DNS [WIP]

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

cmd/jpictl/dns.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"github.com/spf13/cobra"
+)
+
+// Command
+var dnsCmd = &cobra.Command{
+	Use: "dns",
+}
+
+var dnsSyncCmd = &cobra.Command{
+	Use: "sync",
+	RunE: func(_ *cobra.Command, _ []string) error {
+		_, err := cfg.LoadZones(true)
+		return err
+	},
+}
+
+var dnsWriteCmd = &cobra.Command{
+	Use: "write",
+	RunE: func(_ *cobra.Command, _ []string) error {
+		return nil
+	},
+}
+
+var dnsAddCmd = &cobra.Command{
+	Use: "add",
+	RunE: func(_ *cobra.Command, _ []string) error {
+		return nil
+	},
+}
+
+var dnsRemoveCmd = &cobra.Command{
+	Use: "remove",
+	RunE: func(_ *cobra.Command, _ []string) error {
+		return nil
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(dnsCmd)
+
+	dnsCmd.AddCommand(dnsSyncCmd)
+	dnsCmd.AddCommand(dnsWriteCmd)
+	dnsCmd.AddCommand(dnsAddCmd)
+	dnsCmd.AddCommand(dnsRemoveCmd)
+}

go.mod

@@ -11,6 +11,8 @@ require (
 	darvaza.org/slog/handlers/discard v0.4.5
 	github.com/gofrs/uuid/v5 v5.0.0
 	github.com/hack-pad/hackpadfs v0.2.1
+	github.com/libdns/cloudflare v0.1.0
+	github.com/libdns/libdns v0.2.1
 	github.com/mgechev/revive v1.3.3
 	github.com/spf13/cobra v1.7.0
 	golang.org/x/crypto v0.12.0

go.sum

@@ -36,6 +36,11 @@ github.com/hack-pad/hackpadfs v0.2.1 h1:FelFhIhv26gyjujoA/yeFO+6YGlqzmc9la/6iKMI
 github.com/hack-pad/hackpadfs v0.2.1/go.mod h1:khQBuCEwGXWakkmq8ZiFUvUZz84ZkJ2KNwKvChs4OrU=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/libdns/cloudflare v0.1.0 h1:93WkJaGaiXCe353LHEP36kAWCUw0YjFqwhkBkU2/iic=
+github.com/libdns/cloudflare v0.1.0/go.mod h1:a44IP6J1YH6nvcNl1PverfJviADgXUnsozR3a7vBKN8=
+github.com/libdns/libdns v0.2.0/go.mod h1:yQCXzk1lEZmmCPa857bnk4TsOiqYasqpyOEeSObbb40=
+github.com/libdns/libdns v0.2.1 h1:Wu59T7wSHRgtA0cfxC+n1c/e+O3upJGWytknkmFEDis=
+github.com/libdns/libdns v0.2.1/go.mod h1:yQCXzk1lEZmmCPa857bnk4TsOiqYasqpyOEeSObbb40=
 github.com/mattn/go-colorable v0.1.12/go.mod h1:u5H1YNBxpqRaxsYJYSkiCWKzEfiAb1Gb520KVy5xxl4=
 github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
 github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=

pkg/cluster/defaults.go

@@ -15,3 +15,8 @@ func DefaultLogger() slog.Logger {
 func DefaultLookuper() resolver.Lookuper {
 	return resolver.NewCloudflareLookuper()
 }
+
+// DefaultResolver returns a [resolver.Resolver] using Cloudflare's 1.1.1.1
+func DefaultResolver() resolver.Resolver {
+	return resolver.NewResolver(DefaultLookuper())
+}

pkg/dns/dns.go

@@ -0,0 +1,12 @@
+// Package dns manages DNS entries for the cluster
+package dns
+
+// A Region describes where a Zone is
+type Region struct {
+	// Name is the identifier of this Region
+	Name string
+	// Regions are a list of (sub)regions that belong to this Region
+	Regions []string
+	// Zones are a list of Zones that directly belong to this Region
+	Zones []string
+}

pkg/dns/manager.go

@@ -0,0 +1,121 @@
+package dns
+
+import (
+	"darvaza.org/core"
+	"darvaza.org/resolver"
+	"darvaza.org/slog"
+
+	"git.jpi.io/amery/jpictl/pkg/cluster"
+)
+
+// Manager is a DNS Manager instance
+type Manager struct {
+	p Provider
+	r resolver.Resolver
+	l slog.Logger
+}
+
+// ManagerOption configures a Manager
+type ManagerOption func(*Manager) error
+
+func newErrorManagerOption(err error, hint string) ManagerOption {
+	return func(*Manager) error {
+		if hint != "" {
+			err = core.Wrap(err, hint)
+		}
+		return err
+	}
+}
+
+// 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
+	}
+}
+
+// WithLookuper attaches a resolver.Lookuper to the Manager
+func WithLookuper(h resolver.Lookuper) ManagerOption {
+	if h == nil {
+		h = cluster.DefaultLookuper()
+	}
+
+	return func(mgr *Manager) error {
+		mgr.r = resolver.NewResolver(h)
+		return nil
+	}
+}
+
+// WithResolver attaches a resolver.Resolver to the Manager
+func WithResolver(r resolver.Resolver) ManagerOption {
+	if r == nil {
+		r = cluster.DefaultResolver()
+	}
+
+	return func(mgr *Manager) error {
+		mgr.r = r
+		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.p == nil {
+		opts = append(opts, WithProvider(nil))
+	}
+
+	if mgr.r == nil {
+		opts = append(opts, WithResolver(nil))
+	}
+
+	if mgr.l == nil {
+		opts = append(opts, WithLogger(nil))
+	}
+
+	for _, opt := range opts {
+		if err := opt(mgr); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// NewManager creates a DNS manager with the
+func NewManager(opts ...ManagerOption) (*Manager, error) {
+	mgr := new(Manager)
+
+	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
+}

pkg/dns/provider.go

@@ -0,0 +1,36 @@
+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
+}
+
+// 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
+}