session_back.go RawHistoryFolder

1package daemon
2
3import (
4	"github.com/bnema/vev/internal/domain"
5	"github.com/bnema/vev/internal/protocol"
6)
7
8// backSessionForAttachment delegates previous-route ownership to the client
9// once it has published a complete route snapshot. A live route on the current
10// daemon uses the authenticated same-peer path; all other routes return to the
11// client for close-and-dial navigation.
12func (d *Daemon) backSessionForAttachment(effect *attachmentEffect) error {
13	if d == nil || !effect.current() || effect.sess == nil || effect.ac == nil {
14		return nil
15	}
16	snapshot := effect.ac.routeSnapshotCopy()
17	if snapshot.Generation == 0 {
18		if d.log != nil {
19			d.log.Debug("back-session skipped: attachment has no published route snapshot")
20		}
21		return nil
22	}
23	if snapshot.Previous.Key == 0 || snapshot.Previous.Generation == 0 {
24		return nil
25	}
26	if subscribed, ok := effect.ac.routeAttentionTarget(snapshot.Previous); ok && subscribed.SourceKey == "" {
27		target := subscribed.Target
28		targetSession, _, live := d.samePeerTarget(protocol.SamePeerSwitchRequest{Target: target})
29		if live && targetSession != effect.sess {
30			return offerSamePeerAttachTarget(effect, target)
31		}
32	}
33	return d.sendRecentRouteNavigationActionForAttachment(effect, protocol.RouteNavigationAction{
34		SnapshotGeneration: snapshot.Generation,
35		Key:                snapshot.Previous.Key,
36		Generation:         snapshot.Previous.Generation,
37	})
38}
39
40func (d *Daemon) backSession(current *session, ac *attachedClient) {
41	if d == nil || current == nil || ac == nil {
42		return
43	}
44	token := captureAttachmentCapability(current, ac, ac.transport())
45	effect, admitted := ac.beginAttachmentEffect(token)
46	if !admitted {
47		d.reportError(current, domain.UserErr(domain.NoticeSessionUnavailable, "couldn't switch to that session", errAttachmentTransition))
48		return
49	}
50	defer effect.End()
51	if err := d.backSessionForAttachment(effect); err != nil {
52		d.reportError(current, err)
53	}
54}