Merge branch 'pr-amery-region-sort' into next-amery

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

cmd/jpictl/dns.go

@@ -52,7 +52,7 @@ func populateDNSManager(mgr *dns.Manager, m *cluster.Cluster) error {
 
 	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...)
+			err = mgr.AddHost(ctx, z.Name, p.ID, true, p.PublicAddresses...)
 			return err != nil
 		})
 

go.mod

@@ -17,7 +17,6 @@ require (
 	github.com/spf13/cobra v1.7.0
 	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
 )
 
@@ -48,5 +47,4 @@ require (
 	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

@@ -114,10 +114,6 @@ 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=
-gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

pkg/cluster/cluster_file.go

@@ -67,6 +67,15 @@ func (m *Cluster) ReadFile(name string, args ...any) ([]byte, error) {
 	return fs.ReadFile(m.dir, name)
 }
 
+// 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)
+}
+
 // 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) {
@@ -104,12 +113,3 @@ func (m *Cluster) WriteStringFile(value string, name string, args ...any) error
 	_, 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_scan.go

@@ -2,25 +2,17 @@ package cluster
 
 import (
 	"io/fs"
-	"path"
 	"sort"
 
 	"darvaza.org/core"
 )
 
-const (
-	// ZoneRegionsFileName indicates the file containing
-	// region names as references
-	ZoneRegionsFileName = "regions"
-)
-
 func (m *Cluster) scan(opts *ScanOptions) error {
 	for _, fn := range []func(*ScanOptions) error{
 		m.scanDirectory,
 		m.scanMachines,
 		m.scanZoneIDs,
 		m.scanSort,
-		m.initRegions,
 		m.scanGateways,
 		m.scanCephMonitors,
 	} {
@@ -32,7 +24,7 @@ func (m *Cluster) scan(opts *ScanOptions) error {
 	return nil
 }
 
-func (m *Cluster) scanDirectory(opts *ScanOptions) error {
+func (m *Cluster) scanDirectory(_ *ScanOptions) error {
 	// each directory is a zone
 	entries, err := fs.ReadDir(m.dir, ".")
 	if err != nil {
@@ -41,14 +33,16 @@ func (m *Cluster) scanDirectory(opts *ScanOptions) error {
 
 	for _, e := range entries {
 		if e.IsDir() {
-			ok, err := m.scanSubdirectory(opts, e.Name())
+			z, err := m.newZone(e.Name())
 			switch {
 			case err != nil:
 				return core.Wrap(err, e.Name())
-			case !ok:
+			case z.Machines.Len() == 0:
-				m.warn(nil).
+				z.warn(nil).
-					WithField("zone", e.Name()).
+					WithField("zone", z.Name).
 					Print("empty")
+			default:
+				m.Zones = append(m.Zones, z)
 			}
 		}
 	}
@@ -56,27 +50,6 @@ func (m *Cluster) scanDirectory(opts *ScanOptions) error {
 	return nil
 }
 
-func (m *Cluster) scanSubdirectory(_ *ScanOptions, name string) (bool, error) {
-	z, err := m.newZone(name)
-	switch {
-	case err != nil:
-		// somewhere went wrong scanning the subdirectory
-		return false, err
-	case z.Machines.Len() > 0:
-		// zones have machines and the regions they belong
-		m.Zones = append(m.Zones, z)
-		return true, nil
-	case len(z.Regions) > 0:
-		// regions have no machines but can include
-		// other regions
-		m.appendRegionRegions(name, z.Regions...)
-		return true, nil
-	default:
-		// empty
-		return false, nil
-	}
-}
-
 func (m *Cluster) newZone(name string) (*Zone, error) {
 	z := &Zone{
 		zones:  m,
@@ -181,68 +154,34 @@ func (z *Zone) scan() error {
 	}
 
 	for _, e := range entries {
-		name := e.Name()
+		if e.IsDir() {
+			m := &Machine{
+				zone:   z,
+				logger: z,
+				Name:   e.Name(),
+			}
 
