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Replace the timestamp based state system

Browse source 
This commit replaces the timestamp based state system with a new
one that has update channels directly to the connected nodes. It
will send an update to all listening clients via the polling
mechanism.

It introduces a new package notifier, which has a concurrency safe
manager for all our channels to the connected nodes.

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>
This commit is contained in:
Kristoffer Dalby 2023-06-21 11:29:52 +02:00 committed by Kristoffer Dalby
parent 056d3a81c5
commit 66ff1fcd40
13 changed files with 216 additions and 731 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

108
hscontrol/app.go
View file

@ -10,7 +10,6 @@ import (
"net/http"
"os"
"os/signal"
"sort"
"strconv"
"strings"
"sync"
@ -26,13 +25,13 @@ import (
"github.com/juanfont/headscale/hscontrol/db"
"github.com/juanfont/headscale/hscontrol/derp"
derpServer "github.com/juanfont/headscale/hscontrol/derp/server"
"github.com/juanfont/headscale/hscontrol/notifier"
"github.com/juanfont/headscale/hscontrol/policy"
"github.com/juanfont/headscale/hscontrol/types"
"github.com/juanfont/headscale/hscontrol/util"
"github.com/patrickmn/go-cache"
zerolog "github.com/philip-bui/grpc-zerolog"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/puzpuzpuz/xsync/v2"
zl "github.com/rs/zerolog"
"github.com/rs/zerolog/log"
"golang.org/x/crypto/acme"
@ -84,7 +83,7 @@ type Headscale struct {
ACLPolicy *policy.ACLPolicy
lastStateChange *xsync.MapOf[string, time.Time]
nodeNotifier *notifier.Notifier
oidcProvider *oidc.Provider
oauth2Config *oauth2.Config
@ -93,9 +92,6 @@ type Headscale struct {
shutdownChan chan struct{}
pollNetMapStreamWG sync.WaitGroup
stateUpdateChan chan struct{}
cancelStateUpdateChan chan struct{}
}
func NewHeadscale(cfg *types.Config) (*Headscale, error) {
@ -158,19 +154,14 @@ func NewHeadscale(cfg *types.Config) (*Headscale, error) {
noisePrivateKey: noisePrivateKey,
registrationCache: registrationCache,
pollNetMapStreamWG: sync.WaitGroup{},
lastStateChange: xsync.NewMapOf[time.Time](),
stateUpdateChan: make(chan struct{}),
cancelStateUpdateChan: make(chan struct{}),
nodeNotifier: notifier.NewNotifier(),
}
go app.watchStateChannel()
database, err := db.NewHeadscaleDatabase(
cfg.DBtype,
dbString,
app.dbDebug,
app.stateUpdateChan,
app.nodeNotifier,
cfg.IPPrefixes,
cfg.BaseDomain)
if err != nil {
@ -203,7 +194,11 @@ func NewHeadscale(cfg *types.Config) (*Headscale, error) {
if cfg.DERP.ServerEnabled {
// TODO(kradalby): replace this key with a dedicated DERP key.
embeddedDERPServer, err := derpServer.NewDERPServer(cfg.ServerURL, key.NodePrivate(*privateKey), &cfg.DERP)
embeddedDERPServer, err := derpServer.NewDERPServer(
cfg.ServerURL,
key.NodePrivate(*privateKey),
&cfg.DERP,
)
if err != nil {
return nil, err
}
@ -230,10 +225,14 @@ func (h *Headscale) expireEphemeralNodes(milliSeconds int64) {
// expireExpiredMachines expires machines that have an explicit expiry set
// after that expiry time has passed.
func (h *Headscale) expireExpiredMachines(milliSeconds int64) {
ticker := time.NewTicker(time.Duration(milliSeconds) * time.Millisecond)
func (h *Headscale) expireExpiredMachines(intervalMs int64) {
interval := time.Duration(intervalMs) * time.Millisecond
ticker := time.NewTicker(interval)
lastCheck := time.Unix(0, 0)
for range ticker.C {
h.db.ExpireExpiredMachines(h.getLastStateChange())
lastCheck = h.db.ExpireExpiredMachines(lastCheck)
}
}
@ -258,7 +257,7 @@ func (h *Headscale) scheduledDERPMapUpdateWorker(cancelChan <-chan struct{}) {
h.DERPMap.Regions[region.RegionID] = &region
}
h.setLastStateChangeToNow()
h.nodeNotifier.NotifyAll()
}
}
}
@ -722,7 +721,7 @@ func (h *Headscale) Serve() error {
Str("path", aclPath).
Msg("ACL policy successfully reloaded, notifying nodes of change")
h.setLastStateChangeToNow()
h.nodeNotifier.NotifyAll()
}
default:
@ -760,10 +759,6 @@ func (h *Headscale) Serve() error {
// Stop listening (and unlink the socket if unix type):
socketListener.Close()
<-h.cancelStateUpdateChan
close(h.stateUpdateChan)
close(h.cancelStateUpdateChan)
// Close db connections
err = h.db.Close()
if err != nil {
@ -859,73 +854,6 @@ func (h *Headscale) getTLSSettings() (*tls.Config, error) {
}
}
// TODO(kradalby): baby steps, make this more robust.
func (h *Headscale) watchStateChannel() {
for {
select {
case <-h.stateUpdateChan:
h.setLastStateChangeToNow()
case <-h.cancelStateUpdateChan:
return
}
}
}
func (h *Headscale) setLastStateChangeToNow() {
var err error
now := time.Now().UTC()
users, err := h.db.ListUsers()
if err != nil {
log.Error().
Caller().
Err(err).
Msg("failed to fetch all users, failing to update last changed state.")
}
for _, user := range users {
lastStateUpdate.WithLabelValues(user.Name, "headscale").Set(float64(now.Unix()))
if h.lastStateChange == nil {
h.lastStateChange = xsync.NewMapOf[time.Time]()
}
h.lastStateChange.Store(user.Name, now)
}
}
func (h *Headscale) getLastStateChange(users ...types.User) time.Time {
times := []time.Time{}
// getLastStateChange takes a list of users as a "filter", if no users
// are past, then use the entier list of users and look for the last update
if len(users) > 0 {
for _, user := range users {
if lastChange, ok := h.lastStateChange.Load(user.Name); ok {
times = append(times, lastChange)
}
}
} else {
h.lastStateChange.Range(func(key string, value time.Time) bool {
times = append(times, value)
return true
})
}
sort.Slice(times, func(i, j int) bool {
return times[i].After(times[j])
})
log.Trace().Msgf("Latest times %#v", times)
if len(times) == 0 {
return time.Now().UTC()
} else {
return times[0]
}
}
func notFoundHandler(
writer http.ResponseWriter,
req *http.Request,

