Enable retrieving existing Prefix CIDRs from the Ipamer

ipam.go

@@ -32,6 +32,8 @@ type Ipamer interface {
 	// PrefixesOverlapping will check if one ore more prefix of newPrefixes is overlapping
 	// with one of existingPrefixes
 	PrefixesOverlapping(existingPrefixes []string, newPrefixes []string) error
+	// ReadAllPrefixCidrs retrieves all existing Prefix CIDRs from the underlying storage
+	ReadAllPrefixCidrs() ([]string, error)
 }
 
 type ipamer struct {

prefix.go

@@ -484,6 +484,11 @@ func (i *ipamer) newPrefix(cidr, parentCidr string) (*Prefix, error) {
 	return p, nil
 }
 
+// ReadAllPrefixCidrs retrieves all existing Prefix CIDRs from the underlying storage
+func (i *ipamer) ReadAllPrefixCidrs() ([]string, error) {
+	return i.storage.ReadAllPrefixCidrs()
+}
+
 func (p *Prefix) String() string {
 	return p.Cidr
 }

prefix_test.go

@@ -1456,3 +1456,20 @@ func TestAcquireIPParallel(t *testing.T) {
 		}
 	})
 }
+
+func TestIpamer_ReadAllPrefixCidrs(t *testing.T) {
+
+	testWithBackends(t, func(t *testing.T, ipam *ipamer) {
+		const cidr = "192.168.0.0/20"
+
+		prefix, err := ipam.NewPrefix(cidr)
+		require.Nil(t, err)
+		require.NotNil(t, prefix)
+
+		cidrs, err := ipam.ReadAllPrefixCidrs()
+		require.Nil(t, err)
+		require.NotNil(t, cidrs)
+		require.Equal(t, 1, len(cidrs))
+		require.Equal(t, cidr, cidrs[0])
+	})
+}