cluster: add recursive RegionIterator to Zone

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

pkg/cluster/cluster_scan.go

@@ -4,7 +4,6 @@ import (
 	"io/fs"
 	"path"
 	"sort"
-	"strings"
 
 	"darvaza.org/core"
 )
@@ -13,10 +12,6 @@ const (
 	// ZoneRegionsFileName indicates the file containing
 	// region names as references
 	ZoneRegionsFileName = "regions"
-
-	// RegionClusterTokenFileName contains the kubernetes
-	// token of the cluster this region represents
-	RegionClusterTokenFileName = "k8s_token"
 )
 
 func (m *Cluster) scan(opts *ScanOptions) error {
@@ -191,8 +186,6 @@ func (z *Zone) scan() error {
 		switch {
 		case name == ZoneRegionsFileName:
 			err = z.loadRegions()
-		case name == RegionClusterTokenFileName:
-			err = z.loadClusterToken()
 		case e.IsDir():
 			err = z.scanSubdirectory(name)
 		default:
@@ -225,32 +218,6 @@ func (z *Zone) loadRegions() error {
 	return err
 }
 
-func (z *Zone) loadClusterToken() error {
-	var token string
-
-	filename := path.Join(z.Name, RegionClusterTokenFileName)
-	lines, err := z.zones.ReadLines(filename)
-	if err != nil {
-		return err
-	}
-
-	// first non-empty line
-	for _, s := range lines {
-		s = strings.TrimSpace(s)
-		if s != "" {
-			token = s
-			break
-		}
-	}
-
-	err = z.zones.setRegionClusterToken(z.Name, token)
-	if err != nil {
-		err = core.Wrap(err, filename)
-	}
-
-	return err
-}
-
 func (z *Zone) scanSubdirectory(name string) error {
 	m := &Machine{
 		zone:   z,

pkg/cluster/env.go

@@ -4,14 +4,12 @@ import (
 	"bytes"
 	"fmt"
 	"io"
-	"sort"
 	"strings"
 )
 
 // Env is a shell environment factory for this cluster
 type Env struct {
 	ZoneIterator
-	RegionIterator
 
 	cephFSID string
 	export   bool
@@ -25,10 +23,9 @@ func (m *Cluster) Env(export bool) (*Env, error) {
 	}
 
 	env := &Env{
-		ZoneIterator:   m,
-		RegionIterator: m,
-		cephFSID:       fsid.String(),
-		export:         export,
+		ZoneIterator: m,
+		cephFSID:     fsid.String(),
+		export:       export,
 	}
 
 	return env, nil
@@ -46,22 +43,6 @@ func (m *Env) Zones() []int {
 	return zones
 }
 
-// Regions returns the list of primary regions
-func (m *Env) Regions() []string {
-	var regions []string
-
-	m.ForEachRegion(func(r *Region) bool {
-		if r.Cluster != nil {
-			regions = append(regions, r.Name)
-		}
-
-		return false
-	})
-
-	sort.Strings(regions)
-	return regions
-}
-
 // WriteTo generates environment variables for shell scripts
 func (m *Env) WriteTo(w io.Writer) (int64, error) {
 	var buf bytes.Buffer
@@ -70,7 +51,6 @@ func (m *Env) WriteTo(w io.Writer) (int64, error) {
 		m.writeEnvVar(&buf, m.cephFSID, "FSID")
 	}
 
-	m.writeEnvVarStrings(&buf, m.Regions(), "REGIONS")
 	m.writeEnvVarInts(&buf, m.Zones(), "ZONES")
 
 	m.ForEachZone(func(z *Zone) bool {
@@ -94,9 +74,6 @@ func (m *Env) writeEnvZone(w io.Writer, z *Zone) {
 	gateways, _ := z.GatewayIDs()
 	m.writeEnvVarInts(w, gateways, "ZONE%v_%s", zoneID, "GW")
 
-	// ZONE{zoneID}_REGION
-	m.writeEnvVar(w, genEnvZoneRegion(z), "ZONE%v_%s", zoneID, "REGION")
-
 	// Ceph
 	monitors := z.GetCephMonitors()
 	// MON{zoneID}_NAME
@@ -108,29 +85,22 @@ func (m *Env) writeEnvZone(w io.Writer, z *Zone) {
 }
 
 func (m *Env) writeEnvVarInts(w io.Writer, value []int, name string, args ...any) {
-	var buf bytes.Buffer
+	var s string
 
-	for _, v := range value {
-		if buf.Len() > 0 {
-			_, _ = fmt.Fprint(&buf, " ")
+	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)
 		}
-		_, _ = fmt.Fprintf(&buf, "%v", v)
+
+		s = buf.String()
 	}
 
-	m.writeEnvVar(w, buf.String(), name, args...)
-}
-
-func (m *Env) writeEnvVarStrings(w io.Writer, value []string, name string, args ...any) {
-	var buf bytes.Buffer
-
-	for _, v := range value {
-		if buf.Len() > 0 {
-			_, _ = fmt.Fprint(&buf, " ")
-		}
-		_, _ = fmt.Fprintf(&buf, "%s", v)
-	}
-
-	m.writeEnvVar(w, buf.String(), name, args...)
+	m.writeEnvVar(w, s, name, args...)
 }
 
 func (m *Env) writeEnvVar(w io.Writer, value string, name string, args ...any) {
@@ -147,11 +117,7 @@ func (m *Env) writeEnvVar(w io.Writer, value string, name string, args ...any) {
 	if name != "" {
 		value = strings.TrimSpace(value)
 
