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executor.go
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executor.go
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// Copyright 2018 Bull S.A.S. Atos Technologies - Bull, Rue Jean Jaures, B.P.68, 78340, Les Clayes-sous-Bois, France.
//
// 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 kubernetes
import (
"context"
"os"
"time"
"github.com/pkg/errors"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
// Loading the gcp plugin to authenticate against GKE clusters
_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
"github.com/ystia/yorc/v3/config"
"github.com/ystia/yorc/v3/helper/stringutil"
"github.com/ystia/yorc/v3/log"
"github.com/ystia/yorc/v3/prov"
)
type defaultExecutor struct {
clientset kubernetes.Interface
}
func getExecution(conf config.Configuration, taskID, deploymentID, nodeName string, operation prov.Operation) (*execution, error) {
consulClient, err := conf.GetConsulClient()
if err != nil {
return nil, err
}
kv := consulClient.KV()
return newExecution(kv, conf, taskID, deploymentID, nodeName, operation)
}
func (e *defaultExecutor) ExecAsyncOperation(ctx context.Context, conf config.Configuration, taskID, deploymentID, nodeName string, operation prov.Operation, stepName string) (*prov.Action, time.Duration, error) {
exec, err := getExecution(conf, taskID, deploymentID, nodeName, operation)
if err != nil {
return nil, 0, err
}
if e.clientset == nil {
e.clientset, err = initClientSet(conf)
if err != nil {
return nil, 0, err
}
}
return exec.executeAsync(ctx, conf, stepName, e.clientset)
}
func (e *defaultExecutor) ExecOperation(ctx context.Context, conf config.Configuration, taskID, deploymentID, nodeName string, operation prov.Operation) error {
exec, err := getExecution(conf, taskID, deploymentID, nodeName, operation)
if err != nil {
return err
}
if e.clientset == nil {
e.clientset, err = initClientSet(conf)
if err != nil {
return err
}
}
return exec.execute(ctx, e.clientset)
}
func initClientSet(cfg config.Configuration) (*kubernetes.Clientset, error) {
kubConf := cfg.Infrastructures["kubernetes"]
var conf *rest.Config
var err error
var kubeMasterIP string
var kubeConfigPathOrContent string
if kubConf != nil {
kubeMasterIP = kubConf.GetString("master_url")
kubeConfigPathOrContent = kubConf.GetString("kubeconfig")
}
if kubeConfigPathOrContent == "" && kubeMasterIP == "" {
// No details on the kubernetes cluster in orchestrator configuration.
// Considering this is a configuration where the orchestrator runs within
// the Kubernetes Cluster
log.Debugf("No Kubernetes cluster specified in configuration, attempting to authenticate inside the cluster")
conf, err = rest.InClusterConfig()
if err != nil {
return nil, errors.Wrap(err, "Failed to build kubernetes InClusterConfig")
}
} else {
// kubeconfig yorc infrastructure config parameter is either a path to a
// file or a string providing the Kubernetes configuration details.
// The kubernetes go API expects to get a file, creating it if necessary
var kubeConfigPath string
var wasPath bool
if kubeConfigPathOrContent != "" {
if kubeConfigPath, wasPath, err = stringutil.GetFilePath(kubeConfigPathOrContent); err != nil {
return nil, errors.Wrap(err, "Failed to get Kubernetes config file")
}
if !wasPath {
defer os.Remove(kubeConfigPath)
}
}
// Google Application credentials are needed when attempting to access
// Kubernetes Engine outside the Kubernetes cluster from a host where gcloud
// SDK is not installed.
// The application_credentials yorc infrastructure config parameter is
// either a path to a file or a string providing the credentials.
// Google API expects a path to a file to be provided in an environment
// variable GOOGLE_APPLICATION_CREDENTIALS.
// So creating a file if necessary
applicationCredsPathOrContent := kubConf.GetString("application_credentials")
if applicationCredsPathOrContent != "" {
applicationCredsPath, wasPath, err := stringutil.GetFilePath(applicationCredsPathOrContent)
if err != nil {
return nil, errors.Wrap(err, "Failed to get application credentials file")
}
if !wasPath {
defer os.Remove(applicationCredsPath)
}
os.Setenv("GOOGLE_APPLICATION_CREDENTIALS", applicationCredsPath)
defer os.Unsetenv("GOOGLE_APPLICATION_CREDENTIALS")
}
conf, err = clientcmd.BuildConfigFromFlags(kubeMasterIP, kubeConfigPath)
if err != nil {
return nil, errors.Wrap(err, "Failed to build kubernetes config")
}
if kubeConfigPath == "" {
conf.TLSClientConfig.Insecure = kubConf.GetBool("insecure")
conf.TLSClientConfig.CAFile = kubConf.GetString("ca_file")
conf.TLSClientConfig.CertFile = kubConf.GetString("cert_file")
conf.TLSClientConfig.KeyFile = kubConf.GetString("key_file")
} else if conf.AuthProvider != nil && conf.AuthProvider.Name == "gcp" {
// When application credentials are set, using these creds
// and not attempting to rely on the local host gcloud command to
// access tokens, as gcloud may not be installed on yorc host
delete(conf.AuthProvider.Config, "cmd-path")
}
}
clientset, err := kubernetes.NewForConfig(conf)
return clientset, errors.Wrap(err, "Failed to create kubernetes clientset from config")
}