control/controlclient: plumb health.Tracker

Updates #11874
Updates #4136

Change-Id: Ia941153bd83523f0c8b56852010f5231d774d91a
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

control/controlclient/auto.go

@@ -12,7 +12,6 @@
 	"sync/atomic"
 	"time"
 
-	"tailscale.com/health"
 	"tailscale.com/logtail/backoff"
 	"tailscale.com/net/sockstats"
 	"tailscale.com/tailcfg"
@@ -195,7 +194,7 @@ func NewNoStart(opts Options) (_ *Auto, err error) {
 	c.mapCtx, c.mapCancel = context.WithCancel(context.Background())
 	c.mapCtx = sockstats.WithSockStats(c.mapCtx, sockstats.LabelControlClientAuto, opts.Logf)
 
-	c.unregisterHealthWatch = health.Global.RegisterWatcher(direct.ReportHealthChange)
+	c.unregisterHealthWatch = opts.HealthTracker.RegisterWatcher(direct.ReportHealthChange)
 	return c, nil
 
 }
@@ -316,7 +315,7 @@ func (c *Auto) authRoutine() {
 		}
 
 		if goal == nil {
-			health.Global.SetAuthRoutineInError(nil)
+			c.direct.health.SetAuthRoutineInError(nil)
 			// Wait for user to Login or Logout.
 			<-ctx.Done()
 			c.logf("[v1] authRoutine: context done.")
@@ -343,7 +342,7 @@ func (c *Auto) authRoutine() {
 			f = "TryLogin"
 		}
 		if err != nil {
-			health.Global.SetAuthRoutineInError(err)
+			c.direct.health.SetAuthRoutineInError(err)
 			report(err, f)
 			bo.BackOff(ctx, err)
 			continue
@@ -373,7 +372,7 @@ func (c *Auto) authRoutine() {
 		}
 
 		// success
-		health.Global.SetAuthRoutineInError(nil)
+		c.direct.health.SetAuthRoutineInError(nil)
 		c.mu.Lock()
 		c.urlToVisit = ""
 		c.loggedIn = true
@@ -503,11 +502,11 @@ func (c *Auto) mapRoutine() {
 			c.logf("[v1] mapRoutine: context done.")
 			continue
 		}
-		health.Global.SetOutOfPollNetMap()
+		c.direct.health.SetOutOfPollNetMap()
 
 		err := c.direct.PollNetMap(ctx, mrs)
 
-		health.Global.SetOutOfPollNetMap()
+		c.direct.health.SetOutOfPollNetMap()
 		c.mu.Lock()
 		c.inMapPoll = false
 		if c.state == StateSynchronized {

