k8s.io/kubernetes@v1.31.0-alpha.0.0.20240520171757-56147500dadc/pkg/proxy/node.go (about)

     1  /*
     2  Copyright 2022 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package proxy
    18  
    19  import (
    20  	"context"
    21  	"reflect"
    22  	"sync"
    23  
    24  	v1 "k8s.io/api/core/v1"
    25  	"k8s.io/klog/v2"
    26  	"k8s.io/kubernetes/pkg/proxy/config"
    27  	"k8s.io/kubernetes/pkg/proxy/healthcheck"
    28  )
    29  
    30  // NodePodCIDRHandler handles the life cycle of kube-proxy based on the node PodCIDR assigned
    31  // Implements the config.NodeHandler interface
    32  // https://issues.k8s.io/111321
    33  type NodePodCIDRHandler struct {
    34  	mu       sync.Mutex
    35  	podCIDRs []string
    36  	logger   klog.Logger
    37  }
    38  
    39  func NewNodePodCIDRHandler(ctx context.Context, podCIDRs []string) *NodePodCIDRHandler {
    40  	return &NodePodCIDRHandler{
    41  		podCIDRs: podCIDRs,
    42  		logger:   klog.FromContext(ctx),
    43  	}
    44  }
    45  
    46  var _ config.NodeHandler = &NodePodCIDRHandler{}
    47  
    48  // OnNodeAdd is a handler for Node creates.
    49  func (n *NodePodCIDRHandler) OnNodeAdd(node *v1.Node) {
    50  	n.mu.Lock()
    51  	defer n.mu.Unlock()
    52  
    53  	podCIDRs := node.Spec.PodCIDRs
    54  	// initialize podCIDRs
    55  	if len(n.podCIDRs) == 0 && len(podCIDRs) > 0 {
    56  		n.logger.Info("Setting current PodCIDRs", "podCIDRs", podCIDRs)
    57  		n.podCIDRs = podCIDRs
    58  		return
    59  	}
    60  	if !reflect.DeepEqual(n.podCIDRs, podCIDRs) {
    61  		n.logger.Error(nil, "Using NodeCIDR LocalDetector mode, current PodCIDRs are different than previous PodCIDRs, restarting",
    62  			"node", klog.KObj(node), "newPodCIDRs", podCIDRs, "oldPodCIDRs", n.podCIDRs)
    63  		klog.FlushAndExit(klog.ExitFlushTimeout, 1)
    64  	}
    65  }
    66  
    67  // OnNodeUpdate is a handler for Node updates.
    68  func (n *NodePodCIDRHandler) OnNodeUpdate(_, node *v1.Node) {
    69  	n.mu.Lock()
    70  	defer n.mu.Unlock()
    71  	podCIDRs := node.Spec.PodCIDRs
    72  	// initialize podCIDRs
    73  	if len(n.podCIDRs) == 0 && len(podCIDRs) > 0 {
    74  		n.logger.Info("Setting current PodCIDRs", "podCIDRs", podCIDRs)
    75  		n.podCIDRs = podCIDRs
    76  		return
    77  	}
    78  	if !reflect.DeepEqual(n.podCIDRs, podCIDRs) {
    79  		n.logger.Error(nil, "Using NodeCIDR LocalDetector mode, current PodCIDRs are different than previous PodCIDRs, restarting",
    80  			"node", klog.KObj(node), "newPodCIDRs", podCIDRs, "oldPODCIDRs", n.podCIDRs)
    81  		klog.FlushAndExit(klog.ExitFlushTimeout, 1)
    82  	}
    83  }
    84  
    85  // OnNodeDelete is a handler for Node deletes.
    86  func (n *NodePodCIDRHandler) OnNodeDelete(node *v1.Node) {
    87  	n.logger.Error(nil, "Current Node is being deleted", "node", klog.KObj(node))
    88  }
    89  
    90  // OnNodeSynced is a handler for Node syncs.
    91  func (n *NodePodCIDRHandler) OnNodeSynced() {}
    92  
    93  // NodeEligibleHandler handles the life cycle of the Node's eligibility, as
    94  // determined by the health server for directing load balancer traffic.
    95  type NodeEligibleHandler struct {
    96  	HealthServer *healthcheck.ProxierHealthServer
    97  }
    98  
    99  var _ config.NodeHandler = &NodeEligibleHandler{}
   100  
   101  // OnNodeAdd is a handler for Node creates.
   102  func (n *NodeEligibleHandler) OnNodeAdd(node *v1.Node) { n.HealthServer.SyncNode(node) }
   103  
   104  // OnNodeUpdate is a handler for Node updates.
   105  func (n *NodeEligibleHandler) OnNodeUpdate(_, node *v1.Node) { n.HealthServer.SyncNode(node) }
   106  
   107  // OnNodeDelete is a handler for Node deletes.
   108  func (n *NodeEligibleHandler) OnNodeDelete(node *v1.Node) { n.HealthServer.SyncNode(node) }
   109  
   110  // OnNodeSynced is a handler for Node syncs.
   111  func (n *NodeEligibleHandler) OnNodeSynced() {}