Merge branch 'magic-dns-support' of https://github.com/juanfont/headscale into magic-dns-support

.github/workflows/build.yml

@@ -0,0 +1,36 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: "1.16.3"
+
+      - name: Install dependencies
+        run: |
+          go version
+          go install golang.org/x/lint/golint@latest
+          sudo apt update
+          sudo apt install -y make
+
+      - name: Run lint
+        run: make build
+
+      - uses: actions/upload-artifact@v2
+        with:
+          name: headscale-linux
+          path: headscale

api.go

@@ -282,7 +282,7 @@ func (h *Headscale) getMapResponse(mKey wgkey.Key, req tailcfg.MapRequest, m *Ma
 	log.Trace().
 		Str("func", "getMapResponse").
 		Str("machine", req.Hostinfo.Hostname).
-		Interface("payload", resp).
+		// Interface("payload", resp).
 		Msgf("Generated map response: %s", tailMapResponseToString(resp))
 
 	var respBody []byte

app.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"net/http"
 	"os"
+	"sort"
 	"strings"
 	"sync"
 	"time"
@@ -67,9 +68,6 @@ type Headscale struct {
 	aclPolicy *ACLPolicy
 	aclRules  *[]tailcfg.FilterRule
 
-	clientsUpdateChannels     sync.Map
-	clientsUpdateChannelMutex sync.Mutex
-
 	lastStateChange sync.Map
 }
 
@@ -158,10 +156,9 @@ func (h *Headscale) expireEphemeralNodesWorker() {
 				if err != nil {
 					log.Error().Err(err).Str("machine", m.Name).Msg("🤮 Cannot delete ephemeral machine from the database")
 				}
-				updateRequestsFromNode.WithLabelValues("ephemeral-node-update").Inc()
-				h.notifyChangesToPeers(&m)
 			}
 		}
+		h.setLastStateChangeToNow(ns.Name)
 	}
 }
 
@@ -264,14 +261,28 @@ func (h *Headscale) setLastStateChangeToNow(namespace string) {
 	h.lastStateChange.Store(namespace, now)
 }
 
-func (h *Headscale) getLastStateChange(namespace string) time.Time {
+func (h *Headscale) getLastStateChange(namespaces ...string) time.Time {
+	times := []time.Time{}
+
+	for _, namespace := range namespaces {
 		if wrapped, ok := h.lastStateChange.Load(namespace); ok {
 			lastChange, _ := wrapped.(time.Time)
-		return lastChange
+
+			times = append(times, lastChange)
+		}
 
 	}
 
-	now := time.Now().UTC()
-	h.lastStateChange.Store(namespace, now)
-	return now
+	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]
+	}
 }

go.mod

@@ -10,6 +10,7 @@ require (
 	github.com/docker/cli v20.10.8+incompatible // indirect
 	github.com/docker/docker v20.10.8+incompatible // indirect
 	github.com/efekarakus/termcolor v1.0.1
+	github.com/fatih/set v0.2.1 // indirect
 	github.com/gin-gonic/gin v1.7.4
 	github.com/gofrs/uuid v4.0.0+incompatible
 	github.com/google/go-github v17.0.0+incompatible // indirect

go.sum

@@ -204,6 +204,8 @@ github.com/fanliao/go-promise v0.0.0-20141029170127-1890db352a72/go.mod h1:Pjfxu
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 github.com/fatih/color v1.9.0/go.mod h1:eQcE1qtQxscV5RaZvpXrrb8Drkc3/DdQ+uUYCNjL+zU=
 github.com/fatih/color v1.10.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM=
+github.com/fatih/set v0.2.1 h1:nn2CaJyknWE/6txyUDGwysr3G5QC6xWB/PtVjPBbeaA=
+github.com/fatih/set v0.2.1/go.mod h1:+RKtMCH+favT2+3YecHGxcc0b4KyVWA1QWWJUs4E0CI=
 github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI435gkrCt3MPfRiAkVrwSbHsst4LCFVfpJc=
 github.com/franela/goblin v0.0.0-20200105215937-c9ffbefa60db/go.mod h1:7dvUGVsVBjqR7JHJk0brhHOZYGmfBYOrK0ZhYMEtBr4=
 github.com/franela/goreq v0.0.0-20171204163338-bcd34c9993f8/go.mod h1:ZhphrRTfi2rbfLwlschooIH4+wKKDR4Pdxhh+TRoA20=

machine.go

@@ -2,13 +2,13 @@ package headscale
 
 import (
 	"encoding/json"
-	"errors"
 	"fmt"
 	"sort"
 	"strconv"
 	"strings"
 	"time"
 