control/controlclient/direct.go

@@ -69,6 +69,7 @@ type Direct struct {
 	clock                      tstime.Clock
 	logf                       logger.Logf
 	netMon                     *netmon.Monitor // or nil
+	health                     *health.Tracker
 	discoPubKey                key.DiscoPublic
 	getMachinePrivKey          func() (key.MachinePrivate, error)
 	debugFlags                 []string
@@ -119,10 +120,11 @@ type Options struct {
 	Hostinfo                   *tailcfg.Hostinfo // non-nil passes ownership, nil means to use default using os.Hostname, etc
 	DiscoPublicKey             key.DiscoPublic
 	Logf                       logger.Logf
-	HTTPTestClient             *http.Client                 // optional HTTP client to use (for tests only)
+	HTTPTestClient             *http.Client    // optional HTTP client to use (for tests only)
-	NoiseTestClient            *http.Client                 // optional HTTP client to use for noise RPCs (tests only)
+	NoiseTestClient            *http.Client    // optional HTTP client to use for noise RPCs (tests only)
-	DebugFlags                 []string                     // debug settings to send to control
+	DebugFlags                 []string        // debug settings to send to control
-	NetMon                     *netmon.Monitor              // optional network monitor
+	NetMon                     *netmon.Monitor // optional network monitor
+	HealthTracker              *health.Tracker
 	PopBrowserURL              func(url string)             // optional func to open browser
 	OnClientVersion            func(*tailcfg.ClientVersion) // optional func to inform GUI of client version status
 	OnControlTime              func(time.Time)              // optional func to notify callers of new time from control
@@ -248,7 +250,7 @@ func NewDirect(opts Options) (*Direct, error) {
 		tr := http.DefaultTransport.(*http.Transport).Clone()
 		tr.Proxy = tshttpproxy.ProxyFromEnvironment
 		tshttpproxy.SetTransportGetProxyConnectHeader(tr)
-		tr.TLSClientConfig = tlsdial.Config(serverURL.Hostname(), health.Global, tr.TLSClientConfig)
+		tr.TLSClientConfig = tlsdial.Config(serverURL.Hostname(), opts.HealthTracker, tr.TLSClientConfig)
 		tr.DialContext = dnscache.Dialer(opts.Dialer.SystemDial, dnsCache)
 		tr.DialTLSContext = dnscache.TLSDialer(opts.Dialer.SystemDial, dnsCache, tr.TLSClientConfig)
 		tr.ForceAttemptHTTP2 = true
@@ -271,6 +273,7 @@ func NewDirect(opts Options) (*Direct, error) {
 		discoPubKey:                opts.DiscoPublicKey,
 		debugFlags:                 opts.DebugFlags,
 		netMon:                     opts.NetMon,
+		health:                     opts.HealthTracker,
 		skipIPForwardingCheck:      opts.SkipIPForwardingCheck,
 		pinger:                     opts.Pinger,
 		popBrowser:                 opts.PopBrowserURL,
@@ -894,10 +897,10 @@ func (c *Direct) sendMapRequest(ctx context.Context, isStreaming bool, nu Netmap
 		ipForwardingBroken(hi.RoutableIPs, c.netMon.InterfaceState()) {
 		extraDebugFlags = append(extraDebugFlags, "warn-ip-forwarding-off")
 	}
-	if health.Global.RouterHealth() != nil {
+	if c.health.RouterHealth() != nil {
 		extraDebugFlags = append(extraDebugFlags, "warn-router-unhealthy")
 	}
-	extraDebugFlags = health.Global.AppendWarnableDebugFlags(extraDebugFlags)
+	extraDebugFlags = c.health.AppendWarnableDebugFlags(extraDebugFlags)
 	if hostinfo.DisabledEtcAptSource() {
 		extraDebugFlags = append(extraDebugFlags, "warn-etc-apt-source-disabled")
 	}
@@ -970,7 +973,7 @@ func (c *Direct) sendMapRequest(ctx context.Context, isStreaming bool, nu Netmap
 	}
 	defer res.Body.Close()
 
-	health.Global.NoteMapRequestHeard(request)
+	c.health.NoteMapRequestHeard(request)
 	watchdogTimer.Reset(watchdogTimeout)
 
 	if nu == nil {
@@ -1041,7 +1044,7 @@ func (c *Direct) sendMapRequest(ctx context.Context, isStreaming bool, nu Netmap
 		metricMapResponseMessages.Add(1)
 
 		if isStreaming {
-			health.Global.GotStreamedMapResponse()
+			c.health.GotStreamedMapResponse()
 		}
 
 		if pr := resp.PingRequest; pr != nil && c.isUniquePingRequest(pr) {

ipn/ipnlocal/local.go

@@ -1763,6 +1763,7 @@ func (b *LocalBackend) Start(opts ipn.Options) error {
 		DiscoPublicKey:             discoPublic,
 		DebugFlags:                 debugFlags,
 		NetMon:                     b.sys.NetMon.Get(),
+		HealthTracker:              b.health,
 		Pinger:                     b,
 		PopBrowserURL:              b.tellClientToBrowseToURL,
 		OnClientVersion:            b.onClientVersion,