/
kubelet_client.go
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/
kubelet_client.go
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/*
Copyright 2014 The Kubernetes Authors.
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 client
import (
"context"
"fmt"
"net/http"
"strconv"
"time"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
utilnet "k8s.io/apimachinery/pkg/util/net"
"k8s.io/apiserver/pkg/server/egressselector"
restclient "k8s.io/client-go/rest"
"k8s.io/client-go/transport"
nodeutil "k8s.io/kubernetes/pkg/util/node"
)
// KubeletClientConfig defines config parameters for the kubelet client
type KubeletClientConfig struct {
// Port specifies the default port - used if no information about Kubelet port can be found in Node.NodeStatus.DaemonEndpoints.
Port uint
// ReadOnlyPort specifies the Port for ReadOnly communications.
ReadOnlyPort uint
// PreferredAddressTypes - used to select an address from Node.NodeStatus.Addresses
PreferredAddressTypes []string
// TLSClientConfig contains settings to enable transport layer security
restclient.TLSClientConfig
// Server requires Bearer authentication
BearerToken string `datapolicy:"token"`
// HTTPTimeout is used by the client to timeout http requests to Kubelet.
HTTPTimeout time.Duration
// Dial is a custom dialer used for the client
Dial utilnet.DialFunc
// Lookup will give us a dialer if the egress selector is configured for it
Lookup egressselector.Lookup
}
// ConnectionInfo provides the information needed to connect to a kubelet
type ConnectionInfo struct {
Scheme string
Hostname string
Port string
Transport http.RoundTripper
InsecureSkipTLSVerifyTransport http.RoundTripper
}
// ConnectionInfoGetter provides ConnectionInfo for the kubelet running on a named node
type ConnectionInfoGetter interface {
GetConnectionInfo(ctx context.Context, nodeName types.NodeName) (*ConnectionInfo, error)
}
// MakeTransport creates a secure RoundTripper for HTTP Transport.
func MakeTransport(config *KubeletClientConfig) (http.RoundTripper, error) {
return makeTransport(config, false)
}
// MakeInsecureTransport creates an insecure RoundTripper for HTTP Transport.
func MakeInsecureTransport(config *KubeletClientConfig) (http.RoundTripper, error) {
return makeTransport(config, true)
}
// makeTransport creates a RoundTripper for HTTP Transport.
func makeTransport(config *KubeletClientConfig, insecureSkipTLSVerify bool) (http.RoundTripper, error) {
// do the insecureSkipTLSVerify on the pre-transport *before* we go get a potentially cached connection.
// transportConfig always produces a new struct pointer.
preTLSConfig := config.transportConfig()
if insecureSkipTLSVerify && preTLSConfig != nil {
preTLSConfig.TLS.Insecure = true
preTLSConfig.TLS.CAData = nil
preTLSConfig.TLS.CAFile = ""
}
tlsConfig, err := transport.TLSConfigFor(preTLSConfig)
if err != nil {
return nil, err
}
rt := http.DefaultTransport
dialer := config.Dial
if dialer == nil && config.Lookup != nil {
// Assuming EgressSelector if SSHTunnel is not turned on.
// We will not get a dialer if egress selector is disabled.
networkContext := egressselector.Cluster.AsNetworkContext()
dialer, err = config.Lookup(networkContext)
if err != nil {
return nil, fmt.Errorf("failed to get context dialer for 'cluster': got %v", err)
}
}
if dialer != nil || tlsConfig != nil {
// If SSH Tunnel is turned on
rt = utilnet.SetOldTransportDefaults(&http.Transport{
DialContext: dialer,
TLSClientConfig: tlsConfig,
})
}
return transport.HTTPWrappersForConfig(config.transportConfig(), rt)
}
// transportConfig converts a client config to an appropriate transport config.
func (c *KubeletClientConfig) transportConfig() *transport.Config {
cfg := &transport.Config{
TLS: transport.TLSConfig{
CAFile: c.CAFile,
CAData: c.CAData,
CertFile: c.CertFile,
CertData: c.CertData,
KeyFile: c.KeyFile,
KeyData: c.KeyData,
NextProtos: c.NextProtos,
},
BearerToken: c.BearerToken,
}
if !cfg.HasCA() {
cfg.TLS.Insecure = true
}
return cfg
}
// NodeGetter defines an interface for looking up a node by name
type NodeGetter interface {
Get(ctx context.Context, name string, options metav1.GetOptions) (*v1.Node, error)
}
// NodeGetterFunc allows implementing NodeGetter with a function
type NodeGetterFunc func(ctx context.Context, name string, options metav1.GetOptions) (*v1.Node, error)
// Get fetches information via NodeGetterFunc.
func (f NodeGetterFunc) Get(ctx context.Context, name string, options metav1.GetOptions) (*v1.Node, error) {
return f(ctx, name, options)
}
// NodeConnectionInfoGetter obtains connection info from the status of a Node API object
type NodeConnectionInfoGetter struct {
// nodes is used to look up Node objects
nodes NodeGetter
// scheme is the scheme to use to connect to all kubelets
scheme string
// defaultPort is the port to use if no Kubelet endpoint port is recorded in the node status
defaultPort int
// transport is the transport to use to send a request to all kubelets
transport http.RoundTripper
// insecureSkipTLSVerifyTransport is the transport to use if the kube-apiserver wants to skip verifying the TLS certificate of the kubelet
insecureSkipTLSVerifyTransport http.RoundTripper
// preferredAddressTypes specifies the preferred order to use to find a node address
preferredAddressTypes []v1.NodeAddressType
}
// NewNodeConnectionInfoGetter creates a new NodeConnectionInfoGetter.
func NewNodeConnectionInfoGetter(nodes NodeGetter, config KubeletClientConfig) (ConnectionInfoGetter, error) {
transport, err := MakeTransport(&config)
if err != nil {
return nil, err
}
insecureSkipTLSVerifyTransport, err := MakeInsecureTransport(&config)
if err != nil {
return nil, err
}
types := []v1.NodeAddressType{}
for _, t := range config.PreferredAddressTypes {
types = append(types, v1.NodeAddressType(t))
}
return &NodeConnectionInfoGetter{
nodes: nodes,
scheme: "https",
defaultPort: int(config.Port),
transport: transport,
insecureSkipTLSVerifyTransport: insecureSkipTLSVerifyTransport,
preferredAddressTypes: types,
}, nil
}
// GetConnectionInfo retrieves connection info from the status of a Node API object.
func (k *NodeConnectionInfoGetter) GetConnectionInfo(ctx context.Context, nodeName types.NodeName) (*ConnectionInfo, error) {
node, err := k.nodes.Get(ctx, string(nodeName), metav1.GetOptions{})
if err != nil {
return nil, err
}
// Find a kubelet-reported address, using preferred address type
host, err := nodeutil.GetPreferredNodeAddress(node, k.preferredAddressTypes)
if err != nil {
return nil, err
}
// Use the kubelet-reported port, if present
port := int(node.Status.DaemonEndpoints.KubeletEndpoint.Port)
if port <= 0 {
port = k.defaultPort
}
return &ConnectionInfo{
Scheme: k.scheme,
Hostname: host,
Port: strconv.Itoa(port),
Transport: k.transport,
InsecureSkipTLSVerifyTransport: k.insecureSkipTLSVerifyTransport,
}, nil
}