utils: networks

2 files changed, 129 insertions, 123 deletions

diff --git a/utils/ipam/ipam.go b/utils/ipam/ipam.go
new file mode 100644
index 0000000..faec6e7
--- /dev/null
+++ b/utils/ipam/ipam.go
@@ -0,0 +1,120 @@
+package ipam
+
+import (
+	"cmp"
+	"fmt"
+	"log"
+	"net/netip"
+	"utils/ipam/yaml_model"
+)
+
+func LoadIpam(bs []byte) (*Ipam, error) {
+	parsed, err := yaml_model.Parse(bs)
+	if err != nil {
+		return nil, err
+	}
+
+	ipam_, err := processNetworks(parsed.Ipam6.Networks)
+	if err != nil {
+		return nil, err
+	}
+
+	ipam_.ResolveParents()
+
+	return ipam_, nil
+}
+
+type Ipam struct {
+	Networks []*Network
+}
+
+func contains(a, b netip.Prefix) bool {
+	return b.Bits() > a.Bits() && b.Overlaps(a)
+}
+
+func (ipam *Ipam) ResolveParents() {
+	for _, n := range ipam.Networks {
+		log.Printf("network %s/%s", n.Name, n.Prefix)
+		for _, p := range ipam.Networks {
+			if n == p {
+				continue
+			}
+			log.Printf(" candidate %s/%s", p.Name, p.Prefix)
+			if contains(p.Prefix, n.Prefix) {
+				if n.Parent == nil {
+					log.Printf(" found parent %s/%s", p.Name, p.Prefix)
+					n.Parent = p
+				} else {
+					if n.Parent.Prefix.Bits() < p.Prefix.Bits() {
+						log.Printf(" found better parent %s/%s", p.Name, p.Prefix)
+						n.Parent = p
+					}
+				}
+			}
+		}
+	}
+
+	return
+}
+
+func (ipam *Ipam) FindRoots() []*Network {
+	var ns []*Network
+
+	for _, n := range ipam.Networks {
+		if n.Parent == nil {
+			ns = append(ns, n)
+		}
+	}
+
+	return ns
+}
+
+type Network struct {
+	Name   string
+	Parent *Network
+	Prefix netip.Prefix
+	hosts  []networkHost
+}
+
+func CompareNetwork(a, b *Network) int {
+	return cmp.Compare(a.Name, b.Name)
+}
+
+func (n *Network) Compare(other *Network) int {
+	return cmp.Compare(n.Name, other.Name)
+}
+
+type networkHost struct {
+	name    string
+	address netip.Addr
+}
+
+func processNetworks(networks map[string]yaml_model.Network6Yaml) (*Ipam, error) {
+	var ns []*Network
+
+	for name, net := range networks {
+		log.Printf("Processing net %v\n", name)
+		prefix, err := netip.ParsePrefix(net.Range)
+		if err != nil {
+			return nil, fmt.Errorf("error parsing net range: %v", err)
+		}
+		log.Printf("prefix: %s", prefix.String())
+
+		n := Network{Name: name, Prefix: prefix}
+		for hostname, a := range net.Hosts {
+			addr, err := netip.ParseAddr(a)
+			if err != nil {
+				return nil, fmt.Errorf("network: %s, unable to parse host address %s", n.Name, a)
+			}
+
+			n.hosts = append(n.hosts, networkHost{
+				name:    hostname,
+				address: addr,
+			})
+		}
+
+		ns = append(ns, &n)
+	}
+
+	return &Ipam{Networks: ns}, nil
+}
diff --git a/utils/networks/networks.go b/utils/networks/networks.go
index 328f006..f667f05 100644
--- a/utils/networks/networks.go
+++ b/utils/networks/networks.go
@@ -1,13 +1,10 @@
 package networks
 
 import (
-	"cmp"
 	"fmt"
-	"log"
-	"net/netip"
 	"os"
 	"slices"
-	"utils/ipam/yaml_model"
+	Ipam "utils/ipam"
 )
 
 func RunNetworks() error {
@@ -17,13 +14,13 @@ func RunNetworks() error {
 		return err
 	}
 
-	ipam, err := loadIpam(bs)
+	ipam, err := Ipam.LoadIpam(bs)
 	if err != nil {
 		return err
 	}
 
