zones: RingInfo [WIP]

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

cmd/jpictl/env.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"os"
+
+	"github.com/spf13/cobra"
+
+	"git.jpi.io/amery/jpictl/pkg/zones"
+)
+
+// Command
+var envCmd = &cobra.Command{
+	Use:   "env",
+	Short: "generates environment variables for shell scripts",
+	RunE: func(_ *cobra.Command, _ []string) error {
+		m, err := zones.New(cfg.Base, cfg.Domain)
+		if err != nil {
+			return err
+		}
+
+		return m.WriteEnv(os.Stdout)
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(envCmd)
+}

pkg/wireguard/keys.go

@@ -0,0 +1,30 @@
+package wireguard
+
+import (
+	"encoding/base64"
+)
+
+// BinaryKey is a binary blob
+type BinaryKey []byte
+
+func (k BinaryKey) String() string {
+	return base64.StdEncoding.EncodeToString(k)
+}
+
+// IsZero tells if the key hasn't been set
+func (k BinaryKey) IsZero() bool {
+	return len(k) == 0
+}
+
+// BinaryKeyFromBase64 decodes a base64-based string into
+// a [BinaryKey]
+func BinaryKeyFromBase64(data string) (BinaryKey, error) {
+	b, err := base64.StdEncoding.DecodeString(data)
+	return BinaryKey(b), err
+}
+
+// KeyPair holds a Key pair
+type KeyPair struct {
+	PrivateKey BinaryKey
+	PublicKey  BinaryKey
+}

pkg/zones/env.go

@@ -0,0 +1,9 @@
+// Package zones abstracts the cluster zones
+package zones
+
+import "io"
+
+// WriteEnv generates environment variables for shell scripts
+func (*Zones) WriteEnv(io.Writer) error {
+	return nil
+}

pkg/zones/machine_scan.go

@@ -1,11 +1,86 @@
 package zones
 
 import (
+	"bytes"
 	"context"
+	"fmt"
+	"log"
 	"net/netip"
+	"os"
 	"time"
+
+	"git.jpi.io/amery/jpictl/pkg/wireguard"
 )
 
+// GetWireguardConfig reads a wgN.conf file
+func (m *Machine) GetWireguardConfig(ring int) (*wireguard.Config, error) {
+	data, err := m.ReadFile("wg%v.conf", ring)
+	if err != nil {
+		return nil, err
+	}
+
+	r := bytes.NewReader(data)
+	return wireguard.NewConfigFromReader(r)
+}
+
+func (m *Machine) tryWireguardZeroConfig() error {
+	wg, err := m.GetWireguardConfig(0)
+	switch {
+	case os.IsNotExist(err):
+		return nil
+	case err != nil:
+		return err
+	default:
+		return m.applyWireguardZeroConfig(wg)
+	}
+}
+
+func (m *Machine) applyWireguardZeroConfig(wg *wireguard.Config) error {
+	addr := wg.GetAddress()
+	zoneID, nodeID, ok := ParseRingZeroAddress(addr)
+	if !ok {
+		return fmt.Errorf("%s: invalid %s address: %s", m.Name, "wg1", addr)
+	}
+
+	if err := m.applyZoneNodeID(zoneID, nodeID); err != nil {
+		return err
+	}
+
+	log.Println(m.Name, "wg0", addr, zoneID, nodeID)
+	return nil
+}
+
+func (m *Machine) tryWireguardOneConfig() error {
+	wg, err := m.GetWireguardConfig(1)
+	switch {
+	case os.IsNotExist(err):
+		return nil
+	case err != nil:
+		return err
+	default:
+		return m.applyWireguardOneConfig(wg)
+	}
+}
+
+func (m *Machine) applyWireguardOneConfig(wg *wireguard.Config) error {
+	addr := wg.GetAddress()
+	zoneID, nodeID, ok := ParseRingOneAddress(addr)
+	if !ok {
+		return fmt.Errorf("%s: invalid %s address: %s", m.Name, "wg1", addr)
+	}
+
+	if err := m.applyZoneNodeID(zoneID, nodeID); err != nil {
+		return err
+	}
+
+	log.Println(m.Name, "wg1", addr, zoneID, nodeID)
+	return nil
+}
+
+func (*Machine) applyZoneNodeID(_, _ int) error {
+	return nil
+}
+
 func (m *Machine) lookupNetIP() ([]netip.Addr, error) {
 	timeout := 2 * time.Second
 	ctx, cancel := context.WithTimeout(context.Background(), timeout)
@@ -26,5 +101,13 @@ func (m *Machine) updatePublicAddresses() error {
 }
 
 func (m *Machine) scan() error {
+	if err := m.tryWireguardZeroConfig(); err != nil {
+		return err
+	}
+
+	if err := m.tryWireguardOneConfig(); err != nil {
+		return err
+	}
+
 	return m.updatePublicAddresses()
 }

pkg/zones/rings.go

@@ -1,6 +1,10 @@
 package zones
 
-import "net/netip"
+import (
+	"net/netip"
+
+	"git.jpi.io/amery/jpictl/pkg/wireguard"
+)
 
 const (
 	// MaxZoneID indicates the highest ID allowed for a Zone
@@ -11,6 +15,15 @@ const (
 	RingsCount = 2
 )
 
+// RingInfo contains represents the Wireguard endpoint details
+// for a Machine on a particular ring
+type RingInfo struct {
+	Ring    int
+	Enabled bool
+	Keys    *wireguard.KeyPair
+	Address netip.Addr
+}
+
 // RingAddressEncoder provides encoder/decoder access for a particular
 // Wireguard ring
 type RingAddressEncoder struct {