-		switch {
+			m.debug().
-		case name == ZoneRegionsFileName:
+				WithField("node", m.Name).
-			err = z.loadRegions()
-		case e.IsDir():
-			err = z.scanSubdirectory(name)
-		default:
-			z.warn(nil).
 				WithField("zone", z.Name).
-				WithField("filename", name).
+				Print("found")
-				Print("unknown")
-		}
 
-		if err != nil {
+			if err := m.init(); err != nil {
-			return err
+				m.error(err).
+					WithField("node", m.Name).
+					WithField("zone", z.Name).
+					Print()
+
+				return err
+			}
+
+			z.Machines = append(z.Machines, m)
 		}
 	}
 
 	return nil
 }
 
-func (z *Zone) loadRegions() error {
-	filename := path.Join(z.Name, ZoneRegionsFileName)
-	regions, err := z.zones.ReadLines(filename)
-
-	if err == nil {
-		// parsed
-		err = z.appendRegions(regions...)
-		if err != nil {
-			err = core.Wrap(err, filename)
-		}
-	}
-
-	return err
-}
-
-func (z *Zone) scanSubdirectory(name string) error {
-	m := &Machine{
-		zone:   z,
-		logger: z,
-		Name:   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

pkg/cluster/machine.go

@@ -15,7 +15,6 @@ type Machine struct {
 	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"`
@@ -44,11 +43,6 @@ func (m *Machine) FullName() string {
 	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)

pkg/cluster/machine_file.go

@@ -53,14 +53,6 @@ func (m *Machine) ReadFile(name string, args ...any) ([]byte, error) {
 	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 {
 	fullName := m.getFilename(name, args...)

pkg/cluster/machine_scan.go

@@ -3,7 +3,6 @@ package cluster
 import (
 	"context"
 	"net/netip"
-	"os"
 	"strconv"
 	"strings"
 	"time"
@@ -82,30 +81,7 @@ func (m *Machine) scan(_ *ScanOptions) error {
 		}
 	}
 
-	return m.loadInactive()
+	return nil
-}
-
-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

pkg/cluster/regions.go

@@ -1,10 +1,5 @@
 package cluster
 
-import (
-	"bytes"
-	"path/filepath"
-)
-
 var (
 	_ MachineIterator = (*Region)(nil)
 	_ ZoneIterator    = (*Region)(nil)
@@ -37,9 +32,7 @@ func (r *Region) ForEachMachine(fn func(*Machine) bool) {
 		var term bool
 
 		z.ForEachMachine(func(p *Machine) bool {
-			if p.IsActive() {
+			term = fn(p)
-				term = fn(p)
-			}
 			return term
 		})
 
@@ -73,7 +66,7 @@ func (m *Cluster) initRegions(_ *ScanOptions) error {
 
 	// bind first level regions and their zones
 	for name, zones := range regions {
-		m.setRegionZones(name, zones...)
+		m.syncRegions(name, zones...)
 	}
 
 	// and combine zones to produce larger regions
@@ -86,10 +79,8 @@ func (m *Cluster) initRegions(_ *ScanOptions) error {
 	return nil
 }
 
-func (m *Cluster) setRegionZones(name string, zones ...*Zone) {
+func (m *Cluster) syncRegions(name string, zones ...*Zone) {
-	for i := range m.Regions {
+	for _, r := range m.Regions {
-		r := &m.Regions[i]
-
 		if r.Name == name {
 			// found
 			r.m = m
@@ -106,38 +97,6 @@ func (m *Cluster) setRegionZones(name string, zones ...*Zone) {
 	})
 }
 