6
hscontrol/db/addresses_test.go
View file

@ -63,8 +63,6 @@ func (s *Suite) TestGetUsedIps(c *check.C) {
c.Assert(len(machine1.IPAddresses), check.Equals, 1)
c.Assert(machine1.IPAddresses[0], check.Equals, expected)
c.Assert(channelUpdates, check.Equals, int32(0))
}
func (s *Suite) TestGetMultiIp(c *check.C) {
@ -153,8 +151,6 @@ func (s *Suite) TestGetMultiIp(c *check.C) {
c.Assert(len(nextIP2), check.Equals, 1)
c.Assert(nextIP2[0].String(), check.Equals, expectedNextIP.String())
c.Assert(channelUpdates, check.Equals, int32(0))
}
func (s *Suite) TestGetAvailableIpMachineWithoutIP(c *check.C) {
@ -192,6 +188,4 @@ func (s *Suite) TestGetAvailableIpMachineWithoutIP(c *check.C) {
c.Assert(len(ips2), check.Equals, 1)
c.Assert(ips2[0].String(), check.Equals, expected.String())
c.Assert(channelUpdates, check.Equals, int32(0))
}

8
hscontrol/db/api_key_test.go
View file

@ -22,8 +22,6 @@ func (*Suite) TestCreateAPIKey(c *check.C) {
keys, err := db.ListAPIKeys()
c.Assert(err, check.IsNil)
c.Assert(len(keys), check.Equals, 1)
c.Assert(channelUpdates, check.Equals, int32(0))
}
func (*Suite) TestAPIKeyDoesNotExist(c *check.C) {
@ -41,8 +39,6 @@ func (*Suite) TestValidateAPIKeyOk(c *check.C) {
valid, err := db.ValidateAPIKey(apiKeyStr)
c.Assert(err, check.IsNil)
c.Assert(valid, check.Equals, true)
c.Assert(channelUpdates, check.Equals, int32(0))
}
func (*Suite) TestValidateAPIKeyNotOk(c *check.C) {
@ -71,8 +67,6 @@ func (*Suite) TestValidateAPIKeyNotOk(c *check.C) {
validWithErr, err := db.ValidateAPIKey("produceerrorkey")
c.Assert(err, check.NotNil)
c.Assert(validWithErr, check.Equals, false)
c.Assert(channelUpdates, check.Equals, int32(0))
}
func (*Suite) TestExpireAPIKey(c *check.C) {
@ -92,6 +86,4 @@ func (*Suite) TestExpireAPIKey(c *check.C) {
notValid, err := db.ValidateAPIKey(apiKeyStr)
c.Assert(err, check.IsNil)
c.Assert(notValid, check.Equals, false)
c.Assert(channelUpdates, check.Equals, int32(0))
}

15
hscontrol/db/db.go
View file

@ -9,6 +9,7 @@ import (
"time"
"github.com/glebarez/sqlite"
"github.com/juanfont/headscale/hscontrol/notifier"
"github.com/juanfont/headscale/hscontrol/types"
"github.com/juanfont/headscale/hscontrol/util"
"github.com/rs/zerolog/log"
@ -36,8 +37,8 @@ type KV struct {
}
type HSDatabase struct {
db *gorm.DB
notifyStateChan chan<- struct{}
db *gorm.DB
notifier *notifier.Notifier
ipAllocationMutex sync.Mutex
@ -50,7 +51,7 @@ type HSDatabase struct {
func NewHeadscaleDatabase(
dbType, connectionAddr string,
debug bool,
notifyStateChan chan<- struct{},
notifier *notifier.Notifier,
ipPrefixes []netip.Prefix,
baseDomain string,
) (*HSDatabase, error) {
@ -60,8 +61,8 @@ func NewHeadscaleDatabase(
}
db := HSDatabase{
db: dbConn,
notifyStateChan: notifyStateChan,
db: dbConn,
notifier: notifier,
ipPrefixes: ipPrefixes,
baseDomain: baseDomain,
@ -297,10 +298,6 @@ func openDB(dbType, connectionAddr string, debug bool) (*gorm.DB, error) {
)
}
func (hsdb *HSDatabase) notifyStateChange() {
hsdb.notifyStateChan <- struct{}{}
}
// getValue returns the value for the given key in KV.
func (hsdb *HSDatabase) getValue(key string) (string, error) {
var row KV

