Files
netbird/client/internal/dns/notifier.go
Zoltan Papp 6f42636514 [client] Android - Serialize Android tunnel reconfiguration callbacks (#6990)
## Describe your changes

The Android route notifier and the DNS search-domain notifier both
delivered OnNetworkChanged from a fire-and-forget goroutine per update.
Two updates in quick succession could reach the Java side reordered: the
TUN rebuild handler applies them in arrival order and compares against
the last applied parameters, so a stale route set delivered last won as
the final TUN state. This is the same reordering hazard fixed for iOS in
#6454.

Wrap the Android network change listener into the shared tunnelnotifier
FIFO introduced in #6870, the same way RunOniOS does, and deliver both
notifiers synchronously into it. Enqueueing is non-blocking, a single
delivery goroutine preserves order, and calls into Java never overlap.

Also stop hasRouteDiff from sorting the notifier's shared route slices
in place; compare sorted copies instead.

## Issue ticket number and link

## Stack

<!-- branch-stack -->

### Checklist
- [x] Is it a bug fix
- [ ] Is a typo/documentation fix
- [ ] Is a feature enhancement
- [ ] It is a refactor
- [ ] Created tests that fail without the change (if possible)
- [ ] This change does **not** modify the public API, gRPC protocols,
functionality behavior, CLI / service flags, or introduce a new feature
— **OR** I have discussed it with the NetBird team beforehand (link the
issue / Slack thread in the description). See
[CONTRIBUTING.md](https://github.com/netbirdio/netbird/blob/main/CONTRIBUTING.md#discuss-changes-with-the-netbird-team-first).

> By submitting this pull request, you confirm that you have read and
agree to the terms of the [Contributor License
Agreement](https://github.com/netbirdio/netbird/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT.md).

## Documentation
Select exactly one:

- [ ] I added/updated documentation for this change
- [x] Documentation is **not needed** for this change (explain why)

### Docs PR URL (required if "docs added" is checked)
Paste the PR link from https://github.com/netbirdio/docs here:

https://github.com/netbirdio/docs/pull/__
2026-08-03 15:03:15 +02:00

56 lines
1018 B
Go

package dns
import (
"reflect"
"sort"
"sync"
"github.com/netbirdio/netbird/client/internal/listener"
)
type notifier struct {
listener listener.NetworkChangeListener
listenerMux sync.Mutex
searchDomains []string
}
func newNotifier(initialSearchDomains []string) *notifier {
sort.Strings(initialSearchDomains)
return &notifier{
searchDomains: initialSearchDomains,
}
}
func (n *notifier) setListener(listener listener.NetworkChangeListener) {
n.listenerMux.Lock()
defer n.listenerMux.Unlock()
n.listener = listener
}
func (n *notifier) onNewSearchDomains(searchDomains []string) {
sort.Strings(searchDomains)
if len(n.searchDomains) != len(searchDomains) {
n.searchDomains = searchDomains
n.notify()
return
}
if reflect.DeepEqual(n.searchDomains, searchDomains) {
return
}
n.searchDomains = searchDomains
n.notify()
}
func (n *notifier) notify() {
n.listenerMux.Lock()
defer n.listenerMux.Unlock()
if n.listener == nil {
return
}
n.listener.OnNetworkChanged("")
}