Merge pull request 'cluster: introduce Machine.Inactive flag' (#38)

Reviewed-on: #38

.vscode/settings.json

@@ -0,0 +1,15 @@
+{
+    "cSpell.words": [
+        "asciigoat",
+        "ceph",
+        "cyclomatic",
+        "darvaza",
+        "gofrs",
+        "jpictl",
+        "libdns",
+        "Lookuper",
+        "publicsuffix",
+        "Wrapf",
+        "zerolog"
+    ]
+}

cmd/jpictl/config.go

@@ -1,19 +1,82 @@
 package main
 
-import "git.jpi.io/amery/jpictl/pkg/zones"
+import (
+	"os"
+
+	"darvaza.org/core"
+
+	"git.jpi.io/amery/jpictl/pkg/cluster"
+)
+
+const (
+	// DefaultConfigFile is read if -f/--config-file isn't specified.
+	// If it doesn't exist, m/ will be scanned
+	DefaultConfigFile = "cloud.yaml"
+
+	// DefaultClusterDir is the directory we will scan and write
+	// unless something else is indicated
+	DefaultClusterDir = "m"
+
+	// DefaultDomain indicates the domain to use unless
+	// something else is specified
+	DefaultDomain = "jpi.cloud"
+)
 
 // Config describes the repository
 type Config struct {
 	Base   string
 	Domain string
+
+	ConfigFile string
 }
 
+var forceScan bool
+
 var cfg = &Config{
-	Base:   "./m",
-	Domain: "m.jpi.cloud",
+	Base:   DefaultClusterDir,
+	Domain: DefaultDomain,
 }
 
 // LoadZones loads all zones and machines in the config directory
-func (cfg *Config) LoadZones() (*zones.Zones, error) {
-	return zones.New(cfg.Base, cfg.Domain)
+// or file
+func (cfg *Config) LoadZones(resolve bool) (*cluster.Cluster, error) {
+	var zones *cluster.Cluster
+	var err error
+
+	if !forceScan {
+		// try config file first
+		zones, err = cluster.NewFromConfig(cfg.ConfigFile,
+			cluster.ResolvePublicAddresses(resolve),
+			cluster.WithLogger(log),
+		)
+
+		switch {
+		case err == nil:
+			// file was good
+			return zones, nil
+		case !os.IsNotExist(err) || cfg.ConfigFile != DefaultConfigFile:
+			// file was bad
+			return nil, core.Wrap(err, "NewFromConfig(%q)", cfg.ConfigFile)
+		}
+	}
+
+	// default file doesn't exist. scan instead.
+	return cluster.NewFromDirectory(cfg.Base, cfg.Domain,
+		cluster.ResolvePublicAddresses(resolve),
+		cluster.WithLogger(log),
+	)
+}
+
+func init() {
+	flags := rootCmd.PersistentFlags()
+
+	flags.StringVarP(&cfg.Base, "scan-dir", "d",
+		DefaultClusterDir, "directory to scan for cluster data")
+	flags.StringVarP(&cfg.Domain, "domain", "D",
+		DefaultDomain, "domain to use for scanned data")
+	flags.StringVarP(&cfg.ConfigFile, "config-file", "f",
+		DefaultConfigFile, "config file (JSON or YAML)")
+
+	flags.BoolVarP(&forceScan, "force-scan", "S",
+		false, "ignore config file and scan the directory instead")
 }

cmd/jpictl/dns.go

@@ -0,0 +1,193 @@
+package main
+
+import (
+	"context"
+	"net/netip"
+	"os"
+	"time"
+
+	"darvaza.org/core"
+	"github.com/spf13/cobra"
+
+	"git.jpi.io/amery/jpictl/pkg/cluster"
+	"git.jpi.io/amery/jpictl/pkg/dns"
+)
+
+const (
+	// DNSSyncTimeout specifies how long are we willing to wait for a DNS
+	// synchronization
+	DNSSyncTimeout = 10 * time.Second
+)
+
+func newDNSManager(m *cluster.Cluster, provider dns.Provider) (*dns.Manager, error) {
+	domain := m.Domain
+	if m.Name != "" {
+		domain = m.Name + "." + domain
+	}
+
+	mgr, err := dns.NewManager(dns.WithDomain(domain), dns.WithLogger(log))
+	if err != nil {
+		return nil, err
+	}
+
+	if provider != nil {
+		// set provider only  if specified
+		err = dns.WithProvider(provider)(mgr)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if err := populateDNSManager(mgr, m); err != nil {
+		return nil, err
+	}
+
+	return mgr, nil
+}
+
+func populateDNSManager(mgr *dns.Manager, m *cluster.Cluster) error {
+	var err error
+
+	ctx := context.TODO()
+
+	m.ForEachZone(func(z *cluster.Zone) bool {
+		z.ForEachMachine(func(p *cluster.Machine) bool {
+			err = mgr.AddHost(ctx, z.Name, p.ID, p.IsActive(), p.PublicAddresses...)
+			return err != nil
+		})
+
+		return err != nil
+	})
+	if err != nil {
+		return err
+	}
+
+	m.ForEachRegion(func(r *cluster.Region) bool {
+		r.ForEachZone(func(z *cluster.Zone) bool {
+			err = mgr.AddRegion(ctx, r.Name, z.Name)
+			return err != nil
+		})
+
+		return err != nil
+	})
+
+	return err
+}
+
+// revive:disable:flag-parameter
+func newDNSManagerCommand(_ *cobra.Command,
+	resolve bool, withCredentials bool) (*dns.Manager, error) {
+	// revive:enable:flag-parameter
+	var cred dns.Provider
+
+	if withCredentials {
+		var err error
+
+		cred, err = dns.DefaultDNSProvider()
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	m, err := cfg.LoadZones(resolve)
+	if err != nil {
+		return nil, err
+	}
+
+	return newDNSManager(m, cred)
+}
+
+// Command
+var dnsCmd = &cobra.Command{
+	Use: "dns",
+}
+
+var dnsWriteCmd = &cobra.Command{
+	Use:    "write",
+	Short:  "dns write generates public DNS records",
+	PreRun: setVerbosity,
+	RunE: func(cmd *cobra.Command, _ []string) error {
+		mgr, err := newDNSManagerCommand(cmd, true, false)
+		if err != nil {
+			return err
+		}
+
+		_, err = mgr.WriteTo(os.Stdout)
+		return err
+	},
+}
+
+var dnsSyncCmd = &cobra.Command{
+	Use:    "sync",
+	Short:  "dns sync updates public DNS records",
+	PreRun: setVerbosity,
+	RunE: func(cmd *cobra.Command, _ []string) error {
+		mgr, err := newDNSManagerCommand(cmd, true, true)
+		if err != nil {
+			return err
+		}
+
+		ctx, cancel := context.WithTimeout(context.Background(), DNSSyncTimeout)
+		defer cancel()
+
+		return mgr.Sync(ctx)
+	},
+}
+
+var dnsShowCmd = &cobra.Command{
+	Use:    "show [<name>...]",
+	Short:  "dns show lists entries on DNS for our domain",
+	PreRun: setVerbosity,
+	RunE: func(cmd *cobra.Command, args []string) error {
+		mgr, err := newDNSManagerCommand(cmd, true, true)
+		if err != nil {
+			return err
+		}
+
+		ctx, cancel := context.WithTimeout(context.Background(), DNSSyncTimeout)
+		defer cancel()
+
+		return mgr.Show(ctx, args...)
+	},
+}
+
+var dnsAddCmd = &cobra.Command{
+	Use:    "add <name> <address..>",
+	Short:  "dns add registers a new machine on the public DNS",
+	Args:   cobra.MinimumNArgs(2),
+	PreRun: setVerbosity,
+	RunE: func(cmd *cobra.Command, args []string) error {
+		var addrs []netip.Addr
+
+		for _, s := range args[1:] {
+			addr, err := core.ParseAddr(s)
+			switch {
+			case err != nil:
+				return core.Wrap(err, s)
+			case !addr.IsValid(), addr.IsUnspecified(), addr.IsPrivate(), addr.IsMulticast():
+				return core.Wrap(core.ErrInvalid, s)
+			default:
+				addrs = append(addrs, addr)
+			}
+		}
+
+		mgr, err := newDNSManagerCommand(cmd, true, true)
+		if err != nil {
+			return err
+		}
+
+		ctx, cancel := context.WithTimeout(context.Background(), DNSSyncTimeout)
+		defer cancel()
+
+		return mgr.Add(ctx, args[0], addrs...)
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(dnsCmd)
+
+	dnsCmd.AddCommand(dnsWriteCmd)
+	dnsCmd.AddCommand(dnsSyncCmd)
+	dnsCmd.AddCommand(dnsShowCmd)
+	dnsCmd.AddCommand(dnsAddCmd)
+}

cmd/jpictl/dump.go

@@ -6,7 +6,6 @@ import (
 	"io"
 	"os"
 
-	"github.com/burntSushi/toml"
 	"github.com/spf13/cobra"
 	"gopkg.in/yaml.v3"
 )
@@ -20,8 +19,8 @@ type Encoder interface {
 type Encoding int
 
 const (
-	// TOMLEncoding represents TOML encoding
-	TOMLEncoding Encoding = iota
+	// UndefinedEncoding implies the default encoding
+	UndefinedEncoding Encoding = iota
 	// JSONEncoding represents JSON encoding
 	JSONEncoding
 	// YAMLEncoding represents YAML encoding
@@ -42,23 +41,18 @@ func NewYAMLEncoder(w io.Writer) Encoder {
 	return enc
 }
 
-// NewTOMLEncoder returns a TOML [Encoder] to work on the given [io.Writer]
-func NewTOMLEncoder(w io.Writer) Encoder {
-	enc := toml.NewEncoder(w)
-	return enc
-}
-
 const encoding = YAMLEncoding
 
 // Command
 var dumpCmd = &cobra.Command{
-	Use:   "dump",
-	Short: "generates a text representation of the config",
+	Use:    "dump",
+	Short:  "generates a text representation of the config",
+	PreRun: setVerbosity,
 	RunE: func(_ *cobra.Command, _ []string) error {
 		var buf bytes.Buffer
 		var enc Encoder
 
-		m, err := cfg.LoadZones()
+		m, err := cfg.LoadZones(true)
 		if err != nil {
 			return err
 		}
@@ -66,10 +60,8 @@ var dumpCmd = &cobra.Command{
 		switch encoding {
 		case JSONEncoding:
 			enc = NewJSONEncoder(&buf)
-		case YAMLEncoding:
-			enc = NewYAMLEncoder(&buf)
 		default:
-			enc = NewTOMLEncoder(&buf)
+			enc = NewYAMLEncoder(&buf)
 		}
 
 		if err = enc.Encode(m); err != nil {

cmd/jpictl/env.go

@@ -8,18 +8,32 @@ import (
 
 // Command
 var envCmd = &cobra.Command{
-	Use:   "env",
-	Short: "generates environment variables for shell scripts",
+	Use:    "env",
+	Short:  "generates environment variables for shell scripts",
+	PreRun: setVerbosity,
 	RunE: func(_ *cobra.Command, _ []string) error {
-		m, err := cfg.LoadZones()
+		m, err := cfg.LoadZones(false)
 		if err != nil {
 			return err
 		}
 
-		return m.WriteEnv(os.Stdout)
+		env, err := m.Env(*envExport)
+		if err != nil {
+			return err
+		}
+		_, err = env.WriteTo(os.Stdout)
+		return err
 	},
 }
 
+// Command Flags
+var (
+	envExport *bool
+)
+
 func init() {
 	rootCmd.AddCommand(envCmd)
+
+	envExport = envCmd.PersistentFlags().BoolP("export", "e", false,
+		"export generated variables")
 }

cmd/jpictl/gateway.go

@@ -0,0 +1,170 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+
+	"github.com/spf13/cobra"
+
+	"git.jpi.io/amery/jpictl/pkg/cluster"
+)
+
+// Command
+var gatewayCmd = &cobra.Command{
+	Use:   "gateway",
+	Short: "gateway operates on ring0/ring1 gateways",
+}
+
+// gateway set
+var gatewaySetCmd = &cobra.Command{
+	Use:    "set",
+	Short:  "gateway set sets machines as gateways",
+	PreRun: setVerbosity,
+	RunE: func(_ *cobra.Command, args []string) error {
+		m, err := cfg.LoadZones(false)
+		if err != nil {
+			return err
+		}
+
+		for _, arg := range args {
+			err = gatewaySet(m, arg)
+			if err != nil {
+				return err
+			}
+		}
+		return nil
+	},
+}
+
+func gatewaySet(zi cluster.ZoneIterator, gw string) error {
+	var err error
+	zi.ForEachZone(func(z *cluster.Zone) bool {
+		for _, m := range z.Machines {
+			if m.Name == gw {
+				z.SetGateway(m.ID, true)
+				return true
+			}
+		}
+		err = fmt.Errorf("machine %s not found", gw)
+		return false
+	})
+	return err
+}
+
+// gateway unset
+var gatewayUnsetCmd = &cobra.Command{
+	Use:   "unset",
+	Short: "gateway unset sets machines as non-gateways",
+	RunE: func(_ *cobra.Command, args []string) error {
+		m, err := cfg.LoadZones(false)
+		if err != nil {
+			return err
+		}
+
+		for _, arg := range args {
+			err = gatewayUnset(m, arg)
+			if err != nil {
+				return err
+			}
+		}
+
+		return nil
+	},
+}
+
+func gatewayUnset(zi cluster.ZoneIterator, ngw string) error {
+	var err error
+	zi.ForEachZone(func(z *cluster.Zone) bool {
+		for _, m := range z.Machines {
+			if m.Name == ngw && m.IsGateway() {
+				z.SetGateway(m.ID, false)
+				m.RemoveWireguardConfig(0)
+				return true
+			}
+		}
+		err = fmt.Errorf("machine %s not found", ngw)
+		return false
+	})
+	return err
+}
+
+// gateway list
+var gatewayListCmd = &cobra.Command{
+	Use:   "list",
+	Short: "gateway list lists gateways",
+	RunE: func(_ *cobra.Command, args []string) error {
+		m, err := cfg.LoadZones(false)
+		if err != nil {
+			return err
+		}
+
+		switch {
+		case len(args) == 0:
+			return gatewayListAll(m)
+		default:
+			for _, arg := range args {
+				err = gatewayList(m, arg)
+				if err != nil {
+					return err
+				}
+			}
+			return nil
+		}
+	},
+}
+
+func gatewayListAll(zi cluster.ZoneIterator) error {
+	var b bytes.Buffer
+	var err error
+	zi.ForEachZone(func(z *cluster.Zone) bool {
+		b.WriteString(z.Name + ":")
+		var sIDs []string
+		ids, num := z.GatewayIDs()
+		if num == 0 {
+			err = fmt.Errorf("no gateway in zone %s", z.Name)
+			return false
+		}
+		for _, i := range ids {
+			sIDs = append(sIDs, strconv.Itoa(i))
+		}
+		b.WriteString(strings.Join(sIDs, ", "))
+		b.WriteString("\n")
+		_, err = b.WriteTo(os.Stdout)
+		return false
+	})
+	return err
+}
+
+func gatewayList(zi cluster.ZoneIterator, m string) error {
+	var b bytes.Buffer
+	var err error
+	zi.ForEachZone(func(z *cluster.Zone) bool {
+		if z.Name == m {
+			b.WriteString(z.Name + ":")
+			ids, num := z.GatewayIDs()
+			if num == 0 {
+				err = fmt.Errorf("no gateway in zone %s", z.Name)
+				return true
+			}
+
+			b.WriteString(fmt.Sprint(ids))
+			b.WriteString("\n")
+			_, err = b.WriteTo(os.Stdout)
+			return true
+		}
+		err = fmt.Errorf("zone %s not found", m)
+		return false
+	})
+	return err
+}
+
+func init() {
+	rootCmd.AddCommand(gatewayCmd)
+
+	gatewayCmd.AddCommand(gatewaySetCmd)
+	gatewayCmd.AddCommand(gatewayUnsetCmd)
+	gatewayCmd.AddCommand(gatewayListCmd)
+}

cmd/jpictl/log.go

@@ -5,11 +5,10 @@ import (
 
 	"darvaza.org/sidecar/pkg/logger/zerolog"
 	"darvaza.org/slog"
+	"github.com/spf13/cobra"
 )
 
-var (
-	log = zerolog.New(nil, slog.Debug)
-)
+var log = zerolog.New(nil, slog.Error)
 
 // fatal is a convenience wrapper for slog.Logger.Fatal().Print()
 func fatal(err error, msg string, args ...any) {
@@ -24,3 +23,20 @@ func fatal(err error, msg string, args ...any) {
 
 	panic("unreachable")
 }
+
+var verbosity int
+
+// setVerbosity replaces the global logger using the
+// verbosity level specified via -v flags
+func setVerbosity(_ *cobra.Command, _ []string) {
+	desired := int8(slog.Error) + int8(verbosity)
+	if desired > 6 {
+		desired = 6
+	}
+	log = zerolog.New(nil, slog.LogLevel(desired))
+}
+
+func init() {
+	rootCmd.PersistentFlags().CountVarP(&verbosity, "verbosity", "v",
+		"increase the verbosity level to Warn, Info or Debug")
+}

cmd/jpictl/main.go

@@ -10,10 +10,12 @@ const (
 	CmdName = "jpictl"
 )
 
