WIP

Signed-off-by: Alejandro Mery <amery@jpi.io>

pkg/zones/env.go

@@ -32,11 +32,14 @@ func (m *Zones) writeEnvZone(w io.Writer, z *Zone) {
 
 	// ZONE{zoneID}_GW
 	gatewayID := getRingZeroGatewayID(z)
-	m.writeEnvVar(w, fmt.Sprintf("%v", gatewayID), "ZONE%v_%s", zoneID, "GW")
+	if gatewayID > 0 {
+		m.writeEnvVar(w, fmt.Sprintf("%v", gatewayID), "ZONE%v_%s", zoneID, "GW")
 
-	// ZONE{zoneID}_IP
-	ip, _ := RingZeroAddress(zoneID, gatewayID)
-	m.writeEnvVar(w, ip.String(), "ZONE%v_%s", zoneID, "IP")
+		// ZONE{zoneID}_IP
+		if ip, ok := RingZeroAddress(zoneID, gatewayID); ok {
+			m.writeEnvVar(w, ip.String(), "ZONE%v_%s", zoneID, "IP")
+		}
+	}
 }
 
 func (m *Zones) writeEnvVarFn(w io.Writer, fn func(*Zones) string, name string, args ...any) {
@@ -79,13 +82,9 @@ func genEnvZoneNodes(z *Zone) string {
 }
 
 func getRingZeroGatewayID(z *Zone) int {
-	var firstNodeID, gatewayID int
+	var gatewayID int
 
 	z.ForEachMachine(func(p *Machine) bool {
-		if firstNodeID == 0 {
-			firstNodeID = p.ID
-		}
-
 		if p.IsGateway() {
 			gatewayID = p.ID
 		}
@@ -93,10 +92,5 @@ func getRingZeroGatewayID(z *Zone) int {
 		return gatewayID != 0
 	})
 
-	switch {
-	case gatewayID == 0:
-		return firstNodeID
-	default:
-		return gatewayID
-	}
+	return gatewayID
 }

pkg/zones/machine.go

@@ -39,6 +39,24 @@ func (m *Machine) IsGateway() bool {
 	return ok
 }
 
+// SetGateway enables/disables a Machine ring0 integration
+func (m *Machine) SetGateway(enabled bool) error {
+	ri, found := m.getRingInfo(0)
+	switch {
+	case !found && !enabled:
+		return nil
+	case !found:
+		var err error
+
+		if ri, err = m.createRingInfo(0, false); err != nil {
+			return err
+		}
+	}
+
+	ri.Enabled = enabled
+	return m.syncRingConfig(0)
+}
+
 func (m *Machine) getPeerByName(name string) (*Machine, bool) {
 	return m.zone.zones.GetMachineByName(name)
 }

pkg/zones/machine_rings.go

@@ -105,6 +105,28 @@ func (m *Machine) WriteWireguardKeys(ring int) error {
 	return nil
 }
 
+// RemoveWireguardKeys deletes wgN.key and wgN.pub from
+// the machine's config directory
+func (m *Machine) RemoveWireguardKeys(ring int) error {
+	var err error
+
+	err = m.RemoveFile("wg%v.pub", ring)
+	switch {
+	case os.IsNotExist(err):
+		// ignore
+	case err != nil:
+		return err
+	}
+
+	err = m.RemoveFile("wg%v.key", ring)
+	if os.IsNotExist(err) {
+		// ignore
+		err = nil
+	}
+
+	return err
+}
+
 // GetWireguardConfig reads a wgN.conf file
 func (m *Machine) GetWireguardConfig(ring int) (*wireguard.Config, error) {
 	data, err := m.ReadFile("wg%v.conf", ring)
@@ -228,3 +250,68 @@ func (m *Machine) applyZoneNodeID(zoneID, nodeID int) error {
 
 	return nil
 }
+
+// RemoveWireguardConfig deletes wgN.conf from the machine's
+// config directory.
+func (m *Machine) RemoveWireguardConfig(ring int) error {
+	err := m.RemoveFile("wg%v.conf", ring)
+	if os.IsNotExist(err) {
+		err = nil
+	}
+
+	return err
+}
+
+func (*Machine) syncRingConfig(_ int) error {
+	// _, err := m.getRingNodes(ring)
+	return nil
+}
+
+func (m *Machine) createRingInfo(ring int, enabled bool) (*RingInfo, error) {
+	keys, err := wireguard.NewKeyPair()
+	if err != nil {
+		return nil, err
+	}
+
+	ri := &RingInfo{
+		Ring:    ring,
+		Enabled: enabled,
+		Keys:    keys,
+	}
+
+	err = m.applyRingInfo(ring, ri)
+	if err != nil {
+		return nil, err
+	}
+
+	return ri, nil
+}
+
+func (m *Machine) writeRingInfo(ri *RingInfo) error {
+	var err error
+
+	if m == nil || ri == nil {
+		return fs.ErrInvalid
+	}
+
+	err = m.WriteWireguardKeys(ri.Ring)
+	if err != nil {
+		return err
+	}
+
+	if !ri.Enabled {
+		return m.RemoveWireguardConfig(ri.Ring)
+	}
+
+	return m.writeRingInfoConf(ri.Ring, ri.Keys.PrivateKey)
+}
+
+func (m *Machine) writeRingInfoConf(ring int, _ wireguard.PrivateKey) error {
+	f, err := m.CreateTruncFile("wg%v.conf", ring)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	return nil
+}

pkg/zones/zones.go

@@ -3,6 +3,7 @@ package zones
 
 import (
 	"io/fs"
+	"path/filepath"
 
 	"github.com/hack-pad/hackpadfs/os"
 
@@ -33,6 +34,31 @@ func (z *Zone) ForEachMachine(fn func(*Machine) bool) {
 	}
 }
 
+// SetGateway configures a machine to be the zone's ring0 gateway
+func (z *Zone) SetGateway(gatewayID int, enabled bool) error {
+	var err error
+	var found bool
+
+	z.ForEachMachine(func(p *Machine) bool {
+		if p.ID == gatewayID {
+			found = true
+			err = p.SetGateway(enabled)
+
+			return true
+		}
+		return false
+	})
+
+	switch {
+	case err != nil:
+		return err
+	case !found:
+		return fs.ErrNotExist
+	default:
+		return nil
+	}
+}
+
 // Zones represents all zones in a cluster
 type Zones struct {
 	dir      fs.FS
@@ -105,7 +131,12 @@ func NewFS(dir fs.FS, domain string) (*Zones, error) {
 
 // New builds a [Zones] tree using the given directory
 func New(dir, domain string) (*Zones, error) {
-	base, err := os.NewFS().Sub(dir)
+	dir, err := filepath.Abs(dir)
+	if err != nil {
+		return nil, err
+	}
+
+	base, err := os.NewFS().Sub(dir[1:])
 	if err != nil {
 		return nil, err
 	}