55
hscontrol/db/machine.go
View file

@ -218,7 +218,7 @@ func (hsdb *HSDatabase) SetTags(
}
machine.ForcedTags = newTags
hsdb.notifyStateChange()
hsdb.notifier.NotifyWithIgnore(machine.MachineKey)
if err := hsdb.db.Save(machine).Error; err != nil {
return fmt.Errorf("failed to update tags for machine in the database: %w", err)
@ -232,7 +232,7 @@ func (hsdb *HSDatabase) ExpireMachine(machine *types.Machine) error {
now := time.Now()
machine.Expiry = &now
hsdb.notifyStateChange()
hsdb.notifier.NotifyWithIgnore(machine.MachineKey)
if err := hsdb.db.Save(machine).Error; err != nil {
return fmt.Errorf("failed to expire machine in the database: %w", err)
@ -259,7 +259,7 @@ func (hsdb *HSDatabase) RenameMachine(machine *types.Machine, newName string) er
}
machine.GivenName = newName
hsdb.notifyStateChange()
hsdb.notifier.NotifyWithIgnore(machine.MachineKey)
if err := hsdb.db.Save(machine).Error; err != nil {
return fmt.Errorf("failed to rename machine in the database: %w", err)
@ -275,7 +275,7 @@ func (hsdb *HSDatabase) RefreshMachine(machine *types.Machine, expiry time.Time)
machine.LastSuccessfulUpdate = &now
machine.Expiry = &expiry
hsdb.notifyStateChange()
hsdb.notifier.NotifyWithIgnore(machine.MachineKey)
if err := hsdb.db.Save(machine).Error; err != nil {
return fmt.Errorf(
@ -323,32 +323,6 @@ func (hsdb *HSDatabase) HardDeleteMachine(machine *types.Machine) error {
return nil
}
func (hsdb *HSDatabase) IsOutdated(machine *types.Machine, lastChange time.Time) bool {
if err := hsdb.UpdateMachineFromDatabase(machine); err != nil {
// It does not seem meaningful to propagate this error as the end result
// will have to be that the machine has to be considered outdated.
return true
}
// Get the last update from all headscale users to compare with our nodes
// last update.
// TODO(kradalby): Only request updates from users where we can talk to nodes
// This would mostly be for a bit of performance, and can be calculated based on
// ACLs.
lastUpdate := machine.CreatedAt
if machine.LastSuccessfulUpdate != nil {
lastUpdate = *machine.LastSuccessfulUpdate
}
log.Trace().
Caller().
Str("machine", machine.Hostname).
Time("last_successful_update", lastChange).
Time("last_state_change", lastUpdate).
Msgf("Checking if %s is missing updates", machine.Hostname)
return lastUpdate.Before(lastChange)
}
func (hsdb *HSDatabase) RegisterMachineFromAuthCallback(
cache *cache.Cache,
nodeKeyStr string,
@ -626,7 +600,7 @@ func (hsdb *HSDatabase) enableRoutes(machine *types.Machine, routeStrs ...string
}
}
hsdb.notifyStateChange()
hsdb.notifier.NotifyWithIgnore(machine.MachineKey)
return nil
}
@ -723,17 +697,22 @@ func (hsdb *HSDatabase) ExpireEphemeralMachines(inactivityThreshhold time.Durati
}
if expiredFound {
hsdb.notifyStateChange()
hsdb.notifier.NotifyAll()
}
}
}
func (hsdb *HSDatabase) ExpireExpiredMachines(lastChange time.Time) {
func (hsdb *HSDatabase) ExpireExpiredMachines(lastCheck time.Time) time.Time {
// use the time of the start of the function to ensure we
// dont miss some machines by returning it _after_ we have
// checked everything.
started := time.Now()
users, err := hsdb.ListUsers()
if err != nil {
log.Error().Err(err).Msg("Error listing users")
return
return time.Unix(0, 0)
}
for _, user := range users {
@ -744,13 +723,13 @@ func (hsdb *HSDatabase) ExpireExpiredMachines(lastChange time.Time) {
Str("user", user.Name).
Msg("Error listing machines in user")
return
return time.Unix(0, 0)
}
expiredFound := false
for index, machine := range machines {
if machine.IsExpired() &&
machine.Expiry.After(lastChange) {
machine.Expiry.After(lastCheck) {
expiredFound = true
err := hsdb.ExpireMachine(&machines[index])
@ -770,7 +749,9 @@ func (hsdb *HSDatabase) ExpireExpiredMachines(lastChange time.Time) {
}
if expiredFound {
hsdb.notifyStateChange()
hsdb.notifier.NotifyAll()
}
}
return started
}

