/
incluster.go
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/
incluster.go
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// Copyright 2018 Istio 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 registry
import (
"fmt"
"io/ioutil"
"os"
"strings"
"text/template"
"istio.io/istio/pkg/test/kube"
multierror "github.com/hashicorp/go-multierror"
)
const (
// Default values for test env setup
kubeRegistry = "kube-registry"
kubeRegistryProxy = "kube-registry-proxy"
labelKey = "k8s-app"
)
// NewInClusterRegistry creates a new in-cluster registry object.
func NewInClusterRegistry(accessor *kube.Accessor, localPort uint16, ns string) (*InClusterRegistry, error) {
return &InClusterRegistry{
accessor: accessor,
localRegistryPort: localPort,
namespace: ns,
}, nil
}
// InClusterRegistry helps deploying an in-cluster registry on a k8s cluster.
type InClusterRegistry struct {
accessor *kube.Accessor
forwarder kube.PortForwarder
localRegistryAddress string
localRegistryPort uint16
namespace string
}
func writeTemplate(tmpl *template.Template, data interface{}, dst string) error {
f, err := os.Create(dst)
defer func() { _ = f.Close() }()
if err != nil {
return err
}
if err := tmpl.Execute(f, data); err != nil {
return err
}
return nil
}
func writeTemplateInTempfile(tmpl *template.Template, data interface{}) (string, error) {
dst, err := ioutil.TempFile("", "in_cluster_registry")
if err != nil {
return "", err
}
return dst.Name(), writeTemplate(tmpl, data, dst.Name())
}
// Start sets up registry and returns if any error was found while doing that.
func (r *InClusterRegistry) Start() error {
if err := r.accessor.CreateNamespace(r.namespace, "", false); err != nil {
if !strings.Contains(err.Error(), "already exist") {
return err
}
}
registryTemplate, err := getRegistryYAMLTemplate()
if err != nil {
return err
}
registryFile, err := writeTemplateInTempfile(
registryTemplate,
registryOptions{Namespace: r.namespace, Port: r.localRegistryPort})
if err != nil {
return err
}
if err := r.accessor.Apply(r.namespace, registryFile); err != nil {
return err
}
if err := r.accessor.WaitUntilDeploymentIsReady(r.namespace, kubeRegistry); err != nil {
return err
}
if err := r.accessor.WaitUntilDaemonSetIsReady(r.namespace, kubeRegistryProxy); err != nil {
return err
}
registryPod, err := r.accessor.FindPodBySelectors(r.namespace,
fmt.Sprintf("%s=%s", labelKey, kubeRegistry))
if err != nil {
return err
}
// Registry is up now, try to get the registry pod for port-forwarding
options := &kube.PodSelectOptions{
PodNamespace: r.namespace,
PodName: registryPod.Name,
}
forwarder, err := r.accessor.NewPortForwarder(options, r.localRegistryPort, r.localRegistryPort)
if err != nil {
return err
}
if err := forwarder.Start(); err != nil {
return err
}
r.forwarder = forwarder
r.localRegistryAddress = forwarder.Address()
return nil
}
// Address returns the local registry address after a successful call to Start().
func (r *InClusterRegistry) Address() string {
return r.localRegistryAddress
}
// Close deletes local registry from k8s cluster and cleans-up port forward processes too.
func (r *InClusterRegistry) Close() error {
var errors error
if err := r.accessor.DeleteNamespace(r.namespace); err != nil {
errors = multierror.Append(errors, err)
}
if err := r.accessor.WaitForNamespaceDeletion(r.namespace); err != nil {
errors = multierror.Append(errors, err)
}
if r.forwarder != nil {
r.forwarder.Close()
}
return errors
}