+	"github.com/fatih/set"
 	"github.com/rs/zerolog/log"
 
 	"gorm.io/datatypes"
@@ -66,7 +66,7 @@ func (h *Headscale) getDirectPeers(m *Machine) (Machines, error) {
 	if err := h.db.Preload("Namespace").Where("namespace_id = ? AND machine_key <> ? AND registered",
 		m.NamespaceID, m.MachineKey).Find(&machines).Error; err != nil {
 		log.Error().Err(err).Msg("Error accessing db")
-		return nil, err
+		return Machines{}, err
 	}
 
 	sort.Slice(machines, func(i, j int) bool { return machines[i].ID < machines[j].ID })
@@ -88,7 +88,7 @@ func (h *Headscale) getShared(m *Machine) (Machines, error) {
 	sharedMachines := []SharedMachine{}
 	if err := h.db.Preload("Namespace").Preload("Machine").Where("namespace_id = ?",
 		m.NamespaceID).Find(&sharedMachines).Error; err != nil {
-		return nil, err
+		return Machines{}, err
 	}
 
 	peers := make(Machines, 0)
@@ -112,7 +112,7 @@ func (h *Headscale) getPeers(m *Machine) (Machines, error) {
 			Str("func", "getPeers").
 			Err(err).
 			Msg("Cannot fetch peers")
-		return nil, err
+		return Machines{}, err
 	}
 
 	shared, err := h.getShared(m)
@@ -121,7 +121,7 @@ func (h *Headscale) getPeers(m *Machine) (Machines, error) {
 			Str("func", "getDirectPeers").
 			Err(err).
 			Msg("Cannot fetch peers")
-		return nil, err
+		return Machines{}, err
 	}
 
 	peers := append(direct, shared...)
@@ -214,118 +214,31 @@ func (m *Machine) GetHostInfo() (*tailcfg.Hostinfo, error) {
 	return &hostinfo, nil
 }
 
-func (h *Headscale) notifyChangesToPeers(m *Machine) {
-	peers, err := h.getPeers(m)
-	if err != nil {
-		log.Error().
-			Str("func", "notifyChangesToPeers").
-			Str("machine", m.Name).
-			Msgf("Error getting peers: %s", err)
-		return
-	}
-	for _, peer := range peers {
-		log.Info().
-			Str("func", "notifyChangesToPeers").
-			Str("machine", m.Name).
-			Str("peer", peer.Name).
-			Str("address", peer.IPAddress).
-			Msgf("Notifying peer %s (%s)", peer.Name, peer.IPAddress)
-		err := h.sendRequestOnUpdateChannel(&peer)
-		if err != nil {
-			log.Info().
-				Str("func", "notifyChangesToPeers").
-				Str("machine", m.Name).
-				Str("peer", peer.Name).
-				Msgf("Peer %s does not have an open update client, skipping.", peer.Name)
-			continue
-		}
-		log.Trace().
-			Str("func", "notifyChangesToPeers").
-			Str("machine", m.Name).
-			Str("peer", peer.Name).
-			Str("address", peer.IPAddress).
-			Msgf("Notified peer %s (%s)", peer.Name, peer.IPAddress)
-	}
-}
-
-func (h *Headscale) getOrOpenUpdateChannel(m *Machine) <-chan struct{} {
-	var updateChan chan struct{}
-	if storedChan, ok := h.clientsUpdateChannels.Load(m.ID); ok {
-		if unwrapped, ok := storedChan.(chan struct{}); ok {
-			updateChan = unwrapped
-		} else {
-			log.Error().
-				Str("handler", "openUpdateChannel").
-				Str("machine", m.Name).
-				Msg("Failed to convert update channel to struct{}")
-		}
-	} else {
-		log.Debug().
-			Str("handler", "openUpdateChannel").
-			Str("machine", m.Name).
-			Msg("Update channel not found, creating")
-
-		updateChan = make(chan struct{})
-		h.clientsUpdateChannels.Store(m.ID, updateChan)
-	}
-	return updateChan
-}
-
-func (h *Headscale) closeUpdateChannel(m *Machine) {
-	h.clientsUpdateChannelMutex.Lock()
-	defer h.clientsUpdateChannelMutex.Unlock()
-
-	if storedChan, ok := h.clientsUpdateChannels.Load(m.ID); ok {
-		if unwrapped, ok := storedChan.(chan struct{}); ok {
-			close(unwrapped)
-		}
-	}
-	h.clientsUpdateChannels.Delete(m.ID)
-}
-
-func (h *Headscale) sendRequestOnUpdateChannel(m *Machine) error {
-	h.clientsUpdateChannelMutex.Lock()
-	defer h.clientsUpdateChannelMutex.Unlock()
-
-	pUp, ok := h.clientsUpdateChannels.Load(uint64(m.ID))
-	if ok {
-		log.Info().
-			Str("func", "requestUpdate").
-			Str("machine", m.Name).
-			Msgf("Notifying peer %s", m.Name)
-
-		if update, ok := pUp.(chan struct{}); ok {
-			log.Trace().
-				Str("func", "requestUpdate").
-				Str("machine", m.Name).
-				Msgf("Update channel is %#v", update)
-
-			updateRequestsToNode.Inc()
-			update <- struct{}{}
-
-			log.Trace().
-				Str("func", "requestUpdate").
-				Str("machine", m.Name).
-				Msgf("Notified machine %s", m.Name)
-		}
-	} else {
-		err := errors.New("machine does not have an open update channel")
-		log.Info().
-			Str("func", "requestUpdate").
-			Str("machine", m.Name).
-			Msgf("Machine %s does not have an open update channel", m.Name)
-		return err
-	}
-	return nil
-}
-
 func (h *Headscale) isOutdated(m *Machine) bool {
 	err := h.UpdateMachine(m)
 	if 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
 	}
 