26
hscontrol/db/machine_test.go
View file

@ -39,8 +39,6 @@ func (s *Suite) TestGetMachine(c *check.C) {
_, err = db.GetMachine("test", "testmachine")
c.Assert(err, check.IsNil)
c.Assert(channelUpdates, check.Equals, int32(0))
}
func (s *Suite) TestGetMachineByID(c *check.C) {
@ -67,8 +65,6 @@ func (s *Suite) TestGetMachineByID(c *check.C) {
_, err = db.GetMachineByID(0)
c.Assert(err, check.IsNil)
c.Assert(channelUpdates, check.Equals, int32(0))
}
func (s *Suite) TestGetMachineByNodeKey(c *check.C) {
@ -98,8 +94,6 @@ func (s *Suite) TestGetMachineByNodeKey(c *check.C) {
_, err = db.GetMachineByNodeKey(nodeKey.Public())
c.Assert(err, check.IsNil)
c.Assert(channelUpdates, check.Equals, int32(0))
}
func (s *Suite) TestGetMachineByAnyNodeKey(c *check.C) {
@ -131,8 +125,6 @@ func (s *Suite) TestGetMachineByAnyNodeKey(c *check.C) {
_, err = db.GetMachineByAnyKey(machineKey.Public(), nodeKey.Public(), oldNodeKey.Public())
c.Assert(err, check.IsNil)
c.Assert(channelUpdates, check.Equals, int32(0))
}
func (s *Suite) TestDeleteMachine(c *check.C) {
@ -155,8 +147,6 @@ func (s *Suite) TestDeleteMachine(c *check.C) {
_, err = db.GetMachine(user.Name, "testmachine")
c.Assert(err, check.NotNil)
c.Assert(channelUpdates, check.Equals, int32(0))
}
func (s *Suite) TestHardDeleteMachine(c *check.C) {
@ -179,8 +169,6 @@ func (s *Suite) TestHardDeleteMachine(c *check.C) {
_, err = db.GetMachine(user.Name, "testmachine3")
c.Assert(err, check.NotNil)
c.Assert(channelUpdates, check.Equals, int32(0))
}
func (s *Suite) TestListPeers(c *check.C) {
@ -217,8 +205,6 @@ func (s *Suite) TestListPeers(c *check.C) {
c.Assert(peersOfMachine0[0].Hostname, check.Equals, "testmachine2")
c.Assert(peersOfMachine0[5].Hostname, check.Equals, "testmachine7")
c.Assert(peersOfMachine0[8].Hostname, check.Equals, "testmachine10")
c.Assert(channelUpdates, check.Equals, int32(0))
}
func (s *Suite) TestGetACLFilteredPeers(c *check.C) {
@ -312,8 +298,6 @@ func (s *Suite) TestGetACLFilteredPeers(c *check.C) {
c.Assert(peersOfAdminMachine[0].Hostname, check.Equals, "testmachine2")
c.Assert(peersOfAdminMachine[2].Hostname, check.Equals, "testmachine4")
c.Assert(peersOfAdminMachine[5].Hostname, check.Equals, "testmachine7")
c.Assert(channelUpdates, check.Equals, int32(0))
}
func (s *Suite) TestExpireMachine(c *check.C) {
@ -349,8 +333,6 @@ func (s *Suite) TestExpireMachine(c *check.C) {
c.Assert(err, check.IsNil)
c.Assert(machineFromDB.IsExpired(), check.Equals, true)
c.Assert(channelUpdates, check.Equals, int32(1))
}
func (s *Suite) TestSerdeAddressStrignSlice(c *check.C) {
@ -372,8 +354,6 @@ func (s *Suite) TestSerdeAddressStrignSlice(c *check.C) {
for i := range deserialized {
c.Assert(deserialized[i], check.Equals, input[i])
}
c.Assert(channelUpdates, check.Equals, int32(0))
}
func (s *Suite) TestGenerateGivenName(c *check.C) {
@ -418,8 +398,6 @@ func (s *Suite) TestGenerateGivenName(c *check.C) {
comment = check.Commentf("Unique users, unique machines, same hostname, conflict")
c.Assert(err, check.IsNil, comment)
c.Assert(givenName, check.Matches, fmt.Sprintf("^hostname-1-[a-z0-9]{%d}$", MachineGivenNameHashLength), comment)
c.Assert(channelUpdates, check.Equals, int32(0))
}
func (s *Suite) TestSetTags(c *check.C) {
@ -463,8 +441,6 @@ func (s *Suite) TestSetTags(c *check.C) {
check.DeepEquals,
types.StringList([]string{"tag:bar", "tag:test", "tag:unknown"}),
)
c.Assert(channelUpdates, check.Equals, int32(2))
}
func TestHeadscale_generateGivenName(t *testing.T) {
@ -655,6 +631,4 @@ func (s *Suite) TestAutoApproveRoutes(c *check.C) {
enabledRoutes, err := db.GetEnabledRoutes(machine0ByID)
c.Assert(err, check.IsNil)
c.Assert(enabledRoutes, check.HasLen, 4)
c.Assert(channelUpdates, check.Equals, int32(4))
}

2
hscontrol/db/preauth_keys_test.go
View file

@ -161,8 +161,6 @@ func (*Suite) TestEphemeralKey(c *check.C) {
// The machine record should have been deleted
_, err = db.GetMachine("test7", "testest")
c.Assert(err, check.NotNil)
c.Assert(channelUpdates, check.Equals, int32(1))
}
func (*Suite) TestExpirePreauthKey(c *check.C) {

2
hscontrol/db/routes.go
View file

@ -374,7 +374,7 @@ func (hsdb *HSDatabase) HandlePrimarySubnetFailover() error {
}
if routesChanged {
hsdb.notifyStateChange()
hsdb.notifier.NotifyAll()
}
return nil

10
hscontrol/db/routes_test.go
View file

@ -52,8 +52,6 @@ func (s *Suite) TestGetRoutes(c *check.C) {
err = db.enableRoutes(&machine, "10.0.0.0/24")
c.Assert(err, check.IsNil)
c.Assert(channelUpdates, check.Equals, int32(0))
}
func (s *Suite) TestGetEnableRoutes(c *check.C) {
@ -129,8 +127,6 @@ func (s *Suite) TestGetEnableRoutes(c *check.C) {
enabledRoutesWithAdditionalRoute, err := db.GetEnabledRoutes(&machine)
c.Assert(err, check.IsNil)
c.Assert(len(enabledRoutesWithAdditionalRoute), check.Equals, 2)
c.Assert(channelUpdates, check.Equals, int32(3))
}
func (s *Suite) TestIsUniquePrefix(c *check.C) {
@ -215,8 +211,6 @@ func (s *Suite) TestIsUniquePrefix(c *check.C) {
routes, err = db.GetMachinePrimaryRoutes(&machine2)
c.Assert(err, check.IsNil)
c.Assert(len(routes), check.Equals, 0)
c.Assert(channelUpdates, check.Equals, int32(3))
}
func (s *Suite) TestSubnetFailover(c *check.C) {
@ -359,8 +353,6 @@ func (s *Suite) TestSubnetFailover(c *check.C) {
routes, err = db.GetMachinePrimaryRoutes(&machine2)
c.Assert(err, check.IsNil)
c.Assert(len(routes), check.Equals, 2)
c.Assert(channelUpdates, check.Equals, int32(6))
}
func (s *Suite) TestDeleteRoutes(c *check.C) {
@ -420,6 +412,4 @@ func (s *Suite) TestDeleteRoutes(c *check.C) {
enabledRoutes1, err := db.GetEnabledRoutes(&machine1)
c.Assert(err, check.IsNil)
c.Assert(len(enabledRoutes1), check.Equals, 1)
c.Assert(channelUpdates, check.Equals, int32(2))
}

