// unmarshalFact decodes a fact from it's binary representation. The domain and
// transaction ID are passed in since they are not encoded with the fact itself.
// This is because facts are stored relative to a domain and a transaction.
func unmarshalFact(m *ProtoFact, b []byte, d string, t uint64, f *origins.Fact) error {
m.Reset()
if err := proto.Unmarshal(b, m); err != nil {
return err
}
f.Domain = d
f.Transaction = t
f.Entity = &origins.Ident{
Domain: m.GetEntityDomain(),
Name: m.GetEntity(),
}
f.Attribute = &origins.Ident{
Domain: m.GetAttributeDomain(),
Name: m.GetAttribute(),
}
f.Value = &origins.Ident{
Domain: m.GetValueDomain(),
Name: m.GetValue(),
}
f.Time = chrono.MicroTime(m.GetTime())
if m.GetAdded() {
f.Operation = origins.Assertion
} else {
f.Operation = origins.Retraction
}
return nil
}
// defaults fills in the default values for the fact.
func (tx *Transaction) defaults(f *origins.Fact) error {
if f.Domain == "" {
if tx.options.DefaultDomain == "" {
return ErrNoDomain
}
f.Domain = tx.options.DefaultDomain
}
// Default to fact domain.
if f.Entity.Domain == "" {
f.Entity.Domain = f.Domain
}
if f.Attribute.Domain == "" {
f.Attribute.Domain = f.Domain
}
// Set fact time to the transaction time if flagged to do so.
if f.Time.IsZero() && tx.options.SetDefaultTime {
f.Time = tx.StartTime
}
return nil
}