-	lastChange := h.getLastStateChange(m.Namespace.Name)
+	sharedMachines, _ := h.getShared(m)
+
+	namespaceSet := set.New(set.ThreadSafe)
+	namespaceSet.Add(m.Namespace.Name)
+
+	// Check if any of our shared namespaces has updates that we have
+	// not propagated.
+	for _, sharedMachine := range sharedMachines {
+		namespaceSet.Add(sharedMachine.Namespace.Name)
+	}
+
+	namespaces := make([]string, namespaceSet.Size())
+	for index, namespace := range namespaceSet.List() {
+		namespaces[index] = namespace.(string)
+	}
+
+	lastChange := h.getLastStateChange(namespaces...)
 	log.Trace().
 		Str("func", "keepAlive").
 		Str("machine", m.Name).

metrics.go

@@ -26,16 +26,16 @@ var (
 		Namespace: prometheusNamespace,
 		Name:      "update_request_from_node_total",
 		Help:      "The number of updates requested by a node/update function",
-	}, []string{"state"})
-	updateRequestsToNode = promauto.NewCounter(prometheus.CounterOpts{
+	}, []string{"namespace", "machine", "state"})
+	updateRequestsSentToNode = promauto.NewCounterVec(prometheus.CounterOpts{
 		Namespace: prometheusNamespace,
-		Name:      "update_request_to_node_total",
+		Name:      "update_request_sent_to_node_total",
 		Help:      "The number of calls/messages issued on a specific nodes update channel",
-	})
+	}, []string{"namespace", "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{"machine"})
+	}, []string{"namespace", "machine"})
 )

namespaces.go

@@ -176,24 +176,17 @@ func (h *Headscale) checkForNamespacesPendingUpdates() {
 		return
 	}
 
-	names := []string{}
-	err = json.Unmarshal([]byte(v), &names)
+	namespaces := []string{}
+	err = json.Unmarshal([]byte(v), &namespaces)
 	if err != nil {
 		return
 	}
-	for _, name := range names {
+	for _, namespace := range namespaces {
 		log.Trace().
 			Str("func", "RequestMapUpdates").
-			Str("machine", name).
-			Msg("Sending updates to nodes in namespace")
-		machines, err := h.ListMachinesInNamespace(name)
-		if err != nil {
-			continue
-		}
-		for _, m := range *machines {
-			updateRequestsFromNode.WithLabelValues("namespace-update").Inc()
-			h.notifyChangesToPeers(&m)
-		}
+			Str("machine", namespace).
+			Msg("Sending updates to nodes in namespacespace")
+		h.setLastStateChangeToNow(namespace)
 	}
 	newV, err := h.getValue("namespaces_pending_updates")
 	if err != nil {

poll.go

@@ -140,10 +140,9 @@ func (h *Headscale) PollNetMapHandler(c *gin.Context) {
 		Str("id", c.Param("id")).
 		Str("machine", m.Name).
 		Msg("Loading or creating update channel")
-	updateChan := h.getOrOpenUpdateChannel(m)
+	updateChan := make(chan struct{})
 
 	pollDataChan := make(chan []byte)
-	// defer close(pollData)
 
 	keepAliveChan := make(chan []byte)
 
