zones: finish scan sorting the content

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

pkg/zones/machine.go

@@ -82,3 +82,7 @@ func (m *Machine) getFilename(name string, args ...any) string {
 
 	return filepath.Join(s...)
 }
+
+func (m *Machine) getPeerByName(name string) (*Machine, bool) {
+	return m.zone.zones.GetMachineByName(name)
+}

pkg/zones/machine_rings.go

@@ -45,9 +45,77 @@ func (m *Machine) applyWireguardConfig(ring int, wg *wireguard.Config) error {
 		return err
 	}
 
+	if err := m.applyWireguardInterfaceConfig(ring, wg.Interface); err != nil {
+		err = core.Wrapf(err, "%s: wg%v:%s", m.Name, ring, addr)
+		return err
+	}
+
+	for _, peer := range wg.Peer {
+		if err := m.applyWireguardPeerConfig(ring, peer); err != nil {
+			err = core.Wrapf(err, "%s: wg%v:%s", m.Name, ring, addr)
+			return err
+		}
+	}
+
 	return nil
 }
 
+func (m *Machine) applyRingInfo(ring int, new *RingInfo) error {
+	var cur *RingInfo
+
+	for _, ri := range m.RingAddresses {
+		if ri.Ring == ring {
+			cur = ri
+			break
+		}
+	}
+
+	if cur == nil {
+		// first, append
+		m.RingAddresses = append(m.RingAddresses, new)
+		return nil
+	}
+
+	// extra, merge
+	return cur.Merge(new)
+}
+
+func (m *Machine) applyWireguardInterfaceConfig(ring int, data wireguard.InterfaceConfig) error {
+	ri := &RingInfo{
+		Ring:    ring,
+		Enabled: true,
+		Address: data.Address,
+		Keys: &wireguard.KeyPair{
+			PrivateKey: data.PrivateKey,
+		},
+	}
+
+	return m.applyRingInfo(ring, ri)
+}
+
+func (m *Machine) applyWireguardPeerConfig(ring int, pc wireguard.PeerConfig) error {
+	peer, found := m.getPeerByName(pc.Endpoint.Name())
+	switch {
+	case !found:
+		// unknown
+	case ring == 1 && m.zone != peer.zone:
+		// invalid zone
+	default:
+		// apply RingInfo
+		ri := &RingInfo{
+			Ring:    ring,
+			Enabled: true,
+			Keys: &wireguard.KeyPair{
+				PublicKey: pc.PublicKey,
+			},
+		}
+
+		return peer.applyRingInfo(ring, ri)
+	}
+
+	return fmt.Errorf("%q: invalid peer endpoint", pc.Endpoint.Host)
+}
+
 func (m *Machine) applyZoneNodeID(zoneID, nodeID int) error {
 	switch {
 	case zoneID == 0:

pkg/zones/rings.go

@@ -1,6 +1,7 @@
 package zones
 
 import (
+	"fmt"
 	"net/netip"
 
 	"git.jpi.io/amery/jpictl/pkg/wireguard"
@@ -24,6 +25,73 @@ type RingInfo struct {
 	Address netip.Addr         `toml:"address,omitempty"`
 }
 
+// Merge attempts to combine two RingInfo structs
+func (ri *RingInfo) Merge(alter *RingInfo) error {
+	switch {
+	case ri.Ring != alter.Ring:
+		// different ring
+		return fmt.Errorf("invalid %s: %v ≠ %v", "ring", ri.Ring, alter.Ring)
+	case ri.Enabled != alter.Enabled:
+		// different state
+		return fmt.Errorf("invalid %s: %v ≠ %v", "enabled", ri.Enabled, alter.Enabled)
+	case !canMergeAddress(ri.Address, alter.Address):
+		// different address
+		return fmt.Errorf("invalid %s: %v ≠ %v", "address", ri.Address, alter.Address)
+	case !canMergeKeyPairs(ri.Keys, alter.Keys):
+		// incompatible keypairs
+		return fmt.Errorf("invalid %s: %s ≠ %s", "keys", ri.Keys, alter.Keys)
+	}
+
+	switch {
+	case ri.Keys == nil:
+		// assign keypair
+		ri.Keys = alter.Keys
+	case alter.Keys != nil:
+		// fill the gaps on our keypair
+		if ri.Keys.PrivateKey.IsZero() {
+			ri.Keys.PrivateKey = alter.Keys.PrivateKey
+		}
+		if ri.Keys.PublicKey.IsZero() {
+			ri.Keys.PublicKey = alter.Keys.PublicKey
+		}
+	}
+
+	if addressEqual(ri.Address, netip.Addr{}) {
+		// assign address
+		ri.Address = alter.Address
+	}
+
+	return nil
+}
+
+func canMergeAddress(ip1, ip2 netip.Addr) bool {
+	var zero netip.Addr
+
+	switch {
+	case addressEqual(ip1, zero) || addressEqual(ip2, zero) || addressEqual(ip1, ip2):
+		return true
+	default:
+		return false
+	}
+}
+
+func addressEqual(ip1, ip2 netip.Addr) bool {
+	return ip1.Compare(ip2) == 0
+}
+
+func canMergeKeyPairs(p1, p2 *wireguard.KeyPair) bool {
+	switch {
+	case p1 == nil || p2 == nil:
+		return true
+	case !p1.PrivateKey.IsZero() && !p2.PrivateKey.IsZero() && !p1.PrivateKey.Equal(p2.PrivateKey):
+		return false
+	case !p1.PublicKey.IsZero() && !p2.PublicKey.IsZero() && !p1.PublicKey.Equal(p2.PublicKey):
+		return false
+	default:
+		return true
+	}
+}
+
 // RingAddressEncoder provides encoder/decoder access for a particular
 // Wireguard ring
 type RingAddressEncoder struct {