-var rootCmd = &cobra.Command{
-	Use:   CmdName,
-	Short: "control tool for jpi.cloud",
-}
+var (
+	rootCmd = &cobra.Command{
+		Use:   CmdName,
+		Short: "control tool for jpi.cloud",
+	}
+)
 
 func main() {
 	if err := rootCmd.Execute(); err != nil {

cmd/jpictl/write.go

@@ -6,10 +6,11 @@ import (
 
 // Command
 var writeCmd = &cobra.Command{
-	Use:   "write",
-	Short: "rewrites all config files",
+	Use:    "write",
+	Short:  "rewrites all config files",
+	PreRun: setVerbosity,
 	RunE: func(_ *cobra.Command, _ []string) error {
-		m, err := cfg.LoadZones()
+		m, err := cfg.LoadZones(false)
 		if err != nil {
 			return err
 		}

go.mod

@@ -3,42 +3,50 @@ module git.jpi.io/amery/jpictl
 go 1.19
 
 require (
-	darvaza.org/core v0.9.5
-	darvaza.org/resolver v0.5.2
-	darvaza.org/sidecar v0.0.0-20230721122716-b9c54b8adbaf
-	darvaza.org/slog v0.5.2
-	github.com/burntSushi/toml v0.3.1
+	asciigoat.org/ini v0.2.5
+	darvaza.org/core v0.10.0
+	darvaza.org/resolver v0.5.8
+	darvaza.org/sidecar v0.0.8
+	darvaza.org/slog v0.5.4
+	darvaza.org/slog/handlers/discard v0.4.6
+	github.com/gofrs/uuid/v5 v5.0.0
 	github.com/hack-pad/hackpadfs v0.2.1
-	github.com/mgechev/revive v1.3.2
+	github.com/libdns/cloudflare v0.1.0
+	github.com/libdns/libdns v0.2.1
+	github.com/mgechev/revive v1.3.4
 	github.com/spf13/cobra v1.7.0
-	golang.org/x/crypto v0.12.0
+	golang.org/x/crypto v0.14.0
+	golang.org/x/net v0.17.0
 	gopkg.in/gcfg.v1 v1.2.3
 	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
-	darvaza.org/slog/handlers/filter v0.4.4 // indirect
-	darvaza.org/slog/handlers/zerolog v0.4.4 // indirect
+	asciigoat.org/core v0.3.9 // indirect
+	darvaza.org/slog/handlers/filter v0.4.6 // indirect
+	darvaza.org/slog/handlers/zerolog v0.4.6 // indirect
 	github.com/BurntSushi/toml v1.3.2 // indirect
-	github.com/chavacava/garif v0.0.0-20230227094218-b8c73b2037b8 // indirect
+	github.com/chavacava/garif v0.1.0 // indirect
 	github.com/fatih/color v1.15.0 // indirect
 	github.com/fatih/structtag v1.2.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/kr/pretty v0.3.1 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
-	github.com/mattn/go-isatty v0.0.19 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mattn/go-runewidth v0.0.15 // indirect
 	github.com/mgechev/dots v0.0.0-20210922191527-e955255bf517 // indirect
-	github.com/miekg/dns v1.1.55 // indirect
+	github.com/miekg/dns v1.1.56 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/olekukonko/tablewriter v0.0.5 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/rivo/uniseg v0.4.4 // indirect
-	github.com/rs/zerolog v1.30.0 // indirect
+	github.com/rogpeppe/go-internal v1.10.1-0.20230524175051-ec119421bb97 // indirect
+	github.com/rs/zerolog v1.31.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
-	golang.org/x/mod v0.12.0 // indirect
-	golang.org/x/net v0.14.0 // indirect
-	golang.org/x/sys v0.11.0 // indirect
-	golang.org/x/text v0.12.0 // indirect
-	golang.org/x/tools v0.12.0 // indirect
+	golang.org/x/mod v0.13.0 // indirect
+	golang.org/x/sys v0.13.0 // indirect
+	golang.org/x/text v0.13.0 // indirect
+	golang.org/x/tools v0.14.0 // indirect
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
 )

go.sum

@@ -1,23 +1,28 @@
-darvaza.org/core v0.9.5 h1:sS5pZFwicaxJIQixEiqkMr9GknVHYL+EbKDMkR/4jDM=
-darvaza.org/core v0.9.5/go.mod h1:O3tHBMlw+xB47uGh5CUx7dXAujBAMmD8BCRFPZmIw54=
-darvaza.org/resolver v0.5.2 h1:VjHhEr/MJBszeDb7tYlXQ9Bsyh4xrDR7Sd10WAmPD6k=
-darvaza.org/resolver v0.5.2/go.mod h1:fFvsVPEFeMzUIWlLG47Go/6uJYtRLb9R8HIgYg3uaxE=
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@@ -26,30 +31,44 @@ github.com/fatih/color v1.15.0/go.mod h1:0h5ZqXfHYED7Bhv2ZJamyIOUej9KtShiJESRwBD
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@@ -57,9 +76,12 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
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@@ -70,28 +92,28 @@ github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSS
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-golang.org/x/text v0.12.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
-golang.org/x/tools v0.12.0 h1:YW6HUoUmYBpwSgyaGaZq1fHjrBjX1rlpZ54T6mu2kss=
-golang.org/x/tools v0.12.0/go.mod h1:Sc0INKfu04TlqNoRA1hgpFZbhYXHPr4V5DzpSBTPqQM=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
+golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/text v0.13.0 h1:ablQoSUd0tRdKxZewP80B+BaqeKJuVhuRxj/dkrun3k=
+golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
+golang.org/x/tools v0.14.0 h1:jvNa2pY0M4r62jkRQ6RwEZZyPcymeL9XZMLBbV7U2nc=
+golang.org/x/tools v0.14.0/go.mod h1:uYBEerGOWcJyEORxN+Ek8+TT266gXkNlHdJBwexUsBg=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/gcfg.v1 v1.2.3 h1:m8OOJ4ccYHnx2f4gQwpno8nAX5OGOh7RLaaz0pj3Ogs=
 gopkg.in/gcfg.v1 v1.2.3/go.mod h1:yesOnuUOFQAhST5vPY4nbZsb/huCgGGXlipJsBn0b3o=
 gopkg.in/warnings.v0 v0.1.2 h1:wFXVbFY8DY5/xOe1ECiWdKCzZlxgshcYVNkBHstARME=

pkg/ceph/ceph.go

@@ -0,0 +1,2 @@
+// Package ceph deals with ceph config
+package ceph

pkg/ceph/config.go

@@ -0,0 +1,67 @@
+package ceph
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"net/netip"
+	"strings"
+
+	"github.com/gofrs/uuid/v5"
+
+	"asciigoat.org/ini/basic"
+)
+
+// Config represents a ceph.conf file
+type Config struct {
+	Global GlobalConfig `ini:"global"`
+}
+
+// GlobalConfig represents the [global] section of a ceph.conf file
+type GlobalConfig struct {
+	FSID           uuid.UUID    `ini:"fsid"`
+	Monitors       []string     `ini:"mon_initial_members,comma"`
+	MonitorsAddr   []netip.Addr `ini:"mon_host,comma"`
+	ClusterNetwork netip.Prefix `ini:"cluster_network"`
+}
+
+// WriteTo writes a Wireguard [Config] onto the provided [io.Writer]
+func (cfg *Config) WriteTo(w io.Writer) (int64, error) {
+	var buf bytes.Buffer
+
+	writeGlobalToBuffer(&buf, &cfg.Global)
+	return buf.WriteTo(w)
+}
+
+func writeGlobalToBuffer(w *bytes.Buffer, c *GlobalConfig) {
+	_, _ = w.WriteString("[global]\n")
+	_, _ = fmt.Fprintf(w, "%s = %s\n", "fsid", c.FSID.String())
+	_, _ = fmt.Fprintf(w, "%s = %s\n", "mon_initial_members", strings.Join(c.Monitors, ", "))
+	_, _ = fmt.Fprintf(w, "%s = %s\n", "mon_host", joinAddrs(c.MonitorsAddr, ", "))
+	_, _ = fmt.Fprintf(w, "%s = %s\n", "cluster_network", c.ClusterNetwork.String())
+}
+
+func joinAddrs(addrs []netip.Addr, sep string) string {
+	s := make([]string, len(addrs))
+
+	for i, addr := range addrs {
+		s[i] = addr.String()
+	}
+
+	return strings.Join(s, sep)
+}
+
+// NewConfigFromReader parses the ceph.conf file
+func NewConfigFromReader(r io.Reader) (*Config, error) {
+	doc, err := basic.Decode(r)
+	if err != nil {
+		return nil, err
+	}
+
+	cfg, err := newConfigFromDocument(doc)
+	if err != nil {
+		return nil, err
+	}
+
+	return cfg, nil
+}

pkg/ceph/config_parser.go

@@ -0,0 +1,110 @@
+package ceph
+
+import (
+	"io/fs"
+	"net/netip"
+
+	"asciigoat.org/ini/basic"
+	"asciigoat.org/ini/parser"
+
+	"darvaza.org/core"
+)
+
+var sectionMap = map[string]func(*Config, *basic.Section) error{
+	"global": loadGlobalConfSection,
+}
+
+func loadConfSection(out *Config, src *basic.Section) error {
+	h, ok := sectionMap[src.Key]
+	if !ok {
+		return core.Wrap(fs.ErrInvalid, "unknown section %q", src.Key)
+	}
+
+	return h(out, src)
+}
+
+func loadGlobalConfSection(out *Config, src *basic.Section) error {
+	var cfg GlobalConfig
+
+	for _, field := range src.Fields {
+		if err := loadGlobalConfField(&cfg, field); err != nil {
+			return core.Wrap(err, "global")
+		}
+	}
+
+	out.Global = cfg
+	return nil
+}
+
+// revive:disable:cyclomatic
+// revive:disable:cognitive-complexity
+
+func loadGlobalConfField(cfg *GlobalConfig, field basic.Field) error {
+	// revive:enable:cyclomatic
+	// revive:enable:cognitive-complexity
+
+	// TODO: refactor when asciigoat's ini parser learns to do reflection
+
+	switch field.Key {
+	case "fsid":
+		if !core.IsZero(cfg.FSID) {
+			return core.Wrap(fs.ErrInvalid, "duplicate field %q", field.Key)
+		}
+
+		err := cfg.FSID.UnmarshalText([]byte(field.Value))
+		switch {
+		case err != nil:
+			return core.Wrap(err, field.Key)
+		default:
+			return nil
+		}
+	case "mon_host":
+		entries, _ := parser.SplitCommaArray(field.Value)
+		for _, s := range entries {
+			var addr netip.Addr
+
+			if err := addr.UnmarshalText([]byte(s)); err != nil {
+				return core.Wrap(err, field.Key)
+			}
+
+			cfg.MonitorsAddr = append(cfg.MonitorsAddr, addr)
+		}
+		return nil
+	case "mon_initial_members":
+		entries, _ := parser.SplitCommaArray(field.Value)
+		cfg.Monitors = append(cfg.Monitors, entries...)
+		return nil
+	case "cluster_network":
+		if !core.IsZero(cfg.ClusterNetwork) {
+			err := core.Wrap(fs.ErrInvalid, "fields before the first section")
+			return err
+		}
+
+		err := cfg.ClusterNetwork.UnmarshalText([]byte(field.Value))
+		switch {
+		case err != nil:
+			return core.Wrap(err, field.Key)
+		default:
+			return nil
+		}
+	}
+	return nil
+}
+
+func newConfigFromDocument(doc *basic.Document) (*Config, error) {
+	var out Config
+
+	if len(doc.Global) > 0 {
+		err := core.Wrap(fs.ErrInvalid, "fields before the first section")
+		return nil, err
+	}
+
+	for i := range doc.Sections {
+		src := &doc.Sections[i]
+		if err := loadConfSection(&out, src); err != nil {
+			return nil, err
+		}
+	}
+
+	return &out, nil
+}

pkg/cluster/ceph.go

@@ -0,0 +1,122 @@
+package cluster
+
+import (
+	"bytes"
+	"net/netip"
+	"sort"
+
+	"darvaza.org/core"
+	"github.com/gofrs/uuid/v5"
+
+	"git.jpi.io/amery/jpictl/pkg/ceph"
+)
+
+// GetCephFSID returns our Ceph's FSID
+func (m *Cluster) GetCephFSID() (uuid.UUID, error) {
+	if core.IsZero(m.CephFSID) {
+		// generate one
+		v, err := uuid.NewV4()
+		if err != nil {
+			return uuid.Nil, err
+		}
+		m.CephFSID = v
+	}
+	return m.CephFSID, nil
+}
+
+// GetCephConfig reads the ceph.conf file
+func (m *Cluster) GetCephConfig() (*ceph.Config, error) {
+	data, err := m.ReadFile("ceph.conf")
+	if err != nil {
+		return nil, err
+	}
+
+	r := bytes.NewReader(data)
+	return ceph.NewConfigFromReader(r)
+}
+
+// WriteCephConfig writes the ceph.conf file
+func (m *Cluster) WriteCephConfig(cfg *ceph.Config) error {
+	f, err := m.CreateTruncFile("ceph.conf")
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	_, err = cfg.WriteTo(f)
+	return err
+}
+
+// GenCephConfig prepares a ceph.Config using the cluster information
+func (m *Cluster) GenCephConfig() (*ceph.Config, error) {
+	fsid, err := m.GetCephFSID()
+	if err != nil {
+		return nil, err
+	}
+
+	cfg := &ceph.Config{
+		Global: ceph.GlobalConfig{
+			FSID: fsid,
+			ClusterNetwork: netip.PrefixFrom(
+				netip.AddrFrom4([4]byte{10, 0, 0, 0}),
+				8,
+			),
+		},
+	}
+
+	m.ForEachZone(func(z *Zone) bool {
+		for _, p := range z.GetCephMonitors() {
+			addr, _ := RingOneAddress(z.ID, p.ID)
+
+			cfg.Global.Monitors = append(cfg.Global.Monitors, p.Name)
+			cfg.Global.MonitorsAddr = append(cfg.Global.MonitorsAddr, addr)
+		}
+		return false
+	})
+
+	return cfg, nil
+}
+
+// GetCephMonitors returns the set of Ceph monitors on
+// the zone
+func (z *Zone) GetCephMonitors() Machines {
+	var mons Machines
+	var first, second *Machine
+
+	z.ForEachMachine(func(p *Machine) bool {
+		switch {
+		case p.CephMonitor:
+			// it is a monitor
+			mons = append(mons, p)
+		case len(mons) > 0:
+			// zone has a monitor
+		case first == nil && !p.IsGateway():
+			// first option for monitor
+			first = p
+		case second == nil:
+			// second option for monitor
+			second = p
+		}
+
+		return false
+	})
+
+	switch {
+	case len(mons) > 0:
+		// ready
+	case first != nil:
+		// make first option our monitor
+		first.CephMonitor = true
+		mons = append(mons, first)
+	case second != nil:
+		// make second option our monitor
+		second.CephMonitor = true
+		mons = append(mons, second)
+	default:
+		// zone without machines??
+		panic("unreachable")
+	}
+
+	sort.Sort(mons)
+	return mons
+}

pkg/cluster/ceph_scan.go

@@ -0,0 +1,107 @@
+package cluster
+
+import (
+	"os"
+
+	"darvaza.org/slog"
+	"git.jpi.io/amery/jpictl/pkg/ceph"
+)
+
+type cephScanTODO struct {
+	names map[string]bool
+	addrs map[string]bool
+}
+
+func (todo *cephScanTODO) checkMachine(p *Machine) bool {
+	// on ceph all addresses are ring1
+	ring1, _ := RingOneAddress(p.Zone(), p.ID)
+	addr := ring1.String()
+
+	if _, found := todo.names[p.Name]; found {
+		// found on the TODO by name
+		todo.names[p.Name] = true
+		todo.addrs[addr] = true
+		return true
+	}
+
+	if _, found := todo.addrs[addr]; found {
+		// found on the TODO by address
+		todo.names[p.Name] = true
+		todo.addrs[addr] = true
+		return true
+	}
+
+	return false
+}
+
+func (todo *cephScanTODO) LogMissing(log slog.Logger) {
+	for name, found := range todo.names {
+		if !found {
+			log.Warn().
+				WithField("subsystem", "ceph").
+				WithField("monitor", name).
+				Print("unknown monitor")
+		}
+	}
+
+	for addr, found := range todo.addrs {
+		if !found {
+			log.Warn().
+				WithField("subsystem", "ceph").
+				WithField("monitor", addr).
+				Print("unknown monitor")
+		}
+	}
+}
+
+func newCephScanTODO(cfg *ceph.Config) *cephScanTODO {
+	todo := &cephScanTODO{
+		names: make(map[string]bool),
+		addrs: make(map[string]bool),
+	}
+
+	for _, name := range cfg.Global.Monitors {
+		todo.names[name] = false
+	}
+
+	for _, addr := range cfg.Global.MonitorsAddr {
+		todo.addrs[addr.String()] = false
+	}
+
+	return todo
+}
+
+func (m *Cluster) scanCephMonitors(opts *ScanOptions) error {
+	cfg, err := m.GetCephConfig()
+	switch {
+	case os.IsNotExist(err):
+		err = nil
+	case err != nil:
+		return err
+	}
+
+	if cfg != nil {
+		// store FSID
+		m.CephFSID = cfg.Global.FSID
+
+		// flag monitors based on config
+		todo := newCephScanTODO(cfg)
+		m.ForEachMachine(func(p *Machine) bool {
+			p.CephMonitor = todo.checkMachine(p)
+			return false
+		})
+
+		todo.LogMissing(m.log)
+	}
+
+	return m.initCephMonitors(opts)
+}
+
+func (m *Cluster) initCephMonitors(_ *ScanOptions) error {
+	// make sure every zone has one
+	m.ForEachZone(func(z *Zone) bool {
+		_ = z.GetCephMonitors()
+		return false
+	})
+	return nil
+}

