WIP

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

pkg/zones/rings.go

@@ -2,6 +2,7 @@ package zones
 
 import (
 	"fmt"
+	"io/fs"
 	"net/netip"
 
 	"git.jpi.io/amery/jpictl/pkg/wireguard"
@@ -179,3 +180,174 @@ func RingOneAddress(zoneID, nodeID int) (netip.Addr, bool) {
 		return netip.AddrFrom4(a4), true
 	}
 }
+
+var (
+	_ MachineIterator = (*Ring)(nil)
+)
+
+// A Ring describes all peers on a ring
+type Ring struct {
+	RingAddressEncoder
+
+	Peers []*RingPeer
+}
+
+// AddPeer adds a [Machine] to the ring
+func (r *Ring) AddPeer(p *Machine) bool {
+	_, ok := p.getRingInfo(r.ID)
+	if !ok {
+		return false
+	}
+
+	rp := r.newPeer(p)
+	r.Peers = append(r.Peers, rp)
+	return true
+}
+
+func (r *Ring) newPeer(p *Machine) *RingPeer {
+	nodeID := p.ID
+	zoneID := p.Zone()
+
+	ri, _ := p.getRingInfo(r.ID)
+	addr, _ := r.Encode(zoneID, nodeID)
+
+	rp := &RingPeer{
+		Node:       p,
+		Address:    addr,
+		PrivateKey: ri.Keys.PrivateKey,
+		PeerConfig: wireguard.PeerConfig{
+			PublicKey: ri.Keys.PublicKey,
+			Endpoint: wireguard.EndpointAddress{
+				Host: p.FullName(),
+				Port: r.Port,
+			},
+		},
+	}
+
+	if r.ID == 0 {
+		rp.AllowRingOneNetwork(zoneID)
+		rp.AllowIP(addr)
+	} else {
+		rp.AllowIP(addr)
+
+		if p.IsGateway() {
+			zones := p.zone.zones
+			rp.AllowOtherRingOneNetworks(zones, zoneID)
+			rp.AllowRingZeroGateways(zones)
+		}
+	}
+
+	return rp
+}
+
+// ForEachMachine calls a function for each Machine in the ring
+// until instructed to terminate the loop
+func (r *Ring) ForEachMachine(fn func(*Machine) bool) {
+	for _, pp := range r.Peers {
+		if fn(pp.Node) {
+			return
+		}
+	}
+}
+
+// ExportConfig ...
+func (r *Ring) ExportConfig(p *Machine) (*wireguard.Config, error) {
+	cur, ok := r.getMachine(p)
+	if !ok {
+		return nil, fs.ErrNotExist
+	}
+
+	out := &wireguard.Config{
+		Interface: wireguard.InterfaceConfig{
+			Address:    cur.Address,
+			PrivateKey: cur.PrivateKey,
+			ListenPort: r.Port,
+		},
+	}
+
+	for _, pp := range r.Peers {
+		if pp.Node != p {
+			pc := pp.PeerConfig
+			out.Peer = append(out.Peer, pc)
+		}
+	}
+	return out, nil
+}
+
+func (r *Ring) getMachine(p *Machine) (*RingPeer, bool) {
+	for _, pp := range r.Peers {
+		if pp.Node == p {
+			return pp, true
+		}
+	}
+
+	return nil, false
+}
+
+// A RingPeer is a node on a [Ring]
+type RingPeer struct {
+	Node *Machine
+
+	Address    netip.Addr
+	PrivateKey wireguard.PrivateKey
+	PeerConfig wireguard.PeerConfig
+}
+
+// AllowIP ...
+func (rp *RingPeer) AllowIP(addr netip.Addr) {
+	rp.PeerConfig.AllowedIPs = append(rp.PeerConfig.AllowedIPs,
+		netip.PrefixFrom(addr, 32),
+	)
+}
+
+// AllowNetwork ...
+func (rp *RingPeer) AllowNetwork(addr netip.Addr, bits int) {
+	rp.PeerConfig.AllowedIPs = append(rp.PeerConfig.AllowedIPs,
+		netip.PrefixFrom(addr, bits),
+	)
+}
+
+// AllowRingOneNetwork ...
+func (rp *RingPeer) AllowRingOneNetwork(zoneID int) {
+	addr, _ := RingOneAddress(zoneID, 0)
+	rp.AllowNetwork(addr, 12)
+}
+
+// AllowOtherRingOneNetworks ...
+func (rp *RingPeer) AllowOtherRingOneNetworks(m *Zones, zoneID int) {
+	m.ForEachZone(func(z *Zone) bool {
+		if z.ID != zoneID {
+			addr, _ := RingOneAddress(z.ID, 0)
+			rp.AllowNetwork(addr, 12)
+		}
+		return false
+	})
+}
+
+// AllowRingZeroGateways ...
+func (rp *RingPeer) AllowRingZeroGateways(m *Zones) {
+	m.ForEachMachine(func(p *Machine) bool {
+		switch {
+		case !p.IsGateway():
+			// skip regular nodes
+		default:
+			addr, _ := RingZeroAddress(p.Zone(), p.ID)
+			rp.AllowIP(addr)
+		}
+		return false
+	})
+}
+
+// NewRing ...
+func NewRing(m MachineIterator, ring int) (*Ring, error) {
+	r := &Ring{
+		RingAddressEncoder: Rings[ring],
+	}
+
+	m.ForEachMachine(func(p *Machine) bool {
+		r.AddPeer(p)
+		return false
+	})
+
+	return r, nil
+}