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store.go
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store.go
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/*
Copyright 2017 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 source
import (
"errors"
"net/http"
"os"
"strings"
"time"
"sync"
"github.com/linki/instrumented_http"
log "github.com/sirupsen/logrus"
istiocrd "istio.io/istio/pilot/pkg/config/kube/crd"
istiomodel "istio.io/istio/pilot/pkg/model"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
)
// ErrSourceNotFound is returned when a requested source doesn't exist.
var ErrSourceNotFound = errors.New("source not found")
// Config holds shared configuration options for all Sources.
type Config struct {
Namespace string
AnnotationFilter string
FQDNTemplate string
CombineFQDNAndAnnotation bool
Compatibility string
PublishInternal bool
PublishHostIP bool
ConnectorServer string
CRDSourceAPIVersion string
CRDSourceKind string
KubeConfig string
KubeMaster string
ServiceTypeFilter []string
IstioIngressGateway string
}
// ClientGenerator provides clients
type ClientGenerator interface {
KubeClient() (kubernetes.Interface, error)
IstioClient() (istiomodel.ConfigStore, error)
}
// SingletonClientGenerator stores provider clients and guarantees that only one instance of client
// will be generated
type SingletonClientGenerator struct {
KubeConfig string
KubeMaster string
RequestTimeout time.Duration
kubeClient kubernetes.Interface
istioClient istiomodel.ConfigStore
kubeOnce sync.Once
istioOnce sync.Once
}
// KubeClient generates a kube client if it was not created before
func (p *SingletonClientGenerator) KubeClient() (kubernetes.Interface, error) {
var err error
p.kubeOnce.Do(func() {
p.kubeClient, err = NewKubeClient(p.KubeConfig, p.KubeMaster, p.RequestTimeout)
})
return p.kubeClient, err
}
// IstioClient generates an istio client if it was not created before
func (p *SingletonClientGenerator) IstioClient() (istiomodel.ConfigStore, error) {
var err error
p.istioOnce.Do(func() {
p.istioClient, err = NewIstioClient(p.KubeConfig)
})
return p.istioClient, err
}
// ByNames returns multiple Sources given multiple names.
func ByNames(p ClientGenerator, names []string, cfg *Config) ([]Source, error) {
sources := []Source{}
for _, name := range names {
source, err := BuildWithConfig(name, p, cfg)
if err != nil {
return nil, err
}
sources = append(sources, source)
}
return sources, nil
}
// BuildWithConfig allows to generate a Source implementation from the shared config
func BuildWithConfig(source string, p ClientGenerator, cfg *Config) (Source, error) {
switch source {
case "service":
client, err := p.KubeClient()
if err != nil {
return nil, err
}
return NewServiceSource(client, cfg.Namespace, cfg.AnnotationFilter, cfg.FQDNTemplate, cfg.CombineFQDNAndAnnotation, cfg.Compatibility, cfg.PublishInternal, cfg.PublishHostIP, cfg.ServiceTypeFilter)
case "ingress":
client, err := p.KubeClient()
if err != nil {
return nil, err
}
return NewIngressSource(client, cfg.Namespace, cfg.AnnotationFilter, cfg.FQDNTemplate, cfg.CombineFQDNAndAnnotation)
case "istio-gateway":
kubernetesClient, err := p.KubeClient()
if err != nil {
return nil, err
}
istioClient, err := p.IstioClient()
if err != nil {
return nil, err
}
return NewIstioGatewaySource(kubernetesClient, istioClient, cfg.IstioIngressGateway, cfg.Namespace, cfg.AnnotationFilter, cfg.FQDNTemplate, cfg.CombineFQDNAndAnnotation)
case "fake":
return NewFakeSource(cfg.FQDNTemplate)
case "connector":
return NewConnectorSource(cfg.ConnectorServer)
case "crd":
client, err := p.KubeClient()
if err != nil {
return nil, err
}
crdClient, scheme, err := NewCRDClientForAPIVersionKind(client, cfg.KubeConfig, cfg.KubeMaster, cfg.CRDSourceAPIVersion, cfg.CRDSourceKind)
if err != nil {
return nil, err
}
return NewCRDSource(crdClient, cfg.Namespace, cfg.CRDSourceKind, scheme)
}
return nil, ErrSourceNotFound
}
// NewKubeClient returns a new Kubernetes client object. It takes a Config and
// uses KubeMaster and KubeConfig attributes to connect to the cluster. If
// KubeConfig isn't provided it defaults to using the recommended default.
func NewKubeClient(kubeConfig, kubeMaster string, requestTimeout time.Duration) (*kubernetes.Clientset, error) {
if kubeConfig == "" {
if _, err := os.Stat(clientcmd.RecommendedHomeFile); err == nil {
kubeConfig = clientcmd.RecommendedHomeFile
}
}
config, err := clientcmd.BuildConfigFromFlags(kubeMaster, kubeConfig)
if err != nil {
return nil, err
}
config.WrapTransport = func(rt http.RoundTripper) http.RoundTripper {
return instrumented_http.NewTransport(rt, &instrumented_http.Callbacks{
PathProcessor: func(path string) string {
parts := strings.Split(path, "/")
return parts[len(parts)-1]
},
})
}
config.Timeout = requestTimeout
client, err := kubernetes.NewForConfig(config)
if err != nil {
return nil, err
}
log.Infof("Created Kubernetes client %s", config.Host)
return client, nil
}
// NewIstioClient returns a new Istio client object. It uses the configured
// KubeConfig attribute to connect to the cluster. If KubeConfig isn't provided
// it defaults to using the recommended default.
// NB: Istio controls the creation of the underlying Kubernetes client, so we
// have no ability to tack on transport wrappers (e.g., Prometheus request
// wrappers) to the client's config at this level. Furthermore, the Istio client
// constructor does not expose the ability to override the Kubernetes master,
// so the Master config attribute has no effect.
func NewIstioClient(kubeConfig string) (*istiocrd.Client, error) {
if kubeConfig == "" {
if _, err := os.Stat(clientcmd.RecommendedHomeFile); err == nil {
kubeConfig = clientcmd.RecommendedHomeFile
}
}
client, err := istiocrd.NewClient(
kubeConfig,
"",
istiomodel.ConfigDescriptor{istiomodel.Gateway},
"",
)
if err != nil {
return nil, err
}
log.Info("Created Istio client")
return client, nil
}