tsd: wire up the event bus to tailscaled

Updates #15160

Signed-off-by: David Anderson <dave@tailscale.com>

cmd/k8s-operator/depaware.txt

@@ -82,6 +82,10 @@ tailscale.com/cmd/k8s-operator dependencies: (generated by github.com/tailscale/
    L    github.com/aws/smithy-go/waiter                              from github.com/aws/aws-sdk-go-v2/service/ssm
         github.com/beorn7/perks/quantile                             from github.com/prometheus/client_golang/prometheus
      💣 github.com/cespare/xxhash/v2                                 from github.com/prometheus/client_golang/prometheus
+        github.com/coder/websocket                                   from tailscale.com/util/eventbus
+        github.com/coder/websocket/internal/errd                     from github.com/coder/websocket
+        github.com/coder/websocket/internal/util                     from github.com/coder/websocket
+        github.com/coder/websocket/internal/xsync                    from github.com/coder/websocket
    L    github.com/coreos/go-iptables/iptables                       from tailscale.com/util/linuxfw
      💣 github.com/davecgh/go-spew/spew                              from k8s.io/apimachinery/pkg/util/dump
    W 💣 github.com/dblohm7/wingoes                                   from github.com/dblohm7/wingoes/com+
@@ -902,7 +906,8 @@ tailscale.com/cmd/k8s-operator dependencies: (generated by github.com/tailscale/
         tailscale.com/tstime                                         from tailscale.com/cmd/k8s-operator+
         tailscale.com/tstime/mono                                    from tailscale.com/net/tstun+
         tailscale.com/tstime/rate                                    from tailscale.com/derp+
-        tailscale.com/tsweb/varz                                     from tailscale.com/util/usermetric
+        tailscale.com/tsweb                                          from tailscale.com/util/eventbus
+        tailscale.com/tsweb/varz                                     from tailscale.com/util/usermetric+
         tailscale.com/types/appctype                                 from tailscale.com/ipn/ipnlocal
         tailscale.com/types/bools                                    from tailscale.com/tsnet
         tailscale.com/types/dnstype                                  from tailscale.com/ipn/ipnlocal+
@@ -931,6 +936,7 @@ tailscale.com/cmd/k8s-operator dependencies: (generated by github.com/tailscale/
      💣 tailscale.com/util/deephash                                  from tailscale.com/ipn/ipnlocal+
    L 💣 tailscale.com/util/dirwalk                                   from tailscale.com/metrics+
         tailscale.com/util/dnsname                                   from tailscale.com/appc+
+        tailscale.com/util/eventbus                                  from tailscale.com/tsd
         tailscale.com/util/execqueue                                 from tailscale.com/appc+
         tailscale.com/util/goroutines                                from tailscale.com/ipn/ipnlocal
         tailscale.com/util/groupmember                               from tailscale.com/client/web+
@@ -1148,7 +1154,7 @@ tailscale.com/cmd/k8s-operator dependencies: (generated by github.com/tailscale/
         hash/fnv                                                     from google.golang.org/protobuf/internal/detrand
         hash/maphash                                                 from go4.org/mem
         html                                                         from html/template+
-        html/template                                                from github.com/gorilla/csrf
+        html/template                                                from github.com/gorilla/csrf+
         internal/abi                                                 from crypto/x509/internal/macos+
         internal/asan                                                from internal/runtime/maps+
         internal/bisect                                              from internal/godebug

cmd/tailscaled/depaware.txt

@@ -81,6 +81,10 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
    L    github.com/aws/smithy-go/transport/http                      from github.com/aws/aws-sdk-go-v2/aws/middleware+
    L    github.com/aws/smithy-go/transport/http/internal/io          from github.com/aws/smithy-go/transport/http
    L    github.com/aws/smithy-go/waiter                              from github.com/aws/aws-sdk-go-v2/service/ssm
+        github.com/coder/websocket                                   from tailscale.com/util/eventbus
+        github.com/coder/websocket/internal/errd                     from github.com/coder/websocket
+        github.com/coder/websocket/internal/util                     from github.com/coder/websocket
+        github.com/coder/websocket/internal/xsync                    from github.com/coder/websocket
    L    github.com/coreos/go-iptables/iptables                       from tailscale.com/util/linuxfw
   LD 💣 github.com/creack/pty                                        from tailscale.com/ssh/tailssh
    W 💣 github.com/dblohm7/wingoes                                   from github.com/dblohm7/wingoes/com+
@@ -353,6 +357,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         tailscale.com/tstime                                         from tailscale.com/control/controlclient+
         tailscale.com/tstime/mono                                    from tailscale.com/net/tstun+
         tailscale.com/tstime/rate                                    from tailscale.com/derp+
+        tailscale.com/tsweb                                          from tailscale.com/util/eventbus
         tailscale.com/tsweb/varz                                     from tailscale.com/cmd/tailscaled+
         tailscale.com/types/appctype                                 from tailscale.com/ipn/ipnlocal
         tailscale.com/types/dnstype                                  from tailscale.com/ipn/ipnlocal+
@@ -382,6 +387,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
      💣 tailscale.com/util/deephash                                  from tailscale.com/ipn/ipnlocal+
    L 💣 tailscale.com/util/dirwalk                                   from tailscale.com/metrics+
         tailscale.com/util/dnsname                                   from tailscale.com/appc+
+        tailscale.com/util/eventbus                                  from tailscale.com/cmd/tailscaled+
         tailscale.com/util/execqueue                                 from tailscale.com/control/controlclient+
         tailscale.com/util/goroutines                                from tailscale.com/ipn/ipnlocal
         tailscale.com/util/groupmember                               from tailscale.com/client/web+
@@ -587,7 +593,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         hash/crc32                                                   from compress/gzip+
         hash/maphash                                                 from go4.org/mem
         html                                                         from html/template+
-        html/template                                                from github.com/gorilla/csrf
+        html/template                                                from github.com/gorilla/csrf+
         internal/abi                                                 from crypto/x509/internal/macos+
         internal/asan                                                from internal/runtime/maps+
         internal/bisect                                              from internal/godebug

cmd/tailscaled/tailscaled.go

@@ -62,6 +62,7 @@ import (
 	"tailscale.com/types/logger"
 	"tailscale.com/types/logid"
 	"tailscale.com/util/clientmetric"
+	"tailscale.com/util/eventbus"
 	"tailscale.com/util/multierr"
 	"tailscale.com/util/osshare"
 	"tailscale.com/version"
@@ -359,6 +360,10 @@ func run() (err error) {
 
 	sys := new(tsd.System)
 
+	// Install an event bus as early as possible, so that it's
+	// available universally when setting up everything else.
+	sys.Set(eventbus.New())
+
 	// Parse config, if specified, to fail early if it's invalid.
 	var conf *conffile.Config
 	if args.confFile != "" {

tsd/tsd.go

@@ -33,6 +33,7 @@ import (
 	"tailscale.com/net/tstun"
 	"tailscale.com/proxymap"
 	"tailscale.com/types/netmap"
+	"tailscale.com/util/eventbus"
 	"tailscale.com/util/usermetric"
 	"tailscale.com/wgengine"
 	"tailscale.com/wgengine/magicsock"
@@ -41,6 +42,7 @@ import (
 
 // System contains all the subsystems of a Tailscale node (tailscaled, etc.)
 type System struct {
+	Bus            SubSystem[*eventbus.Bus]
 	Dialer         SubSystem[*tsdial.Dialer]
 	DNSManager     SubSystem[*dns.Manager] // can get its *resolver.Resolver from DNSManager.Resolver
 	Engine         SubSystem[wgengine.Engine]
@@ -84,6 +86,8 @@ type NetstackImpl interface {
 // has already been set.
 func (s *System) Set(v any) {
 	switch v := v.(type) {
+	case *eventbus.Bus:
+		s.Bus.Set(v)
 	case *netmon.Monitor:
 		s.NetMon.Set(v)
 	case *dns.Manager:

tstest/integration/tailscaled_deps_test_darwin.go

@@ -48,6 +48,7 @@ import (
 	_ "tailscale.com/types/logger"
 	_ "tailscale.com/types/logid"
 	_ "tailscale.com/util/clientmetric"
+	_ "tailscale.com/util/eventbus"
 	_ "tailscale.com/util/multierr"
 	_ "tailscale.com/util/osshare"
 	_ "tailscale.com/version"

tstest/integration/tailscaled_deps_test_freebsd.go

@@ -48,6 +48,7 @@ import (
 	_ "tailscale.com/types/logger"
 	_ "tailscale.com/types/logid"
 	_ "tailscale.com/util/clientmetric"
+	_ "tailscale.com/util/eventbus"
 	_ "tailscale.com/util/multierr"
 	_ "tailscale.com/util/osshare"
 	_ "tailscale.com/version"

tstest/integration/tailscaled_deps_test_linux.go

@@ -48,6 +48,7 @@ import (
 	_ "tailscale.com/types/logger"
 	_ "tailscale.com/types/logid"
 	_ "tailscale.com/util/clientmetric"
+	_ "tailscale.com/util/eventbus"
 	_ "tailscale.com/util/multierr"
 	_ "tailscale.com/util/osshare"
 	_ "tailscale.com/version"

tstest/integration/tailscaled_deps_test_openbsd.go

@@ -48,6 +48,7 @@ import (
 	_ "tailscale.com/types/logger"
 	_ "tailscale.com/types/logid"
 	_ "tailscale.com/util/clientmetric"
+	_ "tailscale.com/util/eventbus"
 	_ "tailscale.com/util/multierr"
 	_ "tailscale.com/util/osshare"
 	_ "tailscale.com/version"

tstest/integration/tailscaled_deps_test_windows.go

@@ -57,6 +57,7 @@ import (
 	_ "tailscale.com/types/logger"
 	_ "tailscale.com/types/logid"
 	_ "tailscale.com/util/clientmetric"
+	_ "tailscale.com/util/eventbus"
 	_ "tailscale.com/util/multierr"
 	_ "tailscale.com/util/osdiag"
 	_ "tailscale.com/util/osshare"

tsweb/pprof_default.go

@@ -1,7 +1,7 @@
 // Copyright (c) Tailscale Inc & AUTHORS
 // SPDX-License-Identifier: BSD-3-Clause
 
-//go:build !js
+//go:build !js && !wasm
 
 package tsweb
 

tsweb/pprof_js.go

@@ -1,6 +1,8 @@
 // Copyright (c) Tailscale Inc & AUTHORS
 // SPDX-License-Identifier: BSD-3-Clause
 
+//go:build js && wasm
+
 package tsweb
 
 func addProfilingHandlers(d *DebugHandler) {