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/*
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.
*/
// Based on Code: https://github.com/johandry/klient
package client
import (
"bytes"
"fmt"
"io"
v1 "k8s.io/api/core/v1"
"k8s.io/cli-runtime/pkg/resource"
"k8s.io/client-go/kubernetes"
"k8s.io/kubectl/pkg/validation"
)
// DefaultValidation default action to validate. If `true` all resources by
// default will be validated.
const DefaultValidation = false
// Client is a kubernetes client, like `kubectl`
type Client struct {
Clientset *kubernetes.Clientset
factory *factory
validator validation.Schema
namespace string
enforceNamespace bool
forceConflicts bool
ServerSideApply bool
}
// Result is an alias for the Kubernetes CLI runtime resource.Result
type Result = resource.Result
// BuilderOptions parameters to create a Resource Builder
type BuilderOptions struct {
Unstructured bool
Validate bool
Namespace string
LabelSelector string
FieldSelector string
All bool
AllNamespaces bool
}
// NewBuilderOptions creates a BuilderOptions with the default values for
// the parameters to create a Resource Builder
func NewBuilderOptions() *BuilderOptions {
return &BuilderOptions{
Unstructured: true,
Validate: true,
}
}
// NewE creates a kubernetes client, returns an error if fail
func NewE(context, kubeconfig string, ns string) (*Client, error) {
var namespace string
var enforceNamespace bool
var err error
factory := newFactory(context, kubeconfig)
// If `true` it will always validate the given objects/resources
// Unless something different is specified in the NewBuilderOptions
validator, _ := factory.Validator(DefaultValidation)
if ns == "" {
namespace, enforceNamespace, err = factory.ToRawKubeConfigLoader().Namespace()
if err != nil {
namespace = v1.NamespaceDefault
enforceNamespace = true
}
} else {
namespace = ns
enforceNamespace = false
}
clientset, err := factory.KubernetesClientSet()
if err != nil {
return nil, err
}
if clientset == nil {
return nil, fmt.Errorf("cannot create a clientset from given context and kubeconfig")
}
return &Client{
factory: factory,
Clientset: clientset,
validator: validator,
namespace: namespace,
enforceNamespace: enforceNamespace,
}, nil
}
// New creates a kubernetes client
func New(context, kubeconfig string, namespace string) *Client {
client, _ := NewE(context, kubeconfig, namespace)
return client
}
// Builder creates a resource builder
func (c *Client) builder(opt *BuilderOptions) *resource.Builder {
validator := c.validator
namespace := c.namespace
if opt == nil {
opt = NewBuilderOptions()
} else {
if opt.Validate != DefaultValidation {
validator, _ = c.factory.Validator(opt.Validate)
}
if opt.Namespace != "" {
namespace = opt.Namespace
}
}
b := c.factory.NewBuilder()
if opt.Unstructured {
b = b.Unstructured()
}
return b.
Schema(validator).
ContinueOnError().
NamespaceParam(namespace).DefaultNamespace()
}
// ResultForFilenameParam returns the builder results for the given list of files or URLs
func (c *Client) ResultForFilenameParam(filenames []string, opt *BuilderOptions) *Result {
filenameOptions := &resource.FilenameOptions{
Recursive: false,
Filenames: filenames,
}
return c.builder(opt).
FilenameParam(c.enforceNamespace, filenameOptions).
Flatten().
Do()
}
// ResultForReader returns the builder results for the given reader
func (c *Client) ResultForReader(r io.Reader, opt *BuilderOptions) *Result {
return c.builder(opt).
Stream(r, "").
Flatten().
Do()
}
// func (c *Client) ResultForName(opt *BuilderOptions, names ...string) *Result {
// return c.builder(opt).
// LabelSelectorParam(opt.LabelSelector).
// FieldSelectorParam(opt.FieldSelector).
// SelectAllParam(opt.All).
// AllNamespaces(opt.AllNamespaces).
// ResourceTypeOrNameArgs(false, names...).RequireObject(false).
// Flatten().
// Do()
// }
// ResultForContent returns the builder results for the given content
func (c *Client) ResultForContent(content []byte, opt *BuilderOptions) *Result {
b := bytes.NewBuffer(content)
return c.ResultForReader(b, opt)
}
func failedTo(action string, info *resource.Info, err error) error {
var resKind string
if info.Mapping != nil {
resKind = info.Mapping.GroupVersionKind.Kind + " "
}
return fmt.Errorf("cannot %s object Kind: %q, Name: %q, Namespace: %q. %s", action, resKind, info.Name, info.Namespace, err)
}
// IsReachable tests connectivity to the cluster
func (c *Client) IsReachable() error {
client, _ := c.factory.KubernetesClientSet()
_, err := client.ServerVersion()
if err != nil {
return fmt.Errorf("Kubernetes cluster unreachable")
}
return nil
}
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