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apiserver.go
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apiserver.go
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// Copyright 2020 Antrea 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 apiserver
import (
"fmt"
"net"
"os"
"path"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/runtime/serializer"
k8sversion "k8s.io/apimachinery/pkg/version"
genericapiserver "k8s.io/apiserver/pkg/server"
genericoptions "k8s.io/apiserver/pkg/server/options"
systeminstall "antrea.io/antrea/pkg/apis/system/install"
"antrea.io/antrea/pkg/apiserver/handlers/loglevel"
"antrea.io/antrea/pkg/flowaggregator/apiserver/handlers/flowrecords"
"antrea.io/antrea/pkg/flowaggregator/apiserver/handlers/recordmetrics"
"antrea.io/antrea/pkg/flowaggregator/querier"
antreaversion "antrea.io/antrea/pkg/version"
)
const (
Name = "flow-aggregator-api"
// authenticationTimeout specifies a time limit for requests made by the authorization webhook client
// The default value (10 seconds) is not long enough as defined in
// https://pkg.go.dev/k8s.io/apiserver@v0.21.0/pkg/server/options#NewDelegatingAuthenticationOptions
// A value of zero means no timeout.
authenticationTimeout = 0
)
var (
// Scheme defines methods for serializing and deserializing API objects.
scheme = runtime.NewScheme()
// Codecs provides methods for retrieving codecs and serializers for specific
// versions and content types.
codecs = serializer.NewCodecFactory(scheme)
// #nosec G101: false positive triggered by variable name which includes "token"
TokenPath = "/var/run/antrea/apiserver/loopback-client-token"
)
func init() {
systeminstall.Install(scheme)
metav1.AddToGroupVersion(scheme, schema.GroupVersion{Version: "v1"})
}
type flowAggregatorAPIServer struct {
GenericAPIServer *genericapiserver.GenericAPIServer
}
func (s *flowAggregatorAPIServer) Run(stopCh <-chan struct{}) error {
return s.GenericAPIServer.PrepareRun().Run(stopCh)
}
func installHandlers(s *genericapiserver.GenericAPIServer, faq querier.FlowAggregatorQuerier) {
s.Handler.NonGoRestfulMux.HandleFunc("/flowrecords", flowrecords.HandleFunc(faq))
s.Handler.NonGoRestfulMux.HandleFunc("/recordmetrics", recordmetrics.HandleFunc(faq))
s.Handler.NonGoRestfulMux.HandleFunc("/loglevel", loglevel.HandleFunc())
}
// New creates an APIServer for running in flow aggregator.
func New(faq querier.FlowAggregatorQuerier, bindPort int, cipherSuites []uint16, tlsMinVersion uint16) (*flowAggregatorAPIServer, error) {
cfg, err := newConfig(bindPort)
if err != nil {
return nil, err
}
s, err := cfg.New(Name, genericapiserver.NewEmptyDelegate())
if err != nil {
return nil, err
}
s.SecureServingInfo.CipherSuites = cipherSuites
s.SecureServingInfo.MinTLSVersion = tlsMinVersion
installHandlers(s, faq)
return &flowAggregatorAPIServer{GenericAPIServer: s}, nil
}
func newConfig(bindPort int) (*genericapiserver.CompletedConfig, error) {
secureServing := genericoptions.NewSecureServingOptions().WithLoopback()
authentication := genericoptions.NewDelegatingAuthenticationOptions()
authorization := genericoptions.NewDelegatingAuthorizationOptions().WithAlwaysAllowPaths("/healthz", "/livez", "/readyz")
// Set the PairName but leave certificate directory blank to generate in-memory by default.
secureServing.ServerCert.CertDirectory = ""
secureServing.ServerCert.PairName = Name
secureServing.BindAddress = net.IPv4zero
secureServing.BindPort = bindPort
authentication.WithRequestTimeout(authenticationTimeout)
if err := secureServing.MaybeDefaultWithSelfSignedCerts("localhost", nil, []net.IP{net.ParseIP("127.0.0.1"), net.IPv6loopback}); err != nil {
return nil, fmt.Errorf("error creating self-signed certificates: %v", err)
}
serverConfig := genericapiserver.NewConfig(codecs)
if err := secureServing.ApplyTo(&serverConfig.SecureServing, &serverConfig.LoopbackClientConfig); err != nil {
return nil, err
}
if err := authentication.ApplyTo(&serverConfig.Authentication, serverConfig.SecureServing, nil); err != nil {
return nil, err
}
if err := authorization.ApplyTo(&serverConfig.Authorization); err != nil {
return nil, err
}
if err := os.MkdirAll(path.Dir(TokenPath), os.ModeDir); err != nil {
return nil, fmt.Errorf("error when creating dirs of token file: %v", err)
}
if err := os.WriteFile(TokenPath, []byte(serverConfig.LoopbackClientConfig.BearerToken), 0600); err != nil {
return nil, fmt.Errorf("error when writing loopback access token to file: %v", err)
}
v := antreaversion.GetVersion()
serverConfig.Version = &k8sversion.Info{
Major: fmt.Sprint(v.Major),
Minor: fmt.Sprint(v.Minor),
GitVersion: v.String(),
GitTreeState: antreaversion.GitTreeState,
GitCommit: antreaversion.GetGitSHA(),
}
completedServerCfg := serverConfig.Complete(nil)
return &completedServerCfg, nil
}