pkg/zones/scan.go

@@ -2,9 +2,25 @@ package zones
 
 import (
 	"io/fs"
+	"sort"
 )
 
 func (m *Zones) scan() error {
+	for _, fn := range []func() error{
+		m.scanDirectory,
+		m.scanMachines,
+		m.scanZoneIDs,
+		m.scanSort,
+	} {
+		if err := fn(); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (m *Zones) scanDirectory() error {
 	// each directory is a zone
 	entries, err := fs.ReadDir(m.dir, ".")
 	if err != nil {
@@ -26,7 +42,7 @@ func (m *Zones) scan() error {
 		}
 	}
 
-	return m.scanMachines()
+	return nil
 }
 
 func (m *Zones) scanMachines() error {
@@ -38,6 +54,67 @@ func (m *Zones) scanMachines() error {
 	return err
 }
 
+func (m *Zones) scanZoneIDs() error {
+	var hasMissing bool
+	var lastZoneID int
+
+	m.ForEachZone(func(z *Zone) bool {
+		switch {
+		case z.ID == 0:
+			hasMissing = true
+		case z.ID > lastZoneID:
+			lastZoneID = z.ID
+		}
+
+		return false
+	})
+
+	if hasMissing {
+		next := lastZoneID + 1
+
+		m.ForEachZone(func(z *Zone) bool {
+			if z.ID == 0 {
+				z.ID, next = next, next+1
+			}
+
+			return false
+		})
+	}
+
+	return nil
+}
+
+func (m *Zones) scanSort() error {
+	sort.SliceStable(m.Zones, func(i, j int) bool {
+		id1 := m.Zones[i].ID
+		id2 := m.Zones[j].ID
+		return id1 < id2
+	})
+
+	m.ForEachZone(func(z *Zone) bool {
+		sort.SliceStable(z.Machines, func(i, j int) bool {
+			id1 := z.Machines[i].ID()
+			id2 := z.Machines[j].ID()
+			return id1 < id2
+		})
+
+		return false
+	})
+
+	m.ForEachMachine(func(p *Machine) bool {
+		sort.SliceStable(p.RingAddresses, func(i, j int) bool {
+			ri1 := p.RingAddresses[i]
+			ri2 := p.RingAddresses[j]
+
+			return ri1.Ring < ri2.Ring
+		})
+
+		return false
+	})
+
+	return nil
+}
+
 func (z *Zone) scan() error {
 	// each directory is a machine
 	entries, err := fs.ReadDir(z.zones.dir, z.Name)

pkg/zones/zones.go

@@ -53,6 +53,24 @@ func (m *Zones) ForEachZone(fn func(*Zone) bool) {
 	}
 }
 
+// GetMachineByName looks for a machine with the specified
+// name on any zone
+func (m *Zones) GetMachineByName(name string) (*Machine, bool) {
+	var out *Machine
+
+	if name != "" {
+		m.ForEachMachine(func(p *Machine) bool {
+			if p.Name == name {
+				out = p
+			}
+
+			return out != nil
+		})
+	}
+
+	return out, out != nil
+}
+
 // NewFS builds a [Zones] tree using the given directory
 func NewFS(dir fs.FS, domain string) (*Zones, error) {
 	lockuper := resolver.NewCloudflareLookuper()