-func (m *Cluster) appendRegionRegions(name string, subs ...string) {
-	for i := range m.Regions {
-		r := &m.Regions[i]
-
-		if name == r.Name {
-			// found
-			r.Regions = append(r.Regions, subs...)
-			return
-		}
-	}
-
-	// new
-	m.Regions = append(m.Regions, Region{
-		Name:    name,
-		Regions: subs,
-	})
-}
-
-func (z *Zone) appendRegions(regions ...string) error {
-	for _, s := range regions {
-		// TODO: validate
-		z.debug().
-			WithField("zone", z.Name).
-			WithField("region", s).
-			Print("attached")
-
-		z.Regions = append(z.Regions, s)
-	}
-
-	return nil
-}
-
 func (m *Cluster) finishRegion(r *Region) {
 	if r.m != nil {
 		// ready
@@ -171,61 +130,3 @@ func (m *Cluster) getRegion(name string) (*Region, bool) {
 
 	return nil, false
 }
-
-// SyncRegions writes to the file system the regions this [Zone]
-// belongs to.
-func (z *Zone) SyncRegions() error {
-	err := z.syncZoneRegions()
-	if err == nil {
-		z.ForEachMachine(func(p *Machine) bool {
-			if p.IsActive() {
-				err = p.RemoveFile("region")
-			} else {
-				err = p.WriteStringFile("none\n", "region")
-			}
-			return err != nil
-		})
-	}
-
-	return err
-}
-
-func (z *Zone) syncZoneRegions() error {
-	name := filepath.Join(z.Name, "regions")
-
-	if len(z.Regions) > 0 {
-		var buf bytes.Buffer
-
-		for _, s := range z.Regions {
-			_, _ = buf.WriteString(s)
-			_, _ = buf.WriteRune('\n')
-		}
-
-		return z.zones.WriteStringFile(buf.String(), name)
-	}
-
-	return z.zones.RemoveFile(name)
-}
-
-// SyncRegions writes to the file system the regions covered
-// by this meta-region
-func (r *Region) SyncRegions() error {
-	name := filepath.Join(r.Name, "regions")
-
-	if len(r.Regions) > 0 {
-		var buf bytes.Buffer
-
-		for _, s := range r.Regions {
-			_, _ = buf.WriteString(s)
-			_, _ = buf.WriteRune('\n')
-		}
-
-		if err := r.m.MkdirAll(r.Name); err != nil {
-			return err
-		}
-
-		return r.m.WriteStringFile(buf.String(), name)
-	}
-
-	return r.m.RemoveFile(name)
-}

pkg/cluster/sync.go

@@ -6,7 +6,6 @@ func (m *Cluster) SyncAll() error {
 		m.SyncMkdirAll,
 		m.SyncAllWireguard,
 		m.SyncAllCeph,
-		m.SyncAllRegions,
 		m.WriteHosts,
 	} {
 		if err := fn(); err != nil {
@@ -59,24 +58,3 @@ func (m *Cluster) SyncAllCeph() error {
 
 	return m.WriteCephConfig(cfg)
 }
-
-// SyncAllRegions rewrites all region data
-func (m *Cluster) SyncAllRegions() error {
-	var err error
-
-	m.ForEachZone(func(z *Zone) bool {
-		err := z.SyncRegions()
-		return err != nil
-	})
-
-	if err != nil {
-		return err
-	}
-
-	m.ForEachRegion(func(r *Region) bool {
-		err = r.SyncRegions()
-		return err != nil
-	})
-
-	return err
-}

pkg/wireguard/config.go

@@ -2,7 +2,6 @@ package wireguard
 
 import (
 	"bytes"
-	"errors"
 	"fmt"
 	"io"
 	"net/netip"
@@ -10,8 +9,8 @@ import (
 	"strings"
 	"text/template"
 
+	"asciigoat.org/ini/basic"
 	"darvaza.org/core"
-	"gopkg.in/gcfg.v1"
 )
 
 var configTemplate = template.Must(template.New("config").Funcs(template.FuncMap{
@@ -132,100 +131,6 @@ func (ep *EndpointAddress) FromString(s string) error {
 	return nil
 }
 