pkg/cluster/cluster.go

@@ -0,0 +1,78 @@
+// Package cluster contains information about the cluster
+package cluster
+
+import (
+	"io/fs"
+
+	"darvaza.org/resolver"
+	"darvaza.org/slog"
+	"github.com/gofrs/uuid/v5"
+)
+
+var (
+	_ MachineIterator = (*Cluster)(nil)
+	_ ZoneIterator    = (*Cluster)(nil)
+)
+
+// revive:disable:line-length-limit
+
+// Cluster represents all zones in a cluster
+type Cluster struct {
+	dir      fs.FS
+	log      slog.Logger
+	resolver resolver.Resolver
+
+	BaseDir string `json:"dir,omitempty"    yaml:"dir,omitempty"`
+	Name    string `json:"name,omitempty"   yaml:"name,omitempty"`
+	Domain  string `json:"domain,omitempty" yaml:"domain,omitempty"`
+
+	CephFSID uuid.UUID `json:"ceph_fsid,omitempty" yaml:"ceph_fsid,omitempty"`
+	Regions  []Region  `json:",omitempty"          yaml:",omitempty"`
+	Zones    []*Zone   `json:",omitempty"          yaml:",omitempty"`
+}
+
+// revive:enable:line-length-limit
+
+// ForEachMachine calls a function for each Machine in the cluster
+// until instructed to terminate the loop
+func (m *Cluster) ForEachMachine(fn func(*Machine) bool) {
+	m.ForEachZone(func(z *Zone) bool {
+		var term bool
+
+		z.ForEachMachine(func(p *Machine) bool {
+			term = fn(p)
+			return term
+		})
+
+		return term
+	})
+}
+
+// ForEachZone calls a function for each Zone in the cluster
+// until instructed to terminate the loop
+func (m *Cluster) ForEachZone(fn func(*Zone) bool) {
+	for _, p := range m.Zones {
+		if fn(p) {
+			// terminate
+			return
+		}
+	}
+}
+
+// GetMachineByName looks for a machine with the specified
+// name on any zone
+func (m *Cluster) 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
+}

pkg/cluster/cluster_file.go

@@ -0,0 +1,115 @@
+package cluster
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	fs "github.com/hack-pad/hackpadfs"
+)
+
+// OpenFile opens a file on the cluster's config directory with the specified flags
+func (m *Cluster) OpenFile(name string, flags int, args ...any) (fs.File, error) {
+	if len(args) > 0 {
+		name = fmt.Sprintf(name, args...)
+	}
+
+	return fs.OpenFile(m.dir, name, flags, 0644)
+}
+
+// CreateTruncFile creates or truncates a file on the cluster's config directory
+func (m *Cluster) CreateTruncFile(name string, args ...any) (io.WriteCloser, error) {
+	return m.openWriter(name, os.O_CREATE|os.O_TRUNC, args...)
+}
+
+// CreateFile creates a file on the cluster's config directory
+func (m *Cluster) CreateFile(name string, args ...any) (io.WriteCloser, error) {
+	return m.openWriter(name, os.O_CREATE, args...)
+}
+
+func (m *Cluster) openWriter(name string, flags int, args ...any) (io.WriteCloser, error) {
+	f, err := m.OpenFile(name, os.O_WRONLY|flags, args...)
+	if err != nil {
+		return nil, err
+	}
+
+	if f, ok := f.(io.WriteCloser); ok {
+		return f, nil
+	}
+
+	panic("unreachable")
+}
+
+// RemoveFile deletes a file from the cluster's config directory
+func (m *Cluster) RemoveFile(name string, args ...any) error {
+	if len(args) > 0 {
+		name = fmt.Sprintf(name, args...)
+	}
+
+	err := fs.Remove(m.dir, name)
+	switch {
+	case os.IsNotExist(err):
+		return nil
+	default:
+		return err
+	}
+}
+
+// ReadFile reads a file from the cluster's config directory
+func (m *Cluster) ReadFile(name string, args ...any) ([]byte, error) {
+	if len(args) > 0 {
+		name = fmt.Sprintf(name, args...)
+	}
+
+	return fs.ReadFile(m.dir, name)
+}
+
+// ReadLines reads a file from the cluster's config directory,
+// split by lines, trimmed, and accepting `#` to comment lines out.
+func (m *Cluster) ReadLines(name string, args ...any) ([]string, error) {
+	var out []string
+
+	data, err := m.ReadFile(name, args...)
+	if err != nil {
+		return nil, err
+	}
+
+	sc := bufio.NewScanner(bytes.NewReader(data))
+	for sc.Scan() {
+		s := strings.TrimSpace(sc.Text())
+		switch {
+		case s == "", strings.HasPrefix(s, "#"):
+			// ignore
+		default:
+			// accepted
+			out = append(out, s)
+		}
+	}
+
+	return out, nil
+}
+
+// WriteStringFile writes the given content to a file on the machine's config directory
+func (m *Cluster) WriteStringFile(value string, name string, args ...any) error {
+	f, err := m.CreateTruncFile(name, args...)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	buf := bytes.NewBufferString(value)
+	_, err = buf.WriteTo(f)
+	return err
+}
+
+// MkdirAll creates directories relative to the cluster's config directory
+func (m *Cluster) MkdirAll(name string, args ...any) error {
+	if len(args) > 0 {
+		name = fmt.Sprintf(name, args...)
+	}
+
+	return fs.MkdirAll(m.dir, name, 0755)
+}

pkg/cluster/cluster_fs.go

@@ -0,0 +1,25 @@
+package cluster
+
+import (
+	"io/fs"
+	"path/filepath"
+
+	"github.com/hack-pad/hackpadfs/os"
+)
+
+// DirFS returns a file system (an [fs.FS]) for the tree
+// of files rooted at the directory dir.
+func DirFS(dir string) (fs.FS, error) {
+	dir = filepath.Clean(dir)
+	fullPath, err := filepath.Abs(dir)
+	if err != nil {
+		return nil, err
+	}
+
+	sub, err := os.NewFS().Sub(fullPath[1:])
+	if err != nil {
+		return nil, err
+	}
+
+	return sub, nil
+}

pkg/cluster/cluster_import.go

@@ -0,0 +1,139 @@
+package cluster
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+
+	"gopkg.in/yaml.v3"
+)
+
+func (m *Cluster) init(opts *ScanOptions) error {
+	for _, fn := range []func(*ScanOptions) error{
+		m.initZones,
+		m.scanZoneIDs,
+		m.scanSort,
+		m.scanGateways,
+		m.initCephMonitors,
+		m.initRegions,
+	} {
+		if err := fn(opts); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (m *Cluster) initZones(opts *ScanOptions) error {
+	var err error
+
+	sub, err := DirFS(m.BaseDir)
+	if err != nil {
+		return err
+	}
+
+	m.dir = sub
+
+	m.ForEachZone(func(z *Zone) bool {
+		err = m.initZone(z, opts)
+		return err != nil
+	})
+
+	return err
+}
+
+func (m *Cluster) initZone(z *Zone, _ *ScanOptions) error {
+	var hasMissing bool
+	var lastMachineID int
+
+	z.zones = m
+	z.logger = m
+
+	z.ForEachMachine(func(p *Machine) bool {
+		p.zone = z
+		p.logger = z
+
+		switch {
+		case p.ID == 0:
+			hasMissing = true
+		case p.ID > lastMachineID:
+			lastMachineID = z.ID
+		}
+
+		return false
+	})
+
+	if hasMissing {
+		next := lastMachineID + 1
+
+		z.ForEachMachine(func(p *Machine) bool {
+			if p.ID == 0 {
+				p.ID, next = next, next+1
+			}
+
+			return false
+		})
+	}
+
+	z.ForEachMachine(func(p *Machine) bool {
+		p.Name = fmt.Sprintf("%s-%v", z.Name, p.ID)
+		return false
+	})
+
+	return nil
+}
+
+func decodeConfigData(data []byte) (out *Cluster, err error) {
+	// try JSON first
+	out = new(Cluster)
+	err = json.Unmarshal(data, out)
+	if err == nil {
+		// good json
+		return out, nil
+	} else if _, ok := err.(*json.SyntaxError); !ok {
+		// bad json
+		return nil, err
+	}
+
+	out = new(Cluster)
+	err = yaml.Unmarshal(data, out)
+	if err != nil {
+		// bad yaml too
+		return nil, err
+	}
+
+	// good yaml
+	return out, nil
+}
+
+// NewFromConfig loads the cluster data from the given file
+func NewFromConfig(filename string, opts ...ScanOption) (*Cluster, error) {
+	var scanOptions ScanOptions
+
+	data, err := os.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	m, err := decodeConfigData(data)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, opt := range opts {
+		if err = opt(m, &scanOptions); err != nil {
+			return nil, err
+		}
+	}
+
+	if err = m.setScanDefaults(&scanOptions); err != nil {
+		return nil, err
+	}
+
+	if err := m.init(&scanOptions); err != nil {
+		return nil, err
+	}
+
+	return m, nil
+}

pkg/cluster/cluster_scan.go

@@ -0,0 +1,221 @@
+package cluster
+
+import (
+	"io/fs"
+	"sort"
+
+	"darvaza.org/core"
+)
+
+func (m *Cluster) scan(opts *ScanOptions) error {
+	for _, fn := range []func(*ScanOptions) error{
+		m.scanDirectory,
+		m.scanMachines,
+		m.scanZoneIDs,
+		m.scanSort,
+		m.scanGateways,
+		m.scanCephMonitors,
+	} {
+		if err := fn(opts); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (m *Cluster) scanDirectory(_ *ScanOptions) error {
+	// each directory is a zone
+	entries, err := fs.ReadDir(m.dir, ".")
+	if err != nil {
+		return err
+	}
+
+	for _, e := range entries {
+		if e.IsDir() {
+			z, err := m.newZone(e.Name())
+			switch {
+			case err != nil:
+				return core.Wrap(err, e.Name())
+			case z.Machines.Len() == 0:
+				z.warn(nil).
+					WithField("zone", z.Name).
+					Print("empty")
+			default:
+				m.Zones = append(m.Zones, z)
+			}
+		}
+	}
+
+	return nil
+}
+
+func (m *Cluster) newZone(name string) (*Zone, error) {
+	z := &Zone{
+		zones:  m,
+		logger: m,
+		Name:   name,
+	}
+
+	z.debug().
+		WithField("zone", z.Name).
+		Print("found")
+
+	if err := z.scan(); err != nil {
+		return nil, err
+	}
+	return z, nil
+}
+
+func (m *Cluster) scanMachines(opts *ScanOptions) error {
+	var err error
+	m.ForEachMachine(func(p *Machine) bool {
+		err = p.scan(opts)
+		return err != nil
+	})
+	m.ForEachMachine(func(p *Machine) bool {
+		err = p.scanWrapUp(opts)
+		return err != nil
+	})
+	return err
+}
+
+func (m *Cluster) scanZoneIDs(_ *ScanOptions) 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 *Cluster) scanSort(_ *ScanOptions) 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.Sort(z)
+		return false
+	})
+
+	m.ForEachMachine(func(p *Machine) bool {
+		sort.SliceStable(p.Rings, func(i, j int) bool {
+			ri1 := p.Rings[i]
+			ri2 := p.Rings[j]
+
+			return ri1.Ring < ri2.Ring
+		})
+
+		return false
+	})
+
+	return nil
+}
+
+func (m *Cluster) scanGateways(_ *ScanOptions) error {
+	var err error
+
+	m.ForEachZone(func(z *Zone) bool {
+		_, _, err = z.GetGateway()
+		return err != nil
+	})
+	return err
+}
+
+func (z *Zone) scan() error {
+	// each directory is a machine
+	entries, err := fs.ReadDir(z.zones.dir, z.Name)
+	if err != nil {
+		return err
+	}
+
+	for _, e := range entries {
+		if e.IsDir() {
+			m := &Machine{
+				zone:   z,
+				logger: z,
+				Name:   e.Name(),
+			}
+
+			m.debug().
+				WithField("node", m.Name).
+				WithField("zone", z.Name).
+				Print("found")
+
+			if err := m.init(); err != nil {
+				m.error(err).
+					WithField("node", m.Name).
+					WithField("zone", z.Name).
+					Print()
+
+				return err
+			}
+
+			z.Machines = append(z.Machines, m)
+		}
+	}
+
+	return nil
+}
+
+// GetGateway returns the first gateway found, if none
+// files will be created to enable the first [Machine] to
+// be one
+func (z *Zone) GetGateway() (*Machine, bool, error) {
+	var first *Machine
+	var gateway *Machine
+
+	z.zones.ForEachMachine(func(p *Machine) bool {
+		switch {
+		case p.IsGateway():
+			// found
+			gateway = p
+		case first == nil:
+			// remember
+			first = p
+		default:
+			// keep looking
+		}
+
+		return gateway != nil
+	})
+
+	switch {
+	case gateway != nil:
+		// found one
+		return gateway, false, nil
+	case first != nil:
+		// make one
+		if err := first.SetGateway(true); err != nil {
+			return first, false, err
+		}
+		return first, true, nil
+	default:
+		// Zone without nodes?
+		panic("unreachable")
+	}
+}

pkg/cluster/cluster_scan_options.go

@@ -0,0 +1,130 @@
+package cluster
+
+import (
+	"io/fs"
+	"path/filepath"
+
+	"darvaza.org/resolver"
+	"darvaza.org/slog"
+)
+
+// A ScanOption pre-configures the Zones before scanning
+type ScanOption func(*Cluster, *ScanOptions) error
+
+// ScanOptions contains flags used by the initial scan
+type ScanOptions struct {
+	// DontResolvePublicAddresses indicates we shouldn't
+	// pre-populate Machine.PublicAddresses during the
+	// initial scan
+	DontResolvePublicAddresses bool
+
+	// Logger specifies the logger to be used. otherwise
+	// the scanner will be mute
+	slog.Logger
+}
+
+// ResolvePublicAddresses instructs the scanner to use
+// the DNS resolver to get PublicAddresses of nodes.
+// Default is true
+func ResolvePublicAddresses(resolve bool) ScanOption {
+	return func(m *Cluster, opt *ScanOptions) error {
+		opt.DontResolvePublicAddresses = !resolve
+		return nil
+	}
+}
+
+// WithLookuper specifies what resolver.Lookuper to use to
+// find public addresses
+func WithLookuper(h resolver.Lookuper) ScanOption {
+	return func(m *Cluster, opt *ScanOptions) error {
+		if h == nil {
+			return fs.ErrInvalid
+		}
+		m.resolver = resolver.NewResolver(h)
+		return nil
+	}
+}
+
+// WithResolver specifies what resolver to use to find
+// public addresses. if nil is passed, the [net.Resolver] will be used.
+// The default is using Cloudflare's 1.1.1.1.
+func WithResolver(h resolver.Resolver) ScanOption {
+	return func(m *Cluster, opt *ScanOptions) error {
+		if h == nil {
+			h = resolver.SystemResolver(true)
+		}
+
+		m.resolver = h
+		return nil
+	}
+}
+
+// WithLogger specifies what to use for logging
+func WithLogger(log slog.Logger) ScanOption {
+	return func(m *Cluster, opt *ScanOptions) error {
+		if log == nil {
+			log = DefaultLogger()
+		}
+
+		opt.Logger = log
+		m.log = log
+		return nil
+	}
+}
+
+func (m *Cluster) setScanDefaults(opt *ScanOptions) error {
+	if m.resolver == nil {
+		h := DefaultLookuper()
+
+		if err := WithLookuper(h)(m, opt); err != nil {
+			return err
+		}
+	}
+
+	if opt.Logger == nil {
+		if err := WithLogger(nil)(m, opt); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// NewFromDirectory builds a [Cluster] tree using the given directory
+func NewFromDirectory(dir, domain string, opts ...ScanOption) (*Cluster, error) {
+	var scanOptions ScanOptions
+
+	dir = filepath.Clean(dir)
+	fullPath, err := filepath.Abs(dir)
+	if err != nil {
+		return nil, err
+	}
+
+	sub, err := DirFS(dir)
+	if err != nil {
+		return nil, err
+	}
+
+	m := &Cluster{
+		dir:     sub,
+		BaseDir: dir,
+		Name:    filepath.Base(fullPath),
+		Domain:  domain,
+	}
+
+	for _, opt := range opts {
+		if err := opt(m, &scanOptions); err != nil {
+			return nil, err
+		}
+	}
+
+	if err := m.setScanDefaults(&scanOptions); err != nil {
+		return nil, err
+	}
+
+	if err := m.scan(&scanOptions); err != nil {
+		return nil, err
+	}
+
+	return m, nil
+}

pkg/cluster/defaults.go

@@ -0,0 +1,17 @@
+package cluster
+
+import (
+	"darvaza.org/resolver"
+	"darvaza.org/slog"
+	"darvaza.org/slog/handlers/discard"
+)
+
+// DefaultLogger returns a logger that doesn't log anything
+func DefaultLogger() slog.Logger {
+	return discard.New()
+}
+
+// DefaultLookuper returns a [resolver.Lookuper] using Cloudflare's 1.1.1.1
+func DefaultLookuper() resolver.Lookuper {
+	return resolver.NewCloudflareLookuper()
+}

