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ipn, ipn/ipnlocal: add session identifier for WatchIPNBus

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This PR adds a SessionID field to the ipn.Notify struct so that
ipn buses can identify a session and register deferred clean up
code in the future. The first use case this is for is to be able to
tie foreground serve configs to a specific watch session and ensure
its clean up when a connection is closed.

Updates #8489

Signed-off-by: Marwan Sulaiman <marwan@tailscale.com>
This commit is contained in:
Marwan Sulaiman 2023-08-31 17:43:54 +01:00 committed by Marwan Sulaiman
parent 7175f06e62
commit a4aa6507fa
3 changed files with 13 additions and 2 deletions
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2
cmd/tailscaled/depaware.txt
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@ -343,7 +343,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/util/osshare from tailscale.com/ipn/ipnlocal+
W tailscale.com/util/pidowner from tailscale.com/ipn/ipnauth
tailscale.com/util/racebuild from tailscale.com/logpolicy
tailscale.com/util/rands from tailscale.com/ipn/localapi
tailscale.com/util/rands from tailscale.com/ipn/localapi+
tailscale.com/util/ringbuffer from tailscale.com/wgengine/magicsock
tailscale.com/util/set from tailscale.com/health+
tailscale.com/util/singleflight from tailscale.com/control/controlclient+

8
ipn/backend.go
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@ -61,7 +61,7 @@ type EngineStatus struct {
// each one via RequestEngineStatus.
NotifyWatchEngineUpdates NotifyWatchOpt = 1 << iota
NotifyInitialState // if set, the first Notify message (sent immediately) will contain the current State + BrowseToURL
NotifyInitialState // if set, the first Notify message (sent immediately) will contain the current State + BrowseToURL + SessionID
NotifyInitialPrefs // if set, the first Notify message (sent immediately) will contain the current Prefs
NotifyInitialNetMap // if set, the first Notify message (sent immediately) will contain the current NetMap
@ -77,6 +77,12 @@ type Notify struct {
_ structs.Incomparable
Version string // version number of IPN backend
// SessionID identifies the unique WatchIPNBus session.
// This field is only set in the first message when requesting
// NotifyInitialState. Clients must store it on their side as
// following notifications will not include this field.
SessionID string `json:",omitempty"`
// ErrMessage, if non-nil, contains a critical error message.
// For State InUseOtherUser, ErrMessage is not critical and just contains the details.
ErrMessage *string

5
ipn/ipnlocal/local.go
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@ -78,6 +78,7 @@
"tailscale.com/util/mak"
"tailscale.com/util/multierr"
"tailscale.com/util/osshare"
"tailscale.com/util/rands"
"tailscale.com/util/set"
"tailscale.com/util/systemd"
"tailscale.com/util/testenv"
@ -1935,6 +1936,8 @@ func (b *LocalBackend) ResendHostinfoIfNeeded() {
func (b *LocalBackend) WatchNotifications(ctx context.Context, mask ipn.NotifyWatchOpt, onWatchAdded func(), fn func(roNotify *ipn.Notify) (keepGoing bool)) {
ch := make(chan *ipn.Notify, 128)
sessionID := rands.HexString(16)
origFn := fn
if mask&ipn.NotifyNoPrivateKeys != 0 {
fn = func(n *ipn.Notify) bool {
@ -1956,10 +1959,12 @@ func (b *LocalBackend) WatchNotifications(ctx context.Context, mask ipn.NotifyWa
var ini *ipn.Notify
b.mu.Lock()
const initialBits = ipn.NotifyInitialState | ipn.NotifyInitialPrefs | ipn.NotifyInitialNetMap
if mask&initialBits != 0 {
ini = &ipn.Notify{Version: version.Long()}
if mask&ipn.NotifyInitialState != 0 {
ini.SessionID = sessionID
ini.State = ptr.To(b.state)
if b.state == ipn.NeedsLogin {
ini.BrowseToURL = ptr.To(b.authURLSticky)