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controller.go
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controller.go
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// Copyright (c) 2017 Northwestern Mutual.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package controller
import (
"errors"
"k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
"k8s.io/kubernetes/pkg/client/restclient"
"k8s.io/kubernetes/pkg/kubectl/cmd/util"
)
// Controller is an exported struct
// that holds all of the information
// we will need throughout our program
// to talk to the kubernetes api server.
// this includes a rest client and well
// a clientset that gives us access to the libs
type Controller struct {
RestClient *restclient.RESTClient
ClientSet internalclientset.Interface
MasterHost string
}
// New creates a new kubernetes controller
// the controller is secure and uses the
// cluster's kubeconfig file to construct
// permissions
func New() (*Controller, error) {
f := util.NewFactory(nil)
// ClientSet gives you back an internal, generated clientset
clientSet, err := f.ClientSet()
if err != nil {
return nil, err
}
// Returns a RESTClient for accessing Kubernetes resources or an error.
restClient, err := f.RESTClient()
if err != nil {
return nil, err
}
controller := &Controller{
RestClient: restClient,
ClientSet: clientSet,
}
// Returns a client.Config for accessing the Kubernetes server.
k8sConfig, err := f.ClientConfig()
if err != nil {
return nil, err
} else if k8sConfig == nil {
return nil, errors.New("received nil k8sConfig, please check if k8s cluster is available")
} else {
controller.MasterHost = k8sConfig.Host
}
// return our newly created controller
return controller, nil
}