20
hscontrol/db/suite_test.go
View file

@ -3,9 +3,9 @@ package db
import (
"net/netip"
"os"
"sync/atomic"
"testing"
"github.com/juanfont/headscale/hscontrol/notifier"
"gopkg.in/check.v1"
)
@ -20,14 +20,9 @@ type Suite struct{}
var (
tmpDir string
db *HSDatabase
// channelUpdates counts the number of times
// either of the channels was notified.
channelUpdates int32
)
func (s *Suite) SetUpTest(c *check.C) {
atomic.StoreInt32(&channelUpdates, 0)
s.ResetDB(c)
}
@ -35,13 +30,6 @@ func (s *Suite) TearDownTest(c *check.C) {
os.RemoveAll(tmpDir)
}
func notificationSink(c <-chan struct{}) {
for {
<-c
atomic.AddInt32(&channelUpdates, 1)
}
}
func (s *Suite) ResetDB(c *check.C) {
if len(tmpDir) != 0 {
os.RemoveAll(tmpDir)
@ -52,15 +40,11 @@ func (s *Suite) ResetDB(c *check.C) {
c.Fatal(err)
}
sink := make(chan struct{})
go notificationSink(sink)
db, err = NewHeadscaleDatabase(
"sqlite3",
tmpDir+"/headscale_test.db",
false,
sink,
notifier.NewNotifier(),
[]netip.Prefix{
netip.MustParsePrefix("10.27.0.0/23"),
},

11
hscontrol/metrics.go
View file

@ -10,12 +10,6 @@ const prometheusNamespace = "headscale"
var (
// This is a high cardinality metric (user x machines), we might want to make this
// configurable/opt-in in the future.
lastStateUpdate = promauto.NewGaugeVec(prometheus.GaugeOpts{
Namespace: prometheusNamespace,
Name: "last_update_seconds",
Help: "Time stamp in unix time when a machine or headscale was updated",
}, []string{"user", "machine"})
machineRegistrations = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: prometheusNamespace,
Name: "machine_registrations_total",
@ -33,9 +27,4 @@ var (
Help: "The number of calls/messages issued on a specific nodes update channel",
}, []string{"user", "machine", "status"})
// TODO(kradalby): This is very debugging, we might want to remove it.
updateRequestsReceivedOnChannel = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: prometheusNamespace,
Name: "update_request_received_on_channel_total",
Help: "The number of update requests received on an update channel",
}, []string{"user", "machine"})
)

55
hscontrol/notifier/notifier.go Normal file
View file

@ -0,0 +1,55 @@
package notifier
import (
"sync"
"github.com/juanfont/headscale/hscontrol/util"
)
type Notifier struct {
l sync.RWMutex
nodes map[string]chan<- struct{}
}
func NewNotifier() *Notifier {
return &Notifier{}
}
func (n *Notifier) AddNode(machineKey string, c chan<- struct{}) {
n.l.Lock()
defer n.l.Unlock()
if n.nodes == nil {
n.nodes = make(map[string]chan<- struct{})
}
n.nodes[machineKey] = c
}
func (n *Notifier) RemoveNode(machineKey string) {
n.l.Lock()
defer n.l.Unlock()
if n.nodes == nil {
return
}
delete(n.nodes, machineKey)
}
func (n *Notifier) NotifyAll() {
n.NotifyWithIgnore()
}
func (n *Notifier) NotifyWithIgnore(ignore ...string) {
n.l.RLock()
defer n.l.RUnlock()
for key, c := range n.nodes {
if util.IsStringInSlice(ignore, key) {
continue
}
c <- struct{}{}
}
}

