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package revisions
import (
"github.com/authzed/spicedb/pkg/datastore"
"github.com/authzed/spicedb/pkg/spiceerrors"
)
// RevisionKind is an enum of the different kinds of revisions that can be used.
type RevisionKind string
const (
// Timestamp is a revision that is a timestamp.
Timestamp RevisionKind = "timestamp"
// TransactionID is a revision that is a transaction ID.
TransactionID = "txid"
// HybridLogicalClock is a revision that is a hybrid logical clock.
HybridLogicalClock = "hlc"
)
// ParsingFunc is a function that can parse a string into a revision.
type ParsingFunc func(revisionStr string) (rev datastore.Revision, err error)
// RevisionParser returns a ParsingFunc for the given RevisionKind.
func RevisionParser(kind RevisionKind) ParsingFunc {
switch kind {
case TransactionID:
return parseTransactionIDRevisionString
case Timestamp:
return parseTimestampRevisionString
case HybridLogicalClock:
return parseHLCRevisionString
default:
return func(revisionStr string) (rev datastore.Revision, err error) {
return nil, spiceerrors.MustBugf("unknown revision kind: %v", kind)
}
}
}
// CommonDecoder is a revision decoder that can decode revisions of a given kind.
type CommonDecoder struct {
Kind RevisionKind
}
func (cd CommonDecoder) RevisionFromString(s string) (datastore.Revision, error) {
switch cd.Kind {
case TransactionID:
return parseTransactionIDRevisionString(s)
case Timestamp:
return parseTimestampRevisionString(s)
case HybridLogicalClock:
return parseHLCRevisionString(s)
default:
return nil, spiceerrors.MustBugf("unknown revision kind in decoder: %v", cd.Kind)
}
}
// WithInexactFloat64 is an interface that can be implemented by a revision to
// provide an inexact float64 representation of the revision.
type WithInexactFloat64 interface {
// InexactFloat64 returns a float64 that is an inexact representation of the
// revision.
InexactFloat64() float64
}
// WithTimestampRevision is an interface that can be implemented by a revision to
// provide a timestamp.
type WithTimestampRevision interface {
datastore.Revision
TimestampNanoSec() int64
ConstructForTimestamp(timestampNanoSec int64) WithTimestampRevision
}
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