pkg/cluster/env.go

@@ -0,0 +1,177 @@
+package cluster
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"strings"
+)
+
+// Env is a shell environment factory for this cluster
+type Env struct {
+	ZoneIterator
+
+	cephFSID string
+	export   bool
+}
+
+// Env returns a shell environment factory
+func (m *Cluster) Env(export bool) (*Env, error) {
+	fsid, err := m.GetCephFSID()
+	if err != nil {
+		return nil, err
+	}
+
+	env := &Env{
+		ZoneIterator: m,
+		cephFSID:     fsid.String(),
+		export:       export,
+	}
+
+	return env, nil
+}
+
+// Zones returns the list of Zone IDs
+func (m *Env) Zones() []int {
+	var zones []int
+
+	m.ForEachZone(func(z *Zone) bool {
+		zones = append(zones, z.ID)
+		return false
+	})
+
+	return zones
+}
+
+// WriteTo generates environment variables for shell scripts
+func (m *Env) WriteTo(w io.Writer) (int64, error) {
+	var buf bytes.Buffer
+
+	if m.cephFSID != "" {
+		m.writeEnvVar(&buf, m.cephFSID, "FSID")
+	}
+
+	m.writeEnvVarInts(&buf, m.Zones(), "ZONES")
+
+	m.ForEachZone(func(z *Zone) bool {
+		m.writeEnvZone(&buf, z)
+		return false
+	})
+
+	return buf.WriteTo(w)
+}
+
+func (m *Env) writeEnvZone(w io.Writer, z *Zone) {
+	zoneID := z.ID
+
+	// ZONE{zoneID}
+	m.writeEnvVar(w, genEnvZoneNodes(z), "ZONE%v", zoneID)
+
+	// ZONE{zoneID}_NAME
+	m.writeEnvVar(w, z.Name, "ZONE%v_%s", zoneID, "NAME")
+
+	// ZONE{zoneID}_GW
+	gateways, _ := z.GatewayIDs()
+	m.writeEnvVarInts(w, gateways, "ZONE%v_%s", zoneID, "GW")
+
+	// Ceph
+	monitors := z.GetCephMonitors()
+	// MON{zoneID}_NAME
+	m.writeEnvVar(w, genEnvZoneCephMonNames(monitors), "MON%v_%s", zoneID, "NAME")
+	// MON{zoneID}_IP
+	m.writeEnvVar(w, genEnvZoneCephMonIPs(monitors), "MON%v_%s", zoneID, "IP")
+	// MON{zoneID}_ID
+	m.writeEnvVar(w, genEnvZoneCephMonIDs(monitors), "MON%v_%s", zoneID, "ID")
+}
+
+func (m *Env) writeEnvVarInts(w io.Writer, value []int, name string, args ...any) {
+	var s string
+
+	if n := len(value); n > 0 {
+		var buf bytes.Buffer
+
+		for i, v := range value {
+			if i != 0 {
+				_, _ = fmt.Fprint(&buf, " ")
+			}
+			_, _ = fmt.Fprintf(&buf, "%v", v)
+		}
+
+		s = buf.String()
+	}
+
+	m.writeEnvVar(w, s, name, args...)
+}
+
+func (m *Env) writeEnvVar(w io.Writer, value string, name string, args ...any) {
+	var prefix string
+
+	if m.export {
+		prefix = "export "
+	}
+
+	if len(args) > 0 {
+		name = fmt.Sprintf(name, args...)
+	}
+
+	if name != "" {
+		value = strings.TrimSpace(value)
+
+		_, _ = fmt.Fprintf(w, "%s%s=%q\n", prefix, name, value)
+	}
+}
+
+func genEnvZoneNodes(z *Zone) string {
+	if n := z.Len(); n > 0 {
+		s := make([]string, 0, n)
+
+		z.ForEachMachine(func(p *Machine) bool {
+			s = append(s, p.Name)
+			return false
+		})
+
+		return strings.Join(s, " ")
+	}
+	return ""
+}
+
+func genEnvZoneCephMonNames(m Machines) string {
+	var buf strings.Builder
+	m.ForEachMachine(func(p *Machine) bool {
+		if buf.Len() > 0 {
+			_, _ = buf.WriteRune(' ')
+		}
+		_, _ = buf.WriteString(p.Name)
+
+		return false
+	})
+	return buf.String()
+}
+
+func genEnvZoneCephMonIPs(m Machines) string {
+	var buf strings.Builder
+	m.ForEachMachine(func(p *Machine) bool {
+		addr, _ := RingOneAddress(p.Zone(), p.ID)
+
+		if buf.Len() > 0 {
+			_, _ = buf.WriteRune(' ')
+		}
+		_, _ = buf.WriteString(addr.String())
+
+		return false
+	})
+	return buf.String()
+}
+
+func genEnvZoneCephMonIDs(m Machines) string {
+	var buf strings.Builder
+	m.ForEachMachine(func(p *Machine) bool {
+		if buf.Len() > 0 {
+			_, _ = buf.WriteRune(' ')
+		}
+		_, _ = fmt.Fprintf(&buf, "%v", p.ID)
+
+		return false
+	})
+	return buf.String()
+}

pkg/cluster/errors.go

@@ -0,0 +1,16 @@
+package cluster
+
+import "errors"
+
+var (
+	// ErrInvalidName indicates the name isn't valid
+	ErrInvalidName = errors.New("invalid name")
+
+	// ErrUnknownNode indicates there is a reference to a node
+	// we don't have on the tree
+	ErrUnknownNode = errors.New("node does not exist")
+
+	// ErrInvalidNode indicates the nodes can't be used for
+	// the intended purpose
+	ErrInvalidNode = errors.New("invalid node")
+)

pkg/cluster/hosts.go

@@ -0,0 +1,128 @@
+package cluster
+
+import (
+	"bytes"
+	"fmt"
+	"strings"
+	"text/template"
+)
+
+type hostsFile struct {
+	Ring0 []hostsEntry
+	Ring1 []hostsEntry
+}
+
+type hostsEntry struct {
+	Addr  string
+	Names []string
+}
+
+var hostsTemplate = template.Must(template.New("hosts").Funcs(template.FuncMap{
+	"StringsJoin": strings.Join,
+}).Parse(`127.0.0.1 localhost
+
+# The following lines are desirable for IPv6 capable hosts
+::1     ip6-localhost ip6-loopback
+fe00::0 ip6-localnet
+ff00::0 ip6-mcastprefix
+ff02::1 ip6-allnodes
+ff02::2 ip6-allrouters
+ff02::3 ip6-allhosts
+
+{{range .Ring1 -}}
+{{.Addr}}  {{StringsJoin .Names " "}}
+{{end}}
+{{range .Ring0 -}}
+{{.Addr}}  {{StringsJoin .Names " "}}
+{{end -}}
+`))
+
+// WriteHosts rewrites all hosts files on the tree
+func (m *Cluster) WriteHosts() error {
+	var err error
+
+	m.ForEachZone(func(z *Zone) bool {
+		err = z.WriteHosts()
+		return err != nil
+	})
+
+	return err
+}
+
+// WriteHosts rewrites all hosts files in the zone
+func (z *Zone) WriteHosts() error {
+	var err error
+
+	s := z.Hosts()
+	z.ForEachMachine(func(p *Machine) bool {
+		err = p.WriteStringFile(s, "hosts")
+		return err != nil
+	})
+
+	return err
+}
+
+// WriteHosts rewrites the hosts file
+func (p *Machine) WriteHosts() error {
+	s := p.zone.Hosts()
+	return p.WriteStringFile(s, "hosts")
+}
+
+func (z *Zone) genHosts(out *hostsFile, p *Machine) {
+	var names []string
+
+	ip, _ := RingOneAddress(p.zone.ID, p.ID)
+	names = append(names, p.Name)
+
+	if p.CephMonitor {
+		names = append(names, fmt.Sprintf("%s-%s", p.zone.Name, "ceph"))
+		names = append(names, fmt.Sprintf("%s-%s", p.zone.Name, "k3s"))
+
+		if z.ID == p.zone.ID {
+			names = append(names, "ceph")
+			names = append(names, "k3s")
+		}
+	}
+
+	entry := hostsEntry{
+		Addr:  ip.String(),
+		Names: names,
+	}
+
+	out.Ring1 = append(out.Ring1, entry)
+
+	if p.IsGateway() {
+		var s string
+
+		ip, _ = RingZeroAddress(p.zone.ID, p.ID)
+		s = fmt.Sprintf("%s-%v", p.Name, 0)
+
+		entry = hostsEntry{
+			Addr:  ip.String(),
+			Names: []string{s},
+		}
+
+		out.Ring0 = append(out.Ring0, entry)
+	}
+}
+
+// Hosts renders the /etc/hosts to be used on this zone
+func (z *Zone) Hosts() string {
+	var buf bytes.Buffer
+	var out hostsFile
+
+	z.zones.ForEachZone(func(z2 *Zone) bool {
+		z2.ForEachMachine(func(p *Machine) bool {
+			z.genHosts(&out, p)
+
+			return false
+		})
+		return false
+	})
+
+	if err := hostsTemplate.Execute(&buf, &out); err != nil {
+		panic(err)
+	}
+
+	return buf.String()
+}

pkg/cluster/log.go

@@ -0,0 +1,49 @@
+package cluster
+
+import "darvaza.org/slog"
+
+type logger interface {
+	withDebug() (slog.Logger, bool)
+	withInfo() (slog.Logger, bool)
+
+	debug() slog.Logger
+	info() slog.Logger
+	warn(error) slog.Logger
+	error(error) slog.Logger
+}
+
+var (
+	_ logger = (*Cluster)(nil)
+)
+
+func (z *Cluster) withDebug() (slog.Logger, bool) {
+	return z.debug().WithEnabled()
+}
+
+func (z *Cluster) withInfo() (slog.Logger, bool) {
+	return z.debug().WithEnabled()
+}
+
+func (z *Cluster) debug() slog.Logger {
+	return z.log.Debug()
+}
+
+func (z *Cluster) info() slog.Logger {
+	return z.log.Info()
+}
+
+func (z *Cluster) warn(err error) slog.Logger {
+	l := z.log.Warn()
+	if err != nil {
+		l = l.WithField(slog.ErrorFieldName, err)
+	}
+	return l
+}
+
+func (z *Cluster) error(err error) slog.Logger {
+	l := z.log.Error()
+	if err != nil {
+		l = l.WithField(slog.ErrorFieldName, err)
+	}
+	return l
+}

pkg/cluster/machine.go

@@ -0,0 +1,83 @@
+package cluster
+
+import (
+	"net/netip"
+	"strings"
+)
+
+// revive:disable:line-length-limit
+
+// A Machine is a machine on a Zone
+type Machine struct {
+	zone   *Zone
+	logger `json:"-" yaml:"-"`
+
+	ID   int
+	Name string `json:"-" yaml:"-"`
+
+	Inactive        bool         `json:"inactive,omitempty"     yaml:"inactive,omitempty"`
+	CephMonitor     bool         `json:"ceph_monitor,omitempty" yaml:"ceph_monitor,omitempty"`
+	PublicAddresses []netip.Addr `json:"public,omitempty"       yaml:"public,omitempty"`
+	Rings           []*RingInfo  `json:"rings,omitempty"        yaml:"rings,omitempty"`
+}
+
+// revive:enable:line-length-limit
+
+func (m *Machine) String() string {
+	return m.Name
+}
+
+// FullName returns the Name of the machine including domain name
+func (m *Machine) FullName() string {
+	var name []string
+
+	for _, s := range []string{
+		m.Name,
+		m.zone.zones.Name,
+		m.zone.zones.Domain,
+	} {
+		if s != "" {
+			name = append(name, s)
+		}
+	}
+
+	return strings.Join(name, ".")
+}
+
+// IsActive indicates the machine is to be included in regions' DNS entries
+func (m *Machine) IsActive() bool {
+	return !m.Inactive
+}
+
+// IsGateway tells if the Machine is a ring0 gateway
+func (m *Machine) IsGateway() bool {
+	_, ok := m.getRingInfo(0)
+	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.SyncWireguardConfig(0)
+}
+
+// Zone indicates the [Zone] this machine belongs to
+func (m *Machine) Zone() int {
+	return m.zone.ID
+}
+
+func (m *Machine) getPeerByName(name string) (*Machine, bool) {
+	return m.zone.zones.GetMachineByName(name)
+}

pkg/cluster/machine_file.go

@@ -1,7 +1,6 @@
-package zones
+package cluster
 
 import (
-	"bytes"
 	"fmt"
 	"io"
 	"os"
@@ -12,10 +11,9 @@ import (
 
 // OpenFile opens a file on the machine's config directory with the specified flags
 func (m *Machine) OpenFile(name string, flags int, args ...any) (fs.File, error) {
-	base := m.zone.zones.dir
 	fullName := m.getFilename(name, args...)
 
-	return fs.OpenFile(base, fullName, flags, 0644)
+	return m.zone.zones.OpenFile(fullName, flags)
 }
 
 // CreateTruncFile creates or truncates a file on the machine's config directory
@@ -34,42 +32,47 @@ func (m *Machine) openWriter(name string, flags int, args ...any) (io.WriteClose
 		return nil, err
 	}
 
-	return f.(io.WriteCloser), nil
+	if f, ok := f.(io.WriteCloser); ok {
+		return f, nil
+	}
+
+	panic("unreachable")
 }
 
 // RemoveFile deletes a file from the machine's config directory
 func (m *Machine) RemoveFile(name string, args ...any) error {
-	base := m.zone.zones.dir
 	fullName := m.getFilename(name, args...)
-	err := fs.Remove(base, fullName)
 
-	switch {
-	case os.IsNotExist(err):
-		return nil
-	default:
-		return err
-	}
+	return m.zone.zones.RemoveFile(fullName)
 }
 
 // ReadFile reads a file from the machine's config directory
 func (m *Machine) ReadFile(name string, args ...any) ([]byte, error) {
-	base := m.zone.zones.dir
 	fullName := m.getFilename(name, args...)
 
-	return fs.ReadFile(base, fullName)
+	return m.zone.zones.ReadFile(fullName)
+}
+
+// ReadLines reads a file from the machine's config directory,
+// split by lines, trimmed, and accepting `#` to comment lines out.
+func (m *Machine) ReadLines(name string, args ...any) ([]string, error) {
+	fullName := m.getFilename(name, args...)
+
+	return m.zone.zones.ReadLines(fullName)
 }
 
 // WriteStringFile writes the given content to a file on the machine's config directory
 func (m *Machine) WriteStringFile(value string, name string, args ...any) error {
-	f, err := m.CreateTruncFile(name, args...)
-	if err != nil {
-		return err
-	}
-	defer f.Close()
+	fullName := m.getFilename(name, args...)
 
-	buf := bytes.NewBufferString(value)
-	_, err = buf.WriteTo(f)
-	return err
+	return m.zone.zones.WriteStringFile(value, fullName)
+}
+
+// MkdirAll creates directories relative to the machine's config directory
+func (m *Machine) MkdirAll(name string, args ...any) error {
+	fullName := m.getFilename(name, args...)
+
+	return m.zone.zones.MkdirAll(fullName)
 }
 
 func (m *Machine) getFilename(name string, args ...any) string {

pkg/cluster/machine_rings.go

@@ -1,9 +1,9 @@
-package zones
+package cluster
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
-	"io/fs"
 	"os"
 
 	"darvaza.org/core"
@@ -28,7 +28,7 @@ func (m *Machine) GetWireguardKeys(ring int) (wireguard.KeyPair, error) {
 	out.PrivateKey, err = wireguard.PrivateKeyFromBase64(string(data))
 	if err != nil {
 		// bad key
-		err = core.Wrapf(err, "wg%v.key", ring)
+		err = core.Wrap(err, "wg%v.key", ring)
 		return out, err
 	}
 
@@ -44,7 +44,7 @@ func (m *Machine) GetWireguardKeys(ring int) (wireguard.KeyPair, error) {
 		out.PublicKey, err = wireguard.PublicKeyFromBase64(string(data))
 		if err != nil {
 			// bad key
-			err = core.Wrapf(err, "wg%v.pub", ring)
+			err = core.Wrap(err, "wg%v.pub", ring)
 			return out, err
 		}
 	}
@@ -73,38 +73,6 @@ func (m *Machine) tryReadWireguardKeys(ring int) error {
 	}
 }
 
-// WriteWireguardKeys writes the wgN.key/wgN.pub files
-func (m *Machine) WriteWireguardKeys(ring int) error {
-	var err error
-	var key, pub string
-	var ri *RingInfo
-
-	ri, _ = m.getRingInfo(ring)
-	if ri != nil {
-		key = ri.Keys.PrivateKey.String()
-		pub = ri.Keys.PublicKey.String()
-	}
-
-	switch {
-	case key == "":
-		return fs.ErrNotExist
-	case pub == "":
-		pub = ri.Keys.PrivateKey.Public().String()
-	}
-
-	err = m.WriteStringFile(key+"\n", "wg%v.key", ring)
-	if err != nil {
-		return err
-	}
-
-	err = m.WriteStringFile(pub+"\n", "wg%v.pub", ring)
-	if err != nil {
-		return err
-	}
-
-	return nil
-}
-
 // RemoveWireguardKeys deletes wgN.key and wgN.pub from
 // the machine's config directory
 func (m *Machine) RemoveWireguardKeys(ring int) error {
@@ -150,27 +118,44 @@ func (m *Machine) tryApplyWireguardConfig(ring int) error {
 	}
 }
 
-func (m *Machine) applyWireguardConfig(ring int, wg *wireguard.Config) error {
+func (m *Machine) applyWireguardConfigNode(ring int, wg *wireguard.Config) error {
 	addr := wg.GetAddress()
-	zoneID, nodeID, ok := Rings[ring].Decode(addr)
-	if !ok {
-		return fmt.Errorf("%s: invalid wg%v address: %s", m.Name, ring, addr)
-	}
+	if !core.IsZero(addr) {
+		zoneID, nodeID, ok := Rings[ring].Decode(addr)
+		if !ok {
+			return fmt.Errorf("%s: invalid address", addr)
+		}
 