@@ -159,8 +158,8 @@ func (h *Headscale) PollNetMapHandler(c *gin.Context) {
 
 		// 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("endpoint-update").Inc()
-		go h.notifyChangesToPeers(m)
+		updateRequestsFromNode.WithLabelValues(m.Name, m.Namespace.Name, "endpoint-update").Inc()
+		go func() { updateChan <- struct{}{} }()
 		return
 	} else if req.OmitPeers && req.Stream {
 		log.Warn().
@@ -185,8 +184,8 @@ func (h *Headscale) PollNetMapHandler(c *gin.Context) {
 		Str("handler", "PollNetMap").
 		Str("machine", m.Name).
 		Msg("Notifying peers")
-	updateRequestsFromNode.WithLabelValues("full-update").Inc()
-	go h.notifyChangesToPeers(m)
+	updateRequestsFromNode.WithLabelValues(m.Name, m.Namespace.Name, "full-update").Inc()
+	go func() { updateChan <- struct{}{} }()
 
 	h.PollNetMapStream(c, m, req, mKey, pollDataChan, keepAliveChan, updateChan, cancelKeepAlive)
 	log.Trace().
@@ -206,10 +205,10 @@ func (h *Headscale) PollNetMapStream(
 	mKey wgkey.Key,
 	pollDataChan chan []byte,
 	keepAliveChan chan []byte,
-	updateChan <-chan struct{},
+	updateChan chan struct{},
 	cancelKeepAlive chan struct{},
 ) {
-	go h.scheduledPollWorker(cancelKeepAlive, keepAliveChan, mKey, req, m)
+	go h.scheduledPollWorker(cancelKeepAlive, updateChan, keepAliveChan, mKey, req, m)
 
 	c.Stream(func(w io.Writer) bool {
 		log.Trace().
@@ -325,7 +324,7 @@ func (h *Headscale) PollNetMapStream(
 				Str("machine", m.Name).
 				Str("channel", "update").
 				Msg("Received a request for update")
-			updateRequestsReceivedOnChannel.WithLabelValues(m.Name).Inc()
+			updateRequestsReceivedOnChannel.WithLabelValues(m.Name, m.Namespace.Name).Inc()
 			if h.isOutdated(m) {
 				log.Debug().
 					Str("handler", "PollNetMapStream").
@@ -350,6 +349,7 @@ func (h *Headscale) PollNetMapStream(
 						Str("channel", "update").
 						Err(err).
 						Msg("Could not write the map response")
+					updateRequestsSentToNode.WithLabelValues(m.Name, m.Namespace.Name, "failed").Inc()
 					return false
 				}
 				log.Trace().
@@ -357,6 +357,7 @@ func (h *Headscale) PollNetMapStream(
 					Str("machine", m.Name).
 					Str("channel", "update").
 					Msg("Updated Map has been sent")
+				updateRequestsSentToNode.WithLabelValues(m.Name, m.Namespace.Name, "success").Inc()
 
 				// Keep track of the last successful update,
 				// we sometimes end in a state were the update
@@ -423,7 +424,8 @@ func (h *Headscale) PollNetMapStream(
 				Str("machine", m.Name).
 				Str("channel", "Done").
 				Msg("Closing update channel")
-			h.closeUpdateChannel(m)
+			//h.closeUpdateChannel(m)
+			close(updateChan)
 
 			log.Trace().
 				Str("handler", "PollNetMapStream").
@@ -446,13 +448,14 @@ func (h *Headscale) PollNetMapStream(
 
 func (h *Headscale) scheduledPollWorker(
 	cancelChan <-chan struct{},
+	updateChan chan<- struct{},
 	keepAliveChan chan<- []byte,
 	mKey wgkey.Key,
 	req tailcfg.MapRequest,
 	m *Machine,
 ) {
 	keepAliveTicker := time.NewTicker(60 * time.Second)
-	updateCheckerTicker := time.NewTicker(30 * time.Second)
+	updateCheckerTicker := time.NewTicker(10 * time.Second)
 
 	for {
 		select {
@@ -476,16 +479,12 @@ func (h *Headscale) scheduledPollWorker(
 			keepAliveChan <- data
 
 		case <-updateCheckerTicker.C:
-			// Send an update request regardless of outdated or not, if data is sent
-			// to the node is determined in the updateChan consumer block
-			err := h.sendRequestOnUpdateChannel(m)
-			if err != nil {
-				log.Error().
-					Str("func", "keepAlive").
+			log.Debug().
+				Str("func", "scheduledPollWorker").
 				Str("machine", m.Name).
-					Err(err).
-					Msgf("Failed to send update request to %s", m.Name)
-			}
+				Msg("Sending update request")
+			updateRequestsFromNode.WithLabelValues(m.Name, m.Namespace.Name, "scheduled-update").Inc()
+			updateChan <- struct{}{}
 		}
 	}
 }