Merge pull request 'zones: add methods to work with files at the root of m/' (#6)

Reviewed-on: #6

pkg/zones/env.go

@@ -22,11 +22,23 @@ func (m *Zones) Env(export bool) *Env {
 	}
 }
 
+// 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
 
-	m.writeEnvVarFn(&buf, genEnvZones, "ZONES")
+	m.writeEnvVarInts(&buf, m.Zones(), "ZONES")
 	m.ForEachZone(func(z *Zone) bool {
 		m.writeEnvZone(&buf, z)
 		return false
@@ -45,25 +57,27 @@ func (m *Env) writeEnvZone(w io.Writer, z *Zone) {
 	m.writeEnvVar(w, z.Name, "ZONE%v_%s", zoneID, "NAME")
 
 	// ZONE{zoneID}_GW
-	gatewayID := getRingZeroGatewayID(z)
-	if gatewayID > 0 {
-		m.writeEnvVar(w, fmt.Sprintf("%v", gatewayID), "ZONE%v_%s", zoneID, "GW")
-
-		// ZONE{zoneID}_IP
-		if ip, ok := RingZeroAddress(zoneID, gatewayID); ok {
-			m.writeEnvVar(w, ip.String(), "ZONE%v_%s", zoneID, "IP")
-		}
-	}
+	gateways, _ := z.GatewayIDs()
+	m.writeEnvVarInts(w, gateways, "ZONE%v_%s", zoneID, "GW")
 }
 
-func (m *Env) writeEnvVarFn(w io.Writer, fn func(*Env) string, name string, args ...any) {
-	var value string
+func (m *Env) writeEnvVarInts(w io.Writer, value []int, name string, args ...any) {
+	var s string
 
-	if fn != nil {
-		value = fn(m)
+	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, value, name, args...)
+	m.writeEnvVar(w, s, name, args...)
 }
 
 func (m *Env) writeEnvVar(w io.Writer, value string, name string, args ...any) {
@@ -84,35 +98,16 @@ func (m *Env) writeEnvVar(w io.Writer, value string, name string, args ...any) {
 	}
 }
 
-func genEnvZones(m *Env) string {
-	var s []string
-
-	m.ForEachZone(func(z *Zone) bool {
-		s = append(s, fmt.Sprintf("%v", z.ID))
-		return false
-	})
-
-	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)
+	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 strings.Join(s, " ")
-}
-
-func getRingZeroGatewayID(z *Zone) int {
-	var gatewayID int
-
-	z.ForEachMachine(func(p *Machine) bool {
-		if p.IsGateway() {
-			gatewayID = p.ID
-		}
-
-		return gatewayID != 0
-	})
-
-	return gatewayID
+	return ""
 }

pkg/zones/zones_file.go

@@ -0,0 +1,46 @@
+package zones
+
+import (
+	"fmt"
+	"io"
+	"os"
+
+	fs "github.com/hack-pad/hackpadfs"
+)
+
+// OpenFile opens a file on the cluster's config directory with the specified flags
+func (m *Zones) 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 *Zones) 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 *Zones) CreateFile(name string, args ...any) (io.WriteCloser, error) {
+	return m.openWriter(name, os.O_CREATE, args...)
+}
+
+func (m *Zones) 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
+	}
+
+	return f.(io.WriteCloser), nil
+}
+
+// ReadFile reads a file from the cluster's config directory
+func (m *Zones) ReadFile(name string, args ...any) ([]byte, error) {
+	if len(args) > 0 {
+		name = fmt.Sprintf(name, args...)
+	}
+
+	return fs.ReadFile(m.dir, name)
+}