-	if err := m.applyZoneNodeID(zoneID, nodeID); err != nil {
-		err = core.Wrapf(err, "%s: wg%v:%s", m.Name, ring, addr)
-		return err
+		if err := m.applyZoneNodeID(zoneID, nodeID); err != nil {
+			return core.Wrap(err, "%s: invalid address", addr)
+		}
 	}
 
 	if err := m.applyWireguardInterfaceConfig(ring, wg.Interface); err != nil {
-		err = core.Wrapf(err, "%s: wg%v:%s", m.Name, ring, addr)
+		return core.Wrap(err, "interface")
+	}
+
+	return nil
+}
+
+func (m *Machine) applyWireguardConfig(ring int, wg *wireguard.Config) error {
+	if err := m.applyWireguardConfigNode(ring, wg); err != nil {
 		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
+		err := m.applyWireguardPeerConfig(ring, peer)
+		switch {
+		case errors.Is(err, ErrUnknownNode):
+			// ignore unknown peers
+			m.warn(nil).
+				WithField("subsystem", "wireguard").
+				WithField("node", m.Name).
+				WithField("peer", peer.Endpoint.Host).
+				WithField("ring", ring).
+				Print("ignoring unknown endpoint")
+		case err != nil:
+			return core.Wrap(err, "peer")
 		}
 	}
 
@@ -191,6 +176,10 @@ func (m *Machine) applyRingInfo(ring int, new *RingInfo) error {
 	cur, _ := m.getRingInfo(ring)
 	if cur == nil {
 		// first, append
+		m.debug().
+			WithField("node", m.Name).
+			WithField("ring", ring).
+			Print("found")
 		m.Rings = append(m.Rings, new)
 		return nil
 	}
@@ -216,8 +205,10 @@ func (m *Machine) applyWireguardPeerConfig(ring int, pc wireguard.PeerConfig) er
 	switch {
 	case !found:
 		// unknown
+		return core.Wrap(ErrUnknownNode, pc.Endpoint.Host)
 	case ring == 1 && m.zone != peer.zone:
 		// invalid zone
+		return core.Wrap(ErrInvalidNode, peer.Name)
 	default:
 		// apply RingInfo
 		ri := &RingInfo{
@@ -230,8 +221,6 @@ func (m *Machine) applyWireguardPeerConfig(ring int, pc wireguard.PeerConfig) er
 
 		return peer.applyRingInfo(ring, ri)
 	}
-
-	return fmt.Errorf("%q: invalid peer endpoint", pc.Endpoint.Host)
 }
 
 func (m *Machine) applyZoneNodeID(zoneID, nodeID int) error {
@@ -251,6 +240,23 @@ func (m *Machine) applyZoneNodeID(zoneID, nodeID int) error {
 	return nil
 }
 
+func (m *Machine) setRingDefaults(ri *RingInfo) error {
+	if ri.Keys.PrivateKey.IsZero() {
+		m.info().
+			WithField("subsystem", "wireguard").
+			WithField("node", m.Name).
+			WithField("ring", ri.Ring).
+			Print("generating key pair")
+
+		kp, err := wireguard.NewKeyPair()
+		if err != nil {
+			return err
+		}
+		ri.Keys = kp
+	}
+	return nil
+}
+
 // RemoveWireguardConfig deletes wgN.conf from the machine's
 // config directory.
 func (m *Machine) RemoveWireguardConfig(ring int) error {
@@ -261,3 +267,23 @@ func (m *Machine) RemoveWireguardConfig(ring int) error {
 
 	return err
 }
+
+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
+}

pkg/cluster/machine_scan.go

@@ -0,0 +1,129 @@
+package cluster
+
+import (
+	"context"
+	"net/netip"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	"darvaza.org/core"
+)
+
+// LookupNetIP uses the DNS Resolver to get the public addresses associated
+// to a Machine
+func (m *Machine) LookupNetIP(timeout time.Duration) ([]netip.Addr, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+
+	defer cancel()
+
+	return m.zone.zones.resolver.LookupNetIP(ctx, "ip", m.FullName())
+}
+
+// UpdatePublicAddresses uses the DNS Resolver to set Machine.PublicAddresses
+func (m *Machine) UpdatePublicAddresses() error {
+	addrs, err := m.LookupNetIP(2 * time.Second)
+	if err != nil {
+		return err
+	}
+
+	m.PublicAddresses = addrs
+	return nil
+}
+
+func (m *Machine) init() error {
+	if err := m.setID(); err != nil {
+		return core.Wrap(err, m.Name)
+	}
+
+	for i := 0; i < RingsCount; i++ {
+		if err := m.tryReadWireguardKeys(i); err != nil {
+			return core.Wrap(err, m.Name)
+		}
+	}
+
+	return nil
+}
+
+func (m *Machine) setID() error {
+	zoneName := m.zone.Name
+
+	l := len(zoneName)
+	switch {
+	case len(m.Name) < l+2:
+		return ErrInvalidName
+	case !strings.HasPrefix(m.Name, zoneName):
+		return ErrInvalidName
+	case m.Name[l] != '-':
+		return ErrInvalidName
+	}
+
+	suffix := m.Name[l+1:]
+	id, err := strconv.ParseInt(suffix, 10, 8)
+	if err != nil {
+		return err
+	}
+
+	m.ID = int(id)
+	return nil
+}
+
+// scan is called once we know about all zones and machine names
+func (m *Machine) scan(_ *ScanOptions) error {
+	for i := 0; i < RingsCount; i++ {
+		if err := m.tryApplyWireguardConfig(i); err != nil {
+			m.error(err).
+				WithField("subsystem", "wireguard").
+				WithField("node", m.Name).
+				WithField("ring", i).
+				Print()
+			return err
+		}
+	}
+
+	return m.loadInactive()
+}
+
+func (m *Machine) loadInactive() error {
+	data, err := m.ReadLines("region")
+	switch {
+	case os.IsNotExist(err):
+		// no file
+		return nil
+	case err != nil:
+		// read error
+		return err
+	default:
+		// look for "none"
+		for _, r := range data {
+			switch r {
+			case "none":
+				m.Inactive = true
+			default:
+				m.Inactive = false
+			}
+		}
+		return nil
+	}
+}
+
+// scanWrapUp is called once all machines have been scanned
+func (m *Machine) scanWrapUp(opts *ScanOptions) error {
+	for _, ri := range m.Rings {
+		if err := m.setRingDefaults(ri); err != nil {
+			m.error(err).
+				WithField("subsystem", "wireguard").
+				WithField("node", m.Name).
+				WithField("ring", ri.Ring).
+				Print()
+			return err
+		}
+	}
+
+	if !opts.DontResolvePublicAddresses {
+		return m.UpdatePublicAddresses()
+	}
+
+	return nil
+}

pkg/cluster/machines.go

@@ -0,0 +1,69 @@
+package cluster
+
+import "sort"
+
+var (
+	_ MachineIterator = Machines(nil)
+	_ sort.Interface  = Machines(nil)
+)
+
+// A MachineIterator is a set of Machines we can iterate on
+type MachineIterator interface {
+	ForEachMachine(func(*Machine) bool)
+}
+
+// Machines is a list of Machine objects
+type Machines []*Machine
+
+// ForEachMachine calls a function for each Machine in the list
+// until instructed to terminate the loop
+func (m Machines) ForEachMachine(fn func(*Machine) bool) {
+	for _, p := range m {
+		if fn(p) {
+			return
+		}
+	}
+}
+
+// Len returns the number of machines in the list
+func (m Machines) Len() int {
+	return len(m)
+}
+
+// Less implements sort.Interface to sort the list
+func (m Machines) Less(i, j int) bool {
+	a, b := m[i], m[j]
+	za, zb := a.Zone(), b.Zone()
+
+	switch {
+	case za == zb:
+		return a.ID < b.ID
+	default:
+		return za < zb
+	}
+}
+
+// Swap implements sort.Interface to sort the list
+func (m Machines) Swap(i, j int) {
+	m[i], m[j] = m[j], m[i]
+}
+
+// FilterMachines produces a subset of the machines offered by the given
+// iterator fulfilling a condition
+func FilterMachines(m MachineIterator, cond func(*Machine) bool) (Machines, int) {
+	var out []*Machine
+
+	if cond == nil {
+		// unconditional
+		cond = func(*Machine) bool { return true }
+	}
+
+	m.ForEachMachine(func(p *Machine) bool {
+		if cond(p) {
+			out = append(out, p)
+		}
+		return false
+	})
+
+	return out, len(out)
+}

pkg/cluster/regions.go

@@ -0,0 +1,134 @@
+package cluster
+
+var (
+	_ MachineIterator = (*Region)(nil)
+	_ ZoneIterator    = (*Region)(nil)
+)
+
+// Region represents a group of zones geographically related
+type Region struct {
+	m     *Cluster
+	zones []*Zone
+
+	Name    string
+	Regions []string `json:",omitempty" yaml:",omitempty"`
+}
+
+// ForEachRegion calls a function for each Region of the cluster
+// until instructed to terminate the loop
+func (m *Cluster) ForEachRegion(fn func(r *Region) bool) {
+	for i := range m.Regions {
+		r := &m.Regions[i]
+		if fn(r) {
+			return
+		}
+	}
+}
+
+// ForEachMachine calls a function for each Machine in the region
+// until instructed to terminate the loop
+func (r *Region) ForEachMachine(fn func(*Machine) bool) {
+	r.ForEachZone(func(z *Zone) bool {
+		var term bool
+
+		z.ForEachMachine(func(p *Machine) bool {
+			if p.IsActive() {
+				term = fn(p)
+			}
+			return term
+		})
+
+		return term
+	})
+}
+
+// ForEachZone calls a function for each Zone in the region
+// until instructed to terminate the loop
+func (r *Region) ForEachZone(fn func(*Zone) bool) {
+	for _, p := range r.zones {
+		if fn(p) {
+			// terminate
+			return
+		}
+	}
+}
+
+func (m *Cluster) initRegions(_ *ScanOptions) error {
+	regions := make(map[string][]*Zone)
+
+	// first regions defined by zones
+	m.ForEachZone(func(z *Zone) bool {
+		SortRegions(z.Regions)
+		for _, region := range z.Regions {
+			regions[region] = append(regions[region], z)
+		}
+
+		return false
+	})
+
+	// bind first level regions and their zones
+	for name, zones := range regions {
+		m.syncRegions(name, zones...)
+	}
+
+	// and combine zones to produce larger regions
+	for i := range m.Regions {
+		r := &m.Regions[i]
+		m.finishRegion(r)
+	}
+
+	m.sortRegions()
+	return nil
+}
+
+func (m *Cluster) syncRegions(name string, zones ...*Zone) {
+	for _, r := range m.Regions {
+		if r.Name == name {
+			// found
+			r.m = m
+			r.zones = zones
+			return
+		}
+	}
+
+	// new
+	m.Regions = append(m.Regions, Region{
+		m:     m,
+		zones: zones,
+		Name:  name,
+	})
+}
+
+func (m *Cluster) finishRegion(r *Region) {
+	if r.m != nil {
+		// ready
+		return
+	}
+
+	r.m = m
+	sub := []string{}
+	for _, name := range r.Regions {
+		r2, ok := m.getRegion(name)
+		if !ok {
+			m.warn(nil).WithField("region", name).Print("unknown region")
+			continue
+		}
+
+		sub = append(sub, r2.Name)
+		r.zones = append(r.zones, r2.zones...)
+	}
+	r.Regions = sub
+}
+
+func (m *Cluster) getRegion(name string) (*Region, bool) {
+	for i := range m.Regions {
+		r := &m.Regions[i]
+
+		if name == r.Name {
+			m.finishRegion(r)
+			return r, true
+		}
+	}
+
+	return nil, false
+}

pkg/cluster/regions_utils.go

@@ -0,0 +1,41 @@
+package cluster
+
+import "sort"
+
+// SortRegions sorts regions. first by length those 3-character
+// or shorter, and then by length. It's mostly aimed at
+// supporting ISO-3166 order
+func SortRegions(regions []string) []string {
+	sort.Slice(regions, func(i, j int) bool {
+		r1, r2 := regions[i], regions[j]
+		return regionLess(r1, r2)
+	})
+
+	return regions
+}
+
+func regionLess(r1, r2 string) bool {
+	switch {
+	case len(r1) < 4:
+		switch {
+		case len(r1) < len(r2):
+			return true
+		case len(r1) > len(r2):
+			return false
+		default:
+			return r1 < r2
+		}
+	case len(r2) < 4:
+		return false
+	default:
+		return r1 < r2
+	}
+}
+
+func (m *Cluster) sortRegions() {
+	sort.Slice(m.Regions, func(i, j int) bool {
+		r1 := m.Regions[i].Name
+		r2 := m.Regions[j].Name
+		return regionLess(r1, r2)
+	})
+}

pkg/cluster/rings.go

@@ -1,4 +1,4 @@
-package zones
+package cluster
 
 import (
 	"fmt"
@@ -24,9 +24,9 @@ const (
 // RingInfo contains represents the Wireguard endpoint details
 // for a Machine on a particular ring
 type RingInfo struct {
-	Ring    int               `toml:"ring"`
-	Enabled bool              `toml:"enabled,omitempty"`
-	Keys    wireguard.KeyPair `toml:"keys,omitempty"`
+	Ring    int
+	Enabled bool
+	Keys    wireguard.KeyPair
 }
 
 // Merge attempts to combine two RingInfo structs
@@ -41,7 +41,7 @@ func (ri *RingInfo) Merge(alter *RingInfo) error {
 		// can't disable via Merge
 		return fmt.Errorf("invalid %s: %v → %v", "enabled", ri.Enabled, alter.Enabled)
 	case !canMergeKeyPairs(ri.Keys, alter.Keys):
-		// incompatible keypairs
+		// incompatible key pairs
 		return fmt.Errorf("invalid %s: %s ≠ %s", "keys", ri.Keys, alter.Keys)
 	}
 
@@ -210,6 +210,7 @@ func (r *Ring) AddPeer(p *Machine) bool {
 		Address:    addr,
 		PrivateKey: ri.Keys.PrivateKey,
 		PeerConfig: wireguard.PeerConfig{
+			Name:      fmt.Sprintf("%s-%v", p.Name, r.ID),
 			PublicKey: ri.Keys.PublicKey,
 			Endpoint: wireguard.EndpointAddress{
 				Host: p.FullName(),
@@ -300,6 +301,7 @@ func (r *Ring) ExportConfig(p *Machine) (*wireguard.Config, error) {
 		case pp.Node == p:
 			// current
 			found = true
+			out.Interface.Name = pp.PeerConfig.Name
 			out.Interface.Address = pp.Address
 			out.Interface.PrivateKey = pp.PrivateKey
 		default:

pkg/cluster/sync.go

@@ -0,0 +1,60 @@
+package cluster
+
+// SyncAll updates all config files
+func (m *Cluster) SyncAll() error {
+	for _, fn := range []func() error{
+		m.SyncMkdirAll,
+		m.SyncAllWireguard,
+		m.SyncAllCeph,
+		m.WriteHosts,
+	} {
+		if err := fn(); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// SyncMkdirAll creates the directories needed to store files
+// required to represent the cluster.
+func (m *Cluster) SyncMkdirAll() error {
+	err := m.MkdirAll(".")
+	if err == nil {
+		m.ForEachMachine(func(p *Machine) bool {
+			err = p.MkdirAll(".")
+			return err != nil
+		})
+	}
+
+	return err
+}
+
+// SyncAllWireguard updates all wireguard config files
+func (m *Cluster) SyncAllWireguard() error {
+	var err error
+
+	for ring := 0; ring < RingsCount; ring++ {
+		err = m.WriteWireguardKeys(ring)
+		if err != nil {
+			return err
+		}
+
+		err = m.SyncWireguardConfig(ring)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// SyncAllCeph updates the ceph.conf file
+func (m *Cluster) SyncAllCeph() error {
+	cfg, err := m.GenCephConfig()
+	if err != nil {
+		return err
+	}
+
+	return m.WriteCephConfig(cfg)
+}