-	networks := slices.SortedFunc(slices.Values(ipam.networks), CompareNetwork)
-	roots := slices.SortedFunc(slices.Values(ipam.FindRoots()), CompareNetwork)
+	networks := slices.SortedFunc(slices.Values(ipam.Networks), Ipam.CompareNetwork)
+	roots := slices.SortedFunc(slices.Values(ipam.FindRoots()), Ipam.CompareNetwork)
 
 	fmt.Printf("digraph {\n")
 	//fmt.Printf(" layout=dot\n")
@@ -45,21 +42,21 @@ func RunNetworks() error {
 	fmt.Printf("\n")
 	fmt.Printf("  # Nodes\n")
 	for _, n := range networks {
-		fmt.Printf("  %s [ label = \"%s\\n%s\"];\n", n.name, n.name, n.prefix)
+		fmt.Printf("  %s [ label = \"%s\\n%s\"];\n", n.Name, n.Name, n.Prefix)
 	}
 
 	fmt.Printf("\n")
 	fmt.Printf("  # Roots\n")
 	for _, n := range roots {
-		fmt.Printf("  %s [ root = true ];\n", n.name)
+		fmt.Printf("  %s [ root = true ];\n", n.Name)
 	}
 
 	fmt.Printf("\n")
 	fmt.Printf("  # Relationships\n")
 	for _, n := range networks {
-		for _, c := range ipam.networks {
-			if c.parent == n {
-				fmt.Printf("  %s -> %s", n.name, c.name)
+		for _, c := range ipam.Networks {
+			if c.Parent == n {
+				fmt.Printf("  %s -> %s", n.Name, c.Name)
 				fmt.Printf(";\n")
 			}
 		}
@@ -68,114 +65,3 @@ func RunNetworks() error {
 
 	return nil
 }
-
-func loadIpam(bs []byte) (*Ipam, error) {
-	parsed, err := yaml_model.Parse(bs)
-	if err != nil {
-		return nil, err
-	}
-
-	ipam_, err := processNetworks(parsed.Ipam6.Networks)
-	if err != nil {
-		return nil, err
-	}
-
-	ipam_.ResolveParents()
-
-	return ipam_, nil
-}
-
-type Ipam struct {
-	networks []*Network
-}
-
-func contains(a, b netip.Prefix) bool {
-	return b.Bits() > a.Bits() && b.Overlaps(a)
-}
-
-func (ipam *Ipam) ResolveParents() {
-	for _, n := range ipam.networks {
-		log.Printf("network %s/%s", n.name, n.prefix)
-		for _, p := range ipam.networks {
-			if n == p {
-				continue
-			}
-			log.Printf(" candidate %s/%s", p.name, p.prefix)
-			if contains(p.prefix, n.prefix) {
-				if n.parent == nil {
-					log.Printf(" found parent %s/%s", p.name, p.prefix)
-					n.parent = p
-				} else {
-					if n.parent.prefix.Bits() < p.prefix.Bits() {
-						log.Printf(" found better parent %s/%s", p.name, p.prefix)
-						n.parent = p
-					}
-				}
-			}
-		}
-	}
-
-	return
-}
-
-func (ipam *Ipam) FindRoots() []*Network {
-	var ns []*Network
-
-	for _, n := range ipam.networks {
-		if n.parent == nil {
-			ns = append(ns, n)
-		}
-	}
-
-	return ns
-}
-
-type Network struct {
-	name   string
-	parent *Network
-	prefix netip.Prefix
-	hosts  []networkHost
-}
-
-func CompareNetwork(a, b *Network) int {
-	return cmp.Compare(a.name, b.name)
-}
-
-func (n *Network) Compare(other *Network) int {
-	return cmp.Compare(n.name, other.name)
-}
-
-type networkHost struct {
-	name    string
-	address netip.Addr
-}
-
-func processNetworks(networks map[string]yaml_model.Network6Yaml) (*Ipam, error) {
-	var ns []*Network
-
-	for name, net := range networks {
-		log.Printf("Processing net %v\n", name)
-		prefix, err := netip.ParsePrefix(net.Range)
-		if err != nil {
-			return nil, fmt.Errorf("error parsing net range: %v", err)
-		}
-		log.Printf("prefix: %s", prefix.String())
-
-		n := Network{name: name, prefix: prefix}
-		for hostname, a := range net.Hosts {
-			addr, err := netip.ParseAddr(a)
-			if err != nil {
-				return nil, fmt.Errorf("network: %s, unable to parse host address %s", n.name, a)
-			}
-
-			n.hosts = append(n.hosts, networkHost{
-				name:    hostname,
-				address: addr,
-			})
-		}
-
-		ns = append(ns, &n)
-	}
-
-	return &Ipam{networks: ns}, nil
-}