-type intermediateConfig struct {
-	Interface interfaceConfig
-	Peer      peersConfig
-}
-
-func (v *intermediateConfig) Export() (*Config, error) {
-	var out Config
-	var err error
-
-	// Interface
-	out.Interface, err = v.Interface.Export()
-	if err != nil {
-		return nil, err
-	}
-
-	// Peers
-	peers, ok := v.PeersCount()
-	if !ok {
-		return nil, errors.New("inconsistent Peer data")
-	}
-
-	for i := 0; i < peers; i++ {
-		p, err := v.ExportPeer(i)
-		if err != nil {
-			err = core.Wrap(err, "Peer[%v]:", i)
-			return nil, err
-		}
-
-		out.Peer = append(out.Peer, p)
-	}
-
-	return &out, nil
-}
-
-type interfaceConfig struct {
-	Address    netip.Addr
-	PrivateKey string
-	ListenPort uint16
-}
-
-func (p interfaceConfig) Export() (InterfaceConfig, error) {
-	var err error
-
-	out := InterfaceConfig{
-		Address:    p.Address,
-		ListenPort: p.ListenPort,
-	}
-
-	if p.PrivateKey != "" {
-		out.PrivateKey, err = PrivateKeyFromBase64(p.PrivateKey)
-		if err != nil {
-			err = core.Wrap(err, "PrivateKey")
-			return InterfaceConfig{}, err
-		}
-	}
-
-	return out, nil
-}
-
-type peersConfig struct {
-	PublicKey  []string
-	Endpoint   []string
-	AllowedIPs []string
-}
-
-func (v *intermediateConfig) ExportPeer(i int) (PeerConfig, error) {
-	var out PeerConfig
-
-	// Endpoint
-	s := v.Peer.Endpoint[i]
-	err := out.Endpoint.FromString(s)
-	if err != nil {
-		err = core.Wrap(err, "Endpoint")
-		return out, err
-	}
-
-	// PublicKey
-	out.PublicKey, err = PublicKeyFromBase64(v.Peer.PublicKey[i])
-	if err != nil {
-		err = core.Wrap(err, "PublicKey")
-		return out, err
-	}
-
-	// AllowedIPs
-	s = v.Peer.AllowedIPs[i]
-	out.AllowedIPs, err = parseAllowedIPs(s)
-	if err != nil {
-		err = core.Wrap(err, "AllowedIPs")
-		return out, err
-	}
-
-	return out, nil
-}
-
 func parseAllowedIPs(data string) ([]netip.Prefix, error) {
 	var out []netip.Prefix
 
@@ -242,25 +147,17 @@ func parseAllowedIPs(data string) ([]netip.Prefix, error) {
 	return out, nil
 }
 
-func (v *intermediateConfig) PeersCount() (int, bool) {
-	c0 := len(v.Peer.Endpoint)
-	c1 := len(v.Peer.PublicKey)
-	c2 := len(v.Peer.AllowedIPs)
-
-	if c0 != c1 || c1 != c2 {
-		return 0, false
-	}
-
-	return c0, true
-}
-
 // NewConfigFromReader parses a wgN.conf file
 func NewConfigFromReader(r io.Reader) (*Config, error) {
-	temp := &intermediateConfig{}
+	doc, err := basic.Decode(r)
-
+	if err != nil {
-	if err := gcfg.ReadInto(temp, r); err != nil {
 		return nil, err
 	}
 
-	return temp.Export()
+	cfg, err := newConfigFromDocument(doc)
+	if err != nil {
+		return nil, err
+	}
+
+	return cfg, nil
 }

