mirror of
https://github.com/kubernetes-sigs/external-dns.git
synced 2025-08-06 09:36:58 +02:00
135 lines
3.6 KiB
Go
135 lines
3.6 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package source
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import (
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"errors"
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"net/http"
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"os"
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"strings"
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"sync"
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"github.com/linki/instrumented_http"
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log "github.com/sirupsen/logrus"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/tools/clientcmd"
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)
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// ErrSourceNotFound is returned when a requested source doesn't exist.
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var ErrSourceNotFound = errors.New("source not found")
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// Config holds shared configuration options for all Sources.
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type Config struct {
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Namespace string
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FQDNTemplate string
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Compatibility string
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PublishInternal bool
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}
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// ClientGenerator provides clients
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type ClientGenerator interface {
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KubeClient() (kubernetes.Interface, error)
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}
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// SingletonClientGenerator stores provider clients and guarantees that only one instance of client
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// will be generated
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type SingletonClientGenerator struct {
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KubeConfig string
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KubeMaster string
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client kubernetes.Interface
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sync.Once
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}
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// KubeClient generates a kube client if it was not created before
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func (p *SingletonClientGenerator) KubeClient() (kubernetes.Interface, error) {
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var err error
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p.Once.Do(func() {
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p.client, err = NewKubeClient(p.KubeConfig, p.KubeMaster)
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})
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return p.client, err
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}
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// ByNames returns multiple Sources given multiple names.
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func ByNames(p ClientGenerator, names []string, cfg *Config) ([]Source, error) {
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sources := []Source{}
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for _, name := range names {
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source, err := BuildWithConfig(name, p, cfg)
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if err != nil {
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return nil, err
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}
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sources = append(sources, source)
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}
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return sources, nil
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}
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// BuildWithConfig allows to generate a Source implementation from the shared config
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func BuildWithConfig(source string, p ClientGenerator, cfg *Config) (Source, error) {
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switch source {
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case "service":
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client, err := p.KubeClient()
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if err != nil {
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return nil, err
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}
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return NewServiceSource(client, cfg.Namespace, cfg.FQDNTemplate, cfg.Compatibility, cfg.PublishInternal)
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case "ingress":
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client, err := p.KubeClient()
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if err != nil {
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return nil, err
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}
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return NewIngressSource(client, cfg.Namespace, cfg.FQDNTemplate)
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case "fake":
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return NewFakeSource(cfg.FQDNTemplate)
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}
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return nil, ErrSourceNotFound
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}
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// NewKubeClient returns a new Kubernetes client object. It takes a Config and
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// uses KubeMaster and KubeConfig attributes to connect to the cluster. If
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// KubeConfig isn't provided it defaults to using the recommended default.
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func NewKubeClient(kubeConfig, kubeMaster string) (*kubernetes.Clientset, error) {
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if kubeConfig == "" {
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if _, err := os.Stat(clientcmd.RecommendedHomeFile); err == nil {
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kubeConfig = clientcmd.RecommendedHomeFile
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}
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}
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config, err := clientcmd.BuildConfigFromFlags(kubeMaster, kubeConfig)
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if err != nil {
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return nil, err
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}
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config.WrapTransport = func(rt http.RoundTripper) http.RoundTripper {
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return instrumented_http.NewTransport(rt, &instrumented_http.Callbacks{
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PathProcessor: func(path string) string {
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parts := strings.Split(path, "/")
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return parts[len(parts)-1]
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},
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})
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}
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client, err := kubernetes.NewForConfig(config)
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if err != nil {
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return nil, err
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}
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log.Infof("Connected to cluster at %s", config.Host)
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return client, nil
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}
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