session_back.go RawHistoryFolder

1package daemon
2
3import (
4	"github.com/bnema/vev/internal/domain"
5	"github.com/bnema/vev/internal/ports"
6)
7
8// backSessionForAttachment delegates previous-route ownership to the client
9// once it has published a complete route snapshot. There is no daemon-local
10// previous-session fallback after the global-history cutover.
11func (d *Daemon) backSessionForAttachment(token attachmentConnectionToken) error {
12	if d == nil || token.sess == nil || token.ac == nil {
13		return nil
14	}
15	snapshot := token.ac.routeSnapshotCopy()
16	if snapshot.Generation == 0 {
17		if d.log != nil {
18			d.log.Debug("back-session skipped: attachment has no published route snapshot")
19		}
20		return nil
21	}
22	if snapshot.Previous.Key == 0 || snapshot.Previous.Generation == 0 {
23		return nil
24	}
25	return d.sendRecentRouteNavigationActionForAttachment(token, ports.RouteNavigationAction{
26		SnapshotGeneration: snapshot.Generation,
27		Key:                snapshot.Previous.Key,
28		Generation:         snapshot.Previous.Generation,
29	})
30}
31
32func (d *Daemon) backSession(current *session, ac *attachedClient) {
33	if d == nil || current == nil || ac == nil {
34		return
35	}
36	token := attachmentToken(current, ac, ac.transport())
37	effect, admitted := ac.beginAttachmentEffect(token)
38	if !admitted {
39		d.reportError(current, domain.UserErr(domain.NoticeSessionUnavailable, "couldn't switch to that session", errAttachmentTransition))
40		return
41	}
42	token.effect = effect
43	defer effect.End()
44	if err := d.backSessionForAttachment(token); err != nil {
45		d.reportError(current, err)
46	}
47}