pkg/wireguard/config_parser.go

@@ -0,0 +1,169 @@
+package wireguard
+
+import (
+	"io/fs"
+	"strconv"
+
+	"asciigoat.org/ini/basic"
+	"darvaza.org/core"
+)
+
+type sectionHandler func(*Config, *basic.Section) error
+
+var sectionMap = map[string]func(*Config, *basic.Section) error{
+	"Interface": loadInterfaceConfSection,
+	"Peer":      loadPeerConfSection,
+}
+
+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 loadInterfaceConfSection(out *Config, src *basic.Section) error {
+	var cfg InterfaceConfig
+
+	for _, field := range src.Fields {
+		if err := loadInterfaceConfField(&cfg, field); err != nil {
+			return core.Wrap(err, "Interface")
+		}
+	}
+
+	out.Interface = cfg
+	return nil
+}
+
+func loadPeerConfSection(out *Config, src *basic.Section) error {
+	var cfg PeerConfig
+
+	for _, field := range src.Fields {
+		if err := loadPeerConfField(&cfg, field); err != nil {
+			return core.Wrap(err, "Peer[%v]", len(out.Peer))
+		}
+	}
+
+	out.Peer = append(out.Peer, cfg)
+	return nil
+}
+
+// revive:disable:cyclomatic
+// revive:disable:cognitive-complexity
+
+func loadInterfaceConfField(cfg *InterfaceConfig, 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 "Address":
+		if !core.IsZero(cfg.Address) {
+			return core.Wrap(fs.ErrInvalid, "duplicate field %q", field.Key)
+		}
+
+		err := cfg.Address.UnmarshalText([]byte(field.Value))
+		switch {
+		case err != nil:
+			return core.Wrap(err, field.Key)
+		default:
+			return nil
+		}
+	case "PrivateKey":
+		if !core.IsZero(cfg.PrivateKey) {
+			return core.Wrap(fs.ErrInvalid, "duplicate field %q", field.Key)
+		}
+
+		err := cfg.PrivateKey.UnmarshalText([]byte(field.Value))
+		switch {
+		case err != nil:
+			return core.Wrap(err, field.Key)
+		default:
+			return nil
+		}
+	case "ListenPort":
+		if cfg.ListenPort > 0 {
+			return core.Wrap(fs.ErrInvalid, "duplicate field %q", field.Key)
+		}
+
+		u64, err := strconv.ParseUint(field.Value, 10, 16)
+		switch {
+		case err != nil:
+			return core.Wrap(err, field.Key)
+		case u64 == 0:
+			return core.Wrap(fs.ErrInvalid, "invalid %q value", field.Key)
+		default:
+			cfg.ListenPort = uint16(u64)
+			return nil
+		}
+	default:
+		return core.Wrap(fs.ErrInvalid, "unknown field %q", field.Key)
+	}
+}
+
+// revive:disable:cyclomatic
+// revive:disable:cognitive-complexity
+
+func loadPeerConfField(cfg *PeerConfig, field basic.Field) error {
+	// revive:enable:cyclomatic
+	// revive:enable:cognitive-complexity
+
+	switch field.Key {
+	case "PublicKey":
+		if !core.IsZero(cfg.PublicKey) {
+			return core.Wrap(fs.ErrInvalid, "duplicate field %q", field.Key)
+		}
+
+		err := cfg.PublicKey.UnmarshalText([]byte(field.Value))
+		switch {
+		case err != nil:
+			return core.Wrap(err, field.Key)
+		default:
+			return nil
+		}
+	case "Endpoint":
+		if cfg.Endpoint.String() != "" {
+			return core.Wrap(fs.ErrInvalid, "duplicate field %q", field.Key)
+		}
+
+		err := cfg.Endpoint.UnmarshalText([]byte(field.Value))
+		switch {
+		case err != nil:
+			return core.Wrap(err, field.Key)
+		default:
+			return nil
+		}
+	case "AllowedIPs":
+		s, err := parseAllowedIPs(field.Value)
+		switch {
+		case err != nil:
+			return core.Wrap(err, field.Key)
+		case len(s) > 0:
+			cfg.AllowedIPs = append(cfg.AllowedIPs, s...)
+			return nil
+		}
+	default:
+		return core.Wrap(fs.ErrInvalid, "unknown field %q", field.Key)
+	}
+	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/wireguard/keys.go

@@ -54,23 +54,25 @@ func (pub PublicKey) String() string {
 // UnmarshalText loads the value from base64
 func (key *PrivateKey) UnmarshalText(b []byte) error {
 	v, err := PrivateKeyFromBase64(string(b))
-	if err != nil {
+	switch {
+	case err != nil:
 		return err
+	default:
+		*key = v
+		return nil
 	}
-
-	*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 {
+	switch {
+	case err != nil:
 		return err
+	default:
+		*pub = v
+		return nil
 	}
-
-	*pub = v
-	return nil
 }
 
 // MarshalJSON encodes the key for JSON, omitting empty.