func ExternalId(uid uint64) (xid string, rerr error) {
key := posting.Key(uid, "_xid_") // uid -> "_xid_" -> xid
pl := posting.GetOrCreate(key, uidStore)
if pl.Length() == 0 {
return "", errors.New("NO external id")
}
if pl.Length() > 1 {
glog.WithField("uid", uid).Fatal("This shouldn't be happening.")
return "", errors.New("Multiple external ids for this uid.")
}
var p types.Posting
if ok := pl.Get(&p, 0); !ok {
glog.WithField("uid", uid).Error("While retrieving posting")
return "", errors.New("While retrieving posting")
}
if p.Uid() != math.MaxUint64 {
glog.WithField("uid", uid).Fatal("Value uid must be MaxUint64.")
}
var t interface{}
rerr = posting.ParseValue(&t, p.ValueBytes())
xid = t.(string)
return xid, rerr
}
func (s *state) handleNQuads(wg *sync.WaitGroup) {
for nq := range s.cnq {
edge, err := nq.ToEdge(s.instanceIdx, s.numInstances)
for err != nil {
// Just put in a retry loop to tackle temporary errors.
if err == posting.E_TMP_ERROR {
time.Sleep(time.Microsecond)
} else {
glog.WithError(err).WithField("nq", nq).
Error("While converting to edge")
return
}
edge, err = nq.ToEdge(s.instanceIdx, s.numInstances)
}
// Only handle this edge if the attribute satisfies the modulo rule
if farm.Fingerprint64([]byte(edge.Attribute))%s.numInstances ==
s.instanceIdx {
key := posting.Key(edge.Entity, edge.Attribute)
plist := posting.GetOrCreate(key, dataStore)
plist.AddMutation(edge, posting.Set)
atomic.AddUint64(&s.ctr.processed, 1)
} else {
atomic.AddUint64(&s.ctr.ignored, 1)
}
}
wg.Done()
}
func (s *state) handleNQuads(wg *sync.WaitGroup) {
for nq := range s.cnq {
if farm.Fingerprint64([]byte(nq.Subject))%s.mod != 0 {
// Ignore due to mod sampling.
atomic.AddUint64(&s.ctr.ignored, 1)
continue
}
edge, err := nq.ToEdge()
for err != nil {
// Just put in a retry loop to tackle temporary errors.
if err == posting.E_TMP_ERROR {
time.Sleep(time.Microsecond)
} else {
glog.WithError(err).WithField("nq", nq).
Error("While converting to edge")
return
}
edge, err = nq.ToEdge()
}
key := posting.Key(edge.Entity, edge.Attribute)
plist := posting.GetOrCreate(key)
plist.AddMutation(edge, posting.Set)
atomic.AddUint64(&s.ctr.processed, 1)
}
wg.Done()
}
func ProcessTask(query []byte) (result []byte, rerr error) {
uo := flatbuffers.GetUOffsetT(query)
q := new(task.Query)
q.Init(query, uo)
b := flatbuffers.NewBuilder(0)
voffsets := make([]flatbuffers.UOffsetT, q.UidsLength())
uoffsets := make([]flatbuffers.UOffsetT, q.UidsLength())
attr := string(q.Attr())
for i := 0; i < q.UidsLength(); i++ {
uid := q.Uids(i)
key := posting.Key(uid, attr)
pl := posting.GetOrCreate(key, dataStore)
var valoffset flatbuffers.UOffsetT
if val, err := pl.Value(); err != nil {
valoffset = b.CreateByteVector(x.Nilbyte)
} else {
valoffset = b.CreateByteVector(val)
}
task.ValueStart(b)
task.ValueAddVal(b, valoffset)
voffsets[i] = task.ValueEnd(b)
ulist := pl.GetUids()
uoffsets[i] = x.UidlistOffset(b, ulist)
}
task.ResultStartValuesVector(b, len(voffsets))
for i := len(voffsets) - 1; i >= 0; i-- {
b.PrependUOffsetT(voffsets[i])
}
valuesVent := b.EndVector(len(voffsets))
task.ResultStartUidmatrixVector(b, len(uoffsets))
for i := len(uoffsets) - 1; i >= 0; i-- {
b.PrependUOffsetT(uoffsets[i])
}
matrixVent := b.EndVector(len(uoffsets))
task.ResultStart(b)
task.ResultAddValues(b, valuesVent)
task.ResultAddUidmatrix(b, matrixVent)
rend := task.ResultEnd(b)
b.Finish(rend)
return b.Bytes[b.Head():], nil
}
func allocateUniqueUid(xid string, instanceIdx uint64,
numInstances uint64) (uid uint64, rerr error) {
mod := math.MaxUint64 / numInstances
minIdx := instanceIdx * mod
for sp := ""; ; sp += " " {
txid := xid + sp
uid1 := farm.Fingerprint64([]byte(txid)) // Generate from hash.
uid = (uid1 % mod) + minIdx
glog.WithField("txid", txid).WithField("uid", uid).Debug("Generated")
if uid == math.MaxUint64 {
glog.Debug("Hit uint64max while generating fingerprint. Ignoring...")
continue
}
// Check if this uid has already been allocated.
key := posting.Key(uid, "_xid_") // uid -> "_xid_" -> xid
pl := posting.GetOrCreate(key, uidStore)
if pl.Length() > 0 {
// Something already present here.
var p types.Posting
pl.Get(&p, 0)
var tmp interface{}
posting.ParseValue(&tmp, p.ValueBytes())
glog.Debug("Found existing xid: [%q]. Continuing...", tmp.(string))
continue
}
// Uid hasn't been assigned yet.
t := x.DirectedEdge{
Value: xid, // not txid
Source: "_assigner_",
Timestamp: time.Now(),
}
rerr = pl.AddMutation(t, posting.Set)
if rerr != nil {
glog.WithError(rerr).Error("While adding mutation")
}
return uid, rerr
}
return 0, errors.New("Some unhandled route lead me here." +
" Wake the stupid developer up.")
}
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()
posting.Init(clog)
Init(ps)
edge := x.DirectedEdge{
ValueId: 23,
Source: "author0",
Timestamp: time.Now(),
}
addEdge(t, edge, posting.GetOrCreate(posting.Key(10, "friend"), ps))
addEdge(t, edge, posting.GetOrCreate(posting.Key(11, "friend"), ps))
addEdge(t, edge, posting.GetOrCreate(posting.Key(12, "friend"), ps))
edge.ValueId = 25
addEdge(t, edge, posting.GetOrCreate(posting.Key(12, "friend"), ps))
edge.ValueId = 26
addEdge(t, edge, posting.GetOrCreate(posting.Key(12, "friend"), ps))
edge.ValueId = 31
addEdge(t, edge, posting.GetOrCreate(posting.Key(10, "friend"), ps))
addEdge(t, edge, posting.GetOrCreate(posting.Key(12, "friend"), ps))
edge.Value = "photon"
addEdge(t, edge, posting.GetOrCreate(posting.Key(12, "friend"), ps))
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 := posting.ParseValue(&iout, tval.ValBytes()); err != nil {
t.Error(err)
}
v := iout.(string)
if v != "photon" {
t.Errorf("Expected photon. Got: %q", v)
}
}
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
}