-		if value == "" {
-			_, _ = fmt.Fprintf(w, "%s%s=\n", prefix, name)
-		} else {
-			_, _ = fmt.Fprintf(w, "%s%s=%q\n", prefix, name, value)
-		}
+		_, _ = fmt.Fprintf(w, "%s%s=%q\n", prefix, name, value)
 	}
 }
 
@@ -169,21 +135,6 @@ func genEnvZoneNodes(z *Zone) string {
 	return ""
 }
 
-func genEnvZoneRegion(z *Zone) string {
-	var region string
-
-	z.ForEachRegion(func(r *Region) bool {
-		if r.Cluster != nil {
-			region = r.Name
-			return true
-		}
-
-		return false
-	})
-
-	return region
-}
-
 func genEnvZoneCephMonNames(m Machines) string {
 	var buf strings.Builder
 	m.ForEachMachine(func(p *Machine) bool {

pkg/cluster/regions.go

@@ -24,7 +24,6 @@ type Region struct {
 	zones []*Zone
 
 	Name    string
-	Cluster *string  `json:",omitempty" yaml:",omitempty"`
 	Regions []string `json:",omitempty" yaml:",omitempty"`
 }
 
@@ -115,26 +114,6 @@ func (m *Cluster) setRegionZones(name string, zones ...*Zone) {
 	})
 }
 
-func (m *Cluster) setRegionClusterToken(name string, token string) error {
-	for i := range m.Regions {
-		r := &m.Regions[i]
-
-		if r.Name == name {
-			// found
-			r.Cluster = &token
-			return nil
-		}
-	}
-
-	// new
-	m.Regions = append(m.Regions, Region{
-		m:       m,
-		Name:    name,
-		Cluster: &token,
-	})
-	return nil
-}
-
 func (m *Cluster) appendRegionRegions(name string, subs ...string) {
 	for i := range m.Regions {
 		r := &m.Regions[i]
@@ -236,7 +215,11 @@ func (z *Zone) SyncRegions() error {
 	err := z.syncZoneRegions()
 	if err == nil {
 		z.ForEachMachine(func(p *Machine) bool {
-			err = z.syncMachineRegions(p)
+			if p.IsActive() {
+				err = p.RemoveFile("region")
+			} else {
+				err = p.WriteStringFile("none\n", "region")
+			}
 			return err != nil
 		})
 	}
@@ -244,24 +227,8 @@ func (z *Zone) SyncRegions() error {
 	return err
 }
 
-func (*Zone) syncMachineRegions(p *Machine) error {
-	var err error
-
-	if p.IsActive() {
-		err = p.RemoveFile("region")
-	} else {
-		err = p.WriteStringFile("none\n", "region")
-	}
-
-	if err == nil {
-		err = p.RemoveFile(RegionClusterTokenFileName)
-	}
-
-	return err
-}
-
 func (z *Zone) syncZoneRegions() error {
-	name := filepath.Join(z.Name, ZoneRegionsFileName)
+	name := filepath.Join(z.Name, "regions")
 
 	if len(z.Regions) > 0 {
 		var buf bytes.Buffer
@@ -280,25 +247,9 @@ func (z *Zone) syncZoneRegions() error {
 // SyncRegions writes to the file system the regions covered
 // by this meta-region
 func (r *Region) SyncRegions() error {
-	if err := r.syncRegionsFile(); err != nil {
-		return err
-	}
+	name := filepath.Join(r.Name, "regions")
 
-	return r.syncClusterFile()
-}
-
-func (r *Region) mkdir() error {
-	return r.m.MkdirAll(r.Name)
-}
-
-func (r *Region) syncRegionsFile() error {
-	var err error
-
-	name := filepath.Join(r.Name, ZoneRegionsFileName)
-
-	if len(r.Regions) == 0 {
-		err = r.m.RemoveFile(name)
-	} else if err = r.mkdir(); err == nil {
+	if len(r.Regions) > 0 {
 		var buf bytes.Buffer
 
 		for _, s := range r.Regions {
@@ -306,29 +257,12 @@ func (r *Region) syncRegionsFile() error {
 			_, _ = buf.WriteRune('\n')
 		}
 
-		err = r.m.WriteStringFile(buf.String(), name)
-	}
-
-	return err
-}
-
-func (r *Region) syncClusterFile() error {
-	var err error
-
-	name := filepath.Join(r.Name, RegionClusterTokenFileName)
-
-	if r.Cluster == nil {
-		err = r.m.RemoveFile(name)
-	} else if err = r.mkdir(); err == nil {
-		var buf bytes.Buffer
-
-		_, _ = buf.WriteString(*r.Cluster)
-		if buf.Len() > 0 {
-			_, _ = buf.WriteRune('\n')
+		if err := r.m.MkdirAll(r.Name); err != nil {
+			return err
 		}
 
-		err = r.m.WriteStringFile(buf.String(), name)
+		return r.m.WriteStringFile(buf.String(), name)
 	}
 
-	return err
+	return r.m.RemoveFile(name)
 }