func silenceSetTimeRange(sil *pb.Silence, now, start, end *timestamp.Timestamp) (*pb.Silence, error) {
if protoBefore(end, start) {
return nil, fmt.Errorf("end time must not be before start time")
}
// Validate modification based on current silence state.
switch getState(sil, now) {
case StateActive:
if *start != *sil.StartsAt {
return nil, fmt.Errorf("start time of active silence cannot be modified")
}
if protoBefore(end, now) {
return nil, fmt.Errorf("end time cannot be set into the past")
}
case StatePending:
if protoBefore(start, now) {
return nil, fmt.Errorf("start time cannot be set into the past")
}
case StateExpired:
return nil, fmt.Errorf("expired silence must not be modified")
default:
panic("unknown silence state")
}
sil = cloneSilence(sil)
sil.StartsAt = start
sil.EndsAt = end
sil.UpdatedAt = now
return sil, nil
}