pkg/cluster/wireguard.go

@@ -0,0 +1,272 @@
+package cluster
+
+import (
+	"io/fs"
+	"os"
+)
+
+var (
+	_ WireguardConfigPruner = (*Cluster)(nil)
+	_ WireguardConfigPruner = (*Zone)(nil)
+	_ WireguardConfigPruner = (*Machine)(nil)
+
+	_ WireguardConfigWriter = (*Cluster)(nil)
+	_ WireguardConfigWriter = (*Zone)(nil)
+	_ WireguardConfigWriter = (*Machine)(nil)
+
+	_ WireguardConfigSyncer = (*Cluster)(nil)
+	_ WireguardConfigSyncer = (*Zone)(nil)
+	_ WireguardConfigSyncer = (*Machine)(nil)
+
+	_ WireguardKeysWriter = (*Cluster)(nil)
+	_ WireguardKeysWriter = (*Zone)(nil)
+	_ WireguardKeysWriter = (*Machine)(nil)
+)
+
+// A WireguardConfigPruner deletes wgN.conf on all machines under
+// its scope with the specified ring disabled
+type WireguardConfigPruner interface {
+	PruneWireguardConfig(ring int) error
+}
+
+// PruneWireguardConfig removes wgN.conf files of machines with
+// the corresponding ring disabled on all zones
+func (m *Cluster) PruneWireguardConfig(ring int) error {
+	return pruneWireguardConfig(m, ring)
+}
+
+// PruneWireguardConfig removes wgN.conf files of machines with
+// the corresponding ring disabled.
+func (z *Zone) PruneWireguardConfig(ring int) error {
+	return pruneWireguardConfig(z, ring)
+}
+
+func pruneWireguardConfig(m MachineIterator, ring int) error {
+	var err error
+
+	m.ForEachMachine(func(p *Machine) bool {
+		err = p.PruneWireguardConfig(ring)
+		if os.IsNotExist(err) {
+			// ignore
+			err = nil
+		}
+
+		return err != nil
+	})
+
+	return err
+}
+
+// PruneWireguardConfig deletes the wgN.conf file if its
+// presence on the ring is disabled
+func (m *Machine) PruneWireguardConfig(ring int) error {
+	_, ok := m.getRingInfo(ring)
+	if !ok {
+		return m.RemoveWireguardConfig(ring)
+	}
+
+	return nil
+}
+
+// A WireguardConfigWriter rewrites all wgN.conf on all machines under
+// its scope attached to that ring
+type WireguardConfigWriter interface {
+	WriteWireguardConfig(ring int) error
+}
+
+// WriteWireguardConfig rewrites all wgN.conf on all machines
+// attached to that ring
+func (m *Cluster) WriteWireguardConfig(ring int) error {
+	switch ring {
+	case 0:
+		return writeWireguardConfig(m, m, ring)
+	case 1:
+		var err error
+		m.ForEachZone(func(z *Zone) bool {
+			err = writeWireguardConfig(m, z, ring)
+			return err != nil
+		})
+		return err
+	default:
+		return fs.ErrInvalid
+	}
+}
+
+// WriteWireguardConfig rewrites all wgN.conf on all machines
+// on the Zone attached to that ring
+func (z *Zone) WriteWireguardConfig(ring int) error {
+	switch ring {
+	case 0:
+		return writeWireguardConfig(z.zones, z.zones, ring)
+	case 1:
+		return writeWireguardConfig(z.zones, z, ring)
+	default:
+		return fs.ErrInvalid
+	}
+}
+
+func writeWireguardConfig(z ZoneIterator, m MachineIterator, ring int) error {
+	r, err := NewRing(z, m, ring)
+	if err != nil {
+		return err
+	}
+
+	r.ForEachMachine(func(p *Machine) bool {
+		err = p.writeWireguardRingConfig(r)
+		return err != nil
+	})
+
+	return err
+}
+
+// WriteWireguardConfig rewrites the wgN.conf file of this Machine
+// if enabled
+func (m *Machine) WriteWireguardConfig(ring int) error {
+	r, err := NewRing(m.zone.zones, m.zone, ring)
+	if err != nil {
+		return err
+	}
+
+	return m.writeWireguardRingConfig(r)
+}
+
+func (m *Machine) writeWireguardRingConfig(r *Ring) error {
+	wg, err := r.ExportConfig(m)
+	if err != nil {
+		return nil
+	}
+
+	f, err := m.CreateTruncFile("wg%v.conf", r.ID)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	_, err = wg.WriteTo(f)
+	return err
+}
+
+// A WireguardConfigSyncer updates all wgN.conf on all machines under
+// its scope reflecting the state of the ring
+type WireguardConfigSyncer interface {
+	SyncWireguardConfig(ring int) error
+}
+
+// SyncWireguardConfig updates all wgN.conf files for the specified
+// ring
+func (m *Cluster) SyncWireguardConfig(ring int) error {
+	switch ring {
+	case 0:
+		return syncWireguardConfig(m, m, ring)
+	case 1:
+		var err error
+		m.ForEachZone(func(z *Zone) bool {
+			err = syncWireguardConfig(m, z, ring)
+			return err != nil
+		})
+		return err
+	default:
+		return fs.ErrInvalid
+	}
+}
+
+// SyncWireguardConfig updates all wgN.conf files for the specified
+// ring
+func (z *Zone) SyncWireguardConfig(ring int) error {
+	switch ring {
+	case 0:
+		return syncWireguardConfig(z.zones, z.zones, ring)
+	case 1:
+		return syncWireguardConfig(z.zones, z, ring)
+	default:
+		return fs.ErrInvalid
+	}
+}
+
+func syncWireguardConfig(z ZoneIterator, m MachineIterator, ring int) error {
+	r, err := NewRing(z, m, ring)
+	if err != nil {
+		return err
+	}
+
+	r.ForEachMachine(func(p *Machine) bool {
+		if _, ok := p.getRingInfo(ring); ok {
+			err = p.writeWireguardRingConfig(r)
+		} else {
+			err = p.RemoveWireguardConfig(ring)
+		}
+		return err != nil
+	})
+
+	return err
+}
+
+// SyncWireguardConfig updates all wgN.conf files for the specified
+// ring
+func (m *Machine) SyncWireguardConfig(ring int) error {
+	return m.zone.SyncWireguardConfig(ring)
+}
+
+// A WireguardKeysWriter writes the Wireguard Keys for all machines
+// under its scope for the specified ring
+type WireguardKeysWriter interface {
+	WriteWireguardKeys(ring int) error
+}
+
+// WriteWireguardKeys rewrites all wgN.{key,pub} files
+func (m *Cluster) WriteWireguardKeys(ring int) error {
+	return writeWireguardKeys(m, ring)
+}
+
+// WriteWireguardKeys rewrites all wgN.{key,pub} files on this zone
+func (z *Zone) WriteWireguardKeys(ring int) error {
+	return writeWireguardKeys(z, ring)
+}
+
+func writeWireguardKeys(m MachineIterator, ring int) error {
+	var err error
+
+	m.ForEachMachine(func(p *Machine) bool {
+		err = p.WriteWireguardKeys(ring)
+		if os.IsNotExist(err) {
+			// ignore
+			err = nil
+		}
+
+		return err != nil
+	})
+
+	return err
+}
+
+// WriteWireguardKeys writes the wgN.key/wgN.pub files
+func (m *Machine) WriteWireguardKeys(ring int) error {
+	var err error
+	var key, pub string
+	var ri *RingInfo
+
+	ri, _ = m.getRingInfo(ring)
+	if ri != nil {
+		key = ri.Keys.PrivateKey.String()
+		pub = ri.Keys.PublicKey.String()
+	}
+
+	switch {
+	case key == "":
+		return fs.ErrNotExist
+	case pub == "":
+		pub = ri.Keys.PrivateKey.Public().String()
+	}
+
+	err = m.WriteStringFile(key+"\n", "wg%v.key", ring)
+	if err != nil {
+		return err
+	}
+
+	err = m.WriteStringFile(pub+"\n", "wg%v.pub", ring)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

pkg/cluster/zones.go

@@ -0,0 +1,69 @@
+package cluster
+
+import (
+	"io/fs"
+)
+
+var (
+	_ MachineIterator = (*Zone)(nil)
+)
+
+// A ZoneIterator is a set of Zones we can iterate on
+type ZoneIterator interface {
+	ForEachZone(func(*Zone) bool)
+}
+
+// A Zone is a set of machines in close proximity and strong
+// affinity.
+type Zone struct {
+	zones  *Cluster
+	logger `json:"-" yaml:"-"`
+
+	ID      int
+	Name    string
+	Regions []string `json:",omitempty" yaml:",omitempty"`
+
+	Machines
+}
+
+func (z *Zone) String() string {
+	return z.Name
+}
+
+// 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
+	}
+}
+
+// GatewayIDs returns the list of IDs of machines that act as ring0 gateways
+func (z *Zone) GatewayIDs() ([]int, int) {
+	var out []int
+	z.ForEachMachine(func(p *Machine) bool {
+		if p.IsGateway() {
+			out = append(out, p.ID)
+		}
+		return false
+	})
+
+	return out, len(out)
+}

pkg/dns/add.go

@@ -0,0 +1,69 @@
+package dns
+
+import (
+	"context"
+	"net/netip"
+	"os"
+	"time"
+
+	"darvaza.org/core"
+	"github.com/libdns/libdns"
+)
+
+// Add adds a machine to the DNS records
+func (mgr *Manager) Add(ctx context.Context, name string, addrs ...netip.Addr) error {
+	// TODO: validate name
+
+	cur, err := mgr.GetRecords(ctx, name)
+	if err != nil {
+		return core.Wrap(err, "GetRecords")
+	}
+
+	// merge []SyncAddr for name
+	s := mgr.asSyncRecordsMap(cur)[name+mgr.suffix]
+	for _, addr := range addrs {
+		s = AppendSyncAddr(s, addr)
+	}
+
+	return mgr.addSyncAddr(ctx, name, s)
+}
+
+func (mgr *Manager) addSyncAddr(ctx context.Context, name string, s []SyncAddr) error {
+	var recs []libdns.Record
+
+	for _, a := range s {
+		recs = append(recs, libdns.Record{
+			ID:    a.ID,
+			Name:  name + mgr.suffix,
+			Type:  core.IIf(a.Addr.Is6(), "AAAA", "A"),
+			TTL:   time.Second,
+			Value: a.Addr.String(),
+		})
+	}
+
+	SortRecords(recs)
+	err := writeRecords(recs, os.Stdout)
+	if err != nil {
+		return err
+	}
+
+	_, err = mgr.p.SetRecords(ctx, mgr.domain, recs)
+	return err
+}
+
+// AppendSyncAddr appends a [netip.Addr] to a [SyncAddr] slice
+// if the address is new.
+func AppendSyncAddr(s []SyncAddr, addr netip.Addr) []SyncAddr {
+	for _, se := range s {
+		if se.Addr.Compare(addr) == 0 {
+			// found
+			return s
+		}
+	}
+
+	s = append(s, SyncAddr{
+		Addr: addr,
+		TTL:  time.Second,
+	})
+	return s
+}

pkg/dns/dns.go

@@ -0,0 +1,38 @@
+// Package dns manages DNS entries for the cluster
+package dns
+
+import (
+	"fmt"
+	"net/netip"
+)
+
+// Zone represents a set of hosts with high affinity
+type Zone struct {
+	Name string
+
+	Hosts map[int]*Host
+}
+
+func (z *Zone) String() string {
+	if z == nil {
+		return "undetermined"
+	}
+	return z.Name
+}
+
+// Host represents a member of the cluster
+type Host struct {
+	zone *Zone
+
+	ID     int
+	Active bool
+	Addrs  []netip.Addr
+}
+
+func (p *Host) String() string {
+	if p == nil {
+		return "undetermined"
+	}
+
+	return fmt.Sprintf("%s-%v", p.zone, p.ID)
+}

pkg/dns/error.go

@@ -0,0 +1,12 @@
+package dns
+
+import "errors"
+
+var (
+	// ErrNoDNSProvider indicates a [libdns.Provider] wasn't assigned
+	// to the [Manager]
+	ErrNoDNSProvider = errors.New("dns provider not specified")
+
+	// ErrNoDomain indicates a domain wasn't specified
+	ErrNoDomain = errors.New("domain not specified")
+)

pkg/dns/manager.go

@@ -0,0 +1,230 @@
+package dns
+
+import (
+	"context"
+	"io/fs"
+	"net/netip"
+	"strings"
+
+	"darvaza.org/core"
+	"darvaza.org/slog"
+	"github.com/libdns/libdns"
+	"golang.org/x/net/publicsuffix"
+
+	"git.jpi.io/amery/jpictl/pkg/cluster"
+)
+
+// Manager is a DNS Manager instance
+type Manager struct {
+	domain  string
+	suffix  string
+	zones   map[string]*Zone
+	regions map[string][]string
+
+	p Provider
+	l slog.Logger
+}
+
+// ManagerOption configures a Manager
+type ManagerOption func(*Manager) error
+
+func newErrorManagerOption(err error, hint string) ManagerOption {
+	return func(*Manager) error {
+		return core.Wrap(err, hint)
+	}
+}
+
+// WithProvider attaches a libdns Provider to the Manager
+func WithProvider(p Provider) ManagerOption {
+	var err error
+
+	if p == nil {
+		p, err = DefaultDNSProvider()
+	}
+
+	if err != nil {
+		return newErrorManagerOption(err, "WithProvider")
+	}
+
+	return func(mgr *Manager) error {
+		mgr.p = p
+		return nil
+	}
+}
+
+// WithLogger attaches a logger to the Manager
+func WithLogger(log slog.Logger) ManagerOption {
+	if log == nil {
+		log = cluster.DefaultLogger()
+	}
+
+	return func(mgr *Manager) error {
+		mgr.l = log
+		return nil
+	}
+}
+
+func (mgr *Manager) setDefaults() error {
+	var opts []ManagerOption
+
+	if mgr.l == nil {
+		opts = append(opts, WithLogger(nil))
+	}
+
+	if mgr.domain == "" || mgr.suffix == "" {
+		return ErrNoDomain
+	}
+
+	for _, opt := range opts {
+		if err := opt(mgr); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// WithDomain specifies where the manager operates
+func WithDomain(domain string) ManagerOption {
+	base, err := publicsuffix.EffectiveTLDPlusOne(domain)
+	if err != nil {
+		return newErrorManagerOption(err, "publicsuffix")
+	}
+
+	suffix := strings.TrimSuffix(domain, base)
+	if suffix != "" {
+		suffix = "." + suffix[:len(suffix)-1]
+	}
+
+	return func(mgr *Manager) error {
+		mgr.domain = base
+		mgr.suffix = suffix
+		return nil
+	}
+}
+
+// NewManager creates a DNS manager with the
+func NewManager(opts ...ManagerOption) (*Manager, error) {
+	mgr := &Manager{
+		zones:   make(map[string]*Zone),
+		regions: make(map[string][]string),
+	}
+
+	for _, opt := range opts {
+		if err := opt(mgr); err != nil {
+			return nil, err
+		}
+	}
+
+	if err := mgr.setDefaults(); err != nil {
+		return nil, err
+	}
+	return mgr, nil
+}
+
+// GetRecords pulls all the address records on DNS for our domain,
+// optionally only those matching the given names.
+func (mgr *Manager) GetRecords(ctx context.Context, names ...string) ([]libdns.Record, error) {
+	if mgr.p == nil {
+		return nil, ErrNoDNSProvider
+	}
+
+	recs, err := mgr.p.GetRecords(ctx, mgr.domain)
+	switch {
+	case err != nil:
+		// failed
+		return nil, err
+	case len(recs) == 0:
+		// empty
+		return []libdns.Record{}, nil
+	case mgr.suffix == "" && len(names) == 0:
+		// unfiltered
+		return recs, nil
+	default:
+		// filtered
+		recs = mgr.filterRecords(recs, names...)
+		return recs, nil
+	}
+}
+
+func (mgr *Manager) filterRecords(recs []libdns.Record, names ...string) []libdns.Record {
+	out := make([]libdns.Record, 0, len(recs))
+	for _, rr := range recs {
+		name, ok := mgr.matchSuffix(rr)
+		switch {
+		case !ok:
+			// skip, wrong subdomain
+			continue
+		case len(names) == 0:
+			// unfiltered, take it
+		case !core.SliceContains(names, name):
+			// skip, not one of the requested names
+			continue
+		}
+
+		out = append(out, rr)
+	}
+
+	return out
+}
+
+func (mgr *Manager) matchSuffix(rr libdns.Record) (string, bool) {
+	if mgr.suffix == "" {
+		// no suffix
+		return rr.Name, true
+	}
+
+	// remove suffix
+	return strings.CutSuffix(rr.Name, mgr.suffix)
+}
+
+// AddHost registers a host
+func (mgr *Manager) AddHost(_ context.Context, zone string, id int,
+	active bool, addrs ...netip.Addr) error {
+	//
+	if zone == "" || id <= 0 {
+		return fs.ErrInvalid
+	}
+
+	z, ok := mgr.zones[zone]
+	if !ok {
+		z = &Zone{
+			Name:  zone,
+			Hosts: make(map[int]*Host),
+		}
+
+		mgr.zones[zone] = z
+	}
+
+	p := &Host{
+		zone:   z,
+		ID:     id,
+		Active: active,
+		Addrs:  SortAddrSlice(addrs),
+	}
+	z.Hosts[id] = p
+
+	if log, ok := mgr.l.Debug().WithEnabled(); ok {
+		log.WithField("subsystem", "dns").
+			WithField("zone", zone).
+			WithField("host", p.String()).
+			WithField("active", active).
+			Print()
+	}
+
+	return nil
+}
+
+// AddRegion specifies a new region and the zones it contains
+func (mgr *Manager) AddRegion(_ context.Context, region string, zones ...string) error {
+	mgr.regions[region] = append(mgr.regions[region], zones...)
+
+	if log, ok := mgr.l.Debug().WithEnabled(); ok {
+		for _, zoneName := range zones {
+			log.WithField("subsystem", "dns").
+				WithField("region", region).
+				WithField("zone", zoneName).Print()
+		}
+	}
+
+	return nil
+}

pkg/dns/provider.go

@@ -0,0 +1,38 @@
+package dns
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/libdns/cloudflare"
+	"github.com/libdns/libdns"
+)
+
+const (
+	// CloudflareAPIToken is the environment variable
+	// containing the API Token
+	CloudflareAPIToken = "CLOUDFLARE_DNS_API_TOKEN"
+)
+
+// Provider manages DNS entries
+type Provider interface {
+	libdns.RecordGetter
+	libdns.RecordDeleter
+	libdns.RecordSetter
+	libdns.RecordAppender
+}
+
+// DefaultDNSProvider returns a cloudflare DNS provider
+// using an API Token from env [CloudflareAPIToken]
+func DefaultDNSProvider() (*cloudflare.Provider, error) {
+	s := os.Getenv(CloudflareAPIToken)
+	if s == "" {
+		return nil, fmt.Errorf("%q: %s", CloudflareAPIToken, "not found")
+	}
+
+	p := &cloudflare.Provider{
+		APIToken: s,
+	}
+
+	return p, nil
+}

