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node.go
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node.go
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// Copyright 2016-2017 Authors of Cilium
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package node
import (
"net"
"k8s.io/client-go/pkg/api/v1"
)
// Identity represents the node identity of a node.
type Identity struct {
Name string
}
// String returns the string representation on NodeIdentity.
func (nn Identity) String() string {
return nn.Name
}
// Node contains the nodes name, the list of addresses to this address
type Node struct {
Name string
IPAddresses []Address
// IPv4AllocCIDR if set, is the IPv4 address pool out of which the node
// allocates IPs for local endpoints from
IPv4AllocCIDR *net.IPNet
// IPv6AllocCIDR if set, is the IPv6 address pool out of which the node
// allocates IPs for local endpoints from
IPv6AllocCIDR *net.IPNet
}
// Address is a node address which contains an IP and the address type.
type Address struct {
AddressType v1.NodeAddressType
IP net.IP
}
// GetNodeIP returns one of the node's IP addresses available with the
// following priority:
// - NodeInternalIP
// - NodeExternalIP
// - other IP address type
func (n *Node) GetNodeIP(ipv6 bool) net.IP {
var backupIP net.IP
for _, addr := range n.IPAddresses {
if (ipv6 && addr.IP.To4() != nil) ||
(!ipv6 && addr.IP.To4() == nil) {
continue
}
switch addr.AddressType {
// Always prefer a cluster internal IP
case v1.NodeInternalIP:
return addr.IP
case v1.NodeExternalIP:
// Fall back to external Node IP
// if no internal IP could be found
backupIP = addr.IP
default:
// As a last resort, if no internal or external
// IP was found, use any node address available
if backupIP == nil {
backupIP = addr.IP
}
}
}
return backupIP
}