629
hscontrol/poll.go
View file

@ -21,6 +21,38 @@ type contextKey string
const machineNameContextKey = contextKey("machineName")
type UpdateNode func()
func logPollFunc(
mapRequest tailcfg.MapRequest,
machine *types.Machine,
isNoise bool,
) (func(string), func(error, string)) {
return func(msg string) {
log.Info().
Caller().
Bool("noise", isNoise).
Bool("readOnly", mapRequest.ReadOnly).
Bool("omitPeers", mapRequest.OmitPeers).
Bool("stream", mapRequest.Stream).
Str("node_key", machine.NodeKey).
Str("machine", machine.Hostname).
Msg(msg)
},
func(err error, msg string) {
log.Error().
Caller().
Bool("noise", isNoise).
Bool("readOnly", mapRequest.ReadOnly).
Bool("omitPeers", mapRequest.OmitPeers).
Bool("stream", mapRequest.Stream).
Str("node_key", machine.NodeKey).
Str("machine", machine.Hostname).
Err(err).
Msg(msg)
}
}
// handlePoll is the common code for the legacy and Noise protocols to
// managed the poll loop.
func (h *Headscale) handlePoll(
@ -30,6 +62,10 @@ func (h *Headscale) handlePoll(
mapRequest tailcfg.MapRequest,
isNoise bool,
) {
logInfo, logErr := logPollFunc(mapRequest, machine, isNoise)
// TODO(kradalby): This is a stepping stone, mapper should be initiated once
// per client or something similar
mapp := mapper.NewMapper(
h.db,
h.privateKey2019,
@ -48,11 +84,7 @@ func (h *Headscale) handlePoll(
err := h.db.ProcessMachineRoutes(machine)
if err != nil {
log.Error().
Caller().
Err(err).
Str("machine", machine.Hostname).
Msg("Error processing machine routes")
logErr(err, "Error processing machine routes")
}
// update ACLRules with peer informations (to update server tags if necessary)
@ -60,12 +92,7 @@ func (h *Headscale) handlePoll(
// update routes with peer information
err = h.db.EnableAutoApprovedRoutes(h.ACLPolicy, machine)
if err != nil {
log.Error().
Caller().
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Err(err).
Msg("Error running auto approved routes")
logErr(err, "Error running auto approved routes")
}
}
@ -83,13 +110,7 @@ func (h *Headscale) handlePoll(
}
if err := h.db.MachineSave(machine); err != nil {
log.Error().
Str("handler", "PollNetMap").
Bool("noise", isNoise).
Str("node_key", machine.NodeKey).
Str("machine", machine.Hostname).
Err(err).
Msg("Failed to persist/update machine in the database")
logErr(err, "Failed to persist/update machine in the database")
http.Error(writer, "", http.StatusInternalServerError)
return
@ -97,13 +118,7 @@ func (h *Headscale) handlePoll(
mapResp, err := mapp.CreateMapResponse(mapRequest, machine, h.ACLPolicy)
if err != nil {
log.Error().
Str("handler", "PollNetMap").
Bool("noise", isNoise).
Str("node_key", machine.NodeKey).
Str("machine", machine.Hostname).
Err(err).
Msg("Failed to get Map response")
logErr(err, "Failed to create MapResponse")
http.Error(writer, "", http.StatusInternalServerError)
return
@ -114,30 +129,16 @@ func (h *Headscale) handlePoll(
// empty endpoints to peers)
// Details on the protocol can be found in https://github.com/tailscale/tailscale/blob/main/tailcfg/tailcfg.go#L696
log.Debug().
Str("handler", "PollNetMap").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Bool("readOnly", mapRequest.ReadOnly).
Bool("omitPeers", mapRequest.OmitPeers).
Bool("stream", mapRequest.Stream).
Msg("Client map request processed")
logInfo("Client map request processed")
if mapRequest.ReadOnly {
log.Info().
Str("handler", "PollNetMap").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Msg("Client is starting up. Probably interested in a DERP map")
logInfo("Client is starting up. Probably interested in a DERP map")
writer.Header().Set("Content-Type", "application/json; charset=utf-8")
writer.WriteHeader(http.StatusOK)
_, err := writer.Write(mapResp)
if err != nil {
log.Error().
Caller().
Err(err).
Msg("Failed to write response")
logErr(err, "Failed to write response")
}
if f, ok := writer.(http.Flusher); ok {
@ -147,48 +148,22 @@ func (h *Headscale) handlePoll(
return
}
// There has been an update to _any_ of the nodes that the other nodes would
// need to know about
h.setLastStateChangeToNow()
// The request is not ReadOnly, so we need to set up channels for updating
// peers via longpoll
// Only create update channel if it has not been created
log.Trace().
Caller().
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Msg("Loading or creating update channel")
const chanSize = 8
updateChan := make(chan struct{}, chanSize)
pollDataChan := make(chan []byte, chanSize)
defer closeChanWithLog(pollDataChan, machine.Hostname, "pollDataChan")
keepAliveChan := make(chan []byte)
if mapRequest.OmitPeers && !mapRequest.Stream {
log.Info().
Str("handler", "PollNetMap").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Msg("Client sent endpoint update and is ok with a response without peer list")
logInfo("Client sent endpoint update and is ok with a response without peer list")
writer.Header().Set("Content-Type", "application/json; charset=utf-8")
writer.WriteHeader(http.StatusOK)
_, err := writer.Write(mapResp)
if err != nil {
log.Error().
Caller().
Err(err).
Msg("Failed to write response")
logErr(err, "Failed to write response")
}
// It sounds like we should update the nodes when we have received a endpoint update
// even tho the comments in the tailscale code dont explicitly say so.
updateRequestsFromNode.WithLabelValues(machine.User.Name, machine.Hostname, "endpoint-update").
Inc()
updateChan <- struct{}{}
// Tell all the other nodes about the new endpoint, but dont update ourselves.
h.nodeNotifier.NotifyWithIgnore(machine.MachineKey)
return
} else if mapRequest.OmitPeers && mapRequest.Stream {
@ -202,43 +177,32 @@ func (h *Headscale) handlePoll(
return
}
log.Info().
Str("handler", "PollNetMap").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Msg("Client is ready to access the tailnet")
log.Info().
Str("handler", "PollNetMap").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Msg("Sending initial map")
pollDataChan <- mapResp
logInfo("Sending initial map")
log.Info().
Str("handler", "PollNetMap").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Msg("Notifying peers")
updateRequestsFromNode.WithLabelValues(machine.User.Name, machine.Hostname, "full-update").
Inc()
updateChan <- struct{}{}
// Send the client an update to make sure we send an initial mapresponse