pkg/dns/record.go

@@ -0,0 +1,247 @@
+package dns
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"net/netip"
+	"sort"
+	"strings"
+	"time"
+
+	"darvaza.org/core"
+	"github.com/libdns/libdns"
+
+	"git.jpi.io/amery/jpictl/pkg/cluster"
+)
+
+func (mgr *Manager) fqdn(name string) string {
+	return fmt.Sprintf("%s.%s.", name, mgr.domain)
+}
+
+// SortAddrSlice sorts a slice of [netip.Addr]
+func SortAddrSlice(s []netip.Addr) []netip.Addr {
+	sort.Slice(s, func(i, j int) bool {
+		return s[i].Less(s[j])
+	})
+	return s
+}
+
+// SortAddrRecords sorts a slice of [AddrRecord]
+// by Name and Address
+func SortAddrRecords(s []AddrRecord) []AddrRecord {
+	sort.Slice(s, func(i, j int) bool {
+		return s[i].Name < s[j].Name
+	})
+
+	for _, p := range s {
+		SortAddrSlice(p.Addr)
+	}
+
+	return s
+}
+
+// SortRecords sorts a slice of [libdns.Record], by Name, Type and Value
+func SortRecords(s []libdns.Record) []libdns.Record {
+	sort.Slice(s, func(i, j int) bool {
+		return lessRecord(s[i], s[j])
+	})
+	return s
+}
+
+func lessRecord(a, b libdns.Record) bool {
+	aName := strings.ToLower(a.Name)
+	bName := strings.ToLower(b.Name)
+
+	switch {
+	case aName < bName:
+		return true
+	case aName > bName:
+		return false
+	}
+
+	aType := strings.ToUpper(a.Type)
+	bType := strings.ToUpper(b.Type)
+
+	switch {
+	case aType < bType:
+		return true
+	case aType > bType:
+		return false
+	case aType == "A", aType == "AAAA":
+		// IP Addresses
+		var aa, ba netip.Addr
+
+		switch {
+		case aa.UnmarshalText([]byte(a.Value)) != nil:
+			// bad address on a
+			return true
+		case ba.UnmarshalText([]byte(b.Value)) != nil:
+			// bad address on b
+			return false
+		default:
+			return aa.Less(ba)
+		}
+	default:
+		// text
+		return a.Value < b.Value
+	}
+}
+
+// AddrRecord represents an A or AAAA record
+type AddrRecord struct {
+	Name string
+	Addr []netip.Addr
+}
+
+// Sort sorts the addresses of the record
+func (rr *AddrRecord) Sort() {
+	SortAddrSlice(rr.Addr)
+}
+
+// Export converts the record into libdns.Record
+func (rr *AddrRecord) Export() []libdns.Record {
+	out := make([]libdns.Record, len(rr.Addr))
+	for i, addr := range rr.Addr {
+		out[i] = libdns.Record{
+			Name:  rr.Name,
+			TTL:   time.Second * 1,
+			Type:  core.IIf(addr.Is6(), "AAAA", "A"),
+			Value: addr.String(),
+		}
+	}
+
+	return out
+}
+
+// WriteTo writes the record in BIND notation
+func (rr *AddrRecord) WriteTo(w io.Writer) (int64, error) {
+	var total int
+	for _, addr := range rr.Addr {
+		n, err := fmt.Fprint(w,
+			rr.Name, "\t",
+			1, "\t",
+			core.IIf(addr.Is6(), "AAAA", "A"), "\t",
+			addr.String(), "\n")
+
+		switch {
+		case err != nil:
+			return 0, err
+		case n > 0:
+			total += n
+		}
+	}
+
+	return int64(total), nil
+}
+
+// String converts the record into BIND entries
+func (rr *AddrRecord) String() string {
+	var buf bytes.Buffer
+	_, _ = rr.WriteTo(&buf)
+	return buf.String()
+}
+
+func (mgr *Manager) genRegionsSorted() []string {
+	regions := make([]string, 0, len(mgr.regions))
+	for name := range mgr.regions {
+		regions = append(regions, name)
+	}
+
+	return cluster.SortRegions(regions)
+}
+
+func (mgr *Manager) genZonesSorted() []string {
+	zones := make([]string, 0, len(mgr.zones))
+	for name := range mgr.zones {
+		zones = append(zones, name)
+	}
+
+	sort.Strings(zones)
+	return zones
+}
+
+func (mgr *Manager) genAllAddrRecords() []AddrRecord {
+	var out []AddrRecord
+
+	cache := make(map[string][]netip.Addr)
+
+	// zones
+	for _, z := range mgr.zones {
+		// hosts
+		s := mgr.genZoneHostRecords(z)
+		out = append(out, s...)
+
+		// zone alias
+		addrs := mgr.genZoneAddresses(z)
+		name := z.Name
+
+		out = append(out, AddrRecord{
+			Name: name + mgr.suffix,
+			Addr: addrs,
+		})
+
+		// and cache for regions
+		cache[name] = addrs
+	}
+
+	for _, name := range mgr.genRegionsSorted() {
+		var addrs []netip.Addr
+
+		for _, z := range mgr.regions[name] {
+			addrs = append(addrs, cache[z]...)
+		}
+
+		rec := AddrRecord{
+			Name: name + mgr.suffix,
+			Addr: addrs,
+		}
+		rec.Sort()
+
+		out = append(out, rec)
+	}
+
+	SortAddrRecords(out)
+	return out
+}
+
+func (*Manager) genZoneAddresses(z *Zone) []netip.Addr {
+	var out []netip.Addr
+
+	for _, p := range z.Hosts {
+		if p.Active {
+			out = append(out, p.Addrs...)
+		}
+	}
+
+	SortAddrSlice(out)
+	return out
+}
+
+func (mgr *Manager) genZoneHostRecords(z *Zone) []AddrRecord {
+	out := make([]AddrRecord, 0, len(z.Hosts))
+
+	for _, p := range z.Hosts {
+		rec := AddrRecord{
+			Name: p.String() + mgr.suffix,
+			Addr: p.Addrs,
+		}
+		out = append(out, rec)
+	}
+
+	SortAddrRecords(out)
+	return out
+}
+
+func (mgr *Manager) genRegionAddressesCached(name string,
+	zones map[string][]netip.Addr) []netip.Addr {
+	//
+	var addrs []netip.Addr
+
+	for _, zoneName := range mgr.regions[name] {
+		addrs = append(addrs, zones[zoneName]...)
+	}
+
+	SortAddrSlice(addrs)
+	return addrs
+}

pkg/dns/show.go

@@ -0,0 +1,58 @@
+package dns
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"time"
+
+	"darvaza.org/core"
+	"github.com/libdns/libdns"
+)
+
+// Show shows current DNS entries
+func (mgr *Manager) Show(ctx context.Context, names ...string) error {
+	recs, err := mgr.GetRecords(ctx, names...)
+	if err != nil {
+		return core.Wrap(err, "GetRecords")
+	}
+
+	SortRecords(recs)
+	return writeRecords(recs, os.Stdout)
+}
+
+func writeRecords(recs []libdns.Record, w io.Writer) error {
+	var buf bytes.Buffer
+
+	for _, rr := range recs {
+		_ = fmtRecord(&buf, rr)
+		_, _ = buf.WriteRune('\n')
+	}
+	_, _ = fmt.Fprintf(&buf, "; %v records\n", len(recs))
+
+	_, err := buf.WriteTo(w)
+	return err
+}
+
+func fmtRecord(w io.Writer, rr libdns.Record) error {
+	ttl := int(rr.TTL / time.Second)
+	if ttl < 1 {
+		ttl = 1
+	}
+
+	_, err := fmt.Fprintf(w, "%s\t%v\tIN\t%s\t%s",
+		rr.Name,
+		ttl,
+		rr.Type,
+		rr.Value)
+
+	if err == nil {
+		if rr.ID != "" {
+			_, err = fmt.Fprintf(w, "\t; %s", rr.ID)
+		}
+	}
+
+	return err
+}

pkg/dns/sync.go

@@ -0,0 +1,347 @@
+package dns
+
+import (
+	"context"
+	"net/netip"
+	"sort"
+	"strings"
+	"time"
+
+	"darvaza.org/core"
+	"darvaza.org/slog"
+	"github.com/libdns/libdns"
+)
+
+// SyncAddrRecord is similar to AddrRecord but include libdns.Record details
+// fetched from the Provider
+type SyncAddrRecord struct {
+	Name  string
+	Addrs []SyncAddr
+}
+
+// SyncAddr extends netip.Addr with ID and TTL fetched from the Provider
+type SyncAddr struct {
+	ID   string
+	Addr netip.Addr
+	TTL  time.Duration
+}
+
+// Export assembles a libdns.Record
+func (rec *SyncAddr) Export(name string) libdns.Record {
+	return libdns.Record{
+		ID:    rec.ID,
+		Name:  name,
+		Type:  core.IIf(rec.Addr.Is6(), "AAAA", "A"),
+		TTL:   time.Second,
+		Value: rec.Addr.String(),
+	}
+}
+
+// SortSyncAddrSlice sorts a slice of [SyncAddr] by its address
+func SortSyncAddrSlice(s []SyncAddr) []SyncAddr {
+	sort.Slice(s, func(i, j int) bool {
+		a1 := s[i].Addr
+		a2 := s[j].Addr
+		return a1.Less(a2)
+	})
+	return s
+}
+
+// GetSyncRecords pulls all the address records on DNS for our domain
+func (mgr *Manager) GetSyncRecords(ctx context.Context) ([]SyncAddrRecord, error) {
+	recs, err := mgr.GetRecords(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	return mgr.asSyncRecords(recs)
+}
+
+// AsSyncAddr converts a A or AAAA [libdns.Record] into a [SyncAddr]
+func (mgr *Manager) AsSyncAddr(rr libdns.Record) (SyncAddr, bool, error) {
+	var out SyncAddr
+	var addr netip.Addr
+
+	// skip non-address types
+	if rr.Type != "A" && rr.Type != "AAAA" {
+		return out, false, nil
+	}
+
+	// skip entries not containing our suffix
+	if mgr.suffix != "" {
+		if !strings.HasSuffix(rr.Name, mgr.suffix) {
+			return out, false, nil
+		}
+	}
+
+	err := addr.UnmarshalText([]byte(rr.Value))
+	if err != nil {
+		// invalid address on A or AAAA record
+		return out, false, err
+	}
+
+	out = SyncAddr{
+		ID:   rr.ID,
+		TTL:  rr.TTL,
+		Addr: addr,
+	}
+
+	return out, true, nil
+}
+
+func (mgr *Manager) asSyncRecordsMap(recs []libdns.Record) map[string][]SyncAddr {
+	// filter and convert
+	out := make(map[string][]SyncAddr)
+	for _, rr := range recs {
+		addr, ok, err := mgr.AsSyncAddr(rr)
+		switch {
+		case err != nil:
+			// skip invalid addresses
+			mgr.l.Error().
+				WithField("subsystem", "dns").
+				WithField(slog.ErrorFieldName, err).
+				WithField("name", rr.Name).
+				WithField("type", rr.Type).
+				WithField("addr", rr.Value).
+				Print()
+		case ok:
+			// store
+			out[rr.Name] = append(out[rr.Name], addr)
+		}
+	}
+	return out
+}
+
+func (mgr *Manager) asSyncRecords(recs []libdns.Record) ([]SyncAddrRecord, error) {
+	cache := mgr.asSyncRecordsMap(recs)
+
+	// prepare records
+	out := make([]SyncAddrRecord, len(cache))
+	names := make([]string, 0, len(cache))
+	for name := range cache {
+		names = append(names, name)
+	}
+	sort.Strings(names)
+
+	for i, name := range names {
+		addrs := cache[name]
+
+		out[i] = SyncAddrRecord{
+			Name:  name,
+			Addrs: SortSyncAddrSlice(addrs),
+		}
+	}
+
+	return out, nil
+}
+
+// Sync updates all the address records on DNS for our domain
+func (mgr *Manager) Sync(ctx context.Context) error {
+	current, err := mgr.GetSyncRecords(ctx)
+	if err != nil {
+		return core.Wrap(err, "GetRecords")
+	}
+
+	goal := mgr.genAllAddrRecords()
+	for _, p := range makeSyncMap(current, goal) {
+		err := mgr.doSync(ctx, p.Name, p.Before, p.After)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (mgr *Manager) doSync(ctx context.Context, name string,
+	before []SyncAddr, after []netip.Addr) error {
+	//
+	var err error
+
+	for _, a := range after {
+		before, err = mgr.doSyncUpdateOrInsert(ctx, name, a, before)
+		if err != nil {
+			return err
+		}
+	}
+
+	for _, b := range before {
+		err = mgr.doSyncRemove(ctx, name, b)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (mgr *Manager) doSyncUpdateOrInsert(ctx context.Context, name string,
+	addr netip.Addr, addrs []SyncAddr) ([]SyncAddr, error) {
+	//
+	var err error
+
+	i, ok := findSyncAddrSorted(addr, addrs)
+	if ok {
+		rec := addrs[i]
+
+		addrs = append(addrs[:i], addrs[i+1:]...)
+		err = mgr.doSyncUpdate(ctx, name, addr, rec)
+	} else {
+		err = mgr.doSyncInsert(ctx, name, addr)
+	}
+
+	return addrs, err
+}
+
+func (mgr *Manager) doSyncUpdate(ctx context.Context, name string,
+	addr netip.Addr, rec SyncAddr) error {
+	//
+	var log slog.Logger
+	var msg string
+	var err error
+
+	if rec.TTL != time.Second {
+		// amend TTL
+
+		// TODO: batch updates
+		_, err = mgr.p.SetRecords(ctx, mgr.domain, []libdns.Record{
+			rec.Export(name),
+		})
+
+		if err == nil {
+			log = mgr.l.Info()
+			msg = "Updated"
+		} else {
+			log = mgr.l.Error().
+				WithField(slog.ErrorFieldName, err)
+			msg = "Failed"
+		}
+	} else {
+		log = mgr.l.Info()
+		msg = "OK"
+	}
+
+	log.
+		WithField("subsystem", "dns").
+		WithField("name", name).
+		WithField("addr", addr).
+		Print(msg)
+
+	return err
+}
+
+func (mgr *Manager) doSyncInsert(ctx context.Context, name string,
+	addr netip.Addr) error {
+	//
+	var log slog.Logger
+	var msg string
+
+	rec := libdns.Record{
+		Name:  name,
+		Type:  core.IIf(addr.Is6(), "AAAA", "A"),
+		TTL:   time.Second,
+		Value: addr.String(),
+	}
+
+	_, err := mgr.p.AppendRecords(ctx, mgr.domain, []libdns.Record{
+		rec,
+	})
+
+	if err != nil {
+		log = mgr.l.Error().
+			WithField(slog.ErrorFieldName, err)
+		msg = "Failed to Add"
+	} else {
+		log = mgr.l.Info()
+		msg = "Added"
+	}
+
+	log.
+		WithField("subsystem", "dns").
+		WithField("name", name).
+		WithField("addr", addr).
+		Print(msg)
+	return err
+}
+
+func (mgr *Manager) doSyncRemove(ctx context.Context, name string,
+	rec SyncAddr) error {
+	//
+	var log slog.Logger
+	var msg string
+
+	// TODO: batch deletes
+	_, err := mgr.p.DeleteRecords(ctx, mgr.domain, []libdns.Record{
+		rec.Export(name),
+	})
+
+	if err != nil {
+		log = mgr.l.Error().
+			WithField(slog.ErrorFieldName, err)
+		msg = "Failed to Delete"
+	} else {
+		log = mgr.l.Warn()
+		msg = "Deleted"
+	}
+
+	log.
+		WithField("subsystem", "dns").
+		WithField("name", name).
+		WithField("addr", rec.Addr).
+		Print(msg)
+	return err
+}
+
+func findSyncAddrSorted(target netip.Addr, addrs []SyncAddr) (int, bool) {
+	for i, a := range addrs {
+		switch target.Compare(a.Addr) {
+		case 0:
+			// match
+			return i, true
+		case -1:
+			// miss
+			return -1, false
+		default:
+			// next
+		}
+	}
+
+	return -1, false
+}
+
+type syncMapEntry struct {
+	Name   string
+	Before []SyncAddr
+	After  []netip.Addr
+}
+
+func makeSyncMap(current []SyncAddrRecord,
+	goal []AddrRecord) map[string]syncMapEntry {
+	//
+	data := make(map[string]syncMapEntry)
+
+	for _, cur := range current {
+		me, ok := data[cur.Name]
+		if !ok {
+			me = syncMapEntry{
+				Name: cur.Name,
+			}
+		}
+
+		me.Before = append(me.Before, cur.Addrs...)
+		data[cur.Name] = me
+	}
+
+	for _, rr := range goal {
+		me, ok := data[rr.Name]
+		if !ok {
+			me = syncMapEntry{
+				Name: rr.Name,
+			}
+		}
+		me.After = append(me.After, rr.Addr...)
+		data[rr.Name] = me
+	}
+
+	return data
+}

pkg/dns/write.go

@@ -0,0 +1,63 @@
+package dns
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"net/netip"
+)
+
+// WriteTo writes the DNS data for the cluster
+func (mgr *Manager) WriteTo(w io.Writer) (int64, error) {
+	var buf bytes.Buffer
+
+	cache := make(map[string][]netip.Addr)
+
+	// zones
+	for _, zoneName := range mgr.genZonesSorted() {
+		z := mgr.zones[zoneName]
+
+		mgr.writeZoneHosts(&buf, z)
+
+		// zone alias
+		addrs := mgr.genZoneAddresses(z)
+
+		rr := AddrRecord{
+			Name: mgr.fqdn(zoneName + mgr.suffix),
+			Addr: addrs,
+		}
+		_, _ = rr.WriteTo(&buf)
+
+		// and cache for regions
+		cache[zoneName] = addrs
+	}
+
+	// regions, sorted
+	for _, name := range mgr.genRegionsSorted() {
+		addrs := mgr.genRegionAddressesCached(name, cache)
+
+		mgr.writeRegionAddresses(&buf, name, addrs)
+	}
+
+	return buf.WriteTo(w)
+}
+
+func (mgr *Manager) writeZoneHosts(w io.Writer, z *Zone) {
+	_, _ = fmt.Fprintf(w, ";\n; %s\n;\n", z.Name)
+
+	for _, rr := range mgr.genZoneHostRecords(z) {
+		rr.Name = mgr.fqdn(rr.Name)
+		_, _ = rr.WriteTo(w)
+	}
+}
+
+func (mgr *Manager) writeRegionAddresses(w io.Writer, name string, addrs []netip.Addr) {
+	_, _ = fmt.Fprintf(w, "; %s\n", name)
+
+	rr := AddrRecord{
+		Name: mgr.fqdn(name + mgr.suffix),
+		Addr: addrs,
+	}
+
+	_, _ = rr.WriteTo(w)
+}

pkg/wireguard/config.go

@@ -23,12 +23,16 @@ var configTemplate = template.Must(template.New("config").Funcs(template.FuncMap
 		return strings.Join(s, sep)
 	},
 }).Parse(`[Interface]
+{{if .Interface.Name}}# Name: {{.Interface.Name}}
+{{end -}}
 Address = {{.Interface.Address}}
 PrivateKey = {{.Interface.PrivateKey}}
 ListenPort = {{.Interface.ListenPort}}
 {{- range .Peer }}
 
