, posting.GetOrCreate(posting.Key(1, "friend"), ps))

	// Now let's add a few properties for the main user.
	edge.Value = "Michonne"
	addEdge(t, edge, posting.GetOrCreate(posting.Key(1, "name"), ps))

	edge.Value = "female"
	addEdge(t, edge, posting.GetOrCreate(posting.Key(1, "gender"), ps))

	edge.Value = "alive"
	addEdge(t, edge, posting.GetOrCreate(posting.Key(1, "status"), ps))

	// Now let's add a name for each of the friends, except 101.
	edge.Value = "Rick Grimes"
	addEdge(t, edge, posting.GetOrCreate(posting.Key(23, "name"), ps))

	edge.Value = "Glenn Rhee"
	addEdge(t, edge, posting.GetOrCreate(posting.Key(24, "name"), ps))

	edge.Value = "Daryl Dixon"
	addEdge(t, edge, posting.GetOrCreate(posting.Key(25, "name"), ps))

	edge.Value = "Andrea"
	addEdge(t, edge, posting.GetOrCreate(posting.Key(31, "name"), ps))

	return dir, ps
}