func NewGraph(euid uint64, exid string) (*SubGraph, error) {
// This would set the Result field in SubGraph,
// and populate the children for attributes.
if len(exid) > 0 {
u, err := uid.GetOrAssign(exid)
if err != nil {
x.Err(glog, err).WithField("xid", exid).Error(
"While GetOrAssign uid from external id")
return nil, err
}
glog.WithField("xid", exid).WithField("_uid_", u).Debug("GetOrAssign")
euid = u
}
if euid == 0 {
err := fmt.Errorf("Query internal id is zero")
x.Err(glog, err).Error("Invalid query")
return nil, err
}
// Encode uid into result flatbuffer.
b := flatbuffers.NewBuilder(0)
omatrix := x.UidlistOffset(b, []uint64{euid})
// Also need to add nil value to keep this consistent.
var voffset flatbuffers.UOffsetT
{
bvo := b.CreateByteVector(x.Nilbyte)
task.ValueStart(b)
task.ValueAddVal(b, bvo)
voffset = task.ValueEnd(b)
}
task.ResultStartUidmatrixVector(b, 1)
b.PrependUOffsetT(omatrix)
mend := b.EndVector(1)
task.ResultStartValuesVector(b, 1)
b.PrependUOffsetT(voffset)
vend := b.EndVector(1)
task.ResultStart(b)
task.ResultAddUidmatrix(b, mend)
task.ResultAddValues(b, vend)
rend := task.ResultEnd(b)
b.Finish(rend)
sg := new(SubGraph)
sg.Attr = "_root_"
sg.result = b.Bytes[b.Head():]
// Also add query for consistency and to allow for ToJson() later.
sg.query = createTaskQuery(sg.Attr, []uint64{euid})
return sg, nil
}
func GetUid(s string, instanceIdx uint64, numInstances uint64) (uint64, error) {
if strings.HasPrefix(s, "_uid_:") {
return strconv.ParseUint(s[6:], 0, 64)
}
return uid.GetOrAssign(s, instanceIdx, numInstances)
}
func getUid(s string) (uint64, error) {
if strings.HasPrefix(s, "_uid_:") {
return strconv.ParseUint(s[6:], 0, 64)
}
return uid.GetOrAssign(s)
}