 [Peer]
+{{if .Name}}# Name: {{.Name}}
+{{end -}}
 PublicKey = {{.PublicKey}}
 Endpoint = {{.Endpoint}}
 AllowedIPs = {{ PrefixJoin .AllowedIPs ", "}}
@@ -64,6 +68,7 @@ func (f *Config) WriteTo(w io.Writer) (int64, error) {
 
 // InterfaceConfig represents the [Interface] section
 type InterfaceConfig struct {
+	Name       string
 	Address    netip.Addr
 	PrivateKey PrivateKey
 	ListenPort uint16
@@ -71,6 +76,7 @@ type InterfaceConfig struct {
 
 // PeerConfig represents a [Peer] section
 type PeerConfig struct {
+	Name       string
 	PublicKey  PublicKey
 	Endpoint   EndpointAddress
 	AllowedIPs []netip.Prefix
@@ -101,6 +107,11 @@ func (ep EndpointAddress) String() string {
 	}
 }
 
+// UnmarshalText loads an endpoint address from text data
+func (ep *EndpointAddress) UnmarshalText(b []byte) error {
+	return ep.FromString(string(b))
+}
+
 // FromString sets the EndpointAddress from a given "[host]:port"
 func (ep *EndpointAddress) FromString(s string) error {
 	host, port, err := core.SplitHostPort(s)
@@ -145,7 +156,7 @@ func (v *intermediateConfig) Export() (*Config, error) {
 	for i := 0; i < peers; i++ {
 		p, err := v.ExportPeer(i)
 		if err != nil {
-			err = core.Wrapf(err, "Peer[%v]:", i)
+			err = core.Wrap(err, "Peer[%v]:", i)
 			return nil, err
 		}
 
@@ -169,10 +180,12 @@ func (p interfaceConfig) Export() (InterfaceConfig, error) {
 		ListenPort: p.ListenPort,
 	}
 
-	out.PrivateKey, err = PrivateKeyFromBase64(p.PrivateKey)
-	if err != nil {
-		err = core.Wrap(err, "PrivateKey")
-		return InterfaceConfig{}, err
+	if p.PrivateKey != "" {
+		out.PrivateKey, err = PrivateKeyFromBase64(p.PrivateKey)
+		if err != nil {
+			err = core.Wrap(err, "PrivateKey")
+			return InterfaceConfig{}, err
+		}
 	}
 
 	return out, nil

pkg/wireguard/keys.go

@@ -51,12 +51,34 @@ func (pub PublicKey) String() string {
 	}
 }
 
-// MarshalJSON encodes the key for JSON, omiting empty.
+// UnmarshalText loads the value from base64
+func (key *PrivateKey) UnmarshalText(b []byte) error {
+	v, err := PrivateKeyFromBase64(string(b))
+	if err != nil {
+		return err
+	}
+
+	*key = v
+	return nil
+}
+
+// UnmarshalText loads the value from base64
+func (pub *PublicKey) UnmarshalText(b []byte) error {
+	v, err := PublicKeyFromBase64(string(b))
+	if err != nil {
+		return err
+	}
+
+	*pub = v
+	return nil
+}
+
+// MarshalJSON encodes the key for JSON, omitting empty.
 func (key PrivateKey) MarshalJSON() ([]byte, error) {
 	return encodeKeyJSON(key.String())
 }
 
-// MarshalJSON encodes the key for JSON, omiting empty.
+// MarshalJSON encodes the key for JSON, omitting empty.
 func (pub PublicKey) MarshalJSON() ([]byte, error) {
 	return encodeKeyJSON(pub.String())
 }
@@ -70,12 +92,12 @@ func encodeKeyJSON(s string) ([]byte, error) {
 	return out, nil
 }
 
-// MarshalYAML encodes the key for YAML, omiting empty.
+// MarshalYAML encodes the key for YAML, omitting empty.
 func (key PrivateKey) MarshalYAML() (any, error) {
 	return encodeKeyYAML(key.String())
 }
 
-// MarshalYAML encodes the key for YAML, omiting empty.
+// MarshalYAML encodes the key for YAML, omitting empty.
 func (pub PublicKey) MarshalYAML() (any, error) {
 	return encodeKeyYAML(pub.String())
 }
@@ -183,20 +205,14 @@ type KeyPair struct {
 // Validate checks the PublicKey matches the PrivateKey,
 // and sets the PublicKey if missing
 func (kp *KeyPair) Validate() error {
-	keyLen := len(kp.PrivateKey)
-	pubLen := len(kp.PublicKey)
-
 	switch {
-	case keyLen != PrivateKeySize:
-		// bad private key
+	case kp.PrivateKey.IsZero():
+		// no private key
 		return ErrInvalidPrivateKey
-	case pubLen == 0:
+	case kp.PublicKey.IsZero():
 		// no public key, set it
 		kp.PublicKey = kp.PrivateKey.Public()
 		return nil
-	case pubLen != PublicKeySize:
-		// bad public key
-		return ErrInvalidPublicKey
 	case !kp.PrivateKey.Public().Equal(kp.PublicKey):
 		// wrong public key
 		return ErrInvalidPublicKey

pkg/zones/env.go

@@ -1,102 +0,0 @@
-package zones
-
-import (
-	"bytes"
-	"fmt"
-	"io"
-	"strings"
-)
-
-// WriteEnv generates environment variables for shell scripts
-func (m *Zones) WriteEnv(w io.Writer) error {
-	var buf bytes.Buffer
-
-	m.writeEnvVarFn(&buf, genEnvZones, "ZONES")
-	m.ForEachZone(func(z *Zone) bool {
-		m.writeEnvZone(&buf, z)
-		return false
-	})
-
-	_, err := buf.WriteTo(w)
-	return err
-}
-
-func (m *Zones) writeEnvZone(w io.Writer, z *Zone) {
-	zoneID := z.ID
-
-	// ZONE{zoneID}
-	m.writeEnvVar(w, genEnvZoneNodes(z), "ZONE%v", zoneID)
-
-	// ZONE{zoneID}_NAME
-	m.writeEnvVar(w, z.Name, "ZONE%v_%s", zoneID, "NAME")
-
-	// ZONE{zoneID}_GW
-	gatewayID := getRingZeroGatewayID(z)
-	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")
-}
-
-func (m *Zones) writeEnvVarFn(w io.Writer, fn func(*Zones) string, name string, args ...any) {
-	var value string
-
-	if fn != nil {
-		value = fn(m)
-	}
-
-	m.writeEnvVar(w, value, name, args...)
-}
-
-func (*Zones) writeEnvVar(w io.Writer, value string, name string, args ...any) {
-	if len(args) > 0 {
-		name = fmt.Sprintf(name, args...)
-	}
-
-	if name != "" {
-		value = strings.TrimSpace(value)
-
-		_, _ = fmt.Fprintf(w, "%s=%q\n", name, value)
-	}
-}
-
-func genEnvZones(m *Zones) string {
-	s := make([]string, 0, len(m.Zones))
-	for _, z := range m.Zones {
-		s = append(s, fmt.Sprintf("%v", z.ID))
-	}
-
-	return strings.Join(s, " ")
-}
-
-func genEnvZoneNodes(z *Zone) string {
-	s := make([]string, 0, len(z.Machines))
-	for _, p := range z.Machines {
-		s = append(s, p.Name)
-	}
-	return strings.Join(s, " ")
-}
-
-func getRingZeroGatewayID(z *Zone) int {
-	var firstNodeID, gatewayID int
-
-	z.ForEachMachine(func(p *Machine) bool {
-		if firstNodeID == 0 {
-			firstNodeID = p.ID
-		}
-
-		if p.IsGateway() {
-			gatewayID = p.ID
-		}
-
-		return gatewayID != 0
-	})
-
-	switch {
-	case gatewayID == 0:
-		return firstNodeID
-	default:
-		return gatewayID
-	}
-}

pkg/zones/machine.go

@@ -1,53 +0,0 @@
-package zones
-
-import (
-	"net/netip"
-	"strings"
-)
-
-// revive:disable:line-length-limit
-
-// A Machine is a machine on a Zone
-type Machine struct {
-	zone *Zone
-	ID   int    `toml:"id"`
-	Name string `toml:"-" json:"-" yaml:"-"`
-
-	PublicAddresses []netip.Addr `toml:"public,omitempty" json:"public,omitempty" yaml:"public,omitempty"`
-	Rings           []*RingInfo  `toml:"rings,omitempty"  json:"rings,omitempty"  yaml:"rings,omitempty"`
-}
-
-// revive:enable:line-length-limit
-
-func (m *Machine) String() string {
-	return m.Name
-}
-
-// FullName returns the Name of the machine including domain name
-func (m *Machine) FullName() string {
-	if domain := m.zone.zones.domain; domain != "" {
-		var s = []string{
-			m.Name,
-			domain,
-		}
-
-		return strings.Join(s, ".")
-	}
-
-	return m.Name
-}
-
-// IsGateway tells if the Machine is a ring0 gateway
-func (m *Machine) IsGateway() bool {
-	_, ok := m.getRingInfo(0)
-	return ok
-}
-
-// Zone indicates the [Zone] this machine belongs to
-func (m *Machine) Zone() int {
-	return m.zone.ID
-}
-
-func (m *Machine) getPeerByName(name string) (*Machine, bool) {
-	return m.zone.zones.GetMachineByName(name)
-}

pkg/zones/machine_scan.go

@@ -1,63 +0,0 @@
-package zones
-
-import (
-	"context"
-	"net/netip"
-	"strconv"
-	"time"
-)
-
-func (m *Machine) lookupNetIP() ([]netip.Addr, error) {
-	timeout := 2 * time.Second
-	ctx, cancel := context.WithTimeout(context.Background(), timeout)
-
-	defer cancel()
-
-	return m.zone.zones.resolver.LookupNetIP(ctx, "ip", m.FullName())
-}
-
-func (m *Machine) updatePublicAddresses() error {
-	addrs, err := m.lookupNetIP()
-	if err != nil {
-		return err
-	}
-
-	m.PublicAddresses = addrs
-	return nil
-}
-
-func (m *Machine) init() error {
-	if err := m.setID(); err != nil {
-		return err
-	}
-
-	for i := 0; i < RingsCount; i++ {
-		if err := m.tryReadWireguardKeys(i); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-func (m *Machine) setID() error {
-	zoneName := m.zone.Name
-	suffix := m.Name[len(zoneName)+1:]
-
-	id, err := strconv.ParseInt(suffix, 10, 8)
-	if err != nil {
-		return err
-	}
-
-	m.ID = int(id)
-	return nil
-}
-
-func (m *Machine) scan() error {
-	for i := 0; i < RingsCount; i++ {
-		if err := m.tryApplyWireguardConfig(i); err != nil {
-			return err
-		}
-	}
-
-	return m.updatePublicAddresses()
-}

pkg/zones/scan.go

@@ -1,141 +0,0 @@
-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 {
-		return err
-	}
-
-	for _, e := range entries {
-		if e.IsDir() {
-			z := &Zone{
-				zones: m,
-				Name:  e.Name(),
-			}
-
-			if err := z.scan(); err != nil {
-				return err
-			}
-
-			m.Zones = append(m.Zones, z)
-		}
-	}
-
-	return nil
-}
-
-func (m *Zones) scanMachines() error {
-	var err error
-	m.ForEachMachine(func(p *Machine) bool {
-		err = p.scan()
-		return err != nil
-	})
-	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.Rings, func(i, j int) bool {
-			ri1 := p.Rings[i]
-			ri2 := p.Rings[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)
-	if err != nil {
-		return err
-	}
-
-	for _, e := range entries {
-		if e.IsDir() {
-			m := &Machine{
-				zone: z,
-				Name: e.Name(),
-			}
-
-			if err := m.init(); err != nil {
-				return err
-			}
-
-			z.Machines = append(z.Machines, m)
-		}
-	}
-
-	return nil
-}

pkg/zones/sync.go

@@ -1,33 +0,0 @@
-package zones
-
-// SyncAll updates all config files
-func (m *Zones) SyncAll() error {
-	for _, fn := range []func() error{
-		m.SyncAllWireguard,
-	} {
-		if err := fn(); err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
-// SyncAllWireguard updates all wireguard config files
-func (m *Zones) SyncAllWireguard() error {
-	var err error
-
-	for ring := 0; ring < RingsCount; ring++ {
-		err = m.PruneWireguardConfig(ring)
-		if err != nil {
-			return err
-		}
-
-		err = m.WriteWireguardKeys(ring)
-		if err != nil {
-			return err
-		}
-	}
-
-	return nil
-}

pkg/zones/zone_rings.go

@@ -1,55 +0,0 @@
-package zones
-
-import "os"
-
-// PruneWireguardConfig removes wgN.conf files of machines with
-// the corresponding ring disabled.
-func (z *Zone) PruneWireguardConfig(ring int) error {
-	return pruneWireguardConfig(z, ring)
-}
-
-// WriteWireguardKeys rewrites all wgN.{key,pub} files on this zone
-func (z *Zone) WriteWireguardKeys(ring int) error {
-	return writeWireguardKeys(z, ring)
-}
-
-// PruneWireguardConfig removes wgN.conf files of machines with
-// the corresponding ring disabled on all zones
-func (m *Zones) PruneWireguardConfig(ring int) error {
-	return pruneWireguardConfig(m, ring)
-}
-
-// WriteWireguardKeys rewrites all wgN.{key,pub} files
-func (m *Zones) WriteWireguardKeys(ring int) error {
-	return writeWireguardKeys(m, ring)
-}
-
-func pruneWireguardConfig(m MachineIterator, ring int) error {
-	var err error
-
-	m.ForEachMachine(func(p *Machine) bool {
-		_, ok := p.getRingInfo(ring)
-		if !ok {
-			err = p.RemoveWireguardConfig(ring)
-		}
-		return err != nil
-	})
-
-	return err
-}
-
-func writeWireguardKeys(m MachineIterator, ring int) error {
-	var err error
-
-	m.ForEachMachine(func(p *Machine) bool {
-		err = p.WriteWireguardKeys(ring)
-		if os.IsNotExist(err) {
-			// ignore
-			err = nil
-		}
-
-		return err != nil
-	})
-
-	return err
-}

pkg/zones/zones.go

@@ -1,136 +0,0 @@
-// Package zones contains information about the cluster
-package zones
-
-import (
-	"io/fs"
-	"path/filepath"
-
-	"github.com/hack-pad/hackpadfs/os"
-
-	"darvaza.org/resolver"
-)
-
-var (
-	_ MachineIterator = (*Zone)(nil)
-	_ MachineIterator = (*Zones)(nil)
-	_ ZoneIterator    = (*Zones)(nil)
-)
-
-// A MachineIterator is a set of Machines we can iterate on
-type MachineIterator interface {
-	ForEachMachine(func(*Machine) bool)
-}
-
-// A ZoneIterator is a set of Zones we can iterate on
-type ZoneIterator interface {
-	ForEachZone(func(*Zone) bool)
-}
-
-// Zone represents one zone in a cluster
-type Zone struct {
-	zones *Zones
-
-	ID   int    `toml:"id"`
-	Name string `toml:"name"`
-
-	Machines []*Machine `toml:"machines"`
-}
-
-func (z *Zone) String() string {
-	return z.Name
-}
-
-// ForEachMachine calls a function for each Machine in the zone
-// until instructed to terminate the loop
-func (z *Zone) ForEachMachine(fn func(*Machine) bool) {
-	for _, p := range z.Machines {
-		if fn(p) {
-			return
-		}
-	}
-}
-
-// Zones represents all zones in a cluster
-type Zones struct {
-	dir      fs.FS
-	resolver resolver.Resolver
-	domain   string
-
-	Zones []*Zone `toml:"zones"`
-}
-
-// ForEachMachine calls a function for each Machine in the cluster
-// until instructed to terminate the loop
-func (m *Zones) ForEachMachine(fn func(*Machine) bool) {
-	m.ForEachZone(func(z *Zone) bool {
-		var term bool
-
-		z.ForEachMachine(func(p *Machine) bool {
-			term = fn(p)
-			return term
-		})
-
-		return term
-	})
-}
-
-// ForEachZone calls a function for each Zone in the cluster
-// until instructed to terminate the loop
-func (m *Zones) ForEachZone(fn func(*Zone) bool) {
-	for _, p := range m.Zones {
-		if fn(p) {
-			// terminate
-			return
-		}
-	}
-}
-
-// 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()
-
-	z := &Zones{
-		dir:      dir,
-		resolver: resolver.NewResolver(lockuper),
-		domain:   domain,
-	}
-
-	if err := z.scan(); err != nil {
-		return nil, err
-	}
-
-	return z, nil
-}
-
-// New builds a [Zones] tree using the given directory
-func New(dir, domain string) (*Zones, error) {
-	dir, err := filepath.Abs(dir)
-	if err != nil {
-		return nil, err
-	}
-
-	base, err := os.NewFS().Sub(dir[1:])
-	if err != nil {
-		return nil, err
-	}
-
-	return NewFS(base, domain)
-}