_, err = writer.Write(mapResp)
if err != nil {
logErr(err, "Could not write the map response")
return
}
if flusher, ok := writer.(http.Flusher); ok {
flusher.Flush()
} else {
return
}
h.pollNetMapStream(
writer,
ctx,
machine,
mapp,
mapRequest,
pollDataChan,
keepAliveChan,
updateChan,
isNoise,
)
log.Trace().
Str("handler", "PollNetMap").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Msg("Finished stream, closing PollNetMap session")
logInfo("Finished stream, closing PollNetMap session")
}
// pollNetMapStream stream logic for /machine/map,
@ -247,23 +211,16 @@ func (h *Headscale) pollNetMapStream(
writer http.ResponseWriter,
ctxReq context.Context,
machine *types.Machine,
mapp *mapper.Mapper,
mapRequest tailcfg.MapRequest,
pollDataChan chan []byte,
keepAliveChan chan []byte,
updateChan chan struct{},
isNoise bool,
) {
// TODO(kradalby): This is a stepping stone, mapper should be initiated once
// per client or something similar
mapp := mapper.NewMapper(h.db,
h.privateKey2019,
isNoise,
h.DERPMap,
h.cfg.BaseDomain,
h.cfg.DNSConfig,
h.cfg.LogTail.Enabled,
h.cfg.RandomizeClientPort,
)
logInfo, logErr := logPollFunc(mapRequest, machine, isNoise)
keepAliveTicker := time.NewTicker(keepAliveInterval)
const chanSize = 8
updateChan := make(chan struct{}, chanSize)
h.pollNetMapStreamWG.Add(1)
defer h.pollNetMapStreamWG.Done()
@ -273,447 +230,93 @@ func (h *Headscale) pollNetMapStream(
ctx, cancel := context.WithCancel(ctx)
defer cancel()
go h.scheduledPollWorker(
ctx,
updateChan,
keepAliveChan,
mapRequest,
machine,
isNoise,
)
log.Trace().
Str("handler", "pollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Msg("Waiting for data to stream...")
log.Trace().
Str("handler", "pollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Msgf("pollData is %#v, keepAliveChan is %#v, updateChan is %#v", pollDataChan, keepAliveChan, updateChan)
// Register the node's update channel
h.nodeNotifier.AddNode(machine.MachineKey, updateChan)
defer h.nodeNotifier.RemoveNode(machine.MachineKey)
defer closeChanWithLog(updateChan, machine.Hostname, "updateChan")
for {
select {
case data := <-pollDataChan:
log.Trace().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "pollData").
Int("bytes", len(data)).
Msg("Sending data received via pollData channel")
_, err := writer.Write(data)
case <-keepAliveTicker.C:
data, err := mapp.CreateKeepAliveResponse(mapRequest, machine)
if err != nil {
log.Error().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "pollData").
Err(err).
Msg("Cannot write data")
logErr(err, "Error generating the keep alive msg")
return
}
_, err = writer.Write(data)
if err != nil {
logErr(err, "Cannot write keep alive message")
flusher, ok := writer.(http.Flusher)
if !ok {
log.Error().
Caller().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "pollData").
Msg("Cannot cast writer to http.Flusher")
} else {
return
}
if flusher, ok := writer.(http.Flusher); ok {
flusher.Flush()
}
log.Trace().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "pollData").
Int("bytes", len(data)).
Msg("Data from pollData channel written successfully")
// TODO(kradalby): Abstract away all the database calls, this can cause race conditions
// when an outdated machine object is kept alive, e.g. db is update from
// command line, but then overwritten.
err = h.db.UpdateMachineFromDatabase(machine)
if err != nil {
log.Error().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "pollData").
Err(err).
Msg("Cannot update machine from database")
// client has been removed from database
// since the stream opened, terminate connection.
} else {
return
}
now := time.Now().UTC()
machine.LastSeen = &now
lastStateUpdate.WithLabelValues(machine.User.Name, machine.Hostname).
Set(float64(now.Unix()))
machine.LastSuccessfulUpdate = &now
err = h.db.TouchMachine(machine)
if err != nil {
log.Error().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "pollData").
Err(err).
Msg("Cannot update machine LastSuccessfulUpdate")
logErr(err, "Cannot update machine LastSeen")
return
}
log.Trace().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "pollData").
Int("bytes", len(data)).
Msg("Machine entry in database updated successfully after sending data")
case data := <-keepAliveChan:
log.Trace().
Str("handler", "PollNetMapStream").
Str("machine", machine.Hostname).
Str("channel", "keepAlive").
Int("bytes", len(data)).
Msg("Sending keep alive message")
_, err := writer.Write(data)
if err != nil {
log.Error().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "keepAlive").
Err(err).
Msg("Cannot write keep alive message")
return
}
flusher, ok := writer.(http.Flusher)
if !ok {
log.Error().
Caller().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "keepAlive").
Msg("Cannot cast writer to http.Flusher")
} else {
flusher.Flush()
}
log.Trace().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "keepAlive").
Int("bytes", len(data)).
Msg("Keep alive sent successfully")
// TODO(kradalby): Abstract away all the database calls, this can cause race conditions
// when an outdated machine object is kept alive, e.g. db is update from
// command line, but then overwritten.
err = h.db.UpdateMachineFromDatabase(machine)
if err != nil {
log.Error().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "keepAlive").
Err(err).
Msg("Cannot update machine from database")
// client has been removed from database
// since the stream opened, terminate connection.
return
}
now := time.Now().UTC()
machine.LastSeen = &now
err = h.db.TouchMachine(machine)
if err != nil {
log.Error().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "keepAlive").
Err(err).
Msg("Cannot update machine LastSeen")
return
}
log.Trace().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "keepAlive").
Int("bytes", len(data)).
Msg("Machine updated successfully after sending keep alive")
case <-updateChan:
log.Trace().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "update").
Msg("Received a request for update")
updateRequestsReceivedOnChannel.WithLabelValues(machine.User.Name, machine.Hostname).
Inc()
data, err := mapp.CreateMapResponse(mapRequest, machine, h.ACLPolicy)
if err != nil {
logErr(err, "Could not get the map update")
if h.db.IsOutdated(machine, h.getLastStateChange()) {
var lastUpdate time.Time
if machine.LastSuccessfulUpdate != nil {
lastUpdate = *machine.LastSuccessfulUpdate
}
log.Debug().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Time("last_successful_update", lastUpdate).
Time("last_state_change", h.getLastStateChange(machine.User)).
Msgf("There has been updates since the last successful update to %s", machine.Hostname)
data, err := mapp.CreateMapResponse(mapRequest, machine, h.ACLPolicy)
if err != nil {
log.Error().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "update").
Err(err).
Msg("Could not get the map update")
return
}
return
}
_, err = writer.Write(data)
if err != nil {
log.Error().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "update").
Err(err).
Msg("Could not write the map response")
updateRequestsSentToNode.WithLabelValues(machine.User.Name, machine.Hostname, "failed").
Inc()
_, err = writer.Write(data)
if err != nil {
logErr(err, "Could not write the map response")
return
}
flusher, ok := writer.(http.Flusher)
if !ok {
log.Error().
Caller().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "update").
Msg("Cannot cast writer to http.Flusher")
} else {
flusher.Flush()
}
log.Trace().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "update").
Msg("Updated Map has been sent")
updateRequestsSentToNode.WithLabelValues(machine.User.Name, machine.Hostname, "success").
updateRequestsSentToNode.WithLabelValues(machine.User.Name, machine.Hostname, "failed").
Inc()
// Keep track of the last successful update,
// we sometimes end in a state were the update
// is not picked up by a client and we use this
// to determine if we should "force" an update.
// TODO(kradalby): Abstract away all the database calls, this can cause race conditions
// when an outdated machine object is kept alive, e.g. db is update from
// command line, but then overwritten.
err = h.db.UpdateMachineFromDatabase(machine)
if err != nil {
log.Error().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "update").
Err(err).
Msg("Cannot update machine from database")
return
}
// client has been removed from database
// since the stream opened, terminate connection.
return
}
now := time.Now().UTC()
lastStateUpdate.WithLabelValues(machine.User.Name, machine.Hostname).
Set(float64(now.Unix()))
machine.LastSuccessfulUpdate = &now
err = h.db.TouchMachine(machine)
if err != nil {
log.Error().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "update").
Err(err).
Msg("Cannot update machine LastSuccessfulUpdate")
return
}
if flusher, ok := writer.(http.Flusher); ok {
flusher.Flush()
} else {
var lastUpdate time.Time
if machine.LastSuccessfulUpdate != nil {
lastUpdate = *machine.LastSuccessfulUpdate
}
log.Trace().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Time("last_successful_update", lastUpdate).
Time("last_state_change", h.getLastStateChange(machine.User)).
Msgf("%s is up to date", machine.Hostname)
return
}
// Keep track of the last successful update,
// we sometimes end in a state were the update
// is not picked up by a client and we use this
// to determine if we should "force" an update.
err = h.db.TouchMachine(machine)
if err != nil {
logErr(err, "Cannot update machine LastSuccessfulUpdate")
return
}
case <-ctx.Done():
log.Info().
Str("handler", "PollNetMapStream").
Str("machine", machine.Hostname).
Msg("The client has closed the connection")
// TODO: Abstract away all the database calls, this can cause race conditions
// when an outdated machine object is kept alive, e.g. db is update from
// command line, but then overwritten.
err := h.db.UpdateMachineFromDatabase(machine)
if err != nil {
log.Error().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "Done").
Err(err).
Msg("Cannot update machine from database")
logInfo("The client has closed the connection")
// client has been removed from database
// since the stream opened, terminate connection.
return
}
now := time.Now().UTC()
machine.LastSeen = &now
err = h.db.TouchMachine(machine)
err := h.db.TouchMachine(machine)
if err != nil {
log.Error().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Str("channel", "Done").
Err(err).
Msg("Cannot update machine LastSeen")
logErr(err, "Cannot update machine LastSeen")
}
// The connection has been closed, so we can stop polling.
return
case <-h.shutdownChan:
log.Info().
Str("handler", "PollNetMapStream").
Bool("noise", isNoise).
Str("machine", machine.Hostname).
Msg("The long-poll handler is shutting down")
logInfo("The long-poll handler is shutting down")
return
}
}
}
func (h *Headscale) scheduledPollWorker(
ctx context.Context,
updateChan chan struct{},
keepAliveChan chan []byte,
mapRequest tailcfg.MapRequest,
machine *types.Machine,
isNoise bool,
) {
// TODO(kradalby): This is a stepping stone, mapper should be initiated once
// per client or something similar
mapp := mapper.NewMapper(h.db,
h.privateKey2019,
isNoise,
h.DERPMap,
h.cfg.BaseDomain,
h.cfg.DNSConfig,
h.cfg.LogTail.Enabled,
h.cfg.RandomizeClientPort,
)
keepAliveTicker := time.NewTicker(keepAliveInterval)
updateCheckerTicker := time.NewTicker(h.cfg.NodeUpdateCheckInterval)
defer closeChanWithLog(
updateChan,
fmt.Sprint(ctx.Value(machineNameContextKey)),
"updateChan",
)
defer closeChanWithLog(
keepAliveChan,
fmt.Sprint(ctx.Value(machineNameContextKey)),
"keepAliveChan",
)
for {
select {
case <-ctx.Done():
return
case <-keepAliveTicker.C:
data, err := mapp.CreateKeepAliveResponse(mapRequest, machine)
if err != nil {
log.Error().
Str("func", "keepAlive").
Bool("noise", isNoise).
Err(err).
Msg("Error generating the keep alive msg")
return
}
log.Debug().
Str("func", "keepAlive").
Str("machine", machine.Hostname).
Bool("noise", isNoise).
Msg("Sending keepalive")
select {
case keepAliveChan <- data:
case <-ctx.Done():
return
}
case <-updateCheckerTicker.C:
log.Debug().
Str("func", "scheduledPollWorker").
Str("machine", machine.Hostname).
Bool("noise", isNoise).
Msg("Sending update request")
updateRequestsFromNode.WithLabelValues(machine.User.Name, machine.Hostname, "scheduled-update").
Inc()
select {
case updateChan <- struct{}{}:
case <-ctx.Done():
return
}
}
}
}
func closeChanWithLog[C chan []byte | chan struct{}](channel C, machine, name string) {
log.Trace().